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JURNAL ISTEK
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Articles 162 Documents
RESPONS BERBAGAI JENIS TANAMAN PADI (Oryza sativa L.) TERHADAP METODE SRI (System of Rice Intensification) DI LAHAN DARAT Suryaman Birnadi
JURNAL ISTEK Vol 7, No 2 (2013): ISTEK
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An experiment was conducted to study growth and yield two cultivars of rice with organic fertilizer bokashi and farmyard manure on SRI (System of Rice Intensification). Result showed there are no interaction effect between the application of organic fertilizer and cultivars. Although there is significant effect an main effect of growth and yield. Soil+bokashi proveed to be the highest effect on plant height, or number vegetative, dry plant weight, weight of dry harvest grain rice NPK absorption, and the mean growth rate. Soil+ farmyard manure proved to be the highest effect an weight of dry harvest grain rice. Cv. Ciherang proveed to be the highest effect on plant height, on number vegetative, dry plant weight, and the mean growth rate.
REVITALISASI TASAWUF DI MASA MODERN Gina Giftia Azmiana; Abdul Kadir; Yuningsih Yuningsih
JURNAL ISTEK Vol 6, No 1-2 (2012): ISTEK
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The reality view of some Moslems today in regard to Sufism is conservative, old-fashioned or even something which is not comes from Islam. On the other hand, modern life which is characterized with materialism, rationalism, and hedonism not only brings positive value to development of science and technology but also negative effects to human being. Human life becomes empty and detached from spirituals values. Eventually, acts of worship (Ibadah) that Moslems perform merely just a ritual that does not impact positively to personal piety or society. Therefore, revitalization of Sufism is aimed to reinstate the importance of Sufism for Moslems life with understanding the nature of Sufism itself. The essence of Sufism is to present Allah in every aspects of life. Commencing with learn to love, then improving the quality of life by loving something which is the most entitled to be loved, which is Allah. At the same time the interpretation of Zuhud is going through by putting into effect on daily life as a way to get the best place in the Hereafter as well as Allah's approval.
PENGEMBANGAN LAPISAN TIPIS TEMBAGA OKSIDA SEBAGAI BEAM DIVIDER PADA PERANGKAT PRAKTIKUM FISIKA (OPTIKA) DI MADRASAH/SEKOLAH Bebeh Wahid Nuryadin
JURNAL ISTEK Vol 9, No 2 (2015): ISTEK
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Beam divider (alat optik) adalah salah satu perangkat yang umum digunakan dalam pecobaan optika, misalkan interferometer Michelson-Morley. Beam divider berfungsi dalam membagi satu sinar laser menjadi dua sinar koheren, masing-masing sebesar 50% untuk refleksi dan transmisinya. Secara umum beam divider terbuat dari lapisan tipis logam pada permukaan kaca sehingga memiliki nilai reflektansi dan transmitansi yang baik dan dapat diatur. Penelitian ini ditujukan untuk mensintesis dan mengembangkan beam divider berbasis lapisan tipis tembaga oksida. Lapisan tipis tembaga disintesis menggunakan metoda spray pyrolysis pada beberapa variasi parameter seperti suhu, jarak spray terhadap substrat, konsentrasi larutan tembaga dan waktu sintesis. Parameter tersebut berpengaruh terhadap ketebalan lapisan dan nilai rasio transmisi dan refleksinya. Keberhasilan pembuatan lapisan tipis oksida tembaga ditandai dengan terbentuknya lapisan tipis berwarna kecoklatan yang tembus cahaya pada substrat kaca. Lapisan tipis tembaga oksida akan digunakan sebagai beam divider pada percobaan fisika (optika) di madrasah/sekolah, seperti percobaan interferometer Michelson-Morley.
PENINGKATAN NUTRISI LIMBAH PRODUKSI BIOETANOL DARI SINGKONG MELALUI FERMENTASI OLEH KONSORSIUM Saccharomyces cereviseae dan Trichoderma viride Rahmat Taufiq Mustahiq Akbar; Yani Suryani; Iman Hernaman
JURNAL ISTEK Vol 8, No 2 (2014): ISTEK
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Bioethanol is a renewable bio-fuels as an alternative energy substitute for oil, in the process leaving a solid waste that can be leveraged into a more useful product. This study aims to improve nutrition and reduce HCN and get the right dose of inoculum in the fermentation of bioethanol from cassava waste. This research was conducted with the experimental method used Completely Randomized Design (CRD) in the 3 x 3 factorial with 3 replications. The first factor inoculum dose (D) to the level of inoculum dose, respectively d1 = 2%, 3% = d2, d3 = 4% and the second factor is the length of fermentation, namely for 0, 4 and 8 days As for some of the parameters measured were protein content and crude fiber through proximate analysis, as well as levels of HCN by distillation method. The result showed that the best dose is the dose of 4% which can increase protein content from 2.47% to 2.91% before fermentation - 4.88% after fermentation and can lower crude fiber content of 2.65% to 2.50 % - 2.07% and influential to the decreased levels of HCN from 15.92 mg / kg to 12.73 mg / kg - 0.00 mg / kg for 8 days after fermentation. The results showed that the fermentation process using a consortium of Saccharomyces cerevisiae and Trichoderma viride can improve the quality of solid waste processing bioethanol from cassava which include increased levels of protein, crude fiber and decreased levels of HCN reduction.
