February 2012
Improving squirrel cage induction motor efficiency: Technical review
Studying and improving of Squirrel Cage Induction Motor (SCIM) efficiency is a continuous area of interest not only among the researchers but also the industry, manufacturer and government. However, until today there are still struggles to find the most holistic environment of the SCIM which achieve its efficiency at the most lowest cost and at the same time sustaining the performance of the motor. This paper will focus...
February 2012
Planes and axes of symmetry in an elastic material
Simple proofs are obtained for the Cowin-Mehrabadi theorem for the identification of a plane of symmetry or an axis of symmetry in an elastic material. The treatment is generalized to a cartesian tensor of arbitrary rank. Necessary and sufficient conditions are found for the existence of a plane of symmetry or an axis of symmetry for a piezoelectric material. Conditions are obtained for the identification of...
February 2012
Exact solutions for vibrational states with generalized q-deformed Morse potential within the asymptotic iteration method
Exact eigenvalues and eigenfunctions of the Schrödinger equation with generalized q-deformed Morse potential for diatomic molecules have been derived in the framework of the asymptotic iteration method (AIM). The obtained solutions have been applied to calculate the energies of bound vibrational levels of the lithium molecule in the state. Compared to AIM previous calculations, our results are...
February 2012
The hypernucleus as a three body system
The different properties of hyper-nucleus are studied using hyper-spherical harmonics method. The hyper-nucleus is considered as a three body system consisting of ïŒ particle and two ï¡ particles. The effect of different types of the ï¡ï€ï¡interactions on the calculated binding energy of ïŒ in is studied. Different sets...
February 2012
Comparison of empirical and artificial neural network models for the correlation of monthly average global solar radiation with sunshine hours in Minna, Niger State, Nigeria
Monthly average daily values of global solar radiation and sunshine hours over a period of five years (1987-1991) using artificial neural network were developed to predict global solar radiation at Minna which lies on latitude 09.37°N, longitude 06.32° and 265.4 m above sea level. The results were used to compare results from other researchers of different models in the same area. The correlation...
February 2012
Reliable treatments of differential transform method for two-dimensional incompressible viscous flow through slowly expanding or contracting porous walls with small-to-moderate permeability
In this article, the problem of laminar, isothermal, incompressible and viscous flow in a rectangular domain bounded by two moving porous walls which enable the fluid to enter or exit during successive expansions or contractions is solved analytically by using the differential transform method (DTM). Graphical results are presented to investigate the influence of the non-dimensional wall dilation rate and seepage...
February 2012
Robust linear optimization under new distance measure
Several robust counterparts of linear optimization problems with uncertain data were proposed since 1970 and have been extensively studied and extended. In these approaches, the uncertainty set plays an important role since it determines the level of protection of the solution; the solution might be too conservative in order to ensure that the solution remains feasible if the disturbance of data is relatively large. In...
February 2012
Tailoring wind properties by various passive roughness elements in a boundary-layer wind tunnel
Boundary-layer wind tunnel provides a unique platform to reproduce urban, suburban and rural atmospheric boundary layer (ABL) by using roughness devices such as vortex generators, floor roughness, barrier walls, and slots in the extended test-section floor in the contraction cone. Each passive device impacts wind properties in a certain way. In this study, influence of various passive devices on wind properties has been...
February 2012
Mapping biogenic gas concentration of Pontian Peatland, Southwest Malaysia with ground penetrating radar
In this work, we surveyed the internal structure of peat deposit with ground penetrating radar with the aim of mapping the spatial distribution of biogenic gas produced and accumulated as a bye product of anaerobic decomposition of the deposit. The objective of the work is to identify the spatial distribution of hotspots prone to forest fire due to high concentration of the flammable gas. Four profiles of 20 m each at...
February 2012
Removal of Cr(III) from aqueous solutions using a micaceous poly–mineral from Kenya
Adsorption of Cr(III) ions from aqueous solutions using a micaceous polymineral (MPM) from Kenya was studied using batch experiments as function of contact time, adsorbent dosage, Cr(III) concentration, pH and temperature. Chromium adsorption was found to be a fast process taking place in less than 20 min to reach equilibrium. Near complete removal of the metal was realized at Cr(III) concentrations of 200 mg/L, using...
February 2012
Volumetric, viscometric and ultrasonic studies on binary mixtures of oleic acid with alkyl esters at 303.15, 308.15 and 313.15 K
Density (r), viscosity (η) and speed of sound (u) for binary mixtures of oleic acid with methyl acetate, ethyl acetate, n-propyl acetate and n-butyl acetate were measured at 303.15, 308.15 and 313.15 K over the whole composition range at atmospheric pressure. These results were used to calculate excess molar volumes (VE), deviations in viscosity (Δη), deviations in speed of sound (Δu), the excess...
