Gautam P.,Tribhuvan University |
Khanal R.,Tribhuvan University |
Saw S.H.,Nilai University |
Saw S.H.,Australian Institute for Plasma Focus Studies |
Lee S.,Australian Institute for Plasma Focus Studies
IEEE Transactions on Plasma Science | Year: 2017
Measured current waveforms at different neon pressures from two different plasma focus (PF) devices, namely, NX2 and NX1 are used for analysis using the Lee code. The model parameters of mass (fm and fmr) and current (fc and fcr) in axial and radial phase, respectively, are obtained by fitting the computed current waveform to the measured current waveform for each pressure over a range of pressures in neon. The results show that the value of fm and fmr ranges from 0.07 to 0.12 and 0.09 to 0.20, respectively, over the pressure range 1.0-5.0 Torr for NX2, whereas for NX1 it ranges from 0.020 to 0.024 and 0.048 to 0.08, respectively, over the pressure range 7.5-12 Torr. In all cases, the values of fc and fcr are fixed at 0.7. Comparison of computed and measured soft X-ray (SXR) yield using fit model parameters for both devices shows good agreement. An important finding is that despite the noticeable variation of mass factors over the whole pressure range, a representative set of model parameters is found for each machine which may be taken as fixed over the range of pressures producing a good yield. In particular, for a high-performance PF using conventional electrode structure the representative set is: fm = 0.075, fc = 0.7, fmr =0.1, and fcr= 0.7. This is valuable information for neon SXR design purposes. IEEE
Tan Jian Wei N.,Nilai University |
Jian Nan W.,Nilai University |
Guiping C.,Nilai University
IOP Conference Series: Materials Science and Engineering | Year: 2017
The dependence of efficiency of photovoltaic panels on their temperature during operation is a major concern for developers and users. In this paper, a phase change material (PCM) cooling system was designed for a 60W mono-crystalline solar panel. Tealights candle was selected as the cooling medium. The solar irradiance was recorded using Kipp & Zonen CMP3 pyranometer and Meteon data logger. Temperature distribution on the surface of solar panel, output voltage and output current of solar panel were measured. The average irradiance throughout data collection was found to be 705W/m2 and highest irradiance was 1100 W/m2. The average solar panel temperature was 43.6°C and a maximum temperature of 53°C was at the center of solar panel. Results showed that average power output and efficiency of the solar panel were 44.4W and 15%, respectively. It was found that the higher the solar irradiance, the lower the efficiency of solar panel and the higher the temperature and power output of solar panel. This is due to the fact that high irradiance results in high power input and high solar panel temperature. But high PV panel temperature reduces its power output. Therefore, the increase of power input outweighs that of power output, which leads to the decrease of efficiency of solar panel with the increase of solar irradiance. Compared with solar panel without cooling, the power output and efficiency of solar panel did not increase with PCM cooling. It indicates that Tealights candle as PCM cooling is not efficient in improving the efficiency of solar panel in this study. © Published under licence by IOP Publishing Ltd.
