UTHM

Johor Bahru, Malaysia
Johor Bahru, Malaysia

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Railtrack ballast is a component in the track's substructure. It plays the important role of transmitting and distributing the wheel load to the deeper track section, i.e. subgrade. The cause of ballast breakage is often due to repeated impact by the passing trains. Mostly the breakage occurs at the sharp corners of ballast. Oil contamination can also contribute to track deterioration. In this manner, caused by fuel leaking from the rolling stock and maintenance works of trains. Therefore, it results in shear strength reduction of the ballast layer as the ballast loose frictional resistance due to the oil contamination. In this study, the test results indicated that contact between rubber and ballast when the circular patches exposed to the oil-contaminated gravels (lubricant oil) could improve the shear resistance and have a better deformation. It was observed that the deformation of the oilcontaminated with circular patches was reduced compared to the ballast without circular patches. The improvement of shear resistance is due to the increased ductility of composite and breakage control. It is with nothing that the present study were conducted is static in a scaled down model. Therefore, it is necessary for the future research to be conducted with full-scale test under dynamic loading to mimics the actual rail traffic. © 2016 Trans Tech Publications, Switzerland.


Majid M.A.,UTHM | Wan Badaruzzaman W.H.,UKM
Key Engineering Materials | Year: 2014

This research paper describes the investigation of new innovative form of lightweight composite known as Profiled Steel Sheeting Dry Board (PSSDB) wall panel system. Profiled Steel Sheeting Dry Board (PSSDB) is categorized as Industrialized Building System where paneling system has been developed to substitute the traditional structure of brick wall. The proposed system is a novel form of double and single sheathed composite panel. It consists of dry board and profiled steel sheet for middle core, attached by screws at both surfaces forming the composite action. This paper present the experimental results of twelve full scaled samples of PSSDB wall panel by using Cliplock 610 and PEVA45 as profiled steel sheet and PrimaFlex dry board for surface sheathed. All 12 wall panel samples have been tested under axial load until failure. From the experiment, it was found that the maximum load capacity of PSSDB wall panel can withstand is 1329kN with PEVA45 at screw spacing of 200 mm. While for the wall panel assembled using Cliplock 610, the maximum load is 612kN. The study shows that the new PSSDB wall panel system has a great potential to be used as a load bearing under axial load and expected to have a confidence for structural system in future construction. Copyright © 2014 Trans Tech Publications Ltd, Switzerland.


Jikan S.S.,UTHM | Abdullah S.S.,UTHM | Ismail M.H.,Engineering Materials Alliance ENiGMA | Ismail N.A.,Engineering Materials Alliance ENiGMA | Badarulzaman N.A.,Engineering Materials Alliance ENiGMA
Applied Mechanics and Materials | Year: 2014

Nickel (Ni)/ Copper (Cu) multilayer were deposited on Cu substrate by electroplating process using dual bath technique. Individual sample of multilayer with sublayer thicknesses of 1 μm, 5 μm, 10 iμm and 50 μm have been produced. The structure of the multilayer was characterized by X-Ray Diffraction and Scanning Electron Microscopy whereas one of the mechanical properties of the samples was investigated by means of Vickers Hardness. The results showed that the surface hardness of the coated Cu substrate increases if compared to that of pure Cu substrate. Additionally, these values increased when sublayer thickness of samples were decreased. © (2014) Trans Tech Publications, Switzerland.


Sulaiman E.,UTHM | Kosaka T.,NIT | Matsui N.,NIT
Renewable and Sustainable Energy Reviews | Year: 2014

This paper presents design viability studies and investigations of dual excitation switched-flux (DESF) motor as an applicant for traction drives in hybrid electric vehicles (HEVs). First of all, the main structure, the fundamental principle of operation and the design notion of the recommended DESF motor are discussed. Then, under certain limitations, specifications and performances of conventional interior permanent magnet synchronous (IPMS) motor, the preliminary performances of the recommended DESF motor are evaluated based on two-dimensional Finite Element Analysis (FEA). Since the initial performances fail to attain the target torque and power, design optimization based on deterministic approach of several DEFS motor parameters is applied in an attempt to attain the target performances. After a few cycles of design optimization, the improved DEFS motor has achieved the target power and torque of 123 kW and 333 Nm, respectively. In addition, due to definite advantage of robust rotor structure of DESF motor, rotor mechanical stress prediction at highest speed of 12,400 r/min is much lower than the mechanical stress in conventional IPMS motor. In conclusion, the final design DESF motor has the maximum torque of 11.97 Nm/kg and power density of 5.83 kW/kg, which is approximately 26% and 66% more than the torque and power density in existing IPMS motor. © 2014 Elsevier Ltd.