February 2012
Adsorption isotherms of celebrex as non-steroidal anti-inflammation on single-walled carbon nanotubes
The objective of this work is to study the adsorption behavior of celebrex as non-steroidal anti-inflammation on single-walled carbon nanotubes (SWCNTs). As the function of temperature and initial concentration of adsorbate were observed through adsorption isotherms, the amount of celebrex adsorbed on carbon nanotube surface increased with the concentration at constant temperature, and decreased with the increase of...
February 2012
Evaluating integrals of the form by Adomian decomposition
This paper considers evaluation of the general class of integrals of the form using the Adomian decomposition method. This integral is solved in its general form and it is shown that particular values of of this class of integrals correspond to Mellin and Gaussian integrals whose solutions are easily obtained. Key words: General class of integrals, Adomian...
February 2012
Hybrid general-purpose computation on GPU (GPGPU) and computer graphics synthetic aperture radar simulation for complex scenes
In this paper, a new hybrid general-purpose computation on GPU (GPGPU) and computer graphics synthetic aperture radar (SAR) simulation method for complex scenes is proposed. Previous SAR simulations for complex scenes only use GPU’s graphics capabilities for scattering calculation in graphical electromagnetic computing (GRECO) algorithm. The new hybrid method use GPU’s graphics and parallel computing...
February 2012
Empirical analysis of a micro-evolutionary algorithm for numerical optimization
This paper presents an empirical comparison of some evolutionary algorithms to solve numerical optimization problems. The aim of the paper is to test a micro-evolutionary algorithm called Elitist evolution, originally designed to work with small populations, on a set of diverse test problems (unimodal, multimodal, separable, non-separable, shifted, and rotated) with different dimensionalities. The comparison covers...
February 2012
Robust sliding mode observer design for a class of uncertain linear systems with fault reconstruction synthesis
In this paper, a robust sliding mode observer (SMO) design problem is investigated for the purpose of reconstruction of actuator faults in a class of uncertain linear systems. A sufficient condition for the existence and the stability of the SMO is established by solving a set of linear matrix inequalities (LMIs). Also, a new design method for the robust SMO with H∞ techniques is proposed to guarantee...
February 2012
Social implications of robots – An overview
Machines by their design are aimed at increasing and improving the efficiency of productive activities where they are applied. The result is that they are given preference against manually operated productive activity. This paper explored the gradual and yet progressive introduction of machines, namely, robots into the production processes of industries following the industrial revolution of the 20th century and the...
February 2012
Use of cement, polypropylene fibers and optimum moisture content values to strengthen peat
This article describes a laboratory study on strengthening peat with cement and polypropylene fibers. The study involved mixing peat with different amounts of cement, with or without fibers; compacting at their respective optimum moisture content and curing them in air for 1, 28 or 90 days. Unconfined compressive strength (UCS) and California bearing ratio (CBR) tests were performed (unsoaked and soaked samples) to...
February 2012
Simulation and experimental work on manufacturing torispherical heads in explosive hydro-forming process
This study presents a numerical investigation on the deformation of the circular blanket against a male die under impulsive loading to form a torispherical heads shape. A finite element model was developed and verified with experimental tests for the explosive forming of the torispherical heads made of AA5083 aluminum alloy in the framework of LS-DYNA crash simulator software. The nature of the deformation was turned...
February 2012
Intermonsoon water mass characteristics along coastal waters off Kuala Terengganu, Malaysia
This work utilized temperature-salinity (T-S) diagram to explore the physical properties of water masses during intermonsoon period. In doing so, the physical properties of water column, such as temperature and salinity are collected from cruise conducted in September 2002 and October 2003. Hydrolab instrument was used in the coastal water of Kuala Terengganu, Malaysia. The vertical water temperature and salinity with 5...
February 2012
A simulation study on the capabilities of rotor wing unmanned aerial vehicle in aerial terrain mapping
Many applications can be solved by using the unmanned aerial vehicle (UAV) technology such as farming, surveillance, monitoring, fire disaster, flood monitoring and aerial terrain mapping. This study was carried out to investigate the use of light weight rotary-wing UAV for mapping simulation model. The accuracy of photogrammetric product will be assessed as one of the objectives of this study. There are two types of...
February 2012
Algicidal effects of Alternanthera philoxeroides mediated by the nutrient environment in a shallow, eutrophic lake (Chaohu Lake, China)
We investigated the nitrogen and phosphate nutrient status in the habitats of Alternanthera philoxeroides and its co-occurring algal growth in a field survey. We also determined the algicidal activity of A. philoxeroides extracts from a diversity of habitats in Chaohu Lake, China, in the laboratory. We then tested the correlation between the nutrient status and the algicidal activity of A....
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