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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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ANALISA KERUSAKAN CONNECTING ROD PADA MESIN DIESEL KENDARAAN BERMOTOR febriyanti, eka
Jurnal Sains dan Teknologi Indonesia Vol. 12 No. 3 (2010)
Publisher : Badan Pengkajian dan Penerapan Teknologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (458.156 KB) | DOI: 10.29122/jsti.v12i3.858

Abstract

Connecting rod and crank pin bearing are important components of automotive diesel engine. If these components failed, all of engine system would be shut down. In this research, these components failed during operation. Detail analysis of the failed surface showed that the failure in connecting rod and crank pin bearing was caused by improper lubrication system. Evidence of improper lubrication system was proved by the existence of black scratch and chipping on crank pin bearing which formed by high friction during operation. High friction affects performance of other pistons and therefore bolts of connecting rod experienced dynamic tension load. With repeated load during operation, crack initiated on the bolts and propagated until the bolt could not withstand the load anymore before they are finally broken.
PERAN TEKNOLOGI INFORMASI DALAM PENGENTASAN KEMISKINAN DI INDONESIA Syahriar, Rizky Qinthara; syahriar, ary
Jurnal Sains dan Teknologi Indonesia Vol. 8 No. 3 (2006)
Publisher : Badan Pengkajian dan Penerapan Teknologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (144.147 KB) | DOI: 10.29122/jsti.v8i3.762

Abstract

A preliminary research on the roles of information can communication technology for poverty alleviation has been done. The research based on analysis of secondary data on ICT access and poverty data during the year 200-2006. It was found that there exist paradoxes where ICT infrastructure mainly concentrated in the capital city and other big cities but poverty mainly concentrated in rural area. These have created complex problem to solve poverty by using ICT. This paper is trying to introduce the roles of ICT and its solution in helping to reduce poverty in Indonesia.
ANALISIS KINERJA PABRIK TEH HITAM “PAHIT MADU” djawardi, djawardi; gunawan, yustiar
Jurnal Sains dan Teknologi Indonesia Vol. 13 No. 3 (2011)
Publisher : Badan Pengkajian dan Penerapan Teknologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (77.903 KB) | DOI: 10.29122/jsti.v13i3.890

Abstract

The business unit's black tea processing of Perkebunan Nusantara suffered a loss of approximately Rp.60 billion. This is caused by the failure to achieve the quality and quantity of production which has been targeted by the management. Black tea processing factory "Pahit Madu" is required to improve the performance of the production process. To improve the production of black tea starts from improved production equipment through improved equipment utilization. One method ofmeasuring the effectiveness of using an apparatus is Overall EquipmentEffectiveness (OEE). OEE calculation results show that black tea factory "Pahit Madu" for four (4) years under the standard. Means, the effectiveness of utilization of equipment in the factory black tea "Pahit Madu" was still very low. This was shown by the low performance equipment in the milling unit, drying unit and sortation unit. Toimprove the performance of the plant should begin by increasing the Cutting Tearing Curling (CTC) machine in milling stations, machines Fluid Bed Dryer (FBD) and Heat Exchanger (HE) at the drying stations, and Winnower machines at the sortation stations.
PENELITIAN ASPEK LINGKUNGAN FISIK PERAIRAN SEKITAR PELABUHAN SABANG Edyanto, CB Herman
Jurnal Sains dan Teknologi Indonesia Vol. 10 No. 2 (2008)
Publisher : Badan Pengkajian dan Penerapan Teknologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (222.415 KB) | DOI: 10.29122/jsti.v10i2.794

Abstract

Ports with all ships movement might be one of the busiest center of activities in the coastal areas. It could be understood since ports become the main gates where passengers and goods are collected and distributed from and to entire of state. The affect from these activities may effect to its degradation of waters quality around port because of oil spill, dismissal of chemicals, liquid and solid waste around it. Sabang port lay in an international fairway trajectory which have crisis to oil spill and other discard materials to the territorial waters Understanding the quality of territorial waters will help to overcome the problems which may be faced at a period to come.
PENGARUH KOMBINASI INTENSITAS NAUNGAN DENGAN ZAT PENGATUR TUMBUH INDOLE BUTIRIC ACID (IBA), NAPHTHALENE ACETIC ACID (NAA), DAN VITAMIN B1 DALAM AKLIMATISASI PERTUMBUHAN BIBIT GAHARU (Aquilaria beccariana) Mulyono, Daru
Jurnal Sains dan Teknologi Indonesia Vol. 14 No. 3 (2012)
Publisher : Badan Pengkajian dan Penerapan Teknologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (64.761 KB) | DOI: 10.29122/jsti.v14i3.922

