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Kampung Baharu Nilai, Malaysia

Mohamad Nor N.,Multimedia University | Yunus S.,Multimedia University | Trlep M.,University of Maribor | Othman M.,Universiti Sains Islam Malaysia | And 3 more authors.
International Journal of Electrical Power and Energy Systems | Year: 2014

This paper investigates the effects of current magnitudes, steady-stage earth resistances, RDC, and threshold electric field, Ec on the characteristics of earthing systems under impulse conditions by using Finite Element Method (FEM). It has been reported in literature that there are three scenarios that can occur when the earthing systems are subjected under high impulse conditions as compared to its steady-state conditions, namely; (i) no difference in its resistance values between steady-state and impulse conditions, (ii) earth resistances under impulse were found to be lower than that at steady-state, and (iii) earth resistances were found to be higher under impulse than that at steady-state. It was found that the largest reduction in impulse resistance occurred for the earth resistance with the highest values for different factors; current magnitudes and Ec. © 2014 Published by Elsevier Ltd. All rights reserved.

Huda Z.,Nilai University | Zaharinie T.,University of Malaya | Metselaar I.H.S.C.,University of Malaya | Ibrahim S.,University of Malaya | Min G.J.,University of Malaya
Archives of Metallurgy and Materials | Year: 2014

The Haynes® 718 Ni-base superalloy has been investigated by use of modern material characterization, metallographic and heat treatment equipment. Grain growth annealing experiments at temperatures in the range of 1050-1200°C (1323-1473K) for time durations in the range of 20 min-22h have been conducted. The kinetic equations and an Arrhenius-type equation have been applied to compute the grain-growth exponent n and the activation energy for grain growth, Q8, for the investigated alloy. The grain growth exponent, n, was computed to be in the range of 0.066-0.206; and the n values have been critically discussed in relation to the literature. The activation energy for grain growth, Q8, for the investigated alloy has been computed to be around 440 kJ/mol; and the Q8 data for the investigated alloy has been compared with other metals and alloys and ceramics; and critically analyzed in relation to our results.

Logeswaran R.,Nilai University
IEEE ICSIPA 2013 - IEEE International Conference on Signal and Image Processing Applications | Year: 2013

Selamat Datang (Welcome!) to the 2013 IEEE International Conference on Signal and Image Processing Applications or more fondly known as IEEE ICSIPA 2013. As the 3rd in the series, this flagship conference of the IEEE Signal Processing Society (Malaysia) (awarded Best Signal Processing Chapter 2011) has a good reputation for quality and a forum for valuable exchange of knowledge. It gains participation of esteemed researchers from both the local and international arena. This year, 169 papers were submitted by authors from various countries, with the majority being international authors. Of these, about 48% the papers were accepted and are to be presented at the conference. © 2013 IEEE.

Zaharinie T.,University of Malaya | Huda Z.,Nilai University | Izuan M.F.,University of Malaya | Hamdi M.,University of Malaya
Applied Surface Science | Year: 2015

Abstract Brazing experiments on commercially-pure copper plates, using brazing filler metal (MBF-2005), are conducted at temperatures in the range of 650-750 °C for time-durations in the range of 5-15 min. Shear tests for braze-joints involved use of a universal testing machine. Based on the shear-test results, a new brazing cycle has been developed that corresponds to the greatest shear strength of the braze-joint. The brazing cycle has been performed under a controlled dry-argon atmosphere in a tube furnace. Microscopic observations were made by use of both optical and electron microscopes; whereas surface roughness measurements were made by using a TR100 Surface Roughness Tester. It is found that successful brazing and good wetting can be achieved by the least voids by using an average surface roughness (Ra value) for the base material. © 2015 Elsevier B.V. All rights reserved.

Zainuddin A.,University Putra Malaysia | Adam N.M.,University Putra Malaysia | Rusli I.H.,Nilai University | Kwong Q.J.,University Putra Malaysia
Applied Mechanics and Materials | Year: 2014

This paper studies the current thermal comfort condition of an air-conditioned cafeteria based on objective measurements and computational fluid dynamics (CFD) modeling. Indoor comfort parameters such as temperature and airflow rate were simulated by a CFD tool. The results from field measurements and predicted values were then compared and contrasted. A simulated model that has the same geometrical configuration as the cafeteria was set as a benchmark model. Several additional models with different configuration of cafeteria layouts were proposed to achieve the required air temperature. It was found that the predicted results from the proposed models showed even distributions of airflow characteristics and temperature gradients. To maintain a thermally-acceptable air temperature of 28 °C, it is proposed that an additional air-conditioning unit be retrofitted to the current cafeteria layout. © (2014) Trans Tech Publications, Switzerland.

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