STUDI POPULASI DAN DISTRIBUSI KUKANG JAWA (Nycticebus javanicus, E. Geoffroy, 1812) DI TALUN DESA SINDULANG KECAMATAN CIMANGGUNG SUMEDANG JAWA BARAT Ana Widiana; Samsul Sulaeman; Ida Kinasih
JURNAL ISTEK Vol 7, No 1 (2013): ISTEK
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Kukang jawa (Nycticebus javanicus) adalah primata yang termasuk famili Lorisidae. Saat ini kukang dikategorikan sebagai satwa langka dan terancam punah. Beberapa faktor yang menyebabkan penurunan populasi dan distribusi kukang jawa yaitu adanya penebangan pohon atau penyeragaman tanaman. Talun merupakan salah satu tempat yang dijadikan kukang jawa sebagai habitat hidupnya. Lokasi yang memiliki kawasan talun yang cukup luas yaitu Desa Sindula Kecamatan Cimanggung Sumedang Jawa Barat. Tujuan penelitian ini adalah untuk mengetahui populasi dan distribusi kukang jawa yang terdapat di Talun Desa Sindula Kecamatan Cimanggung Sumedang Pengumpulan data distribusi dilakukan dengan memetakan koordinat lokasi-lokasi ditemukannya kukang jawa. Densitas dan kepadatan populasi kukang jawa dihitung dari total individu dibagi dengan luas lokasi penelitian. Luas daerah yang dihitung adalah luas perkiraan area yang dijadikan lokasi penelitian yang diduga terdapat kukang jawa. Hasil dari penelitian yang telah dilaksanakan terdapat 21 individu kukang jawa di Desa Sindulang yang tersebar di blok Jamuaer dan blok Leuwiliang, sedangkan pada blok Cigumentong, blok Ciseupan,dan blok Sindulang tidak ditemukan kukang jawa. Kepadatan populasi kukang jawa di Talun Desa Sindulang adalah 0.41 individu/ha.
MENINJAU BUKTI ILMIAH KEKUATAN BESI MENURUT CARA PANDANG ILMU KIMIA DAN SAINS YANG BERKAITAN BESERTA BEBERAPA KONSEKUENSINYA SEBAGAIMANA DISEBUT DALAM AL QURAN QS. AL HADIID:25 Dede Suhendar
JURNAL ISTEK Vol 5, No 1-2 (2011): ISTEK
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Kauniyah verses of iron in the Qur'an Surah Al Hadiid, Verse 25, in particular, has not been widely studied in the perspective of chemistry, let the problems associated with its implementation according to what is listed in the verse. In this paper, we discussed about of “great strength of iron” in the verse from the viewpoint of modern chemistry supported with findings of iron in other scientific disciplines are closely related with, as in Geology, Physics, Biology and Materials Science. In this paper, we also discussed the meaning of the next sentence of the verse "...and that Allah may know who is helping (religion) Him and His apostles but God has not seen." The discussion is limited to a review of the nuclear chemistry (nuclides), chemical structure, magnetic, and chemical bonding properties. We can be concluded that the iron does have remarkable properties leading to iron predicate as stated in the verse. The facts of iron are following: (1) Iron is an element with isotopes that have the most stable nucleus of all the existing elements; (2) Iron has metal structure (polymorph) that adaptive to the presence of other metal/s or elements in its structure, so it can be made many variations of steel/alloy; (3) Iron has the strongest magnetic effect on life on earth; and (4) The nature of the bonds formed between the iron with organic compounds of iron proved a major role in biochemical processes. Finally, the great strength of the iron phenomenon has consequences as a reflection of Muslims in order to use it in various forms that lead to the establishment of Islamic symbols.
