International Journal of
Physical Sciences

  • Abbreviation: Int. J. Phys. Sci.
  • Language: English
  • ISSN: 1992-1950
  • DOI: 10.5897/IJPS
  • Start Year: 2006
  • Published Articles: 2556

Table of Content: 9 February; 7(7)

February 2012

Laminar and turbulent power law fluid flow passing a square cylinder

In this work, a two-dimensional laminar and turbulent Power law fluid flow passing a square cylinder is numerically investigated. In the investigation, a finite volume code based on the SIMPLEC algorithm and non-staggered grid was used. In the discretization of the convective and diffusive terms, the third-order QUICK and the second-order central difference scheme, respectively were used. The turbulent flow was...

Author(s): Izadpanah Ehsan, Sefid Mohammad, Nazari Mohammad Reza and Jafarizade Ali

February 2