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INDONESIA
JURNAL SAINS DAN TEKNOLOGI INDONESIA
Published by Badan Pengkajian dan Penerapan Teknologi
ISSN : -     EISSN : -     DOI : -
Core Subject : Science, Education,
Computer Science & IT Education
Arjuna Subject : -
Articles 236 Documents
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PENGKAJIAN BEBERAPA ALGORITMA UNTUK MENGEVALUASI DAN MENGHITUNG LOSSES ENERGI PADA SISTEM DISTRIBUSI TENAGA LISTRIK hilal, hamzah
Jurnal Sains dan Teknologi Indonesia Vol. 14 No. 2 (2012)
Publisher : Badan Pengkajian dan Penerapan Teknologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (216.329 KB) | DOI: 10.29122/jsti.v14i2.916

Abstract

This paper presents an assessment of some algorithms to evaluate and costing energy losses in electrical power distribution systems. The algorithms had considered the accuracy and computational speed as variables. A simplified feeder serving large residensial and industrial loads is used to test the algoritms, and the results for each algorithm are compared.
KAJIAN PENAMBANGAN BIJIH BESI DI SUNGAI RIAM, PEMALONGAN DAN SUMBER MULIA KECAMATAN PELAIHARI KABUPATEN TANAH LAUT KALIMANTAN SELATAN Tresnadi, Hidir
Jurnal Sains dan Teknologi Indonesia Vol. 11 No. 2 (2009)
Publisher : Badan Pengkajian dan Penerapan Teknologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (58.197 KB) | DOI: 10.29122/jsti.v11i2.820

Abstract

The need of iron ore as material for steel industry in 2006 increased, so the are many iron ore mine activity in Kabupaten Tanah Laut, South Kalimantan. There are 25 cooperation contract between Pememerintah Daerah owned Company, PT Baratala Tuntung Pandang, as owner of contract of work for Iron Ore Mine, five companies have contracts of Mining Work and three companies have contracts of expolration work. The iron ore production increased from 115,658.484 MT in 2006 to 445,286 MT. The objectives of study is to delineate the iron mine activities in Kabupaten Tanah Laut, Kalimantan Selatan Province. The small scale mine of Iron ore involved the local people and semi mechanic equipment such back hoe, Bull Dozer, shovel and rock breaker for breake the source rock. Meanwhile there some grizllies to seperate the iron ore based on the size. The size of iron ore are lump ore to fine ore to stockpile. The survey iron ore mine are in Pemalongan, Sumber Mulia (three cooperationcontract) and Sungai Riam (three cooperation contract). The production iron ore of local mine people in the three mine ore location are prized from Rp. 4000,- per pack to Rp. 8000,- per pack. The iron ore quality of a pack id about 40 Kg to 50 Kg, and the quality based on the visual only. The Mine Iron environment quality management should be increased to keep the environment quality under control for the easier reclamation in the closure mine in post mine time.
Aplikasi Kontrol Digital Untuk Pemupukan Secara Variable Rate Pada Sistem Pertanian Presisi Manalu, Lamhot P.
Jurnal Sains dan Teknologi Indonesia Vol. 15 No. 3 (2013)
Publisher : Badan Pengkajian dan Penerapan Teknologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (479.032 KB) | DOI: 10.29122/jsti.v15i3.3394