Nagentrau M.,University Tun Hussein Onn Malaysia |
Tobi A.L.M.,University Tun Hussein Onn Malaysia |
Kamdi Z.,University Tun Hussein Onn Malaysia |
Ismail M.I.,University Tun Hussein Onn Malaysia |
Sambu M.,Nilai University
Journal of Failure Analysis and Prevention | Year: 2017
This paper addresses wear failure analysis of tungsten carbide (WC) hardfacing on a carbon steel blade known as the continuous digester blade (CD blade). The CD blade was placed in a digester tank to mix ilmenite ore with sulphuric acid as part of a production process. Tungsten carbide hardfacing was applied on the CD blade to improve its wear resistance while the CD blade was exposed to an abrasive and acidic environment. Failure analysis was carried out on the hardfaced CD blade in order to improve its wear resistance and lifetime. A thickness and hardness comparison study was conducted on worn and unworn specimens from the CD blades. The carbide distribution along with elemental composition analysis of the hardfaced CD blade specimens was examined using scanning electron microscopy and energy-dispersive spectroscopy. The investigation revealed that an inconsistent hardfacing thickness was welded around the CD blade. Minimum coating thickness was found at the edges of the blade surfaces causing failure to the blades as the bare carbon steel blades were exposed to the mixed environment. The wear resistance of the CD blade can be improved by distributing the carbide uniformly on the hardfaced coating. Applying extra coating coverage at the critical edge will prevent the exposure of bare carbon steel blade, thus increasing the CD blade lifetime. © 2017 ASM International
Kumar Yogeesh D.,Nilai University |
Chandrasekaran M.,Vels University |
Eriki Ananda K.,Caledonian College of Engineering |
Reddy J.,Jawaharlal Nehru Technological University Anantapur
ARPN Journal of Engineering and Applied Sciences | Year: 2016
In this paper, optimize the vibrational analysis of power train by decoupling method in the field of automotive. Power train (Engine and gear box) is typically connected to the chassis by three or four rubber mounts. Ideal engine mounts should isolate engine vibrations caused by engine disturbances in the engine speed range and prevent large engine movement from shock excitations from vehicle accelerations, braking and road undulations. The design of power train/mount system involves selection of stiffness coefficients, location and orientation of the individual rubber mounts. Rubber mount location and orientation is decided by designer based on packaging constraints. The goal in this project is to find the engine mount stiffness values corresponding to natural frequencies and mode shapes of the power train system/mount system. CAE find stiffness values and coordinates corresponding to natural frequencies by optimization. © 2006-2016 Asian Research Publishing Network (ARPN).
Lau C.Y.,Nilai University |
Ang W.L.,INTI International University
Advanced Science Letters | Year: 2016
This article investigates the on-going issue that is associated with China’s String of Pearls (SOP) strategy in South China Sea which has trespassed on Malaysia’s water territories, analyzed from the perspectives of military costs, international business trade relation, and natural resources acquisition as well as its possible impact on Malaysia’s position in South China Sea using the game theory. China’s vision is to expand its seaborne trading route strategy to secure its commodity and energy transaction by mobilizing the sea channel ’silk road’, otherwise also known as the String of Pearls strategy. Each ‘pearl’ plays a unique, different role in different location for its mixed strategy in the international trading area especially in the Spratly Islands. Currently, China has been aggressive in the South China Sea by provoking Vietnam, the Philippines, and Malaysia. Therefore, international trade relation between China and Malaysia is questionable. However, Malaysia’s ‘status quo’ strategy that is analyzed and reflected in the game theory may be adopted as the possible solution to this pertinent issue, paving the way for Malaysia to also serve as a role model within the ASEAN region to end the conflict and gain sustainable economic growth. © 2016 American Scientific Publishers. All rights reserved.
Eriki A.K.,Nilai University |
Rao K.P.,Jawaharlal Nehru Technological University Anantapur |
Varaprasad K.C.,Sri Venkateswara University
Applied Mechanics and Materials | Year: 2014
Titanium has been perceived as a material that is difficult to machine. Manufacturers are known that, with proper procedures, titanium can be fabricated using techniques no more difficult than those used for machining SS316. The machining of hard workpiece materials requires significantly harder cutting materials. Advancements in the aerospace, nuclear and other industries require the enhanced in-service performance of engineering components. These requirements have resulted in a large scale development and use of heat-resistant and high-strength materials, such as Ti6A4Valloys, which pose considerable machining problems. In this analysis on machining of titanium alloy using cubic boron nitride (cBN) tools, the machining performance was evaluated in terms of cutting force, specific cutting pressure, cutting temperature, chip strain and surface finish. The studies of turning machinability of titanium alloy using round tee-lock cubic boron nitride (cBN) inserts have been presented. A series of turning experiments were performed with cubic boron nitride (cBN) inserts with the objective: To determining the effect of cutting variable on the tool life. To investigate the effect of cutting speed and feed rate on the surface roughness while using round tee - lock inserts. A good surface finish of 0.5 to 1 micron was obtained for cutting speed between 15 - 45 m/min, feed of 0.10 to 0.20 mm/rev and depth of cut of 1 mm and also find the stress intensity in two different axis will be studied. © (2014) Trans Tech Publications, Switzerland.
