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ASEAN Journal on Science and Technology for Development
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.
Arjuna Subject : -
Articles 477 Documents
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The Safety of Building Structures Subject to Unusual Natural and Man-Made Disasters Nguyen Van Pho
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (165.178 KB) | DOI: 10.29037/ajstd.119

Abstract

Previously, we often use the statistical data on natural disasters and mathematical tools such as probabilistic theory, mathematical statistics and random processes to express and analyze natural disasters' phenomena when dealing with the safety problem of building structures subject to natural disasters. However, due to unusual change of the global climate, natural disasters have changed essentially the intensity, frequency and the appearing time so we cannot rely on  the statistical data on natural disasters in the past to do that. Therefore, renovation of the thought on selection of plans, calculation, design, and evaluation of safety of building structures to accommodate to natural disasters and man-made disasters is a required task. This paper presents  some points of view of the authors, including: (i) Why should we renovate our thought on selection of plans, calculation, design, and evaluation of safety of existing structures? (ii) What are the old thought and the new thought on the safety of building structures? (iii) How to renovate the selection of building plan, calculation, design and evaluation of the safety of building structures? and (iv) How were some building structures in Vietnam decided according to the new thought?Some specific examples on the selection of building plan given in this paper are to illustrate the authors' opinions.
Metal Composites Behaviour Under Biaxial Stresses J. Jai; M.N. Berhan
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1232.033 KB) | DOI: 10.29037/ajstd.120

Abstract

For this study, different volume fraction (vol.%) of particulate alumina (Al2O3)reinforced aluminium alloy (Al 6061) with 5 vol.%, 15 vol.% and 25 vol.% are produced by powder metallurgy method. These samples were subjected to biaxial stresses in order to investigate the behaviour of the metal matrix composites (MMCs). Microstructure analysis on the individual sample before and after loading was performed under scanning electron microscopy. The small particles of 2 µm in size have exhibited strong interfacial bonding with the matrix. The particles of 5 µm in size have shown fractures and debonding interface. Large particles of above 20 µm in size have revealed severe fractures and particles pulled out. Behavior of the MMC was explained by relating the microstructures and displacement directions of the undeformed and deformed samples. Some understandings on the behaviour of the MMCs with different vol.% of Al2O3 due to biaxial stresses have been established.
Mapping QTLS Associated with Root Traits Related to Drought Resistance in Vietnamese Upland Rice Nguyen Duc Thanh; Nguyen Thi Kim Lien; Pham Quang Chung; Tran Quoc Trong; Le Thi Bich Thuy; Henry Nguyen
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (170.173 KB) | DOI: 10.29037/ajstd.121

Abstract

Upland rice grows on 19 million ha, about 15% of the world's rice plantation [2]. The production of upland rice is crucial to agricultural economy of many countries [15]. The yield of upland rice is very low with an average of about 1 t/ha. Drought is a major constraint to the productivity of upland rice. In this paper, we present the results on mapping QTLs for root traits related to drought resistance (maximum root length, root thickness, root weight to shoot and deep root weight to shoot ratios) in upland rice using a recombinant inbreed (RI) population derived from a cross between Vietnamese upland rice accessions. The first molecular linked of Vietnamese upland rice were constructed. The map consists of 239 markers (36 SSR and 203 AFLP markers) mapped to all 12 rice chromosomes. This map covered 3973.1 cM of rice genome with an average distance of 16.62 cM between the markers. Twenty three putative QTLs were detected. Among them, four QTLs for MRL, four QTLs for R/SR, four QTLs for DR/SR, two QTL for RN, two QTLs for RT, two for PH, and five QTLs for TN were recorded. There are several SSR markers such as RM250, RM270, RM263, RM242, RM221 linked to QTL regions. They could be very useful for drought resistant selection in rice. Some common QTLs for maximum root length and deep root weight to shoot ratio were observed in different genetic background (RDB09 × R2021 and IR64 × Azorean populations) and ecological locations (IRRI and Vietnam). These QTLs could be very useful for precise locating drought resistant gene(s) and marker-assisted selection.
Radon and its Progeny in Outdoor Air S. J Hu; K. S Tan
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (427.9 KB) | DOI: 10.29037/ajstd.122

Abstract

Radon and its Progeny in Outdoor Air
Source for Gloxinia (Sinningia Spp.) and Potato (Solanum Tuberosum) Micropropagation Duong Tan Nhut; Mai Thi Ngoc Huong
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (237.134 KB) | DOI: 10.29037/ajstd.123

Abstract

An efficient lighting system (Compact 3U) was successfully applied to the micropropagation of gloxinia and potato plants. To compare the in vitro growth of plantlets under Neon and Compact 3U lighting systems, gloxinia and potato shoots were cultured on suitable media at different light intensities: (1) 45 µmol m-2s-1 (under Neon lighting system as a control); (2) 45 µmol m-2s-1, (3) 60µmol m-2s-1, and (4) 75 µmol m-2s-1 (under Compact 3U lighting systems). The results obtained after 3 weeks of in vitro culture and 6 weeks of acclimatization in a greenhouse showed that the growth of plantlets cultured under the Compact 3U system was better than that under Neon lighting system. The Compact 3U lighting source had a highly significant effect on the growth and development of gloxinia and potato plantlets. Besides, the data in our study also indicated that gloxinia and potato plantlets adapted differently to different lighting sources and light intensities.
The Total Capitance, Transient and Frequency Response of MFB, FDNR and Leaperog Techniques For Bilinear Switched-Capacitor Network C. M Hadzer; M. Izhar
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (475.612 KB) | DOI: 10.29037/ajstd.124

Abstract

The Total Capitance, Transient and Frequency Response of MFB, FDNR and Leaperog Techniques For Bilinear Switched-Capacitor Network
Wear of Ceramic Tools When Machining Nodular Cats Iron L.A Husni; C Choudhory; A.K Ghani
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29037/ajstd.125

Abstract

Wear of Ceramic Tools When Machining Nodular Cats Iron
A Low Cost HPIB Compatible Interface to a Thermochuck for Computerised C-V Measurement System C.K Kwok; C.H Ling; R Kanhere; L.K AH
ASEAN Journal on Science and Technology for Development Vol. 5 No. 1 (1988): ASEAN Journal on Science and Technology for Development (AJSTD)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (304.535 KB) | DOI: 10.29037/ajstd.126

Abstract

A Low Cost HPIB Compatible Interface to a Thermochuck for Computerised C-V Measurement System
A Study of Compressive Strength and Density of Aerated Concrete Kraiwood Kiattikomol; Aikachai Sae Lim; Anek Siripanichgorn
ASEAN Journal on Science and Technology for Development Vol. 5 No. 1 (1988): ASEAN Journal on Science and Technology for Development (AJSTD)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (879.243 KB) | DOI: 10.29037/ajstd.127

Abstract

A Study of Compressive Strength and Density of Aerated Concrete
A Study of Organelles Associated with Vitellogenesis in Oncomelania Hupensis Quadrasi, A Molluscan Host of Schictosoma Japonicum F.G Claveria; F.J Etges
ASEAN Journal on Science and Technology for Development Vol. 5 No. 1 (1988): ASEAN Journal on Science and Technology for Development (AJSTD)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1527.774 KB) | DOI: 10.29037/ajstd.128

Abstract

A Study of Organelles Associated with Vitellogenesis in Oncomelania Hupensis Quadrasi, A Molluscan Host of Schictosoma Japonicum

Page 10 of 48 | Total Record : 477

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