2024-03-28T15:14:38Z
https://ejournal.undip.ac.id/index.php/index/oai
oai:ojs.ejournal.undip.ac.id:article/5261
2013-08-01T09:45:25Z
berkala_fisika:RA
RANCANG BANGUN SISTEM PENJERNIHAN DAN DEKONTAMINASI AIR SUNGAI BERBASIS BIOSAND FILTER DAN LAMPU ULTRAVIOLET
Endarko, Endarko
Putro, Triswantoro
Nuzula, Nike Iza
Armawati, Nuning
Wardana, Adi
Rubiyanto, Agus
Muntini, Melania S
Design and fabrication of appropriate technology (biosand filter) that is directly can beapplied for community has successfully been carried out for providing clean water. Thetechnology is adopted from slow sand filter method. Biosand filter that has been fabricated which is technology that is able to filter river water become clean water through filtration process from sand, gravel and an active carbon. For getting drinkable water from river water, biosand filter hasbeen combined with reverse osmosis system and ultraviolet disinfection. System of reverse osmosisand ultraviolet disinfection are used to reduce any bacteria, virus and total dissolved solids (TDS)from treated water which is resulted from biosand filter process. The results from Balai BesarLaboratorium Kesehatan Surabaya (BBLKS) has been declared that treated water from biosandfilter is met the test standards chemical and physical according to the regulation. Meanwhile theprocessed water from process through biosand filter, reverse osmosis and ultraviolet disinfectionis got predicate as drinkable water with met the test standards microbiological, chemical andphysical.Keywords: biosand filter, reverse osmosis, ultraviolet, drinking water
BERKALA FISIKA
2013-07-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5261
BERKALA FISIKA; Vol 16, No 3 (2013): Berkala Fisika; 75-84
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5261/4746
oai:ojs.ejournal.undip.ac.id:article/3037
2012-04-06T07:43:07Z
berkala_fisika:RA
Karakterisasi Dinamika Tingkat Tenaga Eksitasi 2Ag- Pada Karotenoid Spheroidene Menggunakan Spektroskopi Ultra Cepat Pisah Waktu
Novita, Mega
Mangimbulude, Jubhar
S. Rondonuwu, Ferdy
Poliena adalah rantai karbon dengan ikatan rangkap dan tunggal yang saling berutan. PPP-MRD-CI mempredikasikan bahwa rantai-rantai pendek poliena memiliki struktur energi dengan tingkatan 1Ag- > 2Ag- > 1Bu+. Waktu hidup tingkat tenaga eksitasi 2Ag- dan 1Bu+ pada poliena berada pada orde pikodetik – nanodetik tergantung pada panjang rantainya. Karotenoid sering dimodelkan sebagai rantai poliena dengan struktur energi yang sama. Paper ini membahas dinamika tingkat tenaga 2Ag- karotenoid spheroidene dalam pelarut n-hexane menggunakan spektroskopi ultra cepat pisah waktu. Didapati bahwa waktu hidup tingkat tenaga 2Ag- karotenoid spheroidene sekitar 9 pikodetik, dan sedikit bervariasi tergantung tingkat vibrasinya. Kata kunci: spheroidene, struktur energi, waktu hidup, spektroskopi
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3037
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus; C65-C68
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3037/2719
oai:ojs.ejournal.undip.ac.id:article/7385
2014-09-24T09:08:35Z
berkala_fisika:RA
PENDUGAAN LAPISAN RESERVOIR PANAS BUMI DI KAWASAN GUNUNGAPI SLAMET DENGAN MEMANFAATKAN DATA ANOMALI MEDAN GRAVITASI CITRA SATELIT
Reswara P.A., Ardhana
Sehah, Sehah
Estimation of the subsurface geological structures of Slamet Volcano area, Central Java, has been done by utilizing gravity field anomaly data of image of Geodetic Satellite (Geosat ) and European Remote Sensing-1 (ERS-1) satellite which has been corrected up to free air correction. This research aims to model the 2D profile of the subsurface geological structure which includes some layers of bedrocks, geothermal reservoir, magma chamber, and other geological structures. The procedure of data processing begins with bougeur and topographic corrections. The data obtained, then transformed to horizontal surface, filtered from the local anomalies effects, and corrected from the regional anomaly effect. The results obtained are in the form of residual gravity anomaly data. Modeling is done on the residual gravity anomaly data using 2 ½-D Talwani method packaged in Grav2DC for Window software. The modeling results show the subsurface geological structure of Slamet Volcano region consists of andesite magma with density value of 2.45 gram/cm3, old lava rock with density value of 2.9 gram/cm3, andesite rock with density of 2.54 gram/cm3, and andesitic – basaltic rock with density of 2.67 gram/cm3. Based on the research area geological information, strongly estimated that the geothermal reservoirs layers are in the andesite rock by filling in it pores or it fissures in the rock. Keywords: gravity field anomaly, modeling, geothermal reservoirs, Slamet Volcano.
BERKALA FISIKA
2014-04-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/7385
BERKALA FISIKA; 2014: Berkala Fisika Vol. 17 No. 2 Tahun 2014; 45-54
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/7385/6033
oai:ojs.ejournal.undip.ac.id:article/3054
2012-04-06T18:26:32Z
berkala_fisika:RA
Penentuan Tebal Bahan Transparan (ZnO) Menggunakan Interferometer Michelson
Edy Nugroho, Sulung
Firdausi, K. Sofjan
Marhaendrajaya, Indras
Thickness’ determination of ZnO material on a substrate (microscope slide) by using Michelson Interferometer has been carried out. The material used in the research was ZnO transparent material deposited on a 1 mm-thickness of a microscope slide. Refractive index of the microscope slide and the thickness of ZnO were measured by counting the fringes transitions as the materials rotated large as , on the other words, fringes transitions as function of sinus incident angles of laser ray, . Incident angles of laser ray, which are used in the measurement of ZnO transparent material thickness on microscope slide, are 1°, 2°, 3°, 4°, 5°, 6°, 7°, 8°, 9°, and 10°. Laser ray used in this research was He-Ne laser, which has 633 nm and its output power was < 1 mW. The results of this research show that there were fringes transitions as research-materials rotated large as . The measured fringes transitions still have remarkable agreement with the theoretical fringes transitions. As the incident angles increases, the fringes transitions will increase as well as. The thickness of the ZnO thin film, which is resulted from the research, is equal to (6.0 ± 1.8) × 10-5 m.
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3054
BERKALA FISIKA; Vol 10, No 3 (2007): Berkala Fisika; 105-110
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3054/2735
oai:ojs.ejournal.undip.ac.id:article/2884
2012-03-29T15:28:20Z
berkala_fisika:RA
Rancang Bangun Sistem Pengaturan Suhu Ruang Inkubator Bayi Berbasis Microcontroller AT89S51
Sugito, Heri
Suryono, Suryono
A room temperature adjustment system for infant incubator has created using electrical sources phase controlling. This device used to create environment temperature which is normal and stabile, as in mother’s uterus. The main component of room temperature of infant incubator adjustment which uses electrical sources phase controlling is 100 watt fluorescent hot source, temperature sensor LM 35, ADC 0804, microcontroller AT89S51, DAC 0808, Op-Amp LM 741, Phase detector (IC TCA 785), optical isolator (optocoupler), SCR, Pulse transformator, Coding 74LS47 and seven segment display. The temperature sensor, LM 35, perform data acquisition to room temperature of infant incubator. Furthermore, it strengthened and transformed by ADC 0804 to be digital data and read by microcontroller AT89S51. Reading value compared to accepted value, reading difference use for remove phase activator IC TCA 785 through DAC 0808. IC TCA as phase adjuster through trigger SCR TIC 106, it used to obtain temperature variation in heater lamp. The result is setting poin value with reading value have been as according with extinct indicator of lamp at infant incubator room. Keywords: infant incubator, temperature, phase control, microcontroller.
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2884
BERKALA FISIKA; Vol 12, No 2 (2009): Berkala Fisika; 55-62
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2884/2567
oai:ojs.ejournal.undip.ac.id:article/9380
2015-11-05T08:34:34Z
berkala_fisika:RA
STUDI KOMPARASI METODE PERCENTAGE DEPTH DOSE (PDD) DAN TISSUE PHANTOM RATIO (TPR) UNTUK MENENTUKAN INDEK KUALITAS BERKAS ENERGI 6 MV DAN 10 MV PADA PESAWAT LINAC
Laksono, Muharam Budi
Wardaya, Susila
Budi, Wahyu Setia
Hidayanto, Eko
PDD, TPR, photon and index beam quality.
Patient dose in the linac determined with source surface distance (SSD) technique using percentage depth dose (PDD) method and source axis distance (SAD) technique using tissue phantom ratio (TPR) method. Beam quality index is the concept of beam penetration in the water which can be quantized so get a measurable constant. In medical accelerator determined index beam quality using TPR20,10 to do with counting of PDD20,10 or PDD(10)Research has been carried out by comparing the method PDD and TPR to determine index beam quality of photon energy 6 MV and 10 MV on the linac. Measurements performed on the PDD method SSD 100 cm and TPR on the SAD 100 cm with standard field 10 cm x 10 cm. PDD and percent TPR pattern is similar to the built-up area, after dmax will be different. The results of index beam quality TPR20,10 photon energy 6 MV with a relative measurement 0.660416413 and absolute measurement 0.681884058 at 10 MV photon energies obtained relative measurement 0.73752495 and absolute measurement 0.72896543. Calculation TPR20,10 to PDD20,10 and TPR20,10 for PDD (10) of the relative and absolute measurement of the photon energy 6 MV and 10 MV obtained small deviations of less than 1%. Keywords: PDD, TPR, photon and index beam quality.
BERKALA FISIKA
2015-01-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9380
BERKALA FISIKA; 2015: Berkala Fisika Vol. 18 No. 1 Tahun 2015; 1-8
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9380/7563
oai:ojs.ejournal.undip.ac.id:article/3070
2012-04-07T08:50:30Z
berkala_fisika:RA
Review Probabilitas Menemukan Elektron dengan Fungsi Gelombang Simetri dan Antisimetri pada Molekul
Yusron, Moh.
Firdausi, K. Sofjan
Sumariyah, Sumariyah
The probability density of and for the symmetry and asymmetry wave function respectively, for ion has been simulated. The and wave function have been obtained through the solutions of one dimensional time-independent Schrödinger equation. The and are formed then by linear combination of individual solution of wave function of hydrogen atom. The probability density is calculated and simulated for several values of inter nuclear distance in Bohr radius, using Matlab 6.5. The interpretation of shows that the probability in finding the electron in the space between inter nuclear distance of 0,2 is very small for asymmetry and very large for symmetry wave function. If the inter nuclear distance is made larger in several , the probability becomes smaller. The probability density is just equal to individual in finding electron in a hydrogen atom. Key words: The probability density, symmetry and asymmetry wave function, the ion.
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3070
BERKALA FISIKA; Vol 10, No 1 (2007): Berkala Fisika; 7-12
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3070/2751
oai:ojs.ejournal.undip.ac.id:article/2713
2012-03-29T14:40:10Z
berkala_fisika:RA
Rancang Bangun Deteksi Alkohol Pada Urine Dengan Sensor TGS 2620 Berbasis Mikrokontroler AT89S51
Sutanto, Heri
Haryowati, Anggraeni Dwi
Arifin, Zainal
The design of alcohol detection in urine using sensors TGS 2620 microcontroller AT89S51 has been done. This device is made with a system that is simple and affordable prices so that it can be used for police and medical laboratories. Alcohol detection in urine is done by using sensors TGS 2620, ADC and the microcontroller. Measured values of the sensor are converted by the ADC and then processed microcontroller to be processed and sent to a computer with RS 232 modules. From the results of engineering manufacture alcohol detection devices in urine obtained test results showing that an increase in the value of sensor output voltage (VRL) at the time the sensor detects the presence of alcohol and research results of alcohol in urine is shown with captions positive or negative urine samples and the percentage content of alcohol . Keywords: Alcohol, Urine, Sensors TGS 2620, Microcontroller AT89S51.
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2713
BERKALA FISIKA; Vol 13, No 3 (2010): Berkala Fisika; 97-100
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2713/pdf
oai:ojs.ejournal.undip.ac.id:article/12801
2016-12-16T09:42:20Z
berkala_fisika:RA
SINTESIS LAPISAN TIPIS SENG OKSIDA DIDOPING PERAK (ZnO:Ag) DAN APLIKASINYA UNTUK PENDEGRADASI POLUTAN ORGANIK AIR
Sutanto, Heri
Nurhasanah, Iis
Hidayanto, Eko
Semiconductor, photo-catalyst, ZnO, doping Ag, micro-structure, photo-degradation
Zinc Oxide (ZnO) is a semiconductor material that is used for photo-catalyst to degrade organic pollutants. The addition of doping silver (Ag) in ZnO can increase the photo-catalytic activity in the degradation process. In this study, the addition of doping Ag in ZnO thin film on a glass substrate deposition using thermal spray coating method has influence on the micro-structure and photo-degradation in presence of bacteria Escherichia coli (E. coli) as an organic pollutants has been investigated. Micro-structure of ZnO : Ag layer were characterized by Scanning Electron Microscopy (SEM) and photo-degradation activities of bacteria were tested with Total Plate Counter (TPC). The results show that doping Ag in ZnO give affect the topography of the surface that can increase in amount of grains and grain size in order to increase the photo-catalytic activity. It indicated by decrease in amount of E. coli bacteria from the initial sample with percentage of degradation is 99,99951% Keywords: Semiconductor, photo-catalyst, ZnO, doping Ag, micro-structure, photo-degradation
BERKALA FISIKA
2015-10-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/12801
BERKALA FISIKA; 2015: Berkala Fisika Vol. 18 No. 4 Tahun 2015; 131-136
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/12801/9593
Copyright (c) 2016 BERKALA FISIKA
oai:ojs.ejournal.undip.ac.id:article/3087
2012-04-07T10:31:45Z
berkala_fisika:RA
Penentuan Kedalaman dan Ketebalan Akuifer Menggunakan Metode Seismik Bias (Studi Kasus Endapan Alluvial Daerah Sioux Park, Rapid Creek, South Dakota, United State of America)
Listiyani, Fenti
Nurwidyanto, M. Irham
Yulianto, Gatot
Data processing of refraction Seismic has been done by using the secondary data in area of Sioux Park, Rapid Creek, South Dakota, United State of America with the trajectory of seismic SP#1 which has geology structure of alluvial sediment. The sediment Alluvial has a form of water carrier rock precipitated by Rapid Creek Tthe data processing of refraction Seismic usedin this experiment is Reciprocal Hawkins methode that represent a method that develop concept of time depth recognition. The time Depth from the refractor is equal for the travel of critical time from the aspect of between refractor and surface less than time required for the ray path of projection of area refractor at a speed of refractor. Results of the seismic refracted obtained: first layer consist of clay functioning as covering laye, the second layer lapped over from clay, sand, and gravel functioning as carrier coat irrigate or coat acquife and the third layer lapped over from stone napal, functioning as waterproof coat ( impermeable). Deepness of layer acquifer vary from 0.93 ft - 12.01 ft ( 0.28 m – 3.66 m), and their thickness vary from 0.86 ft – 14.43 ft ( 0.26 m – 4.40 m). The geometry of these acquiferare in the form of free acquifer or unconfined aquifer. Keywords: seismic refraction, ground water
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3087
BERKALA FISIKA; Vol 9, No 3 (2006): Berkala Fisika; 109-113
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3087/pdf
oai:ojs.ejournal.undip.ac.id:article/2798
2012-03-29T12:02:12Z
berkala_fisika:RA
STUDY PENDAHULUAN SESAR OPAK DENGAN METODE GRAVITY (STUDY KASUS DAERAH SEKITAR KECAMATAN PLERET BANTUL)
Nurwidyanto, M Irham
Brotopuspito, Kirbani Sri
Waluyo, Waluyo
Sismanto, Sismanto
The reconnaissance research to predict the position and the type of Opak Fault in surrounding subdistrict Pleret area was carryout by gravity method. It done by measured the intensity of gravity field. The measurement was done in five lines cross the Opak Fault which indicated in the geological map. The intensity of gravity field in the surround of subdistrict Pleret area are measured by la-coste Romberg Gravitymeter, the latitude are measured by GPS Trimble, and the position are measured by GPS Garmin III Plus. The measurement was done in five lines which separated abaut 2,5 km and about 20 km in length. The distance of observations are about 0,5 km to 1 km. The data which be collected are reduction by drift and tidal correction, free air correction, bouger correction and terrain correction. The corrected data are made bouger anomaly contour. The result of this research by kwalitative interpretation are estimated that the location of Opak Fault in the eastern part of the position of Opak Fault which indicated in the geological map. The type of opak fault are normal fault, because can be detected by gravity method. Key words : Opak Fault, Pleret, gravity method.
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2798
BERKALA FISIKA; Vol 14, No 1 (2011): Berkala Fisika; 11-16
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2798/pdf
oai:ojs.ejournal.undip.ac.id:article/3103
2012-04-07T12:41:14Z
berkala_fisika:RA
Penentuan Dosis Gamma Pada Fasilitas Iradiasi Reaktor Kartini Setelah Shut Down
Prasetyowati, Risprapti
Azam, Much.
Firdausi, K. Sofjan
B. S., Edi Trijono
Determination of gamma dose after reactor shut-down around the kartini reactor core have beeb done. The measurement was done at the Lazy Susan (Rotary Rack) and outside the reflector wall which could be used as irradiation facility. Determination of gamma dose was carried out using wide range dosimeter consisting of a Geiger muller detector end a surveymeter. Detector was directed to outside wall reflector and lazy susan through the dry irradiation facility. Measurement was done after shut down for 3 hours with power of 100 kW and interval of ± 5 minutes. The resulting dose rate in reflector wall without neutron source was 1,2 to 0,2 kR/hour and cumulative dose in a 205 minute period was 2,21 kRad. In reflector wall with neutron source was 6 to 0,2 kR/hour and cumulative dose in a 202 minute period was 2,25 kRad. While in lazy Susan dose rate of 60 to 2 kR/hour and cumulative dose was 42,70 kRad in 203 minutes decay. Gamma decay constant in reflector wall without neutron source was 0,008 per minute, with neutron source 0,013 per minute. While in lazy Susan gamma decay constant was 0,014 per minute. Keywords : dose, gamm, core and reflector, reactor
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3103
BERKALA FISIKA; Vol 9, No 1 (2006): Berkala Fisika; 15-22
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3103/2784
oai:ojs.ejournal.undip.ac.id:article/2922
2012-03-30T14:32:27Z
berkala_fisika:RA
Aplikasi Transduser Ultrasonik Jenis Immersion Transducer Untuk Karakteristik Media Cair Dan Pengukuran Tingkat Kekasaran Permukaan Beton
Sugito, Heri
Suryono, Suryono
Layla, Diana
Research of the application of ultrasonics for liquid medium characteristic and measurement of level of surface roughness of concrete have been done using immersion transducer. This purpose of research is to know characteristic some dilutions based on the atanuasi coefficients and measure surface roughness of concretes based on time of flight. In this research applied by ultrasonic transducer with frequency of 1 MHz. At attenuation method, awakened ultrasonic signal through pulse generator and connected at transmitter transducer. Ultrasonic wave which transmitted through liquid medium will experience received finite attenuation of receiver. Media liquid which applied is oil and cooking oil. At method time-of-flight, measurement done with object scan which turned around counted 200 rotation apply motor stepper. Object which applied as component of test that is concrete. Reason of selec,choose it this specimen is to minimize attenuation so that will enlarge the bound. Transducer will transmit modulation to object through modulation transmiter and receiver. Result from scanner is presented at CRO ( Cathode Ray Oscilosco). Research result to liquid medium sample showing existence of tendency of increase of attenuation value for ex-oil- and ex-cooking oil if each compared with oil was new and new cooking oil. From measurement of level of surface roughness, obtained by is surface roughness average yield of concrete A ( Radium of a minimum of 10%, and Ra maximum 16%), and concrete B ( Radium of a minimum of 8%, and Ra maximum 17%). This research result give hope that this method can be developed for inspection innoxious at solid and liquid medium. keyword : Ultrasonic, attenuation coefficient, level of crudity, Time of Flight
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2922
BERKALA FISIKA; Vol 12, No 4 (2009): Berkala Fisika; 137-144
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2922/2610
oai:ojs.ejournal.undip.ac.id:article/4982
2013-05-27T14:18:20Z
berkala_fisika:RA
SIMULASI MONTE CARLO UNTUK MENENTUKAN DOSIS SINAR-X 6 MV PADA KETAKHOMOGENAN MEDIUM JARINGAN TUBUH
Rizani, Alfian
Setiabudi, Wahyu
Anam, Choirul
Study on dose distribution of human body at 6 MV X-ray beam has been done using Monte Carlo Simulation. This study is aimed to define dose distribution of soft tissues, lungs andbones also corrections factor due to tissue inhomogeneity.The study was conducted by Monte Carlo Simulation using EGSnrc software, i.e.BEAMnrc and DOSXYZnrc. The linear accelerator head was simulated by BEAMnrc with SSD100 cm and field size 10 x 10 cm . The calculating of radiation dose distribution at homogen andnonhomogen phantom that have size 40 x 40 x 40 cm in tissues of human body, such as softtissues, lungs and bones were made by using DOSXYZnrc. Nonhomogen phantom of human bodywas made by insert lungs or bones with thickness 10 cm in soft tissues at depth of 5 cm – 14 cm.It is obtained that the dose distribution of soft tissue and water phantom have samecharacteristic which both of them have maximum dose (D ) at depth of 1,5 cm. Inserting of lungswith a thickness of 10 cm in soft tissue results to the increasing of dose until 12,2 % and insertingof bones with the same thickness with lungs results to decreasing of dose until 10,3 %. The rangeof correction factor due to inserting lungs is 1,00–1,27 and for bone is 0,81–1,05.Keywords:Monte Carlo Simulation, PDD (Percentage Depth Dose), corrections factor
BERKALA FISIKA
2012-04-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4982
BERKALA FISIKA; Vol 15, No 2 (2012): Berkala Fisika; 49-56
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4982/4515
oai:ojs.ejournal.undip.ac.id:article/2971
2012-04-03T11:50:43Z
berkala_fisika:RA
Pengaruh Teknik Tegangan Tinggi Terhadap Entrasce Skin Exposure( ESE ) dan Laju Paparan Radiasi Hambur Pada Pemeriksaan Abdomen
Dhahryan, Dhahryan
Setia Budi, Wahyu
Azam, Much
The measurement for influence of high voltage technique to Entrance Skin Exposure and is Rate of Scattered Radiation Exposure on abdomen inspection has been conducted. The ESE measurement is conducted using Electrometer and is calculated by semi empirical method, while in measurement of rate of scattered radiation exposure using survey meter at a distance of 100 cm from the object by varying data intake points and its direction of detector. The result indicates that the usage of high voltage technique yields absorbent dose of 124 mrad and radiation exposure of 339 mR. It is lower than the standard value of absorbent dose of 322.7 mrad and radiation exposure of 130,5 mR. The result of measurement is higher than calculation. In measurement of exposure of scattered radiation rate with detector position faced to object, on right side of cathode, it yields 1.03mR/hour with standard voltage and 0.32 mR/hour with high voltage technique. While in measuring exposure of scattered radiation rate and back-scattered obtained result on A’ and C’ (close to anoda and side of object) and A” and C” nearly same, with highest value of 1 mR/hour and 0.93 mR/hour at standard tube voltage and at high kV technique obtained lower value of 0.29mR/hour and 0.25mR/hour.
BERKALA FISIKA
2012-03-30
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2971
BERKALA FISIKA; Vol 11, No 3 (2008): Berkala Fisika; 103-108
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2971/2657
oai:ojs.ejournal.undip.ac.id:article/5001
2013-05-27T15:53:10Z
berkala_fisika:RA
UPAYA PENINGKATAN KUALITAS CITRA MRI DENGAN PEMBERIAN MEDIA KONTRAS
Suhardi, Suhardi
Setiabudi, Wahyu
Anam, Choirul
Improvement the image quality of magnetic resonance imaging (MRI) carried out bycontrast media has been done. It was expected to obtain a better image quality so thatinterpretation of MRI images more valid. Contrast media were used gadolinium 5 mmol/10 ml perpatient. Number of patients 10 people with tumor of the head, and each uses a 6 slices. MRI usedAIRIS II with 0.3 Tesla magnetic field, Kodak Dry View 8900, densitometry, and Film. In thisstudy, the image resulted with and without contrast media were measured its density andcompared. It was resulted that the image density in normal tissues no change, with and withoutcontrast media. While the tumor area with and without contrast media, the density decreased byan average of 0,56. The addition of contrast media, the presence of tumor will appear moreclearly.Keywords: Contrast Media, gadolinium, MRI
BERKALA FISIKA
2013-01-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5001
BERKALA FISIKA; Vol 16, No 1 (2013): Berkala Fisika; 9-14
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5001/4534
oai:ojs.ejournal.undip.ac.id:article/2997
2012-04-04T07:34:54Z
berkala_fisika:RA
Studi Awal Pemodelan Perlakuan Virotherapy Yang Menggunakan Virus Campak Pada Tumor Paru-Paru Tikus
Kartono, Agus
Sunjono, Sunjono
Arif, Ardian
The interaction model dynamics between tumor and viruses based on the interaction phenomenon between the three populations, namely: population of uninfected tumor cells, tumor cell population infected with the virus and the virus population. This study aimed to see the interaction between non-infected tumor cells, tumor cells infected with viruses and viruses, so it can be modeled using virotherapy treatment of measles virus in mouse lung tumors. Model parameters obtained from experimental data. Numerical Solution of the models suggest that the dose of the virus play an important role in determining the outcome of tumor therapy. Tumor growth can be slowed by using this virotherapy, but the tumor can not be killed as a whole. Keywords: model dynamics, virotherapy, measles virus, mouse lung tumors
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2997
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus; A13-A22
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2997/2681
oai:ojs.ejournal.undip.ac.id:article/5214
2013-07-30T08:53:03Z
berkala_fisika:RA
PERHITUNGAN ANALITIK PEMECAHAN SPIN RASHBA PADA QUANTUM DOT GaAs DALAM POTENSIAL PARABOLIK DUA DIMENSI
Tri Cahyanto, Wahyu
Hidayanto, Eko
Analytical calculation of Rashba spin-splitting on the GaAs-based quantum dots in the twodimensionalparabolic confinement. It has been investigated the spin splitting due to the Zeeman effectand a Rashba-type spin-orbit coupling on a disk-like GaAs-based quantum dot. Calculations weredone analytically considering the influence of an external magnetic field applied perpendicularly tothe dot. The result shows that spin-orbit interaction causes a “crossing” on the electron energy statesin the dot with the same angular momentum and different spin polarizations in a nonzero magneticfield. The calculated magnitudes of spin splitting and magnetic fields at the crossing level can be usedto discuss more realistic quantum dots model theoretically on the further research.Keywords: Rashba spin-orbit coupling, GaAs-based quantum dots, crossing levels
BERKALA FISIKA
2013-04-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5214
BERKALA FISIKA; Vol 16, No 2 (2013): Berkala Fisika; 47-52
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5214/4714
oai:ojs.ejournal.undip.ac.id:article/3031
2012-04-05T15:02:53Z
berkala_fisika:RA
Analisis Korelasi Kondisi Pembuatan Film Tipis Polipropilen (PP) dan Sifat-Sifat Mekaniknya Dengan Metode Uji Tarik
Sari, Kartika
Satoto, Rahmat
Condition Correlation Analysis of Thin Film Polypropylene (PP) and Attributes Mechanical Tensile Testing Method has been performed in Polymer Test Lab located at LIPI Bandung. This study aims to examine the relationship between the manufacture of thin film with a three-siftat sisitem cooling and mechanical properties. Sample material used is Polypropylene (PP) Y101XX grain pellets. Then the material is arranged on the aluminum frame of the heating plate and plastic transparencies of six samples. Such materials will be heated with two variations of temperature at the same time given the pressure by using the hot press Gonno-02 326 at 175oC and 225oC and given three different treatment when the cooling process that is in the chill with ice water (quenching), in the chill on cold press and cooled until it reaches room temperature by turning off the heater. Samples that have formed a thin film forming dipotopng Dumbbell type ISO 527-2. Of the six films produced by two samples with different cooling systems made seven Dumbbell. Then Dumbbell-dumbbell was conducted testing of mechanical properties by measuring the strain, stress and elastic modulus using a tensile test using a Universal Tensile Tester. Keywords: Polypropylene (PP), Thin Film, Universal Tensile Tester
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3031
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus; C27-C38
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3031/2714
oai:ojs.ejournal.undip.ac.id:article/6576
2014-03-21T15:22:43Z
berkala_fisika:RA
Perancangan Model Pengukuran Jarak Menggunakan Computer-Aided pada Kontrol Kualitas Ultrasonografi
Fallo, Frida
Adi, Kusworo
Suryono, Suryono
This research purposes are to do some quality tests through a distance measuring calculation using computer-aided system in a USG image projection and to analyze the distance measuring. In concerning with the design and its implementation, this research used digital tabulation method of image projection to compute and to analyze the distance measuring. The image value was established by variation of attenuation, TGC, and depth. Image tabulation was processed with ROI establishing and the cropping method. In depth variation, the average real distance of USG image resolution is 1 cm, the average value of vertical distance accuration of the image is 0.9747, thus the error value of the vertical distance accuration is 0.0253 cm or 0.253 mm or 0.253 % from the real distance and the average value of the horizontal distance accuration of the image is 0.998 cm thus the error value of the horizontal distance accuration is 2x10-3 cm or 0.02 mm or 0.02 % from the real distance. For the variation of attenuation, the average value of vertical distance accuration of the image is 0.967 thus the error value of the vertical distance is 0.033 cm 0.33 mm or 0.33 %, and the average value of the horizontal distance accuration of the image is 0.986 cm thus the error value of the horizontal distance is 0.014 cm 0r 0.14 mm or 0.14 %. Thus the error value for the vertical distance accuration is 0.031 cm or 0.31 mm or 0.31 % from the real distance. The result of the all tested components showed that the tested USG machine fullfiled the qualification of The American Association of Physicists in Medicine (AAPM) criteria. Keywords : USG, Quality Control, Distance Accuration, Computer-Aided
BERKALA FISIKA
2014-01-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/6576
BERKALA FISIKA; 2014: Berkala Fisika Vol. 17 No. 1 Tahun 2014; 13-20
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/6576/5410
oai:ojs.ejournal.undip.ac.id:article/3049
2012-04-06T20:08:09Z
berkala_fisika:RA
Pengukuran Nilai dan Larutan Gliserin Terimbas pada Frekuensi PLN
Firdausi, K. Sofjan
Lego, Dro Dwi
Sugito, Heri
The magnetooptical specific rotary power h and frequence specific rotary power z have been measured in the glycerine through the interaction between external magnetic field modulated at 50-60 Hz and modulated laser light at the wavelength of 632,8 nm and 532 nm. The sample induced by the magnetic field that has the maximum value of 170 mT. The source of light of 632,8 nm and 532 nm is modulated between 30 Hz and 100 Hz. The result of experiment indicates that values of h and z at l = 632,8 nm are more dominant than at l = 532 nm. Key words: magnetooptic, specific rotary power, resonance frequency
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3049
BERKALA FISIKA; Vol 10, No 4 (2007): Berkala Fisika; 175-177
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3049/2730
oai:ojs.ejournal.undip.ac.id:article/9294
2015-10-19T16:14:22Z
berkala_fisika:RA
PROTOTYPE GENERATOR MAGNET PERMANEN MENGGUNAKAN KUMPARAN STATOR GANDA
Hartono, Hartono
Sugito, Sugito
Wihantoro, Wihantoro
A permanent magnet generator has had been built using double stator coil. Such coil was used to increase the electrical energy produced. This is apparently a type of single phase generator equipped by four permanent magnets of 2.5 cm in diameter and length each. Each of the four magnets has 4000 Gauss magnetic strength. The coil itself made from email wire of 0.12 mm in diameter and has 1200 turns. The performance of generator was tested on a rotor that turn by 300, 600, 900 and 1200 rpms each. The testing was performed on a condition with and without any load resistance. Testing result without load resistance showed the increase average output voltage about 83.95%, where the generator with load resistance has increase average output voltage about 62.65%.Keywords: generator, permanent magnet, double stator, increase the electrical energy
BERKALA FISIKA
2014-10-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9294
BERKALA FISIKA; 2014: Berkala Fisika Vol. 17 No. 4 Tahun 2014; 115-120
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9294/7506
oai:ojs.ejournal.undip.ac.id:article/3065
2012-04-07T08:46:43Z
berkala_fisika:RA
ANALISIS GUGUS FUNGSI PADA SAMPEL UJI, BENSIN DAN SPIRITUS MENGGUNAKAN METODE SPEKTROSKOPI FTIR
Anam, Choirul
Sirojudin, Sirojudin
Firdausi, K. Sofjan
An analysis of functional groups using FTIR (Fourier Transform Infra Red) spectroscopy in test samples, such as petroleum and spiritus compound has been done.The spectral of the functional groups is observed by comparing of the absorption band which is formed on infra red spectrum with the infra red lines standard and comparing with other known compound. It is expected that functional group identification can be done effectively.Infra red spectrums of petroleum show the group of methyl (CH3), alkenes and aromatic compound. That results analysis is supported by appearance of bending symmetric vibration of C-H and the presence of stretching vibration of C=C from aromatic ring. The spiritus spectrums show the group of hydroxyl from alcohol compound. That analysis is supported by appearance of wide band on 3500–3000 cm-1 and appearance of band on 1000–1100 cm-1. While test sample spectrum show the group of hidroksil (O-H) from primary alcohol, group of metil (CH3), triple bond (C≡C–H), group of nitril (R–C≡N), double bond (C=C) and C-N. Keyword: FTIR spectroscopy, vibration, infra red spectrum, absorption, functional group
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3065
BERKALA FISIKA; Vol 10, No 2 (2007): Berkala Fisika; 79-85
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3065/2746
oai:ojs.ejournal.undip.ac.id:article/2705
2012-03-29T15:32:53Z
berkala_fisika:RA
Mikrostruktur Semikonduktor GaN di Atas Substrat Silikon Dengan Metode Sol-Gel
Sutanto, Heri
Nurhasanah, Iis
Istadi, Istadi
Maryanto, Maryanto
Ambikawati, Wahyu
Marlini, Nofi
Gallium nitride (GaN) semiconductor thin films have been successfully deposited on Si substrate (004) by sol-gel method. Gel prepared from the crystal gallium-citrate-amines. These crystals formed from a solution containing the ions Ga+3 and citric acid (CA). Gel in place on the substrate and then rotated with a speed of 1100 rpm. The gel layers are obtained and then placed on the programmable furnace. Deposition temperature varied of 800, 900 and 1000oC in a nitrogen gas environment during 2 hour. The crystal quality of GaN thin films have characterized by XRD measurement. The surface morphology and cross section of the films observed by SEM. The film compositions determined by EDX characterization. The results showed that all the GaN thin films on silicon substrate have oriented polycrystalline structure. The crystal quality of GaN film is formed is influenced by the deposition temperature. In a deposition temperature range is used, increasing the deposition temperature can improve the crystal quality of GaN films. Keywords: GaN Thin Films; Spin-Coating Technique; Silicon Substrate
BERKALA FISIKA
2012-03-28
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2705
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika; 55-60
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2705/pdf
oai:ojs.ejournal.undip.ac.id:article/10835
2016-04-21T12:16:26Z
berkala_fisika:RA
STUDI PARAMETER REAKTOR BERBAHAN BAKAR UO2 DENGAN MODERATOR H2O DAN PENDINGIN H2O
Richardina, Very
Budi, Wahyu Setia
Tjiptono, Tri Wulan
PWR, reactor parameters, effective multiplication factor (keff), WIMSD5B
Research about study of Pressurized Water Reactor (PWR) parameters using UO2 as fuel materials with moderator of H2O and coolant of H2O for heterogeneous infinite cylinder design has realized. There is one of design to make nuclear reactor, it is a neutronic design. At neutronic design, first must calculations to determine group constants ( neutron cross section and the multiplication factor). The neutronic equations with one dimensional transport theory for annulus geometry can be solved with WIMSD5B codes. Numeric method that used was one dimensional homogenization cell methods. To archieve steady state or reactor, used enrichment of U235 between 2% until 3,2% with variation 0,05%. From the result with cluster methods with 32 groups and 10 regions, steady states of reactor at enrichment of U235 is 2,9% with effective multiplication factor (keff) = 1,006491. Keywords: PWR, reactor parameters, effective multiplication factor (keff), WIMSD5B
BERKALA FISIKA
2015-07-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/10835
BERKALA FISIKA; 2015: Berkala Fisika Vol. 18 No. 3 Tahun 2015; 95-100
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/10835/8570
oai:ojs.ejournal.undip.ac.id:article/3081
2012-04-07T12:32:22Z
berkala_fisika:RA
Pengaruh Ukuran Butir Terhadap Porositas dan Permeabilitas pada Batupasir
Nurwidyanto, M. Irham
Yustiana, Meida
Widada, Sugeng
It has been done a research to know the influence of grain size to permeabiality and porosity on sandstones from Ngrayong Formation, Ledok Formation, Kerek Formation and Selorejo Formation. The Permeability is measured by RUSKA Permeameter Gas, while the porosity is measured by Porosimeter Gas A-9756 series. The grain size is then determined using grain size analysis method. After the calculation, the grain size is attributed to permeability and porosity of sandstones with the analysis regresi method. Results obtained indicate that the influence of grain size significant at six sandstones. Based on the statistic calculation it has been obtained the relation with Linear regression equation Log k= -5.7 Log d + 15 with r2=0.7, for the grain size to permeability and = -1.9x102d +75 with r2=0.7, for the relation of grain size to porosity. Key Word: sandstone, grain size, porosity, permeability
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3081
BERKALA FISIKA; Vol 9, No 4 (2006): Berkala Fisika; 191-195
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3081/2762
oai:ojs.ejournal.undip.ac.id:article/2816
2012-03-29T15:40:30Z
berkala_fisika:RA
Respon Berbagai Bentuk, Ukuran dan Bahan Elektroda Pada Pengayaan Elektrolisis Tritium dalam Sampel Air
Hidayanto, Eko
Tjahaja, Poppy Intan
Arif, Idam
Experiments were carried out to investigate the effects of various forms, sizes and materials of electrodes in the electrolytic enrichment for the determination of tritium concentration in water sample. Electrodes were made in several forms: square plate, cylinder and spiral. The electrolytic enrichment was carried out by conducting electric current to the electrodes in electrolytic cell at 150C filled with water sample, until the water volume is reduced to 10% from the initial volume. The concentrated water were then mixed with scintillate solution, and then counted using Liquid Scintillation Counter (LSC). The results show that the appropriate electrodes is nickel square plate with the recovery fraction and the enrichment factor respectively are 73.73% and 7.373
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2816
BERKALA FISIKA; Vol 12, No 3 (2009): Berkala Fisika; 85-92
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2816/pdf
oai:ojs.ejournal.undip.ac.id:article/23833
2019-06-25T13:48:03Z
berkala_fisika:RA
RANCANG BANGUN SISTEM PENGENDALI TEMPERATUR DENGAN PROPORSIONAL, INTEGRAL DAN DIFERENSIAL (PID) BERBASIS MIKROKONTROLER ARDUINO UNO
Noviyani, Siti
Sumariyah, Sumariyah
PID, temperature, Ziegler-Nichols method, Arduino Uno
The aim of this research was to realize a design of a temperature control system with the proportional-integral-differential (PID) based on the Arduino Uno microcontroller, and toanalyz e the PID to the system. The PID control method was designed by identifying plants using the Ziegler-Nichols method to determine PID parameters consisting of proportional constant (Kp), integral constant (Ti), and differential determination constant (Td). Hardware design consisted of the Arduino Uno microcontroller which is open source with PID and pulse width modulation (PWM), and it can be control with feedback in the form of temperature sensors, AC lamp generators, and AC dimmer lamps. The system was implemented using C language with Arduino IDE software. The system can be done at the best stability point with a value of Kp = 0.015, Ti = 101.52, Td = 25.38. The three parameters have their respective functions, i.e. Kp is used to small error detector, Ti is to back-up system in order to work around the set-point, and Td is to speed up the system rate.Keywords: PID, temperature, Ziegler-Nichols method, Arduino Uno
BERKALA FISIKA
2019-06-24
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/23833
BERKALA FISIKA; Vol 22, No 2 (2019): Berkala Fisika Vol. 22 No. 2 Tahun 2019; 62-67
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/23833/15379
Copyright (c) 2019 BERKALA FISIKA
oai:ojs.ejournal.undip.ac.id:article/3098
2012-04-07T12:39:15Z
berkala_fisika:RA
STUDI SIFAT ELEKTROOPTIS PADA KACA AKUARIUM, KACA PREPARAT, DAN AKRILIK
Nila Kusuma, Anis
Firdausi, K. Sofjan
Setia Budi, Wahyu
The properties of electrooptics of transparency media such as aquarium glass, micro slides, and acrylic have been studied. To obtained the change of refractive index (Dn) of materials against external static electric field (E), the samples are placed in two parallel plates applied by potential different of 0 – 104 V. The maximum external field reached by this experiment is in order 106 V/m. The change of refractive index as function of E is measured by Michelson interferometer equipment. First, our results show that the refractive index decreases as E increases for all samples. Second, Dn varies slightly square to E, which is still the dominant of linear electrooptic coefficient. The graphs both of acrylic and slides are rather smooth, which indicates that the crystal structures are more regular than aquarium glass. Key Words: electrooptics, refractive index, static electric field
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3098
BERKALA FISIKA; Vol 9, No 2 (2006): Berkala Fisika; 81-84
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3098/2779
oai:ojs.ejournal.undip.ac.id:article/2895
2012-03-29T15:40:30Z
berkala_fisika:RA
Aplikasi Plasma Lucutan Berpenghalang Dielektrik pada Peningkatan Kualitas Air dengan Mengalirkan Air secara Langsung dalam Reaktor Berkonfigurasi Elektroda Spiral-Silinder
Muhlisin, Zaenul
Oktiyana, Wulandary
Nur, Muhammad
A dielectric barrier discharge plasma reactor has been realized and characterized with air source as a working gas. Ozone and dissolved ozone concentration were measured at various voltages (4 to 8 kV), treatment time ( 1 to 5 minutes), water flow rate 4.167 l/min and different air flow rates (1.5 and 2.5 l/min). And the other hand, for understand the ability of ozone to improve water quality, dissolved oxygen has been measured at various voltage (3.6 to 5.2 kV) and after treatment time (until 90 minutes). Spiral electrode is made by copper wire with circumference length 500 mm and diameters 1 mm, while cylindrical electrode is made from aluminum foil with 450 mm in length. Aluminum foil is stuck at inner wall of PVC tube with 500 mm in length and diameter 1.25 inch. Pyrex is used as dielectric material, with length 500 mm, inner diameter 10 mm and thickness 1 mm The result show ozone is produced have maximum concentration 15.613 ppm and dissolved ozone have maximum concentration 10.305 ppm. As a whole ozone concentration higher than dissolved ozone concentration. Both of ozone and dissolved ozone concentration increases by increase of the voltage applied, increases by increase treatment time and increases by decrease of the gas flow rate inside the reactor. Command dissolved oxygen increases with the increase of the high voltage applied and increases after dissociation ozone in water. Key Words : spiral cylindrical electrode, dielectric barrier discharge, the ozone concentration, the dissolved ozone concentration, dissolved oxygen
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2895
BERKALA FISIKA; Vol 12, No 3 (2009): Berkala Fisika; 99-106
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2895/2578
oai:ojs.ejournal.undip.ac.id:article/4977
2013-05-27T11:13:22Z
berkala_fisika:RA
APLIKASI METODE GEOLISTRIK TAHANAN JENIS UNTUK MENENTUKAN ZONA INTRUSI AIR LAUT DI KECAMATAN GENUK SEMARANG
Nisa, Khoirun
Yulianto, Tony
Widada, Sugeng
An interpretation has been conducted to the salt water spreading in the district of Semarang city Genuk area by the geoelectrical method of resistivity using Schlumberger electrode configuration.Acquisition of field data were processed using Ip2win program whose results are used to describe the resistivity cross-section area of research. Resistivity cross-section was combined with thedistribution of groundwater sanility from electrical conductivity value approach to determine thezoning of sea water intrusion in the study area.Zone of sea water intrusion in the district of Semarang city Genuk are consist regionKarangroto and Sembungharjo starting from a depth of 80 meters, Bangetayu west starting from adepth of 100 meters, 140 meters depth Genuksari start, and Trimulyo ranging from a depth of 200meters with values of electrical conductivity 16.550 Ωm.Key Words : Geo-electrical, sea water intrusion
BERKALA FISIKA
2012-01-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4977
BERKALA FISIKA; Vol 15, No 1 (2012): Berkala Fisika; 7-14
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4977/4510
oai:ojs.ejournal.undip.ac.id:article/2935
2012-03-30T15:03:20Z
berkala_fisika:RA
OPTIMASI SHIELDING NEUTRON PADA THERMALIZING COLUMN REAKTOR KARTINI
Nurlaili, Fidayati
Azam, M.
