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Articles by M. Mohamad
Total Records ( 4 ) for M. Mohamad
  M. Mohamad , F. Mustafa , A.M. Hashim , S.F. Abd Rahman , A.A. Aziz and Md. R. Hashim
  In this study, Pt-circular Schottky diode is successfully fabricated for gas sensor application. The fabricated Schottky diode shows good rectification characteristics. The device which shows improvement in term of wiring connection for electrical characterization is fabricated. The DC I-V curves of fabricated Schottky diodes show low series resistance of 210 Ω and 330 Ω. The Schottky barrier height (SBH) in the range of 0.458-0.708 eV are experimentally obtained and the discrepancy with the calculated SBH is discussed. A measurement setup that has a capability to allow measurement at high temperature, high hydrogen gas density and low vacuum pressure is also presented. The fabricated device is expected to be suitable for gas sensing application.
  M. Mohamad , M.W. Ali and A. Ahmad
  A mass transfer model of major phytochemical components from Eurycoma longifolia was developed in order to describe the solid-liquid extraction process. The yield of the extraction normally depends on the operating parameters such as solvent to raw material ratio, extraction time, temperature and agitation speed. In this study, the model was developed taking into account the two-way mass transfer of solute into liquid phase and the solvent into solid system. The influence of processing variables such as extraction temperature, solvent to raw material ratio and agitation speed was simulated by the model. Several assumptions were made in the theoretical approach to solve the simulation algorithm in order to predict the performance of the solid-liquid extraction system. From the study, it can be concluded that when the extraction temperature was increased, the yield of extraction also increased and this has reduced the extraction time. The best agitation speed was found to be at 400 rpm.
  G. Adiana , B. Joseph , N.A.M. Shazili , M. Mohamad and H. Juahir
  A research expedition was carried out off the Borneo Island coastal in order to define the current level and behavior of metals in the water column of Sulu and Celebes Seas. Water samples were collected at 37 stations off Sabah and Sarawak coasts. Samples were then pre-concentrated using Chelex-100 resin, preserved on-board ship prior transportation to the laboratory and finally, analyzed using Inductively Coupled Plasma Mass Spectrometry (ICP-MS). Overall, the vertical profiling of metals showed no distinctive patterns. In the meantime, the Principal Component Analysis (PCA) showed a group of bioactive metals and abundance metals in the upper continental crust. Additionally, PCA showed the decrease in of temperature and salinity led to increase of Dissolved Oxygen (DO) in depth. Besides that, the elements partitioning exhibits that Chromium (Cr), Nickel (Ni), iron (Fe) and lead (Pb) has the strongest adsorption onto Suspended Particulate Matter (SPM) whereas Cadmium (Cd), Zinc (Zn) and Aluminium (Al) showed the weakest bond with SPM. In brief, data collected throughout the present research has evidence the influenced of land-based contaminants into the water column as well as the physico-chemical characteristics of Sulu and Celebes Seas off Malaysian waters.
  A.G. Madaki , M. Abdulhameed , M. Mohamad , M. Ali and R. Roslan
  The two-dimensional steady boundary layer flow of a nanofluid past a stretching sheet with a convective boundary condition in the presence of chemical reaction has been studied. The equation of volume fraction concentration consists of the Brownian motion and the thermophoresis effects. The governing equations are simplified via. boundary value approximation and some similarity variables and solved using the Runge-Kutta fourth order method with shooting technique and Homotopy Perturbation Method (HPM) with Pade approximation (HPM-Pade). All the salient parameters on the temperature and concentration profiles have been studied and details are given graphically. Thus, the results found in this study are being compared with the previously published study where an excellent agreement is achieved. As presented on tables. It is found that the reduced Nusselt number is a decreasing function of both generative and destructive chemical reaction γ. While the reduced Sherwood number is a decreasing function when chemical reaction parameter, γ<0 and increases when γ>0.
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