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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
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Search results for , issue "Vol. 33 No. 1 (2016): ASEAN Journal on Science and Technology for Development (AJSTD)" : 5 Documents clear
A Clinical Audit for Compliance on the Innovated Radiographic Technique at a Radiologic Unit S. Ismanto; C.H. Hassan
ASEAN Journal on Science and Technology for Development Vol. 33 No. 1 (2016): 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 (1114.059 KB) | DOI: 10.29037/ajstd.1

Abstract

This study identifed X-ray laboratory users’ compliance with the innovated radiographic technique and evaluated it’s effectiveness in decreasing risks of repeating unnecessary X-ray exposure. The use of various steps in the standard operating procedures of radiography, proper radiographic technique and critique, practical protection measures, and radiographic positioning practice in X-ray laboratory at a private radiographic academy in Indonesia were audited. Thirty participants were used as the simple random sample. The demographic distribution was divided into, gender, nationality, and practical experience. Generally, out of 30 participants, 20 (67%) complied, and 10 (33%) did not. Radiograph image results showed that proper radiographic technique was effective in decreasing repetitive exposure among X-ray laboratory users.
Optimization of the Photochemical Degradation of Textile Dye Industrial Wastewaters T.H. Dang; T.P. Mai; M.T. Truong; L.T Dao; T.A.N Nguyen
ASEAN Journal on Science and Technology for Development Vol. 33 No. 1 (2016): 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 (722.332 KB) | DOI: 10.29037/ajstd.2

Abstract

In this study, the photochemical degradation via photo-Fenton process was carried out to degrade dyes in textile industrial wastewaters. Experimental design methodology was also applied for optimizing effects of factors which influencethe effective treatment such as ferric dose, hydroperoxide dosage, initial pH, reaction time and initial chemical oxygen demand (COD). Two independent variables namely colour and COD removal efficiencieswere used to evaluate the treatment yield. Under the optimal conditions, ca. 99%  and ca. 88%, colour, and COD were removed, respectively.
Factors Influencing ISO 14001 Firm’s Perceived Environmental Performance in Malaysia S. Rohati; M.N. Norlida; A.N.S.M. Syed Jamal
ASEAN Journal on Science and Technology for Development Vol. 33 No. 1 (2016): 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 (759.403 KB) | DOI: 10.29037/ajstd.3

Abstract

The changes in the global environmental conditions have placed great challenges on governments, industries, and societies. Business organizations are often blamed for being the sources of theseenvironmental problems. This study aimed to examine the factors influencing the perceived environmental performance of firms certified under the ISO 14001 in Malaysia. A total of 268 manufacturing companies responded to the questionnaires. In this study, structural equation modeling was applied to test the hypotheses. It was found that the “environmental policy”, “environmental training”, “regulatory stakeholder’s pressures”, and “customer pressures”, influence the firm’s perceived environmental performance in which “customer pressures”, was found to be the dominant factor. The measure of environmental performance was self-reported due to the lack of available data. Therefore, perceived environmental performance was employed for this study which is aperceived measure based on the dimensions of the ISO 14001 definition. This study provided a model to synthesize both internal (environmental policy and environmental training) and external (regulatory stakeholder’s pressure and customer pressures) constructs that influenced a firm’sperceived environmental performance. The empirical results and insights from interviews shed lights on the practitioners as to how to enhance a firm’s environmental performance through green practices.
Decision-making Processes for a Patient Admitted to the Accident and Emergency Department Requiring Emergency Abdominal X-ray ? A Case Study Y. Yuliawati
ASEAN Journal on Science and Technology for Development Vol. 33 No. 1 (2016): 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 (1069.223 KB) | DOI: 10.29037/ajstd.4

Abstract

This study investigated the application of the various processes involved in decision-making for acase requiring radiologic emergency abdominal X-ray examination to the Accident and Emergency Department in a government-owned hospital in West Java, Indonesia. It is also aimed to evaluate the patient who was experiencing abdominal pain accompanied by bloating, vomiting, severe constipation and abdominal cramps.The decision-making models used for this case were the normative, prescriptive and descriptive judgments. A decision tree in the form of decision options that was employed in this case addressed the normative model of decision-making, while the algorithm and information processing theory focused on the prescriptive model. Lastly, the intuition that was used in this case concentrated on the descriptive model of decision-making. An emergency abdominal X-ray was indicated for the patient ? a prescriptive decision. Options from decision trees were also practiced. However, the patient was in pain; therefore, she was unable to understand the alternatives that were presented. Hence, this choice was suggested by the author because, by intuition, the expectation was that the patient suffered from acute abdominal crisis.
Potential Application of ENR/EPDM Blends B.L. Chan
ASEAN Journal on Science and Technology for Development Vol. 33 No. 1 (2016): 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 (2700.532 KB) | DOI: 10.29037/ajstd.5

Abstract

Since the process and conversion of natural rubber into epoxidized natural rubber (ENR) was discovered and patented by I. R. Gelling of the Malaysian Rubber Product Research Association  (or now known as the Tun Razak laboratory), Brickendonbury, Hertford, in the United Kingdom, there are more than 10 000 technical and technological papers cited in the internet. Information on ENR is available, not only in the the English language but also other languages like Chinese, Malay, French, Thai and even German languages are used.NR is the most versatile and reactive rubber/elastomer. It is an advanced natural rubber which could be potentially used as a starting material for the development of other rubbers, modifie elastomers, for grafting, plastic-based materials and also thermoplastic rubbers. Its reactivity is dependent on its epoxy groups, the opening of its ring structure, and also the subsequent structures of carboxylic groups and the in-situ side-chains “carbon – carbon” double bonds (> C = C <). In some instances, up to 65% epoxidation of NR is possible and achieved for more oil resistance. For these reasons, there are many new and advanced materials which have been formed and developed in the last two decades.Among them, some of the recent research work is listed here. Apart from studies of compounding the ENR itself and its potential uses, there are many rubber-rubber blends and ENR rubber-plastics blends, some of the studies cited are “uses of new and advanced chemicals”  and synthetic rubbers:  ENR/NBR, ENR/PVC, ENR/polylactic acid blends, ENR/copolyester blends, ENR/Copolyamide Blends, ENR/poly (vinylidene fluoride)blends, ENR/Carbon Nanotubes with co-agent Trimethylol Propane Triacrylate, ENR /recycled silicon materials, and ENR/copolymer of n-butyl acrylate/butyl methacrylate “grafted”. Each of these blends has its own characteristics in terms of processing, enhancement of processing like safety, scorch, oil and water resistance properties, or some in the development of potential thermoplastic rubber and its thermoplastic vulcanizates.In this paper, the author would like to share some findingsof the ENR/EPDM blends that have good flexand dynamic properties, relatively low compression set, and tolerant tensile properties that satisfy most rubber products that are required for and used in the industrial, mechanical, and even automotive parts. More importantly, the sliding skid resistance/frictional property and wear resistance of the blends are also examined. In some blends, the thermal dynamic behaviour is also measured over a temperature range depicting the low-temperature stability, its temperature of transition and the dynamic factor like tangent delta (?). These are the potential factors that could enhance the blend properties that give possible, good high speed and traction, applicable in tyres.

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