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ASEAN Journal on Science and Technology for Development

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Published by Universitas Gadjah Mada

ISSN : 22249028 EISSN : 22249028 DOI : -

Core Subject : Science, Education, Engineering,

Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Mathematics

The coverage is focused on, but not limited to, the main areas of activity of ASEAN COST, namely: Biotechnology, Non-Conventional Energy Research, Materials Science and Technology, Marine Sciences, Meteorology and Geophysics, Food Science and Technology, Microelectronics and Information Technology, Space Applications, and Science and Technology Policy, Infrastructure and Resources Development.

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Articles 477 Documents

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A Novel Penalty Scheme in Genetic Algorithms For Structural Design Optimization Pruettha Nanakorn; Konlakartn Meesomklin
ASEAN Journal on Science and Technology for Development Vol. 17 No. 2 (2000): ASEAN Journal on Science and Technology for Development (AJSTD)
Publisher : Universitas Gadjah Mada

A Novel Penalty Scheme in Genetic Algorithms For Structural Design Optimization

Energy Potential and Utilization of Plantation Crops in Malaysia K.O Lim; Zainal Alimudin Zainal Alaudin; Ghulam Abdul Quadir; Mohd, Zulkifly Abdullah
ASEAN Journal on Science and Technology for Development Vol. 17 No. 2 (2000): ASEAN Journal on Science and Technology for Development (AJSTD)
Publisher : Universitas Gadjah Mada

Energy Potential and Utilization of Plantation Crops in Malaysia

Influence of Nitrogen Gas Flow Rate on The Microstructural and Mechanical Properties of Tin Deposited Carbon Steel Synthesized by Cae A. Mubarak; E. Hamzah
ASEAN Journal on Science and Technology for Development Vol. 23 No. 4 (2006): ASEAN Journal on Science and Technology for Development (AJSTD)
Publisher : Universitas Gadjah Mada

This paper reports on the preparation of titanium nitride (TiN) thin films on carbon steel plates, using cathodic arc evaporation CAE PVD technique. We studied and discussed the effect of various nitrogen gas flow rates on microstructural and mechanical properties of TiN-coated carbon steel plates. The coating properties investigated in this work included the surface morphology, thickness of deposited coating, adhesion between the coating and substrate, coating composition, coating crystallography, hardness and surface characterization using a field emission scanning electron microscope (FE-SEM) with energy dispersive X-ray (EDX), Xray diffraction (XRD) with glazing incidence angle (GIA) technique, scratch tester, hardness testing machine, surface roughness tester and atomic force microscope (AFM). SEM analyses showed that all the films had columnar and dense structures with clearly defined substrate-film interfacial layers. The hardness of TiN-coated carbon steel was noted six times more than the hardness of uncoated one. An increase in nitrogen gas flow rate showed; decrease in the formation of macro-droplets, average roughness (Ra) and root-mean-square (RMS) values in CAE PVD technique. During XRD-GIA studies, it was observed that by increasing the nitrogen gas flow rate, the main peak [1,1,1] shifted toward the lower angular position. Microhardness of TiN-coated carbon steel showed about six times increase in hardness than the uncoated one. Scratch tester results showed an average adhesion between the coating material and substrate. Thanks to the high resolution power could be observed that by increasing nitrogen gas flow rate there was percentage increase in the bearing ratio while percentage decrease in histogram.

Modelling Heat Transfer in Cooked Tuna During Cooling Ampawan Tansakul; Tipaporn Ngamna
ASEAN Journal on Science and Technology for Development Vol. 17 No. 2 (2000): ASEAN Journal on Science and Technology for Development (AJSTD)
Publisher : Universitas Gadjah Mada

Modelling Heat Transfer in Cooked Tuna During Cooling

A New Triterpene Glycoside from the Sea Cucumber Holothuria Scabra Collected in Vietnam Nguyen Van Thanh; Nguyen Hai Dang; Phan Van Kiem; Nguyen Xuan Cuong; Hoang Thanh Huong; Chau Van Minh
ASEAN Journal on Science and Technology for Development Vol. 23 No. 4 (2006): ASEAN Journal on Science and Technology for Development (AJSTD)
Publisher : Universitas Gadjah Mada

Bioassay guided fractionation led to the isolation of a new triterpene glycoside, holothurinogenin B (1) along with three known compounds, holothurin B (2), holothurin A (3), and holothurin A2 (4), from the methanol extract of the Vietnamese sea cucumber Holothuria scabra. Their structures were deduced from the spectral analysis (1D-NMR, 2D-NMR, MS) and chemical evidences.

