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INDONESIA
JURNAL ISTEK
Published by Universitas Islam Negeri Sunan Gunung Djati Bandung
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Core Subject : Science,
Computer Science & IT
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Articles 162 Documents
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EFEKTIVITAS SARI KEDELAI HITAM (Glycine soja sieb) SEBAGAI BAHAN PANGAN FUNGSIONAL Nunung Kurniasih; Tina Dewi Rosahdi; Nunik Rahmawati Rahman
JURNAL ISTEK Vol 7, No 1 (2013): ISTEK
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EFFECTIVENESS OF THE BLACK SOYBEAN EXTRACTS AS A FUNCTIONAL FOOD. Black soybean (Glycine soja sieb) has potential as functional food. This is because it have carbohydrates as a source of nutrition (prebiotic) for lactic acid bacteria (probiotic). This research was to determine the effectiveness of the black soybeans extracts as a medium for the growth of lactic acid bacteria, namely Lactobacillus lactis. Sampling is done on fermentation at the 0, 24, 48 and 72 for analysis of total acid, glucose levels and the number of bacteria. Analysis of the levels of lactic acid by qualitative and quantitative methods tertitrasi while total acid, glucose levels by methods Luff Schoorl and the number of bacteria using UV-Vis spectrophotometer. Fermentation extracts black soybeans by Lactobacillus lactis for 72 hours of earned value increased lactic acid levels. Reducing sugar content of both the substrate decreases. The number of bacteria Lactobacillus lactis increased to 72 hours. From the data obtained is known that black soybean extract is effective as a functional food.
TEKNIK IMOBILISASI ADSORPSI DAN ENTRAPMENT FILM NATA DE COCO-BENEDICT UNTUK DETEKSI KADAR GULA DALAM URIN Meyliana Wulandari
JURNAL ISTEK Vol 5, No 1-2 (2011): ISTEK
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Person with Diabetes Mellitus (DM) usually have high level of sugar in his blood. He also has trouble on glucose transportation in his kidneys, so his urine has high glucose concentration. It was synthesized of chemical sensor based on Benedict to measure glucose level. Cellulose from nata de coco is used as supporting material for Benedict immobilization. The characteristics of sensor are determined through sensor leaching, linear range, limit of detection, reproducibility, and sensitivity by reflectance spectrophotometry. The parameter which needs to be optimal at adsorption method is Benedict concentration and the time of dipping. While at entrapment method optimation is rasio of cellulose mass: Benedict volume and Benedict concentration. The optimal result of maximum wavelength of Benedict cellulose sensor with both methods is 541.57 nm. Optimum condition of dipping time is 40 minutes. Rasio of cellulose: with Benedict volume optimum at 1: 3, with optimal concentration of Benedict is 0.2682 M at adsorption method and 0.4470 M at entrapment method. The amounts of leaching at entrapment method is smaller than amounts at adsorption method. Sensor characteristics with adsorption method are better than with entrapment method. The result of glucose level measurement at urine which uses adsorption method and entrapment sensor has small differences with level of glucose data which uses Nelson-Somogyi standard method. So, adsorption is method of Benedict cellulose sensor which is more accurate for determining glucose level in urine.
MODEL REGRESI LINIER BERGANDA MENGGUNAKAN PENAKSIR PARAMETER REGRESI ROBUST M-ESTIMATOR (Studi Kasus: Produksi Padi di Provinsi Jawa Barat Tahun 2009) Rini Cahyandari; Nurul Hisani
JURNAL ISTEK Vol 6, No 1-2 (2012): ISTEK
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The least squares method is one method of parameter estimation in regression models. This method produces an unbiased estimator with consideration the assumptions are linearity, non-multicollinearity, non-autocorrelation, homoscedastic, and normally distributed error fulfilled. When the assumptions are not fulfilled, such as error distribution is not normal due to the existence of outliers, an estimation obtained are not exact.An alternative method that can overcome the problem of outliers is robust regression method using M-estimator (Iteratively Reweighted Least Squares). M-estimator is an iterative method using weighting function Huber and Tukey bisquare to estimate the parameters or coefficients in the regression model. The best model obtained by M-estimator robust method using Huber and Tukey bisquare is determined by the value R2adjusted and standard error values.