Abstract

Precision agriculture has many facets including guidance, yield mapping, variable rate application and remote sensing. Variable rate nitrogen fertilization is a technique being developed for fertilizer application in recent years. One of the main problems in variable rate nitrogen fertilization is controlling the fertilizer application rate according to the soil nitrate level. In this paper, a digital control system for variable rate nitrogen fertilization is presented. A pole-placement controller design based on the simplified process model is used in this system. The system dynamic response of the pole-placement controller was simulated under the condition with torque disturbance and the condition without torque disturbance. The digital controller was then implemented into a prototype system and the dynamic response of the control system was tested under different torque disturbance conditions. The control system performed at acceptable levels under small external torque disturbance conditions. However, under large torque disturbances, the steady-state offset error in the system response was not acceptable and the use of a robust controller for both tracking control and disturbance rejection was recommended. This paper presents a simulation of the use of digital control for variable rate fertilization The benefits of using variable rate technology are very clear. Low yielding areas of the field are no longer over fertilized resulting in reduction of costs in those areas.Pertanian presisi memiliki banyak aspek diantaranya pengukuran, pemetaan hasil, aplikasi laju tidak tetap dan penginderaan jarak jauh. Pemupukan nitrogen secara laju tidak tetap (variable rate) adalah teknik yang dikembangkan untuk aplikasi pemupukan dalam beberapa tahun terakhir. Salah satu masalah utama dalam pemupukan nitrogen secara laju tidak tetap yaitu mengontrol jumlah pemakaian pupuk agar sesuai dengan kandungan nitrat tanah. Tulisan ini menyajikan studi tentang aplikasi sistem kontrol digital untuk pemupukan nitrogen secara laju tidak tetap dalam kerangka pertanian presisi (precision farming). Sebuah desain kontroler tiang-penempatan didasarkan penyederhanaan modelnya digunakan dalam sistem ini. Sistem respon dinamik dari pengontrol tiang-penempatan disimulasikan pada kondisi dengan gangguan torsi dan kondisi tanpa gangguan torsi. Kontrol digital kemudian diimplementasikan ke dalam sistem prototipe dan respon dinamik dari sistem kontrol diuji di bawah kondisi gangguan torsi yang berbeda. Sistem kontrol dilakukan pada tingkat yang dapat diterima dalam kondisi gangguan torsi eksternal yang kecil. Namun, di bawah gangguan torsi besar, kondisi steady yang mengimbangi kesalahan dalam respon sistem tidak dapat diterima. Tulisan ini menyajikan simulasi penggunaan kontrol digital untuk pemupukan secara variable rate. Tujuan penggunaan teknologi variable rate adalah agar lokasi dengan produktivitas rendah tidak lagi dipupuk secara berlebihan sehingga mengurangi biaya.Keywords: fertilization, digital control, variable rate, precision farming.
Keterkaitan Desa Kota : Sebuah Alternatif Pembangunan di Wilayah Pedesaan -, Maryadi
Jurnal Sains dan Teknologi Indonesia Vol. 17 No. 2 (2015)
Publisher : Badan Pengkajian dan Penerapan Teknologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (287.898 KB) | DOI: 10.29122/jsti.v17i2.3428

Abstract

This article explained the development in rural area as a result of relationships between rural and urban regions. In Indonesia the realtionships particularly influenced by agricultural activities in rural areas. As we know majority of rural people in Indonesia are still work in agricultural sector meanwhile production factors provided by urban people. It is also widely recognized that there exists an economic, social and environmental interdependence between urban and rural areas and a need for balanced and mutually supportive approach to development of the two areas. The discrete consideration of rural development as completely distinct from urban development is no longer valid. A new perspective, referred to as the rural-urban linkage development approach, is increasingly becoming the accepted approach. Rural-urban linkage generally refers to the growing flow of public and private capital, people (migration and commuting) and goods (trade) between urban and rural areas.Tulisan ini mencoba untuk menjelaskan pembanguan wilayah pedesaan sebagai akibat adanya hubungan antara wilayah pedesaan dengan perkotaan. Di Indonesia hubungan itu lebih disebabkan oleh adanya kegiatan di bidang pertanian mengingat sebagian besar penduduk pedesaan masih bekerja di sektor pertanian, sementara faktor produksi yang diperlukan berada di wilayah perkotaan. Seperti diketahui pada saat ini terdapat saling ketergantungan ekonomi, sosial dan lingkungan antara daerah perkotaan dan pedesaan. Oleh karena itu diperlukan adanya pendekatan yang seimbang dan saling mendukung untuk pembangunan kedua daerah itu. Pemikiran bahwa pembangunan pedesaan berbeda dari pembangunan perkotaan sudah tidak berlalu lagi. Perspektif baru menyebutkan pembangunan pedesaan akan lebih cepat bila hubungan antara perdesaan-perkotaan semakin erat. Hal ini berkaitan dengan fakta ekonomi yang berkembang dalam bentuk pergerakan barang, orang serta modal yang terjadi antara daerah perkotaan dan perdesaan.Keywords: Inequality, development, village, town
PENGARUH PENANGANAN PASCA PANEN TERHADAP MUTU KOMODITAS HORTIKULTURA Samad, M Yusuf
Jurnal Sains dan Teknologi Indonesia Vol. 8 No. 1 (2006)
Publisher : Badan Pengkajian dan Penerapan Teknologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (61.875 KB) | DOI: 10.29122/jsti.v8i1.747

