International Journal of
Physical Sciences

  • Abbreviation: Int. J. Phys. Sci.
  • Language: English
  • ISSN: 1992-1950
  • DOI: 10.5897/IJPS
  • Start Year: 2006
  • Published Articles: 2563

Table of Content: 16 November; 7(43)

November 2012

Theoretical background of 1/f fluctuations of energy partition among harmonic oscillators in equilibrium

A physical background is derived for the generation of 1/f fluctuations that are observed ubiquitously in energy partition in quasi-harmonic oscillators that exchange energy through weak nonlinear interactions. Weak three-mode coupling terms in the unperturbed Hamiltonian bring no net transfer of energy between oscillators, but four-mode coupling terms bring about irreversible energy transfer between unperturbed...

Author(s): Toshimitsu Musha

November 2012

Chebyshev-Tau method for the linear Klein-Gordon equation

In this paper, we study a numerical method based on polynomial approximation, using the shifted Chebyshev polynomial, to construct the approximate solutions of the one dimensional linear Klein-Gordon equation with constant coefficients. Also, we give general forms of the operational matrices of integral and derivative. We solve two illustrative examples to test this method known as the shifted Chebyshev Tau method. By...

Author(s): Nejla Gurefe, Emine Gokcen Kocer and Yusuf Gurefe

November 2012

Solution of sixth-order boundary-value problems by collocation method using Haar wavelets

A new method based on uniform Haar wavelets is proposed for the numerical solution of sixth-order two-point boundary value problems (BVPs) in ordinary differential equations. Numerical examples are given to illustrate the practical usefulness of present approach. Accuracy and efficiency of the suggested method is established through comparison with the existing spline based technique and variational iteration method....

Author(s): Fazal-i-Haq, Arshed Ali, and Iltaf Hussain

November 2012

Experimental investigations of immune fuzzy Q-learning algorithms for robot obstacle avoidance

This article presents a new approach to car-like robot control for obstacle avoidance and target tracking. The proposed approach employs cooperative algorithms including artificial immune algorithms, fuzzy logic and Q-learning denoted shortly as IFQ-learning control. The article explains the artificial immune system and the proposed algorithms. The fuzzy Q-learning algorithms are also presented. The article elaborates...

Author(s): Suchart Punpaisarn and Sarawut Sujitjorn

November 2012

Effect of storage and thermochemical treatments on glass indentation cracks and residual stresses

In this work, the effect of storage, annealing and chemical strengthening on indentation radial cracks of a sodalime glass is presented. During the storage of an indented glass with a Vickers indenter, the induced radial cracks propagate under the combined effect of the residual stresses and the environmental humidity (stress corrosion). The cracks length achieves a threshold of stability after 6 to 24 h. The...

Author(s):   K. Ayadi, L. Younes, Z. Malou, M. Kolli and M. Hamidouche

November 2012

Influence of natural long fiber in mechanical, thermal and recycling properties of thermoplastic composites in automotive components

Natural fiber thermoplastic components in the automotive industry can afford the advantages of weight, cost reduction and recyclability, compared to conventional materials. Handlings of natural fibers in automotive exterior and interior components are essential to recover eco-efficiency and renewability. Natural fibers have recently become affordable to automotive industry as an alternative reinforcement for glass fiber...

Author(s): S. Jeyanthi and J. Janci Rani

November 2012

Low temperature hydrothermal synthesis of BaTiO3 with ultra-high crystallinity

Nano-sized barium titanate (BaTiO3) powders with ultra-high crystallinity have been successfully prepared by a hydrothermal condition at 170°C for only 2 h. In this study, the influence of processing parameters on the phase and the particle size of hydrothermally derived BaTiO3 powders was investigated. The powders were investigated by X-ray diffraction (XRD), scanning election microscopy (SEM),...

Author(s): S. A. Manafi, M. R. Rahimipour  and A. Soltanmoradi

November 2012

Development of an experimental apparatus for testing a total knee prostheses focused on Mexican phenotype

This work was focused on the design and development of an experimental loading rig adapted to make experimental tests of total knee prosthesis. Location of contact points due to rotation and translation of simultaneous movements was analyzed carefully. This takes place between the femoral component and the polyethylene insert, since this is one of the main obstacles in the design of devices adapted to...

Author(s): Rafael Rodríguez-Martínez, Guillermo Urriolagoitia-Sosa, Christopher René Torres-San Miguel, Luis Héctor Hernández-Gómez, Guillermo Urriolagoitia-Calderón and Manuel Faraón Carbajal-Romero

November 2012

Determinants of residential water demand in an arid and oil rich country: A case study of Riyadh city in Saudi Arabia

The accurate forecast of residential water demand is critically important for arid and oil rich countries such as Saudi Arabia which depend on costly desalination plants to satisfy the growing water demand. Achieving the desired prediction accuracy is a challenging task since the forecast model should take into consideration a variety of factors such as economic development, climate conditions and population growth. The...

Author(s): Ibrahim Almutaz, Abdel Hamid Ajbar and Emad Ali

November 2012

River Usuma: A medium of assessing bioavailability of heavy metals in Abuja

River Usuma was used as a substrate through which toxic elements and their sources were identified and measured due to anthropogenic activities in Federal Capital Territory (FCT), Abuja. It makes good public health sense, good economic and environmental sense to prevent water contamination at the source. Concentrations of heavy metals [Zinc (Zn), Manganese (Mn), Copper (Cu), Cadmium (Cd), Lead (Pb), Iron (Fe),...

Author(s): Ugwu, A. I., Wakawa, R. J., Kana, M. Z., La’ah, E. and Olotu, A.

November 2012

Interaction of essential properties of potential layers in stormwater management using column method

Yearly forecasting data indicate that wet season occurs at short intervals. Flooding and drainage problems have been sources of complaints from local and surrounding communities in Sri Gading area. The current situation is made more difficult because of the flat area and low infiltration rate. An investigation on this location shows that most of the Parit Raja area sits on compacted clay more than 30 m deep. The failure...

Author(s): Sabariah Musa, Nor Azazi Zakaria and Lau Tze Liang

November 2012

Sample of Batman in determination of urban solid waste management and recycling potential

The collection, transport, treatment, and disposal of solid wastes, particularly wastes generated in medium and large urban centres, have become a relatively difficult problem to solve for those responsible for their management. However, recycling-related activities bring waste reduction, prevention of waste of raw materials and less environmental damage as well as providing an economic benefit to the countries. In this...

Author(s): Mehmet Z. IÅŸik, NeÅŸe Budak, Hamit Adin, Tolga Topkaya and Hasan Oktay