APPLICATION DESIGN FOR LEARNING ARABIC FOR ELEMENTARY SCHOOL BASED ON MULTIMEDIA Wisnu Uriawan; Adam Faroqi
JURNAL ISTEK Vol 6, No 1-2 (2012): ISTEK
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Computer and multimedia technology is currently the center of attention, especially in gaming applications (games) with features a realistic 2D and 3D, making it very popular with the kids, especially elementary school level and equal. This happens in teaching and learning in schools, these students are only given during the learning materials through the teachers without going through an interesting instructional media such as multimedia application. Currently there are many students who have difficulty in understanding the subject matter, one of which the Arabic language lessons. Complexity of the material provided by the teacher to the students through a book is still sometimes difficult to understand, especially by students who have background can not read the Al-Quran.Learning Arabic in principle easier when accompanied with supporting media such as the application of learning the Arabic language, so students have the motivation, because the learning system is not monotone so as not to cause saturation and also help a teachers in delivering the material.Design of the application of learning the Arabic language can be used to assist students in learning the Arabic language with a written description, drawings and two language understanding (Arabic and Indonesia). Applications have been tailored to the needs for learning, and performed testing using black box method. The test results stated that all needs can be met entirely defined. Concept used in learning the Arabic language is a multimedia-based.
PENGARUH PENGOLAHAN TANAH DAN PUPUK ORGANIK BOKASHI TERHADAP PERTUMBUHAN DAN HASIL TANAMAN KEDELAI (Glycine max L.) KULTIVAR WILIS Suryaman Birnadi Birnadi
JURNAL ISTEK Vol 8, No 1 (2014): ISTEK
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An experiment was conducted to study growth and yield of soybean with bokashi at various dosages and frequency soil tillage. Result showed there are interaction effect between the application of Bokashi and frequency soil tillage to dry plant weight soybean on optimum combination b2 p2 (bokashi 10 t ha-1 and twice soil tillage). Bokashi dosage level b2 (10 t ha-1) effect to the plant height and wilt of dry grain. Bokashi dosage level b3 (15 t ha-1) effect to effective nodule, leaf area, and yield of dry grain. Frequency level at once soil tillage (p1) effect to the plant height, effective nodule, and leaf area.
Penggunaan Limbah Cair Tahu untuk Meningkatkan Pertumbuhan dan Produksi Biodisel dari Mikroalga Scenedesmus sp Mohamad Agus Salim
JURNAL ISTEK Vol 7, No 1 (2013): ISTEK
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Penelitian yang dilaksanakan bertujuan untuk mengetahui pengaruh pemberian limbah cair tahu terhadap kerapatan sel dan produksi biodisel dari mikroalga Scenedesmus sp. Percobaan menggunakan rancangan acak lengkap (RAL) dengan sepuluh ulangan. Perlakuan terdiri dari enam konsentrasi limbah cair tahu yaitu 0% (kontrol), 10%, 20%, 30%, 40% dan 50%. Pada puncak populasi, kerapatan sel tertinggi pada perlakuan limbah cair tahu 20% sebanyak 8.996.125 sel.ml-1 pada hari ketujuh dan kerapatan sel terendah terjadi pada pemberian limbah cair tahu 50% sebanyak 225.367 sel.ml-1 pada hari ke tigabelas. Berat basah, berat kering dan hasil minyak tertinggi terjadi pada pemberian limbah cair tahu 20% dan terendah pada pemberian limbah cair tahu 50%. Produksi biodisel tertinggi terjadi pada pemberian limbah cair tahu 20% sebanyak 32.33%-berat.
PENGARUH DOSIS INOKULUM DAN WAKTU FERMENTASI OLEH RHIZOPUS ORYZAE TERHADAP PENINGKATAN NILAI GIZI BUNGKIL BIJI JATROPHA CURCAS L. Tuti Kurniati
JURNAL ISTEK Vol 5, No 1-2 (2011): ISTEK
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The Jatropha curcas oil extraction process potentially produce 1 (one) ton/ha of seed cake of 5 ton of Jatropha curcas fruit process into 2 ton/ha of Jatropha curcas oil. This solid organic waste has high potency as broiler feeding. However, the problem is the nutrition value of jatropha seed cake, because the seed cake contains too high raw fat and raw protein that can not be digested directly. Fermentation is one of the method to improve the nutrition value of seed cake. In this research, Rhizopus oryzae was used as fermentation agent of jathropa seed cake. This research is aimed to obtain the optimal inoculum dosage and fermentation duration to improve nutrition value of Jatropha curcas seed cake. The experiment used random factorial method with three times repetition. The factor for the first treatment is fermentation duration, 72 hours, 96 hours and 120 hours. The factor for the second treatment was inoculum dosage, that comprised three degree, 2 g/kg, 3 g/kg, and 4 g/kg. Measured parameter were proximate analysis of raw protein and fat content of fermentation product. The research’s result shows the change of nutrient content in Jatropha curcas seed cake after fermentation. The results showed that highest increase of raw protein (7,97%) was achieved by 3g/kg inoculum dosage and 120 hours fermentation duration. The highest decrease in raw fat (82,46,%) achieved by 4g/kg inoculum dosage and 96 hours fermentation duration. From its effectivity, it is obtained that the optimal inoculum dosage is 3 g/kg with optimal fermentation duration which is 120 hours that yield the best nutrient quality in Jatropha curcas seed cake fermentation.

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