2024-03-28T20:17:54Z
https://ejournal.undip.ac.id/index.php/index/oai
oai:ojs.ejournal.undip.ac.id:article/3114
2015-09-19T17:07:31Z
sm:Art
0854-0675
dc
EFFECT QUIXALUD ADDITTON ON FOOD PREFERENCE AND RESISTANCE FROM DEGRADATION
Izzati, Munifatul
Universitas Diponegoro
ABSTRACT---We investigate the effect of quixalud on food preference and resistance from degradation. Quixalud was choosen because of its antimicrobial properties but it is not an antibiotic. The aim of this research is to evaluate the effect of quixalud addition on food preference by tiger shrimp and its resistant from degradation. The experiment was designed using Factorial with two treatments: quixalud concentration and soaking period. We used three concentration of quixalud: 30 ppm 60 ppm and 90 ppm. Each concentration were soaked at difference period of time, which were:24 hours, 48 hours and 72 hours. Food preference and resistance from degradation were monitored. Results indicated that there was no different of shrimp food preference between quixalud feed and controls or feed without quixalud. However, there was a tendency that shrimp preferred feed with 60 ppm of quixalud. Quixalud has no effect on the remaining solid feed. It seem likely that the remaining solid feed is mainly affected by the strength of binder rather than the presence of an antibacterial compound, such as quixalud.
Keywords : quixalud, food preference, resistance, degradation.
Permalink : http://ejournal.undip.ac.id/index.php/sm/article/view/3114
JURNAL SAINS DAN MATEMATIKA
2010-01-01 00:00:00
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https://ejournal.undip.ac.id/index.php/sm/article/view/3114
JURNAL SAINS DAN MATEMATIKA; Volume 18 Issue 1 Year 2010
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8049
2016-05-02T10:02:46Z
sm:Art
"150112 2015 eng "
0854-0675
dc
Geochemistry of Three Spots on Stream Water around Gedongsongo Hot Springs
Aminin, Agustina L. N.
Biochemistry Laboratory, Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Suhartana, Suhartana
Chemistry Department, Science and Mathematics Faculty, Diponegoro University
Sriatun, Sriatun
Chemistry Department, Science and Mathematics Faculty, Diponegoro University
W., Didik S.
Chemistry Department, Science and Mathematics Faculty, Diponegoro University
Study on the physical characteristics, chemical content of water as well as microbiological composition in the area of geothermal hot springs in Gedongsongo have been done. Water samples were collected on the area within streaming water with moderate temperature. The selection was done on the basis of water that will enter into agricultural and residential areas. Water analysis includes physical analysis, such as temperature, water clarity and odor. While the chemical analysis comprised the oxide content of Mg and Ca. Anion analysis was also performed as sulfate, phosphate, bicarbonate and chloride. The microbiological composition performed using SSCP method for community analysis. The results showed a correlation between the temperature and the content of the anions. The higher temperature of water showed the higher level of anions. The existence of the metal oxide is directly proportional to the levels of the anions. The lower acidity of water showed the higher the levels of hydrogen sulfide. Bacterial composition based on SSCP profile showed a slight different of diversity.
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8049
JURNAL SAINS DAN MATEMATIKA; Volume 21 Issue 4 Year 2013
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3219
2015-09-19T17:05:40Z
sm:Art
0854-0675
dc
PENGGUNAAN KARAGENAN DARI RUMPUT LAUT (Euceema cotoni) SEBAGAI BAHAN PENDUKUNG (SUPPORT) PADA AMOBILISASI ENZIM PAPPAIN
Wuryanti, Wuryanti
ABSTRAK-Untuk menjaga kestabilan enzim hasil isolasi dilakukan amobilisasi enzim dengan metode penjeratan pada kagenan. Pada metode ini enzim dijerat oleh karagenan yang berfungsi sebagai matriks pendukung. Hasil amobil mengalami perubatrm kondisi optimum. Sebelum dilakukan amobilisasi enzim papain memiliki pH optimum sebesar 5,0 dan suhu opimum sebesar 35o C, amobilisasi enzim memiliki pH optimum 6,0 ; suhu opimum 41o C dan aktifitas spesifik enzim amobil dapat dipertahankan hingga pemakaian dua kali.
Kata kunci : Karagenan, Support, Amobilisasi, Aktivitas spesifik
JURNAL SAINS DAN MATEMATIKA
2009-01-01 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3219
JURNAL SAINS DAN MATEMATIKA; Volume 17 Issue 1 Year 2009
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/9134
2015-09-16T07:41:49Z
sm:Art
"150116 2015 eng "
0854-0675
dc
Prediction of 2D Isodose Curve on Arbitrary Field Size in Radiation Treatment Planning System (RTPS)
Nugraheni, Dewi Tri
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Gunawan, Vincensius
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Anam, Choirul
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
The study on prediction of 2D isodose curves for atbitrary field size has been done. Isodose curve is very useful for plannning and evaluation of doses received by patients in the radiotherapy treatment.
The percentage depth dose (PDD) and dose profiles data for standard field size (square) were obtained from measurements in the Kensaras hospital, Semarang Regency. Dose profiles were taken at a depth of 1.5 cm and a radiation source to skin distance (SSD) of 100 cm. The calculation of PDD data in any field size uses linear interpolation method. While the calculation of the dose profile curve uses the widening, narrowing and weighting interpolation method. Firstly, the calculation of PDD and dose profile for standard field sizes of 3x3, 10x10, 15x15 and 20x20 cm2 were carried out and the results were compared to the measurements. Secondly, the PDD and dose profile for arbitrary field sizes 7x7 dan 13x13 cm2 were calculated. After that, the isodose curves for arbitrary field sizes were generated.
The results showed that PDD curves of standard field sizes have maximum deviation values < 5% compared to the measurements. While the dose profile curves for field sizes up from 5x5 cm2 have maximum deviation values approximately 5% which was less than measurement. The profile curve of field size of 3x3 cm2 has maximum deviation value >5%. These results showed that our proposed algorithm was relatively valid. In this study, the PDD, dose profile and isodose curves of arbitrary field sizes 7x7cm2 and 13x13 cm2 were succesfully generated.
JURNAL SAINS DAN MATEMATIKA
2015-09-16 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/9134
JURNAL SAINS DAN MATEMATIKA; Volume 23 Issue 1 Year 2015
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3265
2015-09-19T17:10:06Z
sm:Art
0854-0675
dc
Estimasi Model Regresi Linier Dengan Metode Median Kuadrat Terkecil
Tarno, Tarno
Undip
ABSTRAK---Model regresi linier merupakan model yang paling sering digunakan dalam analisis statistika. Model regresi linier ini digunakan untuk menyatakan hubungan fungsional antara satu atau beberapa variabel bebas (prediktor) terhadap satu variabel terikat (respon). Dalam analisis regresi, mengestimasi parameter secara otomatis mengestimasi model regresi. Untuk memperoleh estimasi model regresi dapat dilakukan dengan beberapa metode antara lain: metode kuadrat terkecil, metode maksimum likelihood dan sebagainya. Salah satu metode yang paling populer adalah metode kuadrat terkecil (OLS). Pada prinsipnya metode kuadrat terkecil mengestimasi model regresi dengan meminimalkan rata-rata kuadrat sesatan (MSE). Dalam tulisan ini dibahas suatu metode alternatif untuk mendapatkan estimasi model regresi yaitu metode median kuadrat terkecil (LMS). Pada metode LMS, estimasi model yang diperoleh adalah suatu model yang memiliki median kuadrat sesatan terkecil. Prosedur estimasinya adalah dengan memilih p titik sampel (dengan p: banyaknya parameter di dalam model termasuk intersept) dari n titik sampel hasil pengamatan, kemudian ditentukan suatu persamaan yang melalui p titik tersebut. Setelah diperoleh sejumlah persamaan yang melalui p titik tersebut, kemudian ditentukan median dari residual kuadrat. Persamaan atau model yang diestimasi melalui p titik yang menghasilkan nilai median kuadrat terkecil merupakan model yang terpilih.
Kata Kunci: regresi linier, estimasi parameter, sesatan kuadrat
JURNAL SAINS DAN MATEMATIKA
2012-04-20 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3265
JURNAL SAINS DAN MATEMATIKA; Volume 15 Issue 2 Year 2007
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/10920
2016-05-02T10:44:57Z
sm:Art
"151001 2015 eng "
0854-0675
dc
Adsorption of Indigo Carmine Dye using Cetyltrimethylammonium Bromide (CTAB) Surfactant Modified Zeolite
Fauziyah, Nurul
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Sriatun, Sriatun
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Pardoyo, Pardoyo
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Research of indigo carmine dye adsorption using natural zeolite modified by cetyltrimethylammonium bromide (CTAB) surfactant has been done. The purpose of this study was to modify the natural zeolite using CTAB surfactant and to determine its ability on the adsorption of indigo carmine dye. The stages of the study included the activation of zeolites, modifying zeolites using CTAB surfactant and adsorption test of indigo carmine dye. The results showed that the zeolites could be modified by CTAB. They were then characterized by the existence of FTIR absorption band at wavelengths of 1404.18 cm-1 and 2800-3000 cm-1. The various concentration of indigo carmine (5, 10, 15, 20 ppm); contact time (15, 30, 45 minutes) and pH (3, 4, 5, 6, 7, 8, 9) were studied and the highest condition was reached at the 45 minutes, pH= 3 and indigo carmine concentration of 20 ppm for 0.5 and 1 mM CTAB (15.35% and 23%) and indigo carmine concentration of 5 ppm for 10 mM CTAB (96.18%). The adsorption of indigo carmine tended to increase with increasing the concentration and contact time and decreased with increasing the pH.
JURNAL SAINS DAN MATEMATIKA
2016-05-02 10:45:02
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/10920
JURNAL SAINS DAN MATEMATIKA; Volume 23 Issue 4 Year 2015
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3382
2015-10-14T09:54:47Z
sm:Art
0854-0675
dc
Pengamatan Efek Magnetooptis Menggunakan Interferometer
Fahrurazi, Michelson
Firdausi, Ketut Sofjan
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Budi, Wahyu Setia
Universitas Diponegoro
ABSTRACT---The magnetooptic effect of transparency material such as aquarium glass, acrylic, and micro slide has been studied using Michelson Interferometer. The change of refractive index to magnetic field B is obtained by placement of samples in a coil applied on altered field 0-0,2 T. Results of interferometer test show that change of refractive index is linearly dependent on B for acrylic and slide. However, for aquarium glass, it is on B2 dependency. This result is agreement to previous experiment that the structure of acrylic and slide is formed more regular as B applied.
Keywords: Magnetooptic effect, refraction index, interferometer
JURNAL SAINS DAN MATEMATIKA
2006-10-04 00:00:00
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https://ejournal.undip.ac.id/index.php/sm/article/view/3382
JURNAL SAINS DAN MATEMATIKA; Volume 14 issue 4 Year 2006
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/7898
2015-09-30T10:09:45Z
sm:Art
"141219 2014 eng "
0854-0675
dc
Simulasi Pengaruh Kombinasi Target-Filter Tambahan Terhadap Spektrum Sinar-X pada Tabung Pesawat Mammografi dengan Program EGSnrc
Budiwati, Trisna
Jurusan Fisika Universitas Diponegoro Semarang
Anam, Choirul
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Setiawati, Evi
Jurusan Fisika Universitas Diponegoro Semarang
The mammography use the specific x-ray energy. At high x-ray energies (>35 keV) the subject contrast between the normal and malignant tissues in the breast is poor, at very low x-ray energies (10-15 keV) the contrast is highest, however the high absorption result in a high tissue dose. To achieve to good result must be used the optimal energy, that could be achieved by using specific x-ray target and additional filter materials to generate characteristic x-ray of the desired energy. This research was aimed to evaluate the influence of target-additional filter combination and filter thickness to the x-ray energy spectrum.
The research was conducted by Monte Carlo simulation using EGSnrc program. The model of mammography tube was designed by BEAMnrc program, and phase space file was resulted by BEAMnrc was analyzed by BEAMDP. The tube x-ray contained of target and additional filter from molybdenum (Mo) and rhodium (Rh) material, window from berrylium, and collimator from Pb. Target-additional filter combination were Mo-Mo, Mo-Rh, Rh-Rh and Rh-Mo. Variation of additional filter thickness that be used are 0,001 mm; 0,03 mm; and 0,05 mm.
The results of the simulation indicated that an x-ray consist of bremmstrahlung and characteristic. X-ray spectrum were produced by Mo target had characteristic x-ray energy 17 keV and 19 keV, and Rh target had characteristic energy 20 keV and 23 keV. Target-additional filter combination that allowed are Mo-Mo, Mo-Rh, and Rh-Rh combination. Rh-Mo combination could not be used, because Mo filter would attenuated x-ray characteristic energy. For the Mo-Mo and Rh-Rh, the thicker the additional filter then the x-ray spectrum obtained has a more narrow, but the reduced intensity of the x-ray bremmstrahlung and characteristic.
Keywords: target-filter combination, x-ray spectrum, mammography, EGSnrc.
JURNAL SAINS DAN MATEMATIKA
2014-03-11 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/7898
JURNAL SAINS DAN MATEMATIKA; Volume 19 Issue 1 Year 2011
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8002
2015-09-19T16:54:40Z
sm:Art
"150108 2015 eng "
0854-0675
dc
Degradasi Pewarna Methylene Blue (MB) Menggunakan Fotokatalis WO3/Fe2O3 dengan Perbantuan Cahaya Matahari
Widiyandari, Hendri
Departemen of Physics, Faculty of Science and Mathematic, Diponegoro University, Jl. Prof. H. Soedarto SH, Semarang, Central Java 50275, Indonesia
Syam, Burhanudin
Departemen of Physics, Faculty of Science and Mathematic, Diponegoro University, Jl. Prof. H. Soedarto SH, Semarang, Central Java 50275, Indonesia
Degradation of dangerous pollutant with photocatalyst under solar or visible light radiation was a smart solution for environment pollution complication specifically for wastewater. an efficient photocatalyst which works at under wide spectrum from solar radiation. We reported the of tungsten oxide/ferric oxide (WO3/Fe2O3) composite with 6 variant weight ratio Fe additve (0%, 2%, 4%, and 6%)..
Methylene blue photodegradation result showed, the decrease intensity of C/C0 concentration more faster and constant especially for 6% additive co-catalyst Fe. Then, the photodegradation sample has result more pure than 5 sample others.
Keywords: WO3/Fe2O3, Photodegradation, photodeposition method, composite material, co-catalyst
JURNAL SAINS DAN MATEMATIKA
2014-03-25 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8002
JURNAL SAINS DAN MATEMATIKA; Volume 20 Issue 2 Year 2012
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8044
2015-09-19T16:48:42Z
sm:Art
"150112 2015 eng "
0854-0675
dc
Deteksi Jenis Padi Indica dan Japonica Padi Gogo Rancah Beras Merah Varietas Slegreng dan Mandel Berbasis Fragmen ORF100 dan ORF29
Haryanti, Wahyu Dewi U.
Magister Biologi, Fakultas Sains dan Matematika, Universitas Diponegoro
Kampus Tembalang, Semarang 50275, Jawa Tengah, Indonesia.
Kusumaningrum, Hermin P.
Jurusan Biologi, Fakultas Sains dan Matematika, Universitas Diponegoro
Kampus Tembalang, Semarang 50275, Jawa Tengah, Indonesia.
Budiharjo, Anto
Jurusan Biologi, Fakultas Sains dan Matematika, Universitas Diponegoro
Kampus Tembalang, Semarang 50275, Jawa Tengah, Indonesia.
Deteksi fragmen Open Reading Frame (ORF)100 dan ORF29 telah dilakukan pada dua jenis padi gogo rancah beras merah yaitu varietas Slegreng dan Mandel. Metode penelitian dilakukan dengan cara isolasi DNA kloroplas padi diikuti dengan amplifikasi PCR menggunakan optimasi suhu annealing pada tiga suhu yang berbeda, yaitu 53°C, 55°C, dan 56°C. Selanjutnya hasil amplifikasi divisualisasikan menggunakan elektroforesis pada gel agarose 1%. Suhu annealing 53°C merupakan suhu yang optimal untuk memperlihatkan fragmen ORF100 dan ORF29. Hasil penelitian menunjukkan bahwa fragmen ORF100 dan ORF29 dapat teramplifikasi pada padi Slegreng dan mandel, sehingga kedua jenis padi tersebut menunjukkan kecenderungan subspesies japonica. Perbedaan ketebalan dan ukuran pita tidak mempengaruhi keberadaan fragmen ORF100 dan ORF29 sebagai penanda untuk mengidentifikasi tipe indica atau japonica. Pemanfaatan marka molekuler fragmen ORF100 dan ORF29 dalam mendeteksi jenis padi diharapkan dapat melengkapi hasil karakterisasi dan pengelompokkan varietas padi berdasar karakter morfologi dan fisiologi.
Keywords: chloroplast DNA, ORF100, ORF29, indica-japonica differentiation
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8044
JURNAL SAINS DAN MATEMATIKA; Volume 21 Issue 4 Year 2013
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/7991
2015-09-30T13:05:53Z
sm:Art
"150107 2015 eng "
0854-0675
dc
Purifikasi DNA Kromosom Geobacillus sp. dYTae-14 Menggunakan Kolom Silika dengan Denaturan Urea
Ayu, Budi Putri
Jurusan Kimia, Fakultas Sains dan Matematika, Universitas Diponegoro Semarang
Sarjono, Purbowatiningrum Ria
Biochemistry Laboratory, Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Aminin, Agustina L. N.
Biochemistry Laboratory, Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Studi pemurnian DNA kromosom Geobacillus sp. dYTae-14 menggunakan silika gel dengan denaturan urea telah dilakukan. Pemurnian dilakukan dengan metode adsorpsi silika tanpa kolom dan dengan kolom untuk menentukan metode yang lebih efisien dalam pemurnian DNA kromosom. Metode adsorpsi silika dengan kolom dilakukan dengan sentrifugasi dan tanpa sentrifugasi. Variasi konsentrasi 6 - 9 M urea dengan 25 mg silika gel digunakan untuk mempelajari profil kapasitas urea dalam pemurnian DNA kromosom. Pengukuran tingkat kemurnian dan konsentrasi DNA dianalisis dengan metode spektrofotometri. Hasil menunjukkan bahwa metode adsorpsi silika yang efisien dalam pemurnian DNA kromosom Geobacillus sp. dYTae-14 adalah metode kolom silika dengan sentrifugasi. DNA yang diperoleh pada urea konsentrasi 6 – 9 M memiliki nilai kemurnian sekitar 1,2. Namun, urea 8 M merupakan konsentrasi optimum untuk pemurnian DNA kromosom karena diperoleh kadar DNA yang paling tinggi, yaitu sebesar 811 µg/mL
Keywords: pemurnian DNA kromosom, kolom silika, denaturan, urea.
JURNAL SAINS DAN MATEMATIKA
2014-03-24 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/7991
JURNAL SAINS DAN MATEMATIKA; Volume 19 Issue 4 Year 2011
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8023
2016-03-04T15:32:23Z
sm:Art
"150109 2015 eng "
0854-0675
dc
Pengayaan Yodium dan Kadar NaCl pada Garam Krosok menjadi Garam Konsumsi standar SNI Enrichment of Iodium and Sodium Cloride in the Traditional Salt become Consumtion Salt INS Standard
Nur, M.
Jurusan Fisika, Fakultas Sains dan Matematika Universitas Diponegoro
Marhaendrajaya, I.
Jurusan Fisika, Fakultas Sains dan Matematika Universitas Diponegoro
Sugito, Sugito
Jurusan Statistika, Fakultas Sains dan Matematika Universitas Diponegoro
Windarti, T.
Jurusan Kimia, Fakultas Sains dan Matematika Universitas Diponegoro
Arnelli, Arnelli
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Hastuti, R.
Jurusan Kimia, Fakultas Sains dan Matematika Universitas Diponegoro
Haris, A.
Jurusan Kimia, Fakultas Sains dan Matematika Universitas Diponegoro
Rahmanto, W. H.
Jurusan Kimia, Fakultas Sains dan Matematika Universitas Diponegoro
Widodo, Didik Setiyo
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Ariyanto, F.
Jurusan Fisika, Fakultas Sains dan Matematika Universitas Diponegoro
Muhlisin, Z.
Jurusan Fisika, Fakultas Sains dan Matematika Universitas Diponegoro
Suseno, J. E.
Jurusan Fisika, Fakultas Sains dan Matematika Universitas Diponegoro
Setiawati, E.
Jurusan Fisika, Fakultas Sains dan Matematika Universitas Diponegoro
Sutanto, H.
Jurusan Fisika, Fakultas Sains dan Matematika Universitas Diponegoro
Priyono, Priyono
Material Physics Laboratory, Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Izzati, M.
Jurusan Biologi, Fakultas Sains dan Matematika Universitas Diponegoro
Hariyati, R.
Jurusan Biologi, Fakultas Sains dan Matematika Universitas Diponegoro
Tana, S.
Jurusan Biologi, Fakultas Sains dan Matematika Universitas Diponegoro
Raharjo, B.
Jurusan Biologi, Fakultas Sains dan Matematika Universitas Diponegoro
Ispriyanti, D.
Jurusan Statistika, Fakultas Sains dan Matematika Universitas Diponegoro
Farikhin, Farikhin
Jurusan Matematika, Fakultas Sains dan Matematika Universitas Diponegoro
Rusgiyono, A.
Jurusan Statistika, Fakultas Sains dan Matematika Universitas Diponegoro
Suhartono, Suhartono
Jurusan Ilmu Komputer, Fakultas Sains dan Matematika Universitas Diponegoro
This research has been carried out in the quality improvement of traditional salt (krosok salt) into salt consumption for the Indonesian National Standard. This report is devoted to the elevated levels of NaCl and KIO3. Increased levels of NaCl and Iodine (represented by KIO3) is done by washing the salt with the traditional clothes washer with two rounds and by using water with saline solution at 22-24 Be (known as the old water). Traditional salt taken from three districts, such as Pati District, Jepara District, and Rembang District. We found that the concentration of NaCl in the treatment salt maximum is 96 % and Iodium or present of KIO3 is 40 ppm.
Key words: Salt, traditional, INS, Consumtion, NaCl, KIO3
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8023
JURNAL SAINS DAN MATEMATIKA; Volume 21 Issue 1 Year 2013
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3143
2015-09-19T17:06:09Z
sm:Art
0854-0675
dc
KARAKTERISTIK METODOLOGI PENELITIAN BIDANG ILMU KOMPUTER (IK) BERLANDASKAN PENDEKATAI\ POSITIVISTIK
Istiyanto, Jazi Eko
ABSTRAK---Belum adanya definisi secara baku mengenai IK, seringkali menimbulkan
pandangan/persepsi yang kurang tepat tentang IK, demikian pula untuk kajian penelitian juga masih terdapat
presepsi yang berbeda-beda. Untuk ini dibutuhkan proses persam&rn presepsi mengenai definisi, area,
metodologi, dan karakteristik penelitian IK. Penelitian IK dilakukan dengan pendekatan positivistik yang
memiliki karakteriktis analitik, nomotetik, dedikatif, laboratorik, pembuktian dengan logika, kebenman
universal, dan bersifat bebas nilai. Peneliatian IK dapat berbentuk penelitian rekayasa dan nonrekayasa.
Penelitian rekayasa memiliki tahapan secara life cycle yang terdiri dari tahapan plan, aialysis, construct, dan
applied. Hasil akhir penelitian rekayasa berbentuk model, formula, algoritma, struktur data, arsitektur, produk,
maupun sistem yang telah teruji, sedangkan hasil penelitian nomekayasa dapat berupa teori dan keputusan
yang telah teruji pula secara empiris.
Kata kunci : Positivistilg Life Cycle, Rekayasa, dan Nonrekayasa
JURNAL SAINS DAN MATEMATIKA
2010-10-22 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3143
JURNAL SAINS DAN MATEMATIKA; Volume 17 Issue 2 Year 2009
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/9007
2015-09-21T09:07:49Z
sm:Art
"141015 2014 eng "
0854-0675
dc
Speed Model Processing using Ray Tracing Method for 2D Depth Domain Migration (Pre Stack Depth Migration) on the field "AV"
Evita, Anjar
Diponegoro University
Danusaputro, Hernowo
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
The research was conducted to process 2D seismic data by Pre Stack Depth Migration (PSDM) method on the field “AV”. The purpose of this study was to determine the appropriate interval velocity model to manage the PSDM methods work. Interval velocity model obtained from the initial estimate using coherency inversion velocity model is usually not convergent. Interval velocity model should be improved through several stages in order the estimated speed could be closer to the actual speed value.
Some initial interval velocity model parameters should be improved to be more sensitive to lateral velocity variations for PSDM work. The method used to improve the velocity model was a horizon-based tomography using the ray tracing concept. These methods improved the layer speed and reflector geometry to produce a new interval velocity model.
Model errors should be corrected by residual move out analysis. The best analysis obtained was from the fifth iteration to eliminate errors and flatten depth gathers. The proper value of the speed produced good quality images. The results of this research was PSDM Section or PSDM cross-section. PSDM cross-section has a good image quality to represent the geological structures in the earth's sub surface.
JURNAL SAINS DAN MATEMATIKA
2015-08-30 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/9007
JURNAL SAINS DAN MATEMATIKA; Volume 22 Issue 4 Year 2014
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3260
2015-09-19T17:08:30Z
sm:Art
0854-0675
dc
Analisis Impedansi Elastik untuk Memprediksi Jenis Litologi Batuan dan Penyebaran Kandungan Fluida (Studi Kasus Lapangan MNWP– Pertamina DOH JBB)
P., M. Nurdin W.
Undip
Yuliyanto, Gatot
Undip
ABSTRACT--- An identification of fluid contents on oil and gas exploration field has to be applied to determine a hydrocarbon and develop production area. This is caused a bright spot method that is based on associated with gas from seismic section, as a hydrocarbon indicator is failure, thus need an alternative method to determine the hydrocarbon from fluid contents. The identification of fluid contents are carry out on ‘MNWP’ field from inline 1380 – 1490, crossline 5040 – 5720, time 100 – 2000 millisecond with 9 well log data and use 2 software i.e. PG 2.0 Probe 3D and Vanguard. The identification involves elastic impedance analysis to find low impedance on Parigi Formation and to lithology prediction from the formation as a reservoir layer. The analysis result of elastic impedance describes that on Parigi Formation is covered by carbonate and discover fluid contents distribution be oriented from south to north that process sedimentation appropriate.
Keywords: seismic section, fluid contents, impedance analysis
JURNAL SAINS DAN MATEMATIKA
2007-01-01 00:00:00
https://ejournal.undip.ac.id/index.php/sm/article/view/3260
JURNAL SAINS DAN MATEMATIKA; Volume 15 Issue 1 Year 2007
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/10481
2016-05-02T10:44:57Z
sm:Art
"151015 2015 eng "
0854-0675
dc
The Growth of Botryococcus braunii Microalgae as a Lipid Producer in a Mixed Medium of Coconut Water and Seawater
Saputro, Bintoro Rudi
Biology Department, Faculty of Sciences and Mathematics, Diponegoro University
Kusdiyantini, Endang
Biology Department, Faculty of Sciences and Mathematics, Diponegoro University
Kusumaningrum, Hermin Pancasakti
Biology Department, Faculty of Sciences and Mathematics, Diponegoro University
Energy needs in fuel sector tend to increase for supporting human life. Green microalgae (Chlorophyceae) can be used as an alternative solutions for bioenergy. Botryococcus braunii is lipid producer microalgae which can be processed further into biodiesel. Microalgae growth medium such as Walne can be substituted with coconut water that reducing economical cost. This research aims to determine the growth of B. braunii using coconut water and its effect on lipid production. The experiment conducted into five treatments of coconut water consist of P0 (0%), P1 (10%), P2 (7.5%), P3 (5%), and P4 (2.5%) for five days incubation and three repetitive step. Microalgae growth was calculated according to cell count using hemocytometer. The results showed that 2.5% coconut water substitution exhibited the best growth rate and lipid production, i.e. the amount of 547 cells / ml and produced lipid level according to these treatment increased 179% comparing with control.
JURNAL SAINS DAN MATEMATIKA
2016-05-02 10:45:02
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/10481
JURNAL SAINS DAN MATEMATIKA; Volume 23 Issue 4 Year 2015
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3281
2015-09-19T17:03:22Z
sm:Art
0854-0675
dc
KARAKTERISTIK PERBEDAAN ANTARA E-COMMERCE (EC) DENGAN E- GOVERNMENT (EG), DAN PENERAPAN PARADIGMA EC PADA EG DENGAN PENDEKATAN EMPIRIS
Widodo, Aris Puji
Undip
Istiyanto, Jazi Eko
UGM
ABSTRAKS---Lebih dari satu dekade bahwa aplikasi EC dan EG telah memberikan dampak besar pada
beberapa sektor, baik sektor swasta maupun masyarakat. Pemanfaatan Teknologi Informasi dan Komunikasi (TIK)
pada EC lebih berhasil dibandingkan dengan pemanfaatan TIK pada pemerintahan dalam hal ini EG. Keberhasilan
EC inilah yang akan digunakan oleh pemerintahan untuk menerapkan paradigm EC ke dalam EG, dengan
mengadopsi konsep, proses, dan teknologi yang diterapkan pada bisnis. Kajian ini dilakukan secara komperatif
terhadap dua fenomena EC dan EG. Pada makalah ini dibahas secara empiris mengenai karakteristik persamaan
dan perbedaan antara EC dan EG, serta paradigma kekuatan dan kelemahan pada EC untuk diterapkan pada EG.
Fenomena antara EC dan EG memiliki banyak persamaan, tetapi pada prinsipnya meliliki perbedaan secara
mendasar terkait mengenai peran bisnis dengan pemerintah.
Kata Kunci : E-Commerce, E-Government, Paradigma, Bisnis, dan Pemerintah
JURNAL SAINS DAN MATEMATIKA
2012-04-23 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3281
JURNAL SAINS DAN MATEMATIKA; Volume 17 Issue 3 Year 2009
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/6257
2015-09-30T13:19:38Z
sm:Art
"140226 2014 eng "
0854-0675
dc
STATUS TROFIK DANAU RAWAPENING DAN SOLUSI PENGELOLAANNYA
Soeprobowati, Tri Retnaningsih
Biology Department, Faculty of Sciences and Mathematics, Diponegoro University
Suedy, Sri Widodo Agung
Jurusan Biologi FMIPA Universitas Diponegoro Semarang
ABSTRACT---Eutrofikasi adalah pengkayaan perairan oleh unsur hara, khususnya nitrogen dan fosfor sehingga mengakibatkan pertumbuhan tidak terkontrol dari tumbuhan air. Berdasarkan kandungan unsur haranya, maka perairan dapat dikategorikan menjadi oligotrofik, mesotrofik dan eutrofik. Danau Rawapening menerima inlet dari 16 sungai dan hanya memiliki 1 outlet, menyebabkan akumulasi materi yang cukup tinggi. Penelitian ini bertujuan untuk mengkaji status trofik Danau Rawapening, sehingga dapat menjadi landasan dalam upaya pengembangan pengelolaannya. Pengambilan sampel air dilakukan pada Februari 2008 pada 7 titik untuk analisis fitoplankton dan kandungan total nitrogen, fosfor, silikon, potasium, kalsium dan mangaan. Pengukuran temperatur, DO, pH, kekeruhan, konduktivitas, turbiditas dilakukan secara in-situ. Pengambilan sampel air untuk analisis BOD dilakukan menggunakan 2 botol gelap 300mL, botol pertama diukur DO0, botol ke-2 diinkubasi selama 5 hari kemudian dihitung DO5.. Penghitungan kandungan klorofil menggunakan metode spektrofotometri. Berdasarkan kandungan klorofilnya, maka dapat dihitung nilai produktivitas primer. Berdasarkan kandungan Total Fosfor Danau Rawa Pening dalam kondisi mesotropik, tapi berdasarkan kandungan Total Nitrogen dankecerahan perairan yang kurang dari 2 meter termasuk dalam kondisi eutrofik. Hal ini ditunjukkan oleh dominannya Aulacoseira granulata dan Melosira varians. Kualitas air seperti pH, DO, kecerahan, kandungan logam berat mengalami degradasi dan cenderung melebihi ambang batas Baku Mutu Lingkungan. Ekoteknologi merupakan pendekatan yang dapat diimplementasikan di Danau Rawapening, menjadikan eceng gondok sebagai sabuk hijau, dan pembuatan preimpoundment di hilir inlet sebelum masuk ke danau.
Key words: status trofik, eutrofikasi, danau Rawapening, pengelolaan danau
JURNAL SAINS DAN MATEMATIKA
2014-02-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/6257
JURNAL SAINS DAN MATEMATIKA; Volume 18 Issue 4 Year 2010
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/7998
2015-09-30T13:14:43Z
sm:Art
"150107 2015 eng "
0854-0675
dc
Elektrodestruksi Zat Warna Remazol Black B dalam Limbah Artifisial dengan Elektroda Timbal Dioksida
Kristanto, Wahyu Adi
Jurusan Kimia FMIPA Universitas Diponegoro, Semarang
Widodo, Didik Setiyo
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Gunawan, Gunawan
Jurusan Kimia FMIPA Universitas Diponegoro, Semarang
Penelitian tentang destruksi larutan zat warna—remazol black B—dalam upaya penghilangan warna larutan limbah dengan metode elektrolisis menggunakan anoda timbal dioksida telah dilakukan. Remazol black B merupakan pewarna batik dan tekstil yang banyak digunakan pada proses perwarnaan. Pada proses produksi, zat warna ini terbuang ke lingkungan dan mencemari perairan, sehingga diperlukan upaya untuk memperbaiki lingkungan perairan. Pendekatan elektrokimia merupakan metode alternatif bagi upaya pemecahan masalah lingkungan yang tercemar zat warna seperti remazol blak B. Bahan elektroda merupakan faktor penting pada keberhasilan proses. Pemilihan timbal dioksida (dari aki) sebagai elektroda dilakukan dengan mempertimbangkan sifat bahan ini dalam sistem eletrolisis, stabil (inert) dan diharapkan memiliki efek katalisis dalam proses destruksi sehingga mengahsilkan sinergi pada upaya remediasi perairan tercemar dengan pendekatan elektrokimia. Penelitian ini bertujuan untuk menghasilkan larutan tak berwarna setelah perlakuan destruksi elektrokimiawi sampel yang mengandung remazol black B menggunakan elektroda PbO2. Metode ini dilakukan dengan mengelektrolisis larutan remazol black B sebanyak 50 mL dengan potensial 5,5 V selama 120 menit. Setelah elektrolisis larutan sampel dianalisis dengan spektrometri UV-Visibel. Untuk memperoleh data awal, elektrolisis dilakukan terhadap larutan sampel dengan variasi potensial aplikasi dan variasi waktu elektrolisis hingga 120 menit. Pada variasi waktu tersebut, dilakukan pencatatan arus yang mengalir dan pengujian tingkat pengurangan kepekatan zat warna dengan metode Spektrometri UV-Visibel. Sebagai pembanding dan untuk memperoleh daerah kerja dilakukan juga elektrolisis terhadap sistem pelarut. Data penelitian menunjukkan bahwa elektrolisis dengan penggunaan PbO2 sebagai anoda pada elektrodestruksi larutan remazol black B telah berhasil menurunkan intensitas zat warna tersebut hingga 99,69 %. Penurunan intensitas ini menunjukkan bahwa elektrodestruksi larutan zat warna remazol black B telah berlangsung. Perubahan intensitas warna ini disebabkan oleh proses destruksi oksidatif (elektrodestruksi) remazol black B menjadi molekul-molekul yang lebih sederhana, sehingga larutan menjadi tidak berwarna..
Keywords: elektrolisis, elektrodestruksi, remazol black B, elektroda PbO2, spektrometri UV-Visibel
JURNAL SAINS DAN MATEMATIKA
2014-03-24 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/7998
JURNAL SAINS DAN MATEMATIKA; Volume 20 Issue 1 Year 2012
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8025
2015-09-30T13:05:36Z
sm:Art
"150109 2015 eng "
0854-0675
dc
Biokonversi Jerami Padi Menjadi Gula Fermentasi Menggunakan Konsorsium Termofilik Kompos
Wahyuningsih, Melly
Department of Chemistry, Faculty of Science and Mathematics,
Diponegoro University, Semarang, Indonesia
Sarjono, Purbowatiningrum Ria
Biochemistry Laboratory, Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Aminin, Agustina L. N.
Biochemistry Laboratory, Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Penelitian melaporkan degradasi jerami padi dalam memproduksi gula pereduksi menggunakan konsorsium mikroba kompos fase termofilik dan kompleks ekstraseluler lignoselulolitik. Penelitian ini bertujuan memperoleh data sistem fermentasi paling efektif dalam mendegradasi jerami padi untuk menghasilkan gula pereduksi menggunakan kompos fase termofilik pada suhu 50°C selama 48 jam dari sistem fermentasi cair, semipadat, dan padat, memperoleh data kadar gula pereduksi tertinggi hasil degradasi jerami padi menggunakan kompos fase termofilik pada suhu 50°C selama 48 jam, memperoleh data aktivitas dan keragaman kompleks lignoselulolitik hasil fermentasi jerami padi yang diuji terhadap substrat CMC, xilan, dan jerami padi. Metode yang dilakukan adalah penentuan sistem fermentasi jerami padi (sistem cair, semipadat, dan padat), penentuan waktu optimum degradasi jerami padi dilihat dari profil kadar gula pereduksi, isolasi kompleks enzim lignoselulolitik, dan uji aktivitas kompleks enzim lignoselulolitik terhadap CMC, xilan, dan jerami padi. Hasil penelitian menunjukkan bahwa sistem fermentasi padat lebih baik dibanding sistem fermentasi cair maupun semipadat dalam menghasilkan gula pereduksi. Kadar gula pereduksi tertinggi dihasilkan pada jam ke-32 sebesar 0,624 mg/mL dan kompleks enzim lignoselulolitik mengandung selulase, xilanase, dan enzim-enzim pendegradasi lignin.
Kata kunci: jerami padi, kompos termofilik, kompleks lignoselulolitik
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8025
JURNAL SAINS DAN MATEMATIKA; Volume 21 Issue 1 Year 2013
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8052
2015-09-21T08:52:12Z
sm:Art
"150112 2015 eng "
0854-0675
dc
Efek Hidrolisis Ekstrak Daun Iler (Coleus scutellarioides) Terhadap Aktivitas Inhibisi Enzim α-glukosidase
Auliawan, Riky
Laboratorium Kimia Organik, Jurusan Kimia FSM, Universitas Diponegoro
Jl. Prof. Sudharto SH, Kampus Tembalang, Semarang 50275 (Telp/Fax 024-76480824)
Cahyono, Bambang
Organic Chemistry Laboratory, Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University, Semarang Jalan Prof. Soedarto, Tembalang, Semarang 50275, Telepon +62-24-7474754
Penemuan antidiabet dari suatu senyawa bioaktif atau ekstrak tanaman banyak diarahkan pada mekanisme penghambatan hidrolisis ikatan glikosidis, dan umumnya tertuju pada senyawa fenolik. Tanaman iler (Coleus scutellarioides), yang secara tradisional telah digunakan untuk antidiabetes, dilaporkan mengandung senyawa dari golongan tersebut. Penelitian yang bertujuan membandingkan aktivitas dari ekstrak daun iler dan ekstrak yang terhidrolisis telah dilakukan dalam riset ini. Penyediaan ekstrak dilakukan melalui maserasi dalam pelarut etanol, dan hidrolisis ekstrak dilakukan dalam suasana asam (HCl 2N). Ekstrak dan hasil hidrolisis dianalisis fenolat total dan aktivitas penghambatan enzim alfa-glukosidase. Hasil penelitian menunjukkan bahwa ekstrak etanolat daun iler dapat diperoleh dengan rendemen 4,50%. Adanya peningkatan kadar fenolat total rata-rata dari ekstrak setelah dihidrolisis sebesar 23,99 mg GAE/g bobot sampel kering (dari 156,38±0,25 menjadi 180,37±0,260 dapat mengindikasikan bahwa ikatan glikosida pada ekstrak asal telah terhidrolisis oleh HCl. Uji aktivitas penghambatan a-glukosidase terhadap sampel sebelum dan sesudah hidrolisis menunjukkan harga IC50 sebesar 735,67±11,51µg/mL dan 724,33±8,60µg/mL. Secara statistik, nilai aktivitas kedua bahan ini tidak berbeda secara signifikan. Hasil penelitian ini dapat membuktikan bahwa ikatan glikosida dalam senyawa organik ekstrak daun iler tidak memberikan efek terhadap peningkatan aktivitas penghambatan enzim glukosidase.