Shahabuddin N.S.,Nilai University |
Bakar R.A.,Nilai University
Proceedings of the 2015 International Conference on Automation, Cognitive Science, Optics, Micro Electro-Mechanical System, and Information Technology, ICACOMIT 2015 | Year: 2015
A multiwavelength fiber ring laser is demonstrated using a nonlinear polarization rotation (NPR) effect. An isolator and a photonic crystal fiber are incorporated in an Erbium doped fiber laser (EDFL) to generate intensity-dependent transmission induced by the NPR effect which allows the multiwavelength generation at room temperature. A stable 17 lasing lines in 1560 nm region are generated. The multiwavelength Erbium doped fiber laser (EDFL) exhibits spacing of 0.27 nm. EDF pump power was varied from 30 mW to 120 mW. Higher Erbium doped fiber (EDF) pump power generally leads to more multiwavelength generation at the expense of lower SNR due to higher noise level. © 2015 IEEE.
Yee W.,Nilai University
World Journal of Microbiology and Biotechnology | Year: 2016
Over the years, microalgae have been identified to be a potential source of commercially important products such as pigments, polysaccharides, polyunsaturated fatty acids and in particular, biofuels. Current demands for sustainable fuel sources and bioproducts has led to an extensive search for promising strains of microalgae for large scale cultivation. Prospective strains identified for these purposes were among others, mainly from the genera Hematococcus, Dunaliella, Botryococcus, Chlorella, Scenedesmus and Nannochloropsis. Recently, microalgae from the Selenastraceae emerged as potential candidates for biodiesel production. Strains from the Selenastraceae such as Monoraphidium sp. FXY-10, M. contortum SAG 47.80, Ankistrodesmus sp. SP2-15 and M. minutum were high biomass and lipid producers when cultivated under optimal conditions. A number of Selenastraceae strains were also reported to be suitable for cultivation in wastewater. This review highlights recent reports on potential strains from the Selenastraceae for biodiesel production and contrasts their biomass productivity, lipid productivity as well as fatty acid profile. Cultivation strategies employed to enhance their biomass and lipid productivity as well as to reduce feedstock cost are also discussed in this paper. © 2016, Springer Science+Business Media Dordrecht.
Logeswaran R.,Nilai University
IEEE ICSIPA 2013 - IEEE International Conference on Signal and Image Processing Applications | Year: 2013
Selamat Datang (Welcome!) to the 2013 IEEE International Conference on Signal and Image Processing Applications or more fondly known as IEEE ICSIPA 2013. As the 3rd in the series, this flagship conference of the IEEE Signal Processing Society (Malaysia) (awarded Best Signal Processing Chapter 2011) has a good reputation for quality and a forum for valuable exchange of knowledge. It gains participation of esteemed researchers from both the local and international arena. This year, 169 papers were submitted by authors from various countries, with the majority being international authors. Of these, about 48% the papers were accepted and are to be presented at the conference. © 2013 IEEE.
Zaharinie T.,University of Malaya |
Huda Z.,Nilai University |
Izuan M.F.,University of Malaya |
Hamdi M.,University of Malaya
Applied Surface Science | Year: 2015
Abstract Brazing experiments on commercially-pure copper plates, using brazing filler metal (MBF-2005), are conducted at temperatures in the range of 650-750 °C for time-durations in the range of 5-15 min. Shear tests for braze-joints involved use of a universal testing machine. Based on the shear-test results, a new brazing cycle has been developed that corresponds to the greatest shear strength of the braze-joint. The brazing cycle has been performed under a controlled dry-argon atmosphere in a tube furnace. Microscopic observations were made by use of both optical and electron microscopes; whereas surface roughness measurements were made by using a TR100 Surface Roughness Tester. It is found that successful brazing and good wetting can be achieved by the least voids by using an average surface roughness (Ra value) for the base material. © 2015 Elsevier B.V. All rights reserved.