Abstract

Postharvest technologies are needed for horticultura commodities because its perishable characteristic. The technics are included cleaning, curing, sorting or grading, degreening, packing, and cooling. Especially in cooling application, there are two variables influenced characteristic of product i.e temperature and hummidity. Temperature of 0-7 ºC and hummidity of 90-95% are recommended to be used because very effective to decrease of water losses, material dextructive of bacterial, growth root, respiration, texture and color changing.
KEBIJAKAN PENGEMBANGAN RUMPUT LAUT DI KABUPATEN MALUKU TENGGARA BARAT Maryadi, Maryadi
Jurnal Sains dan Teknologi Indonesia Vol. 13 No. 1 (2011)
Publisher : Badan Pengkajian dan Penerapan Teknologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (43.351 KB) | DOI: 10.29122/jsti.v13i1.875

Abstract

One of Development Program in Maluku Tenggara Barat Regency is helping people in coastal poorest areas. The program is helping coastal farmers make their seaweed production and processing more profitable and their marketing networks more transparent. It was suggested that local government should has a policy to push out coastal farmers a “new seedling” and best practices method, such as bigger size of seedling, appropriate attachment spacing, daily tender loving care and proper drying practices by using platforms and/or hanging systems. The aim is to improve productivity and product quality to attract better prices.
KEBIJAKAN DAN STRATEGI PENATAAN RUANG KAWASAN PERBATASAN ANTARNEGARA DI PROVINSI NUSA TENGGARA TIMUR widiati, ati
Jurnal Sains dan Teknologi Indonesia Vol. 9 No. 3 (2007)
Publisher : Badan Pengkajian dan Penerapan Teknologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (439.019 KB) | DOI: 10.29122/jsti.v9i3.779

Abstract

It is necessary to formulate spatial policy and strategy in cross-border area in EastNusa Tenggara, in order to manage resources and capability, to increase the quality of life, to conserve the function of environment, and to achieve security. Until now, there is no comprehensive policy and strategy about spatial planning forcross-border area. Using the growth poles concept, this paper tries to arrange a holistic policy and strategy for East Nusa Tenggara spatial planning which is viewed from many development aspects. This paper also describes about the development programmes and activities for 2006-2010 period.
THE CURRENT STATUS AND FUTURE DEVELOPMENT OF BIODIESEL IN INDONESIA Palm Oil today - Jatropha Oil tomorrow habibie, sudirman
Jurnal Sains dan Teknologi Indonesia Vol. 14 No. 1 (2012)
Publisher : Badan Pengkajian dan Penerapan Teknologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (732.404 KB) | DOI: 10.29122/jsti.v14i1.907