Abstract

The objective of this research is to know the optimal formula of Indole Butiric Acid (IBA), Naphthalene Acetic Acid (NAA), Vitamine B1 and the combination with shading intensities to the acclimatization of Gaharu stump (Aquilaria beccariana). This research used Factorial Design with basic analysis of Complete Randomized Design in order to know theeffect of treatment. The research was carried out in Agroindustry and Biotechnology Laboratory, Ciampea, Bogor, from July to September 2007. The results of the research showed that after 8 weeks of treatment: (a). The combination of 55 % shading intensity with IBA 15 mg/l + NAA 10 mg/l + Vitamine B1 1 mg/l was the best formula for increasingheight of Gaharu stump 4.660 cm. (b). The combination of 55 % shading intensity with IBA 15 mg/l + NAA 30 mg/l + Vitamine B1 1 mg/l was the best formula for increasing sum of Gaharu leaf stump 12.337 leafs, (c). The combination of 55 % shading intensity with IBA 15 mg/l + NAA 40 mg/l + Vitamine B1 1 mg/l was the best formula for increasing sumof Gaharu root stump 3.783 roots, and (d). The combination of 55 % shading intensity with IBA 15 mg/l + NAA 40 mg/l + Vitamine B1 1 mg/l was the best formula for increasing length of Gaharu root stump 3.686 cm.
PENERAPAN SISTEM INFORMASI UNTUK MANAJEMEN DATA MINERAL Prayogo, Teguh
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 (254.114 KB) | DOI: 10.29122/jsti.v11i2.826

Abstract

Mineral Information System (SIM) is an added value and integrated database system for mineral in Indonesia concerning with the availability of mineral resources, which encompasses the entire aspects of mineral commodity such as geology, mining, geography, exploration, exploitation, processing technology,statistics and its developments. The technologies used in the SIM development are appropriate technology, open platform, Visual Programming using Rapid Application Development tools, and Relational Database Management System (RDBMS). The SIM technology enables users to illustrate and display someinformations regarding to mineral resources easily and rapidly, i.e. local governments, investors, or persons who are interested in mining or mineral development. The SIM technology is benefit for decision makers to support a regulation or urban planning. In this paper, it will be described about visualization model of SIM in application desktop form.
Teknologi Inokulasi Besi Cor Kelabu FC-250 Untuk Mencegah Pengerasan Pada Dove Tale Produk Ragum Tipe 125 Suhadi, Amin; -, Seodihono
Jurnal Sains dan Teknologi Indonesia Vol. 16 No. 2 (2014)
Publisher : Badan Pengkajian dan Penerapan Teknologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (887.916 KB) | DOI: 10.29122/jsti.v16i2.3408

Abstract

Production technology of metal casting industry in Indonesia needs to be improved, especially in the manufacturing of spare parts and box engine made of gray cast iron which has various wall thick such as dove tale construction. Microstructure of gray cast iron is influenced by cooling rate during casting, chemical composition and melting treatment process (inoculation). The part which has the thinnest thickness has the fastest cooling therefore, the grain boundary is smaller compared to other section. As a result this part has highest hardness and difficult to be machined. This research is conducted to solve this problem by modifying melting and solidification treatment process. The research starting from micro structure analysis, composition and mechanical properties tests on the product, and then conducting modification treatment through Taguchi method approach. Experimental results obtained show that the best level settings to control factors which affect to the uniformity of the microstructure and mechanical properties in gray cast iron is the addition of seed inoculation super ® 75, as much as 0.25% with the method of inoculation material entering into the Transfer Ladle.Teknologi produksi pada industri pengecoran di Indonesia masih membutuhkan perbaikan terutama dalam pembuatan komponen mesin perkakas dan peralatan pabrik yang terbuat dari besi tuang kelabu yang mempunyai variasi ketebalan yang besar seperti konstruksi ekor burung (dove tale). Pada pengecoran, struktur mikro dari besi tuang kelabu sangat dipengaruhi oleh kecepatan pendinginan, komposisi kimia dan proses perlakuan pada logam cair (inokulasi). Bagian yang mempunyai ukuran paling tipis mempunyai kecepatan pendinigan paling tinggi karena itu ukuran butirnya jauh lebih kecil dari bagian lain, akibatnya bagian ini mempunyai kekerasan lebih tinggi dan sulit dilakukan pengerjaan mesin. Penelitian ini bertujuan untuk memperbaiki hal ini yang terjadi pada dove taledengan cara memodifikasi proses perlakuan pada cairan besi dan proses pendinginan. Penelitian dimulai dari analisa struktur mikro, pengujian komposisi kimia, pengujian sifat mekanis pada produk kemudian dilakukan modifikasi menggunakan pendekatan metode statistik Taguchi. Hasil penelitian menunjukkan bahwa pengaturan terbaik yang dapat diperoleh untuk mendapatkan keseragaman struktur mikro dan sifat mekanis pada pengecoran besi tuang kelabu adalah penambahan seed inoculation super ® 75, sebesar 0.25% dengan metode pemasukan inokulasi kedalam Ladle pengangkut logam cair.Keywords: carbon, micro structure, hardness, inoculation
Kecenderungan Perkembangan Teknologi Gasifikasi Biomassa: Studi Perbandingan di Beberapa Negara Putera, Prakoso Bhairawa; Hermawati, Wati; Poerbosisworo, Ishelina Rosaira
Jurnal Sains dan Teknologi Indonesia Vol. 17 No. 3 (2015)
Publisher : Badan Pengkajian dan Penerapan Teknologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2131.614 KB) | DOI: 10.29122/jsti.v17i3.3434

Abstract

Biomass gasification in one of the modern technology that was developed by thermochemical conversion. This technology has been developed in many countries. This paper gives an emphasis on developments and trends in the use of gasification technology in some countries (Finland, Denmark, Thailand, Sri Lanka, Cambodia), and learning for Indonesia as well. At least there are five things that could be the key to the success of implementation, namely the ongoing and continuous research and development, the involvement of all actors in research and development activities, the implementation focuses on a small scale first, the roadmap plans into the action with a strong financial support, and the human resources support at national and local levels.Gasifikasi biomassa merupakan salah satu teknologi modern yang dikembangkan melalui konversi termo kimia. Teknologi ini telah banyak dikembangkan di berbagai negara. Makalah ini memberikan penekanan pada perkembangan dan kecenderungan penggunaan teknologi gasifikasi di beberapa negara (Finlandia, Denmark, Thailand, Sri Langka, Kamboja), dan pembelajaran bagi Indonesia. Setidaknya ada lima hal yang dapat menjadi kunci keberhasilan implementasi, yaitu riset dan pengembangan berkelanjutan dan berkesinambungan, pelibatan semua aktor dalam aktivitas riset dan pengembangan, implementasi pada skala kecil dahulu, perencanaan peta jalan hingga aksi dengan dukungan pendanaan yang kuat, dan dukungan sumber daya manusia di tingkat nasional dan lokal.Keywords: biomass gasification, technology trends,comparative study.
KETAKSTABILAN MEMANJANG KAPAL BERSAYAP SEBELUM TINGGAL PERMUKAAN H. Priyatno, Dany; Iskendar, Iskendar
Jurnal Sains dan Teknologi Indonesia Vol. 8 No. 2 (2006)
Publisher : Badan Pengkajian dan Penerapan Teknologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (192.725 KB) | DOI: 10.29122/jsti.v8i2.753

Abstract

Wing in Surface Effect (WiSE) craft or winged ship is a peripatetic transportation floating to surface by exploiting dynamic cushion because surface effect influence and form of the means wing. This craft adopted high speed planning hull for its fuselage hullform design, the lateral and longitudinal instability always occurs during planing mode operations. In this paper the study and investigate both theoretical and experimentals of longitudinal dynamic instability done, especially the porpoising fenomena of the high speed craft in the water territory. Porpoising is the effect as a self-sustained coupled motion of pitching and heaving.
ANALISIS KONDISI BAWAH PERMUKAAN DAN RISIKO BENCANA TANAH LONGSOR UNTUK ARAHAN PENATAAN KAWASAN DI DESA TENGKLIK KECAMATAN TAWANGMANGU KABUPATEN KARANGANYAR JAWA TENGAH Naryanto, Heru Sri
Jurnal Sains dan Teknologi Indonesia Vol. 13 No. 2 (2011)
Publisher : Badan Pengkajian dan Penerapan Teknologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2353.173 KB) | DOI: 10.29122/jsti.v13i2.881

Abstract

Karanganyar District is a hilly area with steep slopes, rock constituent of young volcanic deposits of Lawu Volcano products, thick soil and relatively high rainfall, so it is potential for large landslides in this region. The landuse in the Karanganyar District including the Tengklik Village is generally dominated by rice fields, seasonal gardens and settlements. Plantation made up in areas with steep topography has great influence on erosion and landslides. Similarly, many settlements are built on a slope so that the area is very vulnerable to the threat of landslides. In the rainy season landslides are common. The potential hazard of landslidesoccurred in 14 sub districts in Karanganyar District. Large landslides have occurred in Karanganyar on December 26, 2007 which claimed the lives of 62 people, with the greatest victims were in the Ledoksari Village, Tawangmangu. The Tengklik Village has already experienced creep type landslides, which have destroyed settlements, roads, seasonalgardens and all existing infrastructure in the area. In order to do the proper handling and anticipation of a catastrophic landslide, a variety of technological applications landslides using geographic information system (GIS) was then carried out, to detect the configuration of 2D geoelectrical subsurface prone areas for landslide risk study and regional planning.

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