Natural and Combination Fish Aggregating Devices (FADS) as Tools for Fish Aggregation in Lake Kenyir, Trengganu, Malaysia Sakri Ibrahim; Julaihi Matusin; Sukree Hajisamae
ASEAN Journal on Science and Technology for Development Vol. 17 No. 2 (2000): ASEAN Journal on Science and Technology for Development (AJSTD)
Publisher : Universitas Gadjah Mada

Natural and Combination Fish Aggregating Devices (FADS) as Tools for Fish Aggregation in Lake Kenyir, Trengganu, Malaysia

Characteristics of Solid-State Calcium Ion Sensors Based on Photocurable and Selfplasticising Polyacrylate Matrices Lee Yook Heng; Elizabeth A.H. Hall
ASEAN Journal on Science and Technology for Development Vol. 23 No. 4 (2006): ASEAN Journal on Science and Technology for Development (AJSTD)
Publisher : Universitas Gadjah Mada

New membrane materials based on cross-linked poly(n-butyl acrylate) (nBA), have been used successfully as calcium ion-selective membranes. These membrane materials possess selfplasticising property and hence do not require plasticisers. The photocurability and good adhesion characteristics of these polymer matrices enable workable solid-state calcium ion sensors to be fabricated by simple photocure procedures employing the calcium ionophore ETH5234 and a lipophilic additive as ion sensing components. The calcium ion-selectivity of the sensors can be controlled by varying the chemical composition of the photocured membrane. An optimum amount of the cross-linker 2,2-hexanedioldiacrylate (HDDA) and the incorporation of n-heptyl acrylate (nHA) led to improvement in the calcium ion-selectivity. The best calcium ion-selectivity was obtained from a copolymer membrane with composition: nBA = 74 wt-%, nHA = 20 wt-% and HDDA = 0.1 wt-%. The selectivity coefficients of calcium over major cations were: LogKCaPot,Na= -4.4, LogKCaPot,K = -3.6, LogKCa,PotLi = -5.9, LogKCaPot,Mg= -4.4 with a Nernstian slope (29.1 ± 0.8 mV/decade) under buffered conditions. This potentiometric performance is comparable to other solid-state calcium ion sensors with various plasticised polymer membranes.

Optical Sensor Based on Surface Plasmon Resonance Measurements W. Mahmood Mat Yunus; Rosmiza Mokhtar; Mohd Maarof Moksin; Chong Boon Peng; Lee Woei Yeh
ASEAN Journal on Science and Technology for Development Vol. 17 No. 2 (2000): ASEAN Journal on Science and Technology for Development (AJSTD)
Publisher : Universitas Gadjah Mada

Optical Sensor Based on Surface Plasmon Resonance Measurements

Radical Combustion: New Concept For Two Stroke Engines Saqaff A Al-Kaf; Ahmad Suhaimi; Hakim A Abbas
ASEAN Journal on Science and Technology for Development Vol. 17 No. 2 (2000): ASEAN Journal on Science and Technology for Development (AJSTD)
Publisher : Universitas Gadjah Mada

Radical Combustion: New Concept For Two Stroke Engines

Synthesis And Characterization Of Pure-Silica- Zeolite-Beta Membrane Yeong Yin Fong; Subhash Bhatia
ASEAN Journal on Science and Technology for Development Vol. 23 No. 4 (2006): ASEAN Journal on Science and Technology for Development (AJSTD)
Publisher : Universitas Gadjah Mada

The semiconductor industry needs low dielectric constant (low k-value) materials to more advance microprocessor and chips by reducing the size of the device features. In fabricate this context, a new material with lower k value than conventional silica ( k = 3.9 - 4.2 ) is needed in order to improve the circuit performance. As per the recent International Semiconductor Technology plan, a low-k material with a k = 1.6 will be needed by 2010. The choice of the inorganic zeolite membrane is an attractive option for low k material and suitable for microprocess application. In the present study, a pure silica zeolite beta membrane coated on the non-porous stainless steel support was synthesized using in situ crystallization of a gel with the composition of SiO2 : 0.6 TEAOH : 0.6 HF : 10.1 H2O. The crystallization was carried in the presence of tetraethylammonium hydroxide TEA(OH) as structure directing agent, fumed silica, HF and deionized water at pH value of 9. The crystallization under hydrothermal conditions at 130oC was carried out for the time period of 14 days. The membrane was characterized by X-Ray Diffraction ( XRD ), Thermogravimetric Analysis ( TGA ), Nitrogen Adsorption and Scanning Electron Microscope ( SEM ) . SEM micrographs show highly crystalline, truncated square bipyramidal morphology of pure silica zeolite beta was coated on the non-porous stainless steel support. The membrane dielectric constant, k-value was measured as 2.64 which makes it suitable for the microprocessor applications.

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