PENGARUH BERBAGAI NILAI EC (ELECTRICAL CONDUCTIVITY) TERHADAP PERTUMBUHAN DAN HASIL BAYAM (AMARANTHUS SP.) PADA HIDROPONIK SISTEM RAKIT APUNG (FLOATING HYDROPONICS SYSTEM) M. Subandi; Nella Purnama Salam; Budy Frasetya
JURNAL ISTEK Vol 9, No 2 (2015): ISTEK
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Availability of land is one of the factors that can distract in farming, mostly on the horticultural plants like spinach vegetable. Spinach vegetable contained vitamin and mineral that needed by human. Hydroponic systems are technically can be used as a means of cultivating with such limitations. Hydroponics system with floating raft is able to provide nutrient elements required by plants, because roots can absorb nutrient elements anytime and positions the sub merged direct root nutrient solution. The purpose of this study was to determine the influence of various EC value (Electrical Conductivity) of the optimal fertilizer AB Mix towards growth of spinach (Amaranthus sp.). This research is held at Ciparanje, Jatinangor, Sumedang on May till June 2014. This research uses the random arrangement of a non-factorial group which have the values of EC (e1 = 1,5 mS cm-1 ; e2 = 1,8 mS cm-1 ; e3 = 2,1 mS cm-1 ; e4 = 2,4 mS cm-1 ; e5 = 2,7 mS cm-1 ; and e6 = 3,0 mS cm-1) with 4 replicates. Research results showed the level of e6 is capable of giving the best results against the height parameter, the vast index plant leaves, fresh weight, and dry weight. While on root length parameter, harvest index, and the shoot root ratio root does not significant different results for real. This is caused by nutrient solution pH which was not inaccordance with the needs of the crop of spinach with hydroponic systems. Hydroponic system on the recommended nutrient solution pH 5-6, nutrient solution pH while in the land ranged from 6-10. It became a bench mark growth of plants that were not optimal. Keywords : EC (Electrical Conductivity), Floating Hydroponics System, Spinach
ANALISIS VEGETASI POHON HUTAN ALAM GUNUNG MANGLAYANG KABUPATEN BANDUNG Tri Cahyanto; Destiana Chairunnisa; Tony Sudjarwo
JURNAL ISTEK Vol 8, No 2 (2014): ISTEK
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Forest is one of the natural resources on which there is vegetation community dominated by trees and has a very close relationship with the natural world. The purpose of this examination was to examine the composition and structure of natural forest vegetation, including species, stratification and patterns of distribution of natural forest vegetation of Mount Manglayang. In addition to known picture of the distribution of species populations and the influence of environmental factors. The examination was conducted using the method of least squares with purposive sampling, which is done by determining the plot is based on the height above sea level (asl) by 4 plot. Then each plot measuring 10 × 10 m 2 (≥ 10 cm diameter) and subplot size of 5 × 5 m2 (2 ─ rod diameter 9.9 cm). The data obtained for the calculation of the density analysis (K) and relative density (KR), frequency (F) and relative frequency (FR), dominance (D) and relative dominance (DR) and Important Value Index (IVI), in addition to the also calculated species diversity and uniformity. The results indicate there are 11 types of saplings and trees were found. Vegetation sapling that has a value (IVI) a maximum of 70.11% is kind Pinanga coronata. Amounted to 56.21% while the tree is Ficus procera. To dominate the diameter distribution diameter about 2 ─ 60 cm. While the height of the trees that dominate the distribution is in stratum C (4 ─ 20 m). Distribution patterns and tree saplings are regular. Calculation of diversity indices for saplings obtained a value of 1.64 (medium category) and uniformity index value of 0.48 obtained (lower category) and for tree diversity index obtained values of 2.00 (medium category) and obtained a value of the uniformity index 0.53 (lower category).