Kata kunci: Coleus scutellarioides, daun iler, fenolat total, enzim α-glukosidase, hidrolisis ekstrak
The studies of antidiabetic activity of a bioactive compound or plant extract have been directed into the inhibition mechanism of glycoside bond hydrolyses, and generally focused on phenolic compounds. Iler plants (Coleus Scuterllariousdes) that traditionally used as antidiabetic, has been reported containing those compounds. Aim of this study is comparing the activity of Iler leaves extract and their hydrolyzed extracts. The extracts were prepared by ethanol maceration and acid hydrolysis (HCl 2N). Both ethanol and hydrolyzed extracts were analyzed for total phenolic and alpha-glucosidase inhibitory activity. The result showed that the extract yield was 4.50%. The increasing number of total phenolic content after hydrolysis (23.99 mg GAE/g weight of dry samples) indicated that the glycoside bonds in extracts have been hydrolized by HCl. The alpha-glucosidase inhibitory (IC50) of ethanol and hydrolyzed extracts were 735.67±11.51µg/mL dan 724.33±8.60µg/mL respectively. Statistically, the differences of inhibitory activity of both extracts was not significant. This result proved that the glycoside bond in Iler leaves extract does not enhance the inhibition activity of glucosidase enzyme.
Key-words : Coleus scutellarioides, total phenolics, α-glucosidase enzyme, extract hydrolysis
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8052
JURNAL SAINS DAN MATEMATIKA; Volume 22 Issue 1 Year 2014
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/2850
2015-09-30T13:21:38Z
sm:Art
0854-0675
dc
KOMUNITAS DIATOM PADA EKOSISTEM MANGROVE PANTAI UTARA JAWA TENGAH
R. Soeprobowati, Tri Retnaningsih
Biology Department, Faculty of Sciences and Mathematics, Diponegoro University
W.A. Suedy, Sri
Universitas Diponegoro
Diatom is a unique microalgae, undoubtly good bioindicator of water quality, andable to be usedf or paleoreconstructione nvironmentacl hangesI.t s relatedt o the silicious frustule,t hat remainpreserved in the sediment. Diatom have widespread distribution, including in the mangrove ecosystem.Mangrove€ cosystema lso unique, influenceb y freshwatera nd salinew ater, therefore,t he biodiversity in themangrovee cosystema re very high. However,t he sharpd egradationo f mangrovee cosystemin the NorthernCoast of Central might reduce the biodiversity, particularly diatom. This research is conducted in order tostudy the diatom community vertically in the Norther Coast of Central Java and their correlation with waterquallty. From 54 sediments amples, 147 diatoms speciesw are identified, 10.88% of Centrophycidaea nd89.12o/o of PennatophycidaeP. lanktonic and benthonic ( epifitic, epilitic and epipelic) diatoms werecomposed iatoms community in the mangrovee cosystemF. reshwaterd iatom have an important role in themangreovee cosystemi,n dicatedb y the dominanceo f freshwaterd iatOmsin all sites.
permalink : http://ejournal.undip.ac.id/index.php/sm/article/view/2850
JURNAL SAINS DAN MATEMATIKA
2010-07-03 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/2850
JURNAL SAINS DAN MATEMATIKA; Volume 18 Issue 3 Year 2010
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8022
2018-08-21T07:16:43Z
sm:Art
"150109 2015 eng "
0854-0675
dc
Analisis Perubahan Kurva Percentage Depth Dose (PDD) dan Dose Profile untuk Radiasi Foton 6MV pada Fantom Thoraks
Prasetyo, Nur Dwi
Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro, Semarang, Jawa Tengah
Setiabudi, Wahyu
Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro, Semarang, Jawa Tengah
Anam, Choirul
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
The study of thickness variation of the soft tissue in the wall of thoracic phantom to the shifting of Percentage Depht Dose (PDD) curve and Dose Profile have been done by using Monte Carlo Simulation. The linac head was designed using BEAMnrc software, whereas modeling of water and thoracic phantom using DOSXYZnrc software. The field size of beam radiation 10 x10 cm2 and the distance of source to phantom surface (SSD) 100 cm. The water phantom in cubic shape with a size 40x40x40 cm3. The thoracic phantom was designed in cubic shape, with the compositions: soft tissue, bone and lung. The thickness of the soft tissue in the wall of throcic phantom was varied 1-5 cm. This variation shows the thickness layer of the wall of the real patients. The results of comparation between monte carlo simulation and the actual measurement, show that 6 MV photon delivered by linac at Kensaras Hospital Semarang was generated using energy electron about 5.7 MeV. The variation of soft tissue thickness change the PDD curve and the dose profile curve. The variation of soft tissue thickness change the dose in the lung (depth 10 cm) at about 3,84% - 5,59%
Keywords: Monte Carlo Simulation, Percentage Depht Dose (PDD), Dose profle, Tissue inhomogeneity
Telah dilakukan studi pengaruh ketebalan jaringanlunak pada fantom thoraks terhadap perubahan bentuk kurva Percentage Depht Dose (PDD) dan Dose Profile untuk berkas foton energi 6MV menggunakan Simulasi Monte Carlo. Pembuatan model treatment head linac dilakukan menggunakan program BEAMnrc, sedang permodelan fantom air maupun fantom thoraks menggunakan DOSXYZnrc. Luas lapangan yang digunakan 10x10 cm2, dengan source to skin distance (SSD) sebesar 100 cm. Fantom air didesain berukuran 40x40x40 cm3. Fantom thoraks didesain berbentuk kubus dengan komposisi jaringan lunak, tulang, dan paru-paru. Jaringan lunak bagian depan (asterior) divariasi ketebalannya 1-5 cm. Variasi ini menggambarkan ketebalan jaringan lunak dinding thoraks pasien. Hasil perbandingan antara simulasi dan pengukuran menunjukan bahwa foton 6 MV yang dihasilkan pesawat linac RS Kensaras Semarang menggunakan energi elektron pembangkit mendekati 5,7 MeV. Variasi ketebalan jaringan lunak pada dinding fantom thoraks memberikan perubahan kurva PDD dan juga kurva profil dosis. Variasi ketebalan jaringan lunak tersebut mengubah besarnya dosis pada paru-paru (pada kedalaman 10 cm) sebesar 3,84% - 5,59%
Kata kunci : Simulasi Monte Carlo, Percentage Depht Dose (PDD), Dose Profile, Inhomogenitas Jaringan.
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8022
JURNAL SAINS DAN MATEMATIKA; Volume 20 Issue 4 Year 2012
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3138
2015-09-19T17:06:42Z
sm:Art
0854-0675
dc
MIX CULTURE INOCULANT PRODUCTION OF PHOSPHATE SOLUBILYZING AND INDOLE ACETIC ACID (IAA) PRODUCER RHIZOBACTERIA WITH AMBARAWA PEAT SOIL RAWAPENING AS CARRIER
Raharjo, Budi
Universitas Diponegoro
Suprihadi, Agung
Universitas Diponegoro
ABSTRACT---Plant production development is the main goals that do for increase the farming quality to fulfill the man needed in food. One of the ways is intensive farming, by using organic or inorganic fertilizer. Phosphate is the essential for plants. IAA is the necessary plant regulator for the root. Both phosphate and IAA need in plant growing and production. Biological fertilizer is fertilizer with microbial as the main material. Bacillus sp.DUCC-BR-K1.7, Bacillus sp. DUCC-BR-KI3, Bacillus sp.DUCC-BR-KI.2b and Pseudomonas fluorescens, Azotobacter chroococcum, Azotobqcter vinelandii, Azospirillum sp. and Azotobacter brazilensis are bacteria that can solubilization the phosphate and IAA synthesize. Those bacteria can be used as inoculants or biological fertilizer that put on carrier. One way to support the aim is giving the altemative carrier with suitable composition. The carrier should be support bacterial life during the storage. The aim ofthis research is find ths right consortia so can be used to optimized viabilities of culture Bacillus sp. DUCC-BR-KIJ, Bacillus sp. DUCC-BR-K1.3, Bacillus sp. DUCC-BR-KI.2b, P. flourescens, A. chroococcum, A. vinelandii, Azospirillum sp., and A. brazilensis in mix culture on peat soil as carrier. This research done in Microbiology Laboratory of Biology Department Diponegoro University. Subculture and activated culture in Nutrient Broth medium, make the growth curve to the biomass production, make the inoculums, prepare the peat soil, biomass production and mixed biomass with the carrier, enumeration bacterial culture viability test in carrier during the storage by TPC method. The results show that all consortia culture bacteria viabiliry Bacillus sp. DUCC-BR-KI.3 with Azospirillum (A) and Bacillus sp. DUCC-BR-K1.7, with P. flourescens (B) still viable and increasing number of population during seven weeks storage with l0 t-n CFU/g at To and up to l0 r3-ro CFU/g at the end storage. The consortium C between Bacillus sp. DUCC-BR-KI.2 b and A- brssilensis increasing the number of population and still viable during eight weeks storage (1013 - 1014 CFU/g).
Key words: biofertilizer, peat soil, viability, mix cultare, consortium
Permalink : http://ejournal.undip.ac.id/index.php/sm/article/view/3138
JURNAL SAINS DAN MATEMATIKA
2010-04-02 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3138
JURNAL SAINS DAN MATEMATIKA; Volume 18 Issue 2 Year 2010
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/9002
2015-09-30T15:45:53Z
sm:Art
"140715 2014 eng "
0854-0675
dc
Evaluation of Cytotoxicity Effect of Hyptis pectinata Poit (Lamiaceae) extracts using BSLT and MTT methods
Suzery, Meiny
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Cahyono, Bambang
Organic Chemistry Laboratory, Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University, Semarang Jalan Prof. Soedarto, Tembalang, Semarang 50275, Telepon +62-24-7474754
Hyptis pectinata (Lamiaceae) is a traditional medicinal plants to treat conditions associated with malignant disease. In Indonesia, this plant has not been utilized yet, just as a wild plant. This study aimed to evaluate the anticancer activity of Hyptis pectinata poit extracts which are more beneficial. Methanol extract and various fractions solvents (hexane, dichloromethane, ethyl acetate) were examined their toxicities to shrimp larvae Artemia salina Leach using BSLT method and their anticancer activity in vitro on cells MCF-7 breast cancer using MTT assay method. The toxicity test on shrimp larvae Artemia salina Leach, methanol extracts have LC50: 185.63 µg/mL and fractions of hexane, dichloromethane and ethylacetate were obtained at 128.45; 113.32 and 92.54 µg/mL successively. Whereas the cytotoxicity test on breast cancer cells MCF-7 resulted that methanol extract Hyptis pectinata poit obtained at IC50: 18.90 μg/mL. Hyptis pectinata poit extract showed good cytotoxic and anticancer activity hence it has a chance to be developed to as anticancer drugs.
JURNAL SAINS DAN MATEMATIKA
2014-07-15 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/9002
JURNAL SAINS DAN MATEMATIKA; Volume 22 Issue 3 Year 2014
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3255
2015-09-19T17:08:06Z
sm:Art
0854-0675
dc
Kerapatan Jenis Lichenes Di Sekitar Kawah Sikidang Pegunungan Dieng (Density of Lichens Arround Sikidang Creater of Dieng Plateau)
Widodo, Edy
UNDIP
Utami, Sri
UNDIP
ABSTRACT---Lichens are symbiotic plant composed of two different types of organisms i.e. fungi and algae. Lichens sensitive to air pollutan of sulfur dioxide (SO2). Sikidang creater are still active to emist off SO2 and will be affected the availability of lichens as well as the their individual density along SO2 gradient. Sampling of lichens taken with sistematic method. Point sampling four were taken along transect line and sample plot 5 m x 5 m in size was applied..The occurance of species and density was record in every sampling plot. The environment factor measured were air SO2, pH, moisturized and air temperature. There were three species of lichens in Sikidang Creater, those are Cladonia beaumontii, Dactylina artica abd Parmelia cumberlandia. The highets density of species lichens is Cladonia beaumontii.
Keywords : density, Lichens. Sikidang Creater
JURNAL SAINS DAN MATEMATIKA
2007-01-01 00:00:00
https://ejournal.undip.ac.id/index.php/sm/article/view/3255
JURNAL SAINS DAN MATEMATIKA; Volume 15 Issue 1 Year 2007
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/9272
2015-10-14T09:33:37Z
sm:Art
"150715 2015 eng "
0854-0675
dc
Correction of 2D Isodose Curve on the Sloping Surface using Tissue Air Ratio (TAR) Method
Nuzula, Nurul Firdausi
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Adi, Kusworo
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Anam, Choirul
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
The curve of 2D isodose is used to determine the dose distribution in patient treated by radiotherapy. Therefore, isodose curve is very useful for planning and evaluating of the dose received by the patient. Correction of 2D isodose curve for sloping surface is very important due to the skin of patient is not flat. In this study, the correction of isodose curve was calculated using tissue air ratio (TAR) method for radiation field size of 10x10 cm2. The correction factor was obtained by comparison of TAR value for effective depth and TAR value for total depth. The correction factor then was multiplied to isodose curve for flat surface. In this study, the software for calculating the automated correction factor due to sloping of patient surface has been successfully developed. It was found that if the sloping of patient surface increases then the corrected isodose curve increases.
Key wods: 2D isodose curve, tissue air ratio (TAR), correction factor, sloping patient surface.
JURNAL SAINS DAN MATEMATIKA
2015-10-14 09:33:37
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/9272
JURNAL SAINS DAN MATEMATIKA; Volume 23 Issue 3 Year 2015
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3276
2015-09-19T17:10:49Z
sm:Art
0854-0675
dc
DETEKSI DAN KOREKSI ERROR PADA PESAN DIGITAL DENGAN KODE HAMMING
Irawanto, Bambang
Undip
Widyaningsih, Santi
Undip
ABSTRACT--At digital message delivery process in the form of code may will experience of trouble in couse of its transmission so that generate the error of accepted message. Hamming Code (n,k,d) is one of method that coald detect error and correct error that happened at one blow. Coding process of message by Hamming Code (n,k,d) can be done by multiply of message word delivered with the generator matrix G. Then for the Coding process of codewords accepted can be done with method of vector error, the method started by determined the syndrome, and continued with the error detrection process and also error correetion process. The final step is read the codeword by multiply codeword accepted with parity check matrix H toget the message such as those which transmissionfrom the beginning.
Keyword: Hamming Code (n,k,d), generator matrix, the parity check matrix, syndrome, error correcting code
JURNAL SAINS DAN MATEMATIKA
2012-04-23 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3276
JURNAL SAINS DAN MATEMATIKA; Volume 17 Issue 3 Year 2009
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/6252
2015-09-19T17:00:35Z
sm:Art
"140226 2014 eng "
0854-0675
dc
PENGARUH PELARUT METANOL DAN PELARUT METANOL-ASAM ASETAT-AIR TERHADAP EFISIENSI DYE SENSITIZED SOLAR CELL DARI EKSTRAK BUNGA ROSELA (Hibiscus sabdariffa)
Dewi, Prestysiana Ariane
Jurusan Kimia Fakultas MIPA Universitas Diponegoro
Gunawan, Gunawan
Jurusan Kimia Fakultas MIPA Universitas Diponegoro
Haris, Abdul
Jurusan Kimia Fakultas MIPA Universitas Diponegoro
ABSTRAK---Telah dilakukan penelitian tentang pengaruh pelarut metanol dan pelarut metanolasamasetat-air terhadap efisiensi Dye Sensitized Solar Cell dengan menggunakan bunga rosela (Hibiscussabdariffa) sebagai sensitizer. Konstruksi sel surya yang digunakan adalah sistem sandwich. Elektrodaperlawanan diletakkan di atas lapisan TiO2 dengan elektrolit padat berbasis gel polimer PEG terletak diantara kedua elektroda tersebut. Karakterisasi sel surya dilakukan dengan analisis serapan elektronik padabunga rosela, Scanning Electron Microscopy (SEM), difraksi sinar X, dan pengukuran arus-tegangan selsurya. Panjang gelombang maksimum ekstrak bunga rosela dari hasil maserasi dengan pelarut metanolsebesar 508,5 nm sedangkan untuk ekstrak rosela hasil maserasi dengan pelarut campuran metanol-asamasetat-air sebesar 524,5 nm. Morfologi permukaan TiO2 pada perbesaran 10000x menunjukkan permukaanTiO2 yang beronggga-rongga dengan ukuran berkisar 69,56-347,82 nm, dan penampang lintangmenunjukkan ketebalan 39,05 μm. Pada difraktrogram lapis tipis TiO2 menunjukkan intensitas pola difraksicukup tinggi dengan puncak utama pada 2 yaitu 29,57 dengan jarak antar bidang (d) sebesar 3,5074 Å. Efisiensi yang dihasilkan untuk sistem sel surya dengan menggunakan dye hasil maserasi dengan pelarutmetanol lebih besar sebesar 4,65.10-4 %, dan untuk sistem sel surya dengan menggunakan dye hasil maserasidengan pelarut metanol-asam asetat-air sebesar 3,58.10-4 %.
ABSTRACT---Research on The influence of methanol and methanol-acetic acid-water solvents onefficiency of Dye Sensitized Solar Cell using rosella flower (Hibiscus sabdariffa) as sensitizer has been done.Construction of solar cell used was a sandwich system. Counter electrode was placed in the top layer of TiO2with gel-based solid polymer electrolyte PEG lied between these two electrodes. Solar cell characterizationhas been evaluated with UV-Vis spectrometer in rosella flower, Scanning Electron Microscopy (SEM), X-raydiffraction, and the measurement of current-voltage solar cell. The maximum wavelength of rosella flower’sextracts by maceration with methanol was at 508,5 nm while for the rosella’s extract by maceration withsolvent mixture of methanol-acetic acid-water was at 524,5 nm. Surface morphology of TiO2 at 10000xmagnification shows the surface of TiO2 cavities with the size range of 69,56-347,82 nm, and cross sectionshowing the thickness of 39,05 μm. In the thin layer of TiO2 diffractogram shows high intensity diffractionpattern with main peaks at 2 of 29,57 with a plane spacing (d) of 3,5074 Å. Efficiency for solar cell usingdye with methanol more bigger are 4,65.10-4 % than solar cell using dye with methanol-acetic acid-water are3,58.10-4 %.
Key words: Dye Sensitized Solar Cell, TiO2, rosella flower, methanol solvent, methanol-acetic acid-watersolvents
JURNAL SAINS DAN MATEMATIKA
2014-02-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/6252
JURNAL SAINS DAN MATEMATIKA; Volume 18 Issue 4 Year 2010
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/7911
2015-09-30T15:58:05Z
sm:Art
"141223 2014 eng "
0854-0675
dc
Verifikasi Kepemilikan Citra Medis dengan Kriptografi RSA dan LSB Watermarking
Putra, Satya Sandika
Jurusan Matematika Fakultas Sains dan Matematika Universitas Diponegoro
Sasongko, Priyo Sidik
Jurusan Ilmu Komputer / Informatika Fakultas Sains dan Matematika Universitas Diponegoro
Bahtiar, Nurdin
Informatics Department, Faculty of Sciences and Mathematics, Diponegoro University
Di dalam dunia medis, penyembunyian informasi untuk perlindungan hak cipta sangat diperlukan. Teknik penyembunyian informasi biasa disebut dengan watermarking. Metode yang digunakan adalah dengan menyisipkan pesan teks ke dalam sebuah data citra medis. Perlindungan informasi di dalam data citra medis seorang pasien perlu dilakukan agar tidak terjadi kesalahan informasi kepemelikan data medis pasien satu dengan yang lainnya. Informasi yang disembunyikan di dalam citra medis berupa teks yang sebelumnya telah dilakukan enkripsi atau pengacakan pesan. Salah satu metode untuk menyembunyikan pesan teks adalah dengan memanfaatkan Least Significant Bit (LSB), yaitu dengan mengubah nilai bit terakhir pada citra medis. Karena hanya bit-bit terakhir yang diubah, maka citra medis yang telah tersisipi pesan sangat miripdengan citra aslinya, perubahan nilai-nilai piksel pada citra medis tidak begitu terlihat. Untuk mengekstrak kembali pesan teks yang disisipkan menggunakan private key (kunci rahasia) yang sebelumnya telah ditentukan secara acak. Citra medis dan pesan teks hasil ekstrak sama dengan citra medis dan pesan teks sebelum dilakukan penyisipan.
Kata kunci : watermarking, citra medis, enkripsi, private key, Least Significant Bit
JURNAL SAINS DAN MATEMATIKA
2014-03-14 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/7911
JURNAL SAINS DAN MATEMATIKA; Volume 19 Issue 3 Year 2011
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8016
2015-09-21T20:59:19Z
sm:Art
"150108 2015 eng "
0854-0675
dc
Isolasi, Karakterisasi dan Uji Aktivitas Antioksidan Flavonoid dari Ekstrak Air Kulit Batang Ketapang Kencana (Terminalia muelleri Benth.)
Yuniati, Wiwit Wulan
Jurusan Kimia FMIPA, Universitas Diponegoro, Semarang, Indonesia
Anam, Khairul
Organic Chemistry Laboratory, Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Kusrini, Dewi
Jurusan Kimia FMIPA, Universitas Diponegoro, Semarang, Indonesia
Telah diisolasi, karakterisasi dan uji aktivitas antioksidan senyawa flavonoid dari ekstrak air kulit batang tumbuhan Ketapang Kencana (Terminalia muelleri Benth.). Identifikasi jenis flavonoid dilakukan dalam lima tahap, tahap pertama adalah preparasi serta ekstraksi sampel menggunakan metode infudasi, tahap kedua, penapisan fitokimia serbuk ekstrak air, tahap ketiga, isolasi senyawa flavonoid meliputi pemisahan menggunakan kromatografi kolom, hidrolisis asam dan ekstraksi fraksi serta uji kemurnian isolat, tahap keempat, karakterisasi dan elusidasi isolat murni flavonoid hasil isolasi secara spektroskopi menggunakan spektrometer Infra merah (IR), spektrofotometer UV-Vis dengan penambahan pereaksi geser, spektrometer 1H-NMR serta 13C-NMR dan tahap kelima yaitu uji aktivitas antioksidan isolat menggunakan metode DPPH. Isolat berupa serbuk kuning dengan rendemen 0,2% dan memiliki titik lebur 306-307,5 oC. Karakterisasi secara spektrometri menunjukkan bahwa isolat adalah Kuersetin. Uji aktivitas antioksidan isolat kuersetin memiliki nilai (IC50) 257,23 ppm.
Keywords: Terminalia muelleri Benth., flavonoid, kuersetin, DPPH
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8016
JURNAL SAINS DAN MATEMATIKA; Volume 20 Issue 3 Year 2012
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8046
2015-09-19T16:48:33Z
sm:Art
"150112 2015 eng "
0854-0675
dc
Pembentukan Bintil Akar Tanaman Kedelai (Glycine max (L) Merrill) dengan Perlakuan Jerami pada Masa Inkubasi yang Berbeda
Kumalasari, Ika Dyah
Laboratorium Biologi Struktur dan Fungsi Tumbuhan
Jurusan Biologi Fakultas Sains dan Matematika UNDIP
Astuti, Endah Dwi
Laboratorium Biologi Struktur dan Fungsi Tumbuhan
Jurusan Biologi Fakultas Sains dan Matematika UNDIP
Prihastanti, Erma
Laboratorium Biologi Struktur dan Fungsi Tumbuhan
Jurusan Biologi Fakultas Sains dan Matematika UNDIP
Tanaman kedelai (Glycine max (L) Merrill) merupakan tanaman yang sudah dikenal masyarakat dan memilik potensi besar untuk dikembangkan. Tanaman kedelai termasuk tanaman legum yang pada akarnya terdapat bintil akar yang merupakan simbiosis antara akar dengan bakteri Rhizobium japonicum. Bintil akar berfungsi untuk mengikat unsur nitrogen bebas. Selain itu juga dapat menyuburkan tanah karena dapat menghemat penggunaan Nh3 yang tersedia ditanah dan penyediaan unsur nitrogen ke tanah. Tanaman kedelai agar tumbuh subur dan kaya bahan organik. Bahan organik yang digunakan dalam penelitian ini adalah jeramipadi yang merupakan limbah organik yang mempunyai rasio C/N tinggi. Jerami padi mengandung gula, pati, selulose, hemiselulose, pektin, lignin, lemak dan protein. Jerami padi jumlahnya melimpah dan biasanya dibakar dan dibenamkan kedalam sawahdan terjadi dekomposisi. Selama proses dekomposisi terjadi aminasi, amonifikasi, dan nitrifikasi. Petani biasanya menanam kedelai setelah ditanami padi sebelum kemudian ditanami padi lagi tapi belum diketahui berapa lama inkubasi jerami padi berpengaruh menguntungkan dalam pembentukan bintil akar tanaman kedelai. Diharapkan dengan masa inkubasi yang berbeda dapat diketahui tingkat dekomposisi jerami padi yang berpengaruh terhadap pembentukan bintil akar.
Tujuan dari penelitian ini adalah untuk mengetahui pengaruh pemberian jerami padi pada masa inkubasi yang berbeda pada pembentukan bintil akar tanaman kedelai (Glycine max (L) Merrill) dan masa inkubasi jeramiyang berpengaruh paling baik terhadap pembentukan bintil akar tanaman kedelai.
Rancangan yang digunakan adalah RAL dengan faktor tunggal dengan perlakuan P1=jerami padi masa inkubasi 15hari, P2=jerami padi pada masa inkubasi 30 hari, P3=jerami padi pada masa inkubasi 45 hari, P0=jerami padi masa inkubasi 15hari (sebagai kontrol). Masing-masing perlakuan dengan 4 ulangan. Parameter yang diamati adalah jumlah bintil akar, persentase bintil akar, berat basah bintil akar dan berat kering bintil akar. Data yang diperoleh dianalisi dengan ANOVA pada taraf uji 5% dan bila terdapat beda nyata dilanjutkan dengan uji Duncan pada taraf uji 5%.
Hasil penelitian ini menunjukkan bahwa jerami padi tanpa inkubasi (kontrol) dapat meningkatkan pembentukan bintil akar. Semakin lama masa inkubasi maka semakin menurunkan pembentukan bintil akar tanaman kedelai.
Keywords: Glycine max (L) Merrill, bintil akar, dekomposisi, jerami padi
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8046
JURNAL SAINS DAN MATEMATIKA; Volume 21 Issue 4 Year 2013
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/7903
2015-09-19T16:58:55Z
sm:Art
"141219 2014 eng "
0854-0675
dc
Analisis Produktivitas Itik Petelur di Kabupaten Semarang Berdasarkan Indikator Nilai Konversi Pakan, Rasio Tingkat Konsumsi Pakan dengan Intestinum dan Bobot Intestinum dengan Pertambahan Bobot Badan
Sunarno, Sunarno
Laboratorium Biologi Struktur dan Fungsi Hewan, Jurusan Biologi, FSM, Universitas Diponegoro
Djaelani, M. Anwar
Laboratorium Biologi Struktur dan Fungsi Hewan, Jurusan Biologi, FSM, Universitas Diponegoro
Kabupaten Semarang merupakan salah satu kabupaten di Jawa Tengah dengan jumlah peternak itik petelur lokal cukup banyak. Berbagai itik lokal dibudidayakan oleh masyarakat setempat, antara lain itik Pengging, Magelang, dan Tegal. Selain letaknya yang strategis, wilayah ini memiliki kondisi mikroklimat yang menunjang kegiatan budidaya itik petelur. Mikroklimat merupakan salah satu faktor penting yang berpengaruh pada produktivitas itik petelur. Penelitian ini bertujuan menganalisis produktivitas itik petelur lokal di Kabupaten Semarang dengan menggunakan beberapa indikator penting, yang meliputi konversi pakan (KP), rasio antara pakan dengan bobot intestinum (BK:BI), dan rasio antara bobot intestinum dengan bobot badan (BI:BB). Metode yang digunakan adalah sampling sederhana dengan cara memilih ketiga jenis itik petelur lokal yang berumur 6 bulan (itik siap bertelur), antara lain itik Pengging, Magelang, dan Tegal, masing-masing sebanyak 6x ulangan. Pengukuran bobot pakan dilakukan setiap hari dengan menggunakan timbangan digital. Bobot badan diukur setiap 5 hari sekali selama satu bulan, sedangkan bobot intestinum diukur pada akhir bulan. Hasil penelitian menunjukkan bahwa itik petelur Pengging memiliki nilai KP 98,04, BK:BI = 2,17, dan BI:BB = 0,05, sedangkan itik Magelang dan Tegal, berturut-turut (134,08; 4,08; 0,03) dan (101,35; 2,57; 0,04). Kesimpulan penelitian ini adalah bahwa itik Pengging memiliki kemampuan konversi pakan, rasio bobot pakan dengan bobot intestinum, dan rasio bobot intestinum dengan bobot badan yang lebih baik dibanding itik Magelang dan Tegal. Berdasarkan indikator tersebut, itik Pengging lebih produktif dibanding itik Magelang dan Tegal dan direkomendasikan untuk dibudidayakan, terutama di daerah yang memiliki karakteristik mikroklimat seperti yang ada di Kabupaten Semarang.
Keywords: itik petelur, produktivitas, konversi pakan, intestinum, bobot badan
JURNAL SAINS DAN MATEMATIKA
2014-03-11 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/7903
JURNAL SAINS DAN MATEMATIKA; Volume 19 Issue 2 Year 2011
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3115
2015-10-14T09:01:21Z
sm:Art
0854-0675
dc
ANALYSIS OF ALKALINE AND ALKALINE EARTH METALS IN STANDARD SAMPLES BY LIQUID ELECTRODE PLASMA OPTICAL EMISSION SPECTROMETER
Hidayanto, Eko
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Yamamoto, Takashi
Kyoto University, Japan
Kawai, Jun
Kyoto Univesity, Japan
ABSTRACT---Sodium, potassium and calcium in standard sample solution were analyzed with a portable analyzer of liquid electrode plasma optical emission spectrometer (LEP-OES) to assess its validity for quantitative analysis. Reproducibility and sensitivity were investigated using different disposal sample chip and applied voltage. ln the applied voltage of 800 V, there is no increasing period of emission intensity by consecutive measuremenl and the relative standard deviation among chips was less than 20%. The sensitivity of emission intensity for Na and K were proportional to the applied voltage, but Ca was
exponential. The sensitivity was different by kinds of element and applied voltage. According to its reproducibility, the spectrometer would be used for quantitative analysis.
Permalink : http://ejournal.undip.ac.id/index.php/sm/article/view/3115
JURNAL SAINS DAN MATEMATIKA
2010-01-01 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3115
JURNAL SAINS DAN MATEMATIKA; Volume 18 Issue 1 Year 2010
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8050
2015-09-19T10:56:01Z
sm:Art
"150112 2015 eng "
0854-0675
dc
Perhitungan Medan Listrik dan Rapat Arus pada Plasma Lucutan Korona dengan Konfigurasi Jarum–Cincin
Sutanti, Ratna Wulan
Devisi Aplikasi Plasma, Laboratorium Fisika Atom dan Nuklir Jurusan Fisika, Universitas Diponegoro
Wardaya, Asep Yoyo
Devisi Aplikasi Plasma, Laboratorium Fisika Atom dan Nuklir Jurusan Fisika, Universitas Diponegoro
Nur, Muhammad
Devisi Aplikasi Plasma, Laboratorium Fisika Atom dan Nuklir Jurusan Fisika, Universitas Diponegoro
This paper presents analytical method for the calculations of the electric field and current density in needle-ring configurations of the corona discharge plasma. The needle is considered hyperboloidal. The result of the calculation indicates that the strong electric field generated by the sharp needle due to the unsymmetrical of geometric form of it. Similarly, the current density at the tip of the sharp needle is higher than at the ring. The value of the electric field and current density depends on geometric form, especially radius of the hyperbola, radius of the ring, and the distance between the electrodes. Radius of the hyperbola must be smaller than radius of the ring.
Keywords : electric field, current density, needle-ring configurations, geometric form
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8050
JURNAL SAINS DAN MATEMATIKA; Volume 22 Issue 1 Year 2014
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3228
2015-09-30T15:55:58Z
sm:Art
0854-0675
dc
MODEL DINAMIK PENULARAN HUMAN IMMUNODEFICIENCY VIRUS (HIV)
Sutimin, Sutimin
Mathematics Department, Faculty of Sciences and Mathematics, Diponegoro University
Imamudin, Imamudin
Universitas Dipoegoro
ABSTRAK-Human Immunodeficiency Virus (HIV) adalah virus yang dapat merusak sistem kekebalan tubuh manusia Virus HIV dapat menyerang orang yang rentan ketika orang yang rentan itu melakukan kontak dengan penderita virus HIV hingga terinfeksi virus HIV pada akhirnya dapat menderita AIDS atau seropositif non-AIDS. Dengan asumsi-asumsi tentang penularan virus HIV dapat diformulasikan suatu model matematika tentang perpindahan antar orang-orang rentan ke infeksi HIV, penderita AIDS dan seropositif non-AIDS. Model matematika yang menjelaskan penyebaran virus HIV dinyatakan dalam sistem persamaan differensial nonlinear, analisa kestabilan titik kesetimbangan dari model digunakan dengan metode Liapunov dan metode pelinearan untuk mengetahui kesetimbangannya model.
Kata Kunci : HIV, AIDS dan Kestabilan.
JURNAL SAINS DAN MATEMATIKA
2009-01-01 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3228
JURNAL SAINS DAN MATEMATIKA; Volume 17 Issue 1 Year 2009
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/9169
2015-09-19T16:46:49Z
sm:Art
"150415 2015 eng "
0854-0675
dc
Gamma Spectroscopy Response Analysis of Bismuth Germanium Oxide (BGO) and NaI (Tl) Detector to Determine the Detector Efficiency using the Monte Carlo MCNPX Method
Oktajianto, Hammam
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Setiawati, Evi
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Richardina, Verry
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Simulation of Gamma spectroscopy with Bismuth Germinate Oxide (BGO) and NaI(Tl) detectors has been done using Monte Carlo method in MCNPX computer program. Simulation was conducted by modelling detector scintillator geometry, model of radiation source which was Cobalt-60 and pulse count model. BGO and NaI(Tl) had a diameter of 3 inch and thickness of 3 inch and closed by Aluminium with 0.05 cm thickness. Extended radiation source of Cobalt-60 was in radius of 0.15 cm which was put in front of detector surface with distance of 0.001 cm, 2 cm, 4 cm, and 12 cm. The simulation results showed that the less radiation count with increasing distance of the radiation source which was put in front of detector. Reduce of the radiation count lead to decrease efficiency in each increase of radiation source distance. The detector efficiency to count gamma ray radiation of BGO detectors was better than NaI(Tl) detector. The maximum efficiency of both detectors was occurred at distance of 0.001 cm in front of detector. These results also showed that MCNPX was able to agreeably simulate detector process to determine spectroscopy Gamma response.
JURNAL SAINS DAN MATEMATIKA
2015-09-19 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/9169
JURNAL SAINS DAN MATEMATIKA; Volume 23 Issue 2 Year 2015
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3266
2015-10-14T08:25:56Z
sm:Art
0854-0675
dc
Penentuan Efisiensi Beta Terhadap Gamma Pada Detektor Geiger Muller
Azam, Muchammad
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
ABSTRAK---Telah dilakukan penentuan nilai effisiensi pencacah beta terhadap gamma pada tiga jenis detektor Geiger Muller yang memiliki jari-jari yang berbeda. Pencacahan dilakukan dengan menggunakan Cobalt-60 sebagai sumber radiasi dan aluminium foil sebagai absorber. Hasil penelitian menunjukkan bahwa efisiensi pencacah beta terhadap gamma untuk ketiga jenis detektor berbeda, detektor jenis 3 memiliki efisiensi paling besar. Adapun nilai efisiensi pencacah beta terhadap gamma untuk ketiga jenis detektor sebagai berikut: untuk detektor 1 adalah 0,40 %, detektor 2 adalah 3,31 %, dan detektor 3 adalah 0,53 %.
Kata kunci : Sumber radiasi Cobalt-60, Detektor Geiger Muller, Aluminium foil, effisiensi pencacah beta terhadap gamma.
JURNAL SAINS DAN MATEMATIKA
2012-04-20 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3266
JURNAL SAINS DAN MATEMATIKA; Volume 15 Issue 2 Year 2007
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/19987
2018-08-21T07:16:43Z
sm:Art
"180821 2018 eng "
0854-0675
dc
Pemanfaatan Susu Bubuk Kadaluwarsa dalam Complete Calf Starter dan Pengaruhnya terhadap Konsentrasi VFA dan Gula Sapih
Mukodiningsih, Sri
Fakultas Peternakan, Universitas Diponegoro
Semarang
Budhi, Subur Priyono Sasmito
Fakultas Peternakan, Universitas Gadjah Mada
Yogyakarta
Agus, Ali
Fakultas Peternakan, Universitas Gadjah Mada
Yogyakarta
Astuti, A
Fakultas Peternakan, Universitas Gadjah Mada
Yogyakarta
Peningkatan produksi susu dapat dilakukan melalui program cow replacement dengan pemeliharaan pedet yang optimal sebelum disapih. Hal ini dapat dicapai dengan pemberian pakan starter (calf starter dan sumber serat) bersama susu atau susu pengganti setelah lahir untuk mempercepat perkembangan rumen. Penelitian ini dilakukan dengan tujuan mengkaji penggunaan susu bubuk kedaluwarsa sebagai binder dalam complete calf starter (CCS) dan pengaruhnya terhadap perkembangan retikulo-rumen pedet pra sapih. Materi yang digunakan jerami jagung, jagung kuning, bungkil kedelai, dedak halus, premix dan pedet PFH pra sapih umur 1-2 minggu, bobot badan ±32 kg. Rancangan penelitian yang digunakan adalah rancangan acak lengkap terdiri dari 3 perlakuan. Perlakuan: I. Pellet 100% CCS (tanpa binder) (P0); II : Pellet 90% CCS + 10% susu bubuk kedaluwarsa (P10) ; III: Pellet 80% CCS + 20% susu bubuk kedaluwarsa (P20). Variabel yang diamati adalah kualitas kimia, fisik organoleptik (hardnees dan durability) dan kualitas biologis (konsumsi, pertambahan bobot badan harian (pbbh), kadar gula dan VFA darah). Data diolah dengan analisis variansi dilanjutkan dengan uji ganda Duncan. Uji biologis pada pedet umur 3 minggu, menghasilkan konsumsi, pbbh, konsentrasi gula dan VFA darah masih dalam kisaran normal. Disimpulkan bahwa penggunaan susu bubuk kadaluwarsa hingga 20% dalam CCS dapat diberikan pada pedet PFH umur 2 minggu dan menghasilkan indicator perkembangan rumen pedet yang baik
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/19987
JURNAL SAINS DAN MATEMATIKA; Volume 20 Issue 4 Year 2012
eng
Copyright (c) 2018 JURNAL SAINS DAN MATEMATIKA
oai:ojs.ejournal.undip.ac.id:article/3383
2015-09-30T16:00:17Z
sm:Art
0854-0675
dc
Pengaktifan Kapas Sebagai Resin Penukar Kation Asam Lemah
Arnelli, Arnelli
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
S., M. S.H. Yoga
Undip
Astuti, Yayuk
Undip
ABSTRAK---Dengan menggunakan beberapa reaksi kimia, gugus hidroksi dalam struktur selulosa mampu diubah menjadi senyawa eter (R-O-R). Senyawa eter yang disintesis tersebut mengandung gugus karboksilat yang mempunyai kation aktif yang dapat dipertukarkan dengan kation lain. Sebagai sumber selulosa adalah kapas alam. Pada penelitian ini, kapas alam diaktifkan dengan NaOH dan asam trikloroasetat sehingga menghasilkan senyawa eter selulosa. Pemanfatannya sebagai penukar kation dilakukan terhadap kation Cu. Hasil penelitian menunjukkan bahwa kondisi pengaktifan yang memberikan kapasitas adsorbsi optimum adalah pada suhu alkalisasi 60 0C, lama reaksi 120 menit dan konsentrasi asam trikloroasetat sebesar 0.06 M. pada kondisi pengaktifan ini kapas aktif mampu mengadsorbsi kation tembaga 44.10-2 mg/g kapas aktif.
