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
Kab. sleman,
Daerah istimewa yogyakarta
INDONESIA
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 7 Documents
 1 
Search results for , issue "Vol. 22 No. 4 (2005): ASEAN Journal on Science and Technology for Development (AJSTD)" : 7 Documents clear
MARINE NATURAL PRODUCTS AND THEIR POTENTIAL APPLICATION IN THE FUTURE Chau Van Minh; Phan Van Kiem; Nguyen Hai Dang
ASEAN Journal on Science and Technology for Development Vol. 22 No. 4 (2005): 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 (207.563 KB) | DOI: 10.29037/ajstd.167

Abstract

.
A COMPARISON OF THE PUSH AND PULL PRODUCTION SYSTEMS AT THEIR OPTI MAL DESIGNS UNDER THE ECONOMIC CONSIDERATION N. Chiadamrong; P. Kohly
ASEAN Journal on Science and Technology for Development Vol. 22 No. 4 (2005): 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 (381.901 KB) | DOI: 10.29037/ajstd.168

Abstract

The term “push” and “pull” have been used to explain a wide variety of production inventory systems. The distinction refers to a specific attribute, which can be identified by observing the mechanisms for controlling material flow on the shop floor and a specific policy for the management of inventories and production schedules. This paper gives an attempt to compare these systems under their optimal settings under a constraint resource. Two optimal-seeking methods (Taguchi method and Response Surface Methodology) are used to suggest the optimized design of the system under an economic term, which is the profit generated from the system. Then, a fair comparison can be made where each system is operating at its optimal design. Results from this study will reveal an in teresting outcome, letting us know the impact of the push and pull mechanisms on the systems’ operating costs as well as their profits. 
BLACK AND WHITE LAHAR AS INORGANIC SUPPORT FOR THE IMMOBILIZATION OF YEAST INVERTASE Veronica C. Sabularse; Mayrene T. Tud; Marivic S. Lacsamana; Josefina L. Solivas
ASEAN Journal on Science and Technology for Development Vol. 22 No. 4 (2005): 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 (168.973 KB) | DOI: 10.29037/ajstd.169

Abstract

Volcanic ejecta or lahar can serve as an inorganic support for the immobilization of invertase. Pampanga and Bicol lahar samples were pretreated by ignition at 550oC for 5 hrs followed by concentrated hydrochloric acid treatment, activatedby reaction with aminopropyltriethoxysilane (APTS) and then covalently bound to invertase using glutaraldehyde as linker. Chemical tests confirmed the attachment of APTS to lahar and glutaraldehyde to silanized lahar. The quantity of immobilized invertase on Pampanga white, Pampanga black and Bicol black lahar were 98.73%, 96.73% and 84.27%,respectively. Conditions for maximum activity of invertase immobilized on Pampanga white lahar were pH 3.5, 45oC and 0.3 M sucrose concentration. The Kmand Vmaxfor free invertase and immobilized invertase on Pampanga white lahar were 2.37 M and 48.75 mmol/min, and 3.88 M and 38.87 mmol/min, respectively. Invertase bound to Pampanga white lahar was most stable towards repeated and continuous use and towards storage with intermittent use as indicated by its relatively greater activity. 
RECYCLED PET FOR RICE HUSK/POLYESTER COMPOSITES I. Ahmad; D. R. Abu Bakar; S. N. Mokhilas; A Ramli
ASEAN Journal on Science and Technology for Development Vol. 22 No. 4 (2005): 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 (421.333 KB) | DOI: 10.29037/ajstd.170

Abstract

Rice husks were combined with unsaturated polyester resin, synthesized from glycolysed product of poly (ethylene terephthalate) (PET) waste to form rice husk (RH)/polyester composites. PET from post-consumer soft drink bottles was recycled through glycolysis, followed by polyesterified with maleic anhydride and then cross-linked with styrene to producea formulation for the resin. Characterizations of the synthesized resin were performed byhydroxyl, acid values and Fourier Transform InfraRed (FTIR) techniques. The effect of filler loading and surface modification of rice husks on the mechanical properties of the composites were also investigated. It has been observed that the increasing filler loading resulted in reduction of tensile strength, elongation at break and impact strength but increased tensilemodulus and hardness. At similar filler loading, alkalized filler composites have higher mechanical properties. 
PHOTOCATALYTIC REMOVAL OF TR I- AND HEXA-VALENT CHROMIUM IONS FROM CHROME-ELECTROPL ATING WASTEWATER Puangrat Kajitvichyanukul; Chulaluck Changul
ASEAN Journal on Science and Technology for Development Vol. 22 No. 4 (2005): 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 (102.651 KB) | DOI: 10.29037/ajstd.171

Abstract

A novel technique based on photocatalysis was applied to eliminate chromium ions, a toxic hazardous environmental pollutant. The photoreduction of each species of chromium (total, hexavalent, and trivalent chromiums) from chrome-electroplating wastewater was investigated using a titanium dioxide suspension under irradiation by a low-pressure mercury lamp. The initial concentration of total chromium was 300 mg/l. The applied conditions were the direct photocatalytic reduction process at pH 3.65 and the indirect photocatalytic reduction with added hole scavengers at the same solution pH. Results from both processes were comparatively discussed. Result show that chromium was not efficiently removed by direct photoreduction. In contrast, with the adding of hole scavengers, which were formate ions, the photoreduction of chromium was very favorable. Both hexavalent and trivalent chromiums were efficiently removed. The photocatalytic mechanism is purposed in this study. 
SUITABILITY OF SAGO STARCH BLENDED WITH ACRYLAMIDE AS AN ADDITIVE ON HANDSHEETS MADE FROM RECYCLED PULP FIBERS Wong Sin Yeng; Paridah Md. Tahir; Liew Kang Chiang
ASEAN Journal on Science and Technology for Development Vol. 22 No. 4 (2005): 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 (169.112 KB) | DOI: 10.29037/ajstd.172

