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76 articles for “R.A. Bakar”
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Research ArticleOpen accessIn the author namesA Technique for Quality Evaluation of E-Learning from Developers PerspectiveMajdi Abdellatief, Abu Bakar Md Sultan, Marzanah A. Jabar, Rusli AbdullahProblem statement: E-learning is gaining more acceptance as days pass because it provides learning opportunity any time and in any place. Different people have different preferences in terms of learning style such as reading text, listing audio or video, speaking and communication. To support these different learning preferences, there is need for multiple e-learning delivery methods and teaching techniques. Furthermore, … …American Journal of Economics and Business Administration, Vol. 3, Issue 1 · 31 Jan 2011 · 9,487 accessesView PDFCite
Research ArticleOpen accessIn the author namesAn Enhanced Russell Measure of Super-Efficiency for Ranking Efficient Units in Data Envelopment AnalysisAli Ashrafi, Azmi Bin Jaafar, Lai Soon Lee, Mohd Rizam Abu BakarProblem statement: Conventional Data Envelopment Analysis (DEA) helps decision makers to discriminate between efficient and inefficient Decision Making Units (DMUs). However, DEA does not provide more information about the efficient DMUs. Super-efficiency DEA model can be used in ranking the performance of efficient DMUs. Because of the possible infeasibility of radial super-efficiency DEA model, the ranking has been limited to … …American Journal of Applied Sciences, Vol. 8, Issue 1 · 31 Jan 2011 · 8,800 accessesView PDFCite
Research ArticleOpen accessIn the author namesEffect of Ethanol Addition in the Combustion Process During Warm-UPS and Half Open Throttle on Port-Injection Gasoline EngineBeny Cahyono, Rosli Abu BakarProblem statement: Ethanol is an alternative fuel with huge potential that can be used in gasoline engines. Addition of ethanol in fuel will affect the fuel properties, fuel properties change will affect the engine performance. Approach: To determine the effect of adding ethanol to gasoline engines, in this study are tested using gasoline, ethanol 10 and 20% ethanol. Results: Testing … …American Journal of Engineering and Applied Sciences, Vol. 4, Issue 1 · 28 Jan 2011 · 8,350 accessesView PDFCite
Research ArticleOpen accessIn the author namesValidated High Performance Liquid Chromatographic Method for Analysis of Fenvalerate Pesticide in Chilies by QuEChERS Extraction Cleanup and High Liquid ChromatographyAhmed Ambarak Altorshani, Nor Kartini Abu Bakar, Eltayeb Elamin M. EidProblem statement: Contamination associated with pesticide use has increased as well, adversely impacting the environment and causing human health risks through residues on food. Approach: This study reports the extraction of Fenvalerate (FE) in chilies using QuEChERS based on High Performance Liquid Chromatography (HPLC) describes a simple, fast and inexpensive method. The chillie was extracted with acetonitrile Aliquots were cleaned-up … …American Journal of Applied Sciences, Vol. 7, Issue 12 · 31 Dec 2010 · 7,168 accessesView PDFCite
Research ArticleOpen accessIn the author namesTransient in-Cylinder Gas Flow Characteristics of Single Cylinder Port Injection Hydrogen Fueled EngineM. M. Rahman, Khalaf I. Hamada, M. M. Noor et al.Problem statement: The variation of the in-cylinder gas flow characteristics for single cylinder port injection hydrogen fueled internal combustion engine was investigated through transient state simulation. Approach: One dimensional gas dynamics was described the flow and heat transfer in the components of the engine model. Special attention is paid to selection and correction of heat transfer correlation which describe of … …American Journal of Applied Sciences, Vol. 7, Issue 10 · 31 Oct 2010 · 8,653 accessesView PDFCite
Research ArticleOpen accessIn the author namesEffect of Temperature and Time to the Antioxidant Activity in Plecranthus amboinicus Lour.Mohd S. Azman Abdul Rahim, Jailani Salihon, Mashitah Mohd Yusoff et al.Problem statement: Processing of food involving heat will contribute to loss of nutritional content, thus it is important to measure and control temperature and time to reduce the loss. Approach: Examine the effects of variations in boiling temperature and boiling time on the antioxidant activity of the boiling extract of Plecranthus amboinicus Lour. Fresh plants were boiled at 45, 60, … …American Journal of Applied Sciences, Vol. 7, Issue 9 · 30 Sep 2010 · 9,254 accessesView PDFCite
Research ArticleOpen accessIn the author namesThe Effect of Spring Design as Return Cycle of Two Stroke Spark Ignition Linear Engine on the Combustion Process and PerformanceA. Z.M. Fathallah, R. A. BakarProblem statements: The effects of optimization on spring design of the linear engine with spring mechanism in its performance and combustion process have been examined. However, at certain conditions the engine can not work properly as predicted. This can happen because displacement of engine stroke is depending on thrust forces of combustion process in cylinder of the engine. For that, … …American Journal of Engineering and Applied Sciences, Vol. 3, Issue 2 · 30 Jun 2010 · 7,519 accessesView PDFCite
Research ArticleOpen accessIn the author namesIn-Cylinder Heat Transfer Characteristics of Hydrogen Fueled Engine: A Steady State ApproachM. M. Rahman, Khalaf I. Hamada, M. M. Noor et al.This study presents in-cylinder heat transfer characteristics of a single cylinder port injection Hydrogen fueled Internal Combustion Engine (H2ICE) using a steady state approach. Problem statement: The differences in characteristics between hydrogen and hydrocarbon fuels are led to the difference in the behavior of physical processes during engine cycle. One of these processes is the in-cylinder heat transfer. Approach: One … …American Journal of Environmental Sciences, Vol. 6, Issue 2 · 30 Apr 2010 · 7,431 accessesView PDFCite
Research ArticleOpen accessIn the author namesThe Inhibition of Human Pathogens: Trichophyton rubrum and Trichoderma harzianum by a Natural ProductRand R. Hafidh, A.S. Abdulamir, Law Se Vern, Fatimah Abu BakarProblem statement: A number of studies have recently conducted to identify novel and potent antifungal components from natural products. One of the reasons is to overcome the antifungal resistant developed against most of commercially available drugs. Studies confirmed that mung beans have increased phenolic compounds and enhanced defenses during germination. Approach: We hypothesized that antifungal activities might be found in … …American Journal of Biochemistry and Biotechnology, Vol. 6, Issue 1 · 31 Mar 2010 · 9,365 accessesView PDFCite
Research ArticleOpen accessIn the author namesPractical and Novel Sterilization Approach for the Pathogenic Staphylococcus aureus BacteriaRaftari Mohammad, Azizi Jalilian Farid, A.S. Abdulamir et al.Problem statement: Decontaminating meat surfaces has been the big concern of meat industry. Thus, various intervention strategies have been studied to reduce the level of bacteria on animals’ carcass surfaces. Approach: Mixture of different concentrations 1, 1.5 and 2% of acetic, lactic, propionic and formic acids at 1:1 ratio were spray washed on inoculated meat to evaluate their efficacy in … …American Journal of Infectious Diseases, Vol. 5, Issue 4 · 31 Dec 2009 · 6,805 accessesView PDFCite