Kata kunci: kapas aktif, trikloroasetat, penukar kation
JURNAL SAINS DAN MATEMATIKA
2006-10-04 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3383
JURNAL SAINS DAN MATEMATIKA; Volume 14 issue 4 Year 2006
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/7906
2015-09-19T16:58:36Z
sm:Art
"141219 2014 eng "
0854-0675
dc
Aktivitas Bakteri Kitinolitik Akuatik Isolat Lokal Terhadap Perkembangan dan Mortalitas Larva Nyamuk Aedes Aegypti L
Pujiyanto, Sri
Jurusan Biologi Fakultas MIPA Universitas Diponegoro
Tembalang Semarang Telp. 024-70799494
Ferniah, RS
Jurusan Biologi Fakultas MIPA Universitas Diponegoro
Tembalang Semarang Telp. 024-70799494
Rahardian, R.
Jurusan Biologi Fakultas MIPA Universitas Diponegoro
Tembalang Semarang Telp. 024-70799494
Pengendalian populasi nyamuk Aedes aegypti sangat penting dalam rangka pencegahan terjadinya wabah penyakit demam berdarah. Beberapa bakteri memiliki aktivitas kitinolitik sehingga berpotensi digunakan sebagai agen biokontrol terhadap nyamuk Aedes aegypti, karena komponen eksoskeleton larva nyamuk tersebut tersusun dari bahan kitin.Tujuan dari penelitian ini adalah untuk mendapatkan isolat bakteri kitinolitik akuatik lokal yang dapat digunakan sebagai biokontrol larva nyamuk Aedes aegypti. Bakteri kitinolitik diisolasi menggunakan media selektif agar kitin. Sumber isolat diperoleh dari berbagai sampel air yang diperoleh dari daerah Klaten, Boyolali dan Jepara. Isolat yang diperoleh diseleksi untuk mendapatkan isolat dengan aktivitas tinggi. Uji aktivitas bakteri terhadap larva nyamuk menggunakan media air mineral. Hasil penelitian diperoleh satu isolat dengan kode B6 yang mampu menyebabkan kematian larva nyamuk sebesar 97% dalam waktu 108 jam. Isolat ini berpotensi digunakan sebagai agen bioinsektisida untuk pengendalian larva nyamuk A. aegypti.
Keywords: Bakteri kitinolitik, demam berdarah, Aedes aegypti, biokontrol
JURNAL SAINS DAN MATEMATIKA
2014-03-11 00:00:00
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https://ejournal.undip.ac.id/index.php/sm/article/view/7906
JURNAL SAINS DAN MATEMATIKA; Volume 19 Issue 2 Year 2011
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/7993
2015-09-19T16:56:45Z
sm:Art
"150107 2015 eng "
0854-0675
dc
Fauna Kalajengking (Arachnida : Scorpiones) Di Pemukiman Jatiluhur Jatingaleh Semarang The scorpion fauna ( Arachnida : Scorpiones ) in Semarang Jatingaleh Jatiluhur Settlement
Hadi, Mochamad
Laboratorium Ekologi dan Biosistematik Jurusan Biologi
Fakultas Sains dan Matematika Universitas Diponegoro
Rohman, Arief Fatkhu
Laboratorium Ekologi dan Biosistematik Jurusan Biologi
Fakultas Sains dan Matematika Universitas Diponegoro
Lingkungan urban merupakan habitat kompleks yang dikembangkan manusia dari lokasi alami atau lahan pertanian yang secara berangsur-angsur dan sepenuhnya telah mengubah kondisi alami menjadi kondisi tidak alami. Lingkungan urban dan sub-urban menyediakan habitat yang sesuai untuk sejumlah kecil fauna kalajengking. Kalajengking sebagai hewan pemangsa berperan dalam menjaga keseimbangan ekosistem dan jaring makanan, namun demikian kontak dengan manusia menjadikan keberadaan kalajengking dalam lingkungan urban menjadi dilema tersendiri. Penelitian bertujuan untuk mengkaji keberadaan dan karekteristik habitat kalajengking di lingkungan urban di Jatiluhur, Jatingaleh, Semarang. Teknik pengamatan dilakukan dengan observasi secara langsung. Data pengamatan berupa karakteristik habiitat dijelaskan secara deskriptif. Hasil penelitian telah ditemukan dua spesies kalajengking yaitu Chaerilus variegatus dan Isometrus maculatus. Habitat kalajengking berupa pekarangan rumah, dengan mikrohabitat bebatuan, tumpukan genteng, sisa beton bangunan.
Kata kunci : kalajengking, Chaerilus, Isometrus.
Urban environment is a complex habitat that humans developed from natural or agricultural land locations that gradually and completely has changed the natural conditions into unnatural conditions . Urban environment and sub-urban provide suitable habitat for a small number of scorpion fauna . Scorpions as predators play a role in maintaining the balance of ecosystems and food webs , however, make the existence of human contact with scorpions in the urban environment into a dilemma . The study aims to assess the existence and characteristics of scorpion habitats in urban environments in Jatiluhur , Jatingaleh , Semarang . Engineering observations were made by direct observation . Observational data in the form of descriptive characteristics described habiitat . The results have been found in two species of scorpion that is Chaerilus variegatus and Isometrus maculatus .
Keywords : scorpion , Chaerilus , Isometrus
JURNAL SAINS DAN MATEMATIKA
2014-03-24 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/7993
JURNAL SAINS DAN MATEMATIKA; Volume 19 Issue 4 Year 2011
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8027
2015-09-21T20:59:52Z
sm:Art
"150109 2015 eng "
0854-0675
dc
Identifikasi Kandungan Kimia Ekstrak Etanol Serai Bumbu (Andropogon citratus D.C) dan Uji Efektivitas Repelen terhadap Nyamuk Aedes aegypti
P., Anita Verawati
Laboratorium Kimia Organik Jurusan Kimia Fakultas Sains dan Matematika
Universitas Diponegoro Semarang
Anam, Khairul
Organic Chemistry Laboratory, Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Kusrini, Dewi
Laboratorium Kimia Organik Jurusan Kimia Fakultas Sains dan Matematika
Universitas Diponegoro Semarang
Telah diidentifikasi kandungan kimia ekstrak etanol serai bumbu (Andropogon citratus D.C) dan diuji efektivitas repelen terhadap nyamuk Aedes aegypti. Penelitian ini bertujuan untuk mengetahui kemampuan ekstrak etanol akar, batang, dan daun serai bumbu (Andropogon citratus D.C) sebagai repelen nyamuk Aedes aegypti serta mengidentifikasi senyawa kimia yang terkandung dalam ekstrak serai bumbu yang paling aktif sebagai repelen. Ekstraksi dilakukan dengan metode maserasi menggunakan pelarut etanol. Masing-masing ekstrak akar, batang, dan daun serai bumbu diuji efektivitas repelen terhadap nyamuk Aedes aegypti betina dengan tiga variasi kadar yaitu 1%, 5% dan 10% untuk tiap ekstrak. Pengujian ini mengggunakan sukarelawan manusia. Hasil uji daya proteksi tertinggi terhadap nyamuk Aedes aegypti yaitu pada ekstrak etanol batang serai bumbu (Andropogon citratus D.C) sebesar 85,0 % pada kadar 5% di jam ke-3. Berdasarkan data GC-MS ekstrak etanol batang serai bumbu (Andropogon citratus D.C) mengandung 26 senyawa dengan komponen utama: Heksadekanol, Asam Nerat, Geraniol, Hidroksidihidromaltol, Asam Palmitat, dan Hidroksimetilfurfural.
Keywords: Identifikasi, Andropogon citratus D.C, Repelen, Geraniol
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8027
JURNAL SAINS DAN MATEMATIKA; Volume 21 Issue 1 Year 2013
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/2961
2015-10-14T11:36:01Z
sm:Art
0854-0675
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STRUKTUR DAN KOMPOSISI VEGETASI HABITAT JULANG EMAS (Aceros undulatus) DI GUNUNG UNGARAN JAWA TENGAH
Himmah, Izzun
Universitas Diponegoro Semarang
Utami, Sri
Universitas Diponegoro Semarang
Baskoro, Karyadi
Biology Department, Faculty of Sciences and Mathematics, Diponegoro University
Abstrak ---Julang emas merupakan salah satu jenis burung Bucerotidae yang seluruh jenisnya saat ini terancam punah karena jumlah populasinya yang terus menurun. Salah satu hal yang menyebabkan penurunan tersebut adalah berkurangnya kawasan habitat yang menyediakan vegetasi sebagai sumber pakan, tempat berlindung, bermain, istirahat, mengasuh dan membesarkan anak-anaknya. Gunung Ungaran menrpakan salah satu habitat buruag Julang emas yamg terdapat di Jawa Tengah. Prevalensi Julang emas di Gunung Ungaran hanya terdapat di Bukit Watuondo dan Bukit Gentong. Tujuan penelitian ini adalah untuk membandingkan struktur dan komposisi vegetasi antara Bukit Watuondo dan Bukit Gentong, serta mengetahui ketersediaan vegetasi yang berpotensi sebagai habitat sarang dan sumber pakan di kedua wilayah tersebut. Bukit Watuondo dan Bukit Gentong ditentukan sebagai stasiun pengamatan. Masing-masing stasiun dibagi menjadi 5 titik sampling. Setiap titik sampling dibuat satu fransek yang terdiri atas 5 plot ulangan berukuran 10x10 m dan ditentukan secara sistematik. Analisis data menggunakan Indeks Nilai Penting,
Indeks Kemelimpahan dan Indeks Keanekaragaman. Hasil penelitian menunjukkan terdapat 90 jenis pohon yang tergabung dalam 37 famili. Bukit Watuondo memiliki indeks keanekaragaman jenis yang lebih rendah dibandingkan Bukit Gentong. Bukit Watuondo lebih berpotensi sebagai habitat sarang dibandingkan dengan
Bukit Gentong. Ketersediaan Ficus yang lebih banyak di Bukit Gentong merupakan habitat sumber pakan bagi Julang emas. Melihat data vegetasi yang diperoleh, perlu dilakukan penanaman pohon Ficus agar populasi Julang emas di Gunung Ungaran tidak mengalami penurunan dan akhirnya punah.
Kata kunci: vegetasi, habitat, Julang emas (Aceros undulatus), Gunung Ungaran
permalink : http://ejournal.undip.ac.id/index.php/sm/article/view/2961
JURNAL SAINS DAN MATEMATIKA
2010-07-03 00:00:00
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https://ejournal.undip.ac.id/index.php/sm/article/view/2961
JURNAL SAINS DAN MATEMATIKA; Volume 18 Issue 3 Year 2010
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8029
2015-09-30T15:45:59Z
sm:Art
"150109 2015 eng "
0854-0675
dc
Senyawa Hiptolida dan Pektinolida dalam Fraksi Diklorometana dari Daun Hyptis pectinata Poit
Suzery, Meiny
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Gultom, Merry
Laboratorium Kimia Organik Jurusan Kimia, Fakultas Sains dan Matematika Undip, Semarang
Jalan Prof. Soedarto, Tembalang, Semarang 50275, Telepon (024) 7474754
Cahyono, Bambang
Organic Chemistry Laboratory, Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University, Semarang Jalan Prof. Soedarto, Tembalang, Semarang 50275, Telepon +62-24-7474754
Hyptis pectinata Poit merupakan salah satu tanaman Lamiaceae, tanaman ini tumbuh subur dan mudah diperoleh pada tempat yang cukup sinar matahari. Penelitian ini bertujuan untuk memperoleh senyawa bioaktif yang terdapat dalam fraksi diklorometan dari daun Hyptis pectinata Poit. Metode pemisahan menggunakan teknik kromatografi dan penetuan struktur menggunakan spektroskopi inframerah dan GC/MS. Hasil pemisahan dengan kolom kromatografi diperoleh kristal dengan titik leleh titik leleh 88,5-890C, spektrofotometer inframerah memiliki serapan bilangan gelombang 1735 cm-1 menunjukkan adanya gugus α,β lakton tak jenuh sebagai kerangka dasar dari senyawa hiptolida. Sedangkan yang berupa cairan dianalisis dengan GC-MS pada waktu retensi 11,701 menit dan m/z pada 239 dengan base peak 43 sebagai kerangka dasar dari senyawa pektinolida.
Keywords: Hyptis pectinata Poit, BSLT, Hiptolida, Pektinolida
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8029
JURNAL SAINS DAN MATEMATIKA; Volume 21 Issue 2 Year 2013
eng
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oai:ojs.ejournal.undip.ac.id:article/3144
2016-05-02T10:05:08Z
sm:Art
0854-0675
dc
PENGARUH PERLAKUAN HCl PADA KRISTALINITAS DAN KEMAMPUAN ADSORPSI ZEOLIT ALAM TERHADAP ION Ca2+
Pardoyo, Pardoyo
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Listiana, Listiana
Universitas Diponegoro
Darmawan, Adi
Universitas Diponegoro
ABSTRACT--It has been done a research to determine the influence of hydrochloric acid treatnent to the crystalinity and adsorption capability of natural zeolite to Ca2+ ion. Activation process was conducted by refluxing of zeolite with KMnOa 0.5 M and HCI (1:1) for 4 hours with temperature of 80"C. The various concentration of HCI soltrtions used were 4 M (AZl), 6 M (AZZ),8 M (AZ3) and l0 M (AZA). Crstalinity of zeolite was identified by X-Ray Diftaction CXRD) while the amount of adsorbed Ca2* ion was measured by Atomic Absorption Spectroscopy (AAS). The activated zeolite was applied to adsorb calcium metal ion using shaker for 5, 15, 60, 90 dan 120 minutes. The results showed that the increasing of HCI concentration for zeolite
activation caused the decreasing of crystallinity of NZ, AZl, AZ2, AZ3 wrd AZ1 nunely 100%; 101.10%; 9l.9lo/o; 84.93o/o and 77 .45o/o respectively. The adsorption percentage. of Ca2* ion from conc,entration originally
698 ppm (within 60 minutes) for NZ, AZl, AZ2, AZ3 and AZ,4 was successively 10.75 Vo; 20.91o/o; l:4.610/o;
19.63% and 24.07o/o. The results indicated that the decreasing of crystallinity of zeolite caused the increasing of zeolite adsorption ability to Ca2* ion.
Keywords : zeolite, crystallinity, adsorption, , Ca2* ion
JURNAL SAINS DAN MATEMATIKA
2010-10-22 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3144
JURNAL SAINS DAN MATEMATIKA; Volume 17 Issue 2 Year 2009
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/9144
2015-09-30T15:50:09Z
sm:Art
"150116 2015 eng "
0854-0675
dc
The Bioelectricity of Tofu Whey in Microbial Fuel Cell System with Lactobacillus bulgaricus
Inayati, Nor Sri
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Aminin, Agustina L. N.
Biochemistry Laboratory, Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Suyati, Linda
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Tofu whey is a byproduct of the manufacturing process tofu which containing the remains of protein, fat, carbohydrates and water-soluble substances that do not agglomerate. This study aim was to assess the potential of tofu whey as a substrate in the MFC system and to evaluate the effect of agitation speed to the potential difference generated in the MFC system using Lactobacillus bulgaricus. The potential difference in the variation of the substrate was measured against tofu whey, glucose and lactose. The potential difference with agitation speed variation was carried out at speed of 30, 60, 90, 125 and 250 rpm. The highest potential differences in the substrate variation showed relatively similar results, however they were achieved in different times, which the speed was dependent on the complexity of the substrate molecular structure. While the agitation of 90 rpm gave the highest potential difference. These results indicates that tofu whey potential to be used as a MFC substrate.
JURNAL SAINS DAN MATEMATIKA
2015-09-16 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/9144
JURNAL SAINS DAN MATEMATIKA; Volume 23 Issue 1 Year 2015
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3261
2015-09-19T17:09:40Z
sm:Art
0854-0675
dc
Reduksi Persamaan Dirac ke Persamaan Cauchy Nondegenerate
Hariyanto, Susilo
Undip
ABSTRAK---Persamaan Dirac abstrak adalah suatu sistem persamaan diferensial parsial yang memiliki struktur abstrak sebagai berikut
ψ(t) = -i(cD + mc2 (τ-1) + V) ψ(t)
dengan massa m>0, kecepatan cahaya c>0. Dalam artikel ini dikaji suatu cara mereduksi persamaan dirac abstrak yang dapat dipandang sebagai masalah Cauchy degenerate, ke masalah Cauchy abstrak nondegenerate. Reduksi ini dapat dilakukan dengan memformulasikan masalah yang dibicarakan dalam ruang Hilbert H dan tranformasi T: H H yang didefinisikan sebagai fungsi berkut:
ψ(t) Є D(D) ....∆∆ H T -> T (ψ(t)) Ξ s(t) = ( P+ + cP-) ψ(t)
Kata kunci: Cauchy Degenerate, Nondegenerate, Persamaan Dirac, Ruang Hilbert
JURNAL SAINS DAN MATEMATIKA
2007-01-01 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3261
JURNAL SAINS DAN MATEMATIKA; Volume 15 Issue 1 Year 2007
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/10483
2016-05-02T10:44:57Z
sm:Art
"151015 2015 eng "
0854-0675
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Structure Elucidation of the Leaf of Tithonia diversifolia (Hemsl) Gray
Amanatie, Amanatie
Chemical Education Department, Faculty of Mathematics and Natural Sciences, State University of Yogyakarta
Sulistyowati, Eddy
Chemical Education Department, Faculty of Mathematics and Natural Sciences, State University of Yogyakarta
Stucture elusidation of the leaves of Tithonia diversifolia (Hemsl) A.Gray, were reported. The compounds were obtained by maceration and analyzed by GC–MS. The compounds of the leaves were the non volatile fractions of the plant are a rich source of Camphene 0, 6 (SI 9.53)., β-pinene 10, 9 (SI 8, 9)., Myrcene 0.8(SI 9, 92)., 1, 8-Cineole0, 91 (SI 1, 03)., β–Caryophyllene 2, 08 (SI 1, 419)., β-Gurjunene0.4(SI1, 428)., α Humulene1.6 (SI 1, 454) Germacrene D 12, 6 % (SI 1, 481), characterized presented the Tithonia diversifolialeaf
JURNAL SAINS DAN MATEMATIKA
2016-05-02 10:45:02
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/10483
JURNAL SAINS DAN MATEMATIKA; Volume 23 Issue 4 Year 2015
eng
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oai:ojs.ejournal.undip.ac.id:article/3288
2015-10-14T09:54:32Z
sm:Art
0854-0675
dc
PENINGKATAN EMISI HIDROGEN MELALUI ATOM HELIUM METASTABIL DENGAN METODE LASER INDUCED PLASMA PADA SAMPEL ZIRCALOY
Maliki, Maliki
Undip
Firdausi, Ketut Sofjan
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Budi, Wahyu Setia
Undip
ABSTRACT-Telah dilakukan analisis unsur hidrogen dari sampel zircoloy dan sampel batu hitam melalui pembangkitan plasma gelombang kejut menggunakan laser Nd YAG (1064 nm, 8 ns, 68 mJ) pada tekanan rendah dengan mengalirkan gas helium dan gas nitrogen sebagai gas penyangga di dalam ruang sampel. Penelitian dilakukan untuk menunjukkan pengaruh atom helium metastabil pada peningkatan emisi hidrogen. Pengaruh atom helium metastabil pada peningkatan emisi hidrogen ditunjukkan dengan membandingkan penggrmaan gas nitrogen dan gas helium sebagai gas penyangga pada tekanan 2 torr dan 5 torr. Dari penelitian, intensitas emisi hidrogen menggunakan gas nitrogen pada tekanan 2 torr dan gas helium pada 5 torr untuk sampel zircaloy masing-masing diperoleh sebesar 317,0 cacah/detik dan 4370,0 cacah/detik, sedangkan pada sampel batu hitam masing-masing diperoleh sebesar 297,6 cacah/detik dan 694,0 cacah/detik. Hasil ini menunjukkan atom helium metastabil yang dihasilkan melalui helium sebagai gas penyangga berpengaruh terhadap peningkatan emisi hidrogen pada sampel zircaloy dan batu hitam.
Kata kunci : sampel zircaloy, sampel batu hitam, laser induced plasma, atom helium metastabil, emisi hidrogen dan emisi helium.
JURNAL SAINS DAN MATEMATIKA
2010-10-22 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3288
JURNAL SAINS DAN MATEMATIKA; Volume 17 Issue 2 Year 2009
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/7902
2015-09-19T16:59:02Z
sm:Art
"141219 2014 eng "
0854-0675
dc
Konstruksi Greedy Kode Lexicographic untuk Membangun Perluasan Kode Golay (24 12,8)
Aini, Aurora Nur
Jurusan Matematika FMIPA UNDIP
Jalan Prof. Soedarto, SH. Tembalang Semarang 50275
Irawanto, Bambang
Jurusan Matematika FMIPA UNDIP
Jalan Prof. Soedarto, SH. Tembalang Semarang 50275
Golay codes can be constructed by lexicographic codes. Lexicographic codes constructed by Greedy algorithm. Greedy construction is one type of Greedy algorithm. Given codes with minimum distance d and length n. To construct the greedy algorithm, the codeword with length n are processed in some fixed order, and the next codeword is inserted in the code when its distance from all codewords previously selected is d. On Greedy construction, to set (n, k,d) codes, we only need to set (n-k,k) codes with k iteration.
Keywords: linear codes, lexicographic codes, Golay, generator matrix
JURNAL SAINS DAN MATEMATIKA
2014-03-11 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/7902
JURNAL SAINS DAN MATEMATIKA; Volume 19 Issue 1 Year 2011
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/7997
2015-09-19T16:56:12Z
sm:Art
"150107 2015 eng "
0854-0675
dc
Pengaruh Biostarter Pengurai Bahan Organik Terhadap Kapasitas Infiltrasi Air dan Struktur Komunitas Mesofauna Tanah
Andriani, Latifah Fitria
Laboratorium Ekologi dan Biosistematika Jurusan Biologi FSM Undip
Rahadian, Rully
Laboratorium Ekologi dan Biosistematika Jurusan Biologi FSM Undip
Peran mikroorganisme dan fauna tanah dalam menentukan kualitas tanah telah diketahui cukup luas, namun perannya terhadap kapasitas infiltrasi air belum banyak dikaji. Penelitian ini secara umum bertujuan untuk mengetahui pengaruh biostarter berupa inokulan mikroba komersial untuk perbaikan kualitas tanah. Secara khusus penelitian ini bertujuan untuk mengetahui pengaruh produk biostarter terhadap struktur komunitas mesofauna tanah dan laju infiltrasi air serta korelasi antara struktur komunitas mesofauna tanah dengan kapasitas infiltrasi. Penelitian ini menggunakan Rancangan Acak Lengkap faktor tunggal dengan empat perlakuan biostarter yaitu EM4, Bioklin, Mig Dec, dan Orgadec. Periode sampling dilakukan dua kali pada hari ke 30 dan hari ke 50 inkubasi. Hasil penelitian menunjukkan bahwa penambahan biostarter memengaruhi struktur komunitas mesofauna tanah, khususnya berpengaruh positif terhadap kelimpahan Oribatida dan Mesostigmata. Produk Orgadec secara konsisten mampu meningkatkan kelimpahan mesofauna tanah paling tinggi pada 30 hari maupun 50 hari. Laju infiltrasi pada umur inkubasi 30 hari menunjukkan adanya perbedaan yang nyata pada perlakuan Orgadec saja, sedangkan pada umur 50 hari, perbedaan secara nyata ditunjukkan pada perlakuan EM4, Mig Dec dan Orgadec. Secara statistik, total kelimpahan mesofauna tanah dan kelimpahan Oribatida menunjukkan perbedaan yang nyata dengan laju infiltrasi.
Keywords: biostarter, struktur komunitas, mesofauna tanah, laju infiltrasi
JURNAL SAINS DAN MATEMATIKA
2014-03-24 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/7997
JURNAL SAINS DAN MATEMATIKA; Volume 20 Issue 1 Year 2012
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8026
2016-03-04T15:32:01Z
sm:Art
"150109 2015 eng "
0854-0675
dc
Pembuatan Material Magnetik Komposit BaFe9Mn0,75Co0,75Ti1,5O19 / Elastomer untuk Aplikasi Penyerap Gelombang Elektromagnetik
Priyono, Priyono
Material Physics Laboratory, Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Prasongko, Windu Ganar
Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro, Semarang
Telah dilakukan penelitian dan pengujian material magnet BaFe12-2x(MnCo)xTixO19 yang merupakan material magnet Hexaferrite tipe M dan disubtitusi secara parsial 2 ion Fe3+dengan sebuah ion Mn2+,Co2+,dan sebuah ion Ti4+ dengan menggunakan metode sol gel.Material magnet dibentuk dari senyawa-senyawa Ba(NO3)2,Fe(NO3)2,Mn(NO3)2,Co(NO3)2,Ti(NO3)4.BaFe12-2x(MnCo)xTixO19 untuk x=1,5 disintesis dengan menggunakan metode sol gel, berupa serbuk. Hasil dari uji magnetik diperoleh nilai koersivitasnya 3,8 kA/m dan nilai magnetisasinya 0,29 Tesla.Hasil uji densitas pellet barium heksaferrite bernilai 3,453 hingga 5,060 gr / cm3 untuk lolos saring 90 μm.Analisa morfologi permukaan sampel dengan menggunakan Scanning Electron Microscopy (SEM) menunjukkan adanya heterogenitas ukuran partikel.Hasil uji absorbsi menunjukkan penyerapan pada daerah range 8-12 GHz.Hasil uji mekanik menunjukkan bahwa uji daya rekat elastomer memiliki variasi nilai pada titik yang berbeda.
Keywords: BaFe12-2x(MnCo)xTixO19 untuk x=1,5,sol gel
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8026
JURNAL SAINS DAN MATEMATIKA; Volume 21 Issue 1 Year 2013
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8060
2015-09-30T13:19:34Z
sm:Art
"150113 2015 eng "
0854-0675
dc
Bioakumulasi Timbal (Pb) oleh Hydrilla verticillata L.f. Royle di Danau Rawapening, Ambarawa Semarang
Marthana, Wildan Suyuti Mustofa
Mahasiswa Magister Biologi Undip Jurusan Biologi Fakultas Sains dan Matematika UNDIP
Soeprobowati, Tri Retnaningsih
Biology Department, Faculty of Sciences and Mathematics, Diponegoro University
Izzati, Munifatul
Jurusan Biologi FSM Undip Jurusan Biologi Fakultas Sains dan Matematika UNDIP
Rawapening lake is the one of national priority 2010 – 2014 that must get safe because the worse condition from eutrofication and water degradation quality. Eutrofication of Rawapening lake caused by nutrients/organic compounds enrichment naturally or anthropogenically, that signed by higher concentration of Nitrogene and Phosphate that trigger hydrilla blooming. The blooming of hydrilla disturb Rawapening Lake functions like flood bender, fisheries and tourism. However in another side this plants can be used to heavy metal remediation such as Pb as act of human activities like farming, fisheries, tourism, and home industry around the lake. There were many researchs to explore hydrilla potention for remediation, but still laboratory scale with under control condition. Because of these, it’s required to do a research to find out fitoremediation potention of hydrilla to remediate heavy metal Pb in Rawapening Lake water and sediment (In – situ) to study its Pb bioaccumulation. Research was start in August – October 2013 used hydrilla in three weeks. That plants was planted in pond 1 m3. It was planted one plant each pond with 100 gram fresh weight and observed each week to calculated the Pb concentration. The parameter was observed is BAF (bioaccumulation factor) Pb sediment. The result is hydrilla has highest BAF value in week two with 97,90%. Hydrilla has potention to remediate heavy metal Pb that contain in sediment and it can harvested in two weeks.
Keywords : Eutrofication, Rawapening Lake, hydrilla, bioaccumulation, fitoremediation.
Danau Rawapening merupakan salah satu danau prioritas nasional 2010 – 2014 yang perlu diselamatkan karena kondisinya yang sudah sangat memprihatinkan akibat adanya proses eutrofikasi dan degradasi kualitas air. Kondisi eutrofik Danau Rawapening disebabkan oleh pengkayaan unsur hara karena pasokan bahan organik secara alami maupun yang berasal dari aktivitas manusia, yang ditandai dengan tingginya konsentrasi total Nitrogen dan Posfat sehingga memacu pertumbuhan yang tidak terkontrol / blooming hydrilla. Blooming hydrilla mengganggu fungsi Danau Rawapening sebagai pengendali banjir, perikanan dan kegiatan wisata. Namun di sisi lain bisa jadi mampu meremediasi logam berat Pb dengan cara mengakumulasi sebagai akibat dari aktivitas manusia yang meliputi pertanian, peternakan, industri pariwisata, dan industri perumahan. Sudah ada penelitian – penelitian yang dilakukan untuk mengeksplorasi potensi hydrilla untuk remediasi, namun masih dalam skala laboratorium dengan kondisi lingkungan yang terkontrol. Oleh karena itu perlu dilakukan penelitian mengenai potensi fitoremediasi hydrilla yang ditanam di Danau Rawapening (in - situ) untuk mengkaji bioakumulasi Pb pada hydrilla di Danau Rawapening. Penelitian dimulai bulan Agustus – Oktober 2013 menggunakan 1 jenis tanaman yaitu hydrilla dan lama waktu tanam 3 minggu. Tanaman di tanam dengan metode mesocosm yaitu ditanam di dalam plot ukuran 1m3 dengan kepadatan tiap plot yaitu 1 individu dengan berat basah 100 gram dan diamati tiap minggu untuk dihitung kandungan logam Pb. Parameter yang diamati adalah kandungan logam berat Pb sedimen dan akar hydrilla untuk memperoleh nilai BAF (bioaccumulation factor). Hasilnya adalah nilai bioacumulation factor (BAF) Pb sedimen paling tinggi oeh hydrilla adalah minggu kedua sebesar 97,90%. Hydrilla memiliki potensi untuk mengurangi pencemaran logam berat Pb yang terkandung di dalam sedimen dan dapat dipanen dalam waktu 2 minggu.
Kata Kunci : Eutrofikasi, Danau Rawapening, hydrilla, bioakumulasi, fitoremediasi
JURNAL SAINS DAN MATEMATIKA
2014-04-16 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8060
JURNAL SAINS DAN MATEMATIKA; Volume 22 Issue 2 Year 2014
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8007
2015-09-30T10:11:02Z
sm:Art
"150108 2015 eng "
0854-0675
dc
Studi Uniformitas Dosis Radiasi CT Scan pada Fantom Kepala yang Terletak pada Sandaran Kepala
Retnoningsih, Dwi Siwi
Instalasi Radiologi Rumah Sakit Hasan sadikin, Bandung
Anam, Choirul
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Setiabudi, Wahyu
Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro, Semarang
The research on the impact of tube current and tube voltage on uniformity of the point dose in the head phantom was placed on the table, had been conducted. The research was carried out on the CT Scan machine, Siemens Somatom Emotion 6. The detector used was CT dose profiler and Piranha Electrometer 556. The phantom was head phantom with PMAA material with diameter 16 cm and length 15 cm. The measurement of point dose carried out by using axial mode. The measurement conducted in five points inside the head phantom. In this research, the tube current and tube voltage were varied. The results show that the point dose on the head phantom was placed on the table is non-uniform. At the bottom of the phantom, the dose is lower to below 50% than at the top of the phantom.
Keywords: CT Scan, Dose uniformity, Point Dose, CTDI
JURNAL SAINS DAN MATEMATIKA
2014-03-25 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8007
JURNAL SAINS DAN MATEMATIKA; Volume 20 Issue 2 Year 2012
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3139
2015-09-19T17:06:32Z
sm:Art
0854-0675
dc
UJI KAUSITAS GRANGER PADA MODEL HARGA SAHAM PT INDOFOOD SUKSES MAKMTUR INDONESIA TBK.
I Marudani, Di Asih
Universitas Diponegoro
Astuti, Tutut Dewi
Universitas Mercu Buana Yogyakarta
ABSTRAK---Jika terdapat dua variabel atau lebih dalam Model Vector Autoregressive (VAR) orde p, maka tidak menutup kemungkinan bahwa antara variabel-variabel tersebut saling mempengaruhi. Hubungan ini dapat berupa pengaruh satu arah, dua arab, atau tidak terdapat antar variabel-variabel. Hubungan-hubungan semacam itu disebut hubungan kausalitas. Untuk membuktikan keberadaan hubungan kausalitas dalam suatu model VAR dapat digunakan Uji Kausalitas Granger. Penelitian ini menguji keberadaan hubungan kausalitas antara harga saham dengan kinerja keuangan perusahaan PT Indofood Sukses Makmur Tbk. periode 1998-2005. Penelitian ini akan menyelidiki beberapa variabel yang terlibat dalam model simultan harga saham, yaitu harga saham (Yr) dan kinerja kuangan perusahaan yang diwakili oleh variabel-variabel Return of Assets atau ROA (Y2), Debt to Equity Ratio atau DER (Y3), dan Earning Per Share atau EPS (Yr). Hasil penelitian menunjukkan variabel-variabel dalam model tidak stasioner dan terintegrasi pada derajat I, serta residualnya bersifat independen dan terdistribusi normal. Dengan AIC dan SC disimpulkan bahwa masing-masing persamaan memuat 4 lag. Dengan uji kausalitas Granger disimpulkan bahwa terdapat hubungan satu arah antara variabel harga saham terhadap ROA dan EPS, sedangkan
hubungan satu arah juga ditunjukkan variabel DER terhadap harga saham. Hal ini menuqiukkan bahwa antara harga saham dan kinerja keuangan perusahaan tidak terdapat hubungan dua arah.
Kata kunci : model simultan, Vector Autoregressive (VAR), Uji Kausalitas Granger, Harga Saham, Return of Assets (ROA), Debt to Equrty Ratio (DER), dan Earning Per Share (EPS).
JURNAL SAINS DAN MATEMATIKA
2010-10-22 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3139
JURNAL SAINS DAN MATEMATIKA; Volume 17 Issue 2 Year 2009
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/9003
2015-08-30T15:47:41Z
sm:Art
"141015 2014 eng "
0854-0675
dc
Flavonoids Production Capability Test of Tea Mistletoe (Scurrula atropurpurea BL . Dans) Endophytic Bacteria Isolates
Priyanto, Jepri Agung
Diponegoro University
Pujiyanto, Sri
Diponegoro University
Rukmi, Isworo
Diponegoro University
Tea Mistletoe (S. Atropurpurea BL. Dans) is a medicinal plant species used as anticancer because it contains some flavonoids compounds are chalcones, c-glycoflavonols, chatechin and quercetin. The ability of endophytic bacteria to produce similar bioactive compounds with its host plant is potential source to get flavonoids compounds. This research aims to know ability of endophytic bacteria in produce flavonoids compounds in vitro. Each isolate was fermented in submerged culture with 0.1% soluble starch, 0.5% pepton, and 0.15% yeast extract medium for 5 days, then extracted with ethyl acetate. Flavonoid content of the extract then was tested qualitatively and confirmation test used thin layer chromatography. Qualitative test results showed that crude extract from isolates B4, B5, B10, B17, and B19 positive containing flavonoids. The most potent extract were B10 and B19 tested by thin layer chromatography. Two of these extracts had the same Rf value with quercetin, thus endophytic bacteria from tea mistletoe can produce flavonoids in vitro.
JURNAL SAINS DAN MATEMATIKA
2015-08-30 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/9003
JURNAL SAINS DAN MATEMATIKA; Volume 22 Issue 4 Year 2014
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3256
2015-09-19T17:08:12Z
sm:Art
0854-0675
dc
Perbandingan Kadar Garam Natrium dan Kalium pada Tes Ferning Lendir Mulut
Mardiati, Siti Muflichatun
UNDIP
ABSTRACT---The objective of this study was to know natrium and potassium levels of oral mucus ferning test. The object were 30 women, that were taken their oral mucus once within the 6th to 19th day of menstruation. The ferning test of oral mucus were examined with light microscope. The data distribution was analized by Kolmogorf – Smirnov, followed by non – parametric statistics. The mean, median and standard deviation were calculated with descriptive analysis. The Wilcoxon signed rank test was used to analyze the differentiation between the natrium and potassium levels of oral mucus in groups. The result of this study shows that the oral mucus potassium level is higher than natrium level. It means that potassium more important than natrium in the oral mucus ferning test.
Keywords : potassium, natrium, ferning score, oral mucus
JURNAL SAINS DAN MATEMATIKA
2007-01-01 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3256
JURNAL SAINS DAN MATEMATIKA; Volume 15 Issue 1 Year 2007
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/9273
2015-10-14T09:33:37Z
sm:Art
"150715 2015 eng "
0854-0675
dc
The Potential Test of Fungal Antagonist Trichoderma viride to inhibit the Growth of Pathogenic Fungi Fusarium moniliforme and Alternaria solani In-Vitro
Purwantisari, Susiana
Biology Department, Faculty of Sciences and Mathematics, Diponegoro University
Evendi, Agus
Biology Department, Faculty of Sciences and Mathematics, Diponegoro University
Fusarium moniliforme and Alternaria solani are two types of mold which often cause the diseases of cultivated plants. Fusarium moniliforme causes the ear rot disease on corn and the wilt disease of Solanaceae family. Whereas the pathogenic fungus Alternaria solani causes an early bright disease on the onion and potato. This aim of this study was to determine the ability of fungal antagonist Trichoderma viride in inhibiting the growth of Fusarium moniliforme and Alternaria solani in vitro. The growth inhibition ability test were conducted on dual cultures by growing the fungal antagonists with pathogenic fungi in Petri dish containing potato dextrose agar media face-to-face in a distance of 3 cm. Percentages of the growth inhibiting were observed every day in 7 days incubation. The results showed that the fungal antagonist T. viride exhibited the highest inhibition on F. moniliforme in 3 days incubation period which was 63.07 %. Yet the highest inhibition against A. solani was in 2 days incubation period which was 57.35 %. T. viride growth continued to increase since the first day until the seventh day incubation period but contrarily the growth of both pathogenic fungi underwent inhibition. This suggested that T. viride was potential as a biological control agent of F. moniliforme and A. solani growth and have a potency as an active bio fungicide ingredient.
Keywords: Dual culture; percentage inhibiting; Trichoderma viride; Alternaria solani; Fusarium moniliforme
JURNAL SAINS DAN MATEMATIKA
2015-10-14 09:33:37
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/9273
JURNAL SAINS DAN MATEMATIKA; Volume 23 Issue 3 Year 2015
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3277
2015-09-19T17:10:55Z
sm:Art
0854-0675
dc
PENGARUH KONSENTRASI DAN LAMA PERENDAMAN DALAM SUPERNATAN KULTUR Bacillus sp.2 DUCC-BR-KI.3 TERHADAP PERTUMBUHAN STEK HORISONTAL BATANG JARAK PAGAR (Jatropha curcas L.)
Pamungkas, Febriani Tri
Undip
Damranti, Sri
Undip
Raharjo, Budi
Undip
ABSTRACT--Jarak pagar (J. curcas L.) is a plant whose the seed can produce oil or it is known as biodiesel. J. curcas's oil is the source of alternative oil energti that can be renewable and environmentally safe. Another ways to increase the production of J. curcas's oil is by improving its productivity. This activity cannot be separated from the problem of supplying the seed. Stem cutting is one of the most ways to provide the seed than another way. The growth of stem cutting can be stimulated by giving ZPT that is IAA both naturally and synthetically. Bacillus sp.2 DUCC-BR-KL.3 supernatant culture that contain IAA can be one of naturally alternative hormone. The aims of this research was to study the effect of concentration and submersion period in Bacillus sp.2 DUCC-BR-KL.3 supernatant culture to the growth of J. curcas L. hoizontal stem cutting. This experiment was condueted in Plant's Biologi Structure and Function Laboratory, MIPA faculty, Diponegoro University. Experimental design used in this research is Completely Random Design with Factorial pattern 5x4 by using 5 replications. The first factor was concentration, ie P0 (control), P1 (25%), P2 (50%), P3 (75%) and P4 (100%). The second factor was submerged periods, i.e T1 (1 hour), T2 (2 hours), and T3 (3 hours). The data were analyzed by using Kruskal-Wallis Test and ANOVA, if there are significantly influence, were analyzed by using Duncan multiple range test with 95% confidence intevals that is in the variable of root lenght and weight of dry root. The result of this sudy showed that the giving of Bacillus sp.2 DUCC-BR-KL.3 supernatant culture influence to improve the bud and root growth of J. curcas L.
