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Kenyataan Akhbar Kementerian Kesihatan Malaysia : Situasi semasa jangkitan penyakit Coronavirus 2019 (Covid-19) di Malaysia 24 April 2022
No full textThis item is made available on Ministry of Health Malaysia, Covid-19 homepage at http://covid-19.moh.gov.my
Kenyataan Media Kementerian Kesihatan Malaysia : Situasi semasa jangkitan penyakit Coronavirus 2019 (Covid-19) di Malaysia 11 Mac 2022
No full textThis item is made available on Ministry of Health Malaysia, Covid-19 homepage at http://covid-19.moh.gov.my
Transient thermal analysis on convection process of circular plate used in hot surface deposition test rig
Get PDFLink to publisher's homepage at http://ijneam.unimap.edu.myThe purpose of this study is to investigate the transient thermal behavior of the convection
process of a circular-shaped aluminum alloy plate used in the Hot Surface Deposition Test
(HSDT) rig. The temperature distribution and its characteristics over time are investigated
by applying certain thermal load and time dependence. As the real deposition test using
HSDT involves a process of detaching the aluminum alloy circular plate from the heater
block, the transient thermal analysis will provide a base for estimating the time required for
the hot plate to cool down to room temperature (25°C-27°C) and safe to be handled. The
process of modeling the geometry, meshing, applying the boundary conditions, and
evaluating results are conducted experimentally using ANSYS Release 16.2 software. It is
indicated in the analysis results that the aluminum alloy circular plate with higher internal
temperature undergoes a longer convection process to cool down to room temperature.
These results are used to estimate the cooling down time of the hot plate in the real
deposition test
Academic writing course evaluation: perspective of engineering students
Get PDFLink to publisher's homepage at http://ijneam.unimap.edu.myEngineering education has now put emphasis on writing skills that is considered equally
important in shaping competent engineers. Academic Writing as an English for Specific
Purposes (ESP) course equips students with essential writing skills for engineering academic
and professional tasks. This study is undertaken with the aim to investigate the strengths
and weaknesses of the current Academic Writing course offered at a technical university.
The findings are crucial for the course's continuous improvement. This paper will report
quantitative data through the questionnaire method employed that involves the feedback of
100 enrolled students. It comprises four dimensions namely course contents, materials and
resources, testing and assessment, and academic instruction. The results reveal some
constructive feedback from students that includes the need to improve in course materials
and resources due to lack of study materials, as well as a call for the academic instruction
by instructors to be improved. Suggestions and recommendations are made in order to
contribute to continuous quality improvement for the course
The impact of working gas on heat transfer performance of tube banks heat exchanger in a thermoacoustic system
Get PDFLink to publisher's homepage at http://ijneam.unimap.edu.myThermoacoustic system is a system introduced as an alternative technology for refrigerators
or heat engine because it uses environmentally friendly gases as a working medium.
Thermoacoustic system usually uses noble gaseous as working medium and air has been
widely used since it is available abundantly and easy to handle when performing experiment.
Other than air, helium is also frequently used in thermoacoustic system because its low
Prandtl number is expected to improve the performance of thermoacoustic system. This
paper reports the computational results of heat transfer performance across tube banks
heat exchanger when air and helium are used in thermoacoustic environment. The transient
cases of thermoacoustics were solved using the Shear-Stress-Transport k-ω turbulence
model. The model was first validated with experimental results with air as the working fluid.
The validated model was then solved for helium. Results showed that helium offers higher
Nusselt number (6.52%) and Colburn-j factor (11.25%) compared to air at lower Reynolds
number. Hence, the study suggests that the use of helium gas is favorable if better heat
transfer is to be achieved in thermoacoustic energy system
The effect of porous materials on temperature drop in a standing wave thermoacoustic cooler
Get PDFLink to publisher's homepage at http://ijneam.unimap.edu.myThermoacoustics is a principle of sciences that offers an alternative solution for cooling system with a technology that is green and sustainable. The thermoacoustic energy conversion takes place mostly within the area of the porous structure that forms the core of the system. In this study, the effect of changing the material of the porous structure on the
performance of the thermoacoustic refrigerating system is reported. Experiments were performed under standing wave environment with two different resonance frequencies with air at atmospheric pressure. The porous stack was chosen to be with three different materials of polycarbonate, ceramic and stainless steel. The results show that the use of ceramic celcor as the porous material provides the biggest temperature difference which means that thermoacoustic performance is better. The performance is even better when the system is working with higher resonance frequency. At atmospheric pressure condition with
air as working medium, the thermoacoustic cooler with ceramic porous material is capable of producing temperature difference of 39.16C when operating at a frequency of 202.1 Hz
Design and electrical simulation of a 22nm MOSFET with graphene bilayer channel using Double High-ĸ Metal Gate
Get PDFLink to publisher's homepage at http://ijneam.unimap.edu.myThis paper will discuss the virtual fabrication design process of a 22nm MOSFET bilayer graphene with high-ĸ metal gate (HKMG). Silvaco software's TCAD fabrication tools were utilized, with the Athena simulation module used to construct the device design and the Atlas module used to describe the device's electrical characteristics. To get the electrical characterization of a transistor specified by international standards, fixed field scaling methods were employed. Advanced and new methods were used to reduce the problems that occur during the manufacture of nano-sized transistors while increasing their performance. The material is Titanium dioxide (TiO2), while the metal gate is Tungsten Silicide (WSiX). The simulated devices conform to the International Technology Roadmap Semiconductor (ITRS) specifications. The results show that Vth is 0.206 ± 12.7% V for high performance (HP) logic technology requirements