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Articles by A. Zaharim
Total Records ( 6 ) for A. Zaharim
  N.M. Tawil , A. Zaharim , I. Shaari , N.A. Ismail , Z.M. Nopiah and H. Othman
  This study discusses a study on e-Learning as an alternative mode for teaching mathematics for engineering students, focusing on vector calculus as an instance of application. Mastery of mathematics is vital for engineering students. A strong foundation in mathematics is necessary to ensure engineering students mastery of other engineering courses. Difficulties in mastering mathematics often adversely affect the achievement of enginering students academically. Among the mathematics courses, vector calculus stand out as challenging to many students. This study thus covers the strategy of this alternativemode to enable students comprehension and mastery of the vector calculus. Implementation of e-Learning is supported by learning softwares, maths websites, Wiley-Plus® and Hot Potatoes®. The e-Learning mode enabled students to communicate with the lecturer at any time through an interactive facebook. Similarly, the use of wordpress and google.doc enabled students to communicate or access learning materials at any time. Evidently, the method has enabled students to master vector calculus and engineering mathematics, through visualization enabled by the e-Learning tools.
  S. Abdullah , M. D. Ibrahim , Z. Mohd Nopiah and A. Zaharim
  This study presents the description of fatigue damage in the context of the statistical process control paradigm. The quality control approach that was used in the analysis was needed in order meet the requirements as well as improving the fatigue damage caused by variable amplitude loading. The methodology discussed in this study is enabling to reduce variability with the specification limits at three standard deviations on both side of the mean value. This concept was used to comparing three ARIMA models that have been previously found based on potential capability value (Cp) and Mean Squared Deviation (MSD). The assumption was made when the process reached the upper and the lower control limits in term of reducing the variability that was described by a variable amplitude fatigue loading. A successive three-sigma concept was then applied and developed on to this type of loading and it purpose was to detect the variation. Finally, it is suggested that the three-sigma concept provided a good platform for analyzing the fatigue damage in the aspect of the durability assessment.
  F. Salehuddin , I. Ahmad , F.A. Hamid and A. Zaharim
  This study reports on an investigation of the effect and optimization of process parameter variability on poly sheet resistance (RS) and leakage current (ILeak) in 45 nm PMOS device. The experimental studies were conducted under varying four process parameters, namely Halo implantation, Source/Drain Implantation, Oxide Growth Temperature and Silicide Anneal Temperature. Taguchi Method was used to determine the settings of process parameters. The level of importance of the process parameters on the poly sheet resistance and leakage current were determined by using Analysis of Variance (ANOVA). Virtual fabrication of the devices was performed by using ATHENA module. While the electrical characterization of the devices was implemented by using ATLAS module. The optimum process parameter combination was obtained by using the analysis of Signal-to-Noise (S/N) ratio. The confirmation tests indicated that it is possible to decrease the poly sheet resistance and leakage current significantly by using the Taguchi method. The results show that the RS and ILeak after optimizations approaches are 67.53 Ω sq-1 and 0.1850 m A μm-1, respectively. In this study, S/D implantation was identified as one of the process parameters that has the strongest effect on the response characteristics.
  N.M. Tawil , A. Zaharim , I. Shaari , N.A. Ismail and M.A. Embi
  These days, e-Learning has become an educational technique due to its influential force in higher education. The convergence of Information and Communication Technology (ICT) provides powerful tools to introduce new educational technologies as well as the usage of online applications. Engineering students normally have problems with Engineering Mathematics which later will affect in other engineering subject. The objective of this study is to measure the importance level of e-Learning in the enhancement of one Mathematics Engineering course is Ordinary Differential Equations (ODE) among four main races in Malaysia. A questionnaire was distributed to all 2nd year students in 4 departments of the Faculty of Engineering and Built Environment, UKM. This study presents the results of a research project aimed at uncovering evidence that students perceived the importance of e-Learning in understanding ODE regardless of their race. The Chinese students show the lowest level of the perceived importance of e-Learning followed by Malay and Indian students. The other race students show the highest level of perceived importance of e-Learning. This study also provides a suggestion to improve the usage of e-Learning and the perception of the importance of e-Learning among Chinese, Malay and Indian students.
  W.M. Alalayah , M.S. Kalil , A.A.H. Kadhum , J. Jahim , A. Zaharim , N.M. Alauj and A. El-Shafie
  Box-Wilson Design (BWD) model was applied to determine the optimum values of influencing parameters in anaerobic fermentation to produce hydrogen using Clostridium saccharoperbutylacetonicum N1-4 (ATCC 13564). The main focus of the study was to find the optimal relationship between the hydrogen yield and three variables including initial substrate concentration, initial medium pH and reaction temperature. Microbial growth kinetic parameters for hydrogen production under anaerobic conditions were determined using the Monod model with incorporation of a substrate inhibition term. The values of μmax (maximum specific growth rate) and Ks (saturation constant) were 0.398 h-1 and 5.509 g L-1, respectively, using glucose as the substrate. The experimental substrate and biomass-concentration profiles were in good agreement with those obtained by the kinetic-model predictions. By varying the conditions of the initial substrate concentration (1-40 g L-1), reaction temperature (25-40°C) and initial medium pH (4-8), the model predicted a maximum hydrogen yield of 3.24 mol H2 (mol glucose)-1. The experimental data collected utilising this design was successfully fitted to a second-order polynomial model. An optimum operating condition of 10 g L-1 initial substrate concentration, 37°C reaction temperature and 6.0±0.2 initial medium pH gave 80% of the predicted maximum yield of hydrogen where as the experimental yield obtained in this study was 77.75% exhibiting a close accuracy between estimated and experimental values. This is the first report to predict bio-hydrogen yield by applying Box-Wilson Design in anaerobic fermentation while optimizing the effects of environmental factors prevailing there by investigating the effects of environmental factors.
  A.A. Azrilah , A. Nazlinda , M. Mohd Saidfudin and A. Zaharim
  It has come to the attention of physics instructors that the engineering students enrolled in Malaysian universities do not possess sound conceptual understanding in basic electricity. Preconceptions and misconceptions regarding this subject matter especially on the topic of parallel resistors have been seen to exist amongst aspiring engineering degree students. Ironically, to date there are not many effective measures taken to arrest this issue. In addition, the existence of appropriate instruments within the local mainstream to measure these students’ conceptual understanding of the related topic of parallel resistors is insufficient. Among the few claimed instrument was designed by Beh has been used to assess the students’ conceptual understanding which has revealed some significant findings and led to some suggestions for the improvement of the current electricity syllabus and teaching instructional methods. However, recent developments within the Malaysian Institution of Higher Learning in science education system, call for a re-validation and improved measurement instrument. The aim of this research is to investigate the validity of this instrument, PCCUT_40-Parallel Resistive Circuit test using Rasch analysis in measuring the conceptual understanding of engineering students in institutions of higher learning in Malaysia on the topic of parallel resistors. The methods used are by purposive sampling on recently enrolled engineering students. The instrument focused on the six main domains which are “the meaning of parallel”, practical knowledge of “current”, “voltage”, “resistance”, followed by “circuit connection” and finally “the mental model”. Data collected were analyzed using WINSTEPS version The result shows that the instrument has ‘excellent’ item reliability of 0.94 logit, SE 0.33 and ‘good’ item separation of 3.82 logit, SE 0.30. Quality control procedures have resulted in an item reduction from 40 to only 28 items, thereby producing a better instrument in measuring the students’ conceptual understanding of parallel resistors, the new PCCUT_28.
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