Keywords : Jatropha culcos L., supernalant, concentration, growth
JURNAL SAINS DAN MATEMATIKA
2012-04-23 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3277
JURNAL SAINS DAN MATEMATIKA; Volume 17 Issue 3 Year 2009
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/6251
2015-09-21T09:07:33Z
sm:Art
"140226 2014 eng "
0854-0675
dc
SISTEM MONITORING KEAMANAN KANDANG SAPI BERBASIS BORLAND DELPHI 7.0
Annisa, Nur
Jurusan Instrumentasi dan Elektronika Universitas Diponegoro
Jl. Prof. H. Soedarto, SH. Tembalang Semarang 50275
Danusaputro, Hernowo
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
ABSTRACT--A software for the cow shed security system has been made with Borland Delphi 7.0.This program can observe a cow shed security optimally.The cow shed security monitoring system is done byusing LDR (Light Dependent Resistor) censor. Borland Delphi 7.0 program will display the cow shed securitymonitoring result from a data which sent by a censor. Beside that, this software programming uses BorlandDelphi 7.0 which connecting to Microsoft Access 2007 as a data saving. From this software making which hasbeen done, we had the result that this system can monitoring the cow of shed by LDR (Light Dependent Resistor)censor. Testing result shows that if someone try to enter the cow shed area, automatically LDR (Light DependentResistor) censor will detects and showed software on PC or laptop. Beside that, we will hear the sound of alarmas early warning system.
KeyWords: Cow shed, Borland Delphi7.0, database.
JURNAL SAINS DAN MATEMATIKA
2014-02-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/6251
JURNAL SAINS DAN MATEMATIKA; Volume 18 Issue 4 Year 2010
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/7910
2015-09-19T16:59:31Z
sm:Art
"141223 2014 eng "
0854-0675
dc
Pengaruh Jumlah Katalis Zeolit Alam Asam dalam Proses Perengkahan Asap Cair Tempurung Kelapa
Windari, Tri
Jurusan Kimia FMIPA, Universitas Diponegoro, Semarang
Suseno, Ahmad
Jurusan Kimia FMIPA, Universitas Diponegoro, Semarang
Telah dilakukan penelitian tentang pengaruh jumlah katalis zeolit alam asam dalam proses perengkahan asap cair tempurung kelapa. Katalis zeolit alam asam dibuat dengan aktivasi, kalsinasi dan proses hidrotermal zeolit alam wonosari. Karakter katalis meliputi rasio Si/Al, keasaman, luas permukaan, volume pori dan rerata jejari pori, masing-masing ditentukan dengan Spektroskopi Serapan Atom (AAS), metode adsorpsi NH3 dan BET surface area analyzer. Perengkahan asap cair tempurung kelapa dengan variasi berat katalis dilakukan dengan reactor batch dan produk cair yang diperoleh dianalisis dengan GC dan GC-MS. Hasil preparasi katalis menghasilkan katalis zeolit alam asam dengan Rasio Si/Al = 10,25, keasaman = 5,18 mmol/gram, luas permukaan = 96,60 (m2/g) volume pori = 51,00. 10-3 (cc/g) dan rerata jejari pori = 10,56 (Å). Proses perengkahan asap cair tempurung kelapa efektif terjadi pada penggunaan katalis seberat 2 gram.
Keywords: asap cair, perengkahan, katalis
JURNAL SAINS DAN MATEMATIKA
2014-03-14 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/7910
JURNAL SAINS DAN MATEMATIKA; Volume 19 Issue 3 Year 2011
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8017
2015-09-30T10:08:58Z
sm:Art
"150108 2015 eng "
0854-0675
dc
Pengaruh Perubahan Tegangan Tabung (kVp) Terhadap CT Number dan Uniformitasnya pada Pesawat CT Scan
S., Anugrah Ariyani
Instalasi Radiologi RS dr. M. Hoesin Palembang
Setiabudi, Wahyu
Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro, Semarang
Anam, Choirul
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
An examination of consistency of CT numbers and its uniformity due to variation of the tube voltage has been done. The examination was conducted using water and polyethyelene phantoms as a test object. The method of scanning, which are axial scanning and helical scanning. The scanning was taken 5 (five) slices with slice thickness of 5 mm. Variations in tube voltage used were 80 kV, 120 kV and 140 kV. The tube current 160 mA and time scanning 2 seconds. It was obtained that the increase in voltage from 80 kV to 140 kV led to increase the value of CT number both for water and polyethylene phantoms. The uniformity of CT number for all ROI varies, but still within the range of tolerance limits. The CT number for the water phantom does not exceed 0 ± 5 HU and for polyethylene phantom does not exceed -300 to -100 HU..
Keywords: CT Scan, CT number, uniformity, tube voltage (kV)
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
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JURNAL SAINS DAN MATEMATIKA; Volume 20 Issue 3 Year 2012
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8028
2015-09-19T16:51:05Z
sm:Art
"150109 2015 eng "
0854-0675
dc
Fusi Protoplas Interspesies Chlorella pyrenoidosa dan Dunaliella salina
Yunanto, Yudi
Laboratorium Genetika Jurusan Biologi, Fakultas Sains & Matematika, Universitas Diponegoro
Tembalang, Semarang – 50275
Telepon (024) 7474754; Fax. (024) 76480690
Kusumaningrum, Hermin Pancasakti
Laboratorium Genetika Jurusan Biologi, Fakultas Sains & Matematika, Universitas Diponegoro
Tembalang, Semarang – 50275
Telepon (024) 7474754; Fax. (024) 76480690
Pujiyanto, Sri
Laboratorium Mikrobiologi Jurusan Biologi, Fakultas Sains & Matematika, Universitas Diponegoro
Tembalang, Semarang – 50275
Telepon (024) 7474754; Fax. (024) 76480690
Microalgae Chlorella pyrenoidosa and Dunaliella salina have been used as natural aquaculture food supplement because the previous contains 60,5% proteins and 180,8 mg/100g β-carotene and the other were accumulated β-carotene by 95% from their total carotenoid. Carotenoid production can be improved by protoplast fusion technique. The aim of the research was conducted protoplast fusion of from C. pyrenoidosa and D. salina in order to gaining boarder salinity spectrum for natural aquaculture food supplement . The research metodology consist of protoplast isolation followed by protoplast fusion process induced by PEG6000 and regeneration of fusant. Protoplast fusion was done in three different PEG incubation time that are 15, 30 and 45 minutes. The fusants were grown in 2 different medium, sea water media and fresh water media. Research result shows that optimal fusion incubation time with PEG6000 is at 30 minutes. Fusant can grown in both medium and revealed higher β-carotene contents 2,008 µg/ml comparing with their parents.
Keywords: Protoplast fusion, Chlorella pyrenoidosa, Dunaliella salina, β-carotene.
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
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https://ejournal.undip.ac.id/index.php/sm/article/view/8028
JURNAL SAINS DAN MATEMATIKA; Volume 21 Issue 1 Year 2013
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/7907
2015-09-19T16:57:18Z
sm:Art
"141219 2014 eng "
0854-0675
dc
Produksi Ion Nitrogen dalam Reaktor Plasma Lucutan Pijar Korona Konfigurasi Multi Titik Bidang dan Pemanfaatan untuk Pengayaan Nitrogen pada Pupuk Kompos
Nur, Muhammad
Devisi Aplikasi Plasma, Laboratorium Fisika Atom dan Nuklir Jurusan Fisika, Universitas Diponegoro
Nugroho, Irfan Wahyu
Devisi Aplikasi Plasma, Laboratorium Fisika Atom dan Nuklir Jurusan Fisika, Universitas Diponegoro
Muchlisin, Zaenul
Devisi Aplikasi Plasma, Laboratorium Fisika Atom dan Nuklir Jurusan Fisika, Universitas Diponegoro
LatifNitrogen ions have been generated in the air by corona glow discharge plasma. The, Sjafrul
Pusat Penelitian Kelapa Sawit, Medan, Sumatra Utara
Nitrogen ions have been generated in the air by corona glow discharge plasma. The unipolar current sturation of Sigmond has been observed and nitrogen ions were used for enrichment of nitrogen in compost of palm oil empty fruit bunches. Generator of ions was a positive corona discharge plasma with multi point to plane electrodes configurations and by using a DC voltage source of 6.8 kV and 8 mA. In the glow discharge plasma condition, the nitrogen ions were produced in air. Implantation of nitrogen ions can increase the levels of nitrogen in the compost. The highest percentage of nitrogen is obtained in the series of experiment for time of radiation was 100 minutes. The amount of mass percentage of nitrogen in the enrichment compost was (3.4 ± 0.3) % and we compare with compost control without ions radiation was 1.1 % (mass percentage). It can be concluded that the increasing of nitrogen content in the compost can be done by almost 300 % .
Key words : corona glow discharge plasma, compost, nitrogen ionic
JURNAL SAINS DAN MATEMATIKA
2014-03-11 00:00:00
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https://ejournal.undip.ac.id/index.php/sm/article/view/7907
JURNAL SAINS DAN MATEMATIKA; Volume 19 Issue 2 Year 2011
eng
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oai:ojs.ejournal.undip.ac.id:article/3116
2015-09-30T15:47:00Z
sm:Art
0854-0675
dc
PENENTUAN TOTAL ANTOSIANIN DARI KELOPAK BUNGA ROSELA (Hibiscus sabdariffa L) DENGAN METODE MASERASI DAN SOKSHLETASI
Suzery, Meiny
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Lestari, Sri
Universitas Diponegoro
Cahyono, Bambang
Organic Chemistry Laboratory, Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University, Semarang Jalan Prof. Soedarto, Tembalang, Semarang 50275, Telepon +62-24-7474754
ABSTRAK-- Rosela (Hibiscas sabdarffi L.) merupakan salah satu tanaman yang mengandung zat wama antosianin. Tujuan dari penelitian ini untuk mengetahui pengaruh metode ekstraksi terhadap total antosianin rosela (Hibiscas sabdariffa). Dalarn penelitian ini dilakukan ekstraksi pigmen antosianin melalui metode maserasi 5oC, 25oC dan soxhletasi, penentuan panjang gelombang maksimum ekstrak hasil isolasi dan penentuan total antosianin. Dari penelitian yang sudah dilakukan terhadap ekstrak bunga rosela (Hibiscus sabdarffi L.) didapatkan rendemen dari maserasi 5oC sebesar 75,1%, maserasi 25oC sebesar 17,7%, dan soxhletasi sebesar 10,4%. Pengukuran λmax menunjukan bahwa panjang gelombang maksimum eksfak etanol hasil maserasi 5oC, 25oC dan boxhletasi sebesar 545 nm. Metode maserasi 5oC menghasilkan total antosianin sebesar 77,26mg/100g, maserasi 25oC sebesar 128,76mg/100g dan soxhletasi sebesar 86,83mg/100g. Hasil keseluruhan menunjukan metode yang paling efektif untuk mengeksfaksi pigmen antosianin rosela adalah dengan metode maserasi 25oC karena memberikan rendemen ekstak dan total antosianin paling tinggi.
Kata kunci: rosela, pigmen antosianin, maserasi, soxhletasi
Permalink : http://ejournal.undip.ac.id/index.php/sm/article/view/3116
JURNAL SAINS DAN MATEMATIKA
2010-01-01 00:00:00
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JURNAL SAINS DAN MATEMATIKA; Volume 18 Issue 1 Year 2010
eng
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oai:ojs.ejournal.undip.ac.id:article/8997
2016-05-02T09:56:18Z
sm:Art
"140715 2014 eng "
0854-0675
dc
Solving a system of linear equations by QR Factorization Method for Temperature and Altitude Regression Model against Spontaneous-Potential
Widowati, Widowati
Mathematics Department, Faculty of Sciences and Mathematics, Dipongoro University
Setyawan, Agus
Diponegoro University
Mustafid, Mustafid
Diponegoro University
Nur, Muhammad
Diponegoro University
Sudarno, Sudarno
Diponegoro University
Harmoko, Udi
Diponegoro University
Adhy, Satriyo
Diponegoro University
Gunawan, Gunawan
Diponegoro University
Subagio, Agus
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Tjahjana, Heru
Diponegoro University
Sulpiani, Ririn
Diponegoro University
Riyanto, Djalal Er
Diponegoro University
Suhartono, Suhartono
Diponegoro
Mukid, Mochammad Abdul
Diponegoro University
Suseno, Jatmiko Endro
Diponegoro University
Many real problems can be represented in the form of multiple linear regression equation. One of those is the relationship between the variables of temperature and altitude of the spontaneous-potential. In order to determine the parameters of the regression equation, the least squares method was used. From here, there was obtained the system of linear equations. In this paper, to solve systems of linear equations, the exact method was used as the exact solution is certainly better than the approached solution. The method used was the QR factorization method. At the QR factorization, the system of linear equations was written in form of matrix equation. Then, the coefficient matrix which the number of rows is m and number of columns is n with linearly independent columns was factored into the matrix Q which has the same size with the matrix A, with orthonormal columns and matrix R was upper triangular. Furthermore, by backward substitution, it could be obtained the exact solution of linear equation system. As verification of this proposed method, a case study was given using data of temperature, altitude, and spontaneous-potential in the geothermal manifestations area, Gedongsongo, Mount Ungaran Semarang. From here, it was obtained the parameters of exact multiple linear regression model which states the relationship between temperature and altitude toward the spontaneous-potential.
JURNAL SAINS DAN MATEMATIKA
2014-07-15 00:00:00
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https://ejournal.undip.ac.id/index.php/sm/article/view/8997
JURNAL SAINS DAN MATEMATIKA; Volume 22 Issue 3 Year 2014
eng
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oai:ojs.ejournal.undip.ac.id:article/3229
2015-09-19T17:05:26Z
sm:Art
0854-0675
dc
PREDIKSI BATAS CEKUNGAN JAWA TIMUR UTARA DENGAN PEGUNUNGAN SELATAN DI DAERAH MAGETAN - PLAOSAN DENGAN METODE GRAVITASI
Wijayanti, Dewi
Universitas Diponegoro
Yulianto, Rr. Tony
Universitas Diponegoro
Nurwidyanto, M. Irtem
Universitas Diponegoro
ABSTRACT-Geophysics investigation with the gravity method to antisipate the existence of boundary of North East Java Basin with the South Mountains in Magetan - Plaosan have been done at 2 – 11 December 2004 by using gravitymeter La Coste & Romberg type G-I177, and resulted 50 station. Data measured field is the observation gravitation position height and terrain conection for A until D zone. To obtain the complete Bouguer anomaly, reduction of field data was performed with standart correction. Bouguer density of rock is obtained 2,30 gram/cm3. Regional and residual anomaly was obtained from filtering of complete bouguer anomaly by using polynomial surface fitting. The quantitative analysis of second order residual anomaly was performed by using Grav2DC for windows. The modelling resulted Lawu lava with density 2,35 gram/cm3 and culminate deepness is 300 m, Tuf Jobolarangan with density 2,20 gram/cm3 and culminate deepness is 300 m, sediment rock with density 2,10 gram/cm3 and culminate deepness is 123,84 m, Igneous rock with density 2,70 gram/cm3 and culminate deepness is 1.721,53 m. Basin boundary marked with the exsistence of sediment rock and igneous rock in subsurface of the area. Interpretdion of modelling indicate that Magetan - Plosan area anticipated to represent the south boundary of North East Java Basin with the South Moantains.
Keynotes : Gravity, terrain correction, Bougeur anomaly
JURNAL SAINS DAN MATEMATIKA
2009-01-01 00:00:00
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https://ejournal.undip.ac.id/index.php/sm/article/view/3229
JURNAL SAINS DAN MATEMATIKA; Volume 17 Issue 1 Year 2009
eng
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oai:ojs.ejournal.undip.ac.id:article/9170
2015-09-30T15:50:15Z
sm:Art
"150415 2015 eng "
0854-0675
dc
Whey Tahu sebagai Penghasil Biolektrisitas pada Sistem Microbial Fuel Cell dengan Lactobacillus Plantarum
Ismawati, Nur
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Aminin, Agustina L. N.
Biochemistry Laboratory, Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Suyati, Linda
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Bioelectricity of soy whey in Microbial Fuel Cell system with Lactobacillus plantarum has been performed. This study aims to determine the capacity of soy whey as a substrate in the MFC system and determine the influence of the speed of agitation against potential difference generated. The potential difference compared to different substrates, namely soy whey, glucose and lactose. Determination of the potential difference in speed variation agitation performed with variations 30, 60, 90, 125 and 250 rpm. The potential difference at the maximum voltage variation of the substrate obtained by soy whey by 33.3 mV / 100 mL at the 15th hour, whereas glucose and lactose reaches the maximum potential difference at the 12th hour with a relatively similar value. Agitation speed that generates the highest potential difference in soy whey substrate was obtained at 90 rpm with maximum potential difference of 63.1 mV / 100mL at the 14th hour.
JURNAL SAINS DAN MATEMATIKA
2015-09-19 00:00:00
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https://ejournal.undip.ac.id/index.php/sm/article/view/9170
JURNAL SAINS DAN MATEMATIKA; Volume 23 Issue 2 Year 2015
eng
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oai:ojs.ejournal.undip.ac.id:article/3267
2015-09-19T17:10:19Z
sm:Art
0854-0675
dc
Pengaruh Medan Listrik Luar Terhadap Sudut Putar Polarisasi Sinar Laser Pada Gliserin
Perwirawati, Linda
Undip
ABSTRACT ---Nonlinear optical properties of glycerin solution with various concentration in the external electrics field has been studied. Optical properties studied here is rotation of direction electrics fields from red diode laser ray which transmition because external electrics field at sucrose and glycerin solution. The result of the experiment shows that change of linear polarization angle proportional to external electrics field and concentration. The change of linear polarization angle of sucrose solution is greater than glycerin solution, The applied small parallel plates show that change of linear polarization angle of light is more optimal than in big parallel plates.
Keywords : external electrics field, non-linear optics, polarization, polarization angle
JURNAL SAINS DAN MATEMATIKA
2012-04-20 00:00:00
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JURNAL SAINS DAN MATEMATIKA; Volume 15 Issue 2 Year 2007
eng
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oai:ojs.ejournal.undip.ac.id:article/3384
2015-09-19T17:02:38Z
sm:Art
0854-0675
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Penentuan Komposisi Asam Lemak Ekstrak Minyak Ikan Kembung (Rastrelliger kanagurta) dengan GC-MS dan Uji Toksisitasnya Menggunakan Metode BSLT
Wibawa, Pratama Jujur
Undip
Listiorini, Dwi
Undip
Fachriyah, Enny
Undip
ABSTRAK---Minyak ikan Kembung dapat diperoleh sebanyak kurang lebih 9,03 % v/b melalui proses ekstraksi sokshlet menggunakan pelarut kloroform. Komposisi asam lemak penyusun minyak ikan ini ditentukan dengan menggunakan instrumen GC-MS (Gas Chromatography-Mass Spectrometry) dan toksisitasnya di uji terhadap Artemia salina Leach dengan metoda BSLT. Data GC-MS menunjukkan adanya 5 asam lemak mayor yang terkandung di dalam minyak ikan ini, yaitu asam miristat (17,86%), palmitoleat (19,96%), palmitat (20,16%), oleat (21,99%) dan stearat (22,19%). Sedangkan dari uji toksisitas menggunakan metode BSLT, diperoleh nilai LC50 ekstrak minyak ikan sebesar 5,97 ppm.
Kata kunci: minyak ikan Kembung, ekstrak minyak ikan, minyak ikan mentah, asam lemak
JURNAL SAINS DAN MATEMATIKA
2006-10-04 00:00:00
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JURNAL SAINS DAN MATEMATIKA; Volume 14 issue 4 Year 2006
eng
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oai:ojs.ejournal.undip.ac.id:article/7905
2015-09-30T13:06:25Z
sm:Art
"141219 2014 eng "
0854-0675
dc
Pemurnian DNA Plasmid Puc19 Menggunakan Kolom Silika dengan Denaturan Urea
Aini, Annisa Nur
Jurusan Kimia, Fakultas Sains dan Matematika, Universitas Diponegoro Semarang
Sarjono, Purbowatiningrum Ria
Biochemistry Laboratory, Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Aminin, Agustina L. N.
Biochemistry Laboratory, Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Pemurnian DNA plasmid berbasis silika didasarkan pada fakta bahwa DNA dapat dimurnikan menggunakan fase padat seperti silika dengan adanya denaturan. Adsorpsi DNA pada permukaan silika merupakan alternatif metode pemurnian yang efektif dan efisien dibandingkan metode pemurnian konvensional. Prinsip metode ini adalah pengikatan molekul air oleh denaturan dan adanya ikatan hidrogen antara gugus fosfat DNA dengan gugus silanol (SiOH-) pada permukaan silika. DNA plasmid pUC19 diisolasi dari sel inang E.coli JM109 menggunakan metode lisis alkali dan dimurnikan dengan dua metode, yaitu ekstraksi fenol-khloroform dan kolom silika. Hasil kemurnian DNA plasmid menggunakan kolom dengan silika 5 mg pada konsentrasi urea 6 M sebesar 1,36. Nilai tersebut lebih tinggi dibandingkan hasil pemurnian dengan ekstraksi fenol:kloroform-isoamil alkohol yaitu sebesar 1,28. Variasi konsentrasi urea 5-9 M pada kolom dengan silika gel 5 mg dan 25 mg digunakan untuk mengetahui profil kapasitas urea sebagai agen denaturan pada pemurnian DNA plasmid. Hasil analisis secara spektrofotometri menunjukkan nilai kemurnian DNA plasmid pada konsentrasi urea 6-8 M berada pada kisaran 1,33 dan 1,48. Konsentrasi DNA plasmid tertinggi diperoleh pada kolom silika gel 25 mg dengan urea 8 M, sebesar 645 μg/mL.
Keywords: DNA plasmid, pemurnian, kolom silika gel, denaturan, urea
JURNAL SAINS DAN MATEMATIKA
2014-03-11 00:00:00
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JURNAL SAINS DAN MATEMATIKA; Volume 19 Issue 2 Year 2011
eng
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oai:ojs.ejournal.undip.ac.id:article/7994
2015-09-19T16:56:38Z
sm:Art
"150107 2015 eng "
0854-0675
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Deposisi Nanopartikel Titanium Dioksida (Tio2) di atas Gelas Transparan Konduktif dan Aplikasinya sebagai Elektroda Kerja pada Sel Surya Berbasis Dye (DSSC)
Wahyudi, Bayu
Jurusan Fisika, Fakultas Sains Dan Matematika, Universitas Diponegoro
Jl. Prof. Soedarto Semarang, Jawa Tengah, Indonesia Telp. (024) 70790933
Widiyandari, Hendri
Jurusan Fisika, Fakultas Sains Dan Matematika, Universitas Diponegoro
Jl. Prof. Soedarto Semarang, Jawa Tengah, Indonesia Telp. (024) 70790933
Untuk mengantisipasi krisis energi beberapa dekade ke depan ini, sel surya tersensitasi zat pewarna (dye) telah dipertimbangkan sebagai salah satu sumber energi terbarukan yang sangat potensial. Dalam penelitian ini, telah berhasil dibuat elektroda aktif dari nanopartikel TiO2 yang dideposisikan diatas gelas transparan konduktif TCO dengan metode Doctor blade. Nanopartikel TiO2 yang telah dideposisikan kemudian dikarakterisasi menggunakan SEM (scanning electron microscopy) untuk mengetahui sruktur morfologi permukaan. Performa fotovoltaik dari sel surya DSSC telah diukur berdasarkan nilai voltase sirkuit terbuka (Voc) dan dikorelasikan terhadap rapat arus sirkuit pendek (Jsc) . Dari hasil pengujian terhadap performa DSSC diperoleh efisiensi maksimum dengan Voc = 0.68 V dan Jsc= 4.34 mA/cm2.
Kata kunci: DSSC, nanopartikel TiO2, metode Doctor blade, fotovoltaik, efisiensi konversi
JURNAL SAINS DAN MATEMATIKA
2014-03-24 00:00:00
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JURNAL SAINS DAN MATEMATIKA; Volume 19 Issue 4 Year 2011
eng
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oai:ojs.ejournal.undip.ac.id:article/8033
2015-09-30T13:05:18Z
sm:Art
"150109 2015 eng "
0854-0675
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Isolasi dan Karakterisasi Selulase dari Bakteri Selulolitik Termofilik Kompos Pertanian Desa Bayat, Klaten, Jawa Tengah
Alam, Moch Syaiful
Jurusan Kimia, Fakultas Sains dan Matematika, Universitas Diponegoro
Sarjono, Purbowatiningrum Ria
Biochemistry Laboratory, Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Aminin, Agustina L. N.
Biochemistry Laboratory, Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Hidrolisis selulosa secara enzimatik dilakukan oleh selulase. Selulase termostabil lebih disukai oleh industri karena mempunyai aktifitas optimum pada suhu tinggi dan tahan kontaminan. Selulase termostabil dapat diisolasi dari bakteri yang berasal dari kompos termofilik. Penelitian ini bertujuan mendapatkan isolat bakteri selulolitik termofilik dari kompos pertanian fase termofil, mendapatkan selulase termostabil dan mendapatkan data karakteristik selulase termostabil yang meliputi pH dan suhu optimum. Hasil penelitian mendapatkan dua isolat bakteri selulolitik (KB dan KK), dimana isolat KB relatif lebih optimal tumbuh dibanding KK. Unit aktifitas spesifik selulase tertinggi isolate KB didapatkan pada 20-40% amonium sulfat sebesar 5,539 unit/mg, dengan aktifitas optimum pada suhu 55 oC dan pH 8.
Kata kunci: selulase, bakteri selulolitik, kompos termofilik
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
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https://ejournal.undip.ac.id/index.php/sm/article/view/8033
JURNAL SAINS DAN MATEMATIKA; Volume 21 Issue 2 Year 2013
eng
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oai:ojs.ejournal.undip.ac.id:article/2962
2015-09-30T15:55:52Z
sm:Art
0854-0675
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SOLUSI PERIODIK DARI PERSAMAAN KORTEWEG de VRIES (KdV) DENGAN OPERATOR BILINIER HIROTA
Rubiyanti, Sri
Program Studi Matematika Jurusan Matematika FMIPA UNDIP
Sutimin, Sutimin
Mathematics Department, Faculty of Sciences and Mathematics, Diponegoro University
Abstract. Hirota bilinear operator (Hirota Method) is proposed to directly construct periodic wave solutions from Korteweg de Vries (KdV) equation. This solution can be expressed in terms of Jacobi Theta 4 (Θ4) functions, with dispersion relation yielded from degradation of biliear equation. Then, sinusoidal wave, Solitary, and Cnoidal can be reduced from this solution to asses certain of nome (q).
Key words: Hirota Bilinear operator, Korteweg de Vries (KdV) equation, periodic profil gelombang khusus seperti gelombang
Cnoidal dan Solitary.
Permalink : http://ejournal.undip.ac.id/index.php/sm/article/view/2962
JURNAL SAINS DAN MATEMATIKA
2010-07-03 00:00:00
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https://ejournal.undip.ac.id/index.php/sm/article/view/2962
JURNAL SAINS DAN MATEMATIKA; Volume 18 Issue 3 Year 2010
eng
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oai:ojs.ejournal.undip.ac.id:article/8035
2015-09-19T16:49:23Z
sm:Art
"150109 2015 eng "
0854-0675
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Pengendalian Wideng (Sesarma spp) sebagai Hama melalui Pendekatan Ko-manajemen Studi Kasus di Tambak Desa Tapak Tugurejo, Semarang
Hidayat, Jafron W.
Jurusan Biologi Fakultas Sains dan Matematika Universitas Diponegoro Semarang
Kawasan hutan mangrove mengalami tekanan dan perusakan yang serius, sehingga harus direhabilitasi dengan penghijauan. Gangguan yang penting dalam penghijauan diantaranya adalah hama wideng (Sesarma spp). Wideng menyerang bibit dan tanaman mangrove serta membuat lubang pada pematang tambak. Hal tersebut menyebabkan program wanamina kurang diterima masyarakat. Perlu dilakukan pengelolaan sedemikian rupa populasi wideng dapat ditekan/ dikurangi secara buatan dengan melibatkan masyarakat. Oleh karena itu perlu dilakukan penelitian pengendalian wideng melalui pendekatan co-manajemen. Tujuan penelitian adalah mengetahui kegiatan masyarakat yang berkaitan dengan kegiatan penghijaun dan antisipasi teknis terhadap gangguan hama wideng. Penelitian juga ditujukan untuk mengidentifikasi potensi pengendalian alternatif yang memungkinkan. Penelitian dilakukan di desa Tapak Tugurejo, Semarang. Objek kajian difokuskan pada masyarakat yang memiliki kepedulian terhadap konservasi hutan mangrove. Data penelitian diperoleh dengan menggunakan questioner dan interview mendalam terhadap anggota kelompok masyarakat serta menggunakan sejumlah dokumen dan pustaka. Data dianalisis secara deskriptif eksploratif menggunakan data yang disajikan dalam tabel. Hasil penelitian memperlihatkan bahwa kelompok masyarakat Desa Tapak telah melakukan berbagai kegiatan teknis untuk penghijauan mangrove dan pengendalian gangguan wideng. Kegiatan meliputi pembuatan petak pembibitan, memisahkan lokasi pembibitan berdasarkan jenis bibit, memproduksi bibit yang lebih tua, menggunakan pestisida organik dan perlindungan propagul. Praktek tersebut belum menjadi pedoman teknis bagi kelompok, hanya bersifat fleksibel sesuai kebutuhan. Kelompok masyarakat masih berpotensi menerapkan pengendalian alternatif, yaitu dengan mengatur waktu dan lokasi tanam, menggunakan bibit yang spesifik secara umur dan jenis, memadukan dengan kegiatan budidaya Scylla spp dan membatasi penangkapan kepiting secara waktu dan tempat. Kombinasi kesemua teknik di atas dapat menekan gangguan hama, melestarikan hutan mangrove dan menghasilkan produk bernilai ekonomi. Ujung akhir dari rangkaian kegiatan teknis tersebut adalah kesejahteraan dan kelestarian lingkungan secara menyeluruh.
Keywords: Pelestarian mangrove, wideng, masyarakat
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8035
JURNAL SAINS DAN MATEMATIKA; Volume 21 Issue 3 Year 2013
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3145
2015-09-19T17:05:57Z
sm:Art
0854-0675
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MIKROANATOMI HEPAR MENCIT (Mus musculus) SETELAH PEMBERIAN KITIN PER-ORAL
Isdadiyanto, Sri
Universitas Diponegoro
ABSTRACT--The objective of the experiment was determines liver microanatomy and diet consumption n the Mus muscalus after give of chitin. This research used completely randomized design. There were fow concentration of chitin, 0 mg chitin per day; 1,3 mg chitin per day; 1,95 mg chitin per day; 2,6 mg chitin per day. Anova was used in data analysis and LSDT test in 57o level. The result of experiment indicated that the chitin was not cause alteration on liver microanatomy.
Keywords: chittin, Mus musculus, liver microanatomy
JURNAL SAINS DAN MATEMATIKA
2010-10-22 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3145
JURNAL SAINS DAN MATEMATIKA; Volume 17 Issue 2 Year 2009
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/9136
2015-09-16T07:41:49Z
sm:Art
"150116 2015 eng "
0854-0675
dc
Geographical classification of Java Tea (Orthosiphon stamineus) from Java Island by FTIR Spectroscopy Combined with Canonical Variate Analysis
Rafi, Mohamad
Chemistry Department, Faculty of Mathematics and Natural Sciences, Bogor Institute of Agriculture
Purwakusumah, Edy Djauhari
Biopharmaca Study Centre, Institute of Research and Community Services, Bogor Institute of Agriculture
Ridwan, Taopik
Biopharmaca Study Centre, Institute of Research and Community Services, Bogor Institute of Agriculture
Barus, Baba
Biopharmaca Study Centre, Institute of Research and Community Services, Bogor Institute of Agriculture
Sutandi, Atang
Biopharmaca Study Centre, Institute of Research and Community Services, Bogor Institute of Agriculture
Darusman, Latifah Kosim
Biopharmaca Study Centre, Institute of Research and Community Services, Bogor Institute of Agriculture
FTIR spectroscopy combined with canonical variate analysis was used for differentiation of java tea (Orthosiphon stamineus) according to their geographical origin. FTIR spectra of all java tea samples were acquired in the mid infrared region (wavenumber range 4000-400 cm-1). Preprocessing signal of FTIR spectra has been carried out prior to canonical variate analysis by standard normal variate. Combination of FTIR spectra in the region 1800-900 cm-1with canonical variate analysis has the power to differentiate java tea samples in terms of geographical origin. The developed method could be used for identification of geographical origin of java tea based on the samples used in this study.
JURNAL SAINS DAN MATEMATIKA
2015-09-16 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/9136
JURNAL SAINS DAN MATEMATIKA; Volume 23 Issue 1 Year 2015
eng
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oai:ojs.ejournal.undip.ac.id:article/3262
2015-09-19T17:09:46Z
sm:Art
0854-0675
dc
Pelarutan Fosfat Anorganik oleh Kultur Campur Jamur Pelarut Fosfat Secara In Vitro
Raharjo, Budi
Undip
ABSTRAK---Fosfat merupakan nutrient essensial yang diperlukan oleh tanaman dalam pertumbuhan dan perkembangannya. Fosfat sebenarnya terdapat dalam jumlah yang melimpah dalam tanah, namun sekitar 95-99% terdapat dalam bentuk fosfat tidak terlarut sehingga tidak dapat digunakan oleh tanaman Upaya untuk mengatasi masalah ini, salah satunya adalah dengan pembuatan pupuk biologi dengan mikroba pelarut fosfat sebagai agen biofertilizer. Penelitian terdahulu, diperoleh isolat jamur pelarut fosfat dari sampel tanah gambut yang sudah teruji kemampuannya dalam melarutkan fosfat. Penelitian ini bertujuan untuk memperoleh perbandingan isolat jamur pelarut fosfat yang tepat untuk digunakan sebagai formula kultur campur agar dapat melarutkan fosfat secara optimal, meningkatkan kemampuan jamur dalam melarutkan fosfat dengan adanya kerja yang sinergis dari jamur-jamur tersebut, menghasilkan pupuk biologi dengan mikroba sebagai agen biofertilizer. Penelitian dilakukan dengan Rancangan Acak Kelompok dengan perlakuan perbandingan isolat jamur pelarut fosfat yaitu kultur jamur tunggal NSJ 1, NSJ 5, NSJ 6, kultur jamur campur NSJ 1-NSJ 5, NSJ 1-NSJ 6, NSJ 5-NSJ 6, NSJ 1-NSJ 5-NSJ 6 dan kontrol. Kontrol perlakuan digunakan medium uji Pikovskaya tanpa inokulasi jamur. Variabel yang diamati meliputi pH medium kultur, total konsentrasi fosfat yang terlarut. Setiap perlakuan diulang sebanyak empat kali. Analisis data yang digunakan analisis sidik ragam (Ansira) dengan taraf kepercayaan 95 % untuk mengetahui perbedaan antar perlakuan. Jika Fhitung> Ftabel dilakukan uji lanjut dengan uji Duncan. Hasil penelitian menunjukkan bahwa aktivitas pelarutan fosfat pada setiap perlakuan perbandingan isolat jamur F1-F7 secara umum terlihat pada perubahan medium Pikovskaya cair yang semula keruh menjadi bening. Aktivitas pelarutan fosfat mulai terlihat pada awal inkubasi (jam ke 0), dengan konsentrasi fosfat terlarut tertinggi 7,87 ppm yang dihasilkan oleh F5 dan terendah 5,33 ppm oleh F3. Konsentrasi fosfat terlarut menunjukkan penurunan setelah inkubasi 24 jam dengan memperlihatkan penurunan pH dari pH kultur awal inkubasi (jam ke 0) yang tidak begitu drastis. Pada inkubasi 48 jam, semua perlakuan mulai menunjukkan kenaikan konsentrasi fosfat terlarut. Penurunan pH pada inkubasi 48 jam ini dikarenakan adanya aktivitas metabolisme yang mensekresi asam organik. Hasil analisis sidik ragam konsentrasi fosfat terlarut pada inkubasi 48 jam, menunjukkan adanya perbedaan nyata (p<0,05) antar perlakuan perbandingan isolat jamur dalam pelarutan fosfat anorganik. Hal ini berarti bahwa formulasi perbandingan isolat jamur F1-F7 mempengaruhi pelarutan fosfat anorganik. Hasil analisis pada inkubasi 48 jam ini memperlihatkan bahwa perlakuan formulasi F7 paling tinggi dalam melarutkan fosfat dan adanya kerja sinergis dalam meningkatkan pelarutan fosfat.
Kata Kunci: Agen biofertilizer, kultur campur, pelarutan fosfat
JURNAL SAINS DAN MATEMATIKA
2012-04-20 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3262
JURNAL SAINS DAN MATEMATIKA; Volume 15 Issue 2 Year 2007
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/10484
2016-05-02T10:44:57Z
sm:Art
"151015 2015 eng "
0854-0675
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Effect of Turmeric (Curcuma domestica Vahl.) Extract on Broiler Blood Cholesterol Levels
Muliani, Hirawati
Biology Department, Faculty of Sciences and Mathematics, Diponegoro University
This study aimed to determine the effect of turmeric extract on blood cholesterol levels of broiler chickens. The material used in this study were 24 male broiler chickens type of CP 707 and acclimated for 1 week. The chickens were then grouped into 4 treatment groups with 6 replicates in each group. The treatments were T0: without treated (control), T1: given the turmeric extract 200 mg/kg/day; T2: given the turmeric extract 400 mg/kg/day; T3: given the turmeric extract 600 mg/kg/day. The Turmeric extract was given in capsule form and treatment was in 6 weeks. The main parameters measured were the chicken blood cholesterol levels. The supporting parameters measured were body weight and feed intake. The data obtained were analyzed by variance analysis with a completely randomized design and Duncan test. The results showed that turmeric extract had no effect on blood cholesterol levels broiler.
JURNAL SAINS DAN MATEMATIKA
2016-05-02 10:45:02
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/10484
JURNAL SAINS DAN MATEMATIKA; Volume 23 Issue 4 Year 2015
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3379
2015-09-19T17:03:10Z
sm:Art
0854-0675
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Penyelesaian Masalah Cauchy Degenerate dengan Mereduksi ke Bentuk Masalah Cauchy Nondegenerate
Hariyanto, Susilo
Undip
ABSTRAK---Dalam artikel ini diselidiki cara mencari penyelesaian masalah Cauchy abstrak degenerate melalui masalah Cauchy abstrak nondegenerate. Permasalahan ini dibicarakan dalam ruang Hilbert H yang dapat dinyatakan sebagai hasil tambah langsung dari Ker M dan (Ran M*)c. Selanjutnya metode ini digunakan untuk menyelesaikan limit nonrelativistik dari persamaan Dirac.
Kata kunci: masalah Cauchy abstrak degenerate, masalah Cauchy abstrak nondegenerate,Persamaan Dirac.
