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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 5 Documents
 1 
Search results for , issue "Vol. 31 No. 1 (2014): ASEAN Journal on Science and Technology for Development (AJSTD)" : 5 Documents clear
Fabrication, Rheology and Antioxidant Activity of Palm Esters-based Emulsions Loaded with Tocotrienol S.H NG; B Mahiran; I Zahariyah
ASEAN Journal on Science and Technology for Development Vol. 31 No. 1 (2014): 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 (1125.424 KB) | DOI: 10.29037/ajstd.23

Abstract

Palm oil esters are wax esters derived from palm oil and oleyl alcohol. Palm oil esters have many applications due to their luxurious moisturizing properties, non-greasy and blend easily with fragrances and colours when applied on skin surface. The aim of this research was to fabricate palm esters-based emulsions cream for topical delivery, characterise the rheological properties and in vitroantioxidant activity of the palm esters-based emulsions system. Emulsions containing palm oil esters loaded with tocotrienol were obtained in two stages, with propagation of rotor-stator at 6000 r.p.m. for 5 min and further emulsified using an ultrasound at various acoustic amplitudes for another 5 min. A stress/rate controlled Kinexus Rheometer with a temperature controller was used to measure the rheological properties of the emulsion. Rheology measurements were performed at 25.0°C ± 0.1°C with 4°/40 mm cone and plate geometry. Thein vitro antioxidant activity was investigated using UV-Vis spectrophotometer.The yield stress of the emulsions increased with increasing acoustic amplitudes. The viscoelasticity of the emulsions were enhanced by the increase in the oil and surfactant concentrations. The emulsions with higher oil phase concentration [30% (w/w)] showed greater elasticity which implied strong dynamic rigidity of the emulsions. The cohesive energy increased significantly with surfactant concentration especially for the emulsions with 30% (w/w) oil phase concentration. The palm oil esters emulsions containing tocotrienol gave higher Trolox equivalent antioxidant capacity values which implied higher antioxidant capability. The tocotrienol in emulsion with 30% (w/w) dispersed phase showed that they were the most stable with longest shelf life and exhibited greater inhibitory effects on the ABTS".
Pd(II) Complexes with Nitrogen-oxygen Donor Ligands: Synthesis, Characterization and Catalytic Activity for Suzuki-Miyaura Cross-coupling Reaction M.T Amalina; B Hadariah; K Karimah; W.I.W Nazihah
ASEAN Journal on Science and Technology for Development Vol. 31 No. 1 (2014): 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 (609.285 KB) | DOI: 10.29037/ajstd.24

Abstract

Inexpensive bidentate Schiff base ligands (O1, O3) and their Pd(II) complexes (OPd1, OPd3) were successfully synthesized and characterized using CHN elemental analysis, FTIR, 1H and 13C NMR, melting point determination, molar conductivity and magnetic moment. It revealed that these Schiff bases behaved as bidentate ligands in their complexes. The spectral data indicated that the ligands co-ordinated through the phenolic oxygen and the azomethine nitrogen atoms. Magnetic momentdata suggested the existence of square planar Pd(II) complexes, while non-electrolytic behaviour indicated the absence of counter ions in chloroform. The Pd(II) complexes showed good catalytic activities for Suzuki-Miyaura cross-coupling reaction between iodobenzene with phenylboronic acid at 1.0 mmol% catalyst loading.
Cigarette Smoking among Male Teenagers in Malaysia ? A Narrative Review R.III P Dioso
ASEAN Journal on Science and Technology for Development Vol. 31 No. 1 (2014): 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 (395.767 KB) | DOI: 10.29037/ajstd.25

Abstract

This narrative review of a contemporary healthcare issue focuses on strategies and healthcare initiatives to curtail the increasing prevalence of active cigarette smoking among male teenagers in Malaysia — a mission of the Malaysian Millennium Development Goal and the United Nations Development Programmes on all health sectors. This narrative review analysed global and Malaysian views on cigarette smoking.  
Forecsting of Hydrological Time Series Data with Lag-one Markov Chain Model M. A Malek; A.M Baki
ASEAN Journal on Science and Technology for Development Vol. 31 No. 1 (2014): 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 (459.943 KB) | DOI: 10.29037/ajstd.26

Abstract

Planning and operation are important elements in water resource management. Rainfall forecasting is one of the conducts commonly used to extend the lead-time for catchments with short response time. However, it is difficult to obtain a high degree of accuracy in rainfall forecasting using deterministic models. Therefore, a probability-based rainfall forecasting model, based on Markov Chain provided a better alternative due to its ability to preserve the basic statistical properties ofthe original series. This method was especially useful in the absence of long-term recorded data, a rampant phenomenon in Malaysia. Comparison of statistics in the generated synthetic rainfall data against those of the observed data revealed that reasonable levels of acceptability were achieved.
Assessment Attributes on Effective Construction Management for Property Developers in Malaysia Ayob Norizam; M.A Malek; I Mohamad
ASEAN Journal on Science and Technology for Development Vol. 31 No. 1 (2014): 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 (248.473 KB) | DOI: 10.29037/ajstd.27

Abstract

Property developers are financially capable of running construction projects. Nevertheless, in Malaysia it was found that many of these construction practitioners failed to provide effective construction management which affected society. The success of a project and its Critical Success Factors (CSFs) are considered as tools to improve the effectiveness of project management. Eventhough many researchers have conducted studies on CSFs, the use of CSFs has remained ambiguous. The main objective of this study is to validate the proposed assessment attributes obtained from the property developers based on CSFs. A questionnaire survey was conducted to validate this predeterminedattributes. Comparison was made with attributes from Project Management Book of Knowledge in order to explore the underlying suitability of the proposed attributes with the study area in terms of climate, economy, etc. Factor Analysis was adopted to investigate the group component relationships. This study focuses on the link between CSFs and the implementation of an effective construction management specifically for property developers in Malaysia.

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