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Articles by M. Awang
Total Records ( 7 ) for M. Awang
  Dollaris R. Suhadi , M. Awang , M.N. Hassan , Ramdzani Abdullah and Azizi Hj. Muda
  An analysis of photochemical smog pollution in Jakarta was attempted using data from the existing air quality monitoring stations. Ground-level ozone potential is high in Jakarta due to the high traffic emissions of ozone precursors and the favorable surface meteorological conditions. Despite the frequent missing data during the 1996-1999 monitoring, which resulted in lower ozone values, ozone episodes were significantly recorded in 1997-1998. The number of hours on which ozone concentrations exceed the 1-hour standard (100 ppb) at an ambient station located in Kelapa Gading (10 km northeast of city center) was 186 hrs in 1997 and 571 hrs in 1998. El Niño phenomenon in 1997-1998 had affected the local meteorology leading to more favorable conditions for photochemical production of ozone. The annual ozone averages in ambient stations located off the city center have exceeded the 1-year standard limit (15 ppb). Although the annual average and 95-percentile values indicated an increasing trend from 1996 to 1998, the trend remains to be seen in the future as more complete data could be expected from the new monitoring system. The number of hours on which ozone exceed the 1-hour standard and the annual average tend to be increasing since 2001 to 2002 in all 3 newly operated stations. The seasonal variations of ozone indicate that ozone level is highest in the dry season (September-November) and is lowest in the wet season (December-March). Correlation between ozone level and meteorological attributes (solar radiation, relative humidity and temperature) was significant at 0.01 confidence level. The diurnal cycle of ozone and its precursors is clearly shown and is typical for polluted urban areas. Improvement of the database of air quality monitoring is very critical for Jakarta. Through better database management, the development and monitoring of cost-effective air pollution control strategy can be made.
  M. T.S.M. Said , D. A. Hamid , A. Ismail , S. N.N. Zainal , M. Awang , M. A. Rojan , I. M. Ikram and M. F. Makhtar
  Friction Stir Welding (FSW) is a high reliability solid state joining process that promote energy efficient, versatile and environmental friendly. In this study, experiments were conducted to investigate the effects of FSW welding parameter for different transverse speeds (i.e., 67, 82 and 92 mm min–1) and rotational speeds (i.e., 490, 653 and 910 rpm) on the weld quality of Aluminium Alloy (AA) 5083 T-joint. A customized fixture had been made to clamp 2 pieces of AA5083 and AISI H13 cone with thread tool shape is used as tool pin profiles in this present study. Five samples were successfully prepared and three mechanical tests were carried to validate the specimens such as visual inspection on the surface weld, macro inspection and tensile test. It was found that the suitable welding parameter obtained is rotational speed 910 rpm and transverse speed 92 mm min–1. The specimen produces no defect on the weld surface and cross section as well as obtained highest ultimate tensile strength of 90.33 Mpa.
  C.S. Hassan , P. Hussain and M. Awang
  Finite Element Method (FEM) using ANSYS software was employed to evaluate the residual stress distribution in direct joining of sialon and AISI 430 ferritic stainless steel. The elastic-plastic model and four nodes quadratic element PLANE 42 with axisymmetric option were adopted in the analysis. Results showed that sialon experience compressive stresses in radial direction but tensile in axial direction. On the other hand, stresses in AISI 430 ferritic stainless steel are tensile in radial direction but compressive in axial direction. The highest tensile axial stress appeared at the radial free surface of sialon, very near to the joint interface. It is observed that shear stresses concentrated near and on the joint interface.
  M. Awang , I.M. Ahmat and P. Hussain
  Friction Stir Welding (FSW) is a solid-state joining process where a non-consumable, rotating tool is rotated at a constant speed and fed at a constant traverse rate into the joint line between two pieces of sheet or plate material, which are butted together. Whereas, Friction Stir Spot Welding (FSSW) is a derivative of FSW without lateral movement of the tool during the process. Two plates of aluminum alloy 2011 in the dimension of 10 mm thickness was joint welded by using FSW and 1 mm thickness of Aluminum alloy 1100 sheets was spot welded by using FSSW. The strength of the welds was tested using Universal Tensile Machine and the microstructure evolution was observed using optical microscope. Three different regions of FSW and FSSW welds were characterized whereas the strengths of the FSW and FSSW welds were compared to the parent metal.
  E. Mohammadpour , M. Awang and M.Z. Abdullah
  A finite element simulation technique for estimating the mechanical properties of Single-Walled Carbon Nanotube (SWCNT), polymer composites is developed. In the present modeling work, individual carbon nanotube is simulated as a frame-like structure and the primary bonds between two nearest-neighboring atoms are treated as 3D beam elements. The beam element nonlinear properties are determined via the concept of energy equivalence between molecular dynamics and structural mechanics using Modified Morse potential. Young’s modulus of SWCNTs is estimated to illustrate the accuracy of this simulation technique. Results show that the obtained mechanical properties of nanotubes by the present method are in good agreement with their comparable results.
  M.R. Lias , T.V.V.L.N. Rao , M. Awang and M.A. Khan
  Misalignment in gear dynamics mesh always lead to generate a vibration that causes of un-even dynamic load on transmitting torque to the gear tooth. This type of load is also considered as one of the main criteria on contributing the high stresses happen to the teeth that lead to the fatigue breakage after in some duration of cyclic loading time. This effort of study is made to analyze theoretical forces that create stresses with the effect of axial misalignment to a spur gear in meshing condition. A 3D CAD model of the pinion hobbing gear tooth was created with Autodesk Inventor 2010 and analyzes using ANSYS V13 FEA method. The transmitted dynamic load was calculated with change of misalignment angle proportionally to the theoretical contact area on the tooth face. As a result the stress distribution at the contact region and the tooth root is clearly seen variant with the misalignment angle and the equivalent stress is directly proportional with the misalignment deviation. The values of equivalent stresses and its distribution are change with the changing of deviation angle. The stress concentration is higher at the contact region and the tooth root with augmentation of misalignment angle. The face load factor in align and misalign shows the increasing of the load deviation will cause the factor to increase and probably the major contribution to the vibration of the gear mesh in dynamic condition.
  W.P. Yong and M. Awang
  The Cubic Plus Association (CPA) and the Statistical Associating Fluid Theory (SAFT) are theoretically derived based on perturbation theory using Wertheim theory by considering the effect of hydrogen bonding on thermodynamic properties of associating fluids. These EoS are applied to predict the phase equilibrium of pure water and carbon dioxide system at different temperatures and pressures. A comparison has been made between those EoS and the widely used cubic EoS such as Soave-Redlich Kwong (SRK) and Peng-Robinson (PR) EoS. Satisfactory predictions are obtained for CPA and SAFT EoS and the analysis of results show that these theoretically derived models can successfully predict the pure water and carbon dioxide system even with zero binary interaction parameter.
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