JURNAL SAINS DAN MATEMATIKA
2006-10-04 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3379
JURNAL SAINS DAN MATEMATIKA; Volume 14 issue 4 Year 2006
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/7901
2015-09-30T13:19:42Z
sm:Art
"141219 2014 eng "
0854-0675
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Komunitas Fitoplankton Danau Rawapening
Soeprobowati, Tri Retnaningsih
Biology Department, Faculty of Sciences and Mathematics, Diponegoro University
Suedy, Sri Widodo Agung
Jurusan Biologi FMIPA Universitas Diponegoro
Jalan Prof. Soedarto, SH. Tembalang Semarang 50275
Fitoplankton merupakan produsen primer perairan, sehingga keberadaannya sangat penting untuk tingkatan trofik di atasnya. Komunitas fitoplankton sangat ditentukan oleh kualitas perairan, sehingga fitoplankton dapat digunakan sebagai bioindikator kualitas perairan. Tekanan lahan di bagian hulu merupapan problem utama Danau Rawapening.Volume air Danau Rawapening cenderung menurun sebagai akibat sedimentasi yang cukup tinggi, sehingga mengganggu fungsi utamanya. Penelitian ini bertujuan mengkaji komunitas fitoplankton Danau Rawapening. Pengambilan sampel dilakukan pada 7 lokasi di Danau Rawapening. Identifikasi fitoplankton dilakukan menggunakan SRC dan mikroskup perbesaran 400 – 1.000 kali. Dijumpai 58 spesies fitoplankton dengan dominansi Bacillariophyta. Berdasarkan keanekaragaman fitoplankton, maka ekosistem Danau Rawapening kurang stabil – cukup stabil. Dominannya Aulacoseira granulata mengindikasikan kondisi eutrofik danau. Penelitian perlu dilanjutnya pada musim dan waktu yang berbeda.
Keywords: fitoplankton, Danau Rawapening, eutrofik, bioindikator
JURNAL SAINS DAN MATEMATIKA
2014-03-11 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/7901
JURNAL SAINS DAN MATEMATIKA; Volume 19 Issue 1 Year 2011
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/7996
2015-09-30T13:09:52Z
sm:Art
"150107 2015 eng "
0854-0675
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Penyelesaian Faktorisasi Koprima dengan Algoritma Euclid dan Metode Ruang Keadaan untuk Penentuan Pengendali yang Menstabilkan Sistem
Asmat, Asmat
Jurusan Matematika FMIPA Universitas Diponegoro
Jl. Prof. Soedharto, SH, Semarang 50275
Widowati, Widowati
Mathematics Department, Faculty of Sciences and Mathematics, Dipongoro University
Stability is the main requirement that must be met on the control system. If the plant from the control system is not stable, then the controller C can be searched so that the feedback system becomes internally stable. Let G be a transfer function represented by , where N, M are coprime factorization and element of family of all stable, proper, real rational function. Functions N and M can be found by using Euclidean algorithm and the state space method. Further, we find controller, that satisfy, NX + MY = I, so that the feedback system is internally stable. To verify the proposed method, numerical examples are given.
Keywords: Euclidean algorithm, coprime factorization, state space method, controller, stable
JURNAL SAINS DAN MATEMATIKA
2014-03-24 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/7996
JURNAL SAINS DAN MATEMATIKA; Volume 20 Issue 1 Year 2012
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8030
2015-10-14T09:47:13Z
sm:Art
"150109 2015 eng "
0854-0675
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Pengaruh Konsentrasi Kalium Asetat dan Natrium Asetat terhadap Konduktivitas Elektrolit Padat KMn(2-x)Mgx O2 dan NaMn(2-x)MgxO2
Nuryanto, Rahmad
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Suyati, Linda
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Harjono, Cipto
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Anggrayni, Rahmaniar
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Pembuatan elektrolit padat KMn(2-x)Mgx O2 dan NaMn(2-x)MgxO2 dilakukan dengan metode sol-gel dengan variasi konsentrasi Kalium Asetat dan Natrium Asetat. Kalium Asetat dan Natrium Asetat dengan konsentrasi 0,1 sampai 0,5 masing-masing dicampur dengan larutan Mangan Asetat, Magesium asetat dan asam sitrat. Larutan-larutan tersebut diaduk selama 2 jam, kemudian dievaporasi dengan temperatur 80°C selama 2 jam, selanjutnya dilakukan drying dengan temperatur 175°C dan kalsinasi dengan temperatur 650°C. Hasilnya berupa padatan diuji konduktivitas dan gugusn fungsinya dengan FTIR.
Hasil Penelitian menunjukkan bahwa konduktivitas tertinggi dari elektrolit padat KMn(2-x)Mgx O2 dan NaMn(2-x)MgxO2 diperoleh pada konsentrasi Kalium Asetat 0,1 M dan Natrium asetat 0,1 M. Hubungan antarakonsentrasi(c) dengan konduktivitas (k) untuk KMn(2-x)Mgx O2 adalah c = -64,05 +42,3 dan untuk NaMn(2-x)MgxO2 c = -269,45k +222,85.
Keywords: Elektrolit padat, Sol-gel, KMn(2-x)Mgx O2 , NaMn(2-x)MgxO2, konduktivitas
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8030
JURNAL SAINS DAN MATEMATIKA; Volume 21 Issue 2 Year 2013
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8059
2015-10-14T09:41:58Z
sm:Art
"150113 2015 eng "
0854-0675
dc
Sintesis Dan Karakterisasi Nanopartikel Fotokatalis Tio2 Dengan Doping Tembaga Dan Sulfur Serta Alikasinya Pada Degradasi Senyawa Fenol
Haris, Abdul
Laboratorium Kimia Analitik, Jurusan Kimia FSM, Universitas Diponegoro Jl. Prof. Soedarto SH, Kampus Tembalang, Semarang 50275 (Telepon/fax 024-7474754)
Widodo, Didik Setiyo
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Nuryanto, Rahmad
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Research on synthesis of copper and sulfur-doped TiO2 with sol-gel method has been done. The study was followed by product characterization with XRD and DR UV-Vis spectroscopy. Photocatalist Cu-S TiO2 has been applied in degradation of phenol initiated by energy sources. Cu-S TiO2 synthesis was performed in one reaction step with TiCl4 as precursor, Cu(NO3)2.3H2O, and H2SO4. Calcination step follows in 450 0C within 4 hours. The method result in nanocrystallin anatase material of Cu-S TiO2 of 8.77 nm in size whose band gap of 1.9 eV decrease from former value of 3.2 eV. By the energy level, photocatalytic proces might be conducted after initiating the material with sun light exposure. Evaluation of the Cu-S TiO2 capability in degrading phenol concentration show that after initiating with UV, visible, and sun light within 6 hours the treatment result in decreasing of phenol concentration by 84.24%, 83.74% and 66.26%, respectively.
Keywords: Synthesis, characterization, TiO2, Cu-S TiO2, phenolFC
Telah dilakukan sintesis fotokatalis TiO2 dengan doping tembaga dan sulfur dengan metode sol gel dan karakterisasinya menggunakan X-RD dan DR UV-Vis. Fotokatalis Cu-S TiO2 terhasil diaplikasikan pada degradasi senyawa fenol menggunakan berbagai energi foton.
Sintesisi Cu-S TiO2 dilakukan dalam satu tahap reaksi menggunakan prekrusor TiCl4, Cu(NO3)2.3H2O, H2SO4 dan kalsinasi dilakukan pada suhu 450oC selama 4 jam.
Dari hasil sintesis diperoleh partikel nanokristalin anatase Cu-S TiO2 dengan ukuran kristal 8,77 nm, dan menurunkan band gap TiO2 anatase dari 3,2 eV menjadi 1,9 eV sehingga dapat diaplikasikan pada sinar matahari. Dari uji fotokatalisis pada degradasi senyawa fenol pada sinar UV, sinar tampak dan sinar matahari selama 6 jam, berturut turut diperoleh penurunan konsentrasi fenol sebesar 84,24%, 83,74% dan 66,26%.
Kata kunci : sintesis, karakterisasi, TiO2, Cu-S TiO2, fenol
JURNAL SAINS DAN MATEMATIKA
2014-04-16 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8059
JURNAL SAINS DAN MATEMATIKA; Volume 22 Issue 2 Year 2014
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8008
2015-09-21T08:58:33Z
sm:Art
"150108 2015 eng "
0854-0675
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Isolasi Komunitas Bakteri Termofilik Selulolitik dari Kompos Serta Identifikasi Fenotipik dan Genotipik dengan Metode Sscp
Al Bashori, Khamdan Ali
Jurusan Kimia, Fakultas Sains dan Matematika, Universitas Diponegoro, Semarang
Mulyani, Nies S.
Jurusan Kimia, Fakultas Sains dan Matematika, Universitas Diponegoro, Semarang
Aminin, Agustina L. N.
Biochemistry Laboratory, Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Bioetanol sebagai sumber energi alternatif baru dapat dihasilkan dari degradasi selulosa secara enzimatis. Proses enzimatis degradasi selulosa menggunakan enzim termostabil yang dihasilkan oleh bakteri termofilik selulolitik. Kompos diketahui merupakan habitat alami bakteri termofilik selulolitik. Eksplorasi sumber bakteri baru penghasil enzim selulase termostabil untuk mengoptimalkan potensi kompos. Isolasi bakteri termofilik selulolitik dari kompos dan identifikasi fenotipik dan genotipik untuk mengetahui profil dan perkiraan jumlah bakteri dari komunitas bakteri telah dilakukan. Hasil penelitian diperoleh isolat komunitas bakteri termofilik selulolitik kompos yang mampu tumbuh pada media CMC. Identifikasi fenotipik menghasilkan lima kenampakan koloni bakteri serta tiga bentuk morfologi bakteri. Data SSCP menunjukkan tiga profil komunitas bakteri dan ada sekitar sembilan spesies yang tumbuh baik pada media CMC. Korelasi kedua identifikasi membuktikan bahwa adanya komunitas bakteri termofilik penghasil enzim selulase pada kompos termofilik.
Kata kunci: bakteri selulolitik, kompos termofilik, SSCP
JURNAL SAINS DAN MATEMATIKA
2014-03-25 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8008
JURNAL SAINS DAN MATEMATIKA; Volume 20 Issue 2 Year 2012
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3140
2015-09-21T08:49:35Z
sm:Art
0854-0675
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ANALISIS KUANTITATIF B-KAROTEN DAN UJI AKTTVITAS KAROTENOID DALAM ALGA COKLAT TURBINARIA DECURRENS
Biranti, Fransisca
Universitas Diponegoro
Nursid, Muhammad
Balai Besar Riset Pengolahan Produk dan Bioteknologi Kelautan dan Perikanan
Cahyono, Bambang
Organic Chemistry Laboratory, Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University, Semarang Jalan Prof. Soedarto, Tembalang, Semarang 50275, Telepon +62-24-7474754
ABSTRACT---One of the Indonesian marine natural resources, brown alga of Turbinaria decurrens, used in pharmacy in order of carotenoid pigment as antioxidant. We interested in analysis B-caroten in Turbinaria decurrens and antioxidant and anti-tumor activity. The method that is use to divide carotenoid is the hierarchy maseration method using n-hexane, ethyl acetate and methanol and then using chromatography column. To analyze the qualitative carotenoid uses HPLC by Crc column and eluen
methanol-acetonitrile (3:I). Meanwhile, the test of bioactivity carotene uses radical DPPH (1I'difenil-2-
pibilhidrozil) to test of antioxidant qnd sitotoksik asscy with MTT [3,(4,5-dimethylthiazol-2yl)-2,5-
diphenyltetrcaolium bromideJ for HeLa tumor cells to test of anti-tumor. The result of this research is B -
caroten thqt is in qctract has 0.00387%. Moreover, bioacttvity test shows that B -caroten fraction does not
active to neutralize of DPPHfree radical than ascorbic aci{ but it shows the acttvity to kill HeLa tumor cells.
Keywords : Turblnaria decunens, Carolenoid, Antioksidan, Antitumor
JURNAL SAINS DAN MATEMATIKA
2010-10-22 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3140
JURNAL SAINS DAN MATEMATIKA; Volume 17 Issue 2 Year 2009
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/9004
2015-08-30T15:47:41Z
sm:Art
"141015 2014 eng "
0854-0675
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The Antioxidant Growth and Potency of Yeast Rhodosporidium paludigenum DUCC Y-007 on Different Mediums
Kusdiyantini, Endang
Diponegoro University
Budiharjo, Anto
Diponegoro University
The antioxidant growth and potency of yeast Rhodosporidium paludigenum DUCC Y-007 have been studied on two treatment mediums. The yeast could grow on two treatment mediums and the dry weight results obtained during the incubation period of 120 hours were 7.17 g/L and 7.33 g/L. The concentration of reducing sugars in stabilized medium were 3.14 g/L and 3.30 g/L at 72-120 hours incubation time respectively. There were differences in pH changes during incubation time which at YPG medium, it tended to increase whereas at semi synthetic medium, the pH tended to decline. Total carotenoid on YPG medium was 50.13 µg/g cell and on the semi-synthetic medium was 197.50 µg/g cell. Antioxidant activity measured by DPPH reagent showed the results at YPG medium was 50% and at semi-synthetic medium was 61%.
JURNAL SAINS DAN MATEMATIKA
2015-08-30 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/9004
JURNAL SAINS DAN MATEMATIKA; Volume 22 Issue 4 Year 2014
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3257
2015-10-14T08:25:22Z
sm:Art
0854-0675
dc
Identifikasi Unsur-Unsur Berdasarkan Spektrum Emisi Menggunakan Jaringan Syaraf Tiruan
Prasetyo, Eko
UNDIP
Azam, Muchammad
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Suseno, Jatmiko Endro
UNDIP
ABSTRACT---Neural network program for elements identification based on its emission spectrum has been made using backpropagation method. The programming language which was used is MATLAB 7.0. This neural network has a single hidden layer. Training and testing data are emission spectrum data which are emission wavelength from each element. Training process was done by introducing known emission spectrum data to neural network program. Neural network program has been successful to identify elements based on its emission spectrum. Training process will be faster if we adjust the number of hidden layer’s neuron as 100, the value of learning rate as 0,049 and the value of momentum as 0,98. The neural network accuracy of identifying elements is determined by the value of error target. Error target. The value of target error about 10-2 has accuracy 97,14% and the value of target error about 10-4 has accuracy 100%.
Keywords: Neural network, backpropagation method, and emission spectrum
JURNAL SAINS DAN MATEMATIKA
2007-01-01 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3257
JURNAL SAINS DAN MATEMATIKA; Volume 15 Issue 1 Year 2007
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/9274
2015-10-14T09:33:37Z
sm:Art
"150715 2015 eng "
0854-0675
dc
Design of Non-Invasive Glucometer using Microcontroller ATMega-8535
Hidayanto, Eko
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Sutanto, Heri
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Arifin, Zaenal
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Symptoms of Diabetes Mellitus (DM) or diabetes could be indicated by measuring blood sugar levels in the body. One of the health technology to detect blood sugar in non-invasive is to utilize the absorption of laser light and oxymeter sensor capable of generating a voltage change on a variety of fluid medium. This study has been designed using the blood sugar measuring device microcontroller ATMega 8535 as a minimum system in controlling the value of output in the form of data digital. System/equipment to be fabricated in this study is a non-invasive method (without injuring the patient's body when taking a blood sample) to determine the blood sugar content by exploiting the physical properties of absorption of laser sensors on a variety of blood sugar content. To improve the quality of the test data used 8-bit microcontroller that is capable of separating the output data 256 bits (binary). Each of these bit values can be used to replace manual sensor test results that have analogue voltage output of the data. This analogue data will then be converted to analogue to digital converter (ADC) into digital values are displayed in the liquid crystal display (LCD) that is directly readable by the measured/patients in a short period of time less than 5 minutes. The results of the research can be developed into a national program providing portable medical test equipment is cheap and movable.
Keywords: DM, Blood Sugar, Sensor of Oxymeter, Red Laser, Microcontroller ATMega 8535
JURNAL SAINS DAN MATEMATIKA
2015-10-14 09:33:37
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/9274
JURNAL SAINS DAN MATEMATIKA; Volume 23 Issue 3 Year 2015
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3278
2015-09-19T17:11:01Z
sm:Art
0854-0675
dc
PEMODELAN ANOMALI GRAVITASI DENGAN PENDEKATAN BENDA BERBENTUK SILINDER
Rahmanto, Dedi
Undip
Yulianto, Tony
Undip
ABSTRACT---A gravity anomalies modeling program has been made with the approximation of cylinder shaped body for the case of N anomalous bodies. This program is named DRAVECT version 1.1. The modeling program was executed by Microsoft Visual Basic 6.0 programming language.The program was made by identifying gravity problems. Input and output data that be identified from gravity parameters, dimension and position parameters of anomalous bodies. The gravity anomalies were calculated by inserting synthetic data to the modeling program. The anomaly profiles 3 D were displayed automatically, and the profiles of gravity anomalies 2 D were made respectively. Validation test had been done by compare program result with reference. Based on the graphical qualitative interpretation of gravity anomaly profiles as the result of the conducted modeling, it was obtained the characteristics of gravity anomaly of cylinder shaped body.
Keyword : gravity anomalies, cylinder
JURNAL SAINS DAN MATEMATIKA
2012-04-23 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3278
JURNAL SAINS DAN MATEMATIKA; Volume 17 Issue 3 Year 2009
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/6253
2015-09-30T15:46:30Z
sm:Art
"140226 2014 eng "
0854-0675
dc
TOTAL FENOLAT DAN FLAVONOID DARI EKSTRAK DAN FRAKSI DAUN KUMIS KUCING (Orthosiphon stamineus B.) JAWA TENGAH SERTA AKTIVITAS ANTIOKSIDANNYA
Pratiwi, Putri
Laboratorium Kimia Organik, Jurusan Kimia MIPA, Universitas Diponegoro. Jl. Prof Sudharto, Tembalang
Semarang 50275
Suzery, Meiny
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Cahyono, Bambang
Organic Chemistry Laboratory, Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University, Semarang Jalan Prof. Soedarto, Tembalang, Semarang 50275, Telepon +62-24-7474754
ABSTRAK---Orthosiphon stamineus B (Indonesia: Kumis Kucing) merupakan salah satu tumbuhan sangat popular sebagai sumber pengobatan herbal, pada umumnya dikumpulkan dari pulau Jawa. Aktivitas biologis, terutama akivitas antioksidan yang ditunjukkan oleh tanaman ini diduga disebabkan olehsenyawa golongan fenolat, khususnya senyawa flavonoid. Oleh sebab itu, penelitian ini bertujuan menentukan total fenolat, total flavonoid dan aktivitas antioksidan dari ekstrak metanol beserta fraksi fraksinya dari tanaman kumis kucing yang tumbuh di Indonesia, khususnya di daerah Bandungan, Kabupaten Semarang, Provinsi Jawa Tengah, perlu dilakukan. Secara garis besar, penelitian dibagi menjadi empat tahap, yakni perolehan total ekstrak metanol, diikuti dengan tahap fraksinasi melalui gradien pelarut, kemudian analisis total fenolat dan flavonoid, dan diakhiri dengan analisis aktivitas antioksidan terhadap tiap-tiap ekstrak. Analisis total fenolat dilakukan dengan metode Folin-Ciocalteu, analisis flavonoid dilakukan berdasarkan cara kerja Rohman, dan aktivitas antioksidan ditentukan dengan metode peredaman radikal DPPH.. Hasil penelitian menunjukkan bahwa kandungan total fenolat dan flavonoid terbesar berada dalam ekstrak etil asetat berturut-turut sebesar 559 mg asam galat ekuivalen/g ekstrak dan 3550 mg kuersetin ekuivalen/g ekstrak. Aktivitas antioksidan tertinggi juga dimiliki oleh ekstrak etil asetat dengan nilai EC50 sebesar 51,02 μg/mL. Nilai aktivitas antioksidan yang ditunjukkan oleh semua fraksi dalam daun kumis kucing sangat memungkinkan bahan ini dapat digunakan sebagai sumber antioksidan.
Kata Kunci: kumis kucing, Orthosiphon stamineus, total fenolat, total flavonoid, antioksidan
ABSTRACT---Orthosiphon stamineus B (Lamiaceae) is a popular medicinal herb in South-east Asia, it was originated in Java Island and is well known by name of “Kumis Kucing.”. The biological activityof this plant, especially the antioxidant activity, is caused by the presence of compounds from phenolic group, especially come from flavonoid compounds. Therefore, the aim of this research is to determine total phenolic, total flavonoid and antioxidant activity analysis of methanol extract and its fractions of Orthosiphon stamineus B from Indonesia, especially Bandungan, Kabupaten Semarang, Jawa Tengah. The method of this research is consists of dried leaf extraction by methanolic, partition with solvent gradient, analysis of total phenolic and flavonoid content and antioxidant activity analysis. The total phenolic content analyzed by Folin-Ciocalteau method, total flavonoid content analyzed by Rohman method and antioxidantactivity analyzed by DPPH. radical scavenging method. The result showed that the highest phenolic and flavonoid content is in the ethyl acetate extract with value 559 mg gallic acid equivalent/g extract and 3550mg quercetin equivalent/g extract, respectively. The ethyl acetate has the strongest antioxidant activity with51.02 μg/mL of EC50 value. The finally antioxidant activity is shown in all extract of Indonesian Orthosiphonstamineus B can be used as antioxidant source.
Keywords: Orthosiphon stamineus, kumis kucing, total phenolic, total flavonoid, antioxidant activity
JURNAL SAINS DAN MATEMATIKA
2014-02-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/6253
JURNAL SAINS DAN MATEMATIKA; Volume 18 Issue 4 Year 2010
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8056
2015-09-30T15:49:57Z
sm:Art
"150113 2015 eng "
0854-0675
dc
Studi Pendahuluan Pemanfaatan Whey Tahu sebagai Substrat dan Efek Luas Permukaan Elektroda dalam Sistem Microbial Fuel Cell
Sinaga, David Hamonangan
Jurusan Kimia, Fakultas Sains dan Matematika, Universitas Diponegoro
Suyati, Linda
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Aminin, Agustina L. N.
Biochemistry Laboratory, Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Studi ini bertujuan mengkaji potensi whey tahu sebagai substrat menggunakan Saccharomyces cerevisiae dan mempelajari pengaruh luas permukaan elektroda dalam menghasilkan beda potensial pada sistem MFC. Tahapan penelitian meliputi konstruksi reaktor MFC, pengukuran beda potensial pada variasi substrat yaitu membandingkan beda potensial yang dapat dihasilkan oleh substrat whey tahu dengan substrat glukosa, dan pengukuran beda potensial pada variasi luas permukaan elektroda dengan masing-masing luas permukaan elektroda grafit sebesar 13,29 cm2, 26,58 cm2, 39,87 cm2, dan 53,16 cm2. Hasil penelitian menunjukkan bahwa whey tahu memiliki potensi dengan dihasilkannya beda potensial maksimum 11,73 mV/100 ml substrat dalam sistem MFC menggunakan S. cerevisiae. Hasil studi juga menunjukkan bahwa semakin besar luas permukaan elektroda, semakin besar pula beda potensial yang dihasilkan. Hal ini dibuktikan dengan luas elektroda grafit 53,16 cm2 menghasilkan beda potensial 40,67 mV/100 mL substrat whey tahu dan 300 mV/100 mL substrat glukosa.
Kata kunci: Whey tahu, Microbial fuel cell, Saccharomyces cerevisiae, dual-chamber MFC
The preliminary research about the utilization of soy whey as a substrate and the effect of electrode surface area in microbial fuel cell (MFC) system has been conducted. Laboratory-scale experiment of MFC was carried out in order to determine the ability of soy whey to act as substrate using Saccharomyces cerevisiae and the influence of electrode surface area to generate a potential difference in MFC system. The study includes the MFC reactor design, measuring a potential difference at variation of substrate (soy whey and glucose), and evaluate a potential difference at a variation of graphite electrode surface area. The results show that soy whey has an ability to be applied as a substrate in the MFC system using S. cerevisiae with potential difference 11,73 mV/100 ml. The variation of electrode surface area in the MFC system with four graphite electrodes (53.16 cm2) give the best potential difference with 40,67 mV/100 ml of soy whey and 300 mV/100 ml of glucose substrate.
Keywords: Soy whey, Microbial fuel cell, Saccharomyces cerevisiae, dual-chamber MFC
JURNAL SAINS DAN MATEMATIKA
2014-04-16 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8056
JURNAL SAINS DAN MATEMATIKA; Volume 22 Issue 2 Year 2014
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8019
2018-08-21T07:16:43Z
sm:Art
"150109 2015 eng "
0854-0675
dc
Fotokatalitik ZnO:KA pada Penjernihan Air Kali Banger Semarang
Hidayatuloh, R
Laboratorium Fisika Material, Jurusan Fisika
Fakultas Sains dan Matematika, Universitas Diponegoro,
Jl. Prof. Sudarto, S.H., Tembalang, Semarang 50275
Subagio, Agus
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Nurhasanah, I
Laboratorium Fisika Material, Jurusan Fisika
Fakultas Sains dan Matematika, Universitas Diponegoro,
Jl. Prof. Sudarto, S.H., Tembalang, Semarang 50275
Fotokatalis ZnO yang dikombinasikan dengan karbon aktif (ZnO:KA) digunakan pada proses penjernihan dan penghilang bau busuk air kali Banger. ZnO dilapiskan pada karbon aktif dengan memasukkan karbon aktif ke dalam larutan ZnO, kemudian dipanaskan pada temperatur 100oC selama 3 jam. Mikrostruktur dan komposisi atom ZnO:KA diamati menggunakan scanning electron microscope (SEM) yang terintegrasi dengan energy dispersive x-ray spectroscope (EDX). Citra SEM menunjukkan bahwa ZnO telah berhasil dilapiskan pada permukaan KA. Proses fotokatalis dilakukan pada penjernihan dan reduksi bau busuk air kali Banger dengan pemberian radiasi sinar UV. Fotokatalitik ZnO:KA diuji melalui pengukuran total dissolved solid (TDS) dan biological oxygen demand (BOD). Penurunan TDS air kali Banger yang dijernihkan menggunakan sinar UV dan ZnO:KA lebih rendah dibandingkan dengan media lainnya. Kombinasi antara ZnO dan KA yang disinari UV juga menurunkan BOD air limbah kali Banger. Hasil tersebut menunjukkan bahwa ZnO:KA dapat digunakan untuk proses penjernihan air.
Keywords:ZnO,Karbon Aktif, fotokatalis, penjernihan air, kali Banger
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8019
JURNAL SAINS DAN MATEMATIKA; Volume 20 Issue 4 Year 2012
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8039
2015-09-19T16:48:48Z
sm:Art
"150109 2015 eng "
0854-0675
dc
Identifikasi Faktor-Faktor Penyebab Kejadian Diare Di Kota Semarang Dengan Pendekatan Geographically Weighted Poisson Regression
Yasin, Hasbi
Jurusan Statistika Universitas Diponegoro
Rusgiyono, Agus
Jurusan Statistika Universitas Diponegoro
The percentage of people affected by diarrheal diseases are still quite high, reaching 5.2%. Therefore we need an effort to identify the factors that cause diarrhea efforts of the government in order to reduce morbidity of diarrhea optimally. Such efforts include reviewing of the factors causing the incidence of diarrhea by focusing on linkages between regions or spatial aspects. Spatial aspect is considered important to study because between regions must have different characteristics. One approach that can be used is a spatial model Geographically Weighted Poisson Regression (GWPR) which is a local form of the Poisson Regression. This research was conducted in Semarang city with the unit of observation is the 16 districts in Semarang city. The results showed that the locally influential variable is the number of protected drinking water facilities and the number of medical personnel available. This model has a level of accuracy of 84.33%.
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8039
JURNAL SAINS DAN MATEMATIKA; Volume 21 Issue 3 Year 2013
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/7909
2015-09-30T13:19:44Z
sm:Art
"141223 2014 eng "
0854-0675
dc
Variabilitas Keanekaragaman dan Distribusi Vertikal Diatom Danau Rawa Pening
Soeprobowati, Tri Retnaningsih
Biology Department, Faculty of Sciences and Mathematics, Diponegoro University
Secara spasial, diatom tersebar hampir di semua ekosistem perairan, bahkan di tempat lembab dan basah. Dinding sel diatom tersusun dari silika, sehingga fosil diatom dapat tersimpan dengan baik dalam sedimen. Penelitian ini dilakukan untuk mengkaji variabilitas keanekaragaman diatom Danau Rawa Pening secara vertikal. Perbedaan keanekaragaman dan kemelimpahan diatom pada perlapisan sedimen mengindikasikan perbedaan lingkungan saat diatom tersebut diendapkan.
Sampel sedimen diambil dari 2 lokasi di Danau Rawa Pening, dengan representasi inlet dan tengah danau. Pengambilan sampel dilakukan dengan hand auger. Sampel sedimen dalam corer kemudian diiris tiap 0,5 cm. Diatom dipisahkan dari sedimen dengan perlakukan HCl dan H2O2. Identifikasi diatom dilakukan dengan mikroskup perbesaran 1.000 kali hingga dijumpai minimal 300 valva. Selanjutnya dilakukan penghitungan kemelimpahan relatif dan indeks keanekaragaman Shannon-Wiener. Secara vertikal, keanekaragaman diatom variatif antara 1,49 – 3,49. Rendahnya indeks keanekaragaman berkaitan dengan dominansi spesies. Diatom centrales mendominasi lapisan permukaan dengan populasi relatif tinggi dengan spesies dominan Aulacoseira ambigua, A. distans dan A. granulata. Genus Eunotia mendominasi pada lapisan tengah dan Nitzschia palea dan Synedra ulna mendominasi lapisan dalam. Berdasarkan perbedaan kemelimpahan spesies tersebut mengindikasikan perbedaan kandungan total fosfor dan pH pada saat diatom tersebut diendapkan. Rekonstruksi masa lampau Danau Rawa Pening perlu dilakukan untuk memastikan adanya perubahan kualitas perairannya.
Keywords: diatom, keanekaragaman, Rawa Pening, distribusi vertikal, kualitas perairan
JURNAL SAINS DAN MATEMATIKA
2014-03-14 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/7909
JURNAL SAINS DAN MATEMATIKA; Volume 19 Issue 3 Year 2011
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3117
2015-09-19T17:07:01Z
sm:Art
0854-0675
dc
PENERAPAN SISTEM INFERENSI METODE MIN-MAX DALAM LOGIKA FAZZY UNTUK PENGATURAN TRAFFIC LIGHT
Irawanto, Bambang
Universitas Diponegoro
Kurniawan, Desfri
Universitas Diponegoro
Abstrak---Logika crisp merupakan sistem logika yang hanya mempunyai dua nilai keanggotaan benar atau salah. Dalam implementasinya, terdapat hal-hal yang tidak tepat bila direpresentasikan hanya secara benar dan salah. Karena itu, digunakanlah sistem logika fuzzy dimana terdapat nilai-nilai diantara benar dan salah. Konsep ini banyak diaplikasitan terutama untuk sistem kontrol, salah satunya pada traffic light. Sistem pengaturan traffic light dengan konsep logika fuzzy mampu bekerja sesuai kondisi jalan yang diaturnya. Sistem inferensi fuzzy menggunatan metodi Min-max. Input crisp diubah menjadi input fuzzy, kemudian dievaluasi dengan basis pengetahuan menggunakan kaidah-kaidah fuzzy yang akhirnya dihasilkan sebuah solusi daerah fuzzy. Daerah solusi ini selanjutnya dilakukan defuzzisasi untuk mendapatkan sebuah solusi crisp sebagai dasar penentuan durasi lampu hijau pada traffic light.
Kata kunci : Logika fuzzi, sistem inferensi fuzzy, metode min-max
Permalink : http://ejournal.undip.ac.id/index.php/sm/article/view/3117
JURNAL SAINS DAN MATEMATIKA
2010-01-01 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3117
JURNAL SAINS DAN MATEMATIKA; Volume 18 Issue 1 Year 2010
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8998
2015-09-21T08:56:34Z
sm:Art
"140715 2014 eng "
0854-0675
dc
Jelly Fermented Soy Whey as Antioxidants Source of Alternative Functional Food
Lailiya A, Rizqi Nabilatul
Diponegoro University
Wahyuningsih, Dita
Diponegoro University
Hidayah, Wihda Wihdatul
Diponegoro University
Aminin, Agustina L. N.
Biochemistry Laboratory, Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Soy tofu whey is residual water in the process of tofu manufacturing which is derived from the remaining soy milk clotting. Tofu whey contains bioactive compounds which have been studied previously could be potential as an antioxidant, antimicrobial, anti-mutagenic, and antihypertensive. This study aim was to produce pleasant JF-Soywhey and make society healthy. Manufacturing of JF-Soywhey was conducted through a whey tofu fermentation process using Kefir grains at room temperature (± 28°C) for 48 hours and subsequently processed into jelly. The results showed that the products varied with fruit juice got a favoured by the panellists. In addition, the antioxidant content of products was still quite high as the ripening effects lowered the antioxidant capacity of 13.9%. Hence it could be suggested that the kefir grain fermented tofu whey could be used as an antioxidant source alternative functional food such as JF-Soywhey.
JURNAL SAINS DAN MATEMATIKA
2014-07-15 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8998
JURNAL SAINS DAN MATEMATIKA; Volume 22 Issue 3 Year 2014
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3230
2015-10-14T09:54:28Z
sm:Art
0854-0675
dc
PENGARUH INDUKSI MEDAN RADIO FREQENCY (RF) PADA DIPOL-DIPOL MOLEKUL AIR
Firdausi, Ketut Sofjan
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Kamil, Ahmad
Universitas Diponegoro
Azam, Muchammad
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
ABSTRACT-The non-linear optical property of rotary power of light polarization in water has been develop using the Radio-Freguency field (RF-Field). The RF-Field used in the experiment is produced by RF generator, and it supplies the frequency in the range betwen 6,04 to 14,56 MHz which then applies to the samples. The source of light with 632,8 nm-wavelength and 532 nm-wavelength are used to observe the change of range polarization of the light after it passes througt 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 β. The values of β is measured as a function of RF-Field, , where ωRF 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, η is largest at the E3 mode. It shows also that at small wavelength of light we obtain the larger η, which is indicated the higher frequency of liglt will more induce the dipoles of molecules of the samples.
Keywords: non- linear optics, polarization angle, rotary power
JURNAL SAINS DAN MATEMATIKA
2009-01-01 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3230
JURNAL SAINS DAN MATEMATIKA; Volume 17 Issue 1 Year 2009
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/9171
2015-09-30T15:45:37Z
sm:Art
"150415 2015 eng "
0854-0675
dc
The Antioxidant Activities, Phenolic Total and Cytotoxicity of Extract and Fractions of Aloe Vera Linn)
Prahesti, Nike Rizky
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Suzery, Meiny
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Cahyono, Bambang
Organic Chemistry Laboratory, Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University, Semarang Jalan Prof. Soedarto, Tembalang, Semarang 50275, Telepon +62-24-7474754
Aloe vera is known containing compounds which have potencies as antioxidants, such as group of anthraquinones (especially emodin and aloin), flavonoids, tannins, saponins, and sterols. In this research, comparison of total phenolics content, antioxidant activity and cytotoxicity of the methanolic extract and its fractions had been conducted. The Aloe vera extract was fractionated using a solvent gradient system to obtain fractions of n-hexane, dichloromethane, ethyl acetate and water. The analysis of total phenolic and activity were performed on extracts or fractions that showed a positive result to the phenolic test. Total phenolic content was determined by the Folin - Ciocalteu method, determination of antioxidant activity was by DPPH radical reduction and determination of cytotoxicity was by BSLT (Brine Shrimp Lethality Test). The results showed that the yield of methanol extract, fractions n-hexane, fraction of dichloromethane, ethyl acetate and water fraction were 0.580% ; 0.006% ; 0.093% ; 0.0092% and 0.410% respectively. Methanolic extract, ethyl acetate fraction and the water fraction showed positive result on phenolic test. Total phenolic compounds from water fractions was (16. mg gallic acid equivalent/g extract or fraction) which had greater level than Emet and Fea (12.47 and 0.89). Fraction of water had the highest antioxidant activity (IC50 433 mg/L) compared to Emet (IC50 519.23 mg/L) and Fea (IC50 1311.36 mg/L). All of three samples had cytotoxic potency, water fraction (Fair) was the most active sample (LC50 5.209 ppm) compared to Emet (LC50 18.383 ppm) and Fea (LC50 56.486 ppm). Overall it can be proposed that the water fraction is the most active fraction compared to the other fractions or extracts.
JURNAL SAINS DAN MATEMATIKA
2015-09-19 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/9171
JURNAL SAINS DAN MATEMATIKA; Volume 23 Issue 2 Year 2015
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3268
2015-09-19T17:10:24Z
sm:Art
0854-0675
dc
Identifikasi Minyak Atsiri Biji Kapulaga (Amomum cardamomum)
Fachriyah, Enny
Undip
ABSTRACT---Isolation of essential oil of seed Cardamom had been done by steam distillation. The essential oil product to be determined result rendemen and its physical constant like refractive index and specific gravity. Component analysis were done with chromatography-mass spectrometry (GC-MS).Yielded by clear rust colored essential oil (1.20%) refractive index at temperature 20oC 1.4590 and specific gravity at temperature 25oC 0.9020 g/mL. The result of GC-MS analysis shown there are 5 components of seed cardamom oil. There are α-pinene, ß-pinene, p-cimene, cineol and terpineol
Keywords: essential oil, Cardamom nobilis L. , steam distillation
JURNAL SAINS DAN MATEMATIKA
2012-04-20 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3268
JURNAL SAINS DAN MATEMATIKA; Volume 15 Issue 2 Year 2007
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3385
2015-09-19T17:02:14Z
sm:Art
0854-0675
dc
Pertumbuhan Tongkol Jagung Baby Corn (Zea Mays L.) Varietas Pioneer-11 Setelah Pemberian Kascing
Nurchayati, Yulita
Undip
Yuliana, Titis
Undip
ABSTRACT---An experiment to obtain high productivity of baby corn’s cob by casting treatment has been conducted. The aims of this experiment were to study the casting effect for baby corn productivity and to obtain the efficient dose of casting to increase baby corn productivity. This experiment was done by a Randomized Complete Design with four treatment and seven replication. The treatments were four kinds of casting dose, i.e 0g/plant, 200g/plant, 400g/plant and 600g/plant in their growth media. The measurable parameter were fresh weights, dry weights and cob quantity of baby corn. The casting was analyzed qualitatively including C/N ratio and organic material of casting. The result showed that the casting can increase the cob of baby corn productivity eventhough the efficient doses of casting to increase the baby corn productivity were not obtained.
Keywords: baby corn, casting, cob
JURNAL SAINS DAN MATEMATIKA
2006-10-04 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3385
JURNAL SAINS DAN MATEMATIKA; Volume 14 issue 4 Year 2006
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/7904
2015-09-19T16:58:48Z
sm:Art
"141219 2014 eng "
0854-0675
dc
Konversi Termal Campuran Polietilena-Tempurung Kelapa Menjadi Hidrokarbon Cair
Windari, Tri
Jurusan Kimia FMIPA, Universitas Diponegoro, Semarang
Suseno, Ahmad
Jurusan Kimia FMIPA, Universitas Diponegoro, Semarang
Telah dilakukan penelitian tentang konversi termal campuran polietilena-tempurung kelapa menjadi hidrokarbon cair melalui proses pirolisis dan pirolisis katalitik menggunakan katalis zeolit alam. Katalis zeolit alam dibuat melalui 3 tahap yaitu: aktivasi, kalsinasi dan proses hidrotermal. Enam puluh gram campuran polietilena-tempurung kelapa dengan perbandingan 5:1, 4:2, 3:3, 2:4, 1:5 dipirolisis pada temperatur 300°C. Uap organik yang dihasilkan kemudian didinginkan sehingga diperoleh produk cair. Untuk proses pirolisis katalitik, prosedurnya sama, hanya dilakukan penambahan katalis pada reaktor. Produk cair kemudian dianalisis dengan GC dan GC-MS. Dari keseluruhan proses menunjukkan bahwa volume produk cair pirolisis dan pirolisis katalitik campuran polietilena-tempurung kelapa makin meningkat dengan meningkatnya jumlah polietilena di dalam campuran. Data GC dan GC-MS menunjukkan bahwa proses pirolisis menghasilkan produk utama berupa senyawa hidrokarbon rantai karbon C4 – C11 dan proses pirolisis katalitik menghasilkan senyawa hidrokarbon rantai karbon C8 – C12.
