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INDONESIA
Teknologi Indonesia
Published by Lembaga Ilmu Pengetahuan Indonesia
ISSN : 01261533     EISSN : 23031913     DOI : -
Core Subject : Science,
Computer Science & IT
JTI is a journal in the Departement of Engineering Sciences - Indonesian Institute of Sciences (LIPI). JTI has policy to publish a new and original research paper or a review paper in The scope of Technology. JTI publishes two issues per year. The journal has been registered with printed-ISSN number as 0126-1533 and electronic ISSN number as 2303-1913.
Arjuna Subject : -
Articles 163 Documents
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FLYWHEEL AS THE KINETIC ENERGY STORAGE IN A GENERATOR SYSTEM: EXPERIMENTAL AND SIMULATION Tetuko, Anggito Pringgo; Juliyana, Ujang T; Purwanto, Budi A; Kurniawan, Candra; Setiadi, Eko A; Andrameda, Yurian A; Ginting, Masno; Sebayang, Perdamean
Teknologi Indonesia Vol 41, No 1 (2018)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v41i1.529

Abstract

In this paper, a flywheel generator system as a kinetic energy storage was analysed that consists of both theoretical models (analytical and numerical) and experimental. The analytical model was solved to calculate the kinetic energy stored and the moment of inertia of the flywheel. On the other hand, the numerical model was developed to analyse the stress and the deformation distributions on the flywheel. The experiments were conducted by varying the flywheel mass of 15-18 kg; and the pulley ratio of 1:1, 2:1, 3:1. The numerical simulation confirmed that the stress and the deformation values on the flywheel were under the material ultimate stress. The experimental results suggested that the increase of the flywheel mass also increases the capability of the flywheel to store the kinetic energy. A similar trend also found in the pulley ratio variations where the increase of the pulley ratio enhances the rotational speed of the generator thus increasing its electricity generation.
MICROSTRUCTURE AND MECHANICAL PROPERTIES BY ADDITION OF Zn AND TiH2 IN QUATERNARY Mg ALLOY FOAM Lestari, Franciska Pramuji; Julhida, Fajar; Erryani, Aprilia; Kartika, Ika
Teknologi Indonesia Vol 41, No 1 (2018)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v41i1.532

Abstract

In our current work, magnesium alloy foams with closed-cell were successfully fabricated by using space holder method, respectively.In this study, sintering process in powder metallurgy was chosen tofabricate quaternary porous Mg-Ca-Zn-TiH2 with addition NaCl as space holder and Zn as alloying. Effect of NaCl and Zn addition on porosity, phase formation and mechanical properties was observed. Sintering process was done in constant temperature sintering 600°C and holding time for 5 hours under Argon atmosphere. The porosity was evaluate with Archimedes method, while the porous structure of the resulted alloys was examined using Scanning Electron Microscope (SEM), and the phase formation was characterized by X-ray diffraction (XRD) analysis. Mechanical properties were examined using compression testing. From this study, decreasing TiH2 and increasing of Zn content in Mg alloy will increase the compressive strength because of reducing the porosity. Furthermore, according to the results, the porous Mg alloy could be considered one of the most promising scaffold materials for hard tissue regeneration. 
EXPLORATION OF POTENTIAL TREE SPECIES IN SUMBA ISLAND Lestari, Eka; Amin, Yusup; Pramasari, Dwi Ajias; Dwianto, Wahyu
Teknologi Indonesia Vol 41, No 1 (2018)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (16.054 KB) | DOI: 10.14203/jti.v41i1.446

Abstract

ABSTRACTSumba Island is a part of Wallace region which located in between Asia and Australia continents. Therefore it has a lot of endemic flora and fauna species. Laiwangi Wanggameti National Park (LWNP) is one of area in Sumba Islands which represented of this condition. The aim of this study is to determine the potential of tree species in Sumba Island based on strength class and commercial class. The wood samples were taken from 9 plots by wood increment borer at 1.3 meters height (breast height). The physical properties (specific gravity) were measured to determine the wood strength classes. The results found 35 species of potential tree species which can be classified into strength class II (13 species), III (19 species), IV (2 species), and V (1 species). Based on commercial classes, 63% of the tree species were classified into lesser known timbers. Furthermore, we think the potential tree from LWNP can be used for research purpose in forestry, especially in domestication study. Keywords: wood strength class, commercial class, bor riap, Laiwangi Wanggameti National Park, domestication ABSTRAKPulau Sumba merupakan bagian dari kawasan Wallacea yang berada di antara Benua Asia dan Australia. Oleh karena itu, pulau ini memiliki banyak flora dan fauna endemik. Taman Nasional Laiwangi Wanggameti (TNLW) adalah suatu wilayah di Pulau Sumba yang merepresentasikan kondisi secara umum di kawasan tersebut. Tujuan dari penelitian ini adalah untuk menentukan jenis kayu potensial di Pulau Sumba berdasarkan kelas kuat dan kelas komersial. Sampel kayu diambil dari 9 plot dengan menggunakan bor riap pada ketinggian 1,3 meter (setinggi dada). Sifat fisik (berat jenis) diukur untuk menentukan kelas kuat kayu. Hasil menunjukkan bahwa ditemukan 35 jenis kayu yang potensial yang dapat diklasifikasikan ke dalam kelas kuat II (13 jenis), III (19 jenis), IV (2 jenis), dan V (1 jenis). Berdasarkan kelas komersial, 63% jenis kayu yang didapatkan merupakan jenis kayu yang kurang dikenal. Oleh karena itu, jenis-jenis kayu yang potensial dari TNLW ini dapat digunakan untuk kepentingan penelitian di bidang kehutanan, lebih khususnya pada penelitian tentang proses domestikasi jenis-jenis tersebut. Kata Kunci: kelas kuat kayu, kelas komersial, increment borer, Taman Nasional Laiwangi Wanggameti, domestikasi

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