cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
-
Editorial Address
-
Location
Kota adm. jakarta selatan,
Dki jakarta
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 6 Documents
 1 
Search results for , issue " Vol 35, No 2 (2012)" : 6 Documents clear
Magnetic Properties Evaluation of Fe-Al Nanocrystalline Alloys Fabricated by Mechanical Alloying Technique as a Function of Milling Time Tarigan, Kontan; Ginting, Masno
Teknologi Indonesia Vol 35, No 2 (2012)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (16.051 KB) | DOI: 10.14203/jti.v35i2.183

Abstract

Magnetic properties of nanocrystalline Fe50Al50 alloys prepared by mechanical alloying technique (using commercial Fe and Al powders as precursors) were studied in detail as a functions of the milling time ranging from 1 to 24 hrs. The structural analyses based on X-ray diffraction (XRD) and extended X-ray absorption fi ne structure spectroscopy (EXAFS) revealed that the alloying process took place after 12 hrs of milling time. Concerning themagnetic behavior, the data that were obtained from a superconducting quantum interference device (SQUID) showed that both the magnetic saturation (Ms) and the coercivity (Hc) depend strongly on the milling time. From the results that we obtain, we found out that by adjusting the milling time, is a key factor in obtaining an appropriate structural transformation and appropriate magnetization values.
Dye-Sensitized Solar Cells Based on Carbon Nanoparticle Counter Electrode Muliani, Lia; Nursam, Natalita
Teknologi Indonesia Vol 35, No 2 (2012)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (16.051 KB) | DOI: 10.14203/jti.v35i2.179

Abstract

The performance of dye-sensitized solar cells (DSSC) is affected by its components. One of the affecting factors is counter electrode. Counter electrode has a function as a catalyst to fasten reaction kinetics during the tri-iodide reduction reaction within the cell. In this paper, the fabrication process of DSSC based on carbon nanoparticle counter electrode is described. The carbon nanoparticle was prepared into carbon paste with variation of solvent. The carbon nanoparticle paste was deposited onto FTO glass substrate (fl uorine-doped tin-oxide) by screen printing tehnique using stainless steel screen. The Characteristic of I-V curve of carbon counter electrode cells was measured using Oriel Sun simulator AM 1.5 with the light intensity of 40 mW.cm-2. The result was compared to cells which are based on platinum counter electrode. The best effi ciency of the cell obtained was 2.0%. and 3,12% for carbon nanoparticle and platinum counter electrode, respectively.
Optimization of Radioisotope Production at Rsg-Gas Reactor Using Deterministic Method Pinem, S; Susilo, J; Tukiran, -; Sembiring, T.M.
Teknologi Indonesia Vol 35, No 2 (2012)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (16.051 KB) | DOI: 10.14203/jti.v35i2.184

Abstract

RSG-GAS is a research reactor operated for radioisotope production, material testing, research and development and also industry and university needs. The radioisotope productions are Mo-99/Tc-99m, TeO2, Iridium, Sm2O3, Gd2O3, MoO3 and others which are needed for hospital and industry. To meet all demand, optimization of irradiation has been done for increasing the target irradiation in the core so that the utilization of RSG-GAS core is also increasing. This is important to be done because the target insertion to the core will change the core characteristic and can disturb the reactor operation safety. This paper will analyz the infl uence of each target insertion and also combination of the targets insertion to the core while considering the reactor operation safety factor. The calculation of the optimization was done by a deterministic method using Standard Reactor Analysis Code (SRAC) computer code. Meanwhile the determination of optimum target was done by analyzing the infl uence ofchanges in the reactivity and radial power peak factor due to the insertion of the target in the core. Based on the calculation the number of maximum target insertion for fi ssion product molybdenum-low enrichment uranium (FPM-LEU) to get Mo-99/Tc-99m in all irradiation positions has been achieved. The E-4 and G-7 are the best core grid positions for the FPM-LEU target with the maximum mass of 21 g. Beside that, several data for calculation of TeO2, Iridium, Sm2O3, Gd2O3, MoO3, targets with different numbers and also combination of all targets have been achieved as well. Research works is ready to be applied in the management of irradiation target for optimum radioisotope production in the RSG-GAS reactor.
Formation and Oxidation Behaviour of Superalloy TMS-82+ Coated With a ?-Phase Re-based Alloy Diffusion Barrier Coatings Thosin, Kemas; Lang, Fengqun; Narita, Toshio
Teknologi Indonesia Vol 35, No 2 (2012)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v35i2.180