Abstract

Di Indonesia terdapat bermacam-macam sumber bahan baku biodiesel, tetapi hanya beberapa yang punya potensi untuk dikembangkan sebagai bahan baku biodiesel karena alasan ekonomi, seperti minyak kelapa, minyak sawit dan minyak jarak. Saat ini, minyak sawit telah menjadi sumber utama biodiesel karena kapasitas produksinya telahmencapai 19 juta ton per tahun, dan hanya kurang lebih 25% untuk konsumsi dalam negeri. Kelebihan kapasitas produksi telah merangsang pengembangan pabrik biodiesel dengan bahan baku minyak sawit. Pabrik biodiesel telah mencapai kapasitas terpasang sekitar 3,3 juta ton per tahun pada tahun 2010. Pada beberapa test, biodiesel dengan bahan baku minyak sawit menunjukan dapat menggerakan mesin diesel sebaikmenggunakan minyak diesel. Sejak minyak sawit adalah minyak untuk makanan (edible oil) dan memanfaatkan tanah-tanah atau lahan-lahan subur maka hal ini akan menjadi masalah dikemudian hari. Oleh karena itu jarak pagar yang dikenal sebagai tanaman subtropic mungkin satu-satunya sumber minyak yang dapat digunakan sebagai bahanbaku biodiesel dimasa depan. Menurut beberapa peneliti, jarak pagar (Jatropha curcas L.) mempunyai beberapa keuntungan, seperti bukan untuk makanan (non edible), mengandung rendemen minyak biji yang tinggi (30-50%) dan produksi minyak per hektar cukup tinggi, dan tumbuh di marginal land, dll. Beberapa proyek memanfaatkan jarakpagar telah dikembangkan di Indonesia, salah satunya adalah Desa Mandiri Energi (energy sufficient villages).
EVALUASI KESESUAIAN LAHAN DAN ARAHAN PEMUPUKAN N, P, DAN K DALAM BUDIDAYA TEBU UNTUK PENGEMBANGAN DAERAH KABUPATEN TULUNGAGUNG Mulyono, Daru
Jurnal Sains dan Teknologi Indonesia Vol. 11 No. 1 (2009)
Publisher : Badan Pengkajian dan Penerapan Teknologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (67.355 KB) | DOI: 10.29122/jsti.v11i1.811

Abstract

The objectives of the research are to evaluate the suitability of land for sugarcane growth and give recommendation through land fertilization for optimal sugarcane cultivation. Furthermore, the impacts of this action are to increase the planting area of sugarcane and productivity. The research use GeographicalInformation System (GIS) in Tulungagung Regency, starting from June until October 2004. The results of the research showed that the suitable, conditionally suitable, and not suitable land for sugarcane cultivation in Tulungagung Regency reach to a high of 45,651 ha, 61,547 ha, and 6,038 ha respectively. Based on the soil condition with low contents of N, P and K, the dosage calculation of N, P, and K fertilizers for optimal sugarcane cultivation reach to a high of: N (ZA) = 500 kg/ha, P (SP-36) = 215 kg/ha, and K (KCl) = 260 kg/ha.
IDENTIFIKASI DAERAH RAWAN BENCANA TANAH LONGSOR DI PROVINSI LAMPUNG Prawiradisastra, Suryana
Jurnal Sains dan Teknologi Indonesia Vol. 15 No. 1 (2013)
Publisher : Badan Pengkajian dan Penerapan Teknologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (673.072 KB) | DOI: 10.29122/jsti.v15i1.939

Abstract

Luas wilayah Provinsi Lampung sekitar 35.376 km2 dengan topografi yang memperlihatkan proses erosi yang cukup intensif. Proses erosi yang demikian dipengaruhi oleh bentuk topografi, jenis litologi, struktur geologi, vegetasi dan kondisi iklim lokal. Pola pengaliran/drainase yang ada di wilayah ini memperlihatkan pola/bentuk dendritik dan sub radial, bentuk ini dipengaruhi oleh litologi dan struktur geologi. Wilayah barat Provinsi Lampung merupakan daerah rawan tanah longsor karena sebagian besar terdiri dari material vulkanik muda dan daerah sesar aktif. Kejadian tanah longsor setiap tahun terjadi di Provinsi Lampung, oleh karena itu perlu ada identifikasi. Tingkat kerawanan tanah longsor ditentukan oleh beberapa parameter, yaitu : kemiringan, intensitas hujan, geologi dan tataguna lahan. Berdasarkan itu, luas wilayah rawan di Provinsi Lampung sekitar 83 % dari luas keseluruhan wilayah.

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