IEM Journal: Recent submissions
Now showing items 181-200 of 310
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Large eddy simulation of the effect of hat fux on pollutant dispersion in an urban street canyon
(The Institution of Engineers, Malaysia, 2009-12)The effect of heat flux on pollutant dispersion in an urban street canyon with fixed aspect ratio of 1 is investigated under four different heating configurations: windward heating, leeward heating, ground heating, and ... -
Determination of probability distribution for data on rainfalland flood levels in Bangladesh
(The Institution of Engineers, Malaysia, 2005-03)To evaluate flood (Discharge or water level) as well as rainfall frequency of given returns period, it is essential that one probability distribution function be used as a standard. In many countries one distribution ... -
Screening alternative chemical routes based on inherent chemical process properties data: Methyl methacrylate case study
(The Institution of Engineers, Malaysia, 2009-12)In 1988 a campaign called Responsible Care was initiated as a response to the adverse publicity of the Bhopal disaster. The initiative commits chemical industries to improve safety, health, and environmental (SHE) performance. ... -
Derivation of switching angles of the cascaded multilevel voltage source inverter subjected to a new pulse width modulation scheme
(The Institution of Engineers, Malaysia, 2009-09)A new modulation scheme for a five-level cascaded multilevel inverter is proposed. Unlike other schemes, the proposed method is based on the symmetric regular sampling unipolar PWM with a single carrier and multiple ... -
Bed load transport model for field conditions – Using characteristic diameter approach
(The Institution of Engineers, Malaysia, 2005-03)A deterministic bed load transport model based on mixed-size (non-uniform) bed material (MBB) has been developed using characteristic particle diameter and published laboratory and field data from the North American and ... -
Development and validation of emission model for a petrol engine using response surface methodology (RSM)
(The Institution of Engineers, Malaysia, 2005-12)Hydrocarbon emissions are generated from the presence of unburned fuel in the exhaust of a petrol engine. Liquid fuels contain 10 to 20 major species of hydrocarbon and some 100 to 200 minor species. Most of these species ... -
Synthesis of Tio2-Sio2 powder photocatalyst via sol-gel method: Effect of titanium precursor type on powder properties
(The Institution of Engineers, Malaysia, 2009-12)TiO2-SiO2 powder photocatalysts with varied SiO2 portion were prepared through sol-gel technique using two types of metal alkoxides: titanium tetraisopropoxide (TPT) and titanium diisopropoxide (PTP). Tetraethoxysilane ... -
Numerical study of an anisotropically supported rotor with parametric excitation
(The Institution of Engineers, Malaysia, 2009-09)Anisotropic structures, e.g. oil journal bearings are often employed as supporting structure for rotating machineries. Moreover, cross-section of rotating element is often non-symmetrical due to various practical reasons. ... -
Effect of ship size, forward speed and wave direction on relative wave height of container ships in rough seas
(The Institution of Engineers, Malaysia, 2009-09)This paper deals with the numerical calculations of relative wave height of ships in the rough seas. Linear potential theory has been applied for describing fluid motion and 3-D sink-source technique has been used to ... -
Elasto-plastic deformation of hostun sand during cyclic loading in triaxial test
(The Institution of Engineers, Malaysia, 2005-03)Cyclic triaxial tests were performed on dry air-pluviated solid cylindrical (7 cm diameter and 15 cm high) specimens of Hostun sand (French sand). Both axial and radial strains were measured locally by using, respectively, ... -
Physicaland mechanical behavior of concrete in seawater under high hydrostatic pressure
(The Institution of Engineers, Malaysia, 2005-06)As a part of a durability study of concrete exposed to sea water environment, the paper describes the effect of sea salts on the physical and mechanical properties of concrete under large hydrostatic pressure. Specially ... -
Development of a less complex single phase active harmonic filter
(The Institution of Engineers, Malaysia, 2005-09)Harmonic pollution has become a serious problem in recent years. Harmonic is introduced into power systems due to nonlinear loads or system components presenting non-linear behavior. An active power filter is one of the ... -
Development and performance evaluation of a prototype electric hybrid powertrain system for automotive applications
(The Institution of Engineers, Malaysia, 2005-03)Researchers at Universiti Teknologi Malaysia (UTM) have developed a dedicated hybrid power plant based on the parallel configuration using a gasoline engine coupled to a high performance electric motor, specifically ... -
Throughput analysis of buffered CSMA/CD based single channel Fast Ethernet optical LAN
(The Institution of Engineers, Malaysia, 2005-06)This paper provides the throughput performance of a buffered CSMA/CD based single channel Fast Ethernet optical LAN. The conventional CSMA/CD does not provide good throughput due to its inherent unfairness caused by ... -
Studies on effect of temperature and concentration on thermophysical properties of Chokanan mango juice
(The Institution of Engineers, Malaysia, 2005-12)The thermophysical properties of mango (Mangifera indica L.) juice of the Chokanan variety at medium maturity as affected by temperature and concentration were studied. The thermophysical properties were determined at ... -
Hybrid input shaping and PID control of a flexible robot manipulator
(The Institution of Engineers, Malaysia, 2009-09)This paper presents experimental investigations into the development of hybrid input shaping and PID control for vibration suppression and input tracking of a flexible robot manipulator. Initially, a PID controller is ... -
A model for prioritisation of industrial air pollutants: Part II. Application
(The Institution of Engineers, Malaysia, 2005-06)A model for prioritisation of industrial air pollutants was recently developed for use in Sama Jaya Free Industrial Zone (SJFIZ), Kuching based on the amount of toxic organic chemicals released into the atmosphere through ... -
Highly reactive electrogenerated zinc: Preparation and its use in cross-coupling reactions
(The Institution of Engineers, Malaysia, 2005-03)Highly reactive zinc metal was prepared by electrolysis of a N,N-dimethylformamide (DMF) solution containing naphthalene and a supporting electrolyte in a one-compartment cell fitted with a platinum cathode and a zinc ... -
TiO2 powder photocatalyst from sol-gel route and its immobilisation with cement for photocatalytic phenol removal
(The Institution of Engineers, Malaysia, 2009-12)Two types of TiO2 powders of water-to-TPT ratios (Powder 1: water/TPT = 1 and Powder 2: water/TPT= 2) were synthesized via sol-gel method. The effect of hydrolysis degree on the formation of TiO2 powder particles was ... -
Uniaxial die compaction of food powders
(The Institution of Engineers, Malaysia, 2009-12)This paper presents a study of uniaxial die compaction of food powders for typical food powders such as maize powder and maize grits as well as a universal binder known as microcrystalline cellulose or Avicel. This method ...