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INDONESIA
SAINS DAN MATEMATIKA
Published by Universitas Diponegoro
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Articles 169 Documents
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PREDIKSI BATAS CEKUNGAN JAWA TIMUR UTARA DENGAN PEGUNUNGAN SELATAN DI DAERAH MAGETAN - PLAOSAN DENGAN METODE GRAVITASI Wijayanti, Dewi; Yulianto, Rr. Tony; Nurwidyanto, M. Irtem
JURNAL SAINS DAN MATEMATIKA Volume 17 Issue 1 Year 2009
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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
Whey Tahu sebagai Penghasil Biolektrisitas pada Sistem Microbial Fuel Cell dengan Lactobacillus Plantarum Ismawati, Nur; Aminin, Agustina L. N.; Suyati, Linda
JURNAL SAINS DAN MATEMATIKA Volume 23 Issue 2 Year 2015
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Abstract

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.
Penentuan Komposisi Asam Lemak Ekstrak Minyak Ikan Kembung (Rastrelliger kanagurta) dengan GC-MS dan Uji Toksisitasnya Menggunakan Metode BSLT Wibawa, Pratama Jujur; Listiorini, Dwi; Fachriyah, Enny
JURNAL SAINS DAN MATEMATIKA Volume 14 issue 4 Year 2006
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Abstract

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
Deposisi Nanopartikel Titanium Dioksida (Tio2) di atas Gelas Transparan Konduktif dan Aplikasinya sebagai Elektroda Kerja pada Sel Surya Berbasis Dye (DSSC) Wahyudi, Bayu; Widiyandari, Hendri
JURNAL SAINS DAN MATEMATIKA Volume 19 Issue 4 Year 2011
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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
Produksi Ion Nitrogen dalam Reaktor Plasma Lucutan Pijar Korona Konfigurasi Multi Titik Bidang dan Pemanfaatan untuk Pengayaan Nitrogen pada Pupuk Kompos Nur, Muhammad; Nugroho, Irfan Wahyu; Muchlisin, Zaenul; LatifNitrogen ions have been generated in the air by corona glow discharge plasma. The, Sjafrul
JURNAL SAINS DAN MATEMATIKA Volume 19 Issue 2 Year 2011
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Abstract

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
Natural Polarization and Electrooptics Comparison for Evaluation of Cooking Oil Total Quality Sugito, Heri; Firdausi, Ketut Sofjan
JURNAL SAINS DAN MATEMATIKA Volume 22 Issue 4 Year 2014
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Abstract

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.
PENGARUH FORMALIN, DIAZEPAM DAN MINUMAN BERALKOHOL TERHADAP KONSUMSI PAKAN, MINUM DAN BOBOT TUBUH Mus musculus Saraswati, Tyas Rini; Indraswari, Endah; Nurani, Nurani
JURNAL SAINS DAN MATEMATIKA Volume 17 Issue 3 Year 2009
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Abstract

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
Diatom Epipelik sebagai Bioindikator Kualitas Perairan Danau Rawa Pening Soeprobowati, Tri Retnaningsih; Hidayat, Jafron Wasiq; Baskoro, Karyadi
JURNAL SAINS DAN MATEMATIKA Volume 19 Issue 4 Year 2011
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Abstract

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
Pembuatan dan Karakterisasi Komposit CNT/PVA Setyaningsih, Metri; Widiyandari, Hendri; Subagio, Agus
JURNAL SAINS DAN MATEMATIKA Volume 21 Issue 3 Year 2013
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Abstract

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%.
MEMBANGUN KODE GOLAY (24, 12, 8) DENGAN MATRTKS GENERATOR DAN MENGGUNAKAN KRITERIA PERMUTASI Irawanto, Bambang; Rizki K., Ikhsan
JURNAL SAINS DAN MATEMATIKA Volume 17 Issue 2 Year 2009
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Abstract

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 irwolvetwo  product codes.  This methodform the generator  matrixframework of the (24, 12, 8) Golay code  that isbasedontheso-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 CLWith  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.

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