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15 articles for “E.R. El-Zahar”
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Research ArticleOpen accessIn the author namesA Comparison of Explicit Semi-Analytical Numerical Integration Methods for Solving Stiff ODE SystemsE.R. El-Zahar, H.M. Habib, M.M. Rashidi, I.M. El-DesokyIn this study, a comparison among three semi-analytical numerical integration algorithms for solving stiff ODE systems is presented. The algorithms are based on Differential Transform Method (DTM) which are Multiple-Step DTM (MsDTM), Enhanced MsDTM (E-MsDTM) and MsDTM with Padé approximants (MsDTM-P). These methods can be classified as explicit one step semi-analytical numerical integration methods. The error and stability analysis of … …American Journal of Applied Sciences, Vol. 12, Issue 5 · 26 Jun 2015 · 6,957 accessesView PDFCite
Research ArticleOpen accessIn the author namesA Non-Linear Absolutely-Stable Explicit Numerical Integration Algorithm for Stiff Initial-Value ProblemsEssam R. El-ZaharThe time-step in integration process has two restrictions. The first one is the time step restriction due to accuracy requirement τac and the second one is the time-step restriction due to stability requirement τst. The most of explicit methods have small stability regions and consequently small τst. It obliges us to solve stiff problems with small step size τst << … …American Journal of Applied Sciences, Vol. 10, Issue 11 · 11 Sep 2013 · 7,565 accessesView PDFCite
Research ArticleOpen accessIn the author namesMolecular Identification and Antioxidant Profiling of Penicillium heteringtonii EUA-017 from Mangrove (Avicennia alba) in West Sumatra, IndonesiaAnthoni Agustien, Djong Hon Tjong, Yetria Rilda et al.Mangrove ecosystems harbor diverse endophytic fungi that produce bioactive secondary metabolites with potential antioxidant activities. This study aimed to identify an endophytic fungal isolate (EUA-017) from Avicennia alba mangroves in West Sumatra, Indonesia, and characterize its antioxidant metabolites. Molecular identification was performed using internal transcribed spacer (ITS) region sequencing. Secondary metabolites from ethyl acetate extracts were characterized using Fourier-transform infrared … …OnLine Journal of Biological Sciences, Vol. 25, Issue 4 · 25 Mar 2026 · 1,413 accessesView PDFCite
Research ArticleOpen accessIn the author namesCultivation of Antioxidant-Producing Endophytic Fungus in Rhizophora apiculata Mangrove PlantsAnthoni Agustien, Putra Santoso, Siti Zaharani Zalamah et al.West Sumatra is known as one of the largest areas of mangrove forests in Indonesia, dominated by Rhizophora. Therefore, there will be huge opportunities to discover new types or strains of endophytes and antioxidant compounds, which play an important role in protecting cells caused by free radicals, preventing oxidation, and protecting the human body from ROS. This study aims to … …OnLine Journal of Biological Sciences, Vol. 24, Issue 4 · 4 Aug 2024 · 5,002 accessesView PDFCite
Research ArticleOpen accessIn the author namesEnzymatic Hydrolysis of Pretreated Kenaf using a Recombinant Xylanase: Effects of Reaction Conditions for Optimum Hemicellulose HydrolysisNur Izyan Wan Azelee, Jamaliah Md Jahim, Ahmad Fauzi Ismail et al.An efficient hemicellulose hydrolysis has now become a crucial step for xylooligosaccharides production for food additives and nutraceuticals industries. In this study, xylanase hydrolysis of pretreated hemicellulosic kenaf (Hibiscus cannabinus) for substantial hemicellulose hydrolysis was demonstrated. Experiments were performed primarily to investigate the effect of several critical reaction conditions towards the enzymatic hydrolysis of the pre-treated kenaf. The effects of … …American Journal of Agricultural and Biological Sciences, Vol. 11, Issue 2 · 28 Apr 2016 · 7,819 accessesView PDFCite
Research ArticleOpen accessIn the author namesThe Diaspora Nigerians’ Image Problem of Drug and Fraud: A Case Study of the Malaysian-Indonesian Experience through Newspaper ReportsMusa Yusuf Owoyemi, Abdul Kadir Haji Din, Ahmad Zaharuddin Sani Ahmad SabriIt is no longer news that the economic and social problems in Nigeria have led to mass migration of Nigerians to other parts of the world for better job opportunities and/or education. South-East Asia has had its fair intake of some of these Nigerians especially in recent times. However, some unscrupulous Nigerians in their bid to make quick money have … …Journal of Social Sciences, Vol. 11, Issue 2 · 24 Jun 2015 · 7,767 accessesView PDFCite
Research ArticleOpen accessIn the author namesNecessity of Tutor Training in Architecture Education Using Rasch Measurement ModelBadiossadatHassanpour, Nangkula Utaberta, Azami ZaharimThis is an unwritten norm that says learning can take place in the job. But learning in tutors’ position in the meaning of gaining experience is good but in case of try and error would be crucial. On the other hand there is a belief among practitioners that they assume that who has some experience in architecture is fully equipped … …American Journal of Applied Sciences, Vol. 9, Issue 11 · 12 Sep 2012 · 6,737 accessesView PDFCite
Research ArticleOpen accessIn the author namesThe Role of CO2 Emission in Energy Demand and SupplyMd. Azizul Bari, Joy Jacqueline Pereira, Rawshan Ara Begum et al.Problem statement: During the last few years in Malaysia, the amount of Carbon Dioxide (CO2) released into the atmosphere has been rising extensively. The main source of CO2 is power source of automobile and industry that are contributing the main role for these CO2 emissions. But these sectors are also very important for economic growth and developments. The aim of … …American Journal of Applied Sciences, Vol. 9, Issue 5 · 22 Feb 2012 · 7,063 accessesView PDFCite
Research ArticleOpen accessIn the author namesTechnology Use in the Virtual R&D TeamsNader Ale Ebrahim, Shamsuddin Ahmed, Salwa Hanim Abdul Rashid, Zahari TahaProblem statement: Although, literature proves the importance of the technology role in the effectiveness of virtual Research and Development (R&D) teams for new product development. However, the factors that make technology construct in a virtual R&D team are still ambiguous. The manager of virtual R&D teams for new product development does not know which type of technology should be used. … …American Journal of Engineering and Applied Sciences, Vol. 5, Issue 1 · 31 Jan 2012 · 10,756 accessesView PDFCite
Research ArticleOpen accessIn the author namesOptimization of Energy Dispersive X-Ray Fluorescence Spectrometer to Analyze Heavy Metals in Moss SamplesMohd Zahari Abdullah, Ahmad Saat, Zaini HamzahProblem statement: Mosses had been widely used as bioindicator especially to study the levels of trace metals pollutants in the surrounding ambient air because of their high efficiency to accumulate heavy metals contamination. There had been increasing demand to get a suitable analytical tools to determine the chemical contents of moss samples in this type of media. This study was … …American Journal of Engineering and Applied Sciences, Vol. 4, Issue 3 · 18 Aug 2011 · 7,793 accessesView PDFCite