PENGARUH EKSTRAK DAUN SIRIH (Pipper Betle.L) SEBAGAI PERENDAM TELUR AYAM RAS KONSUMSI TERHADAP DAYA AWET PADA PENYIMPANAN SUHU RUANG Eka Wulandari; Obin Rachmawan; Ahmad Tafik Taofik; Nono Suwarno; Ahmad Faisal
JURNAL ISTEK Vol 7, No 2 (2013): ISTEK
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This research was conducted in Laboratory of Processing Livestock Product Technology at Faculty of Animal Husbandry, Padjadjaran University, Sumedang from July 31thto September 3th, 2010. The aim of this research was to find out the level of concentration of betle leaf extract as an hen’s egg soaker produce thes longest shelf life terms of haugh unit value, albumen index, and yolk index. This research used an experimental method with a Clompetely Randomized Design. There were five kinds treatments concentration level of betle leaf extract (P1=0%, P2=15%, P3=30%, P4=45%, P5=60%) with four replications. Duncan multiple range test were held to find the difference between any treatment in this research. The result of the research shows the use of betle leaf with the concentration level of 60% produce the longest shelf life 34 days in term haugh unit value, 32,75 days in terms of albumen index value and 34 days in term of yolk index value.
KEMAMPUAN BELAJAR BERNYANYI PADA BURUNG KENARI JANTAN MUDA (Serinus canaria Linn.) YANG DIDEDAHKAN SECARA LIVE-TUTORING DAN TAPE-TUTORING Ucu Julita; Lulu Lusianti Fitri; Yayu Tsamrotul Fuadah
JURNAL ISTEK Vol 9, No 1 (2015): ISTEK
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Burung kenari merupakan burung bernyanyi yang banyak digemari oleh masyarakat di Indonesia. Memiliki variasi warna yang beragam dan kombinasi warna yang unik. Lingkungan sosial merupakan faktor penting dalam proses belajar bernyanyi, beberapa spesies termasuk burung kenari (Serinus canaria Linn.) mampu belajar lebih baik dengan metode pembelajaran secara live-tutoring dari pada secara tape-tutoring. Penelitian ini bertujuan untuk mengetahui pengaruh pendedahan suara burung kenari jantan dewasa secara tape-tutoring dan live-tutoring terhadap emisi nyanyian burung kenari jantan muda. Penelitian ini dilakukan selama empat bulan (Februari-Mei 2011). Enam ekor burung kenari jantan muda dan dua burung tutor dibagi kedalam dua kelompok perlakuan proses belajar yaitu kelompok tape-tutoring dan kelompok live-tutoring. Perlakuan pendedahan suara dilakukan setiap pagi dari pukul 10.00-14.00 WIB selama 16 minggu. Hasil analisis suara diuji dengan menggunakan uji t. Penilaian kualitas nyanyian burung kenari muda dilakukan dengan metode pendedahan dan pencuplikan suara serta dianalisis dengan program komputer Avisoft-Sonagraph Pro’. Pencuplikan suara dilakukan hingga diperoleh 50 cuplikan nyanyian setiap bulan selama empat bulan perlakuan dari setiap individu burung. Parameter suara nyanyian yang diukur meliputi: durasi nyanyian, song repertoire, syllable repertoire, repertoire size, dan jumlah tipe silabel dalam satu nyanyian. Berdasarkan hasil analisis diketahui bahwa burung kenari jantan muda yang didedahkan secara ‘live-tutoring’ dalam proses pembelajarannya mampu menghasilkan kualitas nyanyian yang paling baik dan berbeda nyata (P
POLA DIVERSIFIKASI KONSUMSI PANGAN MASYARAKAT ADAT KAMPUNG CIREUNDEU KOTA CIMAHI JAWA BARAT Kelik Putranto; Ahmad Taofik
JURNAL ISTEK Vol 8, No 1 (2014): ISTEK