Khee Y.S.,Center for Electromagnetic Compatibility | Kiong S.C.,UTHM | Jenu M.Z.M.,Center for Electromagnetic Compatibility
Applied Mechanics and Materials | Year: 2013

Concern regarding the shielding effectiveness (SE) of building materials is gaining more response nowadays due to the awareness on the electromagnetic pollution (EMP) that is believed to results in disastrous consequence. A pure concrete inherently providing certain level of SE but it is not enough. Hence additional shielding and absorbing additives are added into the concrete. In this work MnxZn1-xFe2O4 will be added into the pure concrete to enhance its SE performance. The effect of microstructure, compositions, grain sizes, homogeneity, mixture volume of the MnxZn1-xFe2O4 will be considered for the optimization in this mixture. The key component to determine the SE of concrete is their electrical characteristic (relative permittivity and relative permeability). The parallel plate which is proposed previously will be used to determine the electrical characteristic of material and it will also be used for SE measurement. © (2013) Trans Tech Publications, Switzerland.


Nawawi A.,UTHM | Hasnan K.,UTHM | Ahmad Bareduan S.,Center for Academic Development and Training
Applied Mechanics and Materials | Year: 2014

Particle Swarm Optimization (PSO) algorithm is often used for solving RFID Network Planning (RNP) problems. However, the direct correlation between RNP parameters (coordinates and power settings of RFID readers) and PSO solutions is rarely shown. This is due to the fact that most researches done in this field focus more on the development of new variants of PSO and the optimization result. For that reason, this paper tends to investigate the correlation between RNP parameters and PSO solutions. One of RNP objectives (Optimal Tag Coverage) is taken as an example. The formula of optimal tag coverage is elaborated in order to expose the allocation of RNP parameters in the formula. In addition, a representation system for embedding RNP parameters in PSO solution is explained. This paper can also serves as an early guideline for solving RNP problems using PSO algorithm. © (2014) Trans Tech Publications, Switzerland.


Changing of requirements in a software project should be managed effectively. However, managing changes is a challenge due to many reasons. One of the reasons is requirements do not stand alone and they are typically related to one another in several ways. The relationships may impact individual requirement as well as the entire software project. Thus, this research aims to investigate how these types of requirements relationships impact requirements change as well as software project success. We examined the impacts from the perspective of business analyst using PLS. The findings can be used as a guide on working with requirements relationships knowledge that is useful for business analysts and research community. © 2015 The Authors.


Yee S.K.,Center for Electromagnetic Compatibility | Kiong S.C.,UTHM | Mohd Z.b.M.J.,Center for Electromagnetic Compatibility
Applied Mechanics and Materials | Year: 2014

Electromagnetic Interference (EMI) issue is gaining more attention as the result of proliferation of electrical and electronic devices. In order to reduce the exposure to EMI, shielding and absorbing materials are often applied. This paper discussed the process of forming the nickelzinc ferrite as one of the absorbing material by mixing the nickel nitrate, zinc nitrate and iron (III) nitrate together. X-ray diffraction, scanning electron microscopy, and dielectric measurement are carried out to reveal the characteristic of the specimen. The sintering temperature determines the formation of a pure spinal nickel-zinc ferrite and grain size. © (2014) Trans Tech Publications, Switzerland.


Al Aian A.E.,UTHM | Basuno B.,UTHM | Omar Z.B.,UTHM
Applied Mechanics and Materials | Year: 2014

The present work focuses on the development of computer code related to the longitudinal stability analysis on a propeller driven light aircraft model. The computer code designed in such a way, so for a given aircraft data will produce the result in term of: 1) Longitudinal stability derivatives in non dimensional form as well as in their dimensional form, 2) The longitudinal stability aircraft characteristics related to position of neutral point (stick free and stick fixed) also the requested forces for deflecting the control surface, 3) The transfer function in response to the control surface deflection for the component velocity and pitch angle. Through this developed computer code one can make an assessment the longitudinal behavior for the propeller driven light aircraft [1]. © (2014) Trans Tech Publications, Switzerland.


News Article | April 5, 2016
Site: www.topix.com

BATU PAHAT: Johor plans to be a pioneer in producing alternative energy within Malaysia by cooperating with Universiti Tun Hussein Onn Malaysia . Mentri Besar Datuk Mohamed Khaled Nordin said the state government, through Johor Petroleum Development Corporation , would be working closely with UTHM. Start the conversation, or Read more at The Star Online.

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