Firduasi, K. Sofjan
Widarto, Widarto
Shield optimization and the calculation of neutron flux the coming out of the thermalizing column of the Kartini reactor have been conducted.The neutron flux will decrease exponentially as it passes the thermalizing column. The thermalizing column of Kartini reactor consists of many different kinds of shields, i.e, graphite, lead, paraffin and an empty chamber of air, therefore the neutron flux count that is coming out of the thermalizing column can be calculated and the shields within the column can be optimized to give smaller neutron flux.Calculation result indicates that the neutron flux coming out of the thermalizing column is 2,681×10-11 cacah cm-2s-1. After optimization, the remaining flux coming out of the thermalizing column is 1,042×10-28cacah cm-2s-1. Key words: thermalizing column, Shield, neutron flux
BERKALA FISIKA
2012-03-30
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2935
BERKALA FISIKA; Vol 11, No 4 (2008): Berkala Fisika; 119-125
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2935/2623
oai:ojs.ejournal.undip.ac.id:article/4995
2013-05-27T16:00:41Z
berkala_fisika:RA
ANALYTICAL MODELING OF NON PLANAR MOSFET
Endro Suseno, Jatmiko
The Non Planar MOSFET structure with curved-channel is one alternative MOSFET structure for enhance the electrical performance. The study was focused on the non planar deviceswhich has curved-channel including grooved-gate, recessed-channel, V-shaped and sidewallvertical MOSFET. The presence of corner region can effective in reducing the electric field at thedrain, thus improving reliability of short channel effects (SCEs). The corner effect can reducesurface potential. It can improve the characteristic of the device electrical performance, especiallythe reduction of short channel effect and hot carrier effects. Therefore, the curved-channelMOSFET has a very great application prospect in deep submicron device architecture.Keywords: MOSFET, Non Planar, curve channel, surface potential, short channel effects
BERKALA FISIKA
2012-10-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4995
BERKALA FISIKA; Vol 15, No 4 (2012): Berkala Fisika; 113-118
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4995/4528
oai:ojs.ejournal.undip.ac.id:article/2992
2012-04-03T15:26:30Z
berkala_fisika:RA
Studi Efek Kerr Untuk Pengujian Tingkat Kemurnian Aquades, Air PAM dan Air Sumur
Sukarsono, Kristantyo
Marhaendrajaya, Indras
Firduasi, K. Sofjan
In this research was discussed about the ratio of purity level of aquades, running water, and well water by using the Kerr effect. Several substances being used are sugar solutions with the concentration of 10%, 20%, 30%, 40% and 50% for linearity testing, salt solutions with the concentration of 10%, 30% and 50% for the testing of ionic response which be infested by some dipoles of H2O molecules in the salt solution toward the external electrical field, and also aquades, running water and well water as the water samples having the different purity. The external electrical field being given in the substances from zero to 9×105 V/m and awakened by conducting the direct current of electric on the parallel plates. A light beam being used is a diode laser with λ = 645 nm. The result of research was showing that the presence of external electrical field causing the difference of polarization angle indicating the purity level of water kinds since influenced by ions in the water. Based on the ions containing in it have been known that the value of aquades purity is 4 ppm, the value of running water purity is 108 ppm and the value of well water purity is 190 ppm. So, aquades is purer than running water and running water is purer than well water. The average value of polarization angle of aquades, running water, and well water is approximately 0,50º, 0.25º and -0,25º respectively. Key words: Kerr Effect, electrical field, polarization angle
BERKALA FISIKA
2012-04-03
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2992
BERKALA FISIKA; Vol 11, No 1 (2008): Berkala Fisika; 9-18
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2992/2676
oai:ojs.ejournal.undip.ac.id:article/5008
2013-05-27T16:22:30Z
berkala_fisika:RA
INVERSI IMPEDANSI ELASTIK UNTUK MENGESTIMASI KANDUNGAN RESERVOIR BATUPASIR LAPANGAN “Ve” FORMASI CIBULAKAN CEKUNGAN JAWA BARAT UTARA
Aisyah, Veratania
Harmoko, Udi
Mualimin, Mualimin
An Elastic Impedance inversion was carried out to determine sandstone reservoir characterization of “Ve” Field Cibulakan Formation, Northwest Java Basin. There are many steps of data processing to analize a well log data in order to get sensitive angle of lithologic characterization. Mudrock Line equation was applied to obtain Vs log data of the research target zone. The next step, we did Well seismic tie toobtain horizon that approach the real geological zone. Initial model was made by used a control well andDST 5 horizon. Sparse Spike inversion gives the most accurate result than two other one. According to thevolume inversion, we plotted to a map show the contrast of sandstone lithology. Based on Elastic Impedanceinversion analysis, we estimate the rangeof sandstone reservoir impedance:1348 (m/s)gr/cc – 1365(m/s)2gr/cc. Crossplot analysis result between log Elastic Impedance and log Gamma Ray shows that 35isthe best angle of the sandstone and shale lithologic sparation.Keyword: Elastic Impedance, AVO, inversion, Mudrock Lin
BERKALA FISIKA
2011-07-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5008
BERKALA FISIKA; Vol 14, No 3 (2011): Berkala Fisika; 87-92
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5008/4541
oai:ojs.ejournal.undip.ac.id:article/3003
2012-04-04T07:38:31Z
berkala_fisika:RA
Arus Terobosan Pada Transistor Dwikutub Struktur Hetero Si/Si1-xGex/Si Anisotropik Melewati Basis Tergradasi (Graded Base)
Hasanah, Lilik
Khairurrijal, Khairurrijal
Tunneling current in bipolar transistors Si/Si1-xGex/Si anisotropic hetero structure for germanium conditions on a constant basis is not analyzed here. The concentration of germanium in the base which is not constant will result in the potential profile at the base is not flat, but will be graded according to the germanium concentration. Tunneling current calculation is performed semi-analytically and numerically. The calculation result obtained then matched with experimental data. The results show that the results of analytical calculations with results of semi-numerical calculations. While analytical calculations with experimental data only flows from the VBE 0.3 to 0.6 V. Keywords: Tunneling current, germanium concentration, anisotropic material, transfer matrix method, hetero structure bipolar transistor
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3003
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus; B39-B44
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3003/2687
oai:ojs.ejournal.undip.ac.id:article/6179
2014-02-10T09:36:57Z
berkala_fisika:RA
IDENTIFIKASI TELUR AYAM DARI INDUK MUDA DAN TUA MENGGUNAKAN SPEKTROSKOPI INFRAMERAH DEKAT
Amalia, Riana
Trihandaru, Suryasatriya
Rondonuwu, Ferdy S
One important factor in the hatching chicken eggs industry is hatchability of the eggs. Conventionally, hatchability of the eggs is determined by the age of the hen. It is estimated thateggs which have high hatchability will produced from the hen which is aged between 25 to 55weeks. However, the age of the eggs hen is difficult to recognize from the egg itself, in particular ifthe identification needs to be done quickly and involving eggs in large quantities. This paperreports the identification of chicken egg from young and old hen using Near Infrared Spectroscopy(NIRS), followed by Principal Component Analysis (PCA). A total of 120 eggs with the amount of 60 eggs that was taken from young hen (aged around 26 weeks) and the remaining 60 eggs thatwas taken from old hen (aged arround 66 weeks) can be clearly distinguished by clusteringthrough PC1-PC2 diagram. Thus, this method can be used to identify chicken eggs based on agehen.Keywords : Chicken Eggs, NIRS, PCA.
BERKALA FISIKA
2013-10-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/6179
BERKALA FISIKA; Vol 16, No 4 (2013): Berkala Fisika; 125-130
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/6179/5235
oai:ojs.ejournal.undip.ac.id:article/3043
2012-04-07T12:47:49Z
berkala_fisika:RA
Penerapan Pendekatan Modified Free Inquiry Sebagai Upaya Meningkatkan Kreativitas Mahasiswa Calon Guru Dalam Mengembangkan Jenis Eksperimen Dan Pemahaman Terhadap Materi Fisika
Khanafiyah, Siti
Rusilowati, Ani
This study aimed to enhance students' creativity in developing the kinds of experiments and understanding of materials physics, especially wave, with application of the modified approach to free inquiry in the department of Physics, State UNNES. The instrument used a questionnaire to measure creativity, observation sheet to measure the ability psikhomotorik and sheets test to measure the understanding of matter waves. Results were analyzed using a Likert scale questionnaire. Normalized gain formula is used to test the effectiveness of modified free inquiry approach in enhancing students' creativity and understanding of the matter wave. The results showed that the application of modified free inquiry approach that gives freedom to the students to develop creativity, to (1) improve the ability psikhomotorik students, (2) type of experiment, developed into more varied, (3) enhance student creativity, and (4) increase cognitive abilities of students. Keywords: modified free inquiry, creativity
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3043
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus; E7-E14
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3043/2725
oai:ojs.ejournal.undip.ac.id:article/8878
2015-08-01T18:11:16Z
berkala_fisika:RA
DETEKSI DINI KUALITAS MINYAK GORENG DAN STUDI AWAL TINGKAT KEHALALANNYA MENGGUNAKAN POLARISASI ALAMI
Eva, Yulianti
Indriyani, Y
Husna, A
Putri, N Kharisma
Murni, Sri
Amitasari, Ria
Putranto, Ari Bawono
Sugito, Heri
Firdausi, K Sofjan
In this paper, we investigate natural light polarization for preliminary test of quality and authentication (halal) level of frying oil. Recently standard methods used are usually based on Indonesian National Standard (SNI), however all parameters are very difficult to be determined simultaneously. On the other hands even the test is time consumed, inexpensive, complicated and also preliminary treatments required, which is a major problem in era of rapid information need. One of an alternative solution is to use natural light polarization method. In the experiment, several vegetable frying oils and animal oils are used to be tested. The change of polarization angle is used to indicate the level of oil quality and its authentication. The result shows that higher polarization indicates lower oil quality relative to the others, which is in agreement to the previous study. This method is, not only, able to differentiate various edible vegetable oils, but also to distinguish edible oils and expired oils. More over, it has a prospect to indicate an authentication of oil that is a subject of a halal or not-halal case.This method is relative simply, not time consumed, conducted accurately without any previous treatments, and it provides a good prospect as a preliminary test for oil quality and its authentication. Keywords: Natural polarization, oil quality, halal or authentication level
BERKALA FISIKA
2014-07-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/8878
BERKALA FISIKA; 2014: Berkala Fisika Vol. 17 No. 3 Tahun 2014; 79-84
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/8878/7213
oai:ojs.ejournal.undip.ac.id:article/3060
2012-04-07T08:43:45Z
berkala_fisika:RA
Rancang Bangun Sistem Pengukur Konsentrasi Larutan Tembaga Sulfat (CuSO4) Menggunakan Komputer
Sumariyah, Sumariyah
Endro Suseno, Jatmiko
L, Fitria
A system of Sulphate Copper (CuSO4) liquid consentration measurement by using compute has been made. The display of it through monitor in the computer with the limitation of measurement 0.1 M to 1M. The main components of the measure system of Sulphate Copper (CuSO4) liquid consentration are : tungsten filamen light which include in the sample and photodioda light sensor also IC 741 as a Operational Amplyfier to strengthen the tension of sensor output. As the chage of the output analog signal power tobe digital signal ADC 0809 is used. And also as an interfce which is the pheripheral instrument of communication equipment with computer is used PPI 8255. The software on this measure system uses Turbo Pascal version 7.0. This system had been realized and can measure the Sulphate Copper (CuSO4) liquid consentration wich the linier regresion equal is , with X hole is the sample consentration (M) and Y hole is the measure result of the concentration (M) and the deviation is 0.0326.
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3060
BERKALA FISIKA; Vol 10, No 3 (2007): Berkala Fisika; 145-153
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3060/2741
oai:ojs.ejournal.undip.ac.id:article/2458
2012-03-29T14:43:26Z
berkala_fisika:RA
Mekanisme Hamburan Defek Statis Dan Vibrasi Termal Terhadap Mobilitas Elektron Pada Film Tipis GaN
Rusdiana, Dadi
Hasanah, Lilik
Suhendi, Endi
Electrons Mobility in GaN thin films has been determined for temperature variation using approach method to the relaxation time due to the influence of static defect scattering and thermal vibrations. The simulation results show that electron mobility is strongly influenced by environmental temperature, except for the scattering of neutral impuritas type that does not affect the value of the charge carrier mobility even though the external temperature was varied. Keywords: Electrons Mobility, defect static, thermal vibration
BERKALA FISIKA
2012-03-19
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2458
BERKALA FISIKA; Vol 13, No 1 (2010): Berkala Fisika; 39-44
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2458/pdf
oai:ojs.ejournal.undip.ac.id:article/9666
2015-12-08T10:02:10Z
berkala_fisika:RA
PENGARUH GAIN TERHADAP FWHM DAN FWTM PADA CITRA B-MODE ULTRASONOGRAM (USG)
Amitasari, Ria
Suryono, Suryono
Adi, Kusworo
FWHM, Gain, Point Spread Function, Spatial resolution, USG
The effect of gain to The Width at Half Maximum (FWHM) and Full Width at Tenth Maximum (FWTM) on B-mode image ultrasonogram (USG) has been investigated. The aim of this research is to determine the effect of gain on the spatial resolution according the measurements of FWHM and FWTM. The evaluated resolution type is axial and lateral. This research used phantom multipurpose multi tissue with gain (30 dB, 35 dB, 40 dB, 45 dB, 50 dB, 55 dB and 60 dB) on frequency variation source 6,2 Mhz, 8 MHz dan 10MHz. The axial and lateral resolution images were obtained by using USG which uses B-Mode imaging. The measurement was made by using digital image and calculated objectively with MATLAB. The measurement of FWHM and FWTM was obtained from IP-PSF analysis (In Plane-Point Spread Function) using approximation for the Gaussian function. The result shows that there is influence from gain on FWHM and FWTM. The decreasing gain resulted in decreasing of FWHM and FWTM. The decreasing of FWHM and FWTM represents better spatial resolution, and vice versa. Keywords: FWHM, Gain, Point Spread Function, Spatial resolution, USG,
BERKALA FISIKA
2015-04-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9666
BERKALA FISIKA; 2015: Berkala Fisika Vol. 18 No. 2 Tahun 2015; 59-66
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9666/7742
oai:ojs.ejournal.undip.ac.id:article/3076
2012-04-07T08:53:16Z
berkala_fisika:RA
Kajian Fisis Radiasi Plasma Terhadap Organ Daun pada Pertumbuhan Awal Tanaman Anggrek Phalaenopsis amabilis [Physics Observation of Plasma Radiation for Leaves to Initial Growth of Phalaenopsis amabilis]
Nur, Muhammad
Setiari, Nintya
Azam, Much.
Selawanti, Ika Indah
The Phalaenopsis amabilis (”anggrek”) has been irradiated by nitrogen ions for growth accelereting.Irradiation technique used corona plasma technology that its electrodes configuration was point-to-plan geometry to generate nitrogen ions in air. Corona glow discharge Plasma has been generated by DC Voltage of 3.50 kV and current was 0,23 mA. Nitrogem ions that were irradiated to Phalaenopsis amabilis (”anggrek”) have been bombarded to leaf organ during 1 to 7 minutes. We used two types Phalaenopsis amabilis control: control with fertilizer and control without fertilizer. Growing of Phalaenopsis amabilis can be accellereted about 90 % compare with control without fertilizer and 30 % compare with control with fertilzer. The maximum growing of Phalaenopsis amabilis by using plasma technology for time irradiation of 1 or 2 minutes. Key words : corona glow discharge plasma, Phalaenopsis amabilis (anggrek), nitrogen, ion electrons, free radicals.
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3076
BERKALA FISIKA; Vol 10, No 1 (2007): Berkala Fisika; 53-59
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3076/2757
oai:ojs.ejournal.undip.ac.id:article/2795
2012-03-29T12:54:17Z
berkala_fisika:RA
ANALISIS MEDAN LISTRIK PADA PLASMA KORONA DENGAN KONFIGURASI CINCIN BIDANG
Wardaya, Asep Yoyo
Nur, Muhammad
It has been studied efectivity of the electric field and density of current that have been determined by the physical criteria from a long size of cylinder and a radius of thin ring from the corona plasma generator with the plane ring electrode. The result of the calculation is indicate that the strong electrics field will be resulted by the configurations of the thin ring form, contiguity apart between the thin rings (minimum cylinder length) and the size of the thin ring radius which near of the size of external cylinder radius. The radial symmetrical of geometric form of the thin ring is causing it has not current density form at tip of the thin ring. Key words : Plasma, plane-ring, electric field, density of current.
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2795
BERKALA FISIKA; Vol 13, No 4 (2010): Berkala Fisika; 139-144
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2795/pdf
oai:ojs.ejournal.undip.ac.id:article/23480
2019-06-25T13:51:34Z
berkala_fisika:RA
KORELASI POLARISASI ELEKTRO-OPTIS DENGAN KOMPOSISI ASAM LEMAK PADA MINYAK ZAITUN SEBAGAI METODE UJI ALTERNATIF MUTU MINYAK GORENG
Nurhasanah, W Dewi
Sugito, Heri
Richardina, Very
Azam, Much
Firdausi, Ketut Sofjan
Electro-optical polarization, olive oil, fatty acid composition, change in polarization angle
In this study the quality of olive oil which has been degraded due to heating has been tested using the electro-optical transmission polarization method. The light source used was a laser pointer with λ = 650 nm. The degradation of the quality of olive oil was measured to be based on changes in the electro-optical polarization angle, while changes in the composition of fatty acids were tested using Gas Chromatography and Mass Spectroscopy (GCMS). The results showed that the polarization angle increases in second order polynomial on the increase in voltage and linearly on the heating duration in the sample which showed a decrease in the quality of homogeneous olive oil. Assuming that the polarization change is a linear combination of the main fatty acids from olive oil, it is obtained that C19:2 and C19:0 fatty acids are the most contributing to oil quality, that is, the reduction in oil quality is indicated by increasing polarization which is accompanied by an increase in C19:0 fatty acids and a reduction in C19:2 fatty acids. Whereas specifically for electro-optical polarization, in addition to C19:2 and C19:0 fatty acids, C19:1 also appears which slightly increases polarization by increasing the fatty acid. This method can be developed further for investigation into other vegetable oils, as well as evaluating halal oil due to contamination of lard.Keywords: Electro-optical polarization, olive oil, fatty acid composition, change inpolarization angle
BERKALA FISIKA
2019-05-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/23480
BERKALA FISIKA; Vol 22, No 1 (2019): Berkala Fisika Vol. 22 No. 1 Tahun 2019; 24-31
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/23480/15169
Copyright (c) 2019 BERKALA FISIKA
oai:ojs.ejournal.undip.ac.id:article/3093
2012-04-07T10:32:25Z
berkala_fisika:RA
Rancang Bangun Sistem Pengukur Konduktivitas Larutan Elektrolit Menggunakan Mikrokontroler AT89C51
Sumariyah, Sumariyah
Yulianto, Tony
Priyono, Jumadi
A system of electrolyte conductivity measurement has been designed and realized using microcontroller AT89C51. The system run at the frequency 2.5 Mhz. The adventage of the system is conductivity sensor placed outside the sample liquid. The input of system is NaCl concentration and the output is conductivity value.The hardware of this system is built by a conductivity sensor, oscillator XR-2206, a frequency synthesizer IC CMOS 4046, an operational amplifier LM358, an analog to digital converter ADC 0804, a liquid crystal display Seiko M1632, and a microcontroller AT89C51. To control this electrolyte liquid conductivity measurement was used macro assembler machine language.The results of the experiment show that the test of variable oscillator function has linear regression equation Y = 0.56 X + 1.96, amplification of LM358 amplifier test is 3.39 and has linear regression equation Y = 3.28 X + 0.05, ADC0804 conversion function has linear regression equation Y = 51.29 X + 9.97. The test of measurement system was sown that instrument able to measure NaCl conductivity from 0.2 M until 2.0 M with linear regression equation Y = 67,63x + 6,37.
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3093
BERKALA FISIKA; Vol 9, No 3 (2006): Berkala Fisika; 157-163
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3093/2774
oai:ojs.ejournal.undip.ac.id:article/2874
2012-03-29T14:25:06Z
berkala_fisika:RA
PENGARUH PENAMBAHAN POLIMER EMULSI VINYL ACECATE CO ACRYLIC PADA TANAH LEMPUNG TERHADAP UJI PERMEABILITAS MELALUI CONSTANT HEAD PERMEABILITY TEST
Halauddin, Halauddin
Suhendra, Suhendra
Permeability is rate of movement an fluid in soil through a media have relation pore micro and macro way, happen of vertical and horizontal. Permeability of soil depend on pore mean size measure influenced by particle size measure distribution, viscosity, particle form and soil structure. Smaller soil particle size measure, smaller also pore size measure and progressively lower ability of the soil to overcome fluid. This research aim to know the level of permeability coefficient value of soil residing in gristle area slide by pass Bengkulu Kepahiang by using method permeameter of permeability head constant by comparing given by permeability value is emulsion polymer and do not give by type emulsion polymer of poly vinyl acetate co acrylic (PVA). This research have done in laboratory have the character of pure experiment and conducted sometime. From result of research, obtained that: value permeability of biggest soil before given by emulsion polymer of PVA there are at location III equal to 8,62.10-3 cm/s, and value permeability of smallest soil before given by emulsion polymer there are at location I equal to 3,87.10-3 cm/s. While value permeability of biggest soil after given by emulsion polymer of PVA there are at location V equal to 0,96.10-3 cm/s, and value permeability of smallest soil after given by emulsion polymer there are at location IX equal to 0,10.10-3 cm/s. Keywords: Permeability, constant head permeability, pore of size, polymer of emulsion and poly vinyl acetate co acrylic (PVA).
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2874
BERKALA FISIKA; Vol 14, No 2 (2011): Berkala Fisika; 55-62
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2874/2557
oai:ojs.ejournal.undip.ac.id:article/4972
2013-05-27T11:15:19Z
berkala_fisika:RA
STRUKTUR NANOKRISTAL CeO YANG DISINTESIS MENGGUNAKAN METODE PRESIPITASI DENGAN VARIASI LAMA WAKTU KALSINASI 2
Nursanti, Ida
Muhlisin, Zaenul
Sutanto, Heri
Nurhasanah, Iis
Nanocrystalline CeO have been synthesized by using a precipitation method. in a mixedsolvent system of aqua DM and isopropanol. Precipited was calcined at temperature of 300 C forvarious calcination time. X-ray difractometer was used to investigate resulting presipitedmicrostructure. X-ray diffraction patterns were analyzed to study effect of calcination time tostructure and crystallite size. Refinement process of x-ray diffraction pattern was carried out byusing Rietveld method. The results show that all of precipited were CeO nanocrystalline withsingle phase of cubic fluorite. The difference in lattice parameter was correlated to oxygenvacancy. Crystallite size was found in the range 9 – 11 nm, its incresed as calcination timeincreased. The increasing of calcination time did not significant influence to crystallite size. These result indicated that CeO nanocrystalline exhibited weak-agglomeration.Keywords: CeO222, nanocrystalline, microstructure, x-ray diffraction, precipitation 2o
BERKALA FISIKA
2011-10-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4972
BERKALA FISIKA; Vol 14, No 4 (2011): Berkala Fisika; 115-122
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4972/4505
oai:ojs.ejournal.undip.ac.id:article/2930
2012-03-30T14:27:40Z
berkala_fisika:RA
Rancang Bangun Detektor Gerak Menggunakan Infra Merah Dengan Memanfaatkan Layanan Sms Pada Telepon Seluler Berbasis Mikrokontroler AT89S52
Widiyatmoko, Anjar
Sumariyah, Sumariyah
A infrared movement detector using Short Message Service based on AT89S52 microcontroller has been designed and realized. The detector can be used for monitoring any passing object in the room. This research can be used to detect up to four object in the different room. The detector was consisted one control station and one receiver station. The control station used four couple of infrared transmitter and receiver. The receiver station of mobile station was used to receive message from control station. This detector was consisted of hardware and software. The hardware was designed with infrared transmitter, an 38 kHz infrared sensor, an op-amp comparator used to compare infrared sensor output voltage. The Transmitter emitted infrared ray and received by sensor. Any moving object passed between them producing the output voltage of infrared receiver change and proceed to comparator resulting high output. This high output signal used as trigger event to running sending message procedure. And the designed software for microcontroler was written in C language. The research showed the passed object passed infrared transmitter can be detected is received and the SMS by mobile station is matched as the location of passing object through the infrared sensor. Keywords: Short Message Service, Microcontroller, Infrared
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2930
BERKALA FISIKA; Vol 12, No 1 (2009): Berkala Fisika; 15-20
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2930/2618
oai:ojs.ejournal.undip.ac.id:article/4989
2013-05-27T16:02:58Z
berkala_fisika:RA
PEMBUATAN KOMPOSIT SERAT SERABUT KELAPA DAN RESIN FENOL FORMADEHIDE SEBAGAI MATERIAL PEREDAM AKUSTIK
Kartikaratri, Yohana Maya
Subagio, Agus
Widyandari, Hendri
The sound pollution due to noise is a one clasical problem in Indonesia. Theloudness can be reduced using the accoustic absorber. The composites of coconut fiberhas potential application as an environmental friendly accoustic absorber which is usingan agriculture waste. We reported the preparation of composite of coconut fiber as amatrix material and fenol formaldehide served as binder (coconut fiber/FF composite).The immersion of coconut fibers in the NaOH solution of 2% for 4 hours were caried outpriorly for improving the strengthness.The absorption coefficient (α) of the preparedcoconut fiber/FF composite was observed using two microphone impedance tube method(ISO 10534 – 2 dan ASTM E1050 – 08. The value of tested absorption coefficient (α) allof composites samples have fulfilled the requirement. Requirement of acoustic absorbervalue of α is more than 0,15; and all of composites samples fulfilled the requirement onfrequency 752 Hz - 6400Hz. Keyword : absorption coefficient, acoustic absorber, composite, coconut fiber, fenolformaldehid.
BERKALA FISIKA
2012-07-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4989
BERKALA FISIKA; Vol 15, No 3 (2012): Berkala Fisika; 87-90
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4989/4522
oai:ojs.ejournal.undip.ac.id:article/2979
2012-04-03T12:35:27Z
berkala_fisika:RA
Estimasi Ketebalan Sedimen dan Kedalaman Diskontinuitas Mohorovicic Daerah Jawa Timur dengan Analisis Power Spectrum Data Anomlai Gravitasi
Dwi Indriana, Rina
Gravitation anomaly research had been done to predict the depth of sediment. The gravitation research covered East Java from north coast to south coast, Indonesia. By using power spectrum method the average of sediment depth could predicted. Power spectrum method based on FFT theorem. A Short wavelength signal was correspond to narrow source and a long waveleght signal corresponds with shallow source. The power spectrum result was two discontinuities. The depth of narrow discontinuity is 2,7 km and 25,6 for the shallow continuity. The shallow discontinuity predicted as Mohorovicic layer. Keyword: power spectrum, gravitation anomaly, discontinuity
BERKALA FISIKA
2012-04-03
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2979
BERKALA FISIKA; Vol 11, No 2 (2008): Berkala Fisika; 67-74
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2979/2663
oai:ojs.ejournal.undip.ac.id:article/2998
2012-04-04T07:35:26Z
berkala_fisika:RA
Sistem Pendeteksi Suhu dan Asap Pada Ruangan Tertutup Memanfaatkan Sensor LM35 Dan Sensor AF30
Usuman, Ilona
Aardhi, Hasmi
As is known together for this cause of the fire is very varied, ranging from natural factors, or electrical short circuit can occur because of the element of intent. Due to these reasons, so it is necessary to have a system that can detect early occurrence of fire. Fire monitoring system must be able to accommodate the nature of the fire.By leveraging the LM35 sensor that functions observed rise in temperature and observing the presence of smoke sensors AF30 can be created around the smoke detector and temperature using LM35 sensor and microcontroller AT89S51 AF30 sensor and equipped with facilities to send sms if there is any indication of a hazard or fire will occur. The results show that the system could work well in the prototype room with a distance of heat source and smoke source ± 5cm from the two sensors, when the system detects hot and smoke, the water pump, buzzer and fan that is connected to a relay works, then sms will be sent to the user. The temperature sensor detects the heat from 25 degrees to 60 degrees, while the temperature is 55 degrees is considered dangerous. Sensors detect smoke cloud of smoke from 30 to 125 mvolt mvolt, cloud of smoke which is considered the danger is over 125 mvolt. Keywords: Fire, LM35 temperature sensor, smoke sensor AF30, Short Message Service (SMS)
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2998
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus; B1-B6
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2998/2682
oai:ojs.ejournal.undip.ac.id:article/5262
2013-08-01T09:45:32Z
berkala_fisika:RA
PENDUGAAN MODEL ANOMALI MAGNETIK BAWAH PERMUKAAN DESA DARMAKRADENAN, KECAMATAN AJIBARANG, KABUPATEN BANYUMAS
Sehah, Sehah
Raharjo, SUkmaji Anom
Magnetic survey has been carried out to estimate the subsurface magnetic anomaly model inDarmakradenan Village, Ajibarang District, Banyumas Regency. After the data processing whichincludes some corrections and reductions, then obtained the residual magnetic anomaly data in theresearch area. Then this magnetic anomaly data was modeled use Mag2DC for Windows software,thus obtained four subsurface anomalous objects, which are interpreted as coarse grained sandstones, conglomerates, and andesitic breccias from Tapak Formation (χ = 0.0055 cgs units), lava depositionof Slamet Volcano; with boulder of basaltic-andesite from old Slamet Volcano eruption (χ = 0.0175 cgs units), andesitic sandstone, tuff conglomerate, and marl which insert of sandstone from HalangFormation (χ = 0.0015 cgs units), and limestones from Tapak Formation (χ = 0.0035 cgs units). The research areas have natural resources of limestone that is being cultivated mining now. While thepresence of gold minerals can not be determined, but is expected in the old alluvial deposits of TapakFormation and Halang Formation.Keywords: Magnetic anomaly, subsurface, Darmakradenan Village
BERKALA FISIKA
2013-07-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5262
BERKALA FISIKA; Vol 16, No 3 (2013): Berkala Fisika; 85-94
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5262/4747
oai:ojs.ejournal.undip.ac.id:article/3038
2012-04-07T12:46:04Z
berkala_fisika:RA
Membangun Filter Berdasarkan Model Amblesan dan Dinamika Muka Air Tanah Untuk Memisahkan Sumber Anomali Gaya Berat Mikro Antar Waktu
Supriyadi, Supriyadi
Filter has been fabricated based on the model of microgravity two sources of anomalies over time, ie subsidence and groundwater level dynamics. Model adjusted for field conditions with several assumptions, one of which is the porosity of the aquifer consists of homogeneous sand and clay sand is 30% filled with water. Gravity response due to subsidence, soil water dynamics and combined the two done 2D FFT. FFT process is changing the data from the spatial region to region frekuensi. Furthermore, the filter is built by performing mathematical operations division, which is output divided by input. The output data of the gravity response due to subsidence or ground water dynamics, and input is combined response and the dynamics of gravity due to subsidence of ground water. Experimental results show that in order to create a filter that gives a small error when using filters subsidence dimensional (XY) of the same or greater dimension of subsidence are filtered. Differences dimensional subsidence subsidence filter with a filter at X = 100 m and Y = 100 m gives 1.744% error. Giving a small error when using filters subsidence dimension (Z) the same or smaller dimensions are filtered subsidence. Differences dimensional subsidence subsidence filter with a filter of 1 cm gives 7.322% error. For the case of subsidence of more than one location indicates that the smallest error occurs if you use the filters subsidence dimension equal to - average dimensions of subsidence to be filtered. Keywords: filter, subsidence, groundwater
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3038
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus; D1-D10
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3038/2720
oai:ojs.ejournal.undip.ac.id:article/7386
2014-09-24T09:08:47Z
berkala_fisika:RA
KAJIAN LAHAN GAMBUT SEBAGAI CALON LOKASI/TAPAK PLTN
Khusyairi, Akhmad
The utilization of nuclear technology for energy will increase significantly which will supply electricity demand in the future. Geologically, Indonesia has varied condition which imply to design, operation and emergency plan. Peat lands have specific physical and chemical natures, therefore the owner should pay attention for this site to be assessed. The general potential hazard is peat lands fire during summer season which is effected by deforestation and low level of water surface, which will influence to the plants structure integrity. The assessment method which was used is literature study. Keywords: Peat lands, NPP, nuclear, electricity
BERKALA FISIKA
2014-04-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/7386
BERKALA FISIKA; 2014: Berkala Fisika Vol. 17 No. 2 Tahun 2014; 55-60
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/7386/6034
oai:ojs.ejournal.undip.ac.id:article/3055
2012-04-07T12:44:51Z
berkala_fisika:RA
Efek Magnetooptis Pada Lapisan AgBr Terekspos
Sulistyo, Respita
Firdausi, K. Sofjan
Marhaendrajaya, Indras
The non linear optic characteristic from several transparent medium (film plate and glass) under influence of external magnetic field and variation of wavelengths, have been identified. In this experiment, the developed AgBr film is deposited on a hologram. The magnetic field has been produced by coils which connected to slide regulator (0-240V). The maximum value of magnetic field is about 182,0 mT. Light sources used are He-Ne Laser with a wavelength of 633 nm and 1 mW in power, and green laser pointer with a wavelength of 532 nm and power less than 5 mW. The optical characteristic measured in this experiment is the rotation of electric field, of the transmitted laser beam due to applied external magnetic field to the medium. The experiment result shows that is dependent linearly on magnetic fields. The Verdet constant is proportional with wavelength of the light. Measured values for Verdet constant (V) at 632,8 nm is (0,487300,00070) min/G-cm and at 532 nm is (0,261700,00056) min/G-cm for glasses material and the values for Verdet constant at 632,8 nm is (0,328500,00060) min/G-cm and at 532 nm is (0,156900,00039) min/G-cm for film plate. Key words:Magnetooptical effect, non linear optic, Verdet constant
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3055
BERKALA FISIKA; Vol 10, No 3 (2007): Berkala Fisika; 111-117
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3055/2736
oai:ojs.ejournal.undip.ac.id:article/2882
2012-03-29T15:28:20Z
berkala_fisika:RA
Model Perhitungan Titik Gelombang Pecah (Point Breaker Wave) Disekitar Pantai
Gernowo, Rahmat
In this paper will be studied numerically the point breaker wave characteristic on shore. The model equation of the surface wave based on the equations which is governed by combining the refraction-diffraction on mild slope bottom. As mathematical analysis approximation, the finite difference methods was us for understanding the characteristic behavior of the surface wave on shore. The numerical simulation is obtained from the result of the numerical computation. There are significance changes of the height of wave, which is influenced by mild slope bottom factor (shoaling), diffraction and refraction. Key Word: Point Breaker Wave, finite difference, diffraction and reffraction.
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2882
BERKALA FISIKA; Vol 12, No 2 (2009): Berkala Fisika; 43-48
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2882/2565
oai:ojs.ejournal.undip.ac.id:article/9381
2015-11-05T08:34:47Z
berkala_fisika:RA
RANCANG BANGUN SISTEM PENGUKURAN PERGESERAN TANAH MENGGUNAKAN SENSOR VARIABEL RESISTOR
Sugito, Sugito
Hartono, Hartono
Permadi, Ipung
variable resistor, sensor, Wheatstone bridge, characterization
The phenomenon of ground motion are things that need serious attention. The impact that can be caused by the ground motion can not be underestimated. The velocity of ground motion at each area has different characteristics. Monitoring of ground motion continuously is one way to be able to determine the policy relating to protection measures. Variable resistor is a component that can be used to detect the presence of such a shift. Variable resistor connected to the shear plane using a cord will be amended proportional with the shift in resistance value of shear plane. Variable resistor arranged with others resistor to form a Wheatstone bridge circuit. Thus the change in resistance on the variable resistor will produce a voltage change. Value of voltage changes were characterized to obtain the calibration equations, response time and stability of the sensor. Data acquisition is done by using a personal computer and the device interface DAQ NI USB6009. While programming created using LabView 7.1 software. Based on the results obtained by testing the sensor response time is very good sensor is equal to 0.47 seconds. Highly stable sensors to take measurements, look at the value of the average reading deviation of 1.14 %. The sensor has a measurement in the range of 0 to 17 cm. Keywords : variable resistor, sensor, Wheatstone bridge, characterization
BERKALA FISIKA
2015-01-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9381
BERKALA FISIKA; 2015: Berkala Fisika Vol. 18 No. 1 Tahun 2015; 9-16
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9381/7564
oai:ojs.ejournal.undip.ac.id:article/3071
2012-04-07T08:51:30Z
berkala_fisika:RA
Analisis Fenomena Elektrohidrodinamik pada Permukaan Minyak Silikon Menggunakan Plasma Lucutan Pijar Korona Positif
Rahayu, Sri
Azam, M.
Triadyaksa, Pandji
Nur, Muhammad
The aim of this research is analysis electrohydrodynamic phenomenon deformation of oil silicon surface by technology of positive corona glow discharge plasma which generated by plasma generator system with point-to-plane electrodes geometry configuration. Variation of voltage and distance between electrodes had been treated to surface of silicon oil. Electrohydrodynamic phenomenon deformation in this research is caused by polarization and ion wind. Ionic wind would be happened if applied voltage over the corona threshold that was 2.6 kV. Graph current of saturation corona unipolar for variation voltage, being formed semi-parabolic equation while the variation of distance between electrodes, being formed linear equation. The hole diameter at variation voltage was influenced by electrics field intensity and momen dipole strength. The hole diameter at variation of distance between electrode was influenced by parabolic angle of electrics line field. The oil velocity for back to initial position is different. Velocity would be go down if the voltage progressively go up and velocity would be go up if the distance between electrode progressively go up.
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3071
BERKALA FISIKA; Vol 10, No 1 (2007): Berkala Fisika; 13-23
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3071/2752
oai:ojs.ejournal.undip.ac.id:article/2767
2012-03-29T14:39:19Z
berkala_fisika:RA
Studi Peningkatan Output Modul Surya Dengan Menggunakan Reflektor
Sidopekso, Satwiko
Febtiwiyanti, Anita Eka
Efforts to optimize the power output of solar modules using a mirror. In this study used 2 pieces of flat mirrors as solar reflectors mounted on the right and left of the solar module. Measurement is done by directing the position of solar modules in order to obtain optimum results with a corner reflector 50 0, 600, 700. Based on the measurement results, we obtained at maximum power cost solar modules using the corner reflector 600. The increase in power output compared to 92.7% without using a reflector. Keywords: reflector, solar module, output power
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2767
BERKALA FISIKA; Vol 13, No 3 (2010): Berkala Fisika; 101-104
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2767/pdf
oai:ojs.ejournal.undip.ac.id:article/12802
2016-12-16T09:42:33Z
berkala_fisika:RA
REVIEW OF A SIMPLE POWERFUL POLARIZER FOR TESTING OF EDIBLE OIL QUALITY
Firdausi, Ketut Sofjan
Rahmawati, Henik
polarization, oil quality, saturated fatty acid
In this paper, we have shown that a simple pair of polarizer can be used to measure natural optical activity in total complex oil (vegetable oil and fats). A similar concept with quantum physics has been discussed to describe briefly the probability in finding a particle within certain region with the change of polarization due to the interaction light with saturated fatty acids. The light source was fluorescence lamp and the experimental condition was kept stable, i.e. constant temperature and constant humidity. The angle of polarization was measured repeatedly until 50 times. Our relative uncertainty measurement has been obtained up to 5% and this is obviously clear to be able to differentiate various different quality of oil. More important result is that ordinary light polarization can be used as powerful test to show various quality level of oils better than recent standard methods. A good prospect has also been obtained for halal level testing. It is found that average value of polarization in lard (pig oil) is relatively higher than the others.Keywords: polarization, oil quality, saturated fatty acid
BERKALA FISIKA
2015-10-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/12802
BERKALA FISIKA; 2015: Berkala Fisika Vol. 18 No. 4 Tahun 2015; 137-142
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/12802/9594
Copyright (c) 2016 BERKALA FISIKA
oai:ojs.ejournal.undip.ac.id:article/3088
2012-04-07T12:36:50Z
berkala_fisika:RA
Respon Non Linier Sifat Optis Larutan MgSO4
Firdausi, K. Sofjan
Azam, Much.
Romadhona, Thithit
Abadi, Prayitno
A response of nonlinear optic of several salt solutions in external magnetic field has been studied. An altered magnetic field varies from 0 until 0,2T used to induce samples, and then change of polarization angle b is measured by polarizators, where the direction propagation of laser is perpendicular to the direction of B. Various concentration of solution is used at 5% until 35%. Our experiment shows that the graphs of b vs. B are still linear for mineral water and NaCl solution. However, for MgSO4 solution, we obtained polynomial tendency of this graph. At 20% until 35% of concentration of this solution it has polynomial in third order. Keywords: Nonlinear optics, change of polarization angle, external magnetic field.
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3088
BERKALA FISIKA; Vol 9, No 3 (2006): Berkala Fisika; 115-118
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3088/2768
oai:ojs.ejournal.undip.ac.id:article/2864
2012-03-29T15:40:30Z
berkala_fisika:RA
Pemanfaatan Teknik Lissajous untuk Mengetahui Korelasi antara Kandungan Air terhadap Sifat Dielektrik Tanah (Studi Kasus: Sampel Tanah Permukaan di Sekitar Kota Purwokerto)
Sehah, Sehah
Nur Aziz, Abdullah
Irayani, Zaroh
The equipment has been designed to measure the dielectric properties of soil samples with lissajous technique in Basic Physics Laboratory, Study Program of Physics, Faculty of Science and Engineering, University of Jenderal Sudirman, Purwokerto. The equipment has been used to measure the dielectric constant of 19 soil samples taken from several locations in area of Purwokerto city and its surrounding, at a frequency of 100 kHz. The measurement has been conducted on soil samples with the variation of soil mass water content. The results obtained indicate, the existence of a correlation between the dielectric constant of soil samples to the soil water mass content (h) which can be expressed with two equations; dielectric permittivity e = 0.3176 h-2.5555 with a correlation coefficient R2 = 0.9538, and dielectric loss equation e'= 0.00003 h -5.3336 with a correlation coefficient R2 = 0.9513.
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2864
BERKALA FISIKA; Vol 12, No 3 (2009): Berkala Fisika; 77-84
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2864/2550
oai:ojs.ejournal.undip.ac.id:article/3104
2012-04-07T12:41:37Z
berkala_fisika:RA
PEMODELAN TOMOGRAFI CROSS-HOLE METODE GEOLISTRIK RESISTIVITAS (Bentuk Anomali Silindris)
Prabowo, Riza Eka
Yulianto, Gatot
Nurwidyanto, M. Irham
Cross-hole method using an amount of electrode were placed downhole is one of tomography method. Cross-hole tomography method delineate the geological conditions of the earth surface therefore it takes an important rule in the case of anomaly monitoring. The buis concrete planted in subsurface with deepness of about 1 m were used as the source of anomaly. Tomography cross-hole data with configuration such as pole-pole, pole-bipole, bipole-pole and bipole-bipole array were taken with the depth of the borehole is 1,2 m. The space variation of one electrode to another in the hole of drill is 0,2 m, 0,4 m, 0,6 m and 0,8 m for the configuration of pole-bipole, bipole-pole and bipole-bipole. Res2Dinv program obtained the images of bipole-bipole better than the images of other configuration. While the pole-pole configuration had the worst images compared to others. It is caused by two remote electrode of pole-pole array while bipole-bipole array do not have ones. Key words: cross-hole, tomography, borehole, remote electrode
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3104
BERKALA FISIKA; Vol 9, No 1 (2006): Berkala Fisika; 23-30
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3104/2785
oai:ojs.ejournal.undip.ac.id:article/2925
2012-03-30T14:33:16Z
berkala_fisika:RA
Koreksi Tekanan Gas Ideal untuk Plasma sebagai Materi Fase ke empat dan Penerapannya pada plasma Argon
Nur, Muhammad
Pehitungan secara analitik telah dilakukan untuk memperoleh perumusan tekanan pada plasma. Perhitungan dengan pendekatan non kuantum ini megunakan fungsi-fungsi termodinamika dalam gas seperti entropi, entalpi, energi bebas Helmholtz, energi bebas Gibs dan fungsi-fungsi partisi partikel dalam Plasma. Perumusan yang diperoleh digunakan untuk menentukan tekanan pada plasma korona Argon densitas tinggi dan plasma Argon gelombang mikro pada tekanan gas awal 1 atmosfer. Hasil pehitungan tekanan diperoleh perbedaan dantara tekanan gas panas dengan tekanan kondisi plasma sebesar ΔPplasma1/24π Pgas dimana tekanan pada kondisi plasma lebih kecil dari tekanan gas panas. Penerapan terhadap plasma korona argon densitas tinggi, ditemukan bahwa tekanan plasma berubah secara parabolik terhadap perubahan densitas dan tekanan plasma berubah secara linear terhadap temperatur. Key words:Plasma. gas panas, tekanan, termodinamika, energi bebas, argon, densitas, temperatur
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2925
BERKALA FISIKA; Vol 12, No 4 (2009): Berkala Fisika; 161-170
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2925/2613
oai:ojs.ejournal.undip.ac.id:article/4983
2013-05-27T14:18:31Z
berkala_fisika:RA
PERUBAHAN BUTIR DAN PENENTUAN TEMPERATUR PEMBENTUKAN BARIUM HEXAFERRITE TERSUBSTITUSI ION Mn+2 Dan Ti+4 MELALUI MEKANISME MEKANIKA MILLING
Priyono, Priyono
Manaf, A
Abstract Ferrite as magnetic material has been exploited for various the application for exampleas electronic peripherals and optic like hard magnetic also soft magnetic materials. For theapplication of high frequency usually exploited as circulator, phase shifter and absorber and antidetection material. In research has been done synthesis and characterization of sewer structuresnanocristall barium phase hexaferrite substitution is partial with ion Manganese and Titaniumthrough mechanics engineering alloy. Indicated that monophase formation of Barium Hexaferriteis substitution by Mn+2 and Ti+4 happened at growth temperature above 7500 C. At low relativetemperature 5000 C and 750 0 C , 8500 C and 10000 C result of plant from mechanics processalloy is not happened formation of phase, but only experiences recrystallization to returnfollowed with magnification growth of grain its. Above heating 7500 C plant grain desisted andhappened orthogonal transformation of off the cuff phase towards formation of bariumhexaferrite substitution by Mn+2 and Ti+4 ions. In research is not found existence of intermediatephase during formation of the phaseKeywords: recrystalization, high frequency, intermediate phase, ferrites
BERKALA FISIKA
2012-04-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4983
BERKALA FISIKA; Vol 15, No 2 (2012): Berkala Fisika; 57-62
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4983/4516
oai:ojs.ejournal.undip.ac.id:article/2974
2012-04-03T11:49:51Z
berkala_fisika:RA
Analisis Sudut Kemiringan Lempeng Subduksi di Selatan Jawa Tengah dan Jawa Timur Berdasarkan Anomali Gravitasi dan Implikasi Tektonik Vulkanik
Dwi Indriana, Rina
Gravitation anomaly research had been done to predict the subduction dip and model. The gravitation research covered East and Central Java, Indonesia. Upward continuation used for regional anomaly mapping. Two dimension modeling from each cross-sectional used grav2poly or grav2dc. From 2D model subduction dip was calculated. The research result were subduction dip various between 3,40 to 8,20. There is a suggestion that low magnitude of dip correlated with volcano activity and high magnitude of dip correlated with some depresstion zone. Key word: subduction zone, subduction dip, gravitation modeling
BERKALA FISIKA
2012-03-30
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2974
BERKALA FISIKA; Vol 11, No 3 (2008): Berkala Fisika; 89-96
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2974/2659
oai:ojs.ejournal.undip.ac.id:article/5002
2013-05-27T15:53:20Z
berkala_fisika:RA
KAJIAN RADIOGRAFI DIGITAL TULANG TANGAN
Susilo, Susilo
Setiabudi, Wahyu
Kusminarto, Kusminarto
Suparta, G. B.