Abstract

This study was carried out to determine the suitability of sago starch blended with acrylamide as paper additive. Solutions of unmodified and blended sago starch with acrylamide, were prepared at 5% weight over volume (w/v) basis before the basic properties (i.e., pH, viscosity and solid content) were determined. Thestarches were thenused to coat on laboratory made handsheets from recycled pulps. Various effects were studied, namely, modification of sago starch, addition of different types of initiator and further curing at different temperatures. The incorporation of acrylamide into sago starch through blending signif icantly increased the pH and viscosity of the solutions. All the blended starches remained biologically resistant even after 14 days of exposure to ambient temperature. Solutionof sago starch blended with acrylamide, gave superior performance when coated on the handsheets, producing handsheets with high folding endurance (110 times) and crushstrength (128 N) ascompared to the handsheets coated with the unmodified sago starch. Nevertheless, the smoothness and air permeance of these papers were unsatisfactory due to insufficient curing shown by the micrographs. The use of ceric ammonium nitrate (CAN) as initiator and further curing at 50oC however, were able to improve the smoothness and air permeance properties.
STUDIES ON FUCOIDAN AND ITS PRODUCTION FROM VIETNAMESE BROWN SEAWEEDS Bui Minh Ly; Ngo Quoc Buu; Nguyen Duy Nhut; Pham Duc Thinh; Tran Thi Thanh Van
ASEAN Journal on Science and Technology for Development Vol. 22 No. 4 (2005): 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 (223.763 KB) | DOI: 10.29037/ajstd.173

Abstract

Sulfated fucans are among the most widely studied of all the sulfated polysaccharides of plant origin that exhibit biological activities in mammalian systems. In this report fucoidans from some Vietnamese Sargassumspecies such as S.polycystum, S.oligocystum, S.mcclurei, S. Swartzii and denticaprum were extracted and fractionated on a DEAE-Sephadex A-25 column. On the basis of chemical and spectral analyses, the fucoidan fractions obtained were found to be the sulfated fucogalactans containing sulfate ester groups and uronic acid, and composed essentially of fucose and galactose, as well as a minor amount of other sugars. The polysaccharide fractions were tested for anticancer activity. The primarily obtained results showed that all fucoidan fractions isolated from S. swartziidemonstrate bioactivity effects against cancer cells, while fraction F5 with a highest sulfate content exhibits the strongest anti-invasion activity. This indicates that sulfate content plays an important role in the anticancer activity of the brown algal fucoidans. A laboratory scale pilot for fuco idan production from Vietnamese brown seaweeds has been set with a capacity of 500 g of crude fucoidan per day. 

Page 1 of 1 | Total Record : 7

 1 

Filter by Year

2005 2005


Reset
Filter By Issues
All Issue Vol. 39 No. 3 (2022): Land, Energy, and Water Resources Vol. 39 No. 2 (2022): Green Economy Vol. 39 No. 1 (2022): Community Resilience Vol. 38 No. 3 (2021): Embrace Potential Vol. 38 No. 2 (2021): Repurpose & Redefine Vol. 38 No. 1 (2021): A New Perspective on Development Vol. 37 No. 3 (2020): Movement Vol. 37 No. 2 (2020): The Perennial Quest Vol. 37 No. 1 (2020): Earth, Water & Fire Vol. 36 No. 1 (2019): Vol 36 No 1 (2019) Vol. 36 No. 3 (2019): Ahead of the Storm Vol. 36 No. 2 (2019): Across the Archipelago Vol. 35 No. 1-2 (2018): Extent of transfer of alien invasive organisms in South/Southeast Asia regio Vol. 35 No. 3 (2018): Developments in Nuclear Techniques in the Treatment of Cancer Vol. 34 No. 2 (2017): Vol 34 No 2 (2017) Vol. 34 No. 1 (2017): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 33 No. 2 (2016): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 33 No. 1 (2016): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 32 No. 2 (2015): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 32 No. 1 (2015): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 31 No. 2 (2014): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 31 No. 1 (2014): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 30 No. 1-2 (2013): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 29 No. 2 (2012): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 29 No. 1 (2012): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 28 No. 2 (2011): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 27 No. 1 (2010): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 26 No. 1 (2009): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 25 No. 2 (2008): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 25 No. 1 (2008): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 24 No. 1-2 (2007): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 24 No. 4 (2007): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 23 No. 1-2 (2006): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 23 No. 4 (2006): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 23 No. 3 (2006): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 22 No. 4 (2005): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 22 No. 3 (2005): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 21 No. 1 (2004): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 20 No. 3-4 (2003): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 20 No. 1 (2003): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 19 No. 2 (2002): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 19 No. 1 (2002): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 18 No. 2 (2001): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 18 No. 1 (2001): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 17 No. 2 (2000): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 17 No. 1 (2000): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 10 No. 2 (1993): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 8 No. 2 (1991): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 7 No. 1 (1990): ASEAN Journal on Science and Technology for Development Vol. 5 No. 2 (1988): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 5 No. 1 (1988): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 4 No. 2 (1987): Vol. 4 No. 2 (1987) Vol. 4 No. 1 (1987): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 3 No. 1 (1986): Vol. 3 No. 1 (1986) Vol. 2 No. 1 (1985): Vol. 2 No. 1 (1985) Vol. 1 No. 1 (1984): Vol. 1 No. 1 (1984) More Issue