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Articles by W.R.W. Daud
Total Records ( 3 ) for W.R.W. Daud
  Mustafa Ibrahim , K. Sopian and W.R.W. Daud
  Problem statement: The thin- layer drying experiments were conducted to examine the effect of drying air temperature and humidity on the drying kinetics. Approach: A model to estimate the drying behavior of Lemon grass was developed). Results: Four different thin-layer drying models were compared with respect to their coefficient of determination (R2), Mean Bias Error (MBE) and Root Mean Square Error (RMSE). The one with highest (R2) and lowest (MBE) and (RMSE) was selected to better estimate the drying curves. Three temperatures (35, 45 and 55°C) and three humidities (30, 40 and 50%) were investigated with a fixed air velocity of 1 m sec-1. Conclusion/Recommendation: The increase in the drying air temperature increased the drying process and decreased the Equilibrium Moisture Content (EMC) of Lemon grass. The drying process decreased as the air humidity increases. The effect was less than that of the temperature. The EMC have high values with high relative humidity.
  S.L. Ho , S.K. Kamarudin , W.R.W. Daud and Z. Yaakub
  The design, fabrication and performance evaluation of a passive direct methanol fuel cell (DMFC) operated at ambient condition with an active area of 7.5 cm2 is studied in this research. The fuel cell is air-breathing and passive without any external pumps or auxiliary devices. Oxygen is taken from the surrounding air and methanol is stored in a built-in reservoir at the anode side. It was tested with methanol of various concentrations, ranging from 1 to 5 M. It was found that cell performance improved with higher methanol concentrations. Power density of 3.5 mW cm-2 was achieved with 4 M methanol at a voltage of 0.2 V. This study also presents the performance of the cell tested for different types of design assemble and current collector. The main contribution of this study is the ideas and possibilities in fabrication of micro DMFC in component assemble point of view in order to enhance the power performance and all the possibilities was proofed with data from experiments.
  R. Sari , Z. Yaakob , M. Ismail and W.R.W. Daud
  In this study, the potential of utilizing the porous alumina ceramic membrane coated with palladium as a hydrogen permselective membrane has been studied. The ceramic membrane is characterized by high permeability but at low hydrogen selectivity. In order to increase the pure hydrogen selectivity and to obtain high hydrogen yield on the ceramic membrane, palladium was coated on the alumina membrane surface. Such an arrangement would also enable the ceramic membrane to be operated at higher temperature. The preparation of the palladium coated ceramic membrane was carried out using combine sol-gel process and the electroless plating technique. The effect of combine sol-gel process with electroless plating towards hydrogen permeation and hydrogen permselectivity were analysed. The thickness of the α-Alumina and Palladium composite membranes were analysed using a Scanning Electron Microscopy (SEM). The resulting membrane showed significantly higher hydrogen permeation but the same time decrease hydrogen permeability and permselectivity.
 
 
 
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