Keywords: pirolisis, pirolisis katalitik, hidrokarbon cair
JURNAL SAINS DAN MATEMATIKA
2014-03-11 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/7904
JURNAL SAINS DAN MATEMATIKA; Volume 19 Issue 2 Year 2011
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8003
2015-09-21T08:58:51Z
sm:Art
"150108 2015 eng "
0854-0675
dc
Biodegradasi Jerami Padi Menggunakan Kompos Termofilik dan Profil SSCP Konsorsium Mikroba
Niron, Christina Elsa
Jurusan Kimia, Fakultas Sains dan Matematika, Universitas Diponegoro, Semarang, Jawa Tengah
Mulyani, Nies Suci
Jurusan Kimia, Fakultas Sains dan Matematika, Universitas Diponegoro, Semarang, Jawa Tengah
Aminin, Agustina L. N.
Biochemistry Laboratory, Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Jerami merupakan bahan lignoselulosa, terdiri atas lignin yang terikat pada hemiselulosa dan selulosa. Sebagian besar penelitian biodegradasi biomassa secara mikrobiologis, memanfaatkan kerja mikroba tunggal yang umumnya bekerja kurang optimal. Dalam penelitian ini jerami didegradasi menjadi gula pereduksi menggunakan konsorsium mikroba dari kompos termofilik. Fermentasi jerami padi dilakukan pada media semisolid menggunakan starter kompos termofilik, dan proses degradasi dipantau berdasarkan kadar gula pereduksi yang dihasilkan setiap 24 jam. Kelimpahan mikroba diamati melalui fragmen gen 16S dan 18S rRNA dengan teknik SSCP (Single Strand Conformation Polymorphism). Degradasi optimum jerami padi didapatkan pada jam ke-72 dengan kadar gula sebesar 0,474 mg/L. Profil pita-pita SSCP ditunjukkan dengan perbedaan jumlah dan intensitas pita-pita dari kelompok jamur maupun bakteri. Perbedaan pita-pita tersebut menunjukkan adanya perbedaan kelimpahan komunitas mikroba baik pada konsorsium kompos maupu mikroba pendegradasi jerami padi.
Keywords: biodegradasi, kompos termofilik, komunitas mikroba, SSCP
JURNAL SAINS DAN MATEMATIKA
2014-03-25 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8003
JURNAL SAINS DAN MATEMATIKA; Volume 20 Issue 2 Year 2012
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8037
2015-09-30T13:09:39Z
sm:Art
"150109 2015 eng "
0854-0675
dc
Solusi Numerik Persamaan Difusi dengan Menggunakan Metode Beda Hingga
Sulpiani, Ririn
Jurusan Matematika FSM Universitas Diponegoro
Jl. Prof. H. Soedarto, S.H. Tembalang Semarang
Widowati, Widowati
Mathematics Department, Faculty of Sciences and Mathematics, Dipongoro University
The developmental process characteristic of the distribution of pressure, enthalpy and temperature on geothermal reservoir can be represented in mathematical models.The basic equation used in the modeling process is the Darcy law and mass equilibrium equations with the physical parameters of the distribution of pressure. Pressure distribution model obtained is a two-dimensional diffusion equation in the form of two-order partial differential equations. Furthermore, the finite difference centered method used to find the numerical solution of the diffusion equation.
Keywords: Geothermal Reservoir, pressure, Darcy law, finite difference method
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8037
JURNAL SAINS DAN MATEMATIKA; Volume 21 Issue 3 Year 2013
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3016
2015-10-14T09:55:45Z
sm:Art
0854-0675
dc
AKTIVITAS BUBUK KAYU MANIS (CINNAMOMUM CASSIA) SEBAGAI INHIBITOR ALFA-GLUKOSIDASE
Sarjono, Purbowatiningrum Ria
Biochemistry Laboratory, Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Ngadiwiyana, Ngadiwiyana
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Ismiyarta, Ismiyarta
Universitas Diponegoro Semarang
Prasetya, Nor Basyid A.
Universitas Diponegoro Semarang
ABSTRAK---Kayu manis banyak digunakan sebagai obat tradisional., misalnya bagian serbuk kulit kayunya telah digunakan oleh masyarakat di negara tropis termasuk Indonesia sebagai obat antidiabetes. Penelitian secara ilmiah mengenai khasiat tersebut belum banyak dilakukan, sehingga perlu dilakukan penelitian secara ilmiah khasiat antidiabetes melalui uji aktivitasnya terhadap inhibitor enzim alfa-glukosidase. Enzim Alfa-glukosidase (EC 3.2.1.20) merupakan karbohidrase yang mengkatalisis pelepasan glukosa dari ujung nonpereduksi karbohidrat makanan. Pada penderita Diabetes Mellitus (DM), inhibisi terhadap enzim ini menyebabkan penghambatan absorpsi glukosa sehingga menurunkan keadaan hiperglikemia setelah makan. Inhibitor alfa-glukosidase merupakan obat antidiabetes oral yang digunakan untuk mengobati DM tipe 2. Penelitian ini bertujuan untuk mengetahui khasiat serbuk kulit kayu manis sebagai antidiabetes melalui uji inhibitor terhadap enzim alfa-glukosidase. Penelitian dilakukan dalam beberapa tahap, yaitu penyediaan bubuk kayu manis dan uji penghambatan terhadap alfa-glukosidase. Pada uji penghambatan alfa-glukosidase digunakan enzim alfa-glukosidase dan p-nitrofenil α-D-glukopiranosid sebagai substrat. Reaksi dari substrat p-nitrofenil α-D-glukopiranosid dengan alfa glukosidase menghasilkan p-nitrofenol, senyawa ini yang diukur intensitasnya. Semakin tinggi intensitasnya semakin tinggi aktivitas alfa glukosidase. Serbuk kulit kayu mampu menghambat alfa glukosidase dalam berbagai konsentrasi. Hasil uji inhibisi menunjukkan, pada konsentrasi 50 ppm, aktivitas penghambatan bubuk kulit kayu manis sebesar 45,31% dengan nilai IC50 sebesar 55,02 ppm.
Kata kunci: bubuk kulit kayu manis, inhibitor alfa-glukosidase, antidiabetes.
Permalink :
JURNAL SAINS DAN MATEMATIKA
2010-04-02 00:00:00
https://ejournal.undip.ac.id/index.php/sm/article/view/3016
JURNAL SAINS DAN MATEMATIKA; Volume 18 Issue 2 Year 2010
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8043
2015-10-14T09:47:50Z
sm:Art
"150112 2015 eng "
0854-0675
dc
Sintesis 3,4-Metilendioksibenzaldehid dari Safrol pada Minyak Lawang (Cinnamomum cullilawan, Bl) sebagai Senyawa Antibakteri
Sarjono, Purbowatiningrum Ria
Biochemistry Laboratory, Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Ngadiwiyana, Ngadiwiyana
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
AP, Nor Basid
Laboratorium Kimia Universitas Diponegoro Semarang
Telah dilakukan penelitian sintesis 3,4-metilendioksibenzaldehid dari minyak lawang (Cinnanomum cullilawan Bl.). Tujuan penelitian ini untuk mengisolasi safrol dan sintesis 3,4-metilendioksibenzaldehid. Isolasi safrol melalui redistilasi dan ekstraksi menggunakan NaOH. Sedangkan sintesis 3,4-Metilendioksibenzaldehid melalui reaksi isomerisasi safrol dan reaksi oksidasi menggunakan Kalium Permanganat (KMnO4). Hasil yang diperoleh dianalisis menggunakan spektrofotometer FTIR dan GC-MS.
Safrol yang diperoleh berupa cairan minyak kekuningan dengan rendemen 22,22%. Hasil isomerisasi safrol yaitu isosafrol berupa cairan minyak kuning kecoklatan. Spektra FTIR menunjukkan adanya gugus metilendioksi, C=C, dan =CH pada gugus alil. Sedangkan hasil oksidasi isosafrol berupa bubuk putih. Spektra FTIR menunjukkan telah terjadi konversi gugus C=C menjadi gugus aldehid.
Aktivitas antibakteri dari senyawa 3,4 metilendioksibenzaldehid terhadap bakteri gram positif (Staphyllococcus aureus) dan bakteri gram negatif (Escherichia coli), dengan metode difusi cakram kertas menunjukkan hasil yang potensial dengan semakin meningkatnya konsentrasi.
Keywords: safrol, isosafrol, 3,4-metilendioksibenzaldehid, minyak lawang
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8043
JURNAL SAINS DAN MATEMATIKA; Volume 21 Issue 4 Year 2013
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3207
2015-09-19T17:05:51Z
sm:Art
0854-0675
dc
PERUBAHAN STRUKTUR DAN KEPADATAN TRIKOMATA NON GLANDULER SERTA LUAS DAUN KAKAO (Theobroma cacao L.) PADA PERLAKUAN STRES KEKURANGAN AIR
Prihastanti, Erma
Universitas Diponegoro
T, Soekisman
Institut Pertanian Bogor
Soepandi, Didie
Institut Pertanian Bogor
Qayim, Ibnul
Institut Pertanian Bogor
ABSTRACT--Cacao is the one important crop in Indonesia. Water stress is perhaps the major factor limiting crop growth. Plant responses to water stress include morphological of biochemical changes. This reserch was aimed studying strtructure and density of non glanduler trichomes, and leaf area on cacao leaves on drought experiment. The drought studies used throughfall displacment experiment (TDE). The result show that cacao leaves have non glanduler trichomes type stellat. Non Glanduler trichomes were distributed throughtout the vein of leaves with distribution in abaxial parts of the leaves. TDE give non significant effect to trichomes density and Ieaf area. The highest trichomes happened on March 2008 6.9861/cm2. Leaf area on shade Ieaves (273,56 cm2) more higher than sun leaves (235,50 cm2).
Keyword : Trichomes non glanduler, cacao leaves, leaf area
JURNAL SAINS DAN MATEMATIKA
2009-01-01 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3207
JURNAL SAINS DAN MATEMATIKA; Volume 17 Issue 1 Year 2009
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/9135
2015-09-30T15:58:13Z
sm:Art
"150116 2015 eng "
0854-0675
dc
Students Major Determination Decision Support Systems using Profile Matching Method with SMS Gateway Implementation
Sopianti, Lilis
Informatics Department, Faculty of Sciences and Mathematics, Diponegoro University
Bahtiar, Nurdin
Informatics Department, Faculty of Sciences and Mathematics, Diponegoro University
In the implementation of curriculum 2013 at high school level, the majoring for students was started from the level of class 10. The available major options are Math and Natural Sciences (MIA), Social Sciences (IIS), and Linguistics and Cultures (IBB). The process of determining the major was conducted by the counseling teacher through a careful selection based on several criteria including grades, graduation test scores, record of accomplishment, student's selected major, and psychological test results. During the process of determining the major, the school often has to deal with several constraints associated with the standard acceptance rules from each major department. To deal with these constraints and minimize the occurrence of human errors, it needs a Decision Support System to carry out the process. In this study, the system is made to apply the Profile Matching method. Profile Matching method calculated the competence of each individual based on given criteria. The implementation of Profile Matching method is optimized by placing core and secondary factor dynamically on each majoring department in order to obtain an ideal results from the majoring selection process. In order to provide added value to the system, an SMS Gateway feature has been installed to help broadcasting the majoring selection results to the participating students.
JURNAL SAINS DAN MATEMATIKA
2015-09-16 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/9135
JURNAL SAINS DAN MATEMATIKA; Volume 23 Issue 1 Year 2015
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3263
2015-09-19T17:09:52Z
sm:Art
0854-0675
dc
Potensi Agensia Anti Fertilitas Biji Tanaman Jarak (Jatropha curcas) dalam Mempengaruhi Profil Uterus Mencit (Mus musculus) Swiss Webster
Puspitadewi, Sinthia
Undip
ABSTRAK---Rodensia memiliki laju reproduksi yang sangat tinggi dan berpotensi sebagai hewan hama. Laju reproduksi yang tinggi perlu diseimbangkan dengan cara menekan laju reproduksi tersebut melalui pengendalian fertilitas (fertility control). Tanaman Jatropha curcas merupakan tanaman yang mengandung jatrophone yang berpotensi sebagai agensia antifertilitas dan dapat menghambat laju reproduksi rodensia. Penelitian ini bertujuan untuk menganalisis potensi agensia antifertilitas yang terkandung dalam biji jarak terhadap profil uterus pada hewan uji mencit. Penelitian dengan menggunakan hewan uji mencit dewasa seksual yang dibagi menjadi 2 kelompok yang masing-masing dengan 9 ulangan. Kelompok I diberi perlakuan akuades (kontrol) dan kelompok II diberi perlakuan larutan serbuk biji jarak secara peroral dengan dosis 0,2 g/ekor/hari dengan lama perlakuan 14 hari. Pembuatan preparat uterus dengan metode paraffin dan pewarnaan HE (Hematoxilin Eosin). Data yang diperoleh diuji dengan menggunakan Paired Sample T Test dengan taraf kepercayaan 95%. Hasil penelitian menunjukkan bahwa agensia antifertilitas pada biji jarak belum memberikan pengaruh yang signifikan terhadap perubahan profil uterus, baik berat uterus maupun tebal endometrium.
Kata Kunci: Agensia antifertilitas,tanaman jarak (Jatropa curcas), mencit, uterus
JURNAL SAINS DAN MATEMATIKA
2012-04-20 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3263
JURNAL SAINS DAN MATEMATIKA; Volume 15 Issue 2 Year 2007
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/10485
2016-05-02T10:44:57Z
sm:Art
"160304 2016 eng "
0854-0675
dc
Zeolite-A Synthesis from Glass
Saraswati, Indah
Chemistry Department, Faculty of Medicine, Diponegoro University
Zeolite can be used as ion exchanger, catalyst, and adsorbent. One type of synthetic zeolites is zeolite-A which being developed to overcome the weakness of natural zeolites for their difference of pore size. This research is aimed to study the synthesized of zeolite-A from wasted glasses as silica source. Hydrogel method was used by reacting sodium aluminate into a sodium silicate solution. The gel formed was heated at 80°C for 8 hours and to produce a white solid. The solid result were characterized by XRD, FTIR, and AAS. The XRD analysis shown that the yield which formed closest to zeolite-A structure was in concentrate variation of sodium silicate and sodium aluminate of 1.05 : 1. This result also can be confirmed by FTIR analysis.
JURNAL SAINS DAN MATEMATIKA
2016-05-02 10:45:02
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/10485
JURNAL SAINS DAN MATEMATIKA; Volume 23 Issue 4 Year 2015
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3380
2015-09-19T17:03:04Z
sm:Art
0854-0675
dc
Learning Vector Quantization Pada Pengenalan Pola Tandatangan
Prabowo, Anindito
Undip
Sarwoko, Eko Adi
Undip
Riyanto, Djalal Er
Undip
ABSTRAK---Pengenalan pola tandatangan dimaksudkan agar komputer dapat mengenali tandatangan dengan cara mengkonversi gambar, baik yang dicetak ataupun ditulis tangan ke dalam kode. Metode yang dipilih dalam pengenalan pola tandatangan ini adalah metode pembelajaran Kohonen Neural Network(Kohonen) dan Learning Vector Quantization(LVQ). Metode Kohonen mengambil bobot awal secara acak, kemudian bobot tersebut di-update hingga dapat mengklasifikasikan diri sejumlah kelas yang diinginkan. Pada metode LVQ bobot awal di-update dengan menggunakan pola yang sudah ada. Dalam penelitian ini, diberikan hasil pengamatan dan perbandingan tentang tingkat keakuratan dan waktu yang dibutuhkan dalam proses pembelajaran terhadap pola tandatangan pada metode Kohonen dan LVQ menggunakan bahasa pemrograman Microsoft Visual Basic 6.0 Enterprise Edition.
Kata kunci: metode Kohonen, neural network, metode Learning Vector Quantization
JURNAL SAINS DAN MATEMATIKA
2006-10-04 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3380
JURNAL SAINS DAN MATEMATIKA; Volume 14 issue 4 Year 2006
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/7900
2016-05-02T10:07:13Z
sm:Art
"141219 2014 eng "
0854-0675
dc
Pembuatan Zeolit Nanopartikel dengan Metode High Energy Milling (Zeolite Nanoparticle Fabrication using High Energy Milling Method)
Muhriz, Mohammad
Laboratorium Kimia Anorganik, Kimia MIPA UNDIP
Subagio, Agus
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Pardoyo, Pardoyo
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Pembuatan nanopartikel menggunakan metode high energy milling belum banyak dilakukan di Indonesia. Tujuan dari penelitian ini adalah membuat zeolit nanopartikel dari zeolit alam dengan metode high energy milling. Zeolit alam Wonosari digerus dan diayak menggunakan ayakan 250 mesh dan kemudian digiling dengan High Energy Milling-Ellipse 3D Motion (HEM-E3D) selama 0, 2, 4, dan 6 jam dengan kecepatan 1000 rpm dan ball to powder ratio (BPR) sebesar 8:1. Bentuk fisis dari zeolit sebelum dan sesudah milling terlihat sama dan sulit dibedakan. Hasil karakterisasi SEM menunjukkan adanya penurunan ukuran partikel dari Z-0 menjadi Z-6. Zeolit dengan waktu milling Z-6 mempunyai ukuran partikel terkecil yaitu sebesar 70-280 nm Karakterisasi dengan metode BET menunjukkan zeolit beraglomerasi yang ditandai dengan tidak adanya perubahan berarti pada luas permukaan spesifik, volume pori total, dan ukuran pori rata-rata semua sampel.
Keywords: high energy milling, zeolit alam, ukuran partikel
JURNAL SAINS DAN MATEMATIKA
2014-03-11 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/7900
JURNAL SAINS DAN MATEMATIKA; Volume 19 Issue 1 Year 2011
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8055
2015-09-19T10:54:39Z
sm:Art
"150112 2015 eng "
0854-0675
dc
Respon Pertumbuhan dan Produksi Senyawa Antioksidan pada Kalus Hibiscus sabdariffa L. dari Eksplan yang Berbeda secara in vitro
Noviati, Agustin
Laboratorium Biologi Struktur dan Fungsi Tumbuhan FSM UNDIP
Nurchayati, Yulita
Laboratorium Biologi Struktur dan Fungsi Tumbuhan FSM UNDIP
Setiari, Nintya
Laboratorium Biologi Struktur dan Fungsi Tumbuhan FSM UNDIP
Ascorbic acid and carotenoid are secondary metabolites found in roselle, which show antioxidant activity. These compounds can be obtained from callus induced by several kinds of explants. The aims of this experiment is to study callus growth from explants which can encourage high level of antioxidant compounds. The callus was obtained from difference organ, i.e. section of leaf, petiole and flower sepal. Sterilized explants were planted in MS (Murashige&Skoog) combined with 2 mg/L Naphtalene Acetic Acid (NAA) dan 5 mg/L Benzyl Adenin (BA). This experiment has been conducted by completly randomized design with 5 replicates. Besides fresh weight callus, callus respons from each explants were analyzed descrptively. Ascorbic acid and carotenoid content were analyzed qualitatively and quantitatively by titration and spectrophotometric respectively. The results showed that all kinds of explant dedifferentiated into callus which antioxidant content. Callus from leaf section had the higgest fresh weight with high level ascorbic acid. Whereas the higgest carotenoid level was obtained from callus-derived flower sepals. It conclused that in vitro callus was useful for producing plant biochemical compounds.
Keywords : Callus induction, antioxidant agents, explants, ascorbic acid, cartenoid
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8055
JURNAL SAINS DAN MATEMATIKA; Volume 22 Issue 1 Year 2014
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8031
2015-09-19T16:50:40Z
sm:Art
"150109 2015 eng "
0854-0675
dc
Prediksi Variabilitas Nilai Tukar Rupiah Indonesia Terhadap Dollar Amerika Serikat Berbasis Sistem Inferensi Fuzzy Jaringan Saraf Adaptif sebagai Analisis Tingkat Perekonomian
Gernowo, Rahmat
Jurusan Fisika FSM UNDIP
Ernitawati, Yenny
Program Doktor Ilmu Ekonomi UNDIP
The purpose of this paper to predict the variability of exchange rate (Rp/ US $) based Adaptif Neuro-Fuzzy Inference Systems (ANFIS) analysis of the economic level. The data is secondary data obtained from the movement of the exchange rate (Rp / US $) in Bank Indonesia from January 2003 to December 2013 . The software is used among others of ANFIS system. The results obtained with the Neuro-Fuzzy system shows the range of estimates for all data were obtained at 89.51% for treatment with ANFIS. Dollar exchange rate variability index, showed a pattern that tends to stabilize after years in which Indonesia was hit by the financial crisis of 1998..
Keywords: Prediction, dollar exchange rate index, ANFIS.
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8031
JURNAL SAINS DAN MATEMATIKA; Volume 21 Issue 2 Year 2013
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8058
2015-09-19T10:53:48Z
sm:Art
"150113 2015 eng "
0854-0675
dc
Metode Optimasi Portofolio Saham Syariah Menggunakan Nonlinear Programming Pada Pasar Modal Syariah di Indonesia
Mussafi, Noor Saif Muhammad
Program Studi Matematika Fakultas Sains dan Teknologi UIN Sunan Kalijaga
Jl. Marsda Adisucipto 1 Yogyakarta 55281
Penelitian ini berusaha untuk mengetahui dan menganalisis pengembangan metode optimasi saham syariah menggunakan kaidah Nonlinier Programming dalam rangka memberikan alternatif portofolio optimal yang dapat dijadikan sebagai referensi dalam meningkatkan kualitas pasar modal syariah di Indonesia. Data dalam penelitian ini adalah informasi harga saham syariah pada Jakarta Islamic Index (JII) periode Januari 2011-Januari 2013 yang dianalisis menggunakan teori-teori matematika keuangan dan dikembangkan menggunakan quadratic programming. Hasil penelitian ini adalah rumusan langkah sistematis dalam memaksimalkan tingkat keuntungan dan meminimalkan tingkat risiko investasi saham syariah serta penentuan proporsi dana yang dapat diinvestasikan pada emiten terbaik yang terpilih.
Kata kunci: saham syariah, quadratic proramming, tingkat risiko dan tingkat keuntungan.
This study sought to determine and analyze the development of Islamic stock optimization method using Nonlinear Programming principles in order to provide alternative optimal portfolio can be used as a reference in improving the quality of Islamic capital market in Indonesia. The data in this study is the Islamic stock price incorporated in the Jakarta Islamic Index (JII) in the period Januari 2011-Januari 2013 are analyzed using mathematical theories in finance and quadratic programming. The results of this study is the formulation of a systematic step in maximizing return and minimizing investment risk of Syariah stocks and determining the proportion of funds that can be invested in the best companies choosen.
Keywords : syariah stock, quadratic programming , risk and return
JURNAL SAINS DAN MATEMATIKA
2014-04-16 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8058
JURNAL SAINS DAN MATEMATIKA; Volume 22 Issue 2 Year 2014
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8009
2015-09-19T16:54:12Z
sm:Art
"150108 2015 eng "
0854-0675
dc
Keragaman Serangga dan Perannya di Ekosistem Sawah (Insect Diversity and its Role in Wetland Ecosystems)
Hadi, Mochamad
Laboratorium Ekologi dan Biosistematik Jurusan Biologi
Fakultas Sains dan Matematika Universitas Diponegoro
Aminah, Aminah
Laboratorium Ekologi dan Biosistematik Jurusan Biologi
Fakultas Sains dan Matematika Universitas Diponegoro
Ekosistem sawah merupakan faktor penting dalam pemenuhan kebutuhan pangan. Keanekaragaman hayati seperti jenis-jenis tanaman, hewan, dan mikroorganisme yang ada dan berinteraksi dalam suatu ekosistem sawah sangat menentukan tingkat produktivitas pertanian. Serangga sebagai salah satu komponen ekosistem sawah memiliki peranan penting dalam jaring makanan yaitu sebagai herbivora, karnivora (predator dan parasitoid), dan detritivora. Di dalam ekosistem sawah terdapat berbagai macam jenis serangga yang hidup dan tinggal di ekosistem sawah tersebut. Penelitian bertujuan untuk mengkaji keanekaragaman serangga dan menganalisis peranan serangga yang ditemukan dalam ekosistem sawah. Penelitian dilakukan di lahan sawah di Kelurahan Pedalangan Kecamatan Tembalang Kota Semarang. Metoda penelitian menggunakan metoda perangkap sumuran (pit fall traps), perangkap lampu (light traps) dan perangkap nampan kuning (yellow tray traps). Hasil yang diperoleh nampak bahwa serangga yang didapatkan dibagi menjadi 4 kelompok berdasarkan peranannya yaitu serangga herbivor, serangga predator, serangga parasitoid dan serangga detritivor. Dari semua jenis serangga yang teridentifikasi maka 49.6% diantaranya adalah serangga herbivor, 46.1% merupakan serangga predator, 3.5% merupakan serangga parasitoid dan 0.6% adalah serangga detritivor. Keanekaragaman serangga yang ditemukan di lahan sawah adalah dengan perangkap sumuran diperoleh 23 spesies dalam 14 famili dalam 8 ordo, dengan perangkap lampu diperoleh 9 spesies dalam 7 famili dari 4 ordo, dengan perangkap nampan kuning diperoleh 8 spesies dalam 6 famili dan 3 ordo.
Kata kunci : keanekaragaman serangga, peranan serangga, ekosistem sawah.
Rice ecosystems is an important factor in meeting food needs . Biodiversity such as the types of plants , animals , and microorganisms that exist and interact in a rice field ecosystem will determine the level of agricultural productivity . Insects as one component of rice ecosystems have an important role in the food web that is as herbivores , carnivores ( predators and parasitoids ) , and detritivora . In the rice field ecosystem there are many types of insects that live and work in the rice field ecosystem . The study aims to assess the diversity of insects and analyze the role of insects found in the rice ecosystem . The study was conducted in paddy fields in the village of Semarang District Tembalang puppetry . Research method using trap method pitting ( pit fall traps), light traps ( light traps ) and traps yellow tray ( tray yellow traps) . The results obtained it appears that the insects were divided into 4 groups based on the role that herbivor insects, insect predators , parasitoids and insect insect detritivor . Of all the types of insects identified 49.6 % of them are herbivor insect, an insect predator 46.1 % , 3.5 % is 0.6 % and the parasitoid insects are insects detritivor . Diversity of insects found in the fields is to trap the wells acquired 23 species in 14 families in 8 orders, with light traps obtained 9 species in 7 families of 4 orders, with yellow tray traps obtained 8 species in 6 families and 3 orders .
Keywords : insect diversity, the role of insects, rice ecosystems.
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8009
JURNAL SAINS DAN MATEMATIKA; Volume 20 Issue 3 Year 2012
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3141
2015-09-19T17:06:21Z
sm:Art
0854-0675
dc
MEMBANGUN KODE GOLAY (24, 12, 8) DENGAN MATRTKS GENERATOR DAN MENGGUNAKAN KRITERIA PERMUTASI
Irawanto, Bambang
Universitas Diponegoro
Rizki K., Ikhsan
Universitas Diponegoro
ABSTRACT- -One of the more useful block codes k the binary Q4, .12, 8) etended Golay code.
The binary (24, 12, 8) actended Golay code can be constructed through the direct sum operationwith irwolve
two product codes. This methodform the generator matrixframework of the (24, 12, 8) Golay code that is
basedontheso-calledTuytnorla+xlb +xla+ b+xlcanstntction,wherea,bE Crandxe C', C,andC',
is the (8, 4, 4) Iinear block codes. C, can be gotten through row permutation of the parity submaffix of CL
With q and C', and by applying the generator matrixframework of the (24. 12, S) Golry code get the binary
(24, 12, 8) utended Golay code..
Keyword :Block codes, direct sum, Goloy Code, product codes.
JURNAL SAINS DAN MATEMATIKA
2010-10-22 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3141
JURNAL SAINS DAN MATEMATIKA; Volume 17 Issue 2 Year 2009
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/9005
2015-10-14T09:57:06Z
sm:Art
"141015 2014 eng "
0854-0675
dc
Natural Polarization and Electrooptics Comparison for Evaluation of Cooking Oil Total Quality
Sugito, Heri
Diponegoro University
Firdausi, Ketut Sofjan
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
In this study, the phenomena of natural polarization and electrooptics effect have been compared as alternative methods for evaluation of vegetable oil quality. The sample used in the experiment was various vegetable oils. The change of light polarization was measured using a pair of polarizer for natural polarization and in case of electrooptics with addition of induced external electric field through DC high voltage. The result has shown that both methods are able to indicate the level of various oil quality. The natural polarization is very useful for preliminary test of oil quality. In the other hand, the electrooptics has a good prospect as single physical indicator for vegetable oil quality.
JURNAL SAINS DAN MATEMATIKA
2015-08-30 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/9005
JURNAL SAINS DAN MATEMATIKA; Volume 22 Issue 4 Year 2014
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3258
2015-09-19T17:09:33Z
sm:Art
0854-0675
dc
Model Dinamik Pertumbuhan Ekonomi Indonesia Pasca Krisis Moneter: Suatu Pendekatan Koreksi Kesalahan (Model Koreksi Kesalahan)
I Marudani, Di Asih
UNDIP
Wilandari, Yuciana
UNDIP
Safitri, Diah
UNDIP
ABSTRACT---Salah satu perkembangan utama pada spesifikasi dinamis adalah Error Correction Model (ECM). ECM dapat dipakai untuk menjelaskan mengapa pelaku ekonomi menghadapi ketidakseimbangan (disequilibrium). Secara khusus, Teorema Representasi Gramger menyatakan bahwa ECM dapat dikatakan valid jika memuat himpunan variabel yang memenuhi uji kointegrasi. Pada hubungan keseimbangan antara xt dan yt adalah : yt = β0 + β1 xt maka dari penurunan rumus diperoleh Error Correction Model : ∆ yt= b1 ∆ xt – λ (yt-1 - β0 - β1 xt-1) + et 0 < λ < 1 Pada penelitian ini, akan diselidiki faktor-faktor yang mempengaruhi pertumbuhan ekonomi Indonesia pasca krisis moneter, yaitu periode 1997(III) – 2004(IV), sebagai studi kasus. Hasil empiris digunakan untuk menyelidiki efek jangka pendek dan jangka panjang dari variabel-variabel penjelas pada model pertumbuhan ekonomi. Dari hasil analisis diperoleh ECM : ∆ln(ĝdp)t = 0.004633 – 0.954748∆ln(kre)t + 0.397869∆ln(eks)t + 0.046700 ∆ln(fdi)t + 0.286713∆ln(kre)t-1– 0.183157∆ln(eks)t-1 – 0.360344∆ln(fdi) t-1 + 0.34592ECT Dan model jangka panjang yang dihasilkan adalah : ln (ĝdp)t= 0.013418 + 1.828841 ln(kre) + 0.470522 ln(eks) – 0.041697 ln (fdi) Kata kunci : Model Koreksi Kesalahan, kointegrasi, stasioneritas
JURNAL SAINS DAN MATEMATIKA
2007-01-01 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3258
JURNAL SAINS DAN MATEMATIKA; Volume 15 Issue 1 Year 2007
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/9275
2015-10-14T09:38:08Z
sm:Art
"150715 2015 eng "
0854-0675
dc
Effect of Series Circuit on the Lactose Bioelectricity of a Microbial Fuel Cell System using Lactobacillus bulgaricus
Hayati, Dini Noor
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Nuryanto, Rahmad
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Suyati, Linda
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
The need for alternative energy, especially electricity at this time is increasing. The decreasing amount of fuel that cannot be updated, encouraging scientists to conduct researches in finding alternative energy sources which are environmentally friendly, one of the alternative energy is the Microbial Fuel Cell (MFC). The research on the effects of a series circuit on the production of lactose bioelectricity microbial fuel cell system using Lactobacillus bulgaricus has been conducted. This study aim was to assess the effect on the production series circuit lactose bioelectricity MFC system using microbes Lactobacillus bulgaricus. Stages of research included a microorganism preparation of Lactobacillus bulgaricus, and measuring the potential difference in a single, series 1 and series 2 circuits in the MFC system. The potential difference on the measurement of a single, series 1 and series 2 on the substrate lactose were 45 mV / 100mL; 57 mV / 100mL; 58 mV / 100mL respectively where the power were 105.75x10-6 mW; 136x10-6 mW; 139.2x10-6 mW. These results suggested that series circuit was able to increase the potential difference and power on the substrate lactose and tofu whey the MFC system according to Ohm’s law.
Keywords: Lactose, microbial fuel cell, Lactobacillus bulgaricus, a series circuit
JURNAL SAINS DAN MATEMATIKA
2015-10-14 09:33:37
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/9275
JURNAL SAINS DAN MATEMATIKA; Volume 23 Issue 3 Year 2015
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3279
2015-09-19T17:11:07Z
sm:Art
0854-0675
dc
PENGARUH FORMALIN, DIAZEPAM DAN MINUMAN BERALKOHOL TERHADAP KONSUMSI PAKAN, MINUM DAN BOBOT TUBUH Mus musculus
Saraswati, Tyas Rini
Undip
Indraswari, Endah
Undip
Nurani, Nurani
Undip
ABSTRACT---Diazepam, formalin and drink which contain alcohol are substances that can be a toxic if they are accumulated in a body. Drink that contains alcohol can make someone drunk. Diazepam is a medicine that calms and its function is to decrease neuron activity. While formalin which is to used as food preservation causes metabolism disorder. This aim of this research was to investigate and analyze the physiological aspect of M musculus body after it was treated with diazepam, formalin and drink alcoholic. The research used completely Randomize Design. The animal that was in experiment were 16 male M musculus and divided into 4 treatments and 4 replications. The treatments were P0 (Control), P1 (0.04 mg Diazepam), P2 (100 ppm Formalin), P3 (Drink which contains 4,8% alcohol ). Food and drinking water were ad libitum. The treatments were given daily for 30 days. The data were analyzed with anova. The result indicated that were not significant for all parameters. So, it was concluded that 0.04 mg diazepam, 100 ppm formalin and drink which contains 4,8% alcohol didn’t change the metabolism of M musculus body.
Key words: diazepam, formalin and drink alcoholic
JURNAL SAINS DAN MATEMATIKA
2012-04-23 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3279
JURNAL SAINS DAN MATEMATIKA; Volume 17 Issue 3 Year 2009
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/6254
2016-05-02T10:06:10Z
sm:Art
"140226 2014 eng "
0854-0675
dc
PENGARUH AKTIVASI ZEOLIT DENGAN KMnO4 , K2S2O8 DAN H2SO4 TERHADAP ADSORPSIFITAS ION Na+ DAN Mg2+ DIUJIKAN PADA AIR TANAH KARIMUNJAWA BLOK I
Ekawati, Rini
Laboratorium Kimia Anorganik, Kimia MIPA UNDIP
Taslimah, Taslimah
Laboratorium Kimia Anorganik, Kimia MIPA UNDIP
Pardoyo, Pardoyo
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
ABSTRAK---Telah dilakukan penelitian untuk mengaktivasi zeolit alam menggunakan H2SO4, KMnO4 dan K2S2O8 untuk mengadsorpsi ion Na+ dan Mg2+ dalam air tanah Karimunjawa Blok I. Perlakuan meliputi proses refluks dalam campuran H2SO4-KMnO4 atau H2SO4-K2S2O8 pada suhu 80 ºC selama 5 jam, dilanjutkan pencucian sampai pH mendekati netral dan pengeringan pada suhu 80 ºC selama 12 jam. Hasil penelitian menunjukkan aktivasi dengan H2SO4-KMnO4 meningkatkan rasio Si/Al dari 5,46 menjadi 7,84, luas permukaan, volume dan ukuran pori. Sedangkan dengan H2SO4-K2S2O8 meningkatkan rasio Si/Al menjadi 6,38, luas permukaan dan volume pori sebaliknya ukuran pori mengalami penurunan. Zeolit aktivasi dengan H2SO4-KMnO4 mempunyai daya adsorpsi terhadap ion Na+ dan Mg2+ paling besar dibanding dengan zeolit aktivasi dengan H2SO4-K2S2O8 dan zeolit alam. Persentase penurunan ion Na+ berturut-turut 80,38%, 54,24% dan 31,28% dari kadar Na+ mula-mula 784,74 ppm sedangkan ion Mg2+ berturut turut 22,47%, 17,05% dan 15,93% dari kadar Mg2+ mula-mula 477,19 ppm.
Kata kunci: aktivasi zeolit, ion Na+ dan Mg+, karimunjawa
SUMMARY---It has been done a research to activate natural zeolite with H2SO4, KMnO4 and K2S2O8 to adsorp Na+ and Mg2+ ions in groundwater of Karimunjawa Block I. The treatments of natural zeolite included refluk process in mixture of H2SO4-KMnO4 or H2SO4-K2S2O8 at 80 ºC for 5 hours, and then continued cleaning until neutral pH and dried at 80 ºC for 12 hours. The result showed that activation using H2SO4-KMnO4 increased Si/Al ratio from 5.46 to 7.84, surface area, total pore volume, and average of pore radius. While using H2SO4-K2S2O8 increased Si/Al ratio to 6.38, surface area, and total pore volume otherwise the average of poreradius decreased. Adsorption Na+ and Mg2+ ions of activated zeolite by H2SO4-KMnO4 was highest compared tothe activated zeolite by H2SO4-K2S2O8 and natural zeolite. The decreasing of precentage of Na+ ions were 80.38%, 54.24% and 31.28% from the first concentration 784.74 ppm since Mg2+ ions were 22.47%, 17.05% and 15.93% from the first concentration 477.19 ppm.
Keywords: zeolite activation, Na+ and Mg2+ ions, karimunjawa
JURNAL SAINS DAN MATEMATIKA
2014-02-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/6254
JURNAL SAINS DAN MATEMATIKA; Volume 18 Issue 4 Year 2010
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8001
2015-10-14T11:35:55Z
sm:Art
"150108 2015 eng "
0854-0675
dc
Diatom Epipelik sebagai Bioindikator Kualitas Perairan Danau Rawa Pening
Soeprobowati, Tri Retnaningsih
Biology Department, Faculty of Sciences and Mathematics, Diponegoro University
Hidayat, Jafron Wasiq
Jurusan Biologi FMIPA Universitas Diponegoro Semarang
Baskoro, Karyadi
Biology Department, Faculty of Sciences and Mathematics, Diponegoro University
Diatom is a unicellular micro algae that had an important role in the food web and major contributor of oxygen in the water. The short life cycle, rapid reproduction, cosmopolite, wide spread distribution, variation in population, most are sensitive to the environmental changes, easily handle samples and identification, low cost of sampling and data analysis may promote diatoms as a powerful bioindicator of water quality. The unique siliceous frustules make diatoms able to preserve in the sediment.
Rawa Pening is a semi natural lake that administratively surrounded by four districts that consist of 27 villages. The main problem of this lake is erosion in the upstream and sedimentation in the downstream area as well as uncontrolled of aquatic plant growth, particularly water hyacinth (Eichornia crassipes) that induce lake shallowness. For people who live around Rawa Pening, this lake had been used for agricultural irrigation, fisheries, electricity power and tourism. To conserve the lake, as 3rd World Water Forum in Tokyo, March 2003 and 2006 – 2009 National Research Agenda there is a need of limnological research on the environmental changes. This research was conducted in order to study the potential used of epipelic diatom as bioindicator of lenthic ecosystem, particularly Rawa Pening Lake. Water and sediment samples were taken from 27 sites from inlet, outlet and water body of Rawa Pining Lake.
There were 254 diatom species that consist of 8 Centrophycidae species and 246 Pennatophycidae species. The population varied between 6,989 and 3,781,000 individual/gram. Based on diversity indices of diatom, some part of Rawapening Lake was unstable, whereas the others were stable based on the diversity indices. Based on epipelic diatom, Rawa Pening Lake and its catchments area might be divided into 3 groups: agricultural lotic ecosystem, settlement lotic ecosystem and lenthic ecosystem. The high population of Synedra ulna, Nitzschia palea and Aulacoseira indicated that the lake is eutrophic that tent to be hypereutrophic. It was supported by high concentration of total nitrogen and phosphorous. The concentration of heavy metals Cadmium, Chromium, Copper and Lead were very high in sediment. However, the government of Indonesia has not yet set up sediment quality criteria. The following research would be proposed on this matter.
Key words: diatom, bioindicator, water quality, Rawapening
JURNAL SAINS DAN MATEMATIKA
2014-03-24 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8001
JURNAL SAINS DAN MATEMATIKA; Volume 19 Issue 4 Year 2011
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8020
2018-08-21T07:16:43Z
sm:Art
"150109 2015 eng "
0854-0675
dc
The Characteristics of Coconut Phospholipids as Biosurfactants
Hudiyanti, D.