Abstract

A novel coating with duplex Re(W)-Cr-Ni and Ni(Cr)Al layers was formed on a nickel-base single-crystal superalloy TMS-82+, by electroplating Re(Ni), Ni(W) and Ni fi lms, followed by Cr-pack and then Al-pack cementations.A continuous Re-Cr-W-Ni ?-phase diffusion barrier was obtained after Cr-pack cementation. Addition of W to the Re-Cr-Ni ? phase decreased the Cr content, resulting in a ? phase with high melting temperature. The as-prepared Al reservoir layer has a duplex, Ni2Al3 and ?-Ni(Cr)Al layer, and during oxidation at 1423K, the Al reservoir layer changed into a ? phase containing (10-13) at %Al for the 1 hr-Al packed coating and into a mixture of ?- Ni(Cr)3Al and ?- Ni(Cr)Al phases for the 5hr-Al packed coating. A protective ?-Al2O3 scale formed during oxidation at 1423K in air, with the parabolic rate constant 7.410-11kg2m-4s-1 for the 1hr-Al packed coating and 6.610-10kg2m-4s-1 for the 5hr-Al packed coating. There was little diffusion through the ? layer during oxidation at 1423K for up to 100 hrs, without changing micro-structure of the TMS-82+ alloy.
The Effect of Manganese, Chromium and Boron into the Hardness and Microstructure of Steel Shot Nurjaman, Fajar
Teknologi Indonesia Vol 35, No 2 (2012)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v35i2.181

Abstract

The objectives of this experiment were to investigate the effect of alloying elements, such as manganese, chromium, and boron, and also the effect of heat treatment into the hardness and microstructure of steel shot. Inthis experiment, a steel shot containing of 0.5?0.8% C was produced. The manufacture of steel shot was carried out by using the injection-pressurized water method. The raw materials, such as steel scrap and alloying elements were melted in an induction furnace. The round shape steel or steel shot with 0.5?3.2 mm in diameter was obtained by injecting the molten steel, which was fl owed from induction furnace into a distributor (pan crucible), by 1.1 atmosphere of pressurized water using a nozzle, and then the steel shot was splashed down into a tank containing water for cooling process. The dimension of pan crucible was in the form of cylinder tube with 300 mm in diameter and 130 mm in length, containing of 107 holes, with 10 mm in diameter for each hole. Some tests were conductedinto steel shot material, there were the hardness testing by using a Rockwell hardness tester, and the microstructure analysis by using an optical microscope. The addition of manganese, chromium, and boron into steel shot caused the hardness value of steel shot signifi cantly increased, 57 HRC for 3.6% Cr and 55 HRC for 2.3% Mn?1.8% Cr?2% B. The heat treatment process, by tempering at temperature 250oC for 5 minutes, produced fi nely martensite on its microstructure with 58 HRC (the hardness of as-manufactured steel shot was 55 HRC).
Local Structure and Magnetic Properties of Ni-Al-C Nanocrystalline Alloys Fabricated by Mechanical Alloying Technique as a Function of Carbon Content Tarigan, Kontan; Ginting, Masno
Teknologi Indonesia Vol 35, No 2 (2012)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v35i2.182

Abstract

Local structural and magnetic characterization of (Ni0.5Al0.5)100-xCx (x = 0, 10, 30, and 50 at. %) nanocrystalline alloys which were prepared by mechanical alloying (MA) technique at 12 hrs milling time, have been carried out in detail. The nanocrystalline size and shape were examined using scanning electron microscopy (SEM). The effect of carbon on structural properties has been investigated using x-ray diffractometer (XRD) and extended x-ray absorption fi ne structure spectroscopy (EXAFS), whereas magnetic properties was examined by vibrating sample magnetometer (VSM). All the samples revealed nanocrystalline alloys. The maximum magnetic saturation (Ms) at about 0.7 emu/g and the minimum coercivity (Hc) at about 135 Oe would be found for 10% carbon content.

Page 1 of 1 | Total Record : 6

 1 

Filter by Year

2012 2012


Reset
Filter By Issues
All Issue Vol 41, No 1 (2018) Vol 40, No 2 (2017) Vol 40, No 1 (2017) Vol 39, No 3 (2016) Vol 39, No 2 (2016) Vol 39, No 1 (2016) Vol 38, No 3 (2015) Vol 38, No 2 (2015) Vol 38, No 1 (2015) Vol 37, No 3 (2014) Vol 37, No 2 (2014) Vol 37, No 1 (2014) Vol 36, No 3 (2013) Vol 36, No 2 (2013) Vol 36, No 1 (2013) Vol 35, No 3 (2012) Vol 35, No 2 (2012) Vol 35, No 1 (2012) Vol 34 (2011) Vol 33, No 2 (2010) Vol 33, No 1 (2010) Vol 32, No 2 (2009) Vol 32, No 1 (2009) More Issue