Teknologi diagnostik medis yang digunakan pada unit radiologi di rumah sakit sudahcenderung bergeser dari teknologi analog berbasis film menjadi teknologi digital (filmless). Salahsatu cara membuat system radiografi tanpa film adalah dengan cara konversi digital menggunakantabung kedap cahaya (light tight tube). Dalam penelitian ini, kami telah mengkaji kemungkinanpemanfaatan sistem pencitraan radiografi digital sinar-x berbasis X-Ray Intensifying Screen(XRIS) dihubungkan dengan perangkat frame-grabber. Hasil eksperimen tahap awal untukmemperoleh radiograf tulang tangan menunjukkan bahwa sistem ini cukup dioperasikan padategangan anode-katode 50 kV, arus waktu filamen 50 mAs dan waktu paparan 0,1 detik untukmenghasilkan citra yang cukup dapat dilihat. Untuk sekali paparan, dimungkinkan memperolehbeberapa citra untuk obyek yang sama pada posisi tetap, tipa-tiap citra mengandung informasiradiografi berbeda ditunjukkan oleh distribusi tiap citra yang bervariasi. Hasil ini menunjukkanbahwa sistem ini diharapkan lebih efisien dan lebih efektif dibandingkan dengan metodekonvensional berbasis film, dan dapat dikembangkan untuk diagnose mineral tulang.Kata kunci: radiografi digital; filmless; sinar-x; tulang tangan
BERKALA FISIKA
2013-01-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5002
BERKALA FISIKA; Vol 16, No 1 (2013): Berkala Fisika; 15-20
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5002/4535
oai:ojs.ejournal.undip.ac.id:article/5215
2013-07-30T08:53:12Z
berkala_fisika:RA
VARIASI MODEL LEFT-RIGHT SYMMETRY DALAM FISIKA PARTIKEL DAN KESESUAIANNYA TERHADAP ANOMALI CHIRAL
Maulana, Qidir
Satriawan, Mirza
It has been done variation left-right symmetry model in particle physics that depend onL R I SU(2) ⊗SU(2) ⊗U(1) gauge. With assumption leptons and quarks sector massformation is different, so we introducing new particles in quarks sector , , , L L R U D U and R D .From this idea will be examined chiral anomaly to decide are this variation model can becandidate besides standard model of particle physics.Keywords : left-right symmetry model, chiral anomaly
BERKALA FISIKA
2013-04-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5215
BERKALA FISIKA; Vol 16, No 2 (2013): Berkala Fisika; 53-56
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5215/4715
oai:ojs.ejournal.undip.ac.id:article/3032
2012-04-05T15:03:10Z
berkala_fisika:RA
Penentuan Gaya Tolak Menolak Magnet Antar Dua Magnet Permanet Menggunakan Metode Kesetimbangan Benda
Asih Nugroho, Kuncoro
Use of magnets vary in life. Use of magnets depending on needs. Magnets can be used from the side: the field is generated, attractive force and repel force between the two magnets. Special utilizing repel forces magnetic one used on the railways to reduce the friction between wheel and rail.One way to determine the amount of repel force magnet is to use the object equilibrium. Two similar magnetic poles will repel. Large repulsion force depends on magnetic field (B) accrued and distance (r) the two magnets. Two magnets with similar poles are placed in the shell will give rise to vertical distance between the magnets to each other. There is a balance between the repulsive magnetic force with the gravity due to the mass of the magnet when the magnet above the rest. Magnetic repulsive force can be determined for certain r by changing the magnetic mass. Large magnetic gravity on each r can be computed from the gravity due to the magnetic mass. Keywords: repel force, gravity
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3032
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus; C39-C44
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3032/2715
oai:ojs.ejournal.undip.ac.id:article/6577
2014-03-21T15:24:15Z
berkala_fisika:RA
Kajian Efisiensi dan Karakterisasi Produksi Ozon dengan Lucutan Plasma Berpenghalang Dielektrik (DBDP) untuk Pengendalian Jamur dalam Beras
Rachman, Dian Arif
Nur, Muhammad
Kusdiyantini, Endang
A research about the influence of ozone on fungi which living on rice type mentik that used natrium agar (TPC methode) media has done. The research was done at normal temperature and the outside air pressure with free air as a source of ozone. The ozone concentration of 2.91 up to 3.19 ppm was radiated on 7 differnet samples of rice, each sample 50 gram used ozonized time variation 0 minutes, 30 minutes, 60 minutes, 90 minutes, 120 minutes, 150 minutes and 180 minutes. It was obtained results the number of fungi that died of 97,3 % after ozone irradiated for 30 minutes and 99,2% after 60 minutes. Total number of fungi which has dead during 150 minutes as much 99,9 %. Characterization of ozone conducted using ozone reactor (Dielectric Barrier Discharge Plasma). variation in the voltage and the rate of air flow was performed to obtain the optimum concentration of ozone. Voltage variation started from 6 kV, 6 kV, 8 kV and 6 kV whereas variation of oxygen flow rate of 0.5 L/min, 1 L/min, 2 L/min and 3 L/minute. The results obtained with the same tendency which is that at the same voltage, the higher the air flow rate and declining concentrations of ozone. On the study for flow rate of 0.5 L/min the ozone concentrations was obtained 4.6 up to 6.8 ppm. While for flow rate of 3 L/minute ozone concentrations was obtained 2.9 up to 4.8 ppm. Keywords: fungi, natrium agar, irradiate, reactor
BERKALA FISIKA
2014-01-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/6577
BERKALA FISIKA; 2014: Berkala Fisika Vol. 17 No. 1 Tahun 2014; 21-24
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/6577/5411
oai:ojs.ejournal.undip.ac.id:article/3050
2012-04-06T20:08:51Z
berkala_fisika:RA
Studi Interferometer Fabry-Perot Untuk Pengukuran Panjang Gelombang Cahaya
Satoto, Dwi
Sugito, Heri
Firdausi, K. Sofjan
In this experiment, an interferometer Fabry-Perot method has been used to measure wavelength of diode laser. The first step is to calibrate the micrometer displacement using He-Ne laser in order to measure the diode and He-Ne wavelength. By shifting movable mirror, the transition of interference fringe in counted against the displacement of movable mirror. For the result of measurement, it is obtained for the wavelength of the red diode laser of, and green diode laser of. Key word: Interferometer Fabry Perot, multiple beam interference.
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3050
BERKALA FISIKA; Vol 10, No 4 (2007): Berkala Fisika; 179-181
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3050/2731
oai:ojs.ejournal.undip.ac.id:article/9295
2015-10-19T16:17:58Z
berkala_fisika:RA
DISTRIBUSI DOSIS PHOTON MENGGUNAKAN TEKNIK 3DCRT DAN IMRT PADA RADIASI WHOLE PELVIC KARSINOMA SERVIKS
Suhartono, Bambang Haris
Setia Budi, Wahyu
Hidayanto, Eko
Cancer therapy in carcinoma of the cervix performed with external radiotherapy modalities box beam photon field and 3-Dimension Conformal Radiotherapy (3DCRT) and Intensity Modulation Radiation Therapy (IMRT). IMRT compared with 3DCRT technique on whole-pelvic radiation cervical carcinoma by analyzing the distribution of dose or planning the target volume (PTV) coverage through homogeneity index (HI) and Conformity Index (CI) as well as the organ risk (OAR).This study uses 44 patient data in Installation Radiotherapy Hospital Dr. Soetomo with radiation planning 25x2 Gy of whole pelvic radiation with two planning techniques using the box 3DCRT and IMRT techniques on the angle of rotation 0, 180, 270, and 90 degrees, and then compare the Dose Volume Histograms (DVH) coverage on PTV, rectum and bladder. CI values for the 3DCRT technique (0.812 ± 0.067) and the IMRT technique was (0.799 ± 0.088) values obtained by t test (p = 0.405), whereas for the HI value for 3DCRT technique (1.075 ± 0.079) and the IMRT technique for (1.075 ± 0.079) with values (p = 0.219). Both CI and HI values are not significant. Comparison of percentage of dose on the risk of organ rectum with 3DCRT and IMRT techniques consecutive (80.56 ± 11.21) and (68.14 ± 8.01) with the value (p = 0.00), whereas for bladder organ 3DCRT techniques and consecutive IMRT (80.52 ± 9.22) and (71.94 ± 7.65) with the value (p = 0.00). There is significant value in the percentage of the dose in the rectum and bladder Keywords: Whole pelvic, IMRT, 3DCRT, HI, CI
BERKALA FISIKA
2014-10-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9295
BERKALA FISIKA; 2014: Berkala Fisika Vol. 17 No. 4 Tahun 2014; 121-128
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9295/7507
oai:ojs.ejournal.undip.ac.id:article/3066
2012-04-07T08:46:56Z
berkala_fisika:RA
ANALISIS FENOMENA ELECTROHYDRODYNAMIC PADA PERMUKAAN MINYAK SILIKON (CAIRAN DIELEKTRIK) MENGGUNAKAN SISTEM PEMBANGKIT PLASMA LUCUTAN PIJAR KORONA NEGATIF DENGAN ELEKTRODA BERKONFIGURASI TITIK BIDANG
Nur, Muhammad
Anam, Choirul
Arisa, Betri
An analysis of Electrohydrodynamic (EHD) phenomenon deformation of oil silicon surface has been done.The negative corona glow discharge plasma in this research is generated by plasma generator system in point to plane electrodes configuration. The first step of experiment is to determine correlation of voltage and electric current, and correlation of distance between electrode and electric current. Then, the second is to determine correlation of voltage and hole radius of oil silicon surface, and corelation of distance between electrode and hole radius of oil silicon surface. Finally, it is to determine the velocity hole for back to initial position of oil silicon surface after turn off electric field. The EHD phenomenon of oil silicon can be generated by impose of non homogeneous high electrics field. The voltage of corona at distance between electrodes 1 cm, 1,5 cm and 2 cm are 2,6 kV-4 kV, 3,4 kV-5,2 kV, and 3,8 kV-6,0 kV respectively. The increase of electrics field intensity influence dipole moment strength, it increases the radius of the hole of oil silicon surface. The increase of distance between electrode influence parabolic angle of electrics line field then cause the increase of hole radius. After this, if the electric field is zero with increasing voltage, velocity hole of oil silicon for back to initial position slower then if the increasing of h, that makes the velocity hole for back to initial position faster. Key words: Electrohydrodynamic, Silicon Oil, Dielectric polarization, Positive corona glow discharge plasma, ionic wind.
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3066
BERKALA FISIKA; Vol 10, No 2 (2007): Berkala Fisika; 87-92
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3066/2747
oai:ojs.ejournal.undip.ac.id:article/2706
2012-03-29T15:32:53Z
berkala_fisika:RA
Efektivitas Polyvinyl Acetate (PVAc) Sebagai Matriks Pada Komposit Sampah
Masturi, Masturi
Mikrajuddin, Mikrajuddin
Khairurrijal, Khairurrijal
It was fabricated a composite using solid waste as filler and polyvinyl acetate (PVAc) as matrice. This work is as a solution of more serious solid waste problems. The solid waste used is paper waste and leaf one with their composition are 60% and 40% respectively. The crushed-solid waste then hot-pressed at 100 MPa of pressure and 150°C of temperature. Then, the compressive strength of composite before and after PVAc presence was investigated to get a composition in which the compressive strength is optimum. Keywords: composite, solid waste, polyvinyl acetate, compressive strength.
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2706
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika; 61-66
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2706/pdf
oai:ojs.ejournal.undip.ac.id:article/10836
2016-04-21T12:15:24Z
berkala_fisika:RA
PEMETAAN PERCEPATAN GETARAN TANAH MAKSIMUM MENGGUNAKAN PENDEKATAN PROBABILISTIC SEISMIC HAZARD ANALYSIS (PSHA) DI KABUPATEN KEPAHIANG PROVINSI BENGKULU
Hadi, Arif Ismul
Brotopuspito, Kirbani Sri
peak ground acceleration, PSHA, red zone and Sumatran Fault of Musi Segment.
This study aims to analyze and map the peak ground acceleration using the approach of Probabilistic Seismic Hazard Analysis (PSHA) in the area. Earthquake catalog data obtained from BMKG, ISC and USGS began in 1914 until 2014. Declustering process using ZMAP ver.6 software. Identification and modeling of the seismic source uses three models of seismic sources: (1) to subduction earthquake source, (2) the source of the earthquake fault and (3) the source of the quake background. Parameters a-value and b-value is obtained by the Gutenberg-Richter recurrence law and maximum likelihood method, whereas the determination of the attenuation function and logic tree refers to the Revision Team of Indonesia Earthquake 2010. Peak ground acceleration values obtained using USGS-PSHA-07 software. The results showed that the value of the peak ground acceleration in the Kepahiang District for probability exceeded 10% and 2% in the 50 year design life of the building is 0.15 – 0.8 g and 0.25 – 1.3 g. Areas that are the red zone is the Ujan Mas Sub-district, Kepahiang Sub-district, Tebat Karai Sub-district, Seberang Musi Sub-district and Bermani Ilir Sub-district, while the regions are relatively safe from the red zone is the Merigi Sub-district, Kabawetan Sub-district and Muara Kemumu Sub-district. Red zone is an area adjacent to the Sumatran Fault of Musi Segment. Keywords: peak ground acceleration, PSHA, red zone and Sumatran Fault of Musi Segment.
BERKALA FISIKA
2015-07-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/10836
BERKALA FISIKA; 2015: Berkala Fisika Vol. 18 No. 3 Tahun 2015; 101-112
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/10836/8571
oai:ojs.ejournal.undip.ac.id:article/3082
2012-04-07T12:32:41Z
berkala_fisika:RA
Pengukuran Tebal Kontaminasi Zat Radioaktif pada Permukaan Tanah Secara In Situ Menggunakan Spektrometer Gamma Portabel
Wijianto, Wijianto
Azam, Much.
Setiawati, Evi
Bunawas, Bunawas
Determination of contamination’s thickness on the ground for homogeneous source compound Cs -137 and Co-60 use portable gamma spectrometry with height purity germanium detector ( HPGe detector) have been done.There are two methods to determine contamination’s thickness on the ground surface. The first method is Korun’s modification by looking for the total count of gamma ray before and already to experience attenuation for Cs-137 and Co-60 then divided by the decrease of linear attenuation coefficient Cs-137 and Co-60. The second is Xu comparison method by made variation of distance from ground surface to detector surface then compared with total count of gamma ray from one source Cs-137 or Co-60 during counting time. The results from experiment obtained for Korun’s modification for the actual thickness 10 cm, 20 cm and 24 cm have an error at 2 % , for actual thickness 12 and 16 cm,and an error at 3 %, for actual thickness 6 cm and 8 cm an error of 4 % and, for actual thickness 4 cm have an error at 9 %. Then for the Al Ghamdi to Xu Comparison method, for Co-60 in the actual thickness 6 cm and 10 cm have error 3 % and 12 %, and for Cs-137 in the actual thickness 10 cm and 6 cm have error 9 % and 48 %. Key words: HPGe detector, portable gamma spectrometry, contamination, Korun’s modification and Xu comparison method.
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3082
BERKALA FISIKA; Vol 9, No 4 (2006): Berkala Fisika; 197-201
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3082/2763
oai:ojs.ejournal.undip.ac.id:article/2821
2012-03-29T12:12:25Z
berkala_fisika:RA
MEASUREMENT OF VISCOSITY AND SUCROSE CONCENTRATION IN AQUEOUS SOLUTION USING PORTABLE BRIX METER
Hidayanto, Eko
Tanabe, Teruo
Kawai, Jun
The viscosity of aqueous sucrose solution in various concentrations and the sugar content were measured by using an Ostwald viscometer and a commercial available of portable Brix meter respectively. The increasing of the concentration of sucrose would also followed by increasing viscosity of the solution. Depending on their concentration, the measured value of viscosity of solution would be automatically confirmed into the desired concentration unit. The suitability of Brix meter for other application will be checked.
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2821
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus; A23-A28
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2821/pdf
oai:ojs.ejournal.undip.ac.id:article/23877
2019-06-25T14:23:18Z
berkala_fisika:RA
SISTEM PENDINGIN MENGGUNAKAN THERMO-ELECTRIC COOLER DENGAN KONTROLER PROPORTIONAL-INTEGRALDERIVATIVE
Indrawan, Wisnu
Suryono, Suryono
Cooling, thermoelectric, gas, controller, temperature
The cooling is one of the processes can be used for various types of applications, starting from maintaining food industry products and medical products such as drugs and vaccines. The cooling process now still uses compression-based preservation technology using cooling gas. The types of cooling gas used are R134a and R600a, however the R134a contains HFCs which has been banned for used and the R600a contains HF gas which can reduce the ozone layer. The current study designed hardware and software that is applied to thermoelectric coolers(TEC), i.e. it was designed a device used for the air conditioning system using a thermoelectric cooler with a Proportional Integral Derivative (PID) controller. This system used several tools such as temperature sensors, transistor with TIP31 type, bluetooth module, fan, and ATSAM3X8E microcontroller. In this study, temperature control was carried out based on the desired set-point temperature and temperature of the sensor. From this study, it can be found that the greater value of the voltage given, the greater the value of the Pulse Wave Modulation (PWM) will be produced. The higher value of PWM, the faster the temperature decreases in the cooler. From several tests, it can be concluded that the values of proportional control parameter (Kp) of 2.55, integral control parameter (Ki) of 100 and deferential controlparameter (Kd) of 200, more stable graph is obtained and close to the set-point value, with anerror value of 2.86%.Keywords : Cooling, thermoelectric, gas, controller, temperature
BERKALA FISIKA
2019-06-24
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/23877
BERKALA FISIKA; Vol 22, No 2 (2019): Berkala Fisika Vol. 22 No. 2 Tahun 2019; 68-76
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/23877/15394
Copyright (c) 2019 BERKALA FISIKA
oai:ojs.ejournal.undip.ac.id:article/3099
2012-04-07T12:39:36Z
berkala_fisika:RA
DETERMINATION ROCK DENSITIES OF ULUBELU GEOTHERMAL LAMPUNG BY USING GRAVITY METHOD COMBINED WITH BOREHOLE METHOD
Suharno, Suharno
Danusaputro, Hernowo
The Ulubelu geothermal system is located within Tanggamus volcanism. Rock densities were measured from wells Rendingan (Rd), Kukusan I (Kk1), Kukusan II (Kk2), Ulubelu II (UBL2) and Ulubelu III (UBL3). A terrain density estimate was made across line GG’ using the Nettleton method. The measured densities results, show values ranging between 2.60 x 103 kg m-3 and 2.70 x 103 kg m-3. The density estimated profile is presented in Figure 2 shows the density of about 2.70 x 103 kg m-3. Combined with the results from the laboratory measurements of borehole samples and density estimated, those suggest as the mean density of upper continental crust commonly used for the reduction of Bouguer anomalies (2.67 x 103 kg m-3).
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3099
BERKALA FISIKA; Vol 9, No 2 (2006): Berkala Fisika; 85-91
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3099/2780
oai:ojs.ejournal.undip.ac.id:article/2897
2012-03-29T15:41:13Z
berkala_fisika:RA
Simulasi Pencitraan Ultrasonografi (USG) Menggunakan PdeTool Matlab
Anam, Choirul
Diagnostic imaging with ultrasound is based on the mechanical properties of an object. To evaluate how the ultrasound wave propagates in an object and imaging of the object, can be done with simulation techniques. Simulation of ultrasound wave propagation was performed using Matlab pdetool. The simulation was conducted to determine the image quality due to the influence from variation of the object, variations in the number of objects, various types of objects and variations in frequency of the signal. From the simulation showed that the ellipse and box objects can be distinguished. If the number of object is increased, will cause the image more complex. This happens because the waves are about an object, it would interfere with ultrasound waves that will be used to image the next object. If two objects have different c is high enough, then the imagery on the field boundary of two mediums was very clear. Conversely, if the difference is very small c, then the boundary of two mediums were not visible. If the frequency rises, causing axial resolution increase, but cause increased attenuation. Keywords: USG, Simulation, pdetool Matlab
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2897
BERKALA FISIKA; Vol 12, No 3 (2009): Berkala Fisika; 107-114
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2897/2580
oai:ojs.ejournal.undip.ac.id:article/4978
2013-05-27T11:13:34Z
berkala_fisika:RA
SISTEM PENGENALAN WAJAH DENGAN METODE EIGENFACE DAN JARINGAN SYARAF TIRUAN (JST)
Mulyono, Tri
Adi, Kusworo
Gernowo, Rahmat
The development of security systems led to the development of face recognition system using image processing techniques.Research was conducted to identify a face image automatically with theeigenface method. The method used is a normalization, eigenface, neural network training and testing.Eigenface is used to reduce the dimension vector face becomes much simpler (eigen vector). Eigen vectorsobtained are used by back propagation neural network training process and recognition. Then do thetesting process using the image of a face that has not been used in the training process.The results showed the use of neural networks and eigenface to face recognition can give a goodaccuracy. The system is able to produce an acuracy of 84.6% with a FAR (False Acceptance Rate) =16.2%, FRR (False Rejection Rate) = 20% and EER (Equal Error Rate) = 0.3.Keywords : face recognition, eigenface, eigen vector, neural network
BERKALA FISIKA
2012-01-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4978
BERKALA FISIKA; Vol 15, No 1 (2012): Berkala Fisika; 15-20
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4978/4511
oai:ojs.ejournal.undip.ac.id:article/2936
2012-03-30T15:03:29Z
berkala_fisika:RA
Estimasi Penyebaran Sedimen Cekungan Jawa Timur Dengan Metode Gravity
Adib Hasan, Muhamad
Nurwidyanto, M. Irham
This research is a reconnaissance study to predict the distribution and depth of the sediment basin in East Java based on Bouger Anomaly data in gravity method.Bouger anomaly is projected to flat plane used by equivalent point mass source method. Upward continuation is used to separate the regional and residual anomaly. Modeling sub surface in two dimensions are used by polygon Talwani method by help computer program Geomodel.The results of this research can be concluded that in East Java sediment basin has about 6 km in depth. The central basin are reside in mid of East Java, there are around Sragen, Karanganyar, Ngawi, Madiun, Nganjuk, Kediri, Bojonegoro, Jombang and Mojokerto which in the east west direction. In the eastern part of East Java Basin there are Sidoarjo, Pasuruhan, Probolinggo and Maura bay has direction in northwest to southeast. Key words: Basin, basement, sediment, Bouger Anomaly
BERKALA FISIKA
2012-03-30
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2936
BERKALA FISIKA; Vol 11, No 4 (2008): Berkala Fisika; 137-145
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2936/2624
oai:ojs.ejournal.undip.ac.id:article/4996
2013-05-27T16:00:48Z
berkala_fisika:RA
SIFAT ELEKTROOPTIS SEBAGAI PARAMETER INDIKASI MUTU BERBAGAI JENIS MINYAK GORENG KEMASAN
Murni, Sri
Firdausi, K Sofjan
Hidayanto, Eko
Bawono P, Ari
Abstract In this paper, we introduce the change of polarization angleβ induced by external electric field, as a quality indication of several edible oils without preliminary treatment. The averagevalue ofβ in the interval of applied potential difference plays important role as level of number offree radicals produced in the edible oils. The samples used were olive oil, extra olive oil, palm oil,and corn oil. Theβ value was obtained by measurement of the change polarization angle as the function of magnitude the electric field on the samples. The electric field was produced by DCvoltage power supply on two parallel plates in a separated distance of 2.5 cm and in area of 5 cm× 3 cm. The source of light used was He-Ne laser 1 mW (λ=633 nm). The experiment result showsthat for all the fresh frying oil samples the polarization angle has value between 2.3× 10/V and3.3× 10-4 0/V in the experimental condition. The extra olive oil has the smallest value while palmoil has the greatest. According to the previous study, the olive oil is relatively the best oil.Keywords: frying oil, electrooptics, polarization angle
BERKALA FISIKA
2012-10-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4996
BERKALA FISIKA; Vol 15, No 4 (2012): Berkala Fisika; 119-122
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4996/4529
oai:ojs.ejournal.undip.ac.id:article/2993
2012-04-03T15:26:37Z
berkala_fisika:RA
Simulasi Penelusuran Berkas Cahaya pada Lensa Tipis
Edi Wibowo, Catur
A program to simulated trace the beam of light have been done with Python programming language version 4.2. Program was simulated trace the beam of light in the convergen lens and divergen lens. Program was constuct by functions of canvas, create line, button and motion in object oriented programming Python. Object simulation is the convergen lens and divergen lens with focus 10 cm and hight of object 4 cm.The result of simulation is graphical user interface with mouse interaction. The trace of beam of light indicate that this simulation is according to theory.
BERKALA FISIKA
2012-04-03
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2993
BERKALA FISIKA; Vol 11, No 1 (2008): Berkala Fisika; 19-22
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2993/2677
oai:ojs.ejournal.undip.ac.id:article/5009
2013-05-27T16:22:39Z
berkala_fisika:RA
INVERSI LINIER LEASTSQUARE DENGAN MATLAB ( Studi Kasus Model Gravitasi Bola Berlapis)
Nurwidyanto, Irham
Setiawan, Ari
The linear least square Inversion have been made with matlab8 for a case study of layered ball with the aim to study the response of the gravitational field of a layered ball.The gravitational field of layered ball formulation described later the value is calculated by programming in matlab. As the validation data is computed on the surface of the earth'sgravitational field with a case of six layers with different density and radius. The value aresuitable to the real slate. After the results are appropriate, the results of programming was made is used to calculate the gravitation field of another layered ball object, the data is then used assynthetic data (considered as a data field) which is an inversion of input data on the program aremade.The results obtained in this modeling can be concluded that there are ambiguity from theinversion results, which means that the parameters which be obtained from the invertion methodare very different to the riil parameter if not given early predictive value as the limit of theexpected value. By providing a limit value (the value of the initial estimate) the expected results ofthe inverse can provide results that correspond (nearly) true value.Key words: Inversion, Linier leastquare, layered ball
BERKALA FISIKA
2012-07-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5009
BERKALA FISIKA; Vol 14, No 3 (2011): Berkala Fisika; 93-100
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5009/4542
oai:ojs.ejournal.undip.ac.id:article/3004
2012-04-04T07:39:08Z
berkala_fisika:RA
Kajian Hasil Pembuatan Tiga Macam Ukuran Lubang Berbentuk Persegi Panjang Pada Tubuh Tungku Sekam
Darmasetiawan, H.
Irzaman, Irzaman
Demijati, Demijati
Siswadi, Siswadi
Husk furnace is used for cooking fuel chaff with the aid of air flow in the furnace. One measurement of the husk furnace efficiency can be studied by varying the size of the primary air holes on the body of the furnace. In this study, a hole measuring 22 cm X 24 cm obtained by the rate of fuel consumption of 6.03 kg / hour of heat energy needed to boil water as much as 6 liters is 2575.00 kcal / h and 14.32% efficiency furnace. While in the hole measuring 22 cm X 8 cm and 22 cm X 16 cm, respectively 12.92% and 12.87% efficiency furnace, not significantly different. Keywords: chaff, husk furnace, ukuruan primary air hole, furnace efficiency
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3004
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus; C1-C4
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3004/2688
oai:ojs.ejournal.undip.ac.id:article/6180
2014-02-10T09:37:13Z
berkala_fisika:RA
PEMBUATAN KURVA ISODOSIS 2D DENGAN MENGGUNAKAN KURVA PERCENTAGE DEPTH DOSE (PDD) DAN PROFIL DOSIS DENGAN VARIASI KEDALAMAN UNTUK TREATMENT PLANNING SYSTEM
Nurul Ihya, Farhatin
Anam, Choirul
Gunawan, Vincensius
Treatment Planning System (TPS) is very necessary in radiotherapy planning to give the accurate radiation dose given to the patient. In the TPS, 2D isodose curve is used to determine thedose distribution with the same rate at a certain distance from the radiation source. The isodosecurve is obtained from the Percentage Depth Dose (PDD) and dose profile. Measurement data ofPDD and dose profiles obtained from Kensaras Hospital in Semarang. The PDD and dose profiledata were obtained from testing the water phantom for soft tissues such as muscles or other bodytissues. Dose profile curve which is used is at a various depth, such as: 1.5 cm, 5 cm, 10 cm, 15cm, 20 cm and 25 cm with an area of 5 x 5 cm2field, 10 x 10 cm2, 15 x 15 cm2, 20 x 20 cm, 30 x 30cm2 and 40 x 40 cm2. At each depth of curve profile, the dose at the surface is calculated andnormalized using interpolation and normalized by narrowing techniques. 2D isodose curveobtained from the weighting technique to the calculation of the dose profile curve. In the field sizeof 5 x 5 cm2 and 10 x 10 cm2, isodose curve formed better in the absence of horn at the edge of thecurve. In the field size larger than 10 x 10 cm2 there are horns on the edge of the curve at thelower depths.Keywords : Treatment Planning System (TPS), 2D Isodose curve, Percentage Depth Dose (PDD),Dose profile.
BERKALA FISIKA
2013-10-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/6180
BERKALA FISIKA; Vol 16, No 4 (2013): Berkala Fisika; 131-138
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/6180/5236
oai:ojs.ejournal.undip.ac.id:article/3044
2012-04-07T12:48:06Z
berkala_fisika:RA
Kajian Efektivitas Pembelajaran Fisika Dalam Meningkatkan Technological Literacy Dan Kreativitas Siswa Smp Melalui Implementasi Program Pendidikan Teknologi Dasar (PTD)
T. Chandra, Didi
This research is part of the development program of Technology Education Association (PTD) in junior high school, conducted to test the effectiveness of the PTD program in improving technological literacy and creativity of students. The study was conducted by comparing the learning of physics topics through dynamic power and non PTD PTD. The research method used was a quasi experimental research design with pretest-posttest matched control group design. The samples were students at two different schools but have the same academic homogeneity, with students in classroom learning physics experiments through PTD while controlling class of students in learning physics through non-PTD. The research instrument in the form of test device used to measure technological literacy, and creativity of students. The results showed convincingly that learning physics through PTD is more effective in improving technological literacy, and creativity of students as compared to learning physics through non-PTD. Keywords: PTD, Technological Literacy, Creativity.
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3044
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus; E15-E24
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3044/2726
oai:ojs.ejournal.undip.ac.id:article/8879
2015-08-01T18:11:54Z
berkala_fisika:RA
DEPOSISI LAPISAN TIPIS ZnO:Ag DAN APLIKASINYA UNTUK DEGRADASI POLUTAN ORGANIK
Anngita, Sheilla Rully
Sutanto, Heri
Zinc Oxide (ZnO) is a semiconductor material that is used for photo-catalyst to degrade organic pollutants. The addition of doping silver (Ag) in ZnO can increase the photo-catalytic activity in the degradation process. In this study, the addition of doping Ag in ZnO thin film on a glass substrate deposition using thermal spray coating method has influence on the micro-structure and photo-degradation in presence of bacteria Escherichia coli (E. coli) as an organic pollutants has been investigated. Micro-structure of ZnO : Ag layer were characterized by Scanning Electron Microscopy (SEM) and photo-degradation activities of bacteria were tested with Total Plate Counter (TPC). The results show that doping Ag in ZnO give affect the topography of the surface that can increase in amount of grains and grain size in order to increase the photo-catalytic activity. It indicated by decrease in amount of E. coli bacteria from the initial sample with percentage of degradation is 99,99951% Keyword: Semiconductor, photo-catalyst, ZnO, doping Ag, micro-structure, photo-degradation
BERKALA FISIKA
2014-07-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/8879
BERKALA FISIKA; 2014: Berkala Fisika Vol. 17 No. 3 Tahun 2014; 85-90
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/8879/7214
oai:ojs.ejournal.undip.ac.id:article/3061
2012-04-07T08:44:22Z
berkala_fisika:RA
Interpretasi Bawah Permukaan Dengan Metode Self Potential Daerah Bledug Kuwu Kradenan Grobogan
Dwi Indriana, Rina
Nurwidyanto, M. Irham
W. Haryono, Kurnia
The geophysics research to observe the subsurface anomaly in Bledug Kuwu had been done. It was used to analyze and interpret the potential data. The purpose of this research was to interpret the object of subsurface anomaly. The research was used self potential method with base point electrode configuration. Data processed used Surfer 8 software, which result was an isopotential contour map. The modeling processed used curve matching for a spherical model. By using Bhattacharya theory, the depth and polarization angle was founded as the parameter of a spherical model. The research’s result of the depth of anomaly origin is 19,5 m, 23,68m, and 40,8 m. The polarization angle is 70o, 70,38o and 100o. Keywords: Bledug Kuwu, self potential, spherical model
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3061
BERKALA FISIKA; Vol 10, No 3 (2007): Berkala Fisika; 155-167
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3061/2742
oai:ojs.ejournal.undip.ac.id:article/2457
2012-03-29T14:43:26Z
berkala_fisika:RA
Studi Konduktivitas Listrik Film Tipis Ba0.25Sr0.75TiO3 Yang Didadah Ferium Oksida (BFST) Menggunakan Metode Chemical Solution Deposition
Irzaman, Irzaman
Erviansyah, R
Syafutra, H
Maddu, A
Siswadi, Siswadi
Has done growth Ba0,25Sr0, 75TiO3 (BST) thin film and BST are pure Ferium Oxide Fe2O3 dopant (BFST) with dopant variations 5%, 10% and 15% above the substrate Si (100) type-p using Chemical Solution Deposition Method (CSD) with the spin coating technique at a speed of around 3000 rpm for 30 seconds. BST thin films made with 1 M concentration and annealing at a temperature of 850°C for Si Substrate. Thin film on silicon substrate type-p thickness characterization performed using the volumetric method and the characterization of electrical conductivity by using LCR meter. From the characterization results showed the thickness increases with the addition of ferium oxide dopant given. Electrical conductivity value of BST and BFST thin films are in the range semiconductor materials and electrical conductivity values obtained increased when the higher intensity light is used whereas resistance value could decrease if the light intensity is increased. The addition of ferium oxide dopant will increases electrical conductivity value of BST and BFST thin films. Keywords : BFST, thin film, CSD, spin coating, electrical conductivity
BERKALA FISIKA
2012-03-19
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2457
BERKALA FISIKA; Vol 13, No 1 (2010): Berkala Fisika; 33-38
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2457/pdf
oai:ojs.ejournal.undip.ac.id:article/9667
2015-12-08T10:02:22Z
berkala_fisika:RA
GENERATOR PEMBANGKIT PLASMA DENGAN KONFIGURASI ELEKTRODA BATANG TIPIS DAN JARUM
Wardaya, Asep Yoyo
Nur, Muhammad
plasma generator, thin rod and needle configuration electrodes, electric field, saturated current.
The application of plasma generator has been developed for everyday live because it can generate high electric field and induced current, even by only 12 volt of potential difference. The advantages of the plasma generator are mainly caused by configuration form of its electrodes which is usually very sharp and asymmetric form. In this paper, plasma generator has been discussed using electrodes configuration of the thin rod and needle in two dimensional planes. The result shows that the plasma generator can produce various high electric fields, which highest field at the tip of needle electrode. In case of configuration of needle electrode, it will be produced saturated current due to their asymmetric electrodes, while in case of thin rod electrode; it will be no saturated current due to symmetric electrode. Keywords: plasma generator, thin rod and needle configuration electrodes, electric field, saturated current.
BERKALA FISIKA
2015-04-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9667
BERKALA FISIKA; 2015: Berkala Fisika Vol. 18 No. 2 Tahun 2015; 67-74
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9667/7743
oai:ojs.ejournal.undip.ac.id:article/3077
2012-04-07T12:30:24Z
berkala_fisika:RA
Analisis Atribut Seismik untuk Identifikasi Potensi Hidrokarbon
Maulana Hadi, Johan
Nurwidyanto, M. Irham
Yulianto, Gatot
Rms amplitude and spectral decomposition attribute have been extracted for hydrocarbon potential identification in Amandah area, Talangakar Formation, North West Java Basin. Purpose of rms amplitude extractions is to see the change of lithology which is extreme. Example is like reservoir existence. Spectral decomposition has been used to see reservoir at thin thickness. The seismic attributes has been extracted from seismic data 3D Pre Stack Time Migration (PSTM). Log data has been taken from a well (AMD-01) to interpret and determine reservoir thickness in interest zone. Seismic attribute analysis has been used to see existence and shape of channel’s geometry spreading. The result of rms amplitude attribute extraction is reservoir which can be detected clearly at 10 ms, 20 ms, 30 ms and 40 ms window analysis. Whereas the result of spectral decomposition attribute extraction is reservoir which can be detected at 15 Hz – 25 Hz frequency with 30 ms and 40 ms window analysis. The result of rms amplitude and spectral decomposition attribute analysis shows hydrocarbon in Amandah area, Talangakar Formation is potential in channel depositional facies with depositional direction at north-south (N-S) and north nort east – south south west (NNE-SSW) and thickness high of channel is concern at 36-60 m. Key words: Seismic attribute, rms amplitude, spectral decomposition, reservoir,
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3077
BERKALA FISIKA; Vol 9, No 4 (2006): Berkala Fisika; 165-170
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3077/2758
oai:ojs.ejournal.undip.ac.id:article/2796
2012-03-29T11:53:51Z
berkala_fisika:RA
PENCITRAAN RESISTIVITAS 2D BAWAH PERMUKAAN TANAMAN JATI (Tectona Grandis Sp.) MENGGUNAKAN KONFIGURASI WENNER (STUDI KASUS: LAHAN TANAMAN JATI DI BELAKANG GEDUNG MIPA UNSOED)
Sehah, Sehah
Sugito, Sugito
Two dimensional (2D) resistivity survey was conducted on a teak field behind the MIPA building of UNSOED, Purwokerto. The purpose of this research was to know the subsurface condition of the teak field, so that can also determine the suitability of the field to teak plant. The survey was conducted using resistivity-meter NANIURA type NRD 22S. The type of configuration was used is Wenner, with a minimum electrode spacing of two meters and maximum of ten meters. The measurement conducted for three tracks, namely LJ1, LJ2 and LJ3 with length of them self are 64 meters, 70 meters, and 40 meters, with relatively flat topography at an altitude of 110 meters above sea level. Data processing was done using RES2DINV 3.57.37 software that the result is a 2D-image of subsurface resistivity. The depth is obtained for each track is 5.37 meters. Interpretation of hydrogeology refers to local geological information. The result of interpretation is digitized using Arc-View GIS 3.3 in order to obtain final result that is hydro-geological images. The result of research show that at the LJ1 and LJ3 contain two layers of rock, there is sandy soil and clayey sand. At the LJ2 track there are three layers, sandy soil, clayey sand, and sand. The resistivity value of sandy soil is 79.4 – 193.0 Ωm, resistivity of clayey sand is 18.9 – 83.4 Ωm and resistivity of sand is 15.7 – 31.8 Ωm. The more downward tendency of resistivity value is more smaller, which indicates more water content. The results of research show that the layers of rock which is found in the land of teak is sandy soil, clayey sand and sand. According to the reference, the entire layer of rock is less than optimal to plant teak. Keywords: 2D-resistivity, land of teak plant, sub surface, Wenner configuration.
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2796
BERKALA FISIKA; Vol 14, No 1 (2011): Berkala Fisika; 1-10
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2796/pdf
oai:ojs.ejournal.undip.ac.id:article/23482
2019-06-25T13:52:35Z
berkala_fisika:RA
RANCANG BANGUN SISTEM KENDALI PID UNTUK INTENSITAS CAHAYA LAMPU DC MENGGUNAKAN MIKROKONTROLER ARDUINO UNO
Tanza, Nendya Ertika
Sumariyah, Sumariyah
BH1750, DC lights, microcontroler, PID, PWM
The design of PID (Proportional Integral Derivatives) control system has performed for DC light intensity using an Arduino Uno microcontroller. This research aims to create a DC light intensity control system automatically using Arduino Uno, test the design light intensity control system using PID control and test the stability response of the light intensity control system before and after being given interference in the form of obstructions and external light. The method used in this research is Ziegler-Nichols 1 method to obtain the PID constant. The BH1750 sensor is converted to a digital signal by the BH1750 converter and transmitted to the Arduino Uno microcontroller chip via the I2C interface. The PID constant resulting from the Ziegler-Nichol method approach is used for the experimental approach to manual tuning and determining the cycle of Pulse Width Modulation (PWM). The results of this research obtained 82,42% system accuracy and PID constant, is KP = 0,1; KI = 2,0 andKD = 0,00000102. The built-in lamp light intensity control system is able to stabilize due to interference in an average time of 1 second at 400 lx setpoint.Keywords : BH1750, DC lights, microcontroler, PID, PWM
BERKALA FISIKA
2019-05-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/23482
BERKALA FISIKA; Vol 22, No 1 (2019): Berkala Fisika Vol. 22 No. 1 Tahun 2019; 32-40
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/23482/15170
Copyright (c) 2019 BERKALA FISIKA
oai:ojs.ejournal.undip.ac.id:article/3094
2012-04-07T10:34:26Z
berkala_fisika:RA
Pemanfaatan Tempurung Kelapa Sebagai Bahan Baku Arang Aktif dan Aplikasinya Untuk Penjernihan Air Sumur di Desa Belor Kecamatan Ngaringan Kabupaten Grobogan
Suhartana, Suhartana
Waste Piece of Coconut shell used in society often only used upon which burn or firewood. Some furniture industries minimize there, exploited as a tool of physic educative and souvenir. In other hand, can be taken away from piece of coconut shell could to raw material of active charcoal. Chemical content of active charcoals is carbon compound, is very good for process of liquid material purification, inorganic and also organic material goodness. In this research is existing active charcoal, used to make clear ground water at Belor Ngaringan Grobogan District. Result after treatment by active charcoal pH, hardness, salinity, biologycal oxygen demand and chemical oxygen demand were decrease. Keyword: piece of coconut shell, active charcoal, liquid material purification.
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
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https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3094
BERKALA FISIKA; Vol 9, No 3 (2006): Berkala Fisika; 151-156
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3094/pdf
oai:ojs.ejournal.undip.ac.id:article/2875
2012-03-29T14:25:06Z
berkala_fisika:RA
Pengaruh Laju Molar Mn Larutan Terhadap Mikrostruktur Lapisan Tipis GaN:Mn yang Dideposisi di atas Substrat Si Menggunakan Metode Sol-Gel
Sutanto, Heri
Hidayanto, Eko
Nurhasanah, Iis
Istadi, Istadi
A thin layer of material deposition of GaN: Mn by sol-gel method has done using spin-coating technique. Solution of gallium-citrate-amine maganese-Ga2O3 synthesized using as a source of Ga and Mn MnO2 as the source. Solution varied with the mole fraction solution of 60-80% Mn. Brown crystals that formed subsequently dissolved in ethylenediamine to form a gel. Subsequent gel superimposed on top of Si substrates with a spin-coater at a rate of 1100 rpm. Layers formed at temperatures of 900oC and then disintering in UHP N 2 gas environment to form the decomposition of GaN: Mn. The results of spectral analysis of energy dispersive X-ray (EDX) showed incorporation of Mn into the GaN mole fraction increased with the addition of a solution of Mn in the solution used. EDX Test results show that thin films of GaN: Mn impurity contained carbon (C) up to 36.71%. Image scanning electron microscopy (SEM) a thin layer of GaN: Mn shows in general have been obtained surface roughness (rms) morphology of the layer reaches the order of nanometers up to 24.36 nm. From the results already obtained show that the sol-gel deposition method has been able to produce a thin layer of magnetic semiconductors with a nearly homogeneous surface morphology. Thus the sol-gel method could be developed for alternative methods of deposition of thin layers that are economical and simple. Key words: GaN: Mn, CSD, Thin Layer, Mn incorporation.