Department of Chemistry, Diponegoro University
Jl. Prof. Sudharto, SH Semarang, Indonesia 50275
Supardi, A.
Department of Chemistry, Diponegoro University
Jl. Prof. Sudharto, SH Semarang, Indonesia 50275
Nugroho, S.
Department of Chemistry, Diponegoro University
Jl. Prof. Sudharto, SH Semarang, Indonesia 50275
All living cells consist of phospholipids. Phospholipids are known as biosurfactants. Here we report our study of the physico-chemical characteristics of phospholipids derived from coconut endosperm as biosurfactants. We studied the aggregation and emulsification characters. The aggregation proccess was examined by optical microscope. The stability of emulsi formed was montitored at different temperature and pH. Where as emulsification capability was investigated by constructing a ternary diagram. Depending on the amount of phospholipids and additive substances the emulsification capability changes. The coconut phospholipids will form vesicles in various size (polydisperse). We noticed that coconut phospholipids emulsification stability was affected by temperature, pH, and phospholipids composition. It can be concluded that the prospect of phospholipids from coconut endosperm as biosurfactants is promising.
Keywords: coconut phospholipid, emulsification capability, aggregation, ternary diagram, vesicle.
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8020
JURNAL SAINS DAN MATEMATIKA; Volume 20 Issue 4 Year 2012
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8036
2016-05-02T09:55:14Z
sm:Art
"150109 2015 eng "
0854-0675
dc
Pembuatan dan Karakterisasi Komposit CNT/PVA
Setyaningsih, Metri
Laboratorium Fisika Material, Jurusan Fisika
Fakultas Sains dan Matematika, Universitas Diponegoro
Widiyandari, Hendri
Laboratorium Fisika Material, Jurusan Fisika
Fakultas Sains dan Matematika, Universitas Diponegoro
Subagio, Agus
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Komposit CNT/PVA telah dibuat dengan metode solution processing. Polyvinyl alcohol (PVA) dilarutkan dalam akuades bertemperatur 80°C, dan kemudian carbon nanotubes (CNT) ditambahkan ke dalam larutan tersebut dengan berbagai variasi rasio fraksi massa CNT/PVA sebesar 10, 20 dan 30%. Komposit CNT/PVA terbentuk setelah dikeringkan dalam oven bertemperatur 90°C. Sifat mekanik komposit CNT/PVA dikarakterisasi dengan uji tarik. Komposit CNT/PVA yang memberikan sifat mekanik terbaik selanjutnya digunakan sebagai acuan dalam pembuatan komposit dengan variasi ketebalan. Komposit dengan variasi ketebalan dibuat dengan 3 metode yaitu cetak tebal, cetak lapis tebal dan cetak lapis tipis. Analisis dari uji tarik menunjukkan bahwa komposit CNT/PVA dengan fraksi massa 20% CNT/PVA menghasilkan modulus Young yang paling besar yaitu 137,710348 MPa. Metode cetak lapis tipis menunjukkan peningkatan yang lebih besar dibandingkan dengan metode cetak tebal, dan cetak lapis tebal. Komposit dengan 3 lapis dan ketebalan 0,94 mm menghasilkan modulus Young sebesar 212,825166 MPa dan peningkatan modulus Young komposit CNT/PVA terhadap modulus Young dari PVA sampai 107,30%.
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8036
JURNAL SAINS DAN MATEMATIKA; Volume 21 Issue 3 Year 2013
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/7989
2015-09-21T08:59:44Z
sm:Art
"150107 2015 eng "
0854-0675
dc
16S rRNA Gene Analysis of Chlorate Reducing Thermophilic Bacteria from Local Hot Spring
Aminin, Agustina L. N.
Biochemistry Laboratory, Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Katulistiwasari, Puri
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University, Semarang
Mulyani, Nies Suci
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University, Semarang
Chlorates waste remediation by biological processes has been the object of current research. Strain CR, the chlorate reducing bacteria was isolated from Gedongsongo hot spring using minimal medium broth containing chlorates and acetate at 55oC. The determination of chlorate reduction from medium was carried out using turbidimetric method. CR isolate showed reducing ability 18% after four days of incubation. The phenotypic character of CR isolate including rod-shaped cells, gram-positive bacteria and facultative anaerobes. On the basis of 16S rRNA analysis, CR isolate was closely related to Bacillus pallidus, Aeribacillus E3, Geobacillus pallidus and Geobacillus sp.D64. The similarity of nucleotide sequences of 16S rRNA gene was 97%, suggested as a novel species.
Keyword: thermophilic bacteria, chlorate reducing, 16S rRNA gene
JURNAL SAINS DAN MATEMATIKA
2014-03-24 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/7989
JURNAL SAINS DAN MATEMATIKA; Volume 19 Issue 4 Year 2011
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3118
2015-09-19T17:06:54Z
sm:Art
0854-0675
dc
MODEL PERTUMBUHAN LOGISTIK PREDATOR DAN PREY PADA POPULASI PREY DAN SOLUSI KESETIMBANGAN
Sunarsih, Sunarsih
Universitas Diponegoro
Hidayati, Firsty Nur
Universitas Diponegoro
ABTRACT-- A predator-prey model with logistic growth in the prey population is an iknteraction between a predator and a prey population with logistic growth in the prey population. The equations in this model are non linear dffirentiat equation with two dependent variables. In this system, H(t) X size of prey population at time t and P(t) is size of predator population at time t . This model have three equilibria.
Key words : logistic, predator and prey, equilibrium point
Permalink : http://ejournal.undip.ac.id/index.php/sm/article/view/3118
JURNAL SAINS DAN MATEMATIKA
2010-01-01 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3118
JURNAL SAINS DAN MATEMATIKA; Volume 18 Issue 1 Year 2010
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/9000
2015-09-21T21:00:22Z
sm:Art
"140715 2014 eng "
0854-0675
dc
Anthocyanin Identification of Methanol-HCl Extract Active Fraction in Rosella (Hibiscus Sabdariffa. L) and Its Potential as Xanthine Oxidase Inhibitor
Lestari, Pratiwi Puji
Diponegoro University
Kusrini, Dewi
Diponegoro University
Anam, Khairul
Organic Chemistry Laboratory, Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
The active fraction of methanol-HCl extract of Roselle flower (Hibiscus sabdariffa. L) has been identified and its inhibitor xanthine oxidase potential tested. The aim of this study was to compare the inhibitory activity of xanthine oxidase from methanol-HCl extract and its fractionation results and to identify the chemical component of Roselle flower’s methanol-water active fraction which had xanthine oxidase inhibition activity. The chemical component identification of Roselle flower was preceded by extraction and fractionation. The types of chemical compound contents were identified by the spotting appearance, UV-Vis and IR spectroscopy. The quantification of chemical compound was carried out by TLC Scanner and xanthine oxidase inhibitory activity was tested in vitro. From this research, it was obtained the methanol-HCl extract yield of 4%. The Roselle methanol-HCl extract has the ability to inhibit activity of xanthine oxidase (IC50) was 0.64 ppm which was preponderant than the fractionation result. The 2nd fraction was the most active to inhibit the xanthine oxidase activity compared to the 1st and 3rd fraction. The main components of 2nd fraction were isolates A (Rf 0.9) and isolates D (Rf=0.64) which were expected as the group of anthocyanin. The relative level of isolate A and D were 4.67% and 24.24% respectively.
JURNAL SAINS DAN MATEMATIKA
2014-07-15 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/9000
JURNAL SAINS DAN MATEMATIKA; Volume 22 Issue 3 Year 2014
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3231
2015-09-21T08:50:21Z
sm:Art
0854-0675
dc
PROFIL TAMPILAN FISIK DAN KANDUNGAN KURKUMINOID DARI SIMPLISIA TEMULAWAK (CURCUMA XANTHORRHIZA ROXB) PADA BEBERAPA METODE PENGERINGAN
Zahro, Laely
Universitas Diponegoro
Cahyono, Bambang
Organic Chemistry Laboratory, Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University, Semarang Jalan Prof. Soedarto, Tembalang, Semarang 50275, Telepon +62-24-7474754
Hastuti, Rini Budi
Universitas Diponegoro
ABSTRAK-Penelitian dilakukan untuk mempelajari pengaruh beberapa metode terhadap kualitas simplisia temulawak yakni dengan melihat tampilan fisik dan kandungan kurkuminoid temulawak. Rimpang temulawak segar dibersihkan, dipotong, dikeringkan dengan beberapa metode pengeringan yaitu pengeringan oven dengan suhu 60oC, pengeringan dengan oven lampu suhu 30oC, pengeringan dengan sinar matahari dari jam 08.00-11.00 dan dari jam 08.00-15.00, dihaluskan, diekstraksi, dan dianalisis menggunakan spektrofotometer UV- visible. Simplisia hasil pengeringan oven dan oven lampu mempunyai wama yang cerah dan permukaannya berwarna jingga kekuningan sedangkan simplisia hasil pengeringan matahari berwarna gelap dan terinfeksi jamur putih. Hasil kandungan kurkuminoid ditampilkan dalam persen dari berat kering dan diuji dengan Analisis Varian Eka Arah Kruskal Wallis pada taraf signifikansi 5%. Kadar kurkuminoid yang dihasilkan dari pengeringan oven yaitu 0,68%, 0,92%, 0,91%, dan 0,82%, dari pengeringan oven lampu yaitu 0,71%, 0,83%, 0,57%, dan 0,97%, dari pengeringan matahari pada jam 08.00-11.00 yaitu 0,82%, 0,99%, 0,64%, dan 0,89% dan dari pengeringan matahari pada jam 08.00-15.00 yaitu 0,80%, 0,89%, 0,84%, dan 0,93%. Kadar kurkuminoid yang diteliti dari beberapa metode pengeringan tersebut menunjukkan tidak ada perbedaan yang sighnifikan.
Kata kunci : kurkuminoid, pengeringan, simplisia, uv-visibel
JURNAL SAINS DAN MATEMATIKA
2009-01-01 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3231
JURNAL SAINS DAN MATEMATIKA; Volume 17 Issue 1 Year 2009
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/9172
2015-09-19T16:46:49Z
sm:Art
"150415 2015 eng "
0854-0675
dc
Isolation and Identification of Mold Contaminants on Mushroom Growing Medium (Bag Log) and Their Cellulolytic Performance Test
Handayani, Tatik
Biology Department, Faculty of Sciences and Mathematics, Diponegoro University
Purwantisari, Susiana
Biology Department, Faculty of Sciences and Mathematics, Diponegoro University
Mushrooms naturally grows on logs that have experienced weathering. Raw materials of mushroom growth media containing plenty of wild microbes, especially wild mold on sawdust media. Sterilization conducted did not prevent the occurrence of contamination. This study aim was to determine the types of contaminant molds in cultivated mushroom growth media (bag logs), as well as determine their cellulolytic performance. Mushroom growth media (bag log) samples were taken from three mushroom cultivation locations. Mold isolates obtained were identified by their macroscopic and microscopic characteristics. Test the mold cellulolytic performance was conducted by measuring the ratio of hydrolysis zone with the diameter of mold on CMC (Carboxy Methyl Cellullose) media. The isolation and identification results of contaminant molds consisted of mold isolates which could be grouped into 7 genus which were Aspergillus, Penicillium, Paecillomyces, Trichoderma, Rhizopus, Fusarium and Syncephalastrum. The cellulolytic performances of mold on CMC media showed that Aspergillus flavus has the greatest cellulolytic ability.
JURNAL SAINS DAN MATEMATIKA
2015-09-19 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/9172
JURNAL SAINS DAN MATEMATIKA; Volume 23 Issue 2 Year 2015
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3269
2015-09-30T13:03:10Z
sm:Art
0854-0675
dc
Aktivitas Antibakteri Rimpang Temu Putih (Curcuma mangga Vall)
Sarjono, Purbowatiningrum Ria
Biochemistry Laboratory, Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
ABSTRAK---Penelitian ini dilakukan untuk menguji hipotesis bahwa rimpang temu putih mempunyai aktivitas sebagai antibakteri dan menentukan KHTM (Konsentrasi Hambat Tumbuh Minimum). Rimpang temu putih diambil filtratnya kemudian dibagi tiga. Pertama langsung diuji aktivitasnya, kedua diotoklaf kemudian diuji aktivitasnya dan ketiga dikeringkan (bubuk). Ketiga filtrat tersebut diuji terhadap pertumbuhan bakteri E.coli dengan metode kertas cakram. Aktivitas antibakteri filtrat rimpang temu putih tanpa otoklaf lebih tinggi dibanding yang diotoklaf. KHTM bakteri E.coli adalah 10 mg/mL dengan konsentrasi yang menghasilkan hambatan maksimum pada 50 mg/mL sebesar 6,83 mm. Filtrat rimpang temu putih dapat dipakai sebagai antibiotik terhadap penyakit yang disebabkan oleh E.coli.
Kata kunci: antibakteri, temu putih, Konsentrasi Hambat Tumbuh Minimum (KHTM)
JURNAL SAINS DAN MATEMATIKA
2012-04-20 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3269
JURNAL SAINS DAN MATEMATIKA; Volume 15 Issue 2 Year 2007
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3386
2015-09-19T17:02:08Z
sm:Art
0854-0675
dc
Agregasi Embrio Tahap Pembelahan 8 Sel pada Medium Kultur KSOMaa untuk Menghasilkan Embrio Hasil Agregasi dengan Nilai Viabilitas yang Tinggi: Kajian pada Hewan Model Mencit (Mus musculus)
Sunarno, Sunarno
Undip
ABSTRAK---Agregasi atau penggabungan embrio untuk menghasilkan embrio dengan kualitas unggul dapat dilakukan pada tahap awal perkembangan embrio sampai sebelum embrio mencapai tahap morula kompak. Agregasi embrio dapat dilakukan dengan beberapa cara, yaitu: agregasi antar embrio tanpa zona peluzida menjelang proses kompaksi dan agregasi embrio tahap aawal yang masih mempunyai blastomer dengan konfogurasi longgar satu sama lain. Penelitian ini bertujuan untuk mengetahui nilai viabilitas embrio hasil agregasi pada medium KSOMaa melalui proses agregasi embrio tahap pembelahan 8 sel. Hasil penelitian menunjukkan bahwa medium KSOMaa mampu menstimulasi pertumbuhan dan perkembangan embrio tahap pembelahan 8 sel sehingga dihasilkan embrio hasil agregasi dengan nilai viabilitas yang tinggi. Untuk mendukung proses agregasi sehingga dihasilkan embrio dengan nilai viabilitas yang tinggi dalam sistem kultur in vitro, harus memperhatikan beberapa faktor, antara lain sumber gas CO2, nutrisi (medium), substrat (wadah) dan suhu inkubasi. Dalam mempersiapkan medium juga harus diperhatikan beberapa hal penting, seperti sumber air yang digunakan sebagai pelarut, sifat fisik seperti osmolaritas, pH serta komposisi media yang disesuaikan dengan kebutuhan pertumbuhan dan perkembangan embrio.
Keywords: kultur in vitro, agregasi, embrio, viabilitas, mencit (Mus musculus)
JURNAL SAINS DAN MATEMATIKA
2006-10-04 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3386
JURNAL SAINS DAN MATEMATIKA; Volume 14 issue 4 Year 2006
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/7913
2015-09-19T16:57:11Z
sm:Art
"141223 2014 eng "
0854-0675
dc
Pemodelan Regresi Logistik dalam Penentuan Faktor-Faktor yang Berpengaruh Terhadap Penyakit Jantung Koroner
Hoyyi, Abdul
Jurusan Statistika Fakultas MIPA Universitas Diponegoro Semarang
Coronary heart disease (CHD) is a health problem and is one of the leading causes of the death in both developed and developing countries. Thereby it needs to analyze the factors which influence it. Some factors supposedly influence the CHD’s patients are cholesterol levels, low density lipoprotein levels, high density lipoprotein levels, triglyceride levels, systolic blood pressure, diastolic blood pressure and gender. The data used are secondary data from the medical records of CHD’s patients and general check-up records of the healthy people in a hospital in Yogyakarta. The analysis used in this research is binary logistic regression response with dichotomous dependent variables. Of the seven suspected factors, only four significant influence factors namely cholesterol levels, high-density lipoprotein levels, systolic blood pressure and diastolic blood pressure.
Keywords: CHD, logistic regression
JURNAL SAINS DAN MATEMATIKA
2014-03-14 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/7913
JURNAL SAINS DAN MATEMATIKA; Volume 19 Issue 3 Year 2011
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8005
2015-09-19T16:55:36Z
sm:Art
"150108 2015 eng "
0854-0675
dc
Pengaruh Zat Pengatur Tumbuh (ZPT) Root-Up dan Super-GA Terhadap Pertumbuhan Akar Stek Tanaman Jabon (Anthocephalus cadamba Miq)
Jinus, Jinus
Laboratorium Biologi dan Fungsi Tumbuhan, Jurusan Biologi
Fakultas Sains dan Matematika, Universitas Diponegoro, Tembalang, Semarang
Prihastanti, Erma
Laboratorium Biologi dan Fungsi Tumbuhan, Jurusan Biologi
Fakultas Sains dan Matematika, Universitas Diponegoro, Tembalang, Semarang
Haryanti, Sri
Laboratorium Biologi dan Fungsi Tumbuhan, Jurusan Biologi
Fakultas Sains dan Matematika, Universitas Diponegoro, Tembalang, Semarang
Pengembangan tanaman jabon (A. cadamba Miq) dapat dilakukan secara vegetatif, salah satunya adalah melalui stek yang diinduksi dengan memberikan zat pengatur tumbuh (ZPT) tanaman. IBA adalah Jenis hormon yang terkandung dalam zat pengatur tumbuh tanaman Root-Up dan Super-GA, yang berperan dalam merangsang pertumbuhan dan perkembangan akar sehingga mampu mendukung pertumbuhan tanaman. Pemberian Zat penatur tumbuh (ZPT) tanaman dapat meningkatkan panjang dan jumlah akar stek tanaman, begitu pula dengan kemampuan bertunas tanaman. Penelitian ini bertujuan untuk mengetahui pengaruh jenis zat pengatur tumbuh (ZPT) yang paling baik dalam merangsang pembentukan akar dari stek tanaman jabon (A. cadamba Miq). Penelitian ini menggunakan Rancangan Acak Lengkap dengan 3 perlakuan yaitu kontrol, Root-Up Cair, Super-GA, dan 8 pengulangan. Berdasarkan uji DMRT dengan taraf signifikasi 95% menunjukkan bahwa pemberian zat pengatur tumbuh (ZPT) berpengaruh terhadap panjang akar stek, diameter stek dan tinggi tunas. Zat pengatur tumbuh (ZPT) yang paling baik dalam merangsang pertambahan jumlah akar adalah jenis Super-GA, sedangkan untuk diameter dan pertumbuhan tunas zat pengatur tumbuh (ZPT) yang paling baik adalah Root-Up cair dan Super-Ga.
Keywords: Stek, Jabon (Anthocephalus cadamba Miq), Zat Pengatur Tumbuh (ZPT).
JURNAL SAINS DAN MATEMATIKA
2014-03-25 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8005
JURNAL SAINS DAN MATEMATIKA; Volume 20 Issue 2 Year 2012
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8038
2015-09-19T16:48:56Z
sm:Art
"150109 2015 eng "
0854-0675
dc
Aplikasi Bio-Ekologi Makrobenthos sebagai Indikator Tingkat Kesuburan Tambak
Muhammad, Fuad
Jurusan Biologi, FMIPA, Universitas Diponegoro
Hidayat, Jafron Wasiq
Jurusan Biologi, FMIPA, Universitas Diponegoro
Mukid, M. Abdul
Jurusan Statistik, FMIPA, Universitas Diponegoro
Makrobenthos that live in the mangrove forest can be used to predict the role or contribution of mangrove ecosystems as a source of natural food for the environment. The aims of research to determine the structure, composition, abundance, diversity makrobenthos of the mangrove ecosystem. The study was conducted by comparing the community structure makrobenthos in pond ecosystem with mangrove vegetation constituent . The location of this study include three areas , Mangunharjo ( Semarang), Surodadi ( Demak ) and Pasarbangi. The result can shows makrobentos species composition is dominated by gastropods ( 18 species) , Bivalvia ( 13 species ) , Polychaeta ( 3 types ) , and crustaceans ( 2 types ) . Cerithium and Littorina scabra is a type that has a high density of the mangrove ecosystem . There are differences in the abundance and diversity of plankton and makrobenthos at three study sites. In general Pasarbangi Coast has the highest abundance and diversity . Macrozoobenthos community structure in mangrove ecosystems that exist in the three study sites in a stable state , species diversity and distribution of the number of individuals of each type of uniform . Pasarbangi area with mangrove vegetation polyculture farms , have high primary productivity . This shows the level of primer productivity at the site is also high.
Keywords: community structure, macrobenthos, pond ecosystem
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8038
JURNAL SAINS DAN MATEMATIKA; Volume 21 Issue 3 Year 2013
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3028
2015-09-30T13:14:49Z
sm:Art
0854-0675
dc
KUALITAS DAN MORFOLOGI HASIL ELEKTRODEPOSISI KOBAL PADA SUBSTRAT TEMBAGA TERHADAP PENGARUH RAPAT ARUS DAN ASAM BORAT
Huriati, Siti Elin
Universitas Diponegoro
Haris, Abdul
Universitas Diponegoro
Widodo, Didik Setiyo
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
ABSTRAK--Telah dilakukan penelitian tentang pengaruh rapat arus dan asam borat terhadap kualitas dan morfologi hasil elektrodeposisi kobal pada substrat tembaga. Elektrodeposisi kobal pada substrat tembaga dilakukan selama 1 jam dengan anoda karbon dan katoda tembaga pada larutan tanpa asam borat dan penambahan asam borat 1,20 M dengan variasi rapat arus 0,005; 0,010; 0,015; 0,020; 0,025 A/cm2. Hasil elektrodeposisi dianalisis menggunakan Atomic Absorption Spectrophotometry (AAS), Scanning Electron Microscopy (SEM) dan Energy Dispersive X-ray Spectroscory (EDS). Hasil analisis AAS menunjukkan bahwa kandungan logam kobal meningkat seiring dengan meningkatnya rapat arus. Hasil analisis SEM menunjukkan morfologi endapan dengan penambahan asam borat menghasilkan diameter dan
ketebalan yang lebih kecil dengan butiran endapan yang lebih rata dan halus. Hasil analisis EDS menunjukkan komposisi endapan dengan penambahan asam borat memiliki kemurnian lebih tinggi yakni sebesar 100 %. Keberadaan asam borat mampu meningkatkan kualitas dan morfologi endapan kobal.
Kata kunci: elektrodposisi, kobal, asan borat, rapat arus.
Permalink : http://ejournal.undip.ac.id/index.php/sm/article/view/3028
JURNAL SAINS DAN MATEMATIKA
2010-04-02 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3028
JURNAL SAINS DAN MATEMATIKA; Volume 18 Issue 2 Year 2010
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8047
2015-10-14T09:48:02Z
sm:Art
"150112 2015 eng "
0854-0675
dc
Sintesis Etil Sinamat dari Sinamaldehid pada Minyak Kayu Manis (Cinnamomum cassia) dan Uji Aktivitas sebagai Antidiabetes
Amalia, Dian
Kimia Organik, Jurusan Kimia, Universitas Diponegoro Semarang
Ngadiwiyana, Ngadiwiyana
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Fachriyah, Enny
Kimia Organik, Jurusan Kimia, Universitas Diponegoro Semarang
Minyak kayu manis diperoleh dengan cara distilasi dari kulit batang kayu manis. Komponen utama dalam minyak kayu manis adalah sinamaldehid (42-75%). Sinamaldehid merupakan senyawa yang memiliki gugus aldehid yang dapat dimodifikasi menjadi gugus ester yang dapat digunakan sebagai antidiabetes. Tujuan penelitian ini adalah mensintesis etil sinamat dari asam sinamat dan menguji aktivitas etil sinamat sebagai antidiabetes. Metode dari penelitian ini adalah oksidasi dan esterifikasi. Etil sinamat diperoleh dari hasil sintesis merupakan cairan berwarna kuning jernih dan berbau harum dengan rendemen sebesar 98,86%. Hasil dari FTIR menunjukkan terbentuknya etil sinamat dengan adanya gugus C-O ester, sedangkan dari hasil GC-MS diperoleh kelimpahan etil sinamat sebesar 99,01%. Hasil uji aktivitas antidiabetes menunjukkan bahwa, senyawa etil sinamat memiliki nilai IC50 sebesar 215,509 ppm.
Keywords: sintesis; oksidasi; esterifikasi; sinamaldehid; antidiabetes.
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8047
JURNAL SAINS DAN MATEMATIKA; Volume 21 Issue 4 Year 2013
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3212
2015-10-14T09:47:43Z
sm:Art
0854-0675
dc
PENGARUH TEMPERATUR PADA SINTESIS ESTER ASAM LEMAK SELULOSA (FACE) MENGGUNAKAN KATALIS Na2CO3
Ismiyarto, Ismiyarto
Universitas Diponegoro
Rejeki, Sri
Universitas Diponegoro
Ngadiwiyana, Ngadiwiyana
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
ABSTRAK-Polimer sintetik sebagian besar dibuat dari bahan tambang sepeti minyak bumi yang tidak dapat diperbaharui (non renewable) dan non biodegradable. Sehingga diperlukan usaha-usaha untuk membuat polimer biodegradable, seperti polimer ester asam lemak karbohidrat. Minyak nabati seperti minyak biji kapuk merupakan bahan terbarukan yang dapat diubah menjadi metal ester asam lemak dan sangat berpotensi sebagai bahan baku berbagai macam industry. Senyawa ester asam lemak selulosa (FACE) dapat disintesis dari metil ester asam lemak (FAME). Tujuan penelitian ini adalah mengetahui pengaruh temperature reaksi tertadap sintesis FACE menggunakan katalis Na2CO3. Penelitian ini dilakukan dalam beberapa tahap, diawali dengan penurun kadar asam lemak bebas (FFA) dengan metode ekstraksi pelarut menggunakan etanol. Analisis GC-MS untuk mengetahui komposisi asam lemak penyusunnya. Kemudian dilakukan sintesis FAME dengan katalisator NaOH. Tahap selanjutnya adalah sintesis FACE dari FAME dan selulosa, sintesis FACE ini menggunakan katalis Na2CO3 dalam pelarut metanol dengan variasi temperatur 125oC, 130oC, 135oC, 140oC, 150oC selama 4 jam. FACE yang terbentuk dianalisis menggunakan spektrofotometri FTIR untuk mengetahui derajat transesterifikasinya. Bilangan asarn minyak biji kapuk turun dari 6,65 menjadi 0,665. Berdasarkan data GC-MS dan hasil fragmentasi dari masing-masing puncak dapat diketahui bahwa asam lemak penyusun trigliserida minyak biji kapuk ialah asam linoleat (36,53 %), asam palmitat (20,00 %), asam oleat (18,00 %), dan asam stearat (3,52 %). Rendemen FAME yang dihasilkan sebanyak 17,0538 g dari 20 gram minyak biji kapuk ldentifikasi FACE yang terbentuk menggunakan FTIR ditunjukkan dengan munculnya puncak 1743 cm-1 (C=O) yang diperkuat dengan puncak C-O ester pada 1112 cm-1. FACE yang dihasilkan memiliki derajat transesterifikasi sebesar 0,6048 untuk temperature 130 oC dan 0,6762 untuk temperatur 135 oC. Temperatur optimum sintesis FACE dengan katalis Na2CO3 adalah antara 130 oC – 135 oC.
Keywords: transesterifikasi, s elulasa, Na2CO3, FACE
JURNAL SAINS DAN MATEMATIKA
2009-01-01 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3212
JURNAL SAINS DAN MATEMATIKA; Volume 17 Issue 1 Year 2009
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/9133
2016-05-02T10:08:10Z
sm:Art
"150116 2015 eng "
0854-0675
dc
Modification Effect of Carbon Nanotubes by LiCl (CNTs/LiCl) on the Electrical Conductivity Character
Yuliastuti, Indri
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Pardoyo, Pardoyo
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Subagio, Agus
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Carbon nanotubes have been modified by mass percentage variation of LiCl using reflux method. Mass percentage variation used in this study was 0, 1, 5, and 15%. The purpose of this study was to determine the effect of LiCl dope on the electrical conductivity of carbon nanotubes. This research was used reflux method by heating at 80°C for 24 h. The products produced were in the form of CNTs / LiCl dry powders. The characterization results of FT-IR spectroscopy showed that there was a Li-O bond group in the addition of 1, 5, and 15% LiCl while XRD characterization results did not show any diffraction of lithium chloride. The results of this study showed an increase in electrical conductivity at 15% addition of LiCl which was of 2.69 x 10-3 S/m. Electrical conductivity in the addition of 1% and 5% LiCl decreased (1.17 x 10-6 S/m and 2.64 x 10-6 S/m) from CNTs/LiCl 0% (3.68 x 10-6 S/m) due to the influence of the PVA high resistivity used as an adhesive in the pellets fabrication.
JURNAL SAINS DAN MATEMATIKA
2015-09-16 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/9133
JURNAL SAINS DAN MATEMATIKA; Volume 23 Issue 1 Year 2015
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3264
2015-09-19T17:09:58Z
sm:Art
0854-0675
dc
Pemodelan Regresi untuk Rancangan Percobaan Faktor Tunggal
Ispriyanti, Dwi
Undip
ABSTRAK---Metode Statistik yang sering digunakan dalam percobaan adalah analisis ragam. Dalam tulisan ini akan dibahas analisis ragam dengan pengaruh tetap diselesaikan dengan pendekatan metode regresi,hal itu dapat dilakukan kalau modelnya diindetifikasi secara benar dan kalau langkah-langkah pencegahan telah diambil agar diperoleh persamaan normal yang bebas. Suatu ciri analisis ragam adalah bahwa model analisis ini terparameterisasi secara berlebih (Overparameterized), sehingga perlu membuat kendala terhadap parameter-parameternya. Pendekatan model regresi terhadap masalah analisis ragam mengharuskan peubah bebas X dalam bentuk katagori, yaitu nol dan satu.
Kata kunci : analisis ragam, kendala
JURNAL SAINS DAN MATEMATIKA
2012-04-20 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3264
JURNAL SAINS DAN MATEMATIKA; Volume 15 Issue 2 Year 2007
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/10917
2016-05-02T10:44:57Z
sm:Art
"160502 2016 eng "
0854-0675
dc
The Effect of BaCO3 Compound Changes on the Formation of Magnetic Material BaFe12O19
Priyono, Priyono
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Cahyono, Agung
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Marhaendrajaya, Indras
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Subagio, Agus
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Gunawan, Vincensius
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
BaFe12O19 is a permanent magnetic material which has superior properties to be excellent until the late of twentieth century. Some of the obstacles in the synthesis of the material using a stoichiometric composition is a difficulty to obtain a single phase and the second phase is always found. This research attempted to make modifications on the initial non-stoichiometric composition by varying the fraction of Ba/Fe through BaCO3 and Fe2O3 compound through solid state reaction mechanism. This solid state reaction was initiated by mixing various fractions of BaCO3 and Fe2O3 powder composition and compacted to produce a homogeneous mixture using a planetary milling. After drying and molding, it was obtained a homogeneous mixture like a cylinder with a diameter of 2:54 cm and a thickness of 0.5 cm. The BaFe12O19 phase was obtained by heating the sample at a temperature of 1200 ° C for 4 hours. To determine changes in the fraction of Ba/Fe before and after sintering, the samples were tested by X-Ray Fluorescence (XRF), while the structure and crystallinity were tested by X-ray diffraction (XRD) and Scanning Electron Microscope (SEM). The results showed that during the heating process, the reduction of barium fractions exceeded 5% from of their initial weight, while changes in the fraction of Fe was not significant. The results of structure and crystallinity measurement showed that the addition a substantial amount of barium carbonate can lead to the decrease of crystallinity from 35.271 nm to 11.265 nm.
JURNAL SAINS DAN MATEMATIKA
2016-05-02 10:45:02
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/10917
JURNAL SAINS DAN MATEMATIKA; Volume 23 Issue 4 Year 2015
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3381
2015-10-14T09:54:43Z
sm:Art
0854-0675
dc
Learning Vector Quantization Pada Pengenalan Pola Tandatangan
Mubarika, Sofia
Undip
Munir, M.
Undip
Firdausi, Ketut Sofjan
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Widarto, Widarto
Undip
ABSTRACT---In this paper, we analyze and compute distribution of thermal neutron flux in core of Kartini’s Reactor using “Swadaya” detector, both for axial (function of z) and radial (function r) direction. First, “Swadaya” detector is calibrated by activation plate method, which the output from detector is current. The result of calibration is thermal neutron flux (ф) dependent on current (I) that can be written as ф = 4,57x1020I - 2,74x1011. Distribution for neutron thermal flux for axial direction and radial direction respectively
Ф = 5,10 x 1012 + 5,99 x 1013 and ф = 1.08 x 1012 + 1,00 x 103
which in reactor core ф has largest value in center position for radial direction.
Keywords: flux neutron distribution, nucleus reactor, Swadaya detector
JURNAL SAINS DAN MATEMATIKA
2006-10-04 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3381
JURNAL SAINS DAN MATEMATIKA; Volume 14 issue 4 Year 2006
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/7899
2015-10-14T11:39:21Z
sm:Art
"141219 2014 eng "
0854-0675
dc
Zooplankton Diversity and Abundance in Shrimp Pond Ecosystem in the Presence of Sargassum plagyophyllum and Gracilaria verrucosa
Izzati, Munifatul
Biology Department, Faculty of Sciences and Mathematics, Diponegoro University
We studied zooplankton community structure in defferent ecosystem type where different species of aquatic plants are presented. The different in zooplankton community structure can be attributed to different aquatic plant species. We used two different species of aquatic plants, Sargassum plagyophyllum and Gracilaria verrucosa in shrimp pond ecosystem. Every aquatic plant species were replicated three times, and three enclosures without aquatic plant were used as controls. The different in morphological complexity of aquatic plant may affect zooplankton community structure. Our results indicated that the presence of aquatic plant differ in affecting zooplankton community structure. In general, pond with aquatic plant indicate more abundant and diverse of zooplankton. In the presence of Sargassum zooplankton was more abundant compared to the presence of Gracilaria. Whereas with Gracilaria, zooplankton biodiversity index were higher than with Sargassum.
Keywords: zooplankton, sargassum plagyophyllum, Gracilaria verrucosa.
JURNAL SAINS DAN MATEMATIKA
2014-03-11 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/7899
JURNAL SAINS DAN MATEMATIKA; Volume 19 Issue 1 Year 2011
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8051
2015-09-19T10:55:42Z
sm:Art
"150112 2015 eng "
0854-0675
dc
Analisis Fusan Hasil Fusi Protoplas Intraspesies Pichia manshurica DUCC-015 (Analysis of Fusant from Protoplast Fusion Intraspecies of Pichia manshurica DUCC-015)
Roslenawati, Roslenawati
Laboratorium Genetika Jurusan Biologi, Fakultas Sains & Matematika, Universitas Diponegoro
Tembalang, Semarang – 50275
Telepon (024) 7474754; Fax. (024) 76480690
Kusumaningrum, Hermin Pancasakti
Laboratorium Genetika Jurusan Biologi, Fakultas Sains & Matematika, Universitas Diponegoro
Tembalang, Semarang – 50275
Telepon (024) 7474754; Fax. (024) 76480690
Pujiyanto, Sri
Laboratorium Mikrobiologi Jurusan Biologi, Fakultas Sains & Matematika, Universitas Diponegoro
Tembalang, Semarang – 50275
Telepon (024) 7474754; Fax. (024) 76480690
The intraspecies protoplast fusion of P. manshurica DUCC-015 was conducted in searching the fusant with greater inulinase production. Inulinase on Dahlia variabilis Willd tuber from Baturraden-Purwokerto showed inulinase activity 0,683 IU/mL. Inulinase is an enzyme that catalyzes the hydrolysis reaction of inulin polysaccharides into fructose and or fructooligosacarides. The aims of this research was revealing fusant from intraspecies protoplast fusion process of P. manshurica DUCC-015 followed by analyzing of their inulinase productivity and activity. The research metodology protoplast fusion process consist of lysis of cell wall, protoplast fusion and regeneration of intraspecies fusant P. manshurica DUCC-015. Analysis of fusant were done by Schiff Basic Fuchsin staining of fusant nuclei, also measuring the inulinase activity and inulinase production comparing with their parent. The inulinase activity will be analyzed by T-Test Independent Two Sample on 95% Confidence interval of the difference use Statistical Product and Service Solution programme (SPSS). The result of experiment gaining fusant with regeneration capability, ploidi diversity of fusant, inulinase activity about 0,965 IU/mL while their parent 0,622 IU/mL and inulinase production 0,736 IU/mL comparing with 0,731 IU/mL during 42 hours incubations. The fusant indicated the increase of inulinase activity and production compared with their parent.
Keywords: Pichia manshurica DUCC-015, fusant, inulinase
Fusi protoplas intraspesies Pichia manshurica DUCC-015 telah dilakukan untuk mencari fusan dengan produksi inulinase yang lebih tinggi. Inulinase pada umbi tanaman Dahlia variabilis Willd dari Baturraden-Purwokerto memperlihatkan aktivitas sebesar 0,683 IU/mL. Inulinase merupakan enzim yang mengkatalisis reaksi hidrolisis polisakarida inulin menjadi fruktosa dan atau fruktooligosakarida. Penelitian ini bertujuan untuk mendapatkan fusan hasil fusi protoplas intraspesies P. manshurica DUCC-015 yang memiliki aktivitas inulinase lebih tinggi. Rancangan percobaan fusi protoplas terdiri dari isolasi protoplas, fusi protoplas dan regenerasi fusan. Analisis fusan menggunakan pewarnaan Fuchsin pada inti sel, mengukur aktivitas dan produksi inulinase fusan. Aktivitas inulinase dianalisis dengan Uji T Test Dua Sampel Independen pada taraf kepercayaan 95% menggunakan program Statistical Product and Service Solution (SPSS). Hasil penelitian menunjukkan fusi protoplas intraspesies P. manshurica DUCC-015 menghasilkan aktivitas inulinase mencapai 0,965 IU/mL dibandingkan induk sebesar 0,622 IU/mL dan produksi inulinase 0,736 IU/mL pada inkubasi selama 42 jam. Fusan mengindikasikan kenaikan aktivitas dan roduksi inulinasi dibandingkan induk.
Kata kunci : Pichia manshurica DUCC-015, fusan, inulinase.
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8051
JURNAL SAINS DAN MATEMATIKA; Volume 22 Issue 1 Year 2014
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8032
2015-09-30T10:10:09Z
sm:Art
"150109 2015 eng "
0854-0675
dc
Evaluasi Ketebalan Irisan (Slice Thickness) pada Pesawat CT-Scan Single Slice
Makmur, I Wayan Ari
Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro, Semarang, Jawa Tengah
Setiabudi, Wahyu
Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro, Semarang, Jawa Tengah
Anam, Choirul
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
An evaluation of the value of the slice thickness due to changes in tube voltage and tube current on the CT scan have been performed. The evaluation is done by making images using CT performance test phantom. Testing is done by performing three scanning on each slice. Exposure factors used were 120 kVp-60 mA, 160 mA 120-kVp, 140-kVp 60 mA, and 140 kVp 160 mA. Nominal beam width were 2 mm, 3 mm, 5 mm, 7 mm, and 10 mm. Once the axial image was obtained (on the area for slice thickness determination), then calculated the average CT number on the region of interest (ROI). After it was made graphs to determine the value of FWHM which indicates the magnitude of the thickness of the slice. From the test results obtained that changes in tube voltage and tube current does not affect the value of the thickness of the slice. Also found that the value of slice thickness for each thickness, greater than the nominal beam width.
