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Tribological Performance of Aluminium Metal Matrix Hybrid Composites
MAPAN - Tập 37 - Trang 845-858 - 2022
The present work investigates the tribological wear characteristics (pin-on-disc) of Al6061composite that has been fabricated via stir casting route of liquid metallurgy technique with varying content of aluminium oxide(Al2O3), zirconia sand (ZrSiO4), silicon carbide (SiC) and rice husk ash (RHA) as reinforcement. The test observations can be observed and appreciated that increasing the reinforcem......
Attenuation Scale Calibration of an Optical Time Domain Reflectometer Using an External Laser Source
MAPAN - - 2018
Optical time domain reflectometers (OTDRs) are widely used to measure the attenuation of optical fibers. Accurate measurement of the attenuation requires periodic calibration of OTDRs. In this paper, a system is proposed based on the external source method (ESM) to calibrate of the attenuation scale of an OTDR over a dynamic range of around 15 dB. The ESM method has several advantages over the wid......
Developing a Computer Based Audiometer for Hearing Loss Screening
MAPAN - Tập 27 - Trang 205-212 - 2013
Audiometric test is an ongoing task in almost all human activities. It presents a fundamental demand related to safety and health. Due to that, there is a need for sophisticated instrument to measure accurately the hearing loss within the human activities, especially for the people who work in noisy fields. The objective of this work is to develop the hearing loss screening system by involving the......
Fabrication of Exhaust Fan Cum Micro Wind Turbine and Its Performance Analysis in High-Rise Building Window
MAPAN - - 2024
As a consequence of the exponential increase in energy usage within urban areas, rooftop micro wind turbines have surfaced as a potent method to supply sustainable energy while also strategically mitigating the environmental impact of carbon emissions. However, significant knowledge gaps exist regarding how to install a rooftop micro wind turbine in conjunction with an exhaust fan in a tall buildi......
A Comparative Study for Material Selection of Sensor Element Using Analytic Hierarchy Process
MAPAN - Tập 33 - Trang 459-468 - 2018
Material selection is crucial for sensor elements. Because of the numerous material alternatives available in the market, systematic methods must be employed to select the most suitable sensor material that satisfies technical, metrological and economic criteria. In this study, analytic hierarchy process (AHP) is employed for the selection of sensor material. Twenty common materials are classified......
A Method of De-noise and Harmonics Detection in Power System Based on Periodicity Analysis
MAPAN - Tập 33 - Trang 169-177 - 2018
A novel method of de-noise and harmonics detection is presented. Firstly, based on periodicity analysis and signals which have been detected, one minimum period signal with slight noise could be calculated. This signal is named as Standard unit-Period (SuP). Then a correction model is constructed based on SuP and 3-sigma rule, aiming to revise the rough harmonic signal. From the view of solutions,......
A Geometric Approach to Beam Type Load Cell Response for Fast Weighing
MAPAN - Tập 31 - Trang 153-158 - 2016
We propose a novel geometric approach to processing of load cell signals for inline weight measurement applications. These systems usually rely on oscillatory load cell signals which always need to time to settle. We describe the theoretical and experimental implementation of a newly proposed geometric approach for load cell signals, and verify the effectiveness of the method through experiments.
Validation of New ITU-R Rain Attenuation Prediction Model over Malaysia Equatorial Region
MAPAN - Tập 34 - Trang 71-77 - 2018
Attenuation due to rainfall is one of the most fundamental constraints on the performance of satellite links above 10 GHz. This work presents the results of rain attenuation measurement using radar data collected from MMD and DIDM, Malaysia. The results were compared with newly improved ITU-R P530-16 and four other selected tropical rain attenuation prediction models. The statistical analysis show......
Conversion of current transformer errors at unity power factor burden, to 0.8 power factor-equivalent
MAPAN - Tập 24 - Trang 3-8 - 2009
The paper contains a full derivation of formulas that enable the conversion of current transformer errors measured at unity power factor burden to equivalent errors at 0.8 power factor lagging burden, required by IEC 60044-1, as well as errors at any other burden. The assumptions and limits of the formulas are discussed.
A Sensor Network to Monitor Process Parameters of Fermentation and Drying in Black Tea Production
MAPAN - Tập 30 - Trang 211-219 - 2015
Fermentation and drying process in tea production are two important processes which play a crucial role in producing good quality tea. Tea colour and flavour are formed in the fermentation and enzyme reactions are terminated and moisture contents are reduced from the leaf particles in the drying process. Ambient temperature and relative humidity (RH) are two major factors for the fermentation proc......
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