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
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https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2875
BERKALA FISIKA; Vol 14, No 2 (2011): Berkala Fisika; 63-70
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2875/2558
oai:ojs.ejournal.undip.ac.id:article/4973
2013-05-27T11:15:31Z
berkala_fisika:RA
KOMPARASI KUALITAS CITRA HASIL REKONSTRUKSI METODE ALGEBRAIC RECONSTRUCTION TECHNIQUE (ART) ADITIF DAN MULTIPLIKATIF (MART) PADA CT SCAN
Anam, Choirul
Firdausi, K Sofjan
AbstractImage recontruction for CT scan by the methods of additive ART and muliplicative ART (MART) have been carried out using Malab software. The object used is Sheep-Logan phantomwith matrix size 50x50, used a paralel beam and angle interval 10, 50, 10,respectively. It is obtained that additive ART produces many artifacts, while MART producesfewer artifacts. Additive ART produces a contras between objects and background with relativelyhigh, while MART produces relatively lower contrast. It is obtained that in the additive ART,interval angle affects the quality of image. This does not happen to MART. So, the MARTreconstruct CT image faster, because it can be obtained relatively good image despite the angleinterval is large.Keywords: Image reconstruction, Additive ART, Multiplicative ART (MART)
BERKALA FISIKA
2011-10-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4973
BERKALA FISIKA; Vol 14, No 4 (2011): Berkala Fisika; 123-128
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4973/4506
oai:ojs.ejournal.undip.ac.id:article/2932
2012-03-30T14:29:24Z
berkala_fisika:RA
PENENTUAN SOLUSI NUMERIK PERSAMAAN BKdV DENGAN METODE BEDA HINGGA
Sehah, Sehah
Aminuddin, J.
The innovative knowledge for modelling of the wave propagation is solitary waves. The dynamical model of solitary wave represented in Korteweg de Vrise (KdV) equation form. In this modelling assumed that the KdV equation has not perturbation sign, so called Basic Korteweg de Vries (BKdV) equation. This modelling begins from expressing of the BKdV equation into to discrete form as its linear form using implicit scheme for finite difference method. Then, it linear form constructed into matrix form. The solution of matrix form determined using Gauss-Jordan method for resulting of the numerical solution of the BKdV equation. numerical solution was representing on the surface-graphic for the wave envelope as representation of the dynamical non linear in the water. This modelling results indicating that the wave envelope was has distortion of initial amplitude on longstanding of time. It indicate that the fluid energy was has distortion on longstanding of time. Key Word: Soliton, KdV, Numerical, Wave, Envelope
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2932
BERKALA FISIKA; Vol 12, No 1 (2009): Berkala Fisika; 27-33
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2932/pdf
oai:ojs.ejournal.undip.ac.id:article/4990
2013-05-27T16:03:07Z
berkala_fisika:RA
MODEL ARIMA UNTUK PREDIKSI CURAH HUJAN STUDI KASUS SEMARANG JATENG
A Rofik, Muchammad
Gernowo, Rahmat
Setyawan, Agus
Nursamsiah, Nursamsiah
Modeling and prediction of rainfall in 2010 in Central Java BMKG Climatological Station has been done with ARIMA approach. The goal is to determine the historical pattern of the dataand then extrapolates this pattern into the future based on the assumption of continuity. Rainfalldata of 2000-2009 is a time series that can be predicted into the future using ARIMA. In thisstudy using two approaches for prediction of rainfall in 2010. The results were correlated with aprediction of rainfall data observed in 2010. Obtained a correlation of 71.1% and 75.48%.Keywords: ARIMA, rainfall, predictions, models
BERKALA FISIKA
2012-07-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
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https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4990
BERKALA FISIKA; Vol 15, No 3 (2012): Berkala Fisika; 91-94
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4990/4523
oai:ojs.ejournal.undip.ac.id:article/2980
2012-04-03T12:35:00Z
berkala_fisika:RA
Variasi Nilai Eksposi Aturan 15 Persen pada Radiografi Menggunakan Imaging Plate untuk Mendapatkan Kontras Tertinggi
Sartinah, Sartinah
Sumariyah, Sumariyah
Ketut Umiati, N. Ayu
The study about implementation of 15 % rule for getting the highest contrast of radiograph from Computed Radiography has been done.Computed Radiography that has been used in this research was Diagnost 65 Equipment with Step wedge as object, Imaging Plate as the storage system of digital data that will be treated to become image. Diagnost 65 Computed Radiography was operated with exposure factors such as; 50 kV/80 mAs, 60 kV/40mAs, 80 kV/10 mAs, 100 kV/2.5 mAs and 110 kV/1.25 mAs with plus and minus variation of 15 % voltage. Print out Radiograph by using Laser Printer was measured its densities by using densitometer. Value of densities and contras of exposure standard were compared with value of densities and contras of exposure with plus and minus variation of 15 % rule. By using contras obtained, the highest contrast was identified.The Results research show trend of densities value; its increase thick step wedge hence the density is smaller and increase thin step wedge hence the ever greater density. Highest radiograph contrast value got at various value exposure with voltage drop of tube 15% with twice of the current was multiplied the time. From this research yielded spread implementation of 15 % rule for computed radiography at various the exposure factors 60 kV-110kV. Keywords: 15%-rule, radiograph contrast
BERKALA FISIKA
2012-04-03
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
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https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2980
BERKALA FISIKA; Vol 11, No 2 (2008): Berkala Fisika; 45-52
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2980/2664
oai:ojs.ejournal.undip.ac.id:article/2999
2012-04-04T07:35:57Z
berkala_fisika:RA
Model Panel Surya Cerdas Dengan Sensor Pelacak Cahaya Matahari Otomatis Berbasis Mikrokontroler
Harjunowibowo, Dewanto
This research aims to create a model of intelligent solar panels are able to follow the movement direction of the sun as an energy source based on microcontroller AVR ATMEGA. This study uses ATMEGA AVR microcontroller 16bit with injection of fuzzy logic programs. The system also created using 4 (four) sensors LDR and 5 (five) photodiode sensor. Integration of fuzzy logic, AVR ATMEGA and sensors capable of providing optimal results into a dynamic model of the solar panels that automatically and can be applied on a large scale. The results of this study is a prototype solar panel that is able to follow the movement direction of the sun based on microcontroller AVR ATMEGA 16. The solar panels model is capable of putting solar panel surface perpendicular to the direction of sunlight intensity can be detected along the sensor. Keywords: smart panel, microcontroller, fuzzy logic, sensor
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2999
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus; B7-B14
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2999/2683
oai:ojs.ejournal.undip.ac.id:article/5263
2013-08-01T09:45:41Z
berkala_fisika:RA
OPTICAL AND MAGNETIC PROPERTIES OF TeO2⋅ZnO⋅Li2O GLASS SYSTEM CONTAINING NATURAL Fe3O4 PARTICLES
Widanarto, W
Sahar, M. R.
Shoshal, S. K.
Arifin, R.
Rohani, M. S.
Natural Fe3O4 particles obtained by extracting and manual pulverizing natural iron sand, are doped in the TeO⋅ZnO⋅Li2O glass system by melt quenching technique at 800 °C. X-ray diffraction spectra confirms the presence of iron sand particles with the 33-146 nm diameters and the glassy structure. Vibrating sample magnetometer reveals the pulverized sand exhibits paramagnetic behaviour with magnetic susceptibility of 2.76 × 10^-4 m^3 kg^-1. Incorporation of the particles in the glasses changes color, thermal stability and improve the glass formation ability through value of Tc-Tg. Ultraviolet–visible measurements show the optical energy band gap decreases by 1.58 eV. Meanwhile, the resonance amplitude of the electron spin resonance spectrum decreases due to the presence of Fe3O4 particles in reducing the unpaired electron spin. The synthesized glasses exhibit paramagneticbehavior.Keywords: Iron Sand, Ferrite oxide, Tellurite, Glass, Optical band gap, Magnetic property, ESR −Tcg
BERKALA FISIKA
2013-07-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5263
BERKALA FISIKA; Vol 16, No 3 (2013): Berkala Fisika; 95-102
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5263/4748
oai:ojs.ejournal.undip.ac.id:article/3039
2012-04-07T12:46:23Z
berkala_fisika:RA
Interpretasi Struktur Bawah Permukaan Daerah Gunung Merbabu – Merapi Berdasarkan Pemodelan 3D Anomali Bouguer
Sarkowi, Muh
Mount Merbabu represent the volcano which keep a lot of mystery because its activity not many known by vulcanology expert. At least existing data about activity of Mount Merbabu cause the its activity characteristic not yet can be expressed surely. Study [of] about characteristic of Mount Merbabu needed to to learn the nature of vulcanisme activity so that action prevetive fall the victim and disaster mitigation can be done early possible. While the Mount of Merapi represent the most active volcano in the world. In Its activity, eruption Merapi Mount yield the hot cloud (wedus gembel) with the temperature 3000 º C to glide the mean reach the distance 4-5 km. In this research we have been done modeling and interpretation of Bouguer anomaly around Mt. Merapi and Merbabu. Result of research indicate that Mt. Merapi and Merbabu have the negative anomaly which because of existence magma chamber. The magma chamber in Mt. Merapi have a convex form with the deepnes from 500 – 6000 meter from meas sea level, while the magma chamber in Mt. Merbabu have the same from but rather minimize with the deppnes magma chamber about 1000 – 4000 meter from means sea level. Magma chamber in Mt. Merapi caontain liquid magma while the solid magma in Mt. Merbabu. Keywords : Mount Merapi, Mount Merbabu, Gravity
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3039
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus; D11-D18
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3039/2721
oai:ojs.ejournal.undip.ac.id:article/7387
2014-09-24T09:08:58Z
berkala_fisika:RA
STUDI KOROSIVITAS DAN MORFOLOGI PERMUKAAN BAJA KARBON API 5L GR-B YANG DILAPISI POLIMER HIBRID PADA LINGKUNGAN AIR LAUT DAN GAS H2S PADA KONDISI JENUH CO2
Setiawidiani, Dinar
Susilawati, Tuti
Suryaningsih, Sri
Harjo, Hardoyo
It has been tested with the corrosion protection of carbon steel using hybrid inorganic - organic polymer. Hybrid polymer precursor materials is synthesized from monomers poly (TMSPMA) using sol- gel technique. The hybrid polymer precursors coated on the surface of carbon steel API 5L GR - B, and then thermally polymerized. Corrosion test conducted in a seawater environment, H2S, CO2 saturation using potentiodynamic polarization method and morphological examination using a Scanning Electron Microscope. The obtained results shows the corrosion rate of carbon steel without coating in critical condition was 1.643 mm/year. Once the hybrid polymer coated carbon steel with a corrosion rate becomes 0.903 mm/year. The corrosion rate was reduced to 0.74 mm/year. Corrosion rate is related to the protection efficiency of 45.05%. These results are supported by data that shows the surface morphology uneven corrosion on carbon steel surface after coated with polymer hybrid. Keywords : corrosion , carbon steel , polymer hybrid , potentiodynamic polarization
BERKALA FISIKA
2014-04-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
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https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/7387
BERKALA FISIKA; 2014: Berkala Fisika Vol. 17 No. 2 Tahun 2014; 61-66
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/7387/6035
oai:ojs.ejournal.undip.ac.id:article/3056
2012-04-07T08:41:37Z
berkala_fisika:RA
Sifat Optis Aktif Air dalam Medan Magnet pada Frekuensi Resonansi 50Hz-60Hz
Firdausi, K. Sofjan
Lego, Dro Dwi
Sugito, Heri
The interaction between external magnetic field modulated at 50-60 Hz and the dipoles of the sample induced by laser light modulated at 50-100 Hz has been studied. The magnetic field has the maximum value of 170 mT produced by a coil of 810 in turns. The source of light of 632,8 nm and 532 nm is modulated at the resonance value between 30 Hz and 100 Hz. The optical characteristic behavior studied in this research is the change of polarization E-direction of laser light in the aquades samples against the influence of external magnetic field. The result of experiment indicates that the change of laser polarization angle is linearly proportional with the increaseasing of modulated frequency and external magnetic field in sample materials. It is shown that the change of glycerine concentration changes also linearly direction of polarization. The verdet constants measured in the experiment for 632 nm and for 532 nm equal to (0,026 ± 0,005) V (min/g-cm) and (0,025 ± 0,003) V (min/g-cm), respectively. Key words: change of polarization, external magnetic fields, resonance frequency
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3056
BERKALA FISIKA; Vol 10, No 3 (2007): Berkala Fisika; 119-121
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3056/2737
oai:ojs.ejournal.undip.ac.id:article/2030
2012-03-29T14:43:26Z
berkala_fisika:RA
Evaluasi Kinerja Metoda Analisis Pengukuran Neutron (APN)
Arifin, Zaenal
Sasongko, Dwi P
Munir, M
Evaluation of Neutron Activation Analysis (NAA) methods performance has been done. The objective is to validate the data form these analysis on the determination of the trace element concentration in the waters and sediments. This evaluation covering test of devices stability, background counting, Figure of Merit (FOM), Critical Level (Lc), Detection Limit (LD), Determination Limit (LQ) and test of quality result. Result show that device in stabil condition have background counting about 0.0037 to 0.1806 cps, Figure of Merit (FOM) about to 0.0045 to 0.1732 secon. The data result analysis above Critical Level (LC), in LC about 0.07 to 16.42 ppb. Detection Limit (LD) about 0.14 to 32.93 ppb in significant 95% expect Hg obtained LD 1.26 ppb. Determination Limit (LQ) about 0.44 to 100.10 ppb. Test of quality result show that of standardized difference about 15.17% to above 50% and Precision result analysis about 0.01% to 99.00%. Keywords : NAA Methods, Trace element, devices stability, background counting, Figure of Merit (FOM), Critical Level (Lc), Detection Limit (LD), Determination Limit (LQ) and test of quality result.
BERKALA FISIKA
2012-02-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/Vol%2013%20%2C%20No.1
BERKALA FISIKA; Vol 13, No 1 (2010): Berkala Fisika; 11-18
1410-9662
en
oai:ojs.ejournal.undip.ac.id:article/9382
2015-11-06T07:32:21Z
berkala_fisika:RA
FABRIKASI DAN KARAKTERISASI ELEKTRODA KARBON UNTUK SISTEM DESALINASI LARUTAN KCl DENGAN METODE FREEZING THAWING
Sari, Intan Permata
Endarko, Endarko
PVA, activated carbon, capacitive deionization, cyclic voltammetry, desalination
Carbon electrode using an active carbon and poly(vinylalcohol) PVA binder (a water-soluble polymer) by freezing thawing have successfully been synthesized and characterized. In this research, synthesis of carbon electrode was used freezing thawing method with 4 cycles. For each one cycle is required 12 hours for freezing and 12 hours for thawing. Specific capacitance of carbon electrode has been observed and measured using cyclic voltammetry and resulted in a value of 9.1 F/g. Meanwhile, SEM image of the cross-section of electrode showed that the electrode has enough pores so that can be used as electrode in a capacitive deionization system. . Desalination experiments were carried out in single-pass mode. KCl solution with an initial conductivity of 180μs/cm is pumped to CDI cell with flow rate of 25 mL/min at voltage source of 2 V. The result showed that the percentage value of the salt-removal was achieved at 64.95%. Keywords: PVA, activated carbon, capacitive deionization, cyclic voltammetry, desalination
BERKALA FISIKA
2015-01-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
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application/pdf
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https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9382
BERKALA FISIKA; 2015: Berkala Fisika Vol. 18 No. 1 Tahun 2015; 17-24
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9382/7565
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9382/7565
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9382/7565
oai:ojs.ejournal.undip.ac.id:article/3072
2012-04-07T08:51:56Z
berkala_fisika:RA
Penentuan Kandungan Unsur Aluminium, Mangan dan Silikon dalam Air Sungai Code Terhadap Waktu Sampling dengan Metode AANC
Hanim, Alfia
Azam, Much.
Hidayanto, Eko
Nuraini, Elin
An element determination which implied in river Code water below dr. Sardjito brigde with time variation was carried out using fast neutron analysis activation. Water river had been taken away from some dot later mixed, condensed by using an electrical stove from 500 ml to 7 ml. The sample then were iradiated by 14 MeV neutron from neutron generator and then were analyzed by gamma spectrometries. The qualitative results shown that samples contents Al, Mn and Si. The quantitatively rate of element for aluminium is between 39,50-128,43 ppm, mangan between 71,54-182,80 and silicon between 19,12-84,53 ppm. Key words: FNAA, analysis element contents, Neutron Generator
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3072
BERKALA FISIKA; Vol 10, No 1 (2007): Berkala Fisika; 25-30
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3072/2753
oai:ojs.ejournal.undip.ac.id:article/2775
2012-03-29T11:56:36Z
berkala_fisika:RA
Aplikasi Portable Brix Meter untuk Pengukuran Indeks Bias
Hidayanto, Eko
Rofiq, Abdul
Sugito, Heri
Measurement of concentration of sucrose (C12H22O11) solution using Portable Brix Meter was analized to determine its refractive index using Abbe refractometer. The materials used are sucrose solution with a concentration of 5%, 10%, 15%, 20%, 25%, 30%, 35% and 40%, and samples fruits of pear, watermelon, orange, apple and melon and others. The concentration of sucrose solution is proportional to the refractive index. The increase of concentration of sucrose solution will increase the refractive index. Correlation between the concentration of sucrose solution with refractive index is expressed by the equation Refractive index of sucrose solution can be determined from its concentration. Keywords: sucrose solution, concentration, refractive index, portable brix meter
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2775
BERKALA FISIKA; Vol 13, No 4 (2010): Berkala Fisika; 113-118
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2775/pdf
oai:ojs.ejournal.undip.ac.id:article/12803
2016-12-16T09:42:46Z
berkala_fisika:RA
PEMBUATAN SISTEM KENDALI POSISI AUTOFOKUS EKSPERIMEN LENSA DENGAN MOTOR LANGKAH
Gunadi, Isnain
Gernowo, Rahmat
Adi, Kusworo
Auto-Fokus, LDR, IPMC, LSW, EAPs, VCM
The automatic lens experiment with stepper motor position control has been made. Main component of this device are stepper motor which move the lens and screen. Microcontroller is contens the programs of motor movement controller. The screen contain of Light Dependent Resistor (LDR) as voltage sensor. This image will focused when the voltage in the screen is maximum. The result of test show that the automatic measurement is more accurate than manual measurement.Keywords: Auto-Fokus, LDR, IPMC, LSW, EAPs, VCM
BERKALA FISIKA
2015-10-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/12803
BERKALA FISIKA; 2015: Berkala Fisika Vol. 18 No. 4 Tahun 2015; 143-150
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/12803/9595
Copyright (c) 2016 BERKALA FISIKA
oai:ojs.ejournal.undip.ac.id:article/3089
2012-04-07T12:35:37Z
berkala_fisika:RA
Penggambaran Pseudosection Bawah Permukaan dari Suatu Proses Evapotranspirasi Tanaman Jagung Menggunakan Program RES2DINV
Suroso, Teguh
Yulianto, Tony
Yulianto, Gatot
The dipole-dipole investigation of one line corn crop subsurface condition have been done in relationship with evapotranspiration process. The variation of subsurface resistivity investigation occured by the caused of evapotranspiration process.The space of dipole-dipole array measured in 0,20 meter and 0,40 meter with n value from 1 to 4. In May 21st,24th,28th,31st 2005 the dipole-dipole array was measured. The electrodes and corn crop-line possition is parallel. The depiction of subsurface condition viewed by using the Res2Dinv apparent resistivity data. The depiction showed the high resistivity of the corn crop area and the transpiration process is higher than evaporation process. Anomaly resistivity value in the pseudosection output is 54,30 Wm. Keywords: dipole-dipole, evapotranspiration, resistivity
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3089
BERKALA FISIKA; Vol 9, No 3 (2006): Berkala Fisika; 119-129
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3089/2770
oai:ojs.ejournal.undip.ac.id:article/2867
2012-03-29T15:40:30Z
berkala_fisika:RA
Konduktivitas Listrik Pulp Kakao dengan Fermentasi dan Pengenceran
Sugito, Heri
Mujasam, Mujasam
Relation between hydrogen ion exponent (acidity) cacao pulp with energy pass electrics (conductivity) checked to know how ability of cacao pulp at various level of hydrogen ion exponents in sending electrics and also how relation between cacaoes pulps hydrogen ion exponents ably energies pass the electrics.Research done by two treatment that is prose process and fermentation of thinning of cacao pulp. Its way beforehand look for resistivity value (ρ) from cacao pulp. From the resistivity value obtained by conductivity value (σ) cacao pulp. If connected between cacaoes pulps hydrogen ion exponents with energies pass the electrics out of two the treatment, the result is progressively low degree of acidity of cacao pulp, energy pass the electrics is progressively decline.Relation between hydrogen ion exponent with electrics conductivity at cacao pulp at fermentation process yield equation = 2,84782 + 1,01789 e [-(x-2,5)/0,626)] and at thinning process yield equation σ = 3,13506 + 0,46513 e [-(x-2,5)/0,20194). On file energy at cacao pulp is known that longer ammeter galvanometer network is attached smaller the electric current so that the energy still be small.
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2867
BERKALA FISIKA; Vol 12, No 3 (2009): Berkala Fisika; 93-98
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2867/2552
oai:ojs.ejournal.undip.ac.id:article/3105
2012-04-07T12:41:59Z
berkala_fisika:RA
PENGARUH POLARITAS MEDAN LISTRIK EKSTERNAL DAN SUDUT POLARISASI LASER DIODA UNTUK PENGAMATAN EFEK KERR
Wibowo, Hari
Sugiyanto, Eko
Firdausi, K. Sofjan
Marhaendrajaya, Indras
An identification of non linear optics of some material has been carried out. The samples used here are mineral water, salt solution, and sugar solution for various concentrations. A static applied external field E is adjusted to left and right direction. And also, the direction of electric field of laser is varied against E. The magnitude of E used in the experiment is produced by a DC high voltage (0-10 kV) applied on two identical parallel plates. A source of light to the samples is a diode laser of 645 nm and 5 mW. The change of polarization angle of laser b after through the samples is the optical property to be identified. Both of mineral water and salt solution, the effect of polarity of E shows identical results of b vs. E. In case of sugar solution, we obtain a positive gradient for right polarity and negative gradient for left polarity of E. Key words: non linear optics, polarization, polarization angle, Kerr Effect
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3105
BERKALA FISIKA; Vol 9, No 1 (2006): Berkala Fisika; 31-36
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3105/2786
oai:ojs.ejournal.undip.ac.id:article/2923
2012-03-30T14:32:36Z
berkala_fisika:RA
Pembangkitan dan Pemulihan Citra Biner Markov Random Field (MRF) secara Stokastik Dengan Algoritma Markov Chain Monte Carlo (MCMC)
Adi, Kusworo
Bayu Suksmono, Andrian
Ising model or the Spin Glass is a model used to solve the magnetic properties of materials and the occurrence of phase transitions from paramagnetic to ferromagnetic properties. Magnetization of the material comes from the vortex that has two kinds of electron spin, ie {-1 / 2, +1 / 2}. Both spin gives the direction of magnetization (North-South) that opposite. Two-dimensional Ising model (2D), often called a Markov Random Field (MRF). This model is a stochastic model that can represent the image texture. Result binary image generation MRF much affected by changes in temperature, the spin direction will be random if the environment inside a high enough temperature, ie above the critical tempertaur (or Currie temperature) Tc, at this kedaan paramagnetic material. Conversely, if the environmental temperature below Tc, then the material would be ferromagnetic. As for binary image restoration MRF is affected by noise levels and the number of iterations, the best results the image restoration process at the level of noise from 0 to 0.5. Keywords: image restoration, markov random field, stochastic
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2923
BERKALA FISIKA; Vol 12, No 4 (2009): Berkala Fisika; 145-152
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2923/2611
oai:ojs.ejournal.undip.ac.id:article/4985
2013-05-27T14:18:43Z
berkala_fisika:RA
SINTESIS DAN KARAKTERISASI MATERIAL MAGNETIK BARIUM HEXAFERRITE TERSUBSTITUSI MENGGUNAKAN TEORI SOLGEL UNTUK APLIKASI SERAPAN GELOMBANG MIKRO PADA FREKUENSI X-BAND
Sulistyo, Sulistyo
Marhaendrajaya, Indras
Priyono, Priyono
The Barium hexaferrite well known by permanen magnet which have prime properties for microwave application. The properties of Barium hexaferrite modified by substitution of MnCo and Ti have been investigated. Material was produced by sol-gel processing. Analysis of composition, crystal structure, refinement, microstructure and grain size, hysterisies and microwave characteristic respectively done by means of EDX, XRD, GSAS, SEM, magnetometers and wave guide at frequency1-17GHz. The formed crystal structure were hexagonal with the grain size is 500 nm, saturation magnetisation, field of coercivities , and remaneninduction respectively is 0.32 T, 3.8 kA/m and 0.04 T. The substitution of Fe3+ ion, resulted on decreasing the value of Ms, Hc , Rr and range of microwave absorbtion respectively. The maximum absorbtion of microwave occured on frequency 13.6 GHz.Keywords : barium hexaferrite, permanen magnet, sol-gel method, microwave
BERKALA FISIKA
2012-04-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4985
BERKALA FISIKA; Vol 15, No 2 (2012): Berkala Fisika; 63-68
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4985/4518
oai:ojs.ejournal.undip.ac.id:article/2975
2012-04-03T11:50:11Z
berkala_fisika:RA
Sifat Optis Tak-Linear Pada Material KDP
Setyawan, Rahmadi
Setiawati, Evi
Marhaendrajaya, Indras
Firdausi, K. Sofjan
Non-linier optical properties of transparent material Kalium Di- hydrogen Phosphate (KDP) have been identified under the influence of external magnetic fields at wavelength 632.8 nm and 532 nm by using Faraday Effect method. The external magnetic fields used in this experiment is produced from coils with total turns of 810, wire diameter of 0,8 mm, and soft magnet core, and is flowed by maximum AC current 5 A. The magnitude of magnetic fields can be produced is 194.23 mT. The optical property measured here is rotation of polarization angle ß of the laser beam after passed the transparent material. From the experiment, it is obtained Verdet’s constant value for transparent material KDP is (12.60 ± 0.59) min/G-cm at = 632.8 nm and (14.93 ± 0.73) min/G-cm at = 532 nm. Key words: non-linier optic, KDP, magnetic fields, polarization, Verdet’s constant
BERKALA FISIKA
2012-03-30
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2975
BERKALA FISIKA; Vol 11, No 3 (2008): Berkala Fisika; 97-102
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2975/2660
oai:ojs.ejournal.undip.ac.id:article/5003
2013-05-27T15:53:32Z
berkala_fisika:RA
PENGARUH VARIASI KOMPOSISI BRIKET ORGANIK TERHADAP TEMPERATUR DAN WAKTU PEMBAKARAN
Tarsito, Teguh
Sutanto, Heri
Marhaendrajaya, Indras
It has been carried out to study of influence of variation composition in organic briquetteabout temperature and duration time combustion briquette that was optimum. Briquette had made that was briquette with composition rice hull, briquette with composition rice hull and sawdust wood rubber that mixed with glue from amylum gel. Experimental method was used in this research. Briquette sample was burned and measured the temperature of combustion so we gained the values between temperature with combustion briquette duration time of sample briquette,briquette mass before combustion and mass residue of combustion. From the result of this researchthe conclusions can be made were the sample briquette have highest temperature of combustionand longest duration time of combustion was sample briquette with composition rice hull andwood rubber sawdust = 4 grams : 6 grams with oven temperatur 100oC because have longestduration time combustion over temperature 100oC with fluctuation 100°C-150°C was 12 minutes.Keywords : briquette, combustion calor, rice hull
BERKALA FISIKA
2013-01-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5003
BERKALA FISIKA; Vol 16, No 1 (2013): Berkala Fisika; 21-26
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5003/4536
oai:ojs.ejournal.undip.ac.id:article/5216
2013-07-31T09:01:55Z
berkala_fisika:RA
PENENTUAN DOSIS RADIASI EKSTERNAL PADA PEKERJA RADIASI DI RUANG PENYINARAN UNIT RADIOTERAPI RUMAH SAKIT DR.KARIADI SEMARANG
Widyaningsih, Dewi
Sutanto, Heri
Application of nuclear technology is very usefull but it is very risk for human health andsafety, therefore necessary to control of radiation for humans and the environment. For it hasbeen done on the monitoring of external radiation dose to radiations workers in the examinationroom of radiotherapy unit Dr.Kariadi Semarang hospital. The study was conducted by measuringradiation dose rate of examianation room and operator’s room using Surveymeter and monitoringexternal radiation dose of radiation workers using alarm personal dosimeter Rados. The resultsshowed that the highest radiation dose rate is below the head source is equal to 20 μSv / h.External radiation dose in radiation workers every month on average 33.84 μSv, then for one yearis estimated to be 0.406 mSv. This value is within the allowable limit according to the dose limitvalue set by ICRP and BAPETEN which should not exceed 20 mSv a year.Keywords: external radiation dose, dose limit value, radiation protection.
BERKALA FISIKA
2013-04-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5216
BERKALA FISIKA; Vol 16, No 2 (2013): Berkala Fisika; 57-62
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5216/4716
oai:ojs.ejournal.undip.ac.id:article/3034
2012-04-06T07:42:25Z
berkala_fisika:RA
Tungku Sekam Sebagai Bahan Bakar Alternatif Pada Sterilasasi Media Jamur Tiram
Puspita, R. D.
Desna, Desna
Husin, A.D.
Irzaman, Irzaman
Darmasetiawan, H.
Siswadi, Siswadi
Medium Sterilization which has been packaged in the baglog on the oyster mushroom cultivation, one of them can be done with a steam technique using the drum. Commonly used fuel is firewood that could be assisted by using coal or kerosene or LPG gas. Rice husk as alternative fuel of kerosene and firewood can be used as fuel for the medium sterilization. The husk which used in the sterilization process of oyster mushrooms medium for 6 hours, 8 hours, and 10 hours as much as 55.5 kg, 60 kg and 67 kg. The efficiency which obtained in the medium sterilization of oyster mushrooms with using rice husk is reached 45.23% in the medium sterilization for 8 hours. Keywords: Medium, oyster mushrooms, rice husk, sterilization
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3034
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus; C45-C48
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3034/2716
oai:ojs.ejournal.undip.ac.id:article/6578
2014-03-21T15:24:26Z
berkala_fisika:RA
Analisis Produksi Ozon dalam Reaktor Dielectric Barrier Discharge Plasma (DBDP) Terkait Panjang Reaktor dan Laju Alir Udara Serta Pemanfaatannya untuk Menjaga Kualitas Asam Amino Ikan
Teke, Sosiawati
Nur, Muhammad
Winarni, Tri A
Characterization of the reactor Dielectric Barrier Discharge Plasma (DBDP) has performed as a generator of ozone (O3) and as sources of input air. Ozone was measured on a variation of the voltage (4-8 kV) with the speed of air flow of 0,5, 1, 1, 3, 4, 5, 6, 8 and 10 L/min. Plasma reactor was used as ozone generators with spiral-cylinder configuration. Spiral electrodes were made of copper wire diameter of 1,2 mm, coil length 50 mm and diameter cylindrical electrodes while 10,3 mm of cooper sheets with thickness 0,25 mm. Dielectric material used is pyrex with diameter 2 cm and 1,1 mm for its thickness. The AC voltage was used as plasma generators with frequency of 16 kHz. This Research used plasma reactor with three length variations that are 5, 10 and 15 cm . Results showed voltage, the length reactor and air flow rate input affects the ozone concentration. Ozone concentration increased while increasing voltage, the length of reactor and the flow rate used is small. Amino acids quality in short bodied mackerel (Rastrelliger sp.) fed ozone for 12 days of storage showed that ozone could maintain the quality of short bodied mackerel amino acids . Key Words: Spiral-cylinder Electrodes, Ozone Concentrations
BERKALA FISIKA
2014-01-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/6578
BERKALA FISIKA; 2014: Berkala Fisika Vol. 17 No. 1 Tahun 2014; 25-32
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/6578/5412
oai:ojs.ejournal.undip.ac.id:article/3051
2012-04-06T20:19:07Z
berkala_fisika:RA
Penentuan Koefisien Linier Elektro Optis Pada Aquades dan Air Suling Menggunakan Gelombang RF
Jatwiyono, Lilik Eko
Sugito, Heri
Firdausi, K. Sofjan
The coefficients of electrooptics for water and refinery water in RF field have been determined. The RF frequency range used in the research is 6,04 MHz to 11 MHz. Two different light beam (532 nm and 632,8 nm) have been used to measure the change of light polarization after transmitted the samples. The result indicates that the linear and quadratic electro optic coefficients appear in the range of frequency-field. The refinery water has greater value of linear electro optic coefficient than aquades. It is also obtained that the greatest change of polarization angle take place when using the green laser in the field’s position of upright against the RF frequency field and polarization angle of 900. Keywords: RF field, polarization angle, linear electro optic coefficient.
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3051
BERKALA FISIKA; Vol 10, No 4 (2007): Berkala Fisika; 183-186
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3051/2732
oai:ojs.ejournal.undip.ac.id:article/9296
2015-10-19T16:18:06Z
berkala_fisika:RA
RANCANG BANGUN SENSOR KAPASITIF UNTUK LEVEL AIR
Zahrotin, Eli
Endarko, Endarko
Capacitive sensor for measuring water level has successfully been fabricated and characterized. Capacitive water level sensor has been fabricated using coaxial cylinder with an inner and outer radius at 0,955 and 1,435 cm, respectively. The cylinders have a length of 82 cm. The study was used water and air as dielectrics for filling in the space of two cylinders. The design of sensor based on the principle of cylindrical capacitor with two dielectrics. Measurements of water level repeated three times to ensure an accuracy of data. The ruler was used as calibrator for measurement of water level. The result showed that the capacitive water level sensor can be used to measure water level with the maximum of standar deviation around 1,40, when the system was used to measure increased water levet at 50 cm and standar deviation minimum at 0,01 occured when it was used to measure decreased water level at 0 cm. Range of measurement was 0,16 -78,99 cm with an average error value when measurements of increased and decreased water level was 2.30 and 1.75%, respectively. Keywords: water level, capacitive, coaxial cylinder.
BERKALA FISIKA
2014-10-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9296
BERKALA FISIKA; 2014: Berkala Fisika Vol. 17 No. 4 Tahun 2014; 129-138
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9296/7508
oai:ojs.ejournal.undip.ac.id:article/3067
2012-04-07T08:47:10Z
berkala_fisika:RA
PEMBENTUKAN SIFAT OPTIS AKTIF MENGGUNAKAN MEDAN RADIO FREQUENCY (RF) PADA LARUTAN GARAM
Kamil, Ahmad
Azam, M.
Firdausi, K. Sofjan
The non-linear optical property of rotary power of light polarization in water and salt solution has been developed using the Radio-Frequency field (RF-Field). The RF-Field used in the experiment is produced by RF generator, and it supplies the frequency in the range between 6.04 to 14.56 MHz, which then applies to the samples. The source of light with 632.8 nm-wavelength and 532 nm-wave length are used to observe the change of angle polarization of the light, after it passes through the samples. Three modes of the direction of the electric field of light are chosen 0o (E//) (E of light is parallel to E of RF-Field, and 90o (E^) (E of light is perpendicular to E of the RF-Field) in order to determinate the optimal change of the angle of the polarization. The values of is measured as a function of RF-Field, , where is the angular frequency of RF-Field and BRF is the magnitude of magnetic field measured in the center of the coil which is assumed to be homogeny in the circumstances of the samples. The results of the experiment show that the degrees of change of the polarization direction, is largest at the mode. It shows also that at small wavelength of light we obtain the larger, which is indicated the higher frequency of light will more induce the dipoles of molecules of the samples. Keywords: non-linear optics, polarization angle, rotary power
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3067
BERKALA FISIKA; Vol 10, No 2 (2007): Berkala Fisika; 93-97
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3067/2748
oai:ojs.ejournal.undip.ac.id:article/2707
2012-03-29T15:32:53Z
berkala_fisika:RA
Arus Terobosan Pada Transistor Dwikutub Struktur Hetero Si/Si1-xGex/Si Anisotropik Melewati Basis Tergradasi (Graded Base)
Hasanah, Lilik
Khairurrijal, Khairurrijal
Tunneling current in bipolar transistors Si/Si1-xGex/Si anisotropic hetero structure for germanium conditions on a constant basis is not analyzed here. The concentration of germanium in the base which is not constant will result in the potential profile at the base is not flat, but will be graded according to the germanium concentration. Tunneling current calculation is performed semi-analytically and numerically. The calculation result obtained then matched with experimental data. The results show that the results of analytical calculations with results of semi-numerical calculations. While analytical calculations with experimental data only flows from the VBE 0.3 to 0.6 V. Keywords: Tunneling current, germanium concentration, anisotropic material, transfer matrix method, hetero structure bipolar transistor
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2707
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika; 67-72
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2707/pdf
oai:ojs.ejournal.undip.ac.id:article/10837
2016-04-21T12:15:53Z
berkala_fisika:RA
STUDY OF ELECTROOPTICS BEHAVIOUR OF NAPHTHALENE AND ANTHRACENE
Firdausi, K Sofjan
Khumaeni, Ali
Richardina, Very
Arianto, Fajar
Budi, Wahyu Setia
electro-optics, polarization, naphthalene, anthracene, Van der Waals potential energy
In this paper, we demonstrate electro-optics behaviour of naphthalene and anthracene using change of polarization of sample induced by external electric field. The source of light for polarization was 1 mW-he-ne Laser 633 nm. The induced external Electric field was produced by high DC voltage 0 – 7 kV. The samples were diluted in solutions-form using wash-benzene. The result shows that anthracene has higher polarizability than naphthalene, which is indicated by higher change of polarization in anthracene than naphthalene. The Assumption that potential difference is proportional to the distance between molecules is shown qualitatively by graphs of Van der Waals potential energy or force between molecules. In this case, anthracene has higher level Energy than naphthalene so that it can be used in visible excitation for environmental spectroscopy. Keywords: electro-optics, polarization, naphthalene, anthracene, Van der Waals potential energy
BERKALA FISIKA
2015-07-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/10837
BERKALA FISIKA; 2015: Berkala Fisika Vol. 18 No. 3 Tahun 2015; 113-116
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/10837/8572
oai:ojs.ejournal.undip.ac.id:article/3083
2012-04-07T12:33:23Z
berkala_fisika:RA
Rancang Bangun Alat Pengukur Densitas Optik Radiograf Sinar-X Digital
Sumariyah, Sumariyah
Gunadi, Isnain
Mujib, Syaiful
A digitized X-ray radiograph’s optical density measurer has been designed. It’s scale work is between 0.00 to 4.42. The main part of this instrument is an optocopler sensor which will convert the light passing by to an analog current. An optocopler circuit is a combination of LED as a light source, and a photoresistor as a light sensor. The sensor circuit is combined with a voltage devider circuit so that the voltage caused by the light and the output is work reversely. Besides, it combined with an instrumentation amplifier which amplifies the output voltage of the whole sensor. A decoder then added to the circuit to translate the BCD code to a seven segment display. The related segment, then, turned on according to the magnitude of the output voltage. The last part is a seven segment displayer which displays the measure’s result. According to a testing oxamination, the instrument is able to produce a measurement result till a resolution of 0.01.
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3083
BERKALA FISIKA; Vol 9, No 4 (2006): Berkala Fisika; 203-208
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3083/2764
oai:ojs.ejournal.undip.ac.id:article/2827
2012-03-29T14:43:26Z
berkala_fisika:RA
Solusi Numerik Model Dinamik Perlakuan Immunotherapy pada Infeksi HIV-1
Kartono, Agus
Rosidah, Rosidah
Arif, Ardian
There are several types of treatment options that can slow the progression of HIV that can be offered if the number of CD4 + cells has been known for certain, one treatment is by immunotherapy with interleukin-2 (IL-2). This type of treatment is to increase the immune system that can help the body fight against the infection itself. Efforts to raise an immune response would be appropriate to reduce the amount of virus. This brings new hope for treatment of HIV infection and the type of treatment is being researched. Interleukin-2 (IL-2) is most of the cytokines which are proteins made by the body. T-helper cells, a type of white blood cells, produce IL-2 when they were stimulated by infection. In this study, a model of HIV disease progression than individuals not treated can be expressed in a mathematical model, and also expressed immunotherapy model to see the dynamics of viral populations and the population of CD4 + T cells from HIV disease based on ordinary differential equation (ODE). This study aims to calculate the numerical solution immunotherapy mathematical model in HIV infection and a mathematical model to predict the outcome of immunotherapy treatment strategies in HIV infection. Keywords: HIV, CD4 + T cells, immunotherapy, mathematical modeling
BERKALA FISIKA
2010-10-22
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2827
BERKALA FISIKA; Vol 13, No 1 (2010): Berkala Fisika; 1-10
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2827/2512
oai:ojs.ejournal.undip.ac.id:article/23881
2019-06-25T14:40:01Z
berkala_fisika:RA
SISTEM SENSOR NIRKABEL UNTUK MONITORING EFISIENSI PANEL SURYA
Pakradiga, Ahlan
Suryono, Suryono
solar panel, monitoring system, remotely, sensor, efficiency of solar panels
Solar panels are devices consist of several solar cells that convert light into electrical energy. In order to work optimally, a monitoring system to electrical current, voltage, and light intensity in solar cells is needed. The monitoring system can be wirelessly carried out, so that solar panels can be remotely monitored without having to go to the field. The solar panel monitoring system used a wireless sensor system that uses sensors, System on Chip (SoC) WiFi Microcontroller, and computers. The sensors used were ACS712 current sensor, voltage sensor, and BH1750 light intensity sensor module. Before it was used, the current sensor and voltage sensor should be characterized and calibrated. Data stored in the database can be processed to calculate savings on solar panels in real time using php programming, then it was transferred to the web. The characterization equation for the current sensor is y = 944.9x + 13597.0, the average error for calibrating the current sensor is 3.39%. The characterization equation for the voltage sensor is y = 471.2x – 206.2 and the average error for the voltage sensor calibration is 0.77%. Sensor calibration is obtained by an average error of 1.10%. The efficiency of solar panels at bright times is 12.49%. In this study, it has been found that the efficiency of solar panels is influenced by the intensity of sunlight.Keywords: solar panel, monitoring system, remotely, sensor, efficiency of solar panels
BERKALA FISIKA
2019-06-24
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/23881
BERKALA FISIKA; Vol 22, No 2 (2019): Berkala Fisika Vol. 22 No. 2 Tahun 2019; 77-85
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/23881/15398
Copyright (c) 2019 BERKALA FISIKA
oai:ojs.ejournal.undip.ac.id:article/3100
2012-04-07T12:39:53Z
berkala_fisika:RA
UJI HASIL KINERJA MESIN PENGOLAH FILM OTOMATIS MINI MEDICAL
Raharjo, Oky Didik
Azam, Much.
Ketut Umiati, Ngurah Ayu
Have been researched result test of Mini Medical automatic processing film machine. The research is conducted by reforming X-ray toward the film in the cassette which there is stepwedge on it, film catharsis is then performed using automatic processing film machine. After generating radiograph, its density is measured, and then we count speed index, fog index and contrast index. This activity is conducted every day for seven days in succession. Based on the index of fog and contrast film, the result of the research indicates that the work result of automatic processingn film machine on the first until fifth day is still in the allowed limits, but on the sixth and seventh day it exceeds the permitted limits. This is due to the ability of generator solution is getting lower (solution pH is getting smaller). Mean while, its speed index for seven days is still in the permitted limits. Keywords : Result test, automatic processing film machine, stepwedge, fog, contrast
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3100
BERKALA FISIKA; Vol 9, No 2 (2006): Berkala Fisika; 103-107
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3100/2781
oai:ojs.ejournal.undip.ac.id:article/2899
2012-03-29T15:40:49Z
berkala_fisika:RA
Analisis Spektrum Atomik dalam Penentuan Temperatur Eksitasi, Temperatur Elektronik dan Densitas Elektron Plasma Argon
Nur, Muhammad
Determination of excitation temperature, electron temperature and density of electron has been done through analysis of the atomic spectrum. Atomic spectrum emitted by the argon plasma with a pressure of 1 MPa. Plasma generated in a corona glow discharge reactor. Excitation temperature (Texc) was obtained by using the Boltzmann distribution and the plasma was assumed to occur in Local Thermodynamic Equilibrium (LTE). Electronic temperature (Te) was obtained by using Saha distribution and taking the ratio between the intensity of the observed spectrum (integrated in the frequency interval) with continuous intensity was observed (not integrated). From the two temperatures, and using the Saha distribution, the density of electron/ion (Ne = Ni) can be determined. Argon plasma which was in LTE condition with a pressure of 1 MPa, Texc = 2877.70 K, Te = 21266.54 K and Ne = Ni = 4.60 x 1021 cm-3 were obtained Keyword: Excitation temperature, electron temperature, density of electron, atomic spectrum, corona glow discharge, Boltzmann distribution, Saha distribution, Local Thermodynamic Equilibrium
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2899
BERKALA FISIKA; Vol 12, No 3 (2009): Berkala Fisika; 115-124
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2899/2582
oai:ojs.ejournal.undip.ac.id:article/4979
2013-05-27T11:13:48Z
berkala_fisika:RA
ANALISA DATA CURAH HUJAN STASIUN KLIMATOLOGI SEMARANG DENGAN MODEL JARINGAN SYARAF TIRUAN
Arif, F M
Gernowo, Rahmat
Setyawan, Agus
Febrianty, D
The major purpose of this research was to applying artificial neural network to predicting rainfall in Semarang climatology station and occurs its accuration. One ofartificial neural network method is back propagation artificial neural network. Withheuristic technique its optimizing to train algorithmic faster and improving net works. Weused rainfall data in 2000-2009 from Semarang climatology station. Artificial neuralnetwork modelling planned in MATLAB R2008b programme. The best model or net viewsfrom correlation level between net’s output, observation data and RMSE point whichproduced by the net. The results shown the best network has 5 neurons in input’s layer, 10in hidden layer and 1 neuron in output layer. Its performance has learning data 66,7%,testing data 33,3%, learning rate 0,7 and momentum 0,4 which has correlated around70,72% to observation data with RMSE point 141,55. The best network will use topredicting rainfalls in 2010, its correlation is 88,43% and its RMSE points is 83,76 tillJuly. Its better than what BMKG has which only reach 84,63% correlation points and87,21 RMSE points.Keywords: Artificial neural network, optimizing, correlation, RMSE
BERKALA FISIKA
2012-01-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4979
BERKALA FISIKA; Vol 15, No 1 (2012): Berkala Fisika; 21-26
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4979/4512
oai:ojs.ejournal.undip.ac.id:article/2937
2012-03-30T15:03:39Z
berkala_fisika:RA
Identifikasi Struktur Lapisan Bawah Permukaan Daerah Manifestasi Emas Dengan Menggunakan Metode Magnetik Di Papandayan Garut Jawa Barat
Arifan Kahfi, Rian
Yulianto, Tony
A geophysical investigation has been done using magnetics method at Papandayan, Garut, West Java. The aims of this research are to interpret the sub-surface geology structure at Papandayan based on 2D modelling and geological information. Raw data processing was performed using IGRF (International Geomagnetics Reference Field) and diurnal variation correction to obtain total field magnetic anomaly. Upward continuation was performed at 150 meters height above reference spheroide for total field anomaly. Reduction to pole was performed to simplify interpretation process. Data acquired using Proton Precession Magnetometer (PPM) and Global Positioning System (GPS) Garmin during 3 days, which cover an area of 600 meter x 1100 meter and measurement spacing was 5 meter. Qualitative interpretation were done by upward continuation total field magnetic anomaly maps. While quantitative interpretation was done by 2D modelling by slicing upward continuation total field magnetic anomaly maps using Geomodel. It is interpreted that Papandayan sub-surface geology structure was controlled by tuff rock with susceptibilities 1 x 10-5 in emu system, andesite rock with susceptibilities 0.0135 in emu system, porphyry rock 0.010 in emu system, intrusion rock with susceptibilities 0.013 in emu system, sedimentary rock with susceptibilities 7 x 10-5 in emu system, and sedimentary rock with susceptibilities 8 x 10-5 in emu system. Porphyry rock as gold prospect is interpreted as alteration zone of silisification. Keyword: magnetics, gold, Papandayan.
BERKALA FISIKA
2012-03-30
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2937
BERKALA FISIKA; Vol 11, No 4 (2008): Berkala Fisika; 127-135
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2937/2625
oai:ojs.ejournal.undip.ac.id:article/4997
2013-05-27T16:00:59Z
berkala_fisika:RA
PEMBUATAN KURVA ISODOSIS PAPARAN RADIASI DI RUANG PEMERIKSAAN INSTALASI RADIOLOGI RSUD KABUPATEN KOLAKA - SULAWESI TENGGARA
Syahria, Syahria
Setiawati, Evi
Firdausi, K Sofjan
t have been conducted research about the influence of distance variability betweensecondary radiation source and the determining spot to scatter radiation exposure in theinspection room I radiology instalation RSUD Kolaka – South East Sulawes, it producted isodosecurve .This research use phantom, in the form of water in the plastic container high 40 cm andwidth 21 cm, with exposure wide 30× 40 cm. Exposure condition is given by fixed expose factor covering of tube voltage 90 kV, tube current 150 mA and exposure time 0.8 second. Sample in this research is distance of 1 meter; 1,5 meter and 2 meter from the secondary radiation source to thedetermining spot, which measuring the scatter radiation exposure is directly conducted by thesurvey meter measuring instrument.The result of research indicates that the amount of thescattered radiation exposure will downhill progresivley to addition distance, so it can know thepoints/places that safe to the scatter radiation exposure. It can also know the maximum time limitallowed for a radiator worker in the inspection room I.Keywords : Isodose Curve , Phantom, Expose factor, Scatter radiation exposure.
BERKALA FISIKA
2012-10-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4997
BERKALA FISIKA; Vol 15, No 4 (2012): Berkala Fisika; 123-132
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4997/4530
oai:ojs.ejournal.undip.ac.id:article/2994
2012-04-03T15:26:44Z
berkala_fisika:RA
Rancang Bangun Spektroskopi FTIR (Fourier Transform Infrared) untuk Penentuan Kualitas Susu Sapi
Endro Suseno, Jatmiko
Firdausi, K. Sofjan
A Fourier Transform Infrared spectroscopy instrument has beed developed in the range middle infrared. The important instrument in this research is to make interferogram using He-Ne Laser based on Michelson interferometer. The result indicates that the interferogram seems work well and should give some spectra in the range of middle infrared frequencies. Key words: FTIR, interferogram, spectroscopy
BERKALA FISIKA
2012-04-03
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2994
BERKALA FISIKA; Vol 11, No 1 (2008): Berkala Fisika; 23-28
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2994/2678
oai:ojs.ejournal.undip.ac.id:article/5010
2013-05-27T16:22:47Z
berkala_fisika:RA
PEMBUATAN SOFTWARE MONITORING JUMLAH PRODUKSI KERUPUK MENGGUNAKAN BORLAND DELPHI 7.0
Adiyani C, Mirsari
Danusaputro, Hernowo
The monitoring program for the crackers counter has been done by Borland Delphi 7.0. The results of this program is intended to help the manager’s job in monitorin the amount ofcracker produced by industry. This program using Borland Delphi 7.0. While to find out the cracker pieces which fellfrom the conveyor using photodiodes sencors and lasers as light sources directed at the sensorphotodiodes. When the sencor detected a cracker pieces which fell from the conveyor, the sensorsend a signal to the microcontroller for processing and then send to computer via serialcommunication. On computer, that data is received by Borland Delphi 7.0 program to displayedand stored in Microsoft Access. The system has been realized successfully and can printer the data stored in databases sothat the amountof crackers produced will be known.Keyword: Crackers, Borland Delphi 7.0, Microsoft Access, photodiodes sencors, lasers
BERKALA FISIKA
2011-07-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5010
BERKALA FISIKA; Vol 14, No 3 (2011): Berkala Fisika; 101-106
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5010/4543
oai:ojs.ejournal.undip.ac.id:article/3024
2012-04-05T15:01:31Z
berkala_fisika:RA
Uji Sifat Listrik Film Tipis LiTao3 dan LiTaFe2O3
Indro, M. N.
Sastri, B.
Nady, L.
Ridwan, E.
Syafutra, H.
Irzaman, Irzaman
Siswadi, Siswadi
Lithium Tantalat (LiTaO3) pure and LF Thin films has been done is cube-shaped Ferium Oxide Fe2O3 (LFT) with a cube-shaped variation 0%, 2.5%, 5% and 7.5% above the substrate Si (100) p-type using a chemical solution deposition (CSD) method by spin coating technique at 3000 rpm rotational speed for 30 seconds. LF Thin films made with 1 M concentration and annealing at a temperature of 850 ° C for Si substrates. Thin films on p-type silicon substrates were characterized thickness using volumetric method, characterization conductance by using LCR meter, test the current-voltage characterization (IV curve) using Keithley Meter IV model 2400, characterization of dielectric constants and time constants using the oscilloscope and function generator and pyroelectric characterization using Wetsteind bridge circuit which in furnace (combustion) to a temperature of 1300C by calculating the increase in temperature variation. From the characterization results indicate thickness thickness increases with the number pendadah ferium given oxide. IV characterization results showed that LF and LFT thin film is a dielectric resistor.Hasil are contained in a thin film on p-type silicon substrate varies in accordance with the addition pendadah used were 0%, 2.5%, 5% and 7.5%. Keywords: LF, LFT, thin film, CSD, spin coating, annealing, cube-shaped, thickness, dielectric constant, time constant-voltage current, ferium oxides, pyroelectric.
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3024
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus; C5-C12
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3024/2707
oai:ojs.ejournal.undip.ac.id:article/6181
2014-02-14T09:56:03Z
berkala_fisika:RA
SISTEM AKUISIS DATA KOMPUTER PADA SENSOR ULTRASONIC RANGER UNTUK PENGUKURAN LEVEL MUKA AIR
Suryono, Suryono
Surarso, Bayu
Saputra, Ragil
This paper describes the method of ultrasound ranger development, data acquisition system and its characteristic than applied for automation water level distance measurement system using personal computer. This system is very important for recorded of water level data acquisition inlong time so data communication at measurement system.The system consist of ultrasonic distance sensor, microcontroller for time-of-flight counter and serial interface, and computer system fordata acquisition system. The microcontroller drive of sensor for generate of burst pulse. The 16-bitof counter of microcontroller was used for time-of-flight counter. Data was transmitted tocomputer twice at 8-bit of counter register. The microcontroller transmitted data at 9600 BPSusing UART protocols and slave-master for serial communication system. The communicationsystem was connected at voltage level communication RS232. The computer application of dataacquisition system was connected at COM port using Cport pellete in Borland Delphi. Thecollected data calibrated using standard. The result of system characterization have highmeasurement stability system at 99,61%, range of measurement distance at 10 cm to 280 cm,linear correlation with standard measurement at R = 0,9999, so it good for more application.Keywords : distance, pulse, counter, serial communication
BERKALA FISIKA
2013-10-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/6181
BERKALA FISIKA; Vol 16, No 4 (2013): Berkala Fisika; 139-144
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/6181/5237
oai:ojs.ejournal.undip.ac.id:article/3045
2012-04-07T12:48:21Z
berkala_fisika:RA
Pengaruh Format Soal Dalam Bentuk Animasi Terhadap Validitas Dan Reliabilitas Tes Pemahaman Konsep Pembiasan Cahaya
Suhandi, Andi
Samsudin, Achmad
Setyawan, Agus
This research was conducted to investigate the influence of question format in the form of animation to the validity and reliability tests of understanding the concept of light refraction. For the sake of it has constructed a test of understanding the concept of the refraction of light in an animation format by replacing static pictures and descriptions of the phenomenon of refraction of light propagation in a static format (paper and pencil test) with computer animation. Second test version, the version animated and static versions then tested to 100 students from three high schools in Bandung, which has received the learning material of light refraction. The second test version of the test results are then analyzed to determine the validity and reliability respectively. To see the influence of a test version of the level of validity and reliability, then compare the level of validity and reliability of both versions of this test. The results showed that both the level of validity and reliability tests in levels higher than the animated version of the test in the static version. Level of validity for the second consecutive test version 0.89 (very high) for an animated version and 0.71 (high) for the static version, whereas the level of reliability, 0.92 (very high) for an animated version and 0.78 (high ) for the static version. These results show obvious evidence of the influence of question format in the form of animation on the level of validity and reliability tests of understanding the concept of habituation of light. Keywords: Animation Test Version, Test Version Static, validity, reliability, refraction of light
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3045
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus; E25-E30
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3045/2727
oai:ojs.ejournal.undip.ac.id:article/8880
2015-08-01T18:12:12Z
berkala_fisika:RA
DETEKSI ARITMIA BLOKADE CABANG BERKAS KIRI PADA ELEKTROKARDIOGRAM DENGAN JARINGAN SYARAF TIRUAN BERDASARKAN FITUR INTERVAL QR DAN RS
Primadyanie, Nistya Rischa
Nuryani, Nuryani
Purwanto, Hery
Yahya, Iwan
Lestari, Anik
Left branch bundle block (LBBB) detection system have been done and tested. The system created by using Artificial Neural Network (ANN). Some ANN methods have been investigated. Electrocardiogram features that represent the characteristic of LBBB which were QR interval and RS interval used as input. Output of the system was electrocardiogram status to detect LBBB and normal beat. LBBB detection has been done with various input with QR interval, RS interval, QR and RS interval. Detection system have been tested using chlinical data and shown that MLP method gave the best performance. Its performance shown by sensitivity, specificity, and accuracy up to 99,92%, 100%, and 99,94% . Keywords: LBBB, artificial neural network, QR interval, RS interval
BERKALA FISIKA
2014-07-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/8880
BERKALA FISIKA; 2014: Berkala Fisika Vol. 17 No. 3 Tahun 2014; 91-98
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/8880/7215
oai:ojs.ejournal.undip.ac.id:article/3062
2012-04-07T08:46:02Z
berkala_fisika:RA
Simulasi Pengisian Tangki Cairan dengan Banyak Variabel
Edi Widodo, Catur
A program for determination of the height of liquid in the container has been done with Python programming language version 4.2. Program was simulated by position of the height of the liquid dependent on the time. Program was constuct by mean finite difference equation in object oriented programming Python. Object simulation is container with given radius and infinitif height and has two crane that is liquid enter crane and liquid leaves crane. Input parameter is radius of container, radius of enter crane, radius of leaves crane, and flow rate of enter crane. Output is height level of liquid. The result of simulation indicated the terminal velosity is dependent or radius of enter crane, radius of leaves crane, and flow rate of enter crane
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3062
BERKALA FISIKA; Vol 10, No 2 (2007): Berkala Fisika; 61-64
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3062/2743
oai:ojs.ejournal.undip.ac.id:article/2774
2012-03-29T12:44:39Z
berkala_fisika:RA
Studi Analisis Parameter Gempa Bengkulu Berdasarkan Data Single-Station dan Multi-Station serta Pola Sebarannya
Hadi, Arif Ismul
Suhendra, Suhendra
Efriyadi, Efriyadi
Abstract The purpose of this research is to analyze of tectonic earthquake parameter value in Bengkulu Province based on single-station data of BMKG Kepahyang, Bengkulu and multi-station data of BMKG Center, Jakarta along with determine its distribution model from January 2005 until March 2009. The results show that distance difference of mean earthquake epicenter is 28.60 km. The distribution of earthquake in Bengkulu Province from January 2005 until March 2009 had majority distributed in Hindia Oceanic and its mean earthquake included shallow earthquake (<70 km). Keywords: Earthquake parameter, single-station, multi-station, magnitude, and epicenter.
BERKALA FISIKA
2012-03-28
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2774
BERKALA FISIKA; Vol 13, No 4 (2010): Berkala Fisika; 105-112
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2774/pdf
oai:ojs.ejournal.undip.ac.id:article/9668
2015-12-08T10:02:37Z
berkala_fisika:RA
OPTIMASI PEMBANGKIT LISTRIK TENAGA ARUS LAUT MENGGUNAKAN SISTEM TURBIN SAVONIUS TERMODIFIKASI
Rahmi L, Halida
Dharmala S, Budi
Gediana, Almas
Yusup, Agus
Septria, Wenty
Savonius turbine, sea flow, electrical energy, power plant
Difficulty of access to service and installation of the electrical network in the area around a coast becomes a factor causing uneven distribution of power network. Therefore, a new prototype of Sea Flow Power Plant was prepared using a modified Savonius turbine. The modified Savonius turbine is a vertical wind turbine, which is modified into a horizontal turbine and made two pairs of turbines in different directions. Advantage of this turbine can optimally capture the come and back flows. Preparing prototype of the turbine is conducted after collecting data of the sea flow velocity surrounding Teluk Penyu - Cilacap, that is followed by manufacturing a modified Savonius turbine and prototype of PLTAL. Performance test reveals that the prototype can generate P =0,3 Watt, the velocity of turbine rotation ω = 44.42 rad/s, the turbine torque M = 0,0064 Nm and the diameter of turbine d = 0,32 m. The sea flow velocity is often naturally changed leading to the turbine rotation change. It is found that the power and the turbine rotation increase with increasing the sea flow velocity. At the sea flow velocity of 1,5 m/s, the prototype of PLTAL has good performance and very potential as a source of alternative electrical energy in the future. Keywords: Savonius turbine, sea flow, electrical energy, power plant.
BERKALA FISIKA
2015-04-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9668
BERKALA FISIKA; 2015: Berkala Fisika Vol. 18 No. 2 Tahun 2015; 75-82
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9668/7744
oai:ojs.ejournal.undip.ac.id:article/3078
2012-04-07T12:31:22Z
berkala_fisika:RA
Optimasi Elektroda Pada Sistem Pembangkit Plasma Non Termik untuk Meningkatkan Kuantitas Benih Mangrove
Azam, Much.
Hidayanto, Eko
The Mangrove is the tropics nature resources that has two aspects, economics and ecology. This plant can be iradiated by the corona discharge. It is need to radiate mangrove seed with nitrogen and analize it’s growt. For that have need optimations of the electrode on the non thermics plasma generator system in order to get the effective and the efficient radiations. The steps of the research are : analize system, make a prototype, test the prototype with simulations, compare the simulations result with the experiment result and analize the results. From the research can get conclution that: 1) had been succes to make prototype of the mangrove plant reproduction system by the corona discharge plasma technology with the point-plant electrode, 2) the simulations result show that electrical fields shall increase if the distance from electrode has been decreases, or the voltage of electrode has been incresed, or the distance among electrode has been decreased or the value of the electrode radius.has been opotimum, 3) the result of simulations show that the current density shall decrease if distance among electrode has been decreased, 4)for the same distance electrode, the electricel fields of the experiment results is bigger than the simulations result, because the value of permeability and permittivity medium on the simulation is using the value of the vaccum space. Key words : the non thermics plasma, iradition, Mangrove
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3078
BERKALA FISIKA; Vol 9, No 4 (2006): Berkala Fisika; 171-176
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3078/2759
oai:ojs.ejournal.undip.ac.id:article/2797
2012-03-29T14:38:02Z
berkala_fisika:RA
Analisis Distribusi Suhu Aksial Teras Dan Penentuan keff PLTN Pebble Bed Modular Reactor (PMBR) 10 MWE Menggunakan Metode MCNP 5
Setiyo, Agung
Munir, Mohamad
The axial temperature distribution and effective multiplication factor (Keff) for PBMR 10 MWe which used uranium dioxside (UO2) as fuel, graphite as moderator, and helium (He) gas as cooler with heterogenous reactor design which used geometry of reactor core finite cylinder has been investigated. The axial temperature distribution of reactor core analysized by splitting core reactor become 57 layers axially and every layer has height 14,9 cm. Keff of reactor calculated by MCNP 5 with fuel enrichment variation from 7 to 10% and variation range 0,5%. The result shows that reactor in critical condition with fuel enrichment 8,6% and average temperature of reactor core is 893,635 K. Keywords: PBMR, MCNP, Temperature distribution, Keff
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2797
BERKALA FISIKA; Vol 13, No 3 (2010): Berkala Fisika; 85-90
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2797/pdf
oai:ojs.ejournal.undip.ac.id:article/23483
2019-06-25T13:53:44Z
berkala_fisika:RA
METODE AUTOREGRESSIVE INTEGRATED MOVINGAVERAGE (ARIMA) DAN METODE ADAPTIVE NEURO FUZZY INFERENCE SYSTEM (ANFIS) DALAM ANALISIS CURAH HUJAN
Wulandari, Rosita Ayu
Gernowo, Rahmat
ARIMA, ANFIS, time series data, linear, non-linear
Information of rainfall prediction is important for Indonesian peoples. Many statistical methods can be used in rainfall prediction, they are ARIMA (Autoregressive Integrated Moving Average) and ANFIS (Adaptive Neuro Fuzzy Inference System) methods. The purpose of this study was to compare between ANFIS method and ARIMA method to get rainfall prediction in some periods. The ARIMA method was time series data analysis often used in forecasting. While the ANFIS method was forecasting method based on rarely found time series events that are pure linear or non-linear. Based on this study, the ANFIS method has a good accuracy for time series data analysis compared with the ARIMA method. The ANFIS method has 6.9811 for the result of correlation and 87.29% for the RMSE, while result of correlation for the ARIMA method is 14.037 with 24.92% for RMSE. The ARIMA method is not good for prediction of daily data cases and non-linear data, so that the result is not actual which has a constant and flat for data prediction. Keywords: ARIMA, ANFIS, time series data, linear, non-linear
BERKALA FISIKA
2019-05-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/23483
BERKALA FISIKA; Vol 22, No 1 (2019): Berkala Fisika Vol. 22 No. 1 Tahun 2019; 41-48
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/23483/15171
Copyright (c) 2019 BERKALA FISIKA
oai:ojs.ejournal.undip.ac.id:article/3095
2012-04-07T12:38:22Z
berkala_fisika:RA
Penghitungan Rasio Intensitas Ca (II) 396,8 nm dan Ca (I) 422,6 nm pada Sampel Tasbih Asli dan Imitasi menggunakan Metode Laser Induced Shock wave plasma (LISPS)
Khumaeni, Ali
Setia Budi, Wahyu
Firdausi, K. Sofjan
Spectral analysis of elemental bead samples has been done using Laser Induced Schock Wave Plasma (LISPS). This experiment is aim to distinguish between bead samples from fresh white coral and its artificial from hardwood through determination of spectral intensity of Ca(II) 396,8 nm and Ca(I) 422,6 nm. The samples are held by 10 torr and induced by NdYAG Laser 1064 nm in wavelength. Results show that the original and artificial samples can be distinguished from ratio of intensity at 1,68 : 0,80 both for white coral and its artificial from hardwood through determination of spectral intensity of Ca (II) 396,8 nm dan Ca (I) 422,6 nm respectively.
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3095
BERKALA FISIKA; Vol 9, No 2 (2006): Berkala Fisika; 55-62
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3095/2776
oai:ojs.ejournal.undip.ac.id:article/2876
2012-03-29T14:25:45Z
berkala_fisika:RA
THE ELECTRIC FIELD FORMULATIONS IN THE PLANE-KNIFE CONFIGURATIONS
Yoyo Wardaya, Asep
Nur, Muhammad
In this paper, we calculate enormous electric field produced by the plane-knife configuration of the plasma generator. The value of electric field is calculated by two ways of configurations, the first is the almost perpendicular form of the Capasitor plates and second the perpendicular one. The result of calculation is the plates perpendicular form will produce higher electric fields than the almost perpendicular case. Key words : Plasma generator, plane-knife configuration , electric field.
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2876
BERKALA FISIKA; Vol 14, No 2 (2011): Berkala Fisika; 71-74
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2876/2559
oai:ojs.ejournal.undip.ac.id:article/4974
2013-05-27T11:15:43Z
berkala_fisika:RA
PEMODELAN ANOMALI GRAVITASI SESAR DENGAN PENDEKATAN MODEL SHEET (MODELLING GRAVITY ANOMALIES OF FAULT BY SHEET MODEL APPROACH)
Nurwidyanto, M Irham
Setiawan, Ari
AbstractThe modelling gravity anomaly of fault model with a model sheet approach with the aim to study the response of gravity anomalies of faults was done.Modelling is done by modelling approaches bedding with a thickness t and density contrastwith surrounding Δρ. The gravity anomaly at a point are formulated and the calculation andvisualization program created in matlab8RS. From the modelling is made it can be concluded that the fault position is generally locatedbetween the gravity anomaly minimum and maximum gravity anomaly. When thetypes of fault arevertical normal fault then the fault position precisely located on the horizontal gradient maximumvalue, whereas when the fault are not vertical, the location of fault are to be near (around) themaximum horizontal gradient.Key words: modelling, gravity anomalies, faults, model sheets.
BERKALA FISIKA
2011-10-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4974
BERKALA FISIKA; Vol 14, No 4 (2011): Berkala Fisika; 129-134
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4974/4507
oai:ojs.ejournal.undip.ac.id:article/2931
2012-03-30T14:28:25Z
berkala_fisika:RA
Pengaruh Teknik Tegangan Tinggi Terhadap Entrasce Skin Exposure( ESE ) dan Laju Paparan Radiasi Hambur Pada Pemeriksaan Abdomen
Dhahryan, Dhahryan
Azam, M.
The measurement for influence of high voltage technique to Entrance Skin Exposure and Rate of Scattered Radiation Exposure on abdomen inspection have been conducted. The ESE measurement is conducted using Electrometer and calculated by semi empirical method, while in measurement of rate of scattered radiation exposure using survey meter at a distance of 100 cm from the object by varying data intake points and its direction of detector. The result indicates that the usage of high voltage technique yields absorbent dose of 124 mrad and radiation exposure of 339 mR. It is lower than the standard value of absorbent dose of 322.7 mrad and radiation exposure of 130,5 mR. The result of measurement is higher than calculation. In measurement of exposure of scattered radiation rate with detector position faced to object, on right side of cathode, it yields 1.03mR/hour with standard voltage and 0.32 mR/hour with high voltage technique. While in measuring exposure of scattered radiation rate and back-scattered obtained result on A’ and C’ (close to anoda and side of object) and A” and C” nearly same, with highest value of 1 mR/hour and 0.93 mR/hour at standard tube voltage and at high kV technique obtained lower value of 0.29mR/hour and 0.25mR/hour.
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2931
BERKALA FISIKA; Vol 12, No 1 (2009): Berkala Fisika; 21-26
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2931/pdf
oai:ojs.ejournal.undip.ac.id:article/4991
2013-05-27T16:03:20Z
berkala_fisika:RA
IDENTIFIKASI ALIRAN AIR INJEKSI DI LAPANGAN TALANG JIMAR REGION SUMATRA MENGGUNAKAN METODE SPONTANEOUS POTENTIAL
Fithria I D, Ni'matul
Setyawan, Agus
Yulianto, Tony
Spontaneous-potential observation using amplitude potential method had been done beneathTalang Jimar area. The purpose of observation are to determine the distribution and depth of fluidinjection. Spontaneous-potential which has been corrected then processed using excel and surfer 9 toknow the distibution of its spread, while for the clarified of the deph we used spherical model. Thespontaneous-potential result shows ranging from -40 mV up to 10 mV with direction towards thereference block and a depth of 244,93 meters show.Keywords : Spontaneous‐potential, fluid injection, Talang Jimar, spherical model.
BERKALA FISIKA
2012-07-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4991
BERKALA FISIKA; Vol 15, No 3 (2012): Berkala Fisika; 95-100
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4991/4524
oai:ojs.ejournal.undip.ac.id:article/2981
2012-04-03T12:35:10Z
berkala_fisika:RA
Studi Kualitas Minyak Goreng Dengan Parameter Viskositas Dan Indeks Bias
Sutiah, Sutiah
Firdausi, K. Sofjan
Setia Budi, Wahyu
The aim of this research to investigate the quality of palm oil through its viscosity and refractive index before and after used. Viscosimeter Ostwald is used to measure the viscosity and refractive method in prism is used to measure refractive index. The measurement was carried out in room temperature. The samples are fresh oil, and expired oil. Analysis of the quality of palm oil based on viscosity measurement and refractive index show that palm oil that had not been used is the highest value and the palm oil that twice used is the lowest value. Keyword: viscosity, quality of oil
BERKALA FISIKA
2012-04-03
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2981
BERKALA FISIKA; Vol 11, No 2 (2008): Berkala Fisika; 53-58
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2981/2665
oai:ojs.ejournal.undip.ac.id:article/3000
2012-04-04T07:36:29Z
berkala_fisika:RA
Pengembangan Sistem Pengukuran Gejala Fisis Longsor Sistem Elektronik Dan Optik
Widiyatmoko, Bambang
Hanto, Dwi
Puranto, Prabowo
Landslides are a common disaster in Indonesia so that the necessary anticipation through the monitoring of areas prone to the development of instrumentation systems disaster. Design has been done measuring the physical symptoms of landslides using optical and electronic systems. Measured physical symptoms include a shift in soil, and soil strains. Shift in the electronic ground sensors made by using linear and potensio constan current source. The result of measurement is known that this sensor can detect a shift change of 0.5 mm with a maximum shift of 250 mm. Soil strain measured using a fiber optic brag grating (FBG), which changes the transmission peak of FBG was done by using the diode laser wavelength sweeping. Fiber brag grating is an optical sensor that works according to the resonant effect of a refractive index grating lattice, where the resonant wavelength is determined by the lattice distance. From this principle it is when the lattice spacing change due to the strain and temperature changes, the peak resonant wavelength will also change. Changes in the resonant peaks are measured to determine the strain or temperature measurement. measurement Simulation showed that the relationship between strain and change in peak wavelength is linear with slope (Δλ / ΔF) 1.41 nm / kNewton. Keywords: Extensometer, linear potentiometers, fiber Brag grating, landslides, system monitoring, disaster
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3000
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus; B15-B24
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3000/2684
oai:ojs.ejournal.undip.ac.id:article/6176
2014-02-10T09:35:59Z
berkala_fisika:RA
KORELASI NILAI TIME REPETITION (TR) DAN TIME ECHO (TE) TERHADAP SIGNAL TO NOISE RATIO (SNR) PADA CITRA MRI
Aji Prastowo, Alan Tanjung
Setiabudi, Wahyu
Anam, Choirul
Effort to obtain a correlation of TR and TE to the value of Signal to Noise Ratio (SNR) in MRI machine has been carried out. In this research used MRI Hitachi Airis II which has a permanentmagnetic field of 0.3 Tesla. Research using a phantom object with Polyethylene Vessel containingNiCl2: 18 mmol/l. Phantom has a tube diameter 165 mm, cap diameter 120 cm and height 320 mm.Image acquisition is done with two TE value of 20 ms and 120 ms, and TR values varied from 100 msto 4000 ms, with the scale of 100 ms. Slice taken with a thickness 5 mm, and in the position 15 cm fromthe bottom of phantom. Region of interest (ROI) in the image is determined at the radius of 65 cm.SNR calculation is then performed for a variety of TE and TR. It was obtained that the SNR valueincreases exponentially for TR value of 100 ms to 700 ms and stabilized at the next TR to 4000 ms. Atthe same TR, SNR value at TE 20 ms greater than the TE 120 ms. At TE 20 ms, TR optimal value forT1WI is at 700 ms, with a SNR value of 57,6 ms, whereas for PD image on TR 3900 ms with a SNR of57,6. At TE 120 ms, TR optimal value for T2WI was at 2200 ms with SNR value of 19.Keywords: Magnetic Resonance Imaging (MRI), Time Repetition (TR), Time Echo (TE), Signal toNoise Ratio (SNR)
BERKALA FISIKA
2013-10-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/6176
BERKALA FISIKA; Vol 16, No 4 (2013): Berkala Fisika; 103-110
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/6176/5232
oai:ojs.ejournal.undip.ac.id:article/3040
2012-04-07T12:46:48Z
berkala_fisika:RA
Karakterisasi Zona Sliding Di Perbukitan Ranggawulung Subang Dengan Metoda Geolistrik Tahanan Jenis
Susanto, Kusnahadi
Zaenudin, Ahmad
Subang Ranggawulung Hills is a road connecting Bandung- Subang which is landslide-prone. Landslides have occurred in the area and now the potential for ground movement is still visible which is characterized by crack and wave roads and buildings sideway. This study characterizes the sliding zone and the direction of movement of ground geoelectric resistivity method. Geoelectrical resistivity method to detect the existence of a sliding zone of the layer surface lapsed causes that caused Landslides. Of geoelectric resistivity cross-section indicates that the contact area between the layers with a certain slope at a depth of about 3-10 m below ground surface. Fields marked with a contact layer of low resistivity value of about 5-10 m which is consistent on all tracks. By observing these results can be seen that the hills Ranggawulung potential for the occurrence of landslides, although slow moving. Key words: landslides, low resistivity
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3040
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus; D19-D24
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3040/2722
oai:ojs.ejournal.undip.ac.id:article/3057
2012-04-07T08:42:00Z
berkala_fisika:RA
Simulasi Numerik Osilator Harmonis
Edi Widodo, Catur
A program for explain movement the harmonis oscillator have been done with Python programming language version 4.2. Program was simulated simple harmonic oscillator and damped harmonis oscillator.Program was constuct by mean finite difference equation in object oriented programming Python. First, object simulation is simple harmonic motion consist spring and mass slides on a frictionless horizontal surface. Second, object simulation is damped harmonic motion consist spring, mass and piston. The result of simulation indicated that the frequency osilation depend with force constant of the spring and mass, and damped depend damping ratio and mass.
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3057
BERKALA FISIKA; Vol 10, No 3 (2007): Berkala Fisika; 127-135
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3057/2738
oai:ojs.ejournal.undip.ac.id:article/2039
2012-03-29T12:55:11Z
berkala_fisika:RA
Optimasi Tungku Sekam Skala Industri Kecil Dengan Sistem Boiler
Nawafi, F
Puspita, D
Desna, Desna
Irzaman, Irzaman
Rice husk furnace is a technology based on local wisdom to anticipate threats crisis energy. At first investigated husk stoves for cooking only in the scale of the household, but today rice husk furnace developed for industrial scale because of the importance of commercial aspects of a very promising from this rice husk furnace. In rice husk furnace also developed an industrial scale boiler system, boiler systems where it can enlarge its efficiency, in the midst of a boiler chimney pots have used, because basically rice husk furnace process is influenced by air flow. Husk furnace efficiency greatly affect the number of furnace ash which is required in the cooking process. Keywords: rice husk, rice husk furnaces, air flow, efficiency, boilers.
BERKALA FISIKA
2012-02-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2039
BERKALA FISIKA; Vol 13, No 3 (2010): Berkala Fisika; 77-84
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2039/pdf
oai:ojs.ejournal.undip.ac.id:article/9383
2015-11-05T08:35:59Z
berkala_fisika:RA
STUDI PROBABILITAS GEMPA DAN PERBANDINGAN ATENUASI PERCEPATAN TANAH METODE JOYNER DAN BOORE (1988), CROUSE (1991) DAN SADIGH (1997) DI SEKITAR WILAYAH BANDA ACEH DAN BENGKULU
Palupi, Indriati Retno
Raharjo, Wiji
Santoso, Agus
PSHA, acceleration, Joyner & Boore (19988), Crouse (1991) and Sadigh (1997) method
Sumatera is one island in Indonesia which is located near subduction zone. It is prone of earthquake, but the level of prone is not same in each province on its, like in Banda Aceh and Bengkulu. Both of them are the site of this research. Probability is one way to know characteristic or earthquake distribution on both of the site. Earthquake distribution in Aceh is more convergence than Bengkulu. It means that earthquake’s number in Aceh is more than in Bengkulu. It is done for fault source and area source of earthquake. Ground motion because of earthquake can display by acceleration and attenuation curve. It can be calculated by Joyner & Boore (1988), Crouse (1991) and Sadigh (1997) method. Keywords: PSHA, acceleration, Joyner & Boore (19988), Crouse (1991) and Sadigh (1997) method
BERKALA FISIKA
2015-01-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9383
BERKALA FISIKA; 2015: Berkala Fisika Vol. 18 No. 1 Tahun 2015; 25-42
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9383/7566
oai:ojs.ejournal.undip.ac.id:article/3073
2012-04-07T08:52:15Z
berkala_fisika:RA
Efek Magneto Optis pada Lapisan Tipis (ZnO)
Adi, Muhamad
Firdausi, K. Sofjan
Setia Budi, Wahyu
The magneto optics phenomenon on a thin film has been observed using Michelson Interferometer. The transparent materials used in the experiment is a cover glass (thickness of 1 mm) coated by the thin film ZnO (Zincite) in 54 mm of thickness. An external magnetic field which is applied to the transparent materials is in the order of 184,95 mT obtained by a coil inserted by a soft magnet and given by the alternating current. To obtain the change of refractive index, an Michelson Interferometer has been used using He-Ne laser with = 632,8 nm and output power of 1 mW. The change of phase or refractive index of ZnO is very clearly shown by the increasing of number of fringes as the magnetic fields increases. The order of the linear coefficient magneto optics is 10-10 m/V indicates that it is very reactive to a external applied field. Keywords: Michelson Interferometer, Non-linear Optics, Refraction Index and Linear Magneto-optic Coefficients
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3073
BERKALA FISIKA; Vol 10, No 1 (2007): Berkala Fisika; 31-34
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3073/2754
oai:ojs.ejournal.undip.ac.id:article/2786
2012-03-29T12:51:42Z
berkala_fisika:RA
Penyetaraan Nilai Viskositas terhadap Indeks Bias pada Zat Cair Bening
Eka Jati, Bambang Murdaka
Karyono, Karyono
Supriyatin, Supriyatin
The research to find out of the relation between viscosity of the liquid (using Viscosimeter Ostwald) to their indeks of refraction (using ABEE refractometer) have been done. It has been chossed the solution of sugar and also solution of salt, at some percentage of concentration (shown on that density variation), and measured their viscosity. Then, those solutions are measured their indeks of refraction. After that, it would be found the relation between their viscosity to their indeks of refraction. The conclusion, it could be found quite linearly graph of viscosity to indeks of refraction of sugar and salt solution for 10 up to 100% in concentration. This relation depends on kind of solution. Key words: viscosity, indeks of refraction, transparent liquid
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2786
BERKALA FISIKA; Vol 13, No 4 (2010): Berkala Fisika; 119-124
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2786/pdf
oai:ojs.ejournal.undip.ac.id:article/12804
2016-12-16T09:43:00Z
berkala_fisika:RA
PREDIKSI PERHITUNGAN DOSIS RADIASI PADA PEMERIKSAAN MAMMOGRAFI MENGGUNAKAN ALGORITMA JARINGAN SYARAF TIRUAN PROPAGASI BALIK
Arifin, Zaenal
Sutanto, Heri
Pamungkas, Adi
Setiawan, Rudi
Radiation Dose, Mammography, Artificial Neural Network, Accuracy.
Dose radiation calculation systems in mammography examination can be approximated by models of Artificial Neural Network (ANN) back propagation algorithm. In this study we performed with data from the measurement of air dose mammography and data measurement dose of radiation detectors. ANN architecture by using two inputs and one output. From the simulation results of training resulted in a correlation coefficient of 0.9994 and the MSE of 5.2907e-05. From the test results obtained by the correlation coefficient of 0.9370 dan MSE value generated is equal to 2.2026. this suggests that the neural network algorithm can be implemented to calculate the amount of radiation dose in mammography examination. Keywords: Radiation Dose, Mammography, Artificial Neural Network, Accuracy.
BERKALA FISIKA
2015-10-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/12804
BERKALA FISIKA; 2015: Berkala Fisika Vol. 18 No. 4 Tahun 2015; 151-156
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/12804/9596
Copyright (c) 2016 BERKALA FISIKA
oai:ojs.ejournal.undip.ac.id:article/3090
2012-04-07T12:35:58Z
berkala_fisika:RA
Penentuan Karakterisasi Cerrobend Sebagai “Wedge Filter” Pada Pesawat Teleterapi 60Co
Azam, Much.
Firdausi, K. Sofjan
Silvani, Sisca
Wedge filter usually used in cavum nasi ossa maxillaris tumor therapy. And usually it is made of timbal. However, cerrobend as the alternative material is possible and needed too. The material characterization is done through determining the linear absorption coeffisien of cerrobend and the proportion of the thickness of cerrobend to timbal, and as well as comparing the total treatment dose rate of timbal wedge filter with cerrobend wedge filter. Based on the result of the research, it is found that the linear absorption coeffisien value of cerrobend wedge filter with energy of 1.33 MeV is 0.43% cm-1. The average ratio of the thickness of cerrobend to timbal is 1.485 ± 0.002, and the difference of the total treatment dose rate between those two wedge filter is only a little, that is 0.72 cGy/minutes. Keywords : cerrobend, wedge filter and the linear absorption coeffisien
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3090
BERKALA FISIKA; Vol 9, No 3 (2006): Berkala Fisika; 131-135
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3090/2771
oai:ojs.ejournal.undip.ac.id:article/2869
2012-03-29T14:25:06Z
berkala_fisika:RA
UJI KECEPATAN REKONSTRUKSI CITRA PADA CT-SCAN METODE BACK-PROJECTION (BP) DAN METODE FILTERED BACK-PROJECTION (FBP) DENGAN PEMFILTERAN PADA DOMAIN SPASIAL
Ngurah Sutapa, Gusti
Anam, Choirul
Conventional X-ray have many limitations in describing the object being imaged because of overlap on multiple objects on a single line of projection. To overcome this limitation, the object was expossed in several directions, and then the projections from several directions was reconstructed to get cross-section image. The reconstruction method was widely used filtered back projection method as the development of a simple back projection. In this study will be evaluated the speed of the reconstruction for the back projection method and filtered back projection in the spatial domain. It was conducted for the projection angle from 0 to 180 degree, with interval 25, 20, 15, 10 and 5 degrees. In this research the number pixels was 50x50. It was found that the smaller of the interval of the angle projections, then it will get better results, but it takes longer. From back projection and filtered back projection methods, was obtained if the interval of the angle projections a half times smaller, it will take nearly twice as long of time. It was found that the time difference between back-projection and filtered back projection methods is less than 0.1 seconds. Keywords: Image reconstruction, back-projection, filtered back-projection, convolution
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2869
BERKALA FISIKA; Vol 14, No 2 (2011): Berkala Fisika; 33-40
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2869/2554
oai:ojs.ejournal.undip.ac.id:article/3106
2012-04-07T12:42:18Z
berkala_fisika:RA
Rancang Bangun Alat Ukur Konduktivitas Panas Bahan Dengan Metode Needle Probe Berbasis Mikrokontroler AT89S52
Syaefullah, Rakhmat
Yulianto, Gatot
Suryono, Suryono
A device for measuring thermal conductivity of homogen materials using a Needle Probe method has been designed. This method uses a metal rod which emited a heat stream and a temperature sensor placed in the middle of interior heater at probe to measure changes in temperature inside the probe. This measuring instrument represent development digitally from measuring instrument which have been made with analog system. With AT89S52 microcontroller application as data processor bases, temperature detected can be presented by sevent segment which have been controlled by BCD converter. Basically thermal conductivity measuring instrument with this Needle Probe method represent a digitally thermal detecting system which attached at Needle Probe. Every increase 1 0C, the temperature censor give output equal to 0.01 V with correctness of displayed equal to 1 0C and error point level equal to 0.01 %. Key word: Needle Probe method, ADC, AT89S52 microcontroller, seven segment.
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3106
BERKALA FISIKA; Vol 9, No 1 (2006): Berkala Fisika; 37-42
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3106/2787
oai:ojs.ejournal.undip.ac.id:article/2924
2012-03-30T14:33:07Z
berkala_fisika:RA
Interpretasi Bawah Permukaan Daerah Manifestasi Panas Bumi Parang Tritis Kabupaten Bantul DIY Dengan Metode Magnetik
Indratmoko, Putut
Nurwidyanto, M. Irham
Yulianto, Tony
Abstract Acquisition of geomagnetic field has been done at Kretek, Sanden, Pundong, Bantul and Panggang, Gunung Kidul, Yogjakarta Province on 14 s/d 17 October and 7,8,9,12 November 2009 in orde to interpreted the subsurface structure. Data has been collected by Proton Precession Magnetometer (PPM) to measured the total intensity of magnetic field, Global Positioning System (GPS) to determine the position and geology compass to the direction of north pole. The raw data has been processed and performed using IGRF (International Geomagnetics Reference Field) correction to obtain total field magnetic anomaly. Upward continuation was performed at 300 meters heigh by Magpick. Qualitative interpretation was done by analyzing regional and local anomaly maps. Quantitative interpretation was done 2 ½ D modelling cross-sectionanomaly maps using Mag2DC for Windows Software. The result of 2-D modeling produces anomaly objects was susceptibility value (0,0405) in cgs unit for the first object, susceptibility value (0,0425) in cgs unit for the second object, susceptibility value (-0,0085) in cgs unit for the third object. The anomaly objects had depth in +580 meters from the surface and was considered the rock which had been experience demagnetitation proses. Key word: magnetic anomaly, Parangtritis, susceptibilities.
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2924
BERKALA FISIKA; Vol 12, No 4 (2009): Berkala Fisika; 153-160
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2924/2612
oai:ojs.ejournal.undip.ac.id:article/4986
2013-05-27T14:17:30Z
berkala_fisika:RA
APLIKASI IMC BERBASIS STRATEGI PENALAAN PENGENDALI PID DIGITAL PADA SISTEM PEMANAS UDARA
Khuriati RS, Ainie
This paper investigated an application of the methodology that was developed by Rivera, a methodology to obtain reduced-order models that satisfy the Prett-Garcıa digital PID tuningrules, using prefiltered ARX estimation as a basis. The method was applicated as the temperaturecontrol system on theair heater. IMC-PID controller is not only superior but it has a simple andgeneral structure such as that of a PID controller too.Keywords: PID digital , IMC, ARX model.
BERKALA FISIKA
2012-04-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4986
BERKALA FISIKA; Vol 15, No 2 (2012): Berkala Fisika; 33-40
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4986/4519
oai:ojs.ejournal.undip.ac.id:article/2976
2012-04-03T12:34:42Z
berkala_fisika:RA
Rancang Bangun Generator Pulsa Gelombang Ultrasonik dan Implementasinya untuk Pengukuran Jarak Antara Dua Obyek
Syafrudin, Agus
Suryono, Suryono
Endro Suseno, Jatmiko
An instrument of pulse generator of ultrasonic wave and its implementation for distance measurement between two objects have been created through analysis using oscilloscope. This ultrasonic wave may be used in a distance measurement, material reflection analysis, and product’s depth. An ultrasonic oscillator is made with set of IC 555 as the setter of pulse amount and multi vibrator mono stabile set of IC 555 as the oscillator of ultrasonic frequency, pulse amplifier through transistor BD 139. An ultrasonic transducer using transducer 400ST/R160 and micro controller AT89S51 is used for time setter. In the amplifier set of ultrasonic receiver, Op-amp CA 3204 is used. AT89S51 is used for time setter that is made repeatedly in order that the bounce may be read on oscilloscope through P1.0. After conducting an experiment, the effective working area frequency in pulse generator of ultrasonic wave is obtained in the frequency of 38.23 kHz. In the experiment on the amount of effective pulse, the maximum reach effectively is 16 pulses. In the experiment on the distance between two objects, the writer finds out that an instrument linier grade is 0.81773 against standard measurement with R=0.99954 and SD=0.457. Meanwhile on the material reflectivity test, the writer may concludes that the bigger material mass, the bigger its reflectivity. Keywords: pulse generator of ultrasonic wave, transducer
BERKALA FISIKA
2012-04-03
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2976
BERKALA FISIKA; Vol 11, No 2 (2008): Berkala Fisika; 29-37
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2976/2661
oai:ojs.ejournal.undip.ac.id:article/5004
2013-05-27T15:53:42Z
berkala_fisika:RA
PENGARUH TANGGAPAN DETEKTOR KAMERA GAMMA SPECT PADA PEMERIKSAAN GINJAL
Arifin, Zaenal
Soejoko, Djarwani S
In nuclear medicine, it is common to exam by using SPECT / SPECT-CT for planar ortomographic imaging. SPECT aircraft can be equipped with one or more detectors. The studyaims to determine the response to the two detectors in SPECT gamma cameras. Furthermore, eachdetector used for renal function. The study consisted of two phases, the first to determine theresponse of each detector using acrylic phantom and the source of Technetium-99m activity of1mCi to 25 mCi. The second stage, renal function tests with planar imaging in four patients usingdetector 1 and detector 2. Acrylic phantom measurement results show the detector response 1 wasrelatively higher. Although the detector 2 has a lower response but is still linear with respect to the activity. In the examination of the kidneys, the evaluation focused on image analysis, count rate, uptake, GFR and transit function of time. The fourth image shows the patient count rate ofdetector 1 is also relatively high. Left kidney uptake value detection results both detectors showedno significant differences, with a mean value (48.3 ± 3.9)% and (51.7 ± 2.2)% for detector 1 anddetector 2. Both detectors generate GFR values in all four patients were in the range of 58-96 ml /min of detector 1 and 75-98 ml / min of detector 2. The results of these two detection detectortransit time function shows the left kidney patients in all phases of the four showed no significantdifferences. It was concluded that the two detectors have relatively low response but is still linearwith respect to the activity. Therefore detector 2 can still provide diagnoses did not differsignificantly with detector 1.Keywords : SPECT, Technetium-99m, response of detector, Examination of Renal
BERKALA FISIKA
2013-01-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5004
BERKALA FISIKA; Vol 16, No 1 (2013): Berkala Fisika; 27-32
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5004/4537
oai:ojs.ejournal.undip.ac.id:article/5259
2013-08-01T09:45:04Z
berkala_fisika:RA
EVALUASI KUALITAS BEBERAPA JENIS MINYAK GORENG KEMASAN SETELAH DIPANASKAN MENGGUNAKAN SIFAT ELEKTROOPTIS
Murni, Sri
Bawono Putranto, Ari
Hidayanto, Eko
Firdausi, K Sofjan
In this report, we have determined the average value of polarization angle for various edible oils, before and after heating. The change of polarization angle was measured averagebetween potential differences 0-9 kV. The heating time for the samples was conducted up to 10 hours at average temperature by 180°C. The source of light was He-Ne Laser 1 mW (633 nm) with optical length of samples of 1 cm. In agreement to the previous experiment, our result shows that all vegetable oils provide increasing of free radicals indicated by increasing polarizationangle for longer heating time. For the heating time interval 0-10 hours, the level degradation ofoil rises quadratically. From various edible oils, olive oil is still the relative best quality from allsamples in this experiment. This method, once again, shows more powerful relative to otherstandard methods.Keywords: frying oil, electrooptics, polarization angle
BERKALA FISIKA
2013-07-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5259
BERKALA FISIKA; Vol 16, No 3 (2013): Berkala Fisika; 63-66
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5259/4744
oai:ojs.ejournal.undip.ac.id:article/3035
2012-04-06T07:42:41Z
berkala_fisika:RA
Pengaruh Aliran Gas Nitrogen Pada Karakteristik Listrik Film Gan Yang Ditumbuhan Di Atas Substrat Silikon (111) Dengan Teknik Sol Gel Spincoating
R. Tayubi, Yuyu
Rusdiana, Dadi
GaN thin films have been successfully grown on silicon substrate (111) by sol gel technique spincoating with nitrogen gas flow variation. GaN films were characterized using X-ray diffraction, SEM and electrical characteristics. The results showed that the film has a polycrystalline structure, while the electrical characterization of resistivity measurements on several samples of GaN films with the variation of N2 gas flow rate showed that the electrical resistivity of films decreased when the rate of N2 gas flow is increased. Keywords: GaN, sol gel spincoating, resistivity.
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3035
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus; C49-C52
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3035/2717
oai:ojs.ejournal.undip.ac.id:article/6579
2014-03-21T15:24:37Z
berkala_fisika:RA
Analisis Keseragaman Citra pada Pesawat Ultrasonografi (USG)
Sudarsih, Kesawa
Setia Budi, Wahyu
Suryono, Suryono
The computer base system to determine uniformity of ultrasonography image quality has been developed at various attenuation(dB) and Time Gain Compensator (TGC).The equipment used in this study was 2-dimensional ultrasonic apparatus and multi-purpose multi-tissue phantom models 040GSE. Data collection was performed by scanning the phantom using a linear transducer with a frequency of 8 MHz. The mean and standard deviation of image density of it ROI calculated used computer base system then analyzed with trendline if the image density value in the range between mean and sd it means image uniform. The result shows that the uniformity of the image is influenced the value of attenuation and TGC. This value increase proportional with increasing attenuation. For greater value of the TGC the uniformity tends downward. At 45-60 dB obtained distribution image uniformity sd value is 0.20 and 0.28, and at minimum up to maximum TGC obtained distribution image uniformity sd value is 0.33 and 0.48. This value can be used for quality assurance reference of USG equipment. Keyword : USG Equipment, Uniformity, Region of Interest, Digital Image Processing
BERKALA FISIKA
2014-01-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/6579
BERKALA FISIKA; 2014: Berkala Fisika Vol. 17 No. 1 Tahun 2014; 33-38
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/6579/5413
oai:ojs.ejournal.undip.ac.id:article/3052
2012-04-06T20:19:30Z
berkala_fisika:RA
Studi Radiografi Makro Dengan Variasi Jarak Sumber Sinar-Bayangan (SID) dan Ukuran Fokus Terhadap Pembesaran Bayangan
Suriansyah, Nanang
Setiawati, Evi
Firdausi, K. Sofjan
The dependence of radiograph magnification (M) on the ratio focal spot size to object ( has been studied. The object shape like a coin made from iron which different diameter and variation focal spot size have been used. The experiment condition were set up at the distance of the object to the film of 0 cm (object stick the film) and 45 cm, with the tube voltage of 50 kV, tube’s current of 100 mA, and time of 0.04 s. The results show that the increasing of (leads to the increasing of (M) when the distance of the object to the film is more than 0 (b>0). Keyword: focal spot, SID, magnification radiograph
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3052
BERKALA FISIKA; Vol 10, No 4 (2007): Berkala Fisika; 187-192
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3052/2733
oai:ojs.ejournal.undip.ac.id:article/9297
2015-10-19T16:18:16Z
berkala_fisika:RA
IDENTIFIKASI FOKUS MIKROSKOP DIGITAL MENGGUNAKAN METODE OTSU
Putranto, Ari Bawono
Adi, Kusworo
Gernowo, Rahmat
A study to identify focus on a digital microscope has been done using a threshold value of the object microscope image obtained by Otsu method. Microscope image of the object captured by the change from a maximum to a minimum distance between the object and the microscope objective lens to record the amount of movement of a motor stepper and calculates the Otsu threshold value on each image. Based on data from a Otsu threshold value of each microscope image of the object to the changes within the object can be inferred the existence of a relationship between the position of an object to focus the microscope with the image of the threshold value that is increasingly the focus of an image , the image of the Otsu threshold values obtained are also getting smaller. In this study done by testing two samples as objects of microscope that single hair samples and samples collection of several hairs were each placed on a microscope glass slide. Data collection and observation results show that for a single hair samples obtained object focus Otsu threshold value T = 97 and sample an object consisting of a collection of some of the hair is obtained Otsu threshold value T = 127. But the testing of two samples showed differences influenced by the ratio between the number of pixels on the image and the background image of an object caused by the influence of the intensity of the light source of the microscope. Keywords: Focus Identification, Digital Microscope, Otsu Threshold
BERKALA FISIKA
2014-10-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9297
BERKALA FISIKA; 2014: Berkala Fisika Vol. 17 No. 4 Tahun 2014; 139-144
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9297/7509
oai:ojs.ejournal.undip.ac.id:article/3068
2012-04-07T08:47:22Z
berkala_fisika:RA
SIMULASI GERAK PARTIKEL BERMUATAN DALAM PENGARUH MEDAN LISTRIK DAN INDUKSI MAGNET MENGGUNAKAN MATLAB VERSI 7.1
Azam, Much.
Kusbramanto, Tomy
Endro Suseno, Jatmiko
Charged particle motion under external electric, magnetic induction, and electric-magnetic induction field simulation program has been made using MATLAB ver. 7.1 to get the visual description of charged particle motion. The simulation program is made based on non relativistic Lorentz equation. Each of charged particle’s position and velocity components, which is moved under external electric and or induction magnetic filed(s), is numerically computed using forth order Runge-Kutta method and be made visible by the simulation program. Proper test of the simulation program is made using known text book as the reference. Simulation results which made of 3D profile of charged particle’s motion path and each velocity components has already shown that it have good relationship with the known text book Keywords : charged particle motion, position, velocity
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3068
BERKALA FISIKA; Vol 10, No 2 (2007): Berkala Fisika; 99-103
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3068/2749
oai:ojs.ejournal.undip.ac.id:article/2708
2012-03-29T15:32:53Z
berkala_fisika:RA
Pengaruh Penggunaan Cermin Datar Dalam Ruang Tertutup Pada Sel Surya Silikon
Sidopekso, Satwiko
Yumanda, Vony
Efforts to optimize the electrical output of solar modules by maximizing the intensity of light that falls onto the surface of solar modules using a flat mirror (mirror room). The results obtained revealed that there is increasing output of solar modules. Value of Isc, Voc and the highest P consecutive outs in the amount of amperage 2:13; 20.483 35.34 volts and watts. While the value of Isc, Voc and the highest P out without a mirror room which was 0.78 amperes, respectively; 19.24 volts and 12 watts. Percentage increase in solar module output power can reach 64.22%, the highest efficiency solar module to the mirror room of 13.47% by using low lamp power. Keywords: Solar Module; Electric Output Optimalization; Mirror Room
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2708
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika; 73-76
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2708/pdf
oai:ojs.ejournal.undip.ac.id:article/10838
2016-04-21T12:14:04Z
berkala_fisika:RA
PEMANFAATAN METODA INVERSI DAN PROBABILISTIC NEURAL NETWORK PADA DATA SEISMIK DALAM PENENTUAN ZONA RESERVOAR BATUGAMPING (CARBONATE BUILDUP) DI LAPANGAN SUKO, CEKUNGAN JAWA TIMUR UTARA
Novianto, Ardian
AI inversion, Multi-attribute PNN, Carbonate Buildup
Limestone particularly Carbonate Buildup is one type of reservoir potential as a hydrocarbon accumulation. Problems often encountered in the analysis are the type of reservoir porosity deployment complexity that is very different from other rocks. The understanding of porous area as a zone of a reservoir in the body Carbonate buildup will provide an overview in the development and determination of drilling new wells. Identification of potential zones in carbonate buildup can be done with the approach of the seismic data inversion process and multi-attribute with neural network method. Seismic inversion process is the reverse of the forward modeling process which will produce Acoustic impedance value that describes not only the boundary between the layers but also a layer of rock itself (Layer Properties). Validation of the results of the inversion process is done by creating a density map using multi-attribute process with probabilistic neural network method. The results of the inversion and multi-attribute process is expected to provide an overview of the deployment area having a large porosity which can serve as a reservoir zone. The results from the combination of the two methods showed that the reservoir zone is in the central part of carbonate buildup that field through the development of new drilling process can be directed at the zone. Keywords: AI inversion, Multi-attribute PNN, Carbonate Buildup
BERKALA FISIKA
2015-07-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/10838
BERKALA FISIKA; 2015: Berkala Fisika Vol. 18 No. 3 Tahun 2015; 117-124
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/10838/8573
oai:ojs.ejournal.undip.ac.id:article/3084
2012-04-07T12:33:55Z
berkala_fisika:RA
Pereduksian COX, NOX, SOX, HC dari Kendaraan Bermotor dengan Menggunakan Plasma Non-Termik
Nur, Muhammad
Wirawan, Bukit Yuta
Adi Wijaya, Wahyu
Suseno, Ahmad
Sumariyah, Sumariyah
Reduction NOX gas from motor vehicle 1486 cc emission have been done by using corona glow discharge plasma which awakened with power source from modified system ignition of car.NOX Gas is result emission of motor vehicle 1486 cc at 2000 rpm. Flow NOX source are joined with reactor. Corona glow discharge plasma awakened in the reactor with knife to plane electrode geometry configuration with power source from modified system ignition of car. Corona that happened in reactor which containing of motor vehicle gas emission 1496 cc will yield ion, electron, and energetic radical. NOX will turn into compounds which do not dangerous and it’s indicate that pollutants in reactor was reduced. To get the decomposition efficiency of NOX it’s require to be done the measurement of concentration of NOX before and after reduced. The biggest decomposition efficiency of NOX which obtained in this research is 81.38 % at distributor rotation equal to 1500 rpm with current equal to 80µA. Anion and cation analysis show there are cation NH4+ and anion CO32-, SO32-, and SO42-, that giving hypothesize that one of compiler compound of crust result of system prototype to reduce NOX are ammonium carbonate ((NH4)2CO3), ammonium sulfide ((NH4)2SO3), and ammonium sulphate ((NH4)2SO4).
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3084
BERKALA FISIKA; Vol 9, No 4 (2006): Berkala Fisika; 209-219
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3084/2765
oai:ojs.ejournal.undip.ac.id:article/2832
2012-03-29T11:52:24Z
berkala_fisika:RA
Analysis of Sodium, Potassium and Calcium using a Portable Liquid Electrode Plasma Optical Emission Spectrometer
Hidayanto, Eko
Yamamoto, Takashi
Kawai, Jun
Elements of sodium (Na), potassium (K) and calcium (Ca) in beverage samples and river water were analyzed with portable liquid electrode plasma - optical emission spectrometer (LEP-OES). The degree of reproducibility for emission intensities and individual variety of a disposal sample chip were investigated, and measuring conditions for quantitative analysis and the precision was discussed. The sensitivity for Na was higher than those for K and Ca by one or two orders of magnitude. Several ppm of Na and K, and several hundred of Ca in aqueous samples could be quantitatively analyzed with 2-30% of deviation without internal standard. The applied voltage was predominant factor for accurate quantitative analysis, and 800 V was found to be the best voltage estimation for quantitative analysis of alkaline metals contents.
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2832
BERKALA FISIKA; Vol 14, No 1 (2011): Berkala Fisika; 27-32
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2832/2516
oai:ojs.ejournal.undip.ac.id:article/12800
2016-12-16T09:42:04Z
berkala_fisika:RA
oai:ojs.ejournal.undip.ac.id:article/3101
2012-04-07T12:40:37Z
berkala_fisika:RA
KAJIAN AWAL SIFAT OPTIS TAKLINIER BAHAN TRANSPARAN DALAM MEDAN LISTRIK STATIS
Prabowo, Krisno
Firdausi, K. Sofjan
Azam, Much.
In this paper, we study non linear optical characteristics of some transparency media in a static external electric field, E. The samples used in this experiment are mineral water, salt solution, and sugar solution. The optical characteristic investigated here is the change of polarization angle,b, of laser He-Ne after pass through the sample, against E. The strength of electric field is produced by high voltage (0-2000 volt) applied on two parallel plates (size 28 × 28 cm2). It is assumed that E inside the plates is homogeneous and fulfilled by relation of E = V/d. Results of experiment show that three samples have the tendency of b µ E in this experimental condition assumed to be optimal. For weak (mineral water) and strong (salt solution) electrolyte solution, we obtain a significant difference of gradient, that shows how dominant the electric dipoles in salt more than in mineral water. Other wise, change of b vs. E in sugar solution has only significant initial value of b. The tendency of b µ E is just only due to the contribution of dipoles of water molecules in sugar solution, since the sugar molecules is non polar.
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3101
BERKALA FISIKA; Vol 9, No 1 (2006): Berkala Fisika; 1-4
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3101/2782
oai:ojs.ejournal.undip.ac.id:article/2920
2012-03-30T14:32:05Z
berkala_fisika:RA
PEMBUATAN SOFTWARE PENCATAT PENGUNJUNG PERPUSTAKAAN MENGGUNAKAN BARCODE DAN MYSQL BERBASIS BORLAND DELPHI 7.0
Apriana, Apriana
Danusaputro, Hernowo
The library visitors counter system using barcode and MySQL based with Borland Delphi 7.0 has been done for ease in counting the visitors in a library and data to be displayed more accurate and comprehensive. Bar code which printed on visitors card is aimed at barcode scanner to read the code of the identity of visitors who will enter the library. At Borland Delphi 7.0 uses the pascal programming language that is integrated with the input of barcode and database MySQL able to display the time visitors enter the library. From this research it was found that Borland Delphi 7.0 software can read the records in the MySQL database and display properly on a monitor in accordance with the data stored on the visitors database. Keywords : library, barcode scanner, Borland Delphi 7.0, code barcode, MySQL
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2920
BERKALA FISIKA; Vol 12, No 4 (2009): Berkala Fisika; 125-130
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2920/2608
oai:ojs.ejournal.undip.ac.id:article/4980
2013-05-27T11:13:59Z
berkala_fisika:RA
MAGNETIZATION AND POLARIZATION PROFILE IN PML-TYPE MAGNETOELECTRIC MULTIFERROICS WITH CANTED SPIN SYSTEM
Gunawan, Vincensius
Stamps, Robert L
We calculate the profile of both magnetization and polarization of a PML-typemagnetoelectric multiferroics which allow the magnetization of sub-lattices to be canted. Thecalculation is started by deriving the Landau energy density and followed by solvingsimultaneously three equilibrium equations which respect to polarization, magnetization andcanting angle. It is predicted that magnetoelectricity give rise to a “bump” in polarization profile. It is also calculated that the application of a magnetic/an electric field will also influence thepolarization/magnetization of the material.Keywords: multiferroics, magnetization and polarisation
BERKALA FISIKA
2012-01-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4980
BERKALA FISIKA; Vol 15, No 1 (2012): Berkala Fisika; 27-32
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4980/4513
oai:ojs.ejournal.undip.ac.id:article/2964
2012-04-03T11:49:02Z
berkala_fisika:RA
Rancang Bangun Pengatur Cermin Sebagai Komponen Gerak Interferometer Pada Spektroskopi FTIR
Adi Wibowo, Wahyu
Edi Widodo, Catur
Azam, M.
Firdausi, K. Sofjan
Michelson's interferometer and mirror regulator system as components of its power have been designed. Interferometers stirred component is one of monotonic mirror on optic system. Interferometer is made accords Michelson's Interferometer attempt. Mirror M1 and mirror M2 is assembled mutually upright then one beam splitter placed before both of mirror. One laser light source is given before mirror M1 crosses beam splitter. There is a detector before mirror M2 crosses beam splitter upright with laser light source. Mirror M1 is made flexible by assembled gear and stepper's motor to be able forward or backward motion then so called moveable mirror. Stepper's motor is turned around by computer via parallel port. From interferometer engineering and mirror regulator system already been made, gotten interference pattern with ring amount that the less each mirror gets forward motion and ring amount that more and more each mirror moves to backward. Shift moveable mirror every step for forward or backward is 1,5 µm with distance sails through maximal be 6,0 mm. The in common result point out that interferometer and regulator system of moveable mirror show feature changed interference pattern along with mirror move. Key word: interferometer, moveable mirror, motor stepper, parallel port.
BERKALA FISIKA
2012-03-30
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2964
BERKALA FISIKA; Vol 11, No 3 (2008): Berkala Fisika; 79-87
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2964/2650
oai:ojs.ejournal.undip.ac.id:article/4999
2013-05-27T15:52:46Z
berkala_fisika:RA
REVIEW PENGUJIAN HUKUM MALUS DAN SIFAT OPTIS AKTIF LARUTAN GULA MENGGUNAKAN SISTEM DETEKSI CAHAYA
Amitasari, Ria
Istiyawan, Wardono
Sugito, Heri
Bawono P, Ari
Firdausi, K Sofjan
Abstract In this paper, we review the test results of Malus’ Law and optical activity of sugarsolution using a system light detector. Two polarizers were used in the experiment to serve thechoice of a certain direction of electric field of light and to determine the change of polarizationangle. The change of transmitted intensity were measured using LDR detector which was thenacquisitioned by microcontroller and displayed via LCD and computer using Microsoft Visual Studio C#. The experiment result is in agreement to the Malus’ Law with correlation coefficient of 0.99, and by using the equipment we obtain linearity between the change of polarization angle andconcentration of sugar solution, which is appropriate to the theory, as well. The specific rotarypower is (54±2) o/dm(g/mL) in the experimental uncertainty.Keywords: Malus law, change of polarization angle, light detector
BERKALA FISIKA
2013-01-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4999
BERKALA FISIKA; Vol 16, No 1 (2013): Berkala Fisika; 1-4
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4999/4532
oai:ojs.ejournal.undip.ac.id:article/2995
2012-04-04T06:00:59Z
berkala_fisika:RA
Persamaan Fokker Planck dan Aplikasinya Dalam Astrofisika
Palupi, Dwi Satya
Abstract It has been established Fokker-Planck equation to obtain the evolution of particle distribution functions that describe the motion of particles in a fluid that can not be described by the Liouville equation. Fokker-Planck equation contains a diffusion component particles and the interaction between the particles will be discussed application of Fokker-Planck equation in astrophysics since the plasma in the form of interstellar space so that there is interaction between the particles making up the plasma. Keywords: Fokker-Planck, plasma, astrophysics
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2995
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus; A1-A6
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2995/2679
oai:ojs.ejournal.undip.ac.id:article/5212
2013-07-30T08:52:16Z
berkala_fisika:RA
PEMANFAATAN SIFAT OPTIS AKTIF ALAMI UNTUK KENDALI MUTU MINYAK GORENG MENGGUNAKAN LAMPU PIJAR
Asy Syifa, A Y
Nisa, Fathia
Prasanti, Irvani D
Murni, Sri
Firdausi, K Sofjan
In this study the properties of natural optical activity of the various vegetable cookingoils was used as a new method for a quality control and was proposed as a new prospect forpreliminary test of oil quality. The samples used were various packaging cooking oil obtained inthe shops and were considered already fulfilled by SNI. The source of light to illuminate was a75W light-bulb. The change of the polarization angle of light was measured using polarizer basedon Malus’ law, and it was used to indicate the levels of oil quality degradation. The experimentalresult shows that highest change of polarization angle indicates relative lowest quality of oils. Anolive oil shows the best oils relative from other types of vegetable oils. The natural polarization inthis case is able to differentiate between various types of oil, and to distinguish fresh oil andexpired oil. It seems that natural polarization accommodates some contributed components oflevel of degradation of oil quality, i.e. free fatty acid and saturated fat. This method provides someadvantages, such as, simple equipments, a fast test, without preliminary treatment, and accurateresults. For the future, it shows a reliable test to conduct as a previous quality control for cookingoil and replaces the role of conventional, expensive standard methods. This method offers also achallenge to evaluate the level of authentication or halal of oils and fats.Keywords: oil quality, polarization angle, optical activity.
BERKALA FISIKA
2013-04-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5212
BERKALA FISIKA; Vol 16, No 2 (2013): Berkala Fisika; 33-40
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5212/4712
oai:ojs.ejournal.undip.ac.id:article/3029
2012-04-05T15:01:55Z
berkala_fisika:RA
Kajian Efisiensi Energi Proses Penyulingan Dan Sifat Fisik Hasil Penyulingan Minyak Serai Dapur Menggunakan Tungku Sekam Dan Heating Mantel
Rohaeti, E.
Pamungkas, N. G.
Irzaman, Irzaman
Essential oil distillation has been carried out from the lemongrass material using two heaters there are rice husk and heating mantel. In comparison ingredients (lemongrass: water = 0.125 kg: 0.5 liters) distillation with rice husk heater requires energy 6022.5 kcal, 3660 second distillation time, costs Rp 912.5 with an average rendemen of oil produced 0.0635 %. Distillation with the same material amount using heating mantel requires the energy 832.143 Kcal, distillation time 6990 seconds, the cost Rp 608.6 and producing the rendemen 0.114%. Distillate debit is influenced by the heat generated which produced by the rice husk and heating mantel. The quality of lemongrass oil which produced by the rice husk heating is better than the heating mantel in term of the lemongrass oil color and oil refractive index. Lemongrass oil which is produced by the pale brown of heating rice husk and refractive index values were in the range of 1.4830 to 1.4890. Keywords: rice husk, heating mantel, distillation, lemongrass oil, energy.
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3029
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus; C13-C20
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3029/2712
oai:ojs.ejournal.undip.ac.id:article/6574
2014-03-21T15:21:34Z
berkala_fisika:RA
Analisis Produksi Ozon dalam Reaktor Dielectric Barrier Discharge Plasma (DBDP): Pengaruh Impedansi Elektroda Spiral
Restiwijaya, Maryam
Nur, Muhammad
Winarni, Tri A
Analysis of spiral-cylinder DBDP reactor on atmospheric pressure was done to explain spiral electrode impedance influence on ozone production. Variation of coil number (N): 10, 20, 30, 40, and 50 coil spiral applied to the spiral electrodes. Spiral electrode made of a copper wire with 0.4 mm in diameter and the inner and outer coils of each was 20 mm and 20.4 mm. Pyrex Tubing in diameter 3 cm and a thickness of 1 mm serves as a dielectric barrier cover spiral electrode. Cylindrical electrodes made from a copper plate with a length of 13.70 cm and thickness of 0.47 mm. a High voltage of AC has been used with a voltage up to 10 kV with frequency of 16 kHz. Free air supplied into the reactor with air flow rate of 6 L/minute. The results showed that at a constant N, ozone concentration decreased with the increasing value of the impedance (Z). Reactor DBDP most effective in terms of electricity consumption is on the DL = 20 mm, DK = 0.4 mm, and the number of coil N = 10 coils of wire with a power that is as high as 177.60 Watt and Z=3,60x105Ω. Keywords : Number of coil, Spiral-cylinder electrodes, Ozone concentrations
BERKALA FISIKA
2014-01-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/6574
BERKALA FISIKA; 2014: Berkala Fisika Vol. 17 No. 1 Tahun 2014; 1-6
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/6574/5408
oai:ojs.ejournal.undip.ac.id:article/3046
2012-04-07T12:48:36Z
berkala_fisika:RA
Desain Model Pembelajaran Untuk Meningkatkan Kemampuan Pemecahan Masalah Dalam Pembelajaran IPA (Fisika) Sekolah Menengah Pertama Di Kota Bandung
Taufik, Mohammad
Sukmadinata, Sukmadinata
Abdulhak, Ishak
Y. Tumbelaka, Bernard
Penelitian ini dilatarbelakangi oleh masih rendahnya literasi sains yang mencakup kerja ilmiah dan kemampuan pemecahan masalah khususnya pada mata palajaran IPA (Fisika). Melalui penelitian ini dikaji permasalahan yaitu bagaimana model pembelajaran yang dapat diterapkan untuk meningkatkan kemampuan pemecahan masalah dalam pembelajaran IPA (Fisika) di SMP. Tujuan penelitian adalah untuk mendesain model pembelajaran yang dapat diterapkan dalam meningkatkan kemampuan pemecahan masalah pada mata pelajaran IPA (Fisika) di SMP kelas VIII. Penelitian dilaksanakan di SMP di Kota Bandung menggunakan pendekatan research and development. Proses dilaksanakan melalui tahapan: studi pendahuluan untuk mendapatkan landasan pengembangan model dan pengembangan untuk mendapatkan model hipotetik melalui dua kali ujicoba. Berdasarkan penelitian ini diperoleh simpulan: Pertama, model pembelajaran Peningkatan Kemampuan Pemecahan Masalah (PKPM) dapat diterapkan pada mata pelajaran IPA (Fisika) di SMP kelas VIII dengan karakteristik materi pelajaran bersifat kontekstual dalam bentuk masalah yang harus dipecahkan melalui eksperimen. Metode pembelajaran yang digunakan menempatkan siswa sebagai subjek belajar serta guru sebagai fasilitator belajar. Interaksi pembelajaran dilaksanakan melalui tanya-jawab, penyelidikan/eksperimen, kolaboratif, dan latihan. Implementasi model meliputi: (1) Pendahuluan yang meliputi penjelasan singkat tentang tujuan dan proses pembelajaran, pengembangan suasana partisipatif, orientasi masalah kontekstual, dan pengorganisasian siswa; (2) Inti yang meliputi penyelidikan/eksperimen kolaboratif, penyajian hasil karya, pemberian penghargaan, dan latihan pemecahan masalah; serta (3) Penutup yang meliputi analisis dan evaluasi proses pemecahan masalah dalam bentuk refleksi serta rekonstruksi pemikiran dan aktivitas proses pembelajaran. Kedua, implementasi model pembelajaran PKPM merupakan salah satu upaya yang dapat digunakan untuk memperbaiki kualitas proses dan hasil pembelajaran IPA (Fisika) di SMP kelas VIII. Dampak penggunaan model tersebut antara lain: (1) Meningkatnya peran siswa dalam pembelajaran dan membuka peluang bagi siswa untuk melakukan kerja ilmiah; serta (2) Peningkatan kemampuan pemecahan masalah, penguasaan konsep, dan menumbuhkan kebiasaan berpikir dalam menyikapi masalah. Kata kunci: Model Pembelajaran, Peningkatan Kemampuan Pemecahan Masalah, Konstruktivisme, Berpikir Reflektif.
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3046
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus; E31-E44
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3046/2728
oai:ojs.ejournal.undip.ac.id:article/8881
2015-08-01T18:12:38Z
berkala_fisika:RA
PERANCANGAN DAN PEMBUATAN SENSOR TDS PADA PROSES PENGENDAPAN CaCO3 DALAM AIR DENGAN METODE PELUCUTAN ELEKTRON DAN MEDAN MAGNET
Martani, Maylita
Endarko, Endarko
Total Dissolved Solids (TDS) meter has successfully been fabricated based on the principle of conductivity. Control system for monitoring the TDS level in the mini plant have been performed by microcontroller ATMega16 and Personal Computer. The study was to control a precipitation process of CaC03 in the water. Values of TDS from water sample in the mini plant have been monitored and controlled in real-time. All data have been recorded by microcontroller and then, the data will be sent to personal computer via USB interface. Monitoring data will be displayed in a computer screen. The result showed that the system could be used to control level of TDS at 356 - 300 ppm. Keywords : gravity of CaC03, Conduktivity, Control
BERKALA FISIKA
2014-07-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/8881
BERKALA FISIKA; 2014: Berkala Fisika Vol. 17 No. 3 Tahun 2014; 99-108
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/8881/7216
oai:ojs.ejournal.undip.ac.id:article/3063
2012-04-07T08:46:13Z
berkala_fisika:RA
PEMODELAN ZONA SESAR OPAK DI DAERAH PLERET BANTUL YOGYAKARTA DENGAN METODE GRAVITASI
Nurwidyanto, M. Irham
Dwi Indriana, Rina
Thaha Darwis, Zukhrufuddin
A gravity research was done in Pleret, Bantul, Yogyakart.It’s covering 55 measurements points. This research aims to estimated subsurface structure fault zone of the area, correctly along Opak River’s. Type of Gravitymeter La Coste & Romberg G-1118 using electronics feedback system with accuracy 0.005 miligal was used to measure gravitational field. Interpretation result from kualitative and kuantitative are estimated the structure in the research area consist of tree layer that arre limestone, breccia, and alluvial sediment and Opak sediment’s
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3063
BERKALA FISIKA; Vol 10, No 2 (2007): Berkala Fisika; 65-70
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3063/2744
oai:ojs.ejournal.undip.ac.id:article/2704
2012-03-29T15:32:53Z
berkala_fisika:RA
Investigasi Bidang Gelincir Tanah Longsor Menggunakan Metode Geolistrik Tahanan Jenis di Desa Kebarongan Kec. Kemranjen Kab. Banyumas
Sugito, Sugito
Irayani, Zaroh
Permana Jati, Indra
Investigation of landslide slip surface using geoelectrical resistivity method has been conducted at Kebarongan Village, Kemranjen District, Banyumas Regency. Data acquisition by means Schlumberger and Wenner configuration. Data processing and interpretation were using Progress version 3.0 and Res2Dinv version 3.54 softwares. The output of Progress software were depth, number of layers, and values of rock resistivity. Mean while the output of Res2Dinv were resistivity section, RMS, and depth of rock layers. The interpretation result showed that at Kebarongan village lithology consist of four layers i.e. top soil, sandy clay, wet clay and sandy clay. Slip surface is wet clay with depth of 10.31 until 14.21 m. The slip surface orientation is same of slope area that is to south and the type of landslide is translational. Keywords: geoelectrical resistivity, landslide, slip surface, Kebarongan
BERKALA FISIKA
2012-03-28
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2704
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika; 49-54
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2704/pdf
oai:ojs.ejournal.undip.ac.id:article/9669
2015-12-08T10:02:51Z
berkala_fisika:RA
STUDI APLIKASI EFEK FOTOKATALIS ZnO:Ag DIKOMBINASI OZON PADA PROSES PENCUCIAN CABAI
Sutanto, Heri
Arifin, Zaenal
Wibowo, Singgih
Hidayanto, Eko
Photocatalyst, ozone, chilies.
In this study, we have done evaluation of photocatalyst and ozone effect on chilies. The photocatalyst thin film was made by Ag doped zinc oxide (ZnO). The film was evaluated by X-ray diffractometer (XRD), Scanning Electron Microscopy (SEM) and UV-Vis for crystall stucture, morphology and optical band gap analysis. XRD result showed that the film has hexagonal wurtzite structure with crystallite size about 19.93 nm. From SEM result, morphology of film was not homogen and there were a lot of pores. From UV-Vis measurement, we could calculate the optical band gap of film about 3.081 eV. The chilies that used is hot peppers. They were washed by water from ZnO:Ag photocatalyst and ozone treatment. Time for water treatment was adjusted for 0, 15, 30 and 45 min. We have done monitoring on loss of mass of the chilies. The result showed that 15 min sample showed better result than other sample. In this sample, the chilies had smallest change of loss mass in 13 day observation. Keywords : Photocatalyst, ozone, chilies.
BERKALA FISIKA
2015-04-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9669
BERKALA FISIKA; 2015: Berkala Fisika Vol. 18 No. 2 Tahun 2015; 83-88
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9669/7745
oai:ojs.ejournal.undip.ac.id:article/3079
2012-04-07T12:31:48Z
berkala_fisika:RA
Interpretasi Data Seismik Refraksi Menggunakan Metode Reciprocal Hawkins dan Sofware SRIM (Studi Kasus Daerah Sioux Park, Rapid City, South Dakota, USA)
Wahyuningrum, Sri
Yulianto, Gatot
Nurwidyanto, M. Irham
Data processing of seismic refraction has been done. This data processing was the secondary data from seismic measurement result in the Sioux Park area, Rapid City, South Dakota, USA using EG refraction & G Geometrics Model ES-1210 seismic refraction instrument made in America with 12 geophones. The seismic refraction data processing was to determined the velocity and the deepness of eachs layer, and make geology under surface model then to interpreted the the data processing result using Reciprocal Hawkins method and SRIM software. On the seismic data processing used Reciprocal Hawkins method and SRIM (Seismic Refraction Inverse Modelling) software. Reciprocal Hawkins method used time depth concept and SRIM software used delay time concept. The time depth value or the delay time value was same with a half value of intercept time.The result from the data processing using Reciprocal Hawkins method was obtained threes layer, that are the seismic wave velocity of the first layer is 1013 ft/s, the second layer is 4007 ft/s and the third layer is 6887 ft/s. While the result of the deepness calculation obtained the deep of first layer range is 0,93 ft – 11,24 ft, the second layer ranging is 8,72 ft – 19,38 ft and from data processing the result using SRIM software obtained seismic wave velocity of the first layer is 970 ft/s, the second layer is 3485 ft/s and the third layer is 6150 ft/s, while the result of deepness calculation of the first layer range is 0,10 ft – 7,20 ft, the second layer range from 3,40 ft – 27,00 ft. From the under surface image model can be interpreted that the first layer is mouldy layer which represent cover layer, the second layer is clay stone layer, sand ( dry, having the pass character) and third layer is napal stone at Spearfish formation which has impermeable characteristic or waterproof. Key words: delay time, intercept time, Reciprocal Hawkins method, seismic refraction
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3079
BERKALA FISIKA; Vol 9, No 4 (2006): Berkala Fisika; 177-184
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3079/2760
oai:ojs.ejournal.undip.ac.id:article/2810
2012-03-29T12:05:10Z
berkala_fisika:RA
STUDI PEMANFAATAN ENERGI MATAHARI SEBAGAI PEMANAS AIR
Sidopekso, Satwiko
Using the principle of a box in a black body covered with glass crystal, Energy from the sun light which was emit thermal radiation energy of 1000 Watt/m2 at the day light under Standard Test Condition (STC), the head from the sun light will be speared in the box. Water from the storage tank will circulate without using a booster pump according to the principle thermoshipon to pass through the head collector pipes made of copper in a closed circulation and returned to the water storage tank. With water heating system is expected to have hot water with temperatures above 60o Celsius during the day. Key word : Solar Energy ; Head Collector; Thermoshipon.
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2810
BERKALA FISIKA; Vol 14, No 1 (2011): Berkala Fisika; 23-26
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2810/2496
oai:ojs.ejournal.undip.ac.id:article/23826
2019-06-25T13:45:58Z
berkala_fisika:RA
RANCANG BANGUN SISTEM KENDALI UNIT PENGOLAHAN AIR BERSIH BERBASIS ARDUINO UNO R3 DAN NEXTION
Supriyadi, Achmad
Setyawan, Agus
Suseno, Jatmiko Endro
Water treatment unit, nextion, arduino uno
The control of the ordinary water treatment unit on refinery location is still operated manually(by operator), especially in the filtering unit (IRF unit). There are 9 manual block valves that must be operated every 8 hours, to keep the water quality meets its specification. Manual operation can increase the risk of errors or delays in the operation or movement of service cycles and regeneration sequences. Subsequently, it can decrease the water quality and unefficiency in production. The automation of the water treatment unit was made using the nextion HMI touch screen circuit, Arduino Uno microcontroller, IC shift register, electronic relay and other electronic components. By connection between the Nextion HMI as an interface and the Arduino Uno microcontroller as electronic relay controller, the design of the control unit was able to control the clean water treatment unit simulator in accordance with the principles of the processing unit.Keywords: Water treatment unit, nextion, arduino uno
BERKALA FISIKA
2019-06-24
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/23826
BERKALA FISIKA; Vol 22, No 2 (2019): Berkala Fisika Vol. 22 No. 2 Tahun 2019; 42-55
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/23826/15375
Copyright (c) 2019 BERKALA FISIKA
oai:ojs.ejournal.undip.ac.id:article/3096
2012-04-07T12:38:45Z
berkala_fisika:RA
PENENTUAN KONSENTRASI AKTIVITAS URANIUM DARI INDUSTRI FOSFAT MENGGUNAKAN DETEKTOR ZnS(Ag)
Setiani, Indri
Munir, Mohammad
Firdausi, K. Sofjan
Bunawas, Bunawas
The activity concentration measurement of uranium (U238) in yellowcake sample which is coming from phosphate fertilizer industry P.T. PETRO KIMIA Gresik by using ZnS(Ag) detector has been done. In order to do this measurement, it is needed to callibrate and calculate the minimum detectable level of the detector. From the five samples that contain different yellowcake concentration, 400 mg of each samples were placed on five 2-inches-diameter stainless steel planchettes. HNO3 solution were added and the samples were shaken in order to make the samples as homogeneous as possible. The samples were totally evaporated under an infrared lamp until dry. Then they were counted by ZnS(Ag) detector. The uranium activity concentration measurement result of this method shows that sample with highest concentration of yellowcake (100%) have concentration activity 2,37 Bq/mg. While the sample with lowest concentration of yellowcake (37,5%) have concentration activity 0,95 Bq/mg. Key words : uranium, phosphate fertilizer industry, ZnS(Ag) detector, yellowcake
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3096
BERKALA FISIKA; Vol 9, No 2 (2006): Berkala Fisika; 63-70
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3096/2777
oai:ojs.ejournal.undip.ac.id:article/2886
2012-03-29T15:28:20Z
berkala_fisika:RA
Studi Efek Elektrooptis Pada Minyak Goreng
Widyastuti, Nina
Azam, Much
Firdausi, K. Sofjan
The aim of this research is to study differences between fresh palm oil and heated palm oil in the external static electric field. The external electric field used at this research was resulted from two parallel plates of 5 × 3 cm, separated by 2.5 cm and applied by high voltage from 0 to 11 kV. Light sources used here were red laser pointer (= 650 nm) and green laser pointer (= 532 nm) to measure change of polarization angle. The heated oil used here was fresh oil that was heated in circa 16 minutes. The results indicate that fresh oil has less average gradient of electro optic polarization (h) than heated oil, both of 650 nm and 532 nm. Theh’s value is measured more significant for = 532 nm than= 650 nm, and moreover can be used to measure the quality of oils based on fresh or polluted oil. Keywords: palm oil, electrooptic, polarization.
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2886
BERKALA FISIKA; Vol 12, No 2 (2009): Berkala Fisika; 63-68
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2886/2569
oai:ojs.ejournal.undip.ac.id:article/4975
2013-05-27T11:15:54Z
berkala_fisika:RA
STUDI UJI ALTERNATIF KUALITAS MINYAK GORENG BERDASARKAN PERUBAHAN POLARISASI CAHAYA TERIMBAS
Susan, Ade Ika
Firdausi, K Sofjan
Setiabudi, Wahyu
AbstractIn this research, we report the quality of several cooking oils before and after heating. The parameter of quality was based on electrooptics characteristic or, so called, the change ofpolarization angle induced by external electric field. In this examination, it was used threedifferent brands of cooking oils. The samples were heated in the time interval between 0-120minutes. The electrooptics characteristic was determined by measuring the change ofpolarization angle of light as it passed through the oil while it was applied by external electricfield. The field was produced by two parallel plates connected to different potential between 0-9kV. The light source was diode laser atλ = 650 nm and λ = 532 nm. The quality of oil was then determined by average polarization angle per potential difference, i.e. α ≡ Δθ/ΔV. Based on the result of observation, the fresh oil before heated has smaller change of polarization angle thanoil after heated, which is in agreement to the previous study. The longer heating time is, morefree radicals are produced, which leads to higher polarization. It shows also that the change ofpolarization depends on the wavelength. From two diode lasers, the effective wavelength toproduce higher number free radicals is obtained by 532 nm. The increasing average ofpolarization angle is linearly to the increasing of heating time. It is obvious that the electroopticsparameter could be proposed as an alternative quality test of cooking oil.Keyword: Cooking oil quality, Change of polarization angle, electrooptics
BERKALA FISIKA
2011-10-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4975
BERKALA FISIKA; Vol 14, No 4 (2011): Berkala Fisika; 135-138
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4975/4508
oai:ojs.ejournal.undip.ac.id:article/2933
2012-03-30T15:02:59Z
berkala_fisika:RA
Rancang Bangun Sensor Pergeseran Tanah Digital
Suryono, Suryono
The Research has been produced digital displacement field sensor system. This system can be applied on displacement level monitoring of building, bridge, dike and so forth. This developed system work serial digitally so that It can be connected to computer for many purpose. The field Displacement sensor use sliding potentiometer and a 10 bit Analog to Digital Converter (ADC) at microcontroller. The value of field displacement is sent digitally as multi byte serial data through UART serial communication protocol. The acquired data read to computer through COM1 with Borland Delphi 7.0 program. The research A system which can measure field displacement has been acquired from this research. The system has 1 mm resolution specification with the range of measurement up to 57 meters. From the sensor’s output has been acquired the output of the system with has the equation y = 0,990x + 0,154 with the linear correlation 0,998. Keyword : Displacement, digital, serial
BERKALA FISIKA
2012-03-30
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2933
BERKALA FISIKA; Vol 11, No 4 (2008): Berkala Fisika; 147-152
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2933/2621
oai:ojs.ejournal.undip.ac.id:article/4993
2013-05-27T16:00:23Z
berkala_fisika:RA
STUDI AWAL DAMPAK PERUBAHAN IKLIM BERBASIS ANALISIS VARIABILITAS CO2 DAN CURAH HUJAN (Studi Kasus; Semarang Jawa Tengah)
Gernowo, Rahmat
Adi, Kusworo
Arifin, Zaenal
Impacts of climate change marked by the increasing emissions of CO2 in the air and increased precipitation make various parties began to feel the need to measure the gas content on a regular basis.These gases gradually accumulating in Earth's atmospheric layers. However, the desire was constrainedby a number of issues which then affect the accuracy of the continuous mapping circulating gas in theatmosphere. Researchers speculate that the amount of CO2 and other gases is growing each day due tothe many additional human-produced carbon emissions from burning fossil fuels. The results obtained bythe pattern of variability in Semarang rising CO2 and rising precipitation trends show an indication ofclimate change has occurred. It was proven occurrence of climate anomalies and the previous year.Keywords: CO2 variability, Rainfall Semarang
BERKALA FISIKA
2012-10-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4993
BERKALA FISIKA; Vol 15, No 4 (2012): Berkala Fisika; 101-104
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4993/4526
oai:ojs.ejournal.undip.ac.id:article/2982
2012-04-03T15:26:15Z
berkala_fisika:RA
Studi Pengaruh Medan Radio Frekuensi (RF) pada Minyak Goreng
Firdausi, K. Sofjan
Istianah, Istianah
Marhaendrajaya, Indras
A study of non linier optic has been carried out for palm oil induced by RF frequency field,e using white light and laser light. The e’s value is produced by RF generator with 2kV of voltage and in the range of frequency between 6.04 MHz and 11 MHz. In this research, he-ne laser with 632.8 nm of wavelength, green pointer laser with 532 nm of wavelength and white light of halogen with maximum power 130, are used as source of light. The physical characteristics observed in the experiment are change of light polarization that is transmitted through palm oil. From experiment result indicates that the change of polarization angle is not linearly dependent on e, At the same condition, the highest changes of polarization angle takes place when providing green laser, upright position of RF frequency field on polarization angle direction 900 for the twice used-palm oil. Keywords: non – linier optics, polarization angle, RF frequency field
BERKALA FISIKA
2012-04-03
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2982
BERKALA FISIKA; Vol 11, No 1 (2008): Berkala Fisika; 1-4
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2982/2666
oai:ojs.ejournal.undip.ac.id:article/3001
2012-04-04T07:37:07Z
berkala_fisika:RA
Optimasi Prototipe Turbin Angin Menggunakan Metode Conjugate Gradient
Bilalodin, Bilalodin
Sugito, Sugito
One of the principal issue of energy conversion from wind energy to electrical energy is the optimization of its conversion process. Energy conversion is called optimum if the power lost is minimum. The condition can be attained at the development stage of a wind turbine prototype. This research will determine the optimum value the variables of various operation condition by using multivariables Conjugate Gradient (CG) optimization algorithm. It is found that the optimum value is attained at H = 1,0 m and D = 0,6 m, hence minimum power lost. The performance of turbine prototype design at laboratory, showed that the turbine can testing at low and high wind speed and the irrespective of wind direction condition. Keywords : optimalization, prototype, wind turbin, conjugate gradient
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3001
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus; B25-B30
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3001/2685
oai:ojs.ejournal.undip.ac.id:article/6177
2014-02-10T15:56:24Z
berkala_fisika:RA
RANCANG BANGUN ALAT UKUR KEKERUHAN AIR BERBASIS MIKROKONTROLER
Eka Nuzula, Nike
Endarko, Endarko
Turbidity meter based on microcontroller has succesfully been designed and fabricated. The photodiode as sensor and a LED as light source were used for measuring level of waterturbidity whereas microcontroller ATMega 8535 was used for data processing. The turbidity levelof water is measured based on Nephelometer method. The LED and photodiode detector were positioned parallel to each other at a distance of 2 inches. The measurement results indicated that the turbidity meter could be used to measure the turbidity level of water in the range 0 – 200 NTUand the maximum of standard deviation was at 1.33 NTU.Keywords : Turbidity, NTU, Photodiod, LED, Nephelometer
BERKALA FISIKA
2014-02-10
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/6177
BERKALA FISIKA; Vol 16, No 4 (2013): Berkala Fisika; 111-118
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/6177/pdf
oai:ojs.ejournal.undip.ac.id:article/3041
2012-04-07T12:47:11Z
berkala_fisika:RA
Koreksi Gaya Berat Akibat Curah Hujan Pada Pengukuran Gaya Berat Mikro Antar-Waktu Lapangan Panas Bumi Kamojang 2006-2007
Zaenudin, Ahmad
Shallow groundwater level changes cause seasonal gravity anomaly. Changes in groundwater level is directly related to rainfall, when heavy rainfall, groundwater level rises rapidly and then declined gradually. Gravity anomaly due to the season is important to take into account noise. Changes in groundwater level due to rainfall is calculated using empirical equations, and the Gravity response calculated using the approach of an infinite Bouguer slab correction by entering the porosity factor. The rainy season in the Kamojang geothermal field occur between November to June and dry season between July to October. The highest rainfall in 24 hours occurred on December 8 by 75 mm. From the empirical calculations showed that changes in groundwater level due to rainfall period November 2006-June 2006 amounted to -1.502 m and July 2007-June 2006 amounted to +0.396 m. Based on the approach slab Bouguer corrected gravity anomaly not to cause inter-time respectively -18.89 and +5.98 mikrogal mikrogal for porosity of 30%. Changes in groundwater level is negative (a reduction of groundwater) caused gravity anomaly time inter-negative, and vice versa. Correction of the gravity anomaly due to inter-time rainfall should not be ignored because of the gravity anomaly at the time inter-geothermal field is usually small. Key words: rainfall, groundwater level, inter-period gravity anomaly
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3041
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus; D25-D30
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3041/2723
oai:ojs.ejournal.undip.ac.id:article/7388
2014-09-24T09:09:09Z
berkala_fisika:RA
ANALISIS DISTRIBUSI TEMPERATUR PERMUKAAN TANAH WILAYAH POTENSI PANAS BUMI MENGGUNAKAN TEKNIK PENGINDERAAN JAUH DI GUNUNG LAMONGAN, TIRIS-PROBOLINGGO, JAWA TIMUR
Nur Faridah, Sri Ana
Krisbiantoro, Agus
Geothermal is a good alternative energy for this country. Are on track the ring of fire that able to make Indonesia has big and plenitude geothermal reserve. There are 11 regions in East Java that predict as geothermal prospect’s regions. Mount Lamongan’s region, Tiris- Probolinggo, East Java is the object of this research. The existence of geothermal in a region can identify with the surface manifestation, such as hot spring, fumaroles, geyser, hot mud, etc. Remote sensing technique can be use for identifying the indication of geothermal potency from the land surface temperature in the research region. Data analysis from Landsat 7 ETM+ path/row 118/65 (in 6 band thermal) in 2010-2013, it will describe of land surface temperature of geothermal prospect in study area. The result of land surface temperature showed that there is a heat distribution in the study area where the temperature ranges from 37oC up to 67oC, and it is alleged indication of geothermal. Therefore, it is interesting to study as the first step to explore geothermal safe and easy. Keywords: geothermal potency, land surface temperature, remote sensing, Landsat 7 ETM+ imagery, mount Lamongan.
BERKALA FISIKA
2014-04-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/7388
BERKALA FISIKA; 2014: Berkala Fisika Vol. 17 No. 2 Tahun 2014; 67-72
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/7388/6036
oai:ojs.ejournal.undip.ac.id:article/3058
2012-04-07T08:42:26Z
berkala_fisika:RA
Pembuatan Hologram Refleksi
Arifah, Arifah
Firdausi, K. Sofjan
Azam, M.
A Reflection hologram of a white ceramic object has been made on 5000 lines/mm PFG-03M holographic plate. A He-Ne Laser is used to record the holograms. And to reconstruct, it is used white, blue, and yellow light. The holographic plate for making of reflection hologram is PFG-03M. The optimal exposure time lies between 8 and 10 seconds. By reconstruction image white LED, it shows that the image is formed clearer than using blue and yellow light. Keywords: holography, reflection hologram, reconstruction, exposure time.
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3058
BERKALA FISIKA; Vol 10, No 3 (2007): Berkala Fisika; 127-135
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3058/2739
oai:ojs.ejournal.undip.ac.id:article/2455
2012-03-29T14:43:26Z
berkala_fisika:RA
Studi Sifat Termal Prekursor In(TMHD)3 Untuk Menumbuhkan Lapisan Tipis In2O3 dengan Teknik MOCVD
Saragih, Horasdia
Hasniah, Hasniah
Sustini, Euis
Sukirno, Sukirno
The In2O3 thin films have been deposited on quartz substrate by MOCVD technique using In(TMHD)3 as a metal organic precurcor. Thermal properties of In(TMHD)3 material have been investigated by analyses of TG-DTA curve and FTIR spectrum to determine the value of In2O3 deposition parameters. Based on TG-DTA curve and FTIR spectrum analyses, we find that: (1) melting point of In(TMHD)3 powder is 175oC; (2) In(TMHD)3 powder starts to evaporate at 184oC; (3) partial oxidation of In(TMHD)3 in Ar/atmosfer accur at 260oC; and (4) dissosiation of TMHD ligand from indium metal element happened in the temperature range 300oC – 400oC. According to these results, we maintaned growth condition for deposition of In2O3: the temperature of In(TMHD)3 bubbler (Tb) = 200oC; the pressure of In(TMHD)3 bubbler (Pb) = 260 Torr; the rate of argon gas flow to carried out the vapor of In(TMHD)3 = 50 sccm; the rate of oxygen gas = 50 sccm; and temperature of substrate = 300oC. In 120 minutes, the thickness of deposited In2O3 thin films, the rate of deposition, and the roughness of film surface are about 0.2 µm, 1.6x10-3 µm/menit and 70 nm, respectively. Keywords: In(TMHD)3 precursor, In2O3, thin films, thermal properties, MOCVD.
BERKALA FISIKA
2012-03-19
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2455
BERKALA FISIKA; Vol 13, No 1 (2010): Berkala Fisika; 19-26
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2455/pdf
oai:ojs.ejournal.undip.ac.id:article/9385
2015-11-05T11:03:32Z
berkala_fisika:RA
PENGARUH ADITIF BaCO3 PADA KRISTALINITAS DAN SUSEPTIBILITAS BARIUM FERIT DENGAN METODA METALURGI SERBUK ISOTROPIK
Nugraha, Priska R.
Widanarto, Wahyu
Cahyanto, Wahyu Tri
Kuncoro, Handoko S.
Barium hexaferrites, isotropic powder metallurgy, crystal characterizations, permanent magnets
Influences of concentration of BaCO3 on crystallinities and susceptibilities of barium ferrites using isotropic powder metallurgy method of fabrication is studied based on the characterization of X-Ray Diffraction (XRD), crystallite size distributions and hysteresis curve of Vibrating Sample Magnetometer (VSM). In this study, Fe2O3 of Cilacap iron sands are doped with BaCO3 with various concentrations of 15%, 30% and 45% at 1100 °C of sintering temperature. The results show that the addition of BaCO3 affects the formation of the multi-phase barium ferrite crystals and widen the crystallite size distribution, as well as lowering the saturations and the magnetic remanences. The optimum composition for barium ferrite magnets is obtained for 15% of BaCO3, with the highest mass susceptibility of 2.4 × 10-6 M3/Kg. Keywords: Barium hexaferrites, isotropic powder metallurgy, crystal characterizations, permanent magnets
BERKALA FISIKA
2015-01-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9385
BERKALA FISIKA; 2015: Berkala Fisika Vol. 18 No. 1 Tahun 2015; 43-50
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9385/7567
oai:ojs.ejournal.undip.ac.id:article/3074
2012-04-07T08:52:34Z
berkala_fisika:RA
Penentuan Kandungan Unsur Krom dalam Limbah Tekstil dengan Metode Analisis Pengaktifan Neutron
Khaerani, Nina
Azam, Much.
Firdausi, K. Sofjan
Soeleman, Soeleman
A determination of chromium which consisted in textile cesspool one of the company of textile residing in Ungaran using neutron activation analysis method.The sample has been threated in the form of sediment sample and liquid sample. The sample then an irradiated by Lazy Susan irradiation facility at Kartini reactor for six hours and then the counting is done by HPGe detector for 300 seconds. The qualitative results shown that samples contents Cr-51. The quantitatively sediment sample chromium element rate equal to 491. 67 ppm and liquid sample chromium element rate equal to 0.011 ppm Key words: Neutron Activation Analysis, irradiation.
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3074
BERKALA FISIKA; Vol 10, No 1 (2007): Berkala Fisika; 35-43
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3074/2755
oai:ojs.ejournal.undip.ac.id:article/2788
2012-03-29T12:52:59Z
berkala_fisika:RA
Studi Awal Pemodelan Perlakuan Virotherapy yang Menggunakan Virus Campak pada Tumor Paru-paru Tikus
Kartono, Agus
Sunjono, Sunjono
Arif, Ardian
The interaction model dynamics between tumor and viruses based on the interaction phenomenon between the three populations, namely: population of uninfected tumor cells, tumor cell population infected with the virus and the virus population. This study aimed to see the interaction between non-infected tumor cells, tumor cells infected with viruses and viruses, so it can be modeled using virotherapy treatment of measles virus in mouse lung tumors. Model parameters obtained from experimental data. Numerical Solution of the models suggest that the dose of the virus play an important role in determining the outcome of tumor therapy. Tumor growth can be slowed by using this virotherapy, but the tumor can not be killed as a whole. Keywords: model dynamics, virotherapy, measles virus, mouse lung tumors t; mu � ni�o� P� :IN'> viscosity, indeks of refraction, transparent liquid
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2788
BERKALA FISIKA; Vol 13, No 4 (2010): Berkala Fisika; 125-132
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2788/pdf
oai:ojs.ejournal.undip.ac.id:article/23478
2019-06-25T13:49:24Z
berkala_fisika:RA
RANCANG BANGUN SISTEM KENDALI IRON REMOVAL FILTER (IRF) PADA UNIT PENGOLAHAN AIR BERSIH BERBASIS PLC
Karyadi, Kukuh
Suseno, Jatmiko Endro
water treatment plant, Iron Removal Filter (IRF), PLC and HMI
Water is a necessity of life and is very important for everyone. The availability of clean water has been fulfilled in various ways. The Iron Removal Filter (IRF) control system is one processings and it is still used in the ordinary water treatment plant. However, it is still manually operated so that it need many the processings. The aim of this research is to develop the automatic IRF processing unit using the Programmable Logic Controller (PLC). The control system contained PLCs, relay circuits, power supplies and Human Machine Interfaces (HMIs) to control the clean water processing unit including controlling the IRF process automatically. The prototype of the water treatment plant consisted of an aerator unit, an IRF unit, a storage tank, several pumps, and some control valves were controlled by the operating control system. The control system could be easily operated and it has a very attractive appearance using HMI. Therefore, it is highly recommended to be used in the actual clean water treatment unit.Keywords: water treatment plant, Iron Removal Filter (IRF), PLC and HMI
BERKALA FISIKA
2019-05-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/23478
BERKALA FISIKA; Vol 22, No 1 (2019): Berkala Fisika Vol. 22 No. 1 Tahun 2019; 3-15
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/23478/15167
Copyright (c) 2019 BERKALA FISIKA
oai:ojs.ejournal.undip.ac.id:article/3091
2012-04-07T12:36:15Z
berkala_fisika:RA
Pemetaan Sebaran Air Tanah Asin Pada Aquifer Dalam di Wilayah Semarang Bawah
Nurwidyanto, M. Irham
Widodo, Sugeng
T. Achmad, Refyana
A research to mapping of saline groundwater spreading at deep aquifer in SEMARANG Awash area, exactly at 49 zone, coordinate X(422000-445000), Y(9222100-9232000) is carry out. Electrical conductivity used in this research as approximation to saline value of groundwater. Then, the isoconductivity contour map made based on that’s conductivity value using surfer 7 to see the mapping of saline groundwater spreading. After that, a hydrochemistry analyze method resemble to Trilinier Piper diagram and Chlorida-Carbonat Ratio (R) used to analyze caused factor of saline from groundwater. Base on the groundwater saline grade clasification from PAHIAA, Jakarta, the groundwater at deep aquifer of Semarang bawah area come in insipid that spread out almost in all Semarang bawah area and insipid-saltish groundwater clasification that just found in two area, are central Pedurungan (Tlogosari) and Tugu Muda direct to Pemuda street area. Base on Trilinier Piper diagram and Chlorida-Carbonat Ratio (R) analyze, the saline of groundwater at deep aquifer in Semarang Awash area is the effect from the sea water intrusio, except in central Semarang area the salted of groundwater it’s not caused by the sea water intrution, may be couse by dilution of salt mineral which imbedded in the groundwater..
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3091
BERKALA FISIKA; Vol 9, No 3 (2006): Berkala Fisika; 137-143
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3091/2772
oai:ojs.ejournal.undip.ac.id:article/2870
2012-03-29T14:25:06Z
berkala_fisika:RA
PENENTUAN STRUKTUR KRISTAL AlMg2 ALLOY DENGAN DIFRAKSI NEUTRON
Ismul Hadi, Arif
Sumariyah, Sumariyah
Dahlan, M.
Mohtar, Mohtar
The determination of crystallography structure of AlMg2 alloy has been done by neutron diffraction. In fabrication process, it was addressed by rolling phases. The first by hot rolling with thickness follows: 8.35 mm; 7.00 mm; 5.6 mm; 2.60 mm; 1.65 mm ± 0.05 at 425 0C temperature extended by cold rolling: 1.65 mm to 1.30 mm ± 0,07 thickness at normal temperature. Counting of the data was started by activate of detector from 110 to 400 angle with 0.075 overstep and preset monitor count of 60,000 at 26 MW. Processing of the data using of microcomputer 16 bit NEC PC-9801 VM2. The results show that the AlMg2 alloy structure are FCC system with lattice parameter (a) = 4.0817 A0. Keywords: AlMg2 alloy, neutron diffraction, and FCC
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2870
BERKALA FISIKA; Vol 14, No 2 (2011): Berkala Fisika; 41-48
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2870/2555
oai:ojs.ejournal.undip.ac.id:article/3107
2012-04-07T12:42:35Z
berkala_fisika:RA
Disain Peredam Suara Berbahan Dasar Sabut Kelapa dan Pengukuran Koefisien Penyerapan Bunyinya
Khuriati, Ainie
Komaruddin, Eko
Nur, Muhammad
research aims to determine sound absorption of absorber materials making from coconut coir composites. Absorber material have been made with different composition from coconut coir composites. Twelve samples have been made. One of samples is natural coconut coir and the other are made from coco fiber and coco peat with certain compositions. From 12 samples, 10 samples have been tested. Absorption coefficients was measured by impedance tube method with ASTM E-1050:1990 standardization. The experiment results show that coconut coir is up to standard for absorber material according to ISO 11654 , that is with weigthed absorption (aw) over 0,15. Weigthed absorption of samples are, A:0,30; B:0,44;C:0,27;D:0,44; E:0,51; F:0,44; G :0,47; H:0,49; I:0,31;J:0,41. So samples A,B,D,E,F,G,H,I and J can be classified in class-D while sample C in class-E. Absorber materials that have been made are also compatible with marketed products. The best composition for absorber was mixture of coco dust and coco fiber. Improving amount of coco fiber improve maximum absorption. Adding air cavity between samples and wall improve absorption. Improving mass density of sample making with similar total mass of composition and similar glue improve absorption in low frequency. Keyword: coconut coir, coco fiber, coco peat, sound absorber, impedance tube, absorption coefficient, pore.
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3107
BERKALA FISIKA; Vol 9, No 1 (2006): Berkala Fisika; 43-53
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3107/2788
oai:ojs.ejournal.undip.ac.id:article/2928
2012-03-30T14:29:52Z
berkala_fisika:RA
KAJIAN PENGARUH WARNA DAN JARAK LAMPU PENGAMAN TERHADAP HASIL RADIOGRAF
Setiyono, Setiyono
Azam, M.
Setiawati, Evi
The study of influence of distance, time and color for safety lamp filter variation to radiograph has been done. The research used blue sensitive film and green sensitive, type -X ray, film. The research was conducted by illuminating film with safety lamp red, yellow, green and blue color filter. The type of filter was red acrylic riddle and glass which was layered in red, yellow, green and blue scot light. The variation of irradiating distance between safety lamp with film was 20 cm, 30 cm, 40 cm, 50 cm, 60 cm, 70 cm, 80 cm, 90 cm, 100 cm and variation of time is 10 second, 15 second, 20 second, 25 second, 30 second, 35 second, 40 second, 45 second, 50 second, 55 second, and 60 second. Respectualy measurement of irradiating resulted used measuring densitometer instrument. The result of research give an illustration that variation of distance, variation of time and color of safety lamp filter influence the radiograph. The greater distance caused the fog result becomes smaller. The longer time caused the fog result becomes bigger. To red acrylic filter, the fog that resulted exceed the tolerance limit is more than 0,2, but for glass filter that layered red scot light is not more than tolerance limit. Keyword: Radiograph, Blue sensitive film, Green sensitive film, Fog, Scot light.
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2928
BERKALA FISIKA; Vol 12, No 1 (2009): Berkala Fisika; 1-5
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2928/2616
oai:ojs.ejournal.undip.ac.id:article/4987
2013-05-27T16:02:40Z
berkala_fisika:RA
PENENTUAN CT DOSE INDEX (CTDI) UNTUK VARIASI SLICE THICKNESS DENGAN PROGRAM DOSXYZNRC
Andriani, Intan
Anam, Choirul
Setiawati, Evi
The calculation of CT dose and CTDI has been done by using DOSXYZnrc software. Two kinds of phantoms have been used, i.e air and PMMA phantoms. The volume of phantoms 16 x 16x 16 cm3. The simulation carried out at 120 kV and the particles source 106. The calculation ofdose at the mid of phantom at the z axis, every voxel 0,2 x 0,2 x 0.2 mm3. The variation of slicethickness were 5 mm, 10 mm, 15 mm and 20 mm. The dosages at every point then were plotted tofind out dose profile, and then were integrated to find out the CTDI. It was obtained that the peakvalue on the air phantom has a higher value than the PMMA phantom. In the air phantom at theslice thickness of 5 mm, 10 mm, 15 mm and 20 mm were 68.28%, 80.49%, 90.91%, 99.86%. Whilein PMMA were 63.68%, 77.42%, 89.32%, 100%. At the penumbral region, it was obtained thatdosage at the PMAA phantom has a higher than the air phantom. CTDI from the PMAA phantomwas 212.50% and the air phantom was 184%. It was obtained that CTDI independent of slicethickness at the range 5-20 cm.Keywords: DOSXYZnrc, Slice thickness, CTDI
BERKALA FISIKA
2012-07-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4987
BERKALA FISIKA; Vol 15, No 3 (2012): Berkala Fisika; 69-76
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4987/4520
oai:ojs.ejournal.undip.ac.id:article/2977
2012-04-03T12:34:51Z
berkala_fisika:RA
Review Studi Difraksi Fresnel Menggunakan Celah Bentuk Lingkaran
Rosyidah, Arinar
Marhaendrajaya, Indras
Firduasi, K. Sofjan
The Fresnel Diffraction has been reviewed to measure the wavelenght of monochromatic light sources. The change of circle fringe’s number is obtained by the change of the distance between source and slits, and the change of fringe’s radius. We used here the diode green pointer laser and red pointer laser as light sources with 1 mW in power. From the measurement, we obtained that the wavelenght of green laser and red pointer laser are still in the range of literature values. Key words: Fresnel diffraction, Fresnel zone.
BERKALA FISIKA
2012-04-03
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2977
BERKALA FISIKA; Vol 11, No 2 (2008): Berkala Fisika; 39-43
1410-9662
en
oai:ojs.ejournal.undip.ac.id:article/5006
2013-05-27T16:22:11Z
berkala_fisika:RA
MASSA KLASIK SOLITON PERSAMAAN SCHRÖDINGER NONLINEAR
Prayitno, T. B.
We have calculated classical mass of soliton of nonlinear Schrödinger equation in thecase of (1+1) space-time dimension. The equation describes the propagation of electromagneticwave in combination of dispersive-nonlinear medium. The propagation itself will create a stableelectromagnetic pulse. The first thing that must be done is to calculate analytical solution of onesoliton of nonlinear Schrödinger equation by transforming wave function and continuing byapplying direct integration. The definition of its classical mass is based on classical field theory bybeginning the construction of Lagrangian density and continuing Hamiltonian density of thatnonlinear equation. The Lagrangian density is obtained by trial function relating by Euler Lagrange that creates appropriate nonlinear Schrödinger equation.Keywords:Soliton,Nonlinear Schrödinger.
BERKALA FISIKA
2011-07-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5006
BERKALA FISIKA; Vol 14, No 3 (2011): Berkala Fisika; 75-80
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5006/4539
oai:ojs.ejournal.undip.ac.id:article/5260
2013-08-01T09:45:13Z
berkala_fisika:RA
PEMBUATAN ELEKTRODA DAN PERANCANGAN SISTEM CAPACITIVE DEIONIZATION UNTUK MENGURANGI KADAR GARAM PADA LARUTAN SODIUM CLORIDA (NaCl)
Himmaty, Ikfina
Endarko, Endarko
Fabrication of electrode and design of capacitive deionization (CDI) have been successfully carried out. Electrodes have been made using an activated carbon from coconut shell, graphite andepoxy with ratio 82:10:8. Mixture of activated carbon and graphite poured on an epoxy solution, andthen it was added with hardener and epoxy resin (1:1). Electrodes with dimension of 8 × 6 × 0.3 cmhave been made with doctor blade method. Specific capacitance of the electrode measured at 7.8 mF/gwith porosity 13.4%. Desalination is done by passing a solution of NaCl 0.5 M with a flow rate 3.5 ml/min in the CDI system. Salt removal in the capacitive deionization can be measured withconductivity parameter of NaCl solution before and after the desalination process. Calculation ofpercentage reduction in NaCl concentration can be determined by the decrease in conductivity of thesolution after desalination. The results showed that the maximum percentage reduction of salt levels inthe NaCl 0.5 M solution for configurations of monopolar and bipolar were achieved at 10.4% and4.3%, respectively, within 5 minutes of testing time.Keywords: capasitive deionisation (CDI), desalination, activated carbon from coconut shell
BERKALA FISIKA
2013-07-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5260
BERKALA FISIKA; Vol 16, No 3 (2013): Berkala Fisika; 67-74
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5260/4745
oai:ojs.ejournal.undip.ac.id:article/3036
2012-04-06T07:42:56Z
berkala_fisika:RA
Penerapan Film Tipis Ba0.25Sr0.75TiO3 (BST) Yang Didadah Ferium Oksida Sebagai Sensor Suhu Berbantukan Mikrokontroler
Ardian, A.
Nady, L.
Erviansyah, R.
Syafutra, H.
Irzaman, Irzaman
Siswadi, Siswadi
Ferroelectric material originating from Barium Strontium Titanate (BST), is expected to have high energy because it has a dielectric constant and high charge storage capacity [6]. Materials produced by the process of ferium dopan, it is hoped will be a temperature sensor. If, materials BST and BFST (Barium Ferium Strontium Titanate) subjected to the temperature (material change that temperature), and the resulting voltage, then this material can be applied as a temperature sensor using a microcontroller. Microcontroller that used is ATMega 8535 with internal ADC. Voltage was generated, will be reinforced with a voltage amplifier (OpAmp) and will be processed into digital data at the ATMega8535 internal ADC (Analog Digital Converter).Incoming digital data will be processed and displayed in the view Microcontroller-based desktop applications Delphi 7. The material to be tested is material BST, BFST 5%, and BFST 15%. Keyword: BST, Temperature sensor, ATMEGA 8535, ADC, Delphi 7
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3036
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus; C53-C64
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3036/2718
oai:ojs.ejournal.undip.ac.id:article/7384
2014-09-24T09:08:04Z
berkala_fisika:RA
PENENTUAN QUALITY CONTROL (QC) RESOLUSI SPASIAL PADA CITRA CT SCAN DENGAN METODE LINE SPREAD FUNCTION (LSF) DAN POINT SPREAD FUNCTION (PSF) MENGGUNAKAN PHANTOM AAPM CT PERFORMANCE
Yusanti, Weirna
Budi, Wahyu Setia
Adi, Kusworo
Computed Tomography (CT scan) is one of the X-ray modalities used in radiodiagnostic, as result it needs to do Quality Control (QC). This study focused on the image quality test of CT Scan by considering the spatial resolution parameters and using calculation method of the digital image. The effect of exposure factors (voltage and electric current) was also on image quality. This study using multislice CT (MSCT) 128 slice and AAPM CT Performance Phantom. Phantom scanned with the variation of exposure factors (80, 100, 120 kV and 50, 100, 150, 200, 250, 300, 350, 400, 450, 500 mA). The determination of spatial resolution value derived from the value of Full Width at Half Maximum (FWHM) of the Line Spread Function (LSF) and Point Spread Function (PSF) graphics. Results shown that the higher voltage applied, the smaller value of FWHM which show better image quality. This method is able to detect spatial resolution up to the 5th level (hole diameter 0.75 mm), whereas it is only up to 3rd level (1.25 mm) visually. The image quality in this study has been compared with the rules of West Austr Compliance Testing Protocol 2006, and it is proved that the image quality is still good, thus the CT Scanner is still feasible to use. Key words: CT Scan, Spatial Resolution, Line Spread Function, Point Spread Function
BERKALA FISIKA
2014-09-24
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/7384
BERKALA FISIKA; 2014: Berkala Fisika Vol. 17 No. 2 Tahun 2014; 39-44
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/7384/6032
oai:ojs.ejournal.undip.ac.id:article/3053
2012-04-07T08:40:02Z
berkala_fisika:RA
Rancang Bangun Prototipe Alat Pres Tahu Otomatis Berbasis Mikrokontroler
Sumariyah, Sumariyah
An automatic tahu pressing device prototype that controlled by AT89C51 has been made. The tahu pressing is completed by the cast with 15 cm length, 10 cm width and 2,5 cm high. A microcontroller controlled stepper motors move used to make the desiserd shifting of the pressing thickness. One was used to move a conveyor deliver the tahu to be pressed and another to press the tahu itself. The pressing was done by setting the DL value to yield strain. Stepper motors’ step angle was reduced using a gear combination which results in a 0,270 per step. Each stepper motor yields 0,005 mm shifting of the rotating mechanics The prototype of an automatic tahu pressing device that controlled by microcontroller AT89C has done properly, that is automatically pressing tahu according desired thickness.
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3053
BERKALA FISIKA; Vol 10, No 4 (2007): Berkala Fisika; 193-200
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3053/2734
oai:ojs.ejournal.undip.ac.id:article/9298
2015-10-19T16:18:29Z
berkala_fisika:RA
PERUBAHAN FUNGSI GELOMBANG ELEKTRON PADA MULTIPLE SCATTERING UNTUK SUDUT HAMBUR NOL
Guswantoro, Taat
Nur, Muhammad
Gunawan, Vincencius
Multiple scattering in the plasma present doe to movement of charged particle influenced by Coulomb interaction between charged particles in the plasma. Research on multiple scattering among influences of effective field on the multiple scattering, lost energy due to scattering processes, the aims of this study are to determine the scattered wave function, multiple scattering cross-sections and scattered electron energy. The understanding of the electron scattering in the plasma in this study using the optical approximation that is application of wave properties of electron. The calculation of scattered wave function is using first Born approximation, by taking the scattering potential energy is the summary of potential energy of electron by interaction with each ions that present in the plasma sphere. Electron wave function after scattered is changes, though the direction is same with the direction of initial electron coming, presence a reduction in amplitude as a function of the distance the wave trajectory. Keywords: Multiple Scattering, Plasma, Born approximation.
BERKALA FISIKA
2014-10-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9298
BERKALA FISIKA; 2014: Berkala Fisika Vol. 17 No. 4 Tahun 2014; 145-150
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9298/7510
oai:ojs.ejournal.undip.ac.id:article/3069
2012-04-07T08:00:41Z
berkala_fisika:RA
Analisis Geometri Akuifer Dangkal Mengunakan Metode Seismik Bias Reciprocal Hawkins (Studi Kasus Endapan Alluvial Daerah Sioux Park, Rapid Creek, South Dakota, United State of America)
Listiyani, Fenti
Yulianto, Gatot
Data processing of refraction Seismic with reciprocal Hawkins method have been done by using the secondary data in area of Sioux Park, Rapid Creek, South Dakota, United State of America which has geology structure of alluvial sediment. The sediment Alluvial has the form of water carrier rock precipitated by Rapid Creek. The result of this research are: first layer with velocity vary from 268 m/s to 347 m/s consist of clay functioning as covering layer, the second layer have velocities 939 m/s-1829 m/s, depth 0.28 m-3.43 m and thickness 0.26 m-4.40 m, lapped over from clay, sand, and gravel functioning as carrier coat irrigate or coated acquifer and the third layer, have velocity 1874 m/s-2216 m/s lapped over from stone napal, acts as waterproof coat (impermeable). These acquifers are unconfined aquifer. Keywords: acquifer, seismic refraction, ground water
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3069
BERKALA FISIKA; Vol 10, No 1 (2007): Berkala Fisika; 1-5
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3069/2750
oai:ojs.ejournal.undip.ac.id:article/2712
2012-03-29T14:39:03Z
berkala_fisika:RA
Pemodelan Struktur Pori Dari Batuan Geologi Dengan Fractal
Ferani, S
Has done modeling with fractal pore structure and fracture of geology rock. Sun and Koch (1998)[2] states that the geological formations of porous rock has a fractal nature ..Modeling the generated fractal porous media have been carried out, which generated fractal modeling has the potential high enough to be able to model the porous media, although the modeling parameters require optimization in order to generate fractal porous media a valid model with actual data. The studied rock samples taken from surface rock formations Parigi Cirebon, West Java. Fractal model is then validated by optimizing the parameters that appear in the modeling for valid with the data of rock that can be estimated by image analysis. Key words: fractal, models, rock geology
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2712
BERKALA FISIKA; Vol 13, No 3 (2010): Berkala Fisika; 91-96
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2712/pdf
oai:ojs.ejournal.undip.ac.id:article/12805
2016-12-16T09:52:53Z
berkala_fisika:RA
PENINGKATAN SIFAT MAGNETIK MATERIAL HEMATIT MELALUI SUBTITUSI BARIUM DAN KONTROL TEMPERATUR SINTERING
Widanarto, Wahyu
Fauzi, Fuzi Nurrahman
Cahyanto, Wahyu Tri
Effendi, Mukhtar
Iron sand, barium ferrite, structure, magnetic properties
Ferrite magnet or ceramic magnet is a competitive product in the magnet market due to low price, corrosion resistant and chemically stable. Barium hexa-ferrite magnet is one of ferrite magnet which is mostly used as magnetic storage and electronic devices based on nanotechnology. Barium hexa- ferrites are synthetized through solid state reaction method at sintering temperatures of 1100 °C with the composition (100-x)Fe2O3 : xBaCO3 , where x = 0 and 20 in mol % . Results of XRD characterization show that the diffraction peaks of XRD spectrum is dominated by the peaks of barium ferrite crystal with a hexagonal crystal system. Magnetic properties of Fe2O3 material doped with barium carbonate of 20 mol % and sintered at 1100 °C increase significantly compared to the others. This simple and inexpensive method is very promising for the manufacture of barium hexa-ferrite materials with natural ferrite as the main material.Keywords: Iron sand, barium ferrite, structure, magnetic properties
BERKALA FISIKA
2015-10-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/12805
BERKALA FISIKA; 2015: Berkala Fisika Vol. 18 No. 4 Tahun 2015; 125-130
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/12805/9597
Copyright (c) 2016 BERKALA FISIKA
oai:ojs.ejournal.undip.ac.id:article/3085
2012-04-07T12:34:16Z
berkala_fisika:RA
Perhitungan Kecepatan Terminal Obyek Jatuh di Udara
Edi Widodo, Catur
A program for determined terminal velocity of falling object in the air have been done with Python programming language version 4.2. Program was simulated interaction between massive object spheris with fluid gas (air). Program was construct by mean finite difference equation in object oriented programming Python. Object simulation is falling massive object spheris in static fluide. Input parameter is mass and radius object and viscosity of fluid. Output is direction and velocity of object. The result of simulation indicated the terminal velosity is depend on mass and radius of object and viscosity of fluid.
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3085
BERKALA FISIKA; Vol 9, No 4 (2006): Berkala Fisika; 221-224
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3085/2766
oai:ojs.ejournal.undip.ac.id:article/2799
2012-03-29T12:03:46Z
berkala_fisika:RA
RANCANG BANGUN PENGENDALI MOTOR STEPPER UNTUK DETEKSI JUMLAH OBYEK PUTAR DENGAN MENGGUNAKAN KOMPUTER
Sumariyah, Sumariyah
Sudarmanto, Agus
Gunadi, Isnain
It has been designed a mechanical equipment what could moving rotate each 45° and moving up and down betake to sensor hole, that be drive by two stepper motors. The operation of both stepper motors use Turbo Pascal language programming 5.5 version. The mechanical equipment could be operated in a automatically that is for moved the object rotate each 45° then the object betake down aim sensor hole and execute detection the object so after detected then the object move ascend aim first position. Result of using this mechanical equipment was have appearing result from detection object be automatically that is amounting to eight objects. Keyword : PC, stepper motors, object rotate.
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2799
BERKALA FISIKA; Vol 14, No 1 (2011): Berkala Fisika; 17-22
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2799/pdf
oai:ojs.ejournal.undip.ac.id:article/23829
2019-06-24T17:05:30Z
berkala_fisika:RA
oai:ojs.ejournal.undip.ac.id:article/3102
2012-04-07T12:40:55Z
berkala_fisika:RA
Rekayasa Bahan untuk Meningkatkan Daya Serap Terhadap Gelombang Elektromagnetik dengan Matode Deposisi Menggunakan Lucutan Korona
Gunawan S.K., Vincensius
The aim of this research is to engineer soft steel which have low value absorbance of electromagnetic waves become a material which have higher value absorbance. The method used is deposition by corona discharge. Corona discharge generated in free space will ionisize air producing nitrogen ion that can be deposite in basic material. This process will increase the density in the surface of basic materials and then will make the value of linear absorbance constant of basic material become higher. The optimal result in this research is the raise of the value of linear absorbance constant by 54,3 % with the time of deposition in 30 minutes, the voltage of electrode 5 kV and distance between electrodes 6 mm.
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3102
BERKALA FISIKA; Vol 9, No 1 (2006): Berkala Fisika; 5-14
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3102/2783
oai:ojs.ejournal.undip.ac.id:article/2921
2012-03-30T14:32:17Z
berkala_fisika:RA
Kajian Teoritis Penentuan Tetapan Planck Menggunakan Model Elektrodinamika Maxwell
Zaada Faidullah, Ilmy
Sasongko, Dwi P.
Priyono, Priyono
Theory of Electromagnetism and Planck constant have important role in the development of light theory. Electromagnetism theory explains the velocity of light is constant and finite because light is phenomenon of propagation of Electromagnetism Wave. Distribution of Planck Radiation that introduces Planck constant also based on the theory of Electromagnetism, however, now light treated like as a particle. Planck constant not only radically changes concept of light but also has be main source of the birth of Modern Physics. An interesting thing to investigate connection between Maxwell equation that well known with concept of classically Physics and Planck constant, a constant that often used in Quantum Mechanics. Deriving Planck constant from Maxwell Equation can be done by understanding study of Radiation Quantization that based on the assumption. First, Electromagnetism wave is on the vacuum space so there is no charge and current. Second, Hamiltonian of Radiation stated by Hamiltonian of Harmonic Oscillation. Third, mass of Photon regarded does not affect Hamiltonian of Radiation because it is difficult to determine rest mass of Photon. Fourth, Dirac postulate used as non commutable multiplication rule of position and momentum coordinate. In this research has obtained an elaborate explanation deriving Planck constant from Maxwell equation that can be shorted as follow. From Maxwell equation will be derived Maxwell wave equation that consist of Vector Potential Fields. Its form similar with Harmonic Oscillation function so Hamiltonian Radiation can be stated as Hamiltonian of Harmonic Oscillation. By Using Dirac postulate, Oscillation Harmonics can be studied in Quantum Mechanic so will be obtained Planck constant that contained on the Fourier Coefficient Operator. Keywords : Maxwell Equation, Planck Constant, Fourier Coefficient Operator.
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2921
BERKALA FISIKA; Vol 12, No 4 (2009): Berkala Fisika; 131-136
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2921/2609
oai:ojs.ejournal.undip.ac.id:article/4981
2013-05-27T14:18:11Z
berkala_fisika:RA
Sintesis Nanopartikel Cerium Oxide Menggunakan Metode Presipitasi dan Sifat Optiknya
Nurhasanah, Iis
Sutanto, Heri
Muhlisin, Zaenul
Nurdianik, Sulistia
Nursanti, Ida
Cerium oxide nanoparticles have been synthesized using precipitation method in mixed-solvent system of aquades DM and isopropanol with volume rasio of 1:6. Presipitation wascarried out by dropping amonium hidroxide to cerium nitrate hexahydrate solution until pH of 9. Precipitated was dried at temperature of 60oC for 2 hours and then calcined for 2 hours attemperatur of 200oC, 300o and 400oC. Optical properties of cerium oxide nanoparticles werecharacterized using UV-Vis spectrophotometer. Cerium oxide nanoparticles exhibit goodtransparency in visible region and strong UV absorbance. These reults suggesting that ceriumoxide nanoparticles are potential as bionanomaterial for application in UV-blocker.Keywords: cerium oxide, nanoparticles, precipitation, UV filter, band gap energy, UV-Visspectrophotometer
BERKALA FISIKA
2012-04-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4981
BERKALA FISIKA; Vol 15, No 2 (2012): Berkala Fisika; 41-48
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4981/4514
oai:ojs.ejournal.undip.ac.id:article/2973
2012-04-03T11:48:47Z
berkala_fisika:RA
Pengaruh Kenaikan Suhu Cairan Developer Terhadap Densitas Radiograf
Septiadi, Jujun
Anam, Choirul
Azam, Much
This aim of the research is to obtain an optimal developer temperature. The increase of dilution temperature of developer to radiograph density has been measured. The Research is conducted with measuring radiograph density with a certain exposure factor and materials and varies temperature among 170 C – 320 C. The result indicates that the higher of temperature is the greater of its density value. The optimal temperature obtained at spanning temperature among 200 C – 230 C. Key words: The dilution temperature of developer, density of radiograph, optimal temperature
BERKALA FISIKA
2012-03-30
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2973
BERKALA FISIKA; Vol 11, No 3 (2008): Berkala Fisika; 75-77
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2973/2658
oai:ojs.ejournal.undip.ac.id:article/5000
2013-05-27T15:52:56Z
berkala_fisika:RA
KOMPUTERISASI TABEL SIFAT-SIFAT TERMODINAMIK DARI H2O, R-12, DAN R-22 (PROTAMIK)
Khuriati RS, Ainie
Detika, Detika
Bawono P, Ari
A computer program has been created which is used to display the thermodynamic properties (T, p, v, u, h, and s) of the working fluid of the commonly used on the power generation and processindustries, H2O, R-12, and R-22. It also calculates the thermodynamic properties as function of saturationtemperature and quality and saturation pressure and quality. Program was developed using the thermodynamic properties of steam properties from 1967 ASME Steam Table [1] andASHRAE tables [5].Keywords: thermodynamics, properties, steam tables, refrigerant tables, quality.
BERKALA FISIKA
2013-01-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5000
BERKALA FISIKA; Vol 16, No 1 (2013): Berkala Fisika; 5-8
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5000/4533
oai:ojs.ejournal.undip.ac.id:article/2996
2012-04-04T07:33:57Z
berkala_fisika:RA
Konsep Massa Ekonomis Sebagai Ukuran Kelembaman Pelaku Ekonomi Dalam Ruang Harga (Kajian Mekanika Kuantum Dalam Ekonomi Mikro)
Rifai, Bachtiar
Palupi, Dwi Satya
Rosyid, Muhammad Farchani
This paper has studied the correlation of economic systems in the market for goods by using the concept of state and the concept of observable in quantum mechanics.Also proposed the concept of economical mass as an economic actor counterparts concept of inertia or inertia in physics. Studied the things that determine the mass of a principal economic economical. Discussed the possibility of applying the model to market goods with commodities and M N economic actors using the concept of Quantum Many Body Problem. Keywords: Ekonofisika, Applied Physics, Massa economical, Quantum many-body problem
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2996
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus; A7-A12
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2996/2680
oai:ojs.ejournal.undip.ac.id:article/5213
2013-07-30T08:52:54Z
berkala_fisika:RA
PENGARUH JARAK PADA KUALITAS CITRA HASIL REKONSTRUKSI MODE FAN BEAM DENGAN GEOMETRI DETEKTOR BERUPA GARIS
Anam, Choirul
Widodo, Catur Edi
Image recontruction for fan beam mode with line geometry of detectors have been done. Theobject being imaged is the Shepp-Logan phantom with matrix size 50x50. Projections were made forangle 00 to 3600 with angle interval 10. The distance between the rays in the midle of the object (s) isequivalent to 1 pixel. The distance of source to central of object (D) were varied 40,50, 60, 70, 80, 90,100, 110 pixels. Reconstruction of image was carried out by the method of filtered back projection(FBP) with Lek-Ram filter. It is obtained that if the distance of X-ray source and center of the object,smaller than 3/4 diagonal object, the image will be distorted, and if the distance is greater than 6/7diagonal object, the image will be clipped.Keywords: Image reconstruction, fan beam, line geometry of detector
BERKALA FISIKA
2013-04-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5213
BERKALA FISIKA; Vol 16, No 2 (2013): Berkala Fisika; 41-46
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5213/4713
oai:ojs.ejournal.undip.ac.id:article/3030
2012-04-05T15:02:17Z
berkala_fisika:RA
Prototipe Pemanas Air Tenaga Surya Menggunakan Karbon Sebagai Penampung Kalor
Wihantoro, Wihantoro
Yanto, Agus
Sunardi, Sunardi
A solar water heater prototype that fully exploit the nature of black body radiation are made from carbon powder mixed with cement as a thermal energy container material has been created. The phenomenon of physics that underlie the pattern of spread of heat and decrease their physical equations studied in this paper.Construction of heating a metal box containing the installation of planar spiral-shaped copper pipe which is covered with mortar-carbon. The water that fills the copper pipes are supplied by thermal energy from carbon-mortar. Immediately after absorbing heat energy, water density to be different in each section of pipe, causing water circulation by convection between the heater with a water reservoir. The performance of prototype heater is seen from measurements of water temperature rise in the reservoir every 15 minutes. The results are used to determine the average temperature rise of water in every second of it at once to calculate heat energy absorbed by the water in each second. Water temperature in the reservoir increased by 0.0009 ° C per second. At the maximum irradiation conditions, the rate of heat per second that are transferred from a mixture of carbon into the water-cement amounted to 0.075 kW. Keywords: heat energy, water circulation by convection, heat rate per second
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3030
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus; C21-C26
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3030/2713
oai:ojs.ejournal.undip.ac.id:article/6575
2014-03-21T15:22:15Z
berkala_fisika:RA
Studi Analisis Echo Train Length dalam K-Space Serta Pengaruhnya Terhadap Kualitas Citra Pembobotan T2 FSE pada MRI 1.5 T
Simanjuntak, Josepa ND
Nur, Muhammad
Hidayanto, Eko
The influence of echo train length (ETL) toward image quality of sagital lumbal on MRI using T2-weighted FSE was analyzed on 20 images from four patients. Quantitative data analysis was performed using ROI two methods: image processing method on MRI’s computer and using matlab software, then conducted the statistical test. The result of SNR from these two methods obtained the highest value of SNR at CSF tissue and the highest value of CNR at CSF-corpus tissue and CSF-medulla spinalis with ETL=16. From statistical test of SNR result directly from MRI’s computer image was obtained the significant value at corpus tissue = 0.603, CSF = 0.082, and Fat = 0.213 (P > 0,05), discus = 0.022, Medulla Spinalis (MS) = 0.010 (P < 0.05), and for CNR result of CSF-corpus tissue has significant value = 0,023, corpus-MS = 0.011 (P < 0.05). By using matlab programming method obtained significant SNR result at corpus tissue = 0.000, CSF = 0,000, Fat = 0,000, discus = 0,000, Medulla spinalis = 0,000 (P < 0,05), and for the CNR result of Dicus-corpus tissue has significant value = 0.044, Dicus-MS= 0.045 (P , 0.05). These results pointed out that ETL and T2 weighted influence the Image quality of MRI, which are the image contrast at FSE and software ability of matlab to analyze the image quality of MRI. SNR and contrast are important aspect in the process of image optimization, the higher SNR value provide the better image in giving diagnose information. Keywords : MRI, Echo train length (ETL), K-space, Fast spin echo, Contras to noise ratio, Signal to noise ratio.
BERKALA FISIKA
2014-01-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/6575
BERKALA FISIKA; 2014: Berkala Fisika Vol. 17 No. 1 Tahun 2014; 7-12
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/6575/5409
oai:ojs.ejournal.undip.ac.id:article/3048
2012-04-06T20:07:37Z
berkala_fisika:RA
Pengukuran Panjang Koherensi Menggunakan Interferometer Michelson
Setyaningsih, Agustina
Marhaendrajaya, Indras
Firdausi, K. Sofjan
A simple measurement of coherence length of He-Ne laser, red diode laser, and green diode laser using Michelson interferometer has been conducted. The steps in this research were setting up the Interferometer by places movable mirror on mirror rail. To determine the coherence length of the laser’s light, movable mirror has been shifted until the interference fringes disappear on the screen. Results of measurement for the coherence length of He-Ne laser I is cm, He-Ne laser II is cm, red diode laser I is cm, and green diode laser II is cm. Keywords: Coherence, coherence length.
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3048
BERKALA FISIKA; Vol 10, No 4 (2007): Berkala Fisika; 169-173
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3048/2729
oai:ojs.ejournal.undip.ac.id:article/8882
2015-08-01T18:12:55Z
berkala_fisika:RA
PENGARUH PENAMBAHAN MINYAK GORENG HEWANI PADA MINYAK SAWIT TERHADAP PERUBAHAN SUDUT POLARISASI
Kaltsum, Ummi
Idrus, Hadiyati
Firdausi, K. Sofjan
The use of animal oil for various purposes by the people has inspired this study. The purpose of the study was to distinguish the mixture of cooking oil palm and variety of animal oil (chicken oil, beef oil, and pork oil). The composition of the mixture of palm oil and animal oil is 3:1 mL, respectively. The light source used were He-Ne laser of 1 mW (λ = 633 nm) and IR lamp of 250 watt (λ = 750-800 nm). Measurements were made based on changes in the natural polarization angle (0 kV) and electrooptics (6 kV). The result showed that the natural polarization angle changes and electrooptics of mixture of palm oil and animal oil greater than pure palm oil, both at He-Ne laser and IR light. This is consistent with the results of the titration test, peroxide value and free fatty acids (FFA) oil mixture was greater than pure palm oil. Change in the polarization angle represents the presence of saturated fatty acids. Animal oils have saturated fatty acid content greater than palm oil, so the polarization angle changes of oil mixture is greater than polarization angle changes of pure palm oil. Keywords: animal frying oil, palm oil, polarization angle
BERKALA FISIKA
2014-07-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/8882
BERKALA FISIKA; 2014: Berkala Fisika Vol. 17 No. 3 Tahun 2014; 109-114
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/8882/7217
oai:ojs.ejournal.undip.ac.id:article/3064
2012-04-07T08:46:30Z
berkala_fisika:RA
PEMBAKARAN FERRALSOL DAN APLIKASINYA UNTUK PENJERNIHAN MINYAK GORENG SISA PAKAI
Suhartana, Suhartana
Ferralsol is tropical type land, which exploited as rice field farm and plantation. Other benefit which can be taken away from this ferrasol if burned hence will be able to make liquid cleaner material. Composition of ferralsol is ferralsol orthic and ferralsol plinthic. If burned is good for purification liquid material, inorganic and also organic material. In this research result of combustion from ferralsol, used to make clear ex- cooking oil. Result of which scored a number of peroxide go down 12,75 %, number of acid also go down 8,33 %, by ferralsol, and a number of peroxide go down 19,45 %, number of acid also go down 10,42 % by burning ferralsol but with both ex- cooking oil color become clear progressively. Keyword: ferralsol, liquid cleaner material
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3064
BERKALA FISIKA; Vol 10, No 2 (2007): Berkala Fisika; 71-78
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3064/2745
oai:ojs.ejournal.undip.ac.id:article/2703
2012-03-29T15:32:53Z
berkala_fisika:RA
Kajian Proses Sterilisasi Media Jamur Tiram Putih Terhadap Mutu Bibit Yang Dihasilkan
Desna, Desna
Puspita, R. D.
Darmasetiawan, H.
Irzaman, Irzaman
Siswadi, Siswadi
Sterilization media were done in drum. Fuels LPG.is used for the fuel Efficiencies of the fuel gained in the media sterilization oyster mushrooms for 6 hours is 40.74%, meanwhile efficiencies of the fuel for 8 and 10 hours is 59.57% and 53.14%. The physical and economical research of the white oyster mushrooms sterilization process for 8 hours produces the highest efficiency. Keywords: Medium, oyster mushrooms, LPG, sterilization
BERKALA FISIKA
2012-03-28
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2703
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika; 45-48
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2703/pdf
oai:ojs.ejournal.undip.ac.id:article/10834
2016-04-21T12:14:24Z
berkala_fisika:RA
STUDI PENGARUH UKURAN PIXEL IMAGING PLATE TERHADAP KUALITAS CITRA RADIOGRAF
Sudin, Ahmas
Muhlisin, Zaenul
Widiyandari, Hendri
pixel, imaging plate, image quality, contras, density
This study aims is to determine the image on imaging plate which has a different pixel sizes. In this research, the X-ray apparatus and Computed Radiography (CR) which is used in the diagnostic field was used. The three imaging plate each having size of 0.097 mm, 0.115 mm and 0.168 mm with stepwedge objects on it was used. The exposure factor was adjusted at 64.5 kV and 16 mAs. The each of imaging plate were exposure three times. The results of each radiograph imaging plate were measured by using a densitometer. By measuring the Stepwedge radiograph, it was obtained the density and contrast value of each imaging plate. Contrast value for each imaging plate were compared to obtain the imaging plate that have a higher contrast value. This research resulted that each different pixel sizes on the imaging plate would generate a different image quality. Keywords: pixel, imaging plate, image quality, contras, density
BERKALA FISIKA
2015-07-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/10834
BERKALA FISIKA; 2015: Berkala Fisika Vol. 18 No. 3 Tahun 2015; 89-94
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/10834/8569
oai:ojs.ejournal.undip.ac.id:article/3080
2012-04-07T12:32:07Z
berkala_fisika:RA
Survei Resistivitas untuk Menentukan Distribusi Tahanan Jenis Batuan Bawah Permukaan Cekungan Daerah Sedimentasi Kuwu
Yuana, Taufiq
Yulianto, Gatot
Geophysical survey with resistivity method has been done in Bledug area, Kuwu, Grobogan, Central Java which have geology or geophysic phenomena mud blast or mud volcano. The principle resistivity method is measurement resistivity of rock by conducting current and also measure potential difference.This survey using NANIURA Resistivitymeter Model NRD 22S. Resistivity measurement has been done sounding with schlumberger configuration. The result 3 sounding point, northside, southside and among bledug area. Data processing using IPI version 6.0 for windows program. The result of data processing is thickness and rock resistivity. Final interpretation made with combining sounding data and geology data so that subsurface picture of resistivity distribution. The result of final interpretation shown bledug area and surrounding is thicknesses which have a distribution resistivity of rock has the range 0,1-1 Ωm. The conclusion that survey area is flake from salt dome. Keywords: Bledug Kuwu, resistivity method, mud vulcano
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3080
BERKALA FISIKA; Vol 9, No 4 (2006): Berkala Fisika; 185-89
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3080/2761
oai:ojs.ejournal.undip.ac.id:article/2812
2012-03-29T15:28:20Z
berkala_fisika:RA
Quantitative Elemental Analysis of Alkaline Metals in Environmental Samples using Liquid Electrode Plasma Optical Emission Spectrometer
Hidayanto, Eko
Yamamoto, Takashi
Kawai, Jun
Element in bottle drinking water, 100% orange juice and coffee and unknown element and concentration in environmental sample were quantitatively analyzed using a portable elemental analyzer of liquid electrode plasma optical emission spectrometer. In order to carry out this purpose, calibration of known element sample was firstly prepared by measuring its emission intensity in various concentrations. Sodium and potassium were commonly detected by this spectrometer, however other elements such as calcium and magnesium were not detected due to the minimum detection limit. The detected element by this portable analyzer shows that its accuracy is enough for quantitative analysis of environmental samples.
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2812
BERKALA FISIKA; Vol 12, No 2 (2009): Berkala Fisika; 49-54
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2812/pdf
oai:ojs.ejournal.undip.ac.id:article/23852
2019-06-25T13:47:00Z
berkala_fisika:RA
PENGUKURAN PERMITIVITAS KOMPLEKS MATERIAL MAGNETIK MENGGUNAKAN METODE S-PARAMETER DENGAN PENDEKATAN NICOLSON ROSE-WEIR
Priyono, Priyono
Abidin, Nur
Nurhasanah, Iis
Ferromagnetic, S-parameter, complek permittivity
Dielectric properties of material are important properties because it describes the interaction of material with electromagnetic waves. The complex permittivity value of material is interesting because it can represent on how much energy savings and dissipation when the material gets exposed to electromagnetic waves. The aim of this paper was to determine complex permittivity by Nicolson-Ross-Weir (NWR) method. The NWR method was based on the phenomenon of reflection and transmission of electromagnetic wave that drip on materials. The values of the reflection coefficient () and the transmission coefficient (T) were derived from reflection (S11) and transmission (S12) parameters. Determination of real permittivity in the frequency range of 10 GHz to 15 GHz of BaFe12O19 material was ε ’ = 4.36 and ε ” = 6.23. The second sample was BaFe9 (MnCo)1,5Ti1,5O19, the values of ε ’ = 5.49, while ε ” = 9.35. From the two test materials, it was revealed that in the frequency range of 10 GHz to 15 GHz, absorption did not occur in BaFe12O19, while in BaFe9 (MnCo)1.5Ti1,5O19 absorption occured at 13.0 GHz.Keywords: Ferromagnetic, S-parameter, complek permittivity
BERKALA FISIKA
2019-06-24
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/23852
BERKALA FISIKA; Vol 22, No 2 (2019): Berkala Fisika Vol. 22 No. 2 Tahun 2019; 56-61
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/23852/15387
Copyright (c) 2019 BERKALA FISIKA
oai:ojs.ejournal.undip.ac.id:article/3097
2012-04-07T12:39:01Z
berkala_fisika:RA
LINIERISASI KELUARAN PENCATU DAYA MENGGUNAKAN KOMPUTER
Sumariyah, Sumariyah
Endro Suseno, Jatmiko
Arimono, Ibnu
A power supply with linier output voltage that controlled by computer has been made. The range of output power supply is +2 until +16 volt. For providing a voltage with a linier output by turning around the potentiometer in the power supply. The potentiometer is turned around by motor stepper that controlled by computer. The step angle of motor stepper is reduced by the gear combination with transmission ratio 59:26. Step angle reduction for mechanical rotate movement are 0.8° per step and with rising of the output power supply 0.1 volt per step. This system had been realized and can work with voltage that we want and output voltage have a tolerance 0.06
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3097
BERKALA FISIKA; Vol 9, No 2 (2006): Berkala Fisika; 71-80
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3097/2778
oai:ojs.ejournal.undip.ac.id:article/2888
2012-03-29T15:28:20Z
berkala_fisika:RA
Ozone Generator by Using Dielectric Barrier Discharge Plasma Technology With Spiral-Cylinder Configuration: Comparison Between Oxygen and Air As Sources
Nur, Muhammad
Supriati, Aris
Hari Setyaningrum, Dyah
Gunawan, Gunawan
Munir, Mohammad
Sumariyah, Sumariyah
The ozone generator with Dielectric Barrier Discharge Plasma Technology (DBDPT) with Spiral-cylinder configuration has been developed. DBDP Reactor was constructed with spiral wire and cylinder. Plasma condition has been generated by using AC high voltage Ozone has been produced by this technology with oxygen and dry air as sources for ozone generating. In this research we found that the concentration of ozone produced increases with increasing voltage with a time constant. This concentration also increases with increasing time in certain applied voltage. Ozone concentration was higher than the concentration of dissolved ozone in water. Dissolved ozone in water was only 10 % of ozone produced and only 7 % for dry air as source. Oxygen as source of ozone was better than dry air; both for ozone produced and dissolved ozone in water. Keyword : Ozone, Spiral-cylinder, DBDP, Oxygen, Dry air
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2888
BERKALA FISIKA; Vol 12, No 2 (2009): Berkala Fisika; 69-76
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2888/2571
oai:ojs.ejournal.undip.ac.id:article/4976
2013-05-27T11:08:16Z
berkala_fisika:RA
PERANCANGAN SISTEM PENGENDALIAN SUHU DENGAN PENGENDALI PID MENGGUNAKAN ESTIMASI ARX
Khuriati RS, Ainie
In this paper ARX estimation methodology used to design a PID controller for temperature control of the air heater. The step input applied on heating systems and logging the data toMATLAB via a data acquisition system. The data obtained is used to identify the model of the processin the form of ARX. PID parameters obtained by minimising a standard integral errors using theleast squares method. Then, the results were compared with the classical methodsKeywords: PID, Identification, air heater
BERKALA FISIKA
2012-01-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4976
BERKALA FISIKA; Vol 15, No 1 (2012): Berkala Fisika; 1-6
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4976/4509
oai:ojs.ejournal.undip.ac.id:article/2934
2012-03-30T15:03:09Z
berkala_fisika:RA
PENGARUH FAKTOR EKSPOSI PADA PEMERIKASAAN ABDOMEN TERHADAP KUALITAS RADIOGRAF DAN PAPARAN RADIASI MENGGUNAKAN COMPUTED RADIOGRAPHY
Fahmi, Arif
Firdausi, K. Sofjan
Setia Budi, Wahyu
It has been researched about the change of exposure factors in radiographic examination of abdomen to radiographic quality and radiation exposure using computed radiography. The change of exposure factors to radiographic quality is obtained by measurement of radiographic density, which transmitted to step wedges and phantom abdomen. The density difference of step wedge and abdomen at each change of exposure factors result in radiographic contrast. To obtain radiation dose for patients, it is accounted by analytic method. The affect of scattering rate dose is obtained by measurement of scattering exposure rate using survey meter with positioned 100 cm from the object. The result of experiment shows that change of exposure factors in radiographic examination of abdomen makes no significant difference between radiographic density and contrast; however, it has decreased the patient dose. Keywords: radiation exposure, radiographic density and contrast
BERKALA FISIKA
2012-03-30
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2934
BERKALA FISIKA; Vol 11, No 4 (2008): Berkala Fisika; 109-118
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2934/2622
oai:ojs.ejournal.undip.ac.id:article/4994
2013-05-27T16:00:23Z
berkala_fisika:RA
IDENTIFIKASI DAN PERANCANGAN PENGENDALI PID MENGGUNAKAN PENDUGA ARX TERHADAP SISTEM PEMANAS UDARA DENGAN KRITERIA ISE, IAE, ITSE DAN ITAE
Khuriati RS, Ainie
In this paper ARX estimation methodology used to design a PID controller for temperature control of the air heater. The step input applied on heating systems and logging the data to MATLAB via a data acquisition system. The data obtained is used to identify the model ofthe process in the form of ARX estimator. PID parameters obtained by minimising the standard errors integral(IAE, ISE, ITSE and ITAE).Keywords: PID controller, Tuning, ARX Identication, Error Integral ,and air heater
BERKALA FISIKA
2012-10-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4994
BERKALA FISIKA; Vol 15, No 4 (2012): Berkala Fisika; 105-112
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4994/4527
oai:ojs.ejournal.undip.ac.id:article/2991
2012-04-03T15:26:24Z
berkala_fisika:RA
Sudut Putar Jenis Elektrooptis pada Bensin dan Spiritus
Riyani, Riyani
Marhaendrajaya, Indras
Firduasi, K. Sofjan
In this paper, we measured the specific electro optic rotary power h of petroleum and spiritus solution in static external electric field Eex using Kerr Effect. The magnitude field to induce the samples is produced by two parallel plates (3 ´ 4 cm2) applied on varied DC high voltage 0-10 kV. Variation of NaCl solution is held on 5%, 10%, until 35%. The light source used to observe change of polarization angle is diode pointer laser 654 nm in wavelength. From the result of experiment we obtained that theh’s value of petrol is (0.1040.008) o/V and for spiritus is (0.0660.006) o/V, indicates that Petrol optics more active than spiritus one. Key words: non-linear optics, external electrics field, specific electro optic rotary power
BERKALA FISIKA
2012-04-03
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2991
BERKALA FISIKA; Vol 11, No 1 (2008): Berkala Fisika; 5-8
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2991/2675
oai:ojs.ejournal.undip.ac.id:article/3002
2012-04-04T07:37:38Z
berkala_fisika:RA
Pembuatan ADC (Analog to Digital Converter) Untuk Rancang Bangun Instrumentasi Temperatur Tinggi Menggunakan Prinsip Defleksi Laser He-Ne Sebagai Bagian Dari Sistem Kendali Operasi Di Bidang Industri
Kadarisman, Nur
Sumarna, Sumarna
Rosana, Dadan
Monitoring and control all process variables such as power, temperature, and pressure is an absolute necessity in the field of industry. Instrumentation is a tool that can be used to monitor and control the process variables. From the monitoring results it can be seen whether the system is running in accordance with the desired or not. If deviation occurs, then the control action is needed so that the process can run as expected (the operating control system). One of the instrumentation equipment that need to be investigated is the use of laser deflection, because the laser beam that has a coherent nature, so that this instrumentation can be a very useful tool in the industry. At that stage the second year of this research study focused on the process input and data analysis with the aid of a microcontroller as a stage before applied in the modeling industry. The study was conducted in two stages, namely the manufacture of the ADC program that can send data voltage to the computer via RS 232 serial cable and making the ADC data acquisition software in the computer so the computer can act as a collection station, storage, and display data. This software use Borland Delphi 7. The results showed that the graph can be known voltage variations can indicate changes in certain deflection. The value of this deflection will determine the temperature of which is shown by the graph. Changes in the analog signal from the source of the potentiometer into a digital signal using ADC is inversely proportional, which is indicated by a linear graph with a correlation R = 0.99079 Graph showing the relationship between deflection with temperature according to the graph of the results of previous years of research that is done manually. Thus, further stay pending the outcome of the development of an acceptable deflection pattern detector equipped with a data acquisition system, as the final stage before implemented in the industry. Data acquisition system consists of two parts: signal conditioning systems and interfaces. If the detector is subjected by a laser beam, the optical signal is converted into electrical signals. This causes an electrical current. Because the electric current generated by the detector is very small, it needs to be strengthened and transformed into voltage by a signal conditioning system.Temperatures are measured in a particular room will cause the laser beam deflection at a certain distance so it can be used for high temperature control system. Keywords: ADC, Instrumentation, He-Ne Laser, Borland Delphi
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3002
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus; B31-B38
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3002/2686
oai:ojs.ejournal.undip.ac.id:article/6178
2014-02-10T09:36:47Z
berkala_fisika:RA
PEMBUATAN LAPISAN FOTOKATALIS ZINC OXIDE (ZnO) DENGAN TEKNIK SPRAY COATING DAN APLIKASINYA PADA PENGERING JAGUNG
Hidayanto, Eko
Sutanto, Heri
Firdausi, K Sofjan
Arifin, Zaenal
ZnO thin film has been deposited on the glass with a spray coating technique. Gel of ZnO 0.5 M was synthesized by dissolving 0.5 M zinc acetate dehydrate in isopropanol andmonoethanolamine solution at room temperature with the molar ratio of MEA and ZnAc is 1:1. The solution was stirred using a magnetic stirrer at 70°C for 30 minutes to get the clear and homogeneous ZnO gel. ZnO gel is placed on the spray hole and sprayed on a heated glasssubstrate till 40oC. Then, the spraying layer spraying was allowed to stand for 3 days tostrengthen the contact with glass layer. Deposition results of ZnO layer is transparent withtransmittance values of 71.4 % and decreases with a decrease in wavelength imposed on the layer.The energy dispersive X-ray (EDX) results show the composition of zinc (Zn) is less than theoxygen (O) with a ratio Zn : O = 38.44 % : 61.56 %. The scanning electron microscopy (SEM)results show ZnO thin film has a smooth and homogeneous surface with a grain size of 57 nm. Thetest results demonstrate ZnO layer has a band gap value of 3.01 eV. The drying corn shows thatdirectly drying using sunlight has a faster rate compared using ZnO glass. Surface morphology ofthe layer of dried corn using ZnO glass has brighter color and lice compared to directly drying onsunlight.Keywords: Photocatalyst, ZnO, Thin Film, Spray Coating, Corn, Drying
BERKALA FISIKA
2013-10-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/6178
BERKALA FISIKA; Vol 16, No 4 (2013): Berkala Fisika; 119-124
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/6178/5234
oai:ojs.ejournal.undip.ac.id:article/3042
2012-04-07T12:47:29Z
berkala_fisika:RA
Model Pembelajaran Untuk Meningkatkan Keterampilan Proses Ipa-Asesmen Dan Pembelajaran Tematik Calon Guru Sekolah Dasar
Siahaan, Parsaoran
Liliasari, Liliasari
This research is part of a series of research and development to improve the mastery learning model of prospective elementary school teachers in science and pembelajarannya.Model learning concepts developed in this research is the learning model that integrates two different courses are semester courses the concept of science and science education. Scenario learning is done in four phases, namely: (1). Modeling phase, (2) phase of discussion, (3). Enrichment phase, and (4) peer learning phase. The study was conducted on students of teacher candidates in two PGSD who take shelter in the Indonesian Education University of PGSD X sekota with the University and PGSD Y berdomosili in other cities within the same province.Subjects consisted of 25 students in PGSD X prospective teachers and 26 student teacher candidates at PGSD Y. The material consists of three pairs of research topics Magnet-Process Skills Science, Electrical-assessment in learning science and food-Thematic Learning. The research instrument used in the form of multiple choice tests and Description. Analysis of data using <g> dinormalisir gain from Hake. Research shows <g> PGSD X student teacher candidates related to science process skills and assessment including the classification was 0.57 ± 0.10 and high classification in thematic learning that is equal to 0.70 ± 0.14, whereas <g> student-teacher candidates PGSD Y including the classification is to Skills Assessment Process science and is equal to 0.68 ± 0.07, and medium for learning thematic classification that is equal to 0.53 ± 0.20. From <g> acquisition can be concluded that student teacher candidates PGSD PGSD Y better than X in Science Process Skills - Assessment, but lower in the Thematic learning. Key words: learning model, prospective teachers, science process skills, assessment, thematic.
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3042
BERKALA FISIKA; Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus; E1-E6
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3042/2724
oai:ojs.ejournal.undip.ac.id:article/7389
2014-09-24T09:09:21Z
berkala_fisika:RA
PREDIKSI PENURUNAN KUALITAS UAP PEMBANGKIT LISTRIK TENAGA GEOTERMAL DIHUBUNGKAN DENGAN STRATEGI PEMELIHARAAN DIMASA YANG AKAN DATANG
Mulyana, Cukup
Nurhilal, Otong
H Saad, Aswad
Taufik, Ahmad
In Geothermal power plant steam quality plays a very important role because it is associated with enthalpy and affects the reliability of the turbine. Studies have been carried out on the trend of a decrease in pressure, temperature and flow that comes out of a wellhead for 25 years. In addition the study also conducted in steam pressure drop duriing transmission process in the pipeline from the wellhead to the turbine due to friction factor , elevation , and junctions. Existing wellhead temperature is 202OC – 243OC, pressure of 8.2 kg/cm2 – 12.7kg/cm2. Operating parameters of the turbine are minimum pressure of 6.5 kg/cm2 and superheat temperature of 169oC. By looking at the trend of decrease in pressure and temperature, in the next few years is concerned to be achieved under the limit pressure. Concerning the decrease of enthalpy, give impact to decreasing of KWh. Therefore it should be anticipated from the beginning so it is not threat the continuity of the operation of geothermal power. From the study enthalpy did not decrease significantly in other hand the pressure drop significantly at the wellhead. The steam quality is still in good because the steam is superheated condition. The problem that needs to be addressed is the pressure drop from the wellhead to the turbine at 16.1 %. It is recommended to replace the T junction into a Y junction in order to minimize the pressure drop in the pipeline transmission. Keywords : steam quality, pressure, temperature, wellhead
BERKALA FISIKA
2014-09-24
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/7389
BERKALA FISIKA; 2014: Berkala Fisika Vol. 17 No. 2 Tahun 2014; 73-78
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/7389/6037
oai:ojs.ejournal.undip.ac.id:article/3059
2012-04-07T08:42:53Z
berkala_fisika:RA
Rancang Bangun dan Pengujian Sistem Reaktor Plasma Lucutan Pijar Korona guna Mempercepat Pertumbuhan Tanaman Mangrove
Triadyaksa, Pandji
Nur, Muhammad
Nasrudin, Nasrudin
Wasiq, J.
Plasma glow discharge corona reactor system has been made and tested to stimulate mangrove growth. Plasma glow discharge corona reactor consists of DC high voltage system and point to plate electode system. Reactor performance test has done on Rhizophora apiculata mangrove species. High voltage system mainly develop using TV fly back that been triggered by pulsed frequency using oscillator circuit. Point to plane electrode system was designed to maintain two electrode range remains 3 cm with number of point electrode plugged parallel with plane electrode are 63 pieces. Plasma glow discharge corona reactor tested was done on radiation process of mangrove seed by divided sample groups into 6 sample which have different time radiation and 1 sample that not been radiated as a control data. Mangrove growth was analyzed by measure the growth of mangrove plumulae after 17 days of cultivation. Research results shows that in developing plasma glow discharge corona to radiate mangrove, plasma reactor system works in 8 kV DC plasma voltage development. Mangrove growth after 6 time variation of plasma radiation shows a good effect of growth stimulation along with longer radiation time duration. The increase of mangrove growth was hypothetically caused by an increase of nitrogen concentration in mangrove seeds because of ion nitrogen fixation in the seeds during plasma radiation process
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3059
BERKALA FISIKA; Vol 10, No 3 (2007): Berkala Fisika; 137-144
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3059/2740
oai:ojs.ejournal.undip.ac.id:article/2456
2012-03-29T14:43:26Z
berkala_fisika:RA
Analisis Velocity Model Building Pada Pre Stack Depth Migration Untuk Penggambaran Struktur Bawah Permukaan Daerah ”x”
Triarto, Yose Rizal
Danusaputro, Hernowo
Harmoko, Udi
Pre Stack Depth Migration method has been carried out for 2D seismic reflection data on Line KPH-11807 at “X” area. This method was chosen for reconstruction geology features and imaging the subsurface structure. Based on previous investigation which done October, 2004-January, 2005, Line KPH-11807 at “X” area was a potential development as hydrocarbon prospect area which complex geology structure and strong lateral velocity variations. In the same area has been done previously with Pre Stack Time Migration by Elnusa Geosains, PT. Therefore the result of the PSDM can be compared to PSTM method. Seismic section with complex geology structure and/or strong lateral velocity variations area, which often there are at seismic data migrated stack can be overcome using an accurate velocity model. Velocity model building with the IVMB (interval velocity model building) concept consist of the coherency inversion and global tomography yield the right subsurface geological model. Hereinafter the velocity model will be used for the PSDM (pre stack depth migration) process. Result of PSDM shows a significant image enhancement, able to assure the reflection pattern at the horizons with strong lateral velocity variations and give the more coherence resolution compared with Pre Stack Time Migration seismic data. This study is very valuable in building exploration concept and development of the area, especially in a complex structure with strong lateral velocity variations. Keywords: PSDM, velocity model building.
BERKALA FISIKA
2012-03-19
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2456
BERKALA FISIKA; Vol 13, No 1 (2010): Berkala Fisika; 27-32
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2456/pdf
oai:ojs.ejournal.undip.ac.id:article/9664
2015-12-08T10:01:58Z
berkala_fisika:RA
INTERPRETASI MODEL ANOMALI MAGNETIK BAWAH PERMUKAAN DI AREA PERTAMBANGAN EMAS RAKYAT DESA CIHONJE, KECAMATAN GUMELAR, KABUPATEN BANYUMAS
Sehah, Sehah
Raharjo, Sukmaji Anom
Prasetyo, Chandra Adi
magnetic anomaly, gold mining, Village of Cihonje
Measurement of magnetic data has been done in the area of the gold mining in the village of Cihonje, the district of Gumelar, the regent of Banyumas in May to June 2013. Based on the modeling that has been conducted on the local magnetic anomalies along cross section of AB obtained six models of subsurface rock, while for along cross section of AB obtained five models. Based on the modeling results, rock formations that developed in the research area are Tapak formation, Halang formation, andesite-basaltic, and the alternating formation of the sandstones with some other rocks. The magnetic susceptibility of subsurface rock in the research area are interpreted ranged from 0.0039 to 0.0174 cgs units with the average magnetic susceptibility of rocks is estimated equal to 0.0099 cgs units that interpreted as the alternating formation of sandstone and claystone from Halang formation. The mineralization of gold ore is estimated to occur in almost of all subsurface rocks, but the most dominant mineralization is estimated to occur in the Halang formation especially on the alternating formation of sandstone and claystone. The gold ore mineralization occurs in the form of veins of pyrite, chalcopyrite, galena, and the others, that fill the cracks and the pores of the rocks. Keywords: magnetic anomaly, gold mining, Village of Cihonje
BERKALA FISIKA
2015-04-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9664
BERKALA FISIKA; 2015: Berkala Fisika Vol. 18 No. 2 Tahun 2015; 51-58
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/9664/7741
oai:ojs.ejournal.undip.ac.id:article/3075
2012-04-07T08:52:55Z
berkala_fisika:RA
Estimasi Arah Strike menggunakan Metode Resistivitas Konfigurasi Persegi
Cahyono, Agung
Yulianto, Gatot
The sounding square array resistivity method had been used to estimate strike orientation in a sub surface anomaly model. The advantage of square array are more sensitif in an anisotropic medium such as strike than inline array. Strike is an important factor to placed an array configuration in resistivity method. The array commonly lay down paralel or perpendicular with a strike depend on anomaly structure. The mapping square array was used to detect the model anomaly.The sounding square array were measured by rotating array with azimuth ,,, and . The sounding square array had an electrode spacing 1 m, 1,4 m, 2 m and 2,8 m. Azimuthal apparent resistivity was obtained by calculation and then was plotted into Rossete diagram. The estimation of strike orientation was determined perpendicularly from maximum azimuthal apparent resistivity. The mapping square array used 10 m array spacing with 1 m electrode spacing. The Wenner array used 5 m with 0,5 m electrode spacing.Strike orientation was estimated on N 90 E. This estimation was based on result each electrode spacing on the sounding square array. The existing model anomaly were detected on 5 m until 7 m on mapping square array. The result of Wenner array modeling showed that anomaly model was detected on 2,5 m until 3,5 m on N 40 W. This result showed that the sounding square array can be applied to determine strike orientation which usually exist on geological structure Keywords: square array resistivity, strike,azimuth
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3075
BERKALA FISIKA; Vol 10, No 1 (2007): Berkala Fisika; 45-51
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3075/2756
oai:ojs.ejournal.undip.ac.id:article/2794
2012-03-29T12:53:44Z
berkala_fisika:RA
Rekontruksi Citra Tomografi Sinar-X Flouresens 2D Berbasis Teknik Radiografi Digital Menggunakan Bahasa Pemrograman Matlab 7.1
M.Si, Sumariyah
Muhlisin, Zainul
Setiawati, Evi
This research has been done Recontructing of 2D X-ray Flouresense Tomographic Imaging Basis on Digital Radiograhy Technique using MATLAB 7.1 Programming The research uses an unit Computed Radiografi, a rotated obyect and a reconstruction programme imaging. The shape of rotated object is prisma which made of acrylic, lenght 18 cm and size sisi 6 cm. The prismacan rotate continue and as cor of the rotatd obyek uss asylinder still. Recontruction 2D tomographic imaging build from 25 rotatd object radiograf imaging result of expose Computed Radiografi with expose factor constant ang interval increasing rotated angle7,50 . The reconstruction programme 2D Tomographic consist of the cropping programme which produces 25 slice rotatd obyect forming sinogram and the programm Transformation invers Radon. The result of 2D Tomographic reconstruction in this rsearch obtain cross-sectionalprisma imaging is circle in the triangle sisi same imaging which habrur. Keywords: recontruction, tomography and radiography
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2794
BERKALA FISIKA; Vol 13, No 4 (2010): Berkala Fisika; 133-138
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2794/pdf
oai:ojs.ejournal.undip.ac.id:article/23479
2019-06-25T13:50:25Z
berkala_fisika:RA
KARAKTERISASI REAKTOR PLASMA BERARUS NEGATIF DENGAN KONFIGURASI ELEKTRODA TITIK-BIDANG DAN PENERAPANNYA PADA KAIN POLYESTER RAJUT GREY
Hasan, Siti Nurjannah
Muhlisin, Zaenul
Triadyaksa, Pandji
Arianto, Fajar
Plasma corona, multi-point field, ion mobility, polyester fabric, textile treatment, the meeting properties of fabric.
Research on characterisations of plasma reactor with negative current of square-point electrode configuration and its application on grey polyester knit fabric has been carried out. The objectives of this reseach were obtaining characterisation of negative plasma reactor, either with or without sample of the polyester knit fabric, getting ion mobility value, gaining the characterisation of irradiated polyester knit fabric of grey, and obtaining SEM results indicating the morphological changes of the fabric. A Plasma-Electrode Point Plasma reactor which is connected to a high-voltage DC power plant was used in this study. The size of pointfield electrodes was 15 x 15 cm2 with a 1.6 cm needle. The size of the grey knit polyester fabric used was 10 x 10 cm2. Variations in distance between electrodes were 1.5 cm, 1.8 cm, 2.1 cm 2.4 cm, 2.7 cm, 3.0 cm, and 3.3 cm. The results have shown that if the voltage increases, then the current value increses. The voltage which is needed to produce a lower current values is that the presence of a polyester knit fabric of grey. The highest voltage and current values witout sample can be found at a distance of 3.3 cm with a current value of 2.5 mA at a voltage of 3.027 kV, compared with presence of a sample, a current value of 1.6 mA at a voltage of 3.445 kV. The greater distance of the electrode, the smaller ion of the mobility is achieved. Based on the results of the water drop test showed that the longer the irradiation of the cloth, the faster duration of absorption. This is indicated by a distance of 2.4 cm in the duration of 5 minutes obtained the absorption time of 2.15 seconds while in the duration of 35 minutes obtained 1.47 seconds. In the SEM test, it is used 2 cloths where the first cloth used as a control or not subjected to plasma that has little damage where as the second fabric is subjected to plasma treatment with the time of irradiation is about 20 minutes that have damage or peeling on the surface of polyester knit fabrics grey.Keywords: Plasma corona, multi-point field, ion mobility, polyester fabric, textile treatment, the meeting properties of fabric.
BERKALA FISIKA
2019-05-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/23479
BERKALA FISIKA; Vol 22, No 1 (2019): Berkala Fisika Vol. 22 No. 1 Tahun 2019; 16-23
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/23479/15168
Copyright (c) 2019 BERKALA FISIKA
oai:ojs.ejournal.undip.ac.id:article/3092
2012-04-07T12:36:38Z
berkala_fisika:RA
Uji Nilai Tahanan Jenis Polutan Air Laut Dengan Metode Ohmik Dan Geolistrik Tahanan Jenis Skala Laboratorium
Dwi Indriana, Rina
Danusaputro, Hernowo
Geoelectric method and ohmic method used to investigate sea water intrution (salinity) in aquifer layer.Resistivity data aquisition for 3 layer model and 3 concentration of salinity was in laboratory scale. By comparing resistivity data before and after adding sea water we get resistivity value for each layer. The research result is decreasing of resistivity value for increasing salinity concentration.
BERKALA FISIKA
2012-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3092
BERKALA FISIKA; Vol 9, No 3 (2006): Berkala Fisika; 145-149
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/3092/2773
oai:ojs.ejournal.undip.ac.id:article/2873
2012-03-29T14:25:06Z
berkala_fisika:RA
Kajian Spektrum Sinar-X 6 MV Menggunakan Simulasi Monte Carlo
Anam, Choirul
X-ray spectra produced by Elekta Linac for 6 MV beam have been evaluated using Monte Carlo simulation. In this simulation, Linac head was modeled using BEAMnrc code. X-ray sepctra, fluence vs position, and energy fluence vs position were determined using BEAMDP code. In this simulation, the SSD (source skin distance) was 90 cm and the field size of radiation was 10 x 10 cm2. Energy electrons arriving at the target (incident electron) was varied 5.7 MeV, 6.0 MeV, 6.3 MeV and 6.6 MeV. As for the radial intensity, FWHM values varied 1.0 mm, namely 0.5 mm, 1.0 mm, 1.5 mm and 2.0 mm. X-ray spectra were determined at the surface of the phantom. Iit was found that the curve 6 MV X-ray spectra has a shape not symmetry with an average energy of about 2 MeV. In the spectra there is no energy X-ray radiation value exceeds the kinetic energy of incident electrons. X-ray spectra is not affected by the width of electron beam striking on the target. if the electron energy increases, it will generate increased fluence and energy fluence, but no effect on the penumbra region (the edge of field size). If the electron beam width increases, it will result in the radiation field edge becomes less sharp or penumbra widening. Keywords — Monte Carlo Simulation, X-ray spectra, Linear Accelerator
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2873
BERKALA FISIKA; Vol 14, No 2 (2011): Berkala Fisika; 49-54
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2873/2556
oai:ojs.ejournal.undip.ac.id:article/4971
2013-05-27T11:15:05Z
berkala_fisika:RA
APLIKASI PRAKTIS MODEL IDENTIFIKASI AUTOREGRESSIVE MOVING AVERAGE EXOGENOUS (ARMAX) DENGAN METODA KUADRAT TERKECIL REKURSIF
Khuriati RS, Ainie
AbstractEffect on variations in power heating to air temperature in the mosquito box were modelled. Transfer function for temperature ranges from 34.93 oC to 39.93 C determinedexperimentally. A step function used to excite power control and its effect on the air temperaturemeasured. From these information, the transfer function in the ARX and ARMAX form determinedand compared. An analysis of the computational results has confirmed that the ARMAX model andthe recursive least square method are superior to the ARX model and the Extended Least Square method to model the thermal behaviour in the mosquito box as indicated by the level of fitting and system stabilitytedKeywords: Identification, prediction error method, caged mosquitoes
BERKALA FISIKA
2011-10-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4971
BERKALA FISIKA; Vol 14, No 4 (2011): Berkala Fisika; 107-114
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4971/4504
oai:ojs.ejournal.undip.ac.id:article/2929
2012-03-30T14:30:04Z
berkala_fisika:RA
Monsoon Effect at Flood Phenomena on 2002 and 2007 in DKI-JAKARTA
Gernowo, Rahmat
The monsoon effect one think especially represent to important matter as causes of floods happen in area of Jakarta. The research of convection pattern above area of DKI-Jakarta based on to existing perception data, which is expected will give the understanding of growth of convection cloud yield torrential rains and deliver floods in DKI-Jakarta on 2002 and 2007. The result of research into whereas in this research is obtained by the rain study of extreme in DKI-Jakarta. As rainfall data result of average from some stations is residing in DKI-Jakarta. The result of research is obtained by comparison analysis whereas, that cloud dynamics in DKI-Jakarta happened at around of December, January and February, where periodicity of monsoon takes place. Keywords: Monsoon, flood and cloud dynamics.
BERKALA FISIKA
2012-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2929
BERKALA FISIKA; Vol 12, No 1 (2009): Berkala Fisika; 7-13
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2929/2617
oai:ojs.ejournal.undip.ac.id:article/4988
2013-05-27T16:02:48Z
berkala_fisika:RA
AN IMPROVEMENT OF NEW TEST METHOD FOR DETERMINATION OF VEGETABLE OIL QUALITY BASED ON ELECTROOPTICS PARAMETER
Firdausi, K Sofjan
Triyana, Kuwat
Susan, Ade Ika
An improvement of measurement for determination of frying oil quality has been conducted based on electrooptics parameter. The samples were several palm oils, coconuts oil, arefine olive oil, and a corn oil. The measured electrooptics parameter was the change of light polarizationθ through the samples within an external electric field, which leads to the increase oftransmitted lightζ, obtained by tabulating θ via Malus’ Law. The electric field was produced by high DC voltage power supply 0-10 kV on two parallel plates in a separated distance of circa 1 cm. The sources of light were red diode laser 5 mW (λ=650 nm), green diode laser 5 mW (λ=532 nm), He-Ne laser 1 mW (λ=633 nm), and a 100W-ligth bulb. For palm oils, the average value Δζwas approximately between 3×10-4 and 8×10-4. For coconuts oil and corn oil, Δζ was in the rangevalue of palm oils. However for refine olive oilΔζ was the smallest, out of the range and indicated minimum amount of free radicals. The electrooptics parameter here could classify various types offrying oils, distinguish between fresh oils and used oils, and also distinguish between edible oilsand expired oils. This method could be an alternative quality test of frying oils. It conductedwithout additional treatments, relative simple, and quite accurate.Keywords: electrooptics, frying oil, polarization, transmitted light
BERKALA FISIKA
2012-07-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/4988
BERKALA FISIKA; Vol 15, No 3 (2012): Berkala Fisika; 77-86
1410-9662
en
oai:ojs.ejournal.undip.ac.id:article/2978
2012-04-03T12:35:19Z
berkala_fisika:RA
Identifikasi Penyebaran Dan Ketebalan Batubara Menggunakan Metode Geolistrik Resistivitas
Yulianto, Tony
Widodo, Sugeng
A Geoelectricity survey using Schlumberger configuration has been conducted in area X of Muara Muntai district, Kutai Kertanegara dictric East Borneo using Schlumberger configuration to probe the existence of coal. Modeling using matching curve to describe subsurface in X area base on 11 points sounding from field data acquisition The result indicates that the coal is within the depth of 60m-70m with a thickness of 1m-2m. Whereas the value of coal resistivity is in the reach 90 Ώm-120 Ώm. It can be then concluded that area X is not prospecting to exploitation. Keyword: Schlumberger configuration, coal, resistivity
BERKALA FISIKA
2012-04-03
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2978
BERKALA FISIKA; Vol 11, No 2 (2008): Berkala Fisika; 59-66
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/2978/2662
oai:ojs.ejournal.undip.ac.id:article/5007
2013-05-27T16:22:19Z
berkala_fisika:RA
EVALUASI PERUBAHAN STRUKTUR AKIBAT SUBSTITUSI PARSIAL ION Mn +2 DAN ION Ti PADA M HEKSAFERIT BaFe 12-2X Mn MENGGUNAKAN ANALISIS RIETVELD
Widiyanto, Widiyanto
Priyono, Priyono
Nurhasanah, Iis
Cationic interaction of Mn+2and Ti +4substitution on conventional hexaferriteBaFe O have been studied using X-ray diffraction (XRD) and analysis by the Rietveld method. These Research was conducted by combining compound of Fe O12 19 TiO2 to form (Fe,MnTi)2O phase3BaCO3 phase and heated at 1200. Then, Compound of (Fe,MnTi)0 C to form of BaFe12-2xresult of rietveld analysisshowed that the composition of Hexaferrite BaFe22 3, MnCO and3O phase mixed withMn Ti O3x x 19 compounds. The as main phase and Fe2Oas a second phase. At all compositions showed that the largerfraction of ions Mn+23 and Ti+4 ions able to change latice parameter from the volume unitcell of conventional hexaferrite. The results reatveld iteration of the phaseBaFe MnTiO (x = 1.0) obtained values of lattice parameters a = 5.9116 Ǻ and c =23.2532 Ǻ or shrinkage abaut 5,0 % volume unit cell and at BaFe Mn Ti O10 19 (x=2.5)the volume unit cell 7,0% lower than conventional hexaferrite.Keywords: Rietveld, unit cell, substitusi io, hexaferrite, 12-2x7 2.5 2.5 19Mn Ti Ox x 19
BERKALA FISIKA
2012-07-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5007
BERKALA FISIKA; Vol 14, No 3 (2011): Berkala Fisika; 81-86
1410-9662
eng
https://ejournal.undip.ac.id/index.php/berkala_fisika/article/view/5007/4540