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Penelitian ini bertujuan untuk menganalisis produksi singkong dan produksi rasi sebagai makanan pokok, menganalisis pola diversifikasi konsumsi pangan keluarga, menganalisis tingkat konsumsi energi dan tingkat konsumsi protein serta mencari kemungkinan pengaruh faktor sosial ekonomi dan budaya terhadap tingkat konsumsi energi dan tingkat konsumsi protein keluarga di kampung Cireundeu. Penelitian telah dilakukan pada keluarga dengan makanan pokok rasi (beras singkong) di masyarakat adat kampung Cireundeu Desa Leuwigajah Kecamatan Cimahi Selatan Kota Cimahi Propinsi Jawa Barat. Metode pengumpulan data dilakukan melalui observasi dan wawancara langsung dengan 40 keluarga. Metode penelitian yang digunakan adalah metode survey explanatori, sedangkan metode analisis yang digunakan adalah analisis jalur, dengan faktor-faktor sosial ekonomi dan budaya yang diduga berpengaruh terhadap tingkat konsumsi energi dan tingkat konsumsi protein adalah pendapatan, pengeluaran pangan, besar keluarga, pendidikan ibu, umur ibu dan pengetahuan gizi ibu. Hasil penelitian menunjukkan bahwa produksi singkong di Kampung Cireundeu pada tahun 2011 mengalami penurunan yang tajam yaitu sebesar 3 ton per hektar bila dibandingkan dengan produksi tahun 2006 sebesar 10 ton per hektar. Penurunan ini diakibatkan oleh hama kumbang uret atau “kuuk” (Exopholishipoleuca). Produksi rasi sebagai makanan pokok tahun 2011 masih mencukupi yaitu 13,5 ton, sedangkan total kebutuhan konsumsi pada tahun 2011 sebesar 7,2 ton. Jenis pangan yang dominan dikonsumsi oleh keluarga terdiri dari makanan pokok rasi, tempe, tahu, ikan asin dan sayuran. Masyarakat adat Cireundeu masih memiliki motivasi yang tinggi untuk tetap mengkonsumsi rasi sebagai makanan pokok dengan kebiasaan makan tiga kali sehari pada waktu pagi, siang dan sore. Tingkat konsumsi gizi masyarakat adat Cireunde dengan pangan pokok rasi dalam kategori baik, penetapan ini berdasarkan tingkat konsumsi energi 89,5% dan tingkat konsumsi protein 112,3%. Faktor dominan yang mempunyai pengaruh nyata terhadap tingkat konsumsi energi adalah pengetahuan gizi ibu. Sedangkan faktor pendidikan ibu dan pengetahuan gizi ibu secara bersama-sama berpengaruh nyata terhadap tingkat konsumsi protein.
DESAIN DAN SIMULASI NUMERIK SINKRONISASI UNIDIRECTIONAL SIRKUIT JERK DAN APLIKASINYA UNTUK SISTEM KEAMANAN KOMUNIKASI Mada Sanjaya W.S; Aceng Sambas; Mustafa Mamat
JURNAL ISTEK Vol 7, No 2 (2013): ISTEK
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Sistem chaos mempunyai karakteristik ketergantungan yang sensitif pada kondisi awal, mirip dengan perilaku acak, dan memiliki strange attractor yang unik. Chaos mempunyai potensi yang baik untuk dijadikan sistem keamanan komunikasi. Dalam makalah ini, kami menunjukkan beberapa fenomena yang menarik dari tiga orde sirkuit Jerk dengan modulus non-linier. Perilaku chaos ini berfungsi sebagai variabel parameter kontrol. Penelitian awal dalam makalah ini adalah menganalisis diagram fase, diagram bifurkasi dan peta Poincare. Analisis sinkronisasi dalam kasus sinkronisasi unidirectional antara dua sistem chaos yang identik juga telah disajikan. Berdasarkan hasil sinkronisasi chaos tersebut, akhirnya efektivitas skema sinkronisasi unidirectional antara dua sistem Jerk yang identik dalam sistem keamanan komunikasi disajikan secara rinci dan menunjukkan potensi untuk dijadikan sebagai masking data. Integrasi fisika teoritis, simulasi numerik dengan menggunakan MATLAB serta implementasi simulasi sirkuit dengan menggunakan MultiSIM telah dilakukan dalam makalah ini.
APLIKASI ANALISIS KORESPONDENSI UNTUK MELIHAT PERKEMBANGAN PEMBANGUNAN WILAYAH DI KABUPATEN SUMEDANG Sudartianto Sudartianto Sudartianto
JURNAL ISTEK Vol 5, No 1-2 (2011): ISTEK
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In this paper reviewed the development progress in the district through the analysis corespondence Sumedang. Development indicators used consisted of large educational facilities, large trading companies and peson income families per day. Based on the analysis results obtained corespondence conclusion that the sub-districts that have passed provincial roads educational facilities compared to most sub-districts that are not provincial roads impassable.

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