Keywords: Phantom CT Performance Test, Slice Thickness, CT-Scan
Telah dilakukan evaluasi terhadap nilai slice thickness terhadap perubahan tegangan tabung dan arus tabung pada pesawat CT scan. Pengujian dilakukan dengan membuat citra menggunakan fantom CT performance test. Pengujian dilakukan dengan melakukan eksposi sebanyak tiga kali pada tiap-tiap slice. Faktor eksposi yang digunakan yaitu 120 kVp-60 mA, 120 kVp-160 mA, 140 kVp-60 mA, dan 140 kVp-160 mA. Slice thickness yang diuji adalah ketebalan 2 mm, 3 mm, 5 mm, 7 mm, dan 10 mm. Setelah didapatkan citra aksial pada bagian daerah uji slice thickness, maka diambil beberapa lokasi ROI dan dihitung rerata CT Number, kemudian nilai tersebut dibuat grafik dan ditentukan nilai FWHM yang menunjukkan besarnya slice thickness. Dari hasil pengujian diketahui perubahan tegangan tabung dan arus tabung tidak berpengaruh terhadap nilai slice thickness. Hasil pengukuran diketahui bahwa nilai slice thickness untuk masing-masing ketebalan, lebih besar dibanding nominal beam width.
Kata kunci : Simulasi Monte Carlo, Percentage Depht Dose (PDD), Dose Profile, Inhomogenitas Jaringan.
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8032
JURNAL SAINS DAN MATEMATIKA; Volume 21 Issue 2 Year 2013
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8057
2015-09-19T10:54:02Z
sm:Art
"150113 2015 eng "
0854-0675
dc
Perkembangan Mikrobia Rumen dari Hasil Uji Biologis Pellet Complete Calf Starter pada Pedet Friesian Holstein Pra Sapih
Maharani, N.
Mahasiswa Pasca Sarjana Magister Ilmu Ternak Universitas Diponegoro
Achmadi, J.
Dosen Jurusan Peternakan Universitas Diponegoro
Mukodiningsih, S.
Dosen Jurusan Peternakan Universitas Diponegoro
Penelitian bertujuan untuk mengkaji kualitas dari formula Complete Calf Starter (CCS) dengan molases 5% sebagai pengganti susu terhadap perkembangan mikrobia rumen pedet Friesian Holstein (FH) pra sapih. Materi yang digunakan adalah 20 ekor pedet sapi FH yang terdiri dari 14 ekor betina dan 6 ekor jantan pra sapih umur 2 minggu dengan bobot badan rata-rata 45±5 kg, bahan pakan yang terdiri atas jagung giling, dedak halus, bungkil kedelai, jerami jagung, molases dan mineral. Penelitian dirancang secara deskriptif non parametrik. Variabel yang diamati adalah total bateri dan total protozoa. Hasil yang diperoleh menunjukkan bahwa total populasi bakteri cairan rumen pada pedet umur 2 minggu sebesar 80x106 kol/ml, umur 4 minggu sebesar 40x106 ; 50x106 kol/ml dan umur 6 minggu sebesar 20x106 ; 18x106 kol/ml. Total protozoa cairan rumen pada pedet umur 2 minggu sebesar 3,52x106 sel/ml, umur 4 minggu sebesar 2,13x106 sel/ml ; 1,41x106 sel/ml dan umur 6 minggu sebesar 1,61x106 ; 1,12 x106 sel/ml. Berdasarkan hasil yang diperoleh dapat disimpulkan bahwa CCS bentuk pellet mampu menstimulasi perkembangan rumen (total bakteri, total protozoa, pH dan konsumsi pakan) pedet FH pada umur 2 minggu namun pada umur 4 dan 6 minggu jumlah total bakteri menurun.
Keywords: Complete Calf Starter, total bakteri, total protozoa.
JURNAL SAINS DAN MATEMATIKA
2014-04-16 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8057
JURNAL SAINS DAN MATEMATIKA; Volume 22 Issue 2 Year 2014
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8018
2018-08-21T07:16:43Z
sm:Art
"150109 2015 eng "
0854-0675
dc
Perbandingan Algoritma Particle Swarm Optimization dan Differential Evoluitonal Algorithm untuk Perancangan Umpan Balik Keadaan : Studi Kasus Gerak Lateral Pesawat F-16
Anis, Madchan
Jurusan Matematika Universitas Diponegoro
Jl. Prof. Soedharto, SH, Tembalang Semarang 54275
Widowati, Widowati
Mathematics Department, Faculty of Sciences and Mathematics, Dipongoro University
Tjahjana, R. Heru
Jurusan Matematika Universitas Diponegoro
Jl. Prof. Soedharto, SH, Tembalang Semarang 54275
The purpose of Linear Quadratic Regulator (LQR) optimal control system is to stabilize the system, so that the output of the system towards a steady state by minimizing the performance index. LQR-invinite horizon is a special case of LQR in thecontinuous time area where the terminal time of the performance index value for infinite time and infinite outputsystem is zero. Performance index will be affected by the weighting matrix. In this paper will be discussed about the application of Particle Swarm Optimization algorithm (PSO) and Differential Evolution Algorithm (DEA) to determine the state feedback of a closed loop system and weighting matrices in the LQR to minimize performance index. PSO algorithm is a computational algorithm inspired by social behavior of flocks of birds and fishes in searching of food. While the DEA is an optimization algorithm that is adopted from evolution and genetics of organisms. Simulations of the PSO algorithm will be compared with DEA. From the simulations results is found thatDEA is faster then PSO to get convergence to the optimal solution.
Keywords: LQR-invinite horizone, Particle Swarm Optimization (PSO), Differential Evolution Algorithm (DEA), umpan balik keadaan, sistem lup tertutup
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8018
JURNAL SAINS DAN MATEMATIKA; Volume 20 Issue 4 Year 2012
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3142
2015-09-19T17:06:15Z
sm:Art
0854-0675
dc
KEANEKARAGAMAN ASPERGILLUS PADA BERBAGAI TRADISIONAL SIMPLISIA JAMU
Rukmi, Isworo
Universitas Diponegoro
ABSTRACT---The presence of Aspergillas sp. in the simplisia commonly consumed by Javanese people as a traditional medicine has been done. The eight simplisia examined were: kunyit rhizome (Cucurma domesfica Val.), temuireng rhizome (Cucurma aeroginosae), daun sambiloto (Andrographis paniculata), temulawak rhizome (Cucurma xanthorhizu), and mahkota dewa (Phaleria macrocarpa). Sixteen Aspergillus species were found from the samples, came from the niger, flavus, versicolor, wentii, fumigatus, ochraceus dan ornatus group. Isolates found in this study were A. parositicus, A. flavas, A. oryzae, A. tamarin, A. clavato-flavus, A. flavofurcatis, A. tubingiensis, A. awamori, A. ochraceus, A. sulphureus, A. melleus, A. ornatus, A. brunneo-uniseriatus, A. versicolor, A. wentii, and A. fumigatus, the first six are the member of flavus group that found in all simplisia samples. Nine species of the isolates
known as mycotoxin producers.
Keywords : Aspergillus, simplisia, mikotoksin
JURNAL SAINS DAN MATEMATIKA
2010-10-22 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3142
JURNAL SAINS DAN MATEMATIKA; Volume 17 Issue 2 Year 2009
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/9006
2015-10-14T09:39:36Z
sm:Art
"141015 2014 eng "
0854-0675
dc
Lactose Bioelectricity on A Microbial Fuel Cell System Parallel Circuit using Lactobacillus bulgaricus
Putra, Adi
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Nuryanto, Rahmad
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Suyati, Linda
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Electrical energy needs in Indonesia is estimated to continue growing by 4.6% per year, and if there is nothing to be done to increase the production of electric energy, this figure will increase threefold by 2030. Microbial Fuel Cells (MFC) is one way to produce alternative electric energy by utilizing organic material as a substrate for bacterial metabolic activity that generate electricity. The aim of this study is to examine lactose bioelectricity in a parallel circuit MFC system using Lactobacillus bulgaricus to generate electrical energy. The principle of this study is bioelectrochemistry which is the chemical energy change into electrical energy involving redox reactions by utilizing microbes. This study used a dual chamber MFC system with salt bridge as a connector and conductor of protons from the cathode compartment to the anode compartment. An anode compartment contained the bacteria Lactobacillus bulgaricus and lactose substrate, while the cathode compartment contained electrolyte solution KMnO4 0.2 M and phosphate buffer solution with pH = 7. This study used a single circuit, parallel circuit 1 with 2 cells, and a parallel circuit 2 with 3 cells which were oriented to enlarge the produced electricity current. Bioelectricity of lactose produced power in a single series, parallel 1 and parallel 2 respectively were 72.58 x10-6 mWatt; 155.77 x10-6 mWatt; 270.28 x10-6 mWatt where the power generated was proportional to the parallel circuit electric current. Hence by the same potential difference, the power magnitude in parallel circuit 1 approached twice to the single circuit and the power magnitude in parallel circuit 2 approached three times to the single circuit
JURNAL SAINS DAN MATEMATIKA
2015-08-30 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/9006
JURNAL SAINS DAN MATEMATIKA; Volume 22 Issue 4 Year 2014
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3259
2015-09-19T17:08:24Z
sm:Art
0854-0675
dc
Kemampuan Ligan Hipoxantin dan Quanin untuk Ekstraksi Kation Perak pada Fasa Air- Kloroform
Suhartana, Suhartana
UNDIP
ABSTRAK---Perak adalah merupakan jenis logam mulia, dapat dipakai untuk pelapis logam. Salah satu cara untuk dekonsentrasi kation cadmium dengan membuat senyawa kompleksnya, lalu diekstrak dalam pelarut organik. Dengan ligan Hipoksanthin perak dapat mengalami penurunan kadar sekitar 69,63 %, sementara dengan ligan quanin perak dapat mengalami penurunan kadar sekitar 69,92 %.
Kata kunci: Perak, dekonsentrasi dan senyawa kompleks.
JURNAL SAINS DAN MATEMATIKA
2007-01-01 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3259
JURNAL SAINS DAN MATEMATIKA; Volume 15 Issue 1 Year 2007
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/9276
2015-10-14T09:56:46Z
sm:Art
"150715 2015 eng "
0854-0675
dc
Role of Saturated Fatty Acid (SFA) for Degradation of Oil Quality
Firdausi, Ketut Sofjan
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
In this study, the phenomena of natural polarization has been used as a preliminary test of vegetable oil quality. The formation of saturated fatty Acid (SFA) has been studied as a most responsible parameter for degradation of oil quality related to its expired limitation. The Oil quality was indicated by change of light polarization, and was measured using pair of polarizer-analyser. The result shows that the change of polarization can be used to indicate oil quality level related to its expiration date. This method also shows predicted SFA formation and apparently it is relative more powerful than standard parameters such as free fatty acid (FFA) test and peroxide value (PV) test. For future, this method has provided good prospect to evaluate the existence of the halal level of oil due to lard (pig oil).
Keywords: natural polarization, vegetable oil quality, saturated fatty acid (SFA)
JURNAL SAINS DAN MATEMATIKA
2015-10-14 09:33:37
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/9276
JURNAL SAINS DAN MATEMATIKA; Volume 23 Issue 3 Year 2015
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3280
2015-09-19T17:11:12Z
sm:Art
0854-0675
dc
UJI EKSTRAK BAWANG BOMBAY TERHADAP ANTI BAKTERI GRAM NEGATIF Pseudomonas aeruginosa DENGAN METODE DIFUSI CAKRAM
Wuryanti, Wuryanti
Undip
Murnah, Murnah
Undip
ABSTRACT---Microbe is a microscopic living organism which is closely linked to human life. One of patogenic microorganisms such as Pseudomonas aeruginosa may cause diseases. Sulfure of several plants are bioactive as antimicrobial. The properties of sulfure in Allium cepa L leads to an assumption that it has antimicrobial properties. Therefore, this study involved the antimicrobial test. The determination steps of antimicrobial Allium cepa L extract consisted of the Allium cepa L extract preparation, microbial regeneration and antimicrobial test. The antibacterial determination were performed by paper disk method. Based on the research data, determination of antimicrobial white Allium cepa L extract resulted in inhibition zone area showed that the extract owned antimicrobial property.
Key words : Allium cepa L, sulfure, Pseudomonas aeruginosa
JURNAL SAINS DAN MATEMATIKA
2012-04-23 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3280
JURNAL SAINS DAN MATEMATIKA; Volume 17 Issue 3 Year 2009
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/6255
2015-09-30T15:56:03Z
sm:Art
"140226 2014 eng "
0854-0675
dc
ANALISIS KESTABILAN PERSAMAAN DIFERENSI TAK LINIER
Uswatun, Indah
Program Studi Matematuka Jurusan Matematika FMIPA UNDIP
Jl. Prof. H. Soedarto, S.H., Semarang, 50275
Sutimin, Sutimin
Mathematics Department, Faculty of Sciences and Mathematics, Diponegoro University
ABSTRAK---Analisis kestabilan dari persamaan diferensi tak linier dilakukan melalui uji teorema yaitu dengan menyelidiki titik setimbang x *. Analisis kestabilan dari fungsi diferensi f dalam teorema teoremayang telah dikaji menunjukkan bahwa jika |f '(x*)| < 1 berarti titik setimbang stabil asimtotik, sedangkan jika |f '(x*)| > 1 maka titik setimbang tidak stabil, kemudian jika |f '(x*)| = 1, kestabilan dari titik setimbang belum bisa disimpulkan. Di sini akan dikaji kestabilan dari titik setimbang pada kasus dimana |f '(x*)| = 1. Kajian dilakukan dengan memperhitungkan faktor f ' '(x*) dan f ' ' '(x*) sehingga pada akhirnya dapat disimpulkan kestabilan dari titik setimbang x*. Analisis kestabilan juga dapat dilakukandengan diagram Cobweb. Untuk persamaan diferensi logistik, kestabilan titik setimbang bergantung pada nilai dari parameter .
Kata kunci: kestabilan, persamaan diferensi, titik setimbang, diagram Cobweb.
JURNAL SAINS DAN MATEMATIKA
2014-02-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/6255
JURNAL SAINS DAN MATEMATIKA; Volume 18 Issue 4 Year 2010
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/7999
2015-09-30T15:46:06Z
sm:Art
"150107 2015 eng "
0854-0675
dc
Isolasi Senyawa dari Ekstrak Heksan Purwoceng (Pimpinella alpine Molk) dan Toksistasnya dengan BSLT
Marini, Marini
Laboratorium Kimia Organik Jurusan Kimia, Fakultas Sains dan Matematika Undip, Semarang
Jalan Prof. Soedarto, Tembalang, Semarang 50275, Telepon (024) 7474754
Suzery, Meiny
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Tanaman Purwoceng (Pimpinella alpina Molk) meskipun telah lama digunakan sebagai obat tradisional, namun belum banyak dilakukan eksplorasi komponen kimiawinya. Pada penelitian ini dilakukan isolasi dan uji toksisitas dari ekstrak heksan Pimpinella alpine Molk.
Metoda pemisahan dan pemurnian dilakukan dengan menggunakan teknik kromatografi kolom vakum (KKV) dan analisis struktur dengan GC-MS. Uji toksisitas dilakukan menggunakan metoda BSLT (Brine shrimp lethality Test).
Hasil KKV diperoleh tiga fraksi (A, B dan C) dan hasil pemisahan bertahap terhadap fraksi C diperoleh cairan berwarna kuning. Hasil analisis dengan GC-MS tedapat 15 puncak dengan komponen mayor meliputi 2-tetradecena, 4-cosena, 2-cosena dan 6-tetracosena. Nilai LC 50 dari ekstrak total heksan dan fraksi A, B dan C berturut-turut sebesar 11,07 µg/mL, 198,71 µg/mL , 29005,71 µg/mL dan 18900.36 µg/mL.
Dari nilai LC 50 diketahui bahwa fraksi C bersifat tidak toksik dibandingkan dengan fraksi lainnya.
Keywords: purwoceng, pimpinella alpina Molk, ekstrak heksan, BSLT
JURNAL SAINS DAN MATEMATIKA
2014-03-24 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/7999
JURNAL SAINS DAN MATEMATIKA; Volume 20 Issue 1 Year 2012
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8021
2018-08-21T07:16:43Z
sm:Art
"150109 2015 eng "
0854-0675
dc
Analisis Kandungan Kadmium (Cd) dalam Tanaman Bawang Merah dari Tegal
Kusumaningrum, Hermin Pancasakti
Genetics Laboratory, Faculty of Mathematics and Natural Sciences, Diponegoro University, Jl. Prof. Soedarto, UNDIP, Tembalang, Semarang. 50275.
Herusugondo, Herusugondo
Microbiology Laboratory, Faculty of Mathematics and Natural Sciences, Diponegoro University, Jl. Prof. Soedarto, UNDIP, Tembalang, Semarang. 50275.
Zainuri, Muhammad
Microbiology Laboratory, Faculty of Mathematics and Natural Sciences, Diponegoro University, Jl. Prof. Soedarto, UNDIP, Tembalang, Semarang. 50275.
Raharjo, Budi
Microbiology Laboratory, Faculty of Mathematics and Natural Sciences, Diponegoro University, Jl. Prof. Soedarto, UNDIP, Tembalang, Semarang. 50275.
Ketergantungan pestisida pada sentra produksi bawang merah Kabupaten Tegal telah menimbulkan pencemaran logam berat kadmium (Cd) di dalam tanah dan tanaman bawang merah. Kadar logam tersebut telah melebihi ambang batas yang dapat mengganggu kesehatan manusia. Tujuan penelitian ini adalah melakukan analisis kandungan kadmium pada akar, daun dan umbi tanaman bawang merah dari Tegal. Metode penelitian dilakukan melalui analisis kandungan logam berat kadmium dalam tanaman bawang merah dibandingkan dengan kontrol menggunakan metode spektrofotometri atom absorbansi (AAS). Hasil penelitian memperlihatkan kandungan kadmium pada umbi, daun dan akar bawang merah di Tegal pada umur 20 hari berturut-turut adalah sebagai berikut 3,4805 mg/g; 4,1374 mg/g dan 7,9175 mg/g. Kandungan kadmium pada umbi, daun dan akar bawang merah umur 50 hari atau usia panen berturut-turut adalah sebagai berikut 1,8331 mg/g; 1, 8331 mg/g dan 3,5323 mg/g. Hasil penelitian yang diperoleh menunjukkan konsentrasi kadmium yang melampaui batas ambang aman bagi makanan, kesehatan dan lingkungan.
Pesticide dependence on onion production centers Tegal has caused heavy metal pollution of cadmium (Cd) in the soil and plant onions. This metal content exceeds the threshold that can impair human health. The purpose of this study was to analyze lead content in root, leaves and bulb of red onion from Tegal. Research methods to analyze the content of heavy metals in the soil compared to the control using atomic absorbance spectrophotometry (AAS). The research results showed lead content in roots, leaves and roots of onion at the age of 20 days in a row is as follows 3,4805 mg/g; 4,1374 mg/g and 7,9175 mg/g. The results obtained shows that cadmium concentrations exceed safe thresholds for food, health and the environment.
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8021
JURNAL SAINS DAN MATEMATIKA; Volume 20 Issue 4 Year 2012
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8053
2015-09-30T10:07:14Z
sm:Art
"150112 2015 eng "
0854-0675
dc
Penentuan Entrance Skin Exposure (ESE) pada Pesawat Mammografi Mammomat 1000 dengan Filter Molybdenum (Mo) dan Rhodium (Rh)
Susanti, Fitri
Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro, Semarang, Jawa Tengah
Anam, Choirul
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Setiawati, Evi
Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro, Semarang, Jawa Tengah
Mammography is a radiographic examination to detect breast cancer earlier. However, the usage of radiation with low kVp can cause high dose and this becomes the reason why monitoring the dosage during the mammography process is an important thing to do. One of the techniques to monitor the radiation level is done based on the Entrance Skin Exposure (ESE) value. This research was aimed to determine the ESE value using molybdenum (Mo) and rhodium (Rh) as the filter at Mammomat 1000 mammographics system.The research was started by measuring the consistency of the X-ray tube voltage (kVp ). After that, the ESE value at the target/filter Mo/Mo and Mo/Rh was measured using a Barracuda Multi Purpose Detector (MPD). The tube voltage during the research was 26, 28, and 30 kVp with fixed electrical current-time 100 mAs. The result shows that ESE value resulted at the target/filter Mo/Mo and Mo/Rh is tolerable, except at tube voltage 30 kVp with target/filter Mo/Mo. The comparison of ESE value shows that Mo/Rh has lower ESE value than Mo/Mo.
Keywords: Entrance Skin Exposure (ESE), mammography, Barracuda Multi Purpose Detector (MPD)
Pemeriksaan mammografi merupakan tindakan efektif dalam mendeteksi adanya kanker payudara sejak dini. Namun demikian, penggunaan teknik radiasi dengan kVp rendah pada mammografi dapat menyebabkan dosis tinggi. Oleh karena itu, pemantauan dosis pada pemeriksaan mammografi sangat penting dilakukan. Salah satu teknik pemantauan dosis radiasi dapat dilakukan dengan nilai Entrance Skin Exposure (ESE). Penelitian ini bertujuan untuk menentukan nilai ESE dengan filter molybdenum (Mo) dan rhodium (Rh) pada pesawat mammografi Mammomat 1000. Penelitian diawali dengan pengukuran konsistensi keluaran tegangan tabung sinar-X (kVp output). Selanjutnya dilakukan pengukuran nilai ESE pada target/filter Mo/Mo dan Mo/Rh dengan menggunakan Multi Purpose Detector (MPD) merek Barracuda. Tegangan tabung yang digunakan dalam penelitian yaitu 26, 28 dan 30 kVp dengan arus-waktu tabung tetap yaitu 100 mAs. Hasil penelitian menunjukan bahwa nilai ESE yang dihasilkan pada target/filter Mo/Mo dan Mo/Rh masih berada dalam batas toleransi yang direkomendasikan, kecuali pada pada tegangan tabung 30 kVp untuk Mo/Mo. Hasil perbandingan nilai ESE menunjukan bahwa Mo/Rh memiliki nilai ESE yang lebih rendah dibandingkan dengan Mo/Mo.
Kata kunci : Entrance Skin Exposure (ESE), mammografi, Multi Purpose Detector (MPD) Barracuda.
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8053
JURNAL SAINS DAN MATEMATIKA; Volume 22 Issue 1 Year 2014
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/7995
2016-05-02T09:51:10Z
sm:Art
"150107 2015 eng "
0854-0675
dc
Antibakteri Fotokatalis TiO2:KA untuk Sterilisisasi Air yang Tercemar Bakteri Escherichia Coli
Taftiari, M F
Laboratorium Fisika Material Jurusan Fisika Fakultas Sains dan Matematika, Universitas Diponegoro
Jl. Prof. Sudharto SH, Tembalang Semarang 50275
Subagio, Agus
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Nurhasanah, I
Laboratorium Fisika Material Jurusan Fisika Fakultas Sains dan Matematika, Universitas Diponegoro
Jl. Prof. Sudharto SH, Tembalang Semarang 50275
TiO2 yang dilapiskan pada karbon aktif granular (TiO2:KA) telah digunakan untuk mereduksi bakteri Escherichia coli (E. Coli) dalam air. Serbuk TiO2 merupakan material fotokatalis yang dapat mengurai polutan organik, seperti: bakteri E. Coli. Namun penggunaannya masih memerlukan proses pemisahan TiO2 dari air. KA telah banyak digunakan sebagai penyerap polutan dalam proses penjernihan air. Pada penelitian ini KA granular digunakan sebagai media tempat pelapisan TiO2 untuk mereduksi bakteri E. coli. TiO2:KA diperoleh dengan mencelupkan KA ke dalam larutan TiO2 kemudian dikeringkan pada temperatur 100oC selama 30 menit. Mikrostruktur TiO2:KA diamati menggunakan x-ray difractometer (XRD) dan scanning electron microscope (SEM). Kemampuan fotokatalis TiO2:KA dalam mereduksi E. coli diuji menggunakan total plate count (TPC) terhadap air yang telah melalui proses fotokatalis berbantuan sinar UV. Citra SEM menunjukkan adanya bulir-bulir pada permukaan KA yang mengindikasikan TiO2 berhasil dilapiskan pada KA. Hal ini diperkuat dengan pola difraksi yang menunjukkan struktur anatase TiO2. Jumlah bakteri E. coli yang tereduksi meningkat seiring dengan lama waktu proses fotokatalis. Proses fotokatalis TiO2:KA selama 3 jam berhasil menghilangkan 100% bakteri E. coli dalam air. Hasil ini menunjukkan efektivitas antibakteri fotokatalis TiO2:KA untuk sterilisasi air dari bakteri E. coli.
Keywords: antibakteri, Escherichia coli, fotokatalis, TiO2:KA
JURNAL SAINS DAN MATEMATIKA
2014-03-24 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/7995
JURNAL SAINS DAN MATEMATIKA; Volume 20 Issue 1 Year 2012
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3137
2015-09-19T17:06:47Z
sm:Art
0854-0675
dc
BCK-ALJABAR HIPER
Yunitasari, Dewi
Universitas Diponegoro
Suryoto, Suryoto
Universitas Diponegoro
ABSTRAK---Suatu BCK-aljabar hiper dapat dipandang sebagai BCK-aljabar dimana peran operasi biner yang berlaku pada BCK-aljabar diambil alih oleh operasi hiper yang berlaku pada BCK-aljabar hiper. Kemudian karena operasi hiper merupakan pemetaan dari himpunan ke keluarga himpunan sehingga operasi hiper yang berlaku pada BCK-aljabar hiper merupakan pemmuman dari operasi biner yang berlaku pada BCK-aljabar. Karena BCK-aljabar hiper dapat dipandang sebagai BCK-aljabar sehingga sifat-sifat yang berlaku pada
BCK-aljabar juga berlaku pada BCK-aljabar hiper. Dengan menggunakan sifat-sifat yang berlaku pada BCK-aljabar, akan dibuktikan sifat-sifat yang berlaku pada BCK-aljabar hiper. Kemudian diberikan juga relasi yanglebih khusus yang berlaku pada BCK-aljabar hiper yang dinamakan relasi hiper.
Kata kunci : BCK-aljabar, BCK-aljabar hiper, operasi hiper, relasi hiper.
Permalink : http://ejournal.undip.ac.id/index.php/sm/article/view/3137
JURNAL SAINS DAN MATEMATIKA
2010-04-02 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3137
JURNAL SAINS DAN MATEMATIKA; Volume 18 Issue 2 Year 2010
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/9001
2015-08-30T09:30:10Z
sm:Art
"140715 2014 eng "
0854-0675
dc
Comparative Study of Characteristicsof Sediment and Water Qualityin Aquaculture Farming Systems Area with Coastal Area Adjacent to Industrial Activities
Putro, Sapto Purnomo
Diponegoro University
Febria, Ibni Jeudi
Diponegoro University
Muhammad, Fuad
Diponegoro University
Disturbance of water environment due to organic enrichment caused by farming activities may result in the reduction of water quality and sediments. This study was conducted to determine the condition of the water and sediments in the area of aquaculture in ponds system compared to the adjacent coastal area of industrial activities. Water qualities observed were the temperature, DO, salinity, conductivity, turbidity and pH. Sediment characteristics measured were sediment grain size and organic matter content contained in the sediments. From the research, the temperature values obtained ranged 28.7-32.9°C, DO 3.63 to 6.4 mg/l, pH 4.31 to 6.27, salinity 4.6 to 33 ‰, conductivity 8.5- 50.2 ms/cm, turbidity 73-535 NTU. The substrate grain analysis showed at the fish farm area in pond systems was dominated by silt 71.70% and clay 16.71%. In the coastal area adjacent to the industrial activities, 93.38% substrate was dominated by sand. Analysis of organic matter content in the pond systems exhibited the highest ranged between 0.72% -1.16% for nitrogen and 3.20%-10.35% for carbon. The differences in the composition of the substrate and the organic material can be caused by hydrographic conditions, especially strong/weak water currents, the accumulation of litter originating from the decomposition of leaves of mangrove, enrichment of nutrients during the decomposition of litter and aquaculture activities and industries.
JURNAL SAINS DAN MATEMATIKA
2014-07-15 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/9001
JURNAL SAINS DAN MATEMATIKA; Volume 22 Issue 3 Year 2014
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3232
2015-09-19T17:03:29Z
sm:Art
0854-0675
dc
GRAF SIMETRI LEMAH
Hariyanto, Susilo
Universitas Diponegoro
Sumanto, Y.D.
Universitas Diponegoro
Fatkhurohman, Fatkhurohman
Universitas Diponegoro
ABSTRAK-Diberikan suatu graf sederhana X dengan himpunan semua titiknya V(Y), himpunan semua garisnya E(X). Himpunan semua automorfisme pada graf X dinotasitan Aut X dan semua endomorfisme dinotasikan dengan End X. Dalam artikel ini, akan diidentifikasi apakah graf X merupakan graf simetri atau graf simeti lemah. Untuk mengidentifikasi diperlukan pumahaman tentang grup, semigrup, automorfisme dan endomorfisme dalam graf. Jika pada sembarang pasang titik x,y Є V(X), terdapat pemetaan f Є Aut X sedemikian hingga berlaku f(x) = y maka graf X dikatakan sabagai graf verteks-simetri, sedangkan jika berlaku pada sembarang garis pada X pada graf X dikatakan graf edge-simetri dan jika berlaku pada sembarang titik dan sembarang garis maka disebut graf simetri. Jika pemetaan diambil dan End X maka graf simetri yang diperoleh adalah graf simetri yang diperlemah atau disebut graf simetri lemah.
Kata kunci : autoformisme dan endoformisme pada graf
JURNAL SAINS DAN MATEMATIKA
2009-01-01 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3232
JURNAL SAINS DAN MATEMATIKA; Volume 17 Issue 1 Year 2009
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/9173
2016-05-02T10:09:15Z
sm:Art
"150415 2015 eng "
0854-0675
dc
Synthesis of Carboxyl (CNT-COOH) and Ammine Carbon Nanotubes (CNT-NH2)
Pardoyo, Pardoyo
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Suharini, Sri Eny
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Nandiyah, Siti
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University
Subagio, Agus
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
A research synthesizing CNT-COOH to increase the compatibility character of carbon nanotubes and CNT-NH2 to increase the hydrophilic character has been done. The CNT-COOH was synthesized using ultrasonic bath method for 6 hours with the volume ratio of concentrated H2SO4 : HNO3 were 2:1, 3:1 and 4:1. Whereas CNT-NH2 was produced by refluxing CNT and ethylene diamine at temperature of 40°C, 60°C and 80°C. Both products were analyzed with Fourier Transform Infrared (FTIR), Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray Spectroscopy (EDS). The C=O bond on CNT-COOH was showed by wavenumber of 1635.64 cm-1 and the OH bond at 3448.72 cm-1 whilst the N-H bond emerged at 152762 cm-1. SEM and EDS indicated both products had surface morphology of tubes and reducing of Fe content which was the one of impurities of CNT.
JURNAL SAINS DAN MATEMATIKA
2015-09-19 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/9173
JURNAL SAINS DAN MATEMATIKA; Volume 23 Issue 2 Year 2015
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/3275
2015-09-19T17:10:42Z
sm:Art
0854-0675
dc
EKSISTENSI DAN KETUNGGALAN LAPANGAN HINGGA
Suryoto, Suryoto
UNDIP
ABSTRAK--Lapangan merupakan salah satu bentuk gelanggang yang mempunyai sifat-sifat yang cukup menarik untuk dikaji, khususnya lapangan yang banyaknya unsur berhingga atau yang lebih dikenal dengan lapangan hingga. Yang menarik dari lapangan hingga adalah banyaknya unsur yang terkandung di dalamnya, yang ditentukan sepenuhnya oleh suatu bilangan prima yang merupakan Karakteristik lapangan tersebut. Pada makalah ini akan dikaji eksistensi dan ketunggalan lapangan hingga dengan order atau banyaknya unsur yang terkandung di dalamnya merupakan perpangkatan suatu bilangan prima yang merupakan karakreristiknya, melalui dua buah pendekatan, yaitu pendekatan melalui ruang vektor dan pendekatan dengan suku banyak.
Kata kunci : Karakteristik, order, suku banyak monik tak-tereduksi, ruang vektor
JURNAL SAINS DAN MATEMATIKA
2012-04-23 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/3275
JURNAL SAINS DAN MATEMATIKA; Volume 17 Issue 3 Year 2009
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/6245
2015-10-14T08:52:13Z
sm:Art
"140226 2014 eng "
0854-0675
dc
HISTOGRAM DAN NILAI DERAJAT KEABUAN CITRA THORAKS COMPUTED RADIOGRAPHY (CR) UNTUK PENDERITA TUBERCULOSIS (TB) PARU-PARU
Endahyani, Siti Nur
Instalasi Radiologi, RSUD Salatiga, Jawa Tengah
Adi, Kusworo
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
Anam, Choirul
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University
ABSTRACT---Tuberculosis (TB) is an infectious disease caused by the bacteria mycobacterium tuberculosis. TB is the number one killer among infectious diseases, and even Indonesia occupies the fifth largest country in the world in this disease problem. Detection of TB disease through clinical symptoms, laboratory tests and thoracic imaging (lung) with x-ray. The research was conducted to determine the histogram and the average value of gray scale image of the thoracic patients suffering from TB and who is not. By knowing the value of the histogram and the mean gray scale this can later be used as additional instructions for medical personnel to diagnose, i.e. to determine whether the patient has TB or not. In this research, the exposure factors was carried out with a tube voltage of 55 kV, tube current 200 mA and time 0.08 s, using of the Computed Radiography (CR). Histogram analysis performed on the Region Of Interest (ROI) that is at the apex of the lung and superior lung lobes contained patches of gloom on the image of the thorax. It was obtained that the image histogram from TB patients shifted to the right or the gray scale pixel values have a higher (brighter). The average value of pixel gray scale image of the patient suffering from tuberculosis at 13,3 and for patients who are suffering from TB at 61,6.
Key words: thoracic imaging, Tuberculosis, histogram
ABSTRAK---Penyakit Tuberculosis (TB) merupakan suatu penyakit menular yang disebabkan oleh bakteri mycobacterium tuberculosis. TB merupakan pembunuh nomor satu diantara penyakit menular, bahkan Indonesia menduduki negara terbesar kelima di dunia dalam masalah ini. Deteksi penyakit TB dilakukan melalui gejala klinis, uji laboratorium dan foto thoraks (paru-paru) dengan sinar-x. Penelitian inidilakukan untuk mengetahui histogram dan nilai rerata sekala keabuan citra thoraks pasien yang menderitaTB dan yang bukan. Dengan mengetahui nilai histogram dan nilai rerata sekala keabuan ini nantinya dapat dijadikan petunjuk tambahan bagi tenaga medis untuk menegakkan diagnosa, yaitu untuk menentukan apakah pasien menderita TB atau tidak. Dalam riset ini, eksposi dilakukan pada tegangan tabung 55 kV, arus tabung 200 mA dan waktu 0,08 S, serta menggunakan Computed Radiography (CR). Analisis histogram dilakukan pada Region Of Interest (ROI) yaitu pada daerah apeks paru dan lobus superior paru yang terdapat bercak-bercak kesuraman pada citra thoraks. Dari penelitian diperoleh bahwa histogram citra pasien penderita TB bergeser ke sebelah kanan atau mempunyai nilai skala keabuan piksel yang lebih tinggi (lebih cerah). Nilai rata-rata skala keabuan piksel citra pasien yang menderita TB sebesar 136,3 dan tidak menderita TB sebesar 61,6.
Kata kunci: pencitraan thoraks, Tuberculosis, histogram
JURNAL SAINS DAN MATEMATIKA
2014-02-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/6245
JURNAL SAINS DAN MATEMATIKA; Volume 18 Issue 4 Year 2010
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/7912
2015-09-19T17:01:49Z
sm:Art
"141223 2014 eng "
0854-0675
dc
Pengembangan Teknik Pengambilan Sampel Makrobenthos: Seleksi Alat dan Preparasi
Putro, S.P
Laboratorium Ekologi dan Biosistematika, Jurusan Biologi, Fakultas Sains dan Matematika, Universitas Diponegoro, Jl. Prof. Soedarto, SH, Kampus Tembalang, Semarang INDONESIA
Makrobenthic animals are invertebrates that relatively small (at least 500 µ ) and have short life spans, and play an important role as secondary producers in the structure of the food chain in the water ecosystem. They inhabit substrates/sediment at the bottom of the water column, either at the surface (epifauna) or in the sediment (infauna). Therefore, it needs proper method of collecting these animals. The procedures that need to be considered when collecting samples of macrofauna marine animals are sampling techniques, the type and size of the sampling tool , mesh size , and methods of preservation and fixation . In carrying out a study to determine the level of environmental disturbance aquatic ecosystems , in addition to disturbed areas , we need to use the control or reference areas for comparison . This area is ideally a region relatively undisturbed by human activity or environmental disturbance is assumed not to occur. Areas that are ecologically potentially disturbed areas can be cultivated fish / shrimp ponds in coastal systems , aquaculture floating net cage systems in a river or lake, disposal area (outlet) of industrial waste , etc. . While the reference area/control can be in the coastal mangrove areas , water areas without any human activities, and upstream river that are at least 1 km away from the disturbed area.
JURNAL SAINS DAN MATEMATIKA
2014-03-14 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/7912
JURNAL SAINS DAN MATEMATIKA; Volume 19 Issue 3 Year 2011
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8014
2015-09-19T16:54:06Z
sm:Art
"150108 2015 eng "
0854-0675
dc
Functionally Small Riemann Sums Fungsi Terintegral Henstock-Dunford pada [a,b]
Solikhin, Solikhin
Program Studi Matematika, FSM UNDIP
Jl. Prof. Soedarto, S.H. Semarang, 50275
Sumanto, Sumanto
Program Studi Matematika, FSM UNDIP
Jl. Prof. Soedarto, S.H. Semarang, 50275
Khabibah, Siti
Program Studi Matematika, FSM UNDIP
Jl. Prof. Soedarto, S.H. Semarang, 50275
In this paper we study Henstock-Dunford integral on [a,b]. We discuss some properties of the integrable. We shall define functionally small Riemann sums (FSRS) and show that it is necessary and sufficient condition for function to be Henstock-Dunford integral on [a,b].
Keywords: Henstock-Dunford integral, Functionally small Riemann sums
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
application/pdf
https://ejournal.undip.ac.id/index.php/sm/article/view/8014
JURNAL SAINS DAN MATEMATIKA; Volume 20 Issue 3 Year 2012
eng
Copyright (c)
oai:ojs.ejournal.undip.ac.id:article/8015
2015-09-30T15:58:09Z
sm:Art
"150108 2015 eng "
0854-0675
dc
Sistem Temu Kembali Informasi pada Dokumen Teks Menggunakan Metode Term Frequency Inverse Document Frequency (TF-IDF)
Harjanto, Dhony Syafe’i
Jurusan Matematika Fakultas Sains dan Matematika Universitas Diponegoro
Endah, Sukmawati Nur
Jurusan Ilmu Komputer / InformatikaFakultas Sains dan Matematika Universitas Diponegoro
Bahtiar, Nurdin
Informatics Department, Faculty of Sciences and Mathematics, Diponegoro University
Banyaknya informasi yang disimpan dalam dokumen teks mengakibatkan pengguna sistem informasi mengalami kesulitan untuk mendapatkan informasi yang diinginkan, maka diperlukan sebuah mesin pencarian yang dapat menentukan dan menemukan dokumen yang relavan sesuai dengan query pengguna. Penelitian ini menggunakan metode Term Frequency Inverse Document Frequency (TF-IDF) yang didasarkan pada kemunculan term pada tiap dokumen dan pengurangan dominasi term yang sering muncul di berbagai dokumen. Hasil Penelitian ini adalah program simulasi Sistem Temu Kembali Informasi pada dokumen teks menggunakan Metode Term Frequency Inverse Document Frequency (TF-IDF) yang menghasilkan perhitungan pembobotan Term Frequency Inverse Document Frequency (TF-IDF) dan mendapatkan dokumen relevan yang teranking sesuai tingkat pembobotannya berdasarkan query masukan oleh pengguna.
Keywords: Mesin Pencarian, Query, Term Frequency, TF-IDF
JURNAL SAINS DAN MATEMATIKA
2014-03-26 00:00:00
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https://ejournal.undip.ac.id/index.php/sm/article/view/8015
JURNAL SAINS DAN MATEMATIKA; Volume 20 Issue 3 Year 2012
eng
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