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Widyariset
Published by Pusbindiklat Peneliti LIPI
ISSN : -     EISSN : 24610976     DOI : 10.14203
Core Subject : Science, Engineering,
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Widyariset is a scientific journal which publishes the results of research and development, assessment, and systematic thinking about Natural Science.
Arjuna Subject : Umum - Umum
Articles 25 Documents
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Search results for , issue "Vol 14, No 3 (2011): Widyariset" : 25 Documents clear
POTENTIAL EVALUATION OF SOME CROSSES AS RESTORER PARENT ON HYBRID RICE DEVELOPMENT Yuniati Pieter Munarso
Widyariset Vol 14, No 3 (2011): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.14.3.2011.489-496

Abstract

Development of hybrid rice using three-lines method in Indonesia is handicapped by low and varied restor-ing ability of restorer line. Most of available restorer line showed to have varied fertility in its F1 resulted from test cross. This experiment was executed to evaluate some crosses resulted anther culture seed and cytoplasmic male sterile as potential restorers. Amount of 32 crosses were planted and grew in rice fi eld. Observations were made on spikelet fertility, 50% fl owering age, anther color, and phenotypic acceptability. Result shows that 4 (four) crosses were found to have spikelet fertility of more than 75%. They were IR70731A/KA74-2, IR70364A/KA78-2, IR58025A/KA26-2, and IR70731A/KA15-2. This result indicated that the male parent of those crosses could be concluded as potential restorer lines
FABRICATION OF STEAM TURBINE SIMULATOR BASED ON FUZZY LOGIC Syukri Yusuf Nasution
Widyariset Vol 14, No 3 (2011): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.14.3.2011.683-691

Abstract

A steam turbine simulator has built successfully. This simulator has 2 types, hardware and software simulator. For the hardware simulator, the pressure input can be simulated until 8 bar. While for the software simulator has 2 specifi  cations those are off-line mode and on-line mode. For off-line mode, this software given numbers as input, and then the numbers simulated according to the formulas. For on-line mode, interface method used to read and control the system hardware directly. The result of on-line mode displayed in real-time graphic. All systems using fuzzy logic as artifi  cial intelligent.
SYNTHESIS AND CHARACTERIZATION OF THERMO SENSITIVE POLYMER PNIPA FOR THERAPEUTIC RADIATION SOURCE Rohadi Awaludin; Herlina Herlina
Widyariset Vol 14, No 3 (2011): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.14.3.2011.607-614

Abstract

Synthesis of poly(N-isopropylacrylamide) (PNIPA) by free radical polymerization has been carried out. NIPA monomer was polymerized by free radical polymerization with the initiator of ammonium persulfate (APS) and tetramethylethylenediamine (TEMED). The purpose was to obtain PNIPA for the base-material of therapeutic radiation source.  Visual observations indicated that the polymer solution showed different properties at 35ºC. FTIR spectrum showed that infrared absorption peaks of the synthesized polymer were almost the same as PNIPA reported before. Viscosity measurement showed that there was a change of viscosity at temperatures of 30–35ºC. Viscosity of the solution increased dramatically with the increase of concentration. The maximum concentration of the polymer solution for radiation source was 5%.
COMPARATIVE STUDY TOXICITY LC 50 AFLATOXIN, OCHRATOXIN, ZEARALENON IN PEANUT (Arachis Hypogaea L) R.Haryo Bimo Setiarto
Widyariset Vol 14, No 3 (2011): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.14.3.2011.535-540

Abstract

Afl atoxin, ochratoxin, zearalenon is a compound resulted from metabolism process Aspergillus fl avus, As-pergillus ochraseaus and Fusarium graminearum which grows in moist peanut. A long period and over dose of afl atoxin, ochratoxin, zearalenon can be caused liver cancer, cirrhosis, carsinoma, chronic hepatitis, jaundice, food absorption disturbance, digestion disturbance and immunosuppressive. This research have focused on com-parative study about toxicity afl atoxin, okhratoxin and zearolenon compound. The result of toxicity test by using Artemia salina, it was knowingly detected that LC50 value from crude extract peanut of ochratoxin, zearalenon, afl atoxin was 296.82 ppm, 366.28 ppm, 251.55 ppm respectively. Finally it can be concluded that afl atoxin com-pound from peanut sample had toxicity effect of the most dangerous than other compound (ochratoxin, zearolenon) due to lethal 50% Artemia salina population in smallest concentration.
APPLICATION OF HIGH ALLOY CAST STEEL MATERIAL ON THE GRINDING COMPONENT (HAMMER) IN HAMMER MILL MACHINE Fajar Nurjaman; Slamet Sumardi; Anton Sapto Handoko
Widyariset Vol 14, No 3 (2011): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.14.3.2011.651-656

Abstract

Hammer mill is one kind of machine that needs high durability, especially for grinding components such as hammers, which has a function to crush stone (mineral) in to fi  nely shaped (mesh 80). So these components should be made from materials which have some properties, such as high strength, toughness, and wear resistance. In his experiment, the hammers was made from high alloy cast steel, by using mangan, chrom, and copper as alloying materials. The chemical composition of these hammers are: (1) 3~5% Mn – 3~5% Cr – 3~5% Cu; (2) 4~6% Mn – 3~5% Cr – 7~9% Cu; (3) 3~5% Mn – 4~6% Cr – 7~9% Cu; (4) 3~5% Mn – 3~5% Cr – 10~12% Cu; (5) 5~7% Mn – 4~6% Cr – 14~16% Cu. Some of mechanical testing was given to these hammers, such as hardness testing, microstructure analysis testing, and also durability evaluation by using hammer mill machine with capacity 300 kg iron ore/hour. From durability evaluation, those hammers which are made from high alloy cast steel, with mangan, chrom, and copper as alloying material, showed a good result in wear rates by less than 0.4 mm2/kg iron ore. The lowest wear rates of this hammers is 0.14 mm2/kg iron ore, showed by hammers which had a composition 1.6%C – 3.2%Mn – 4.5% Cr – 3.2%Cu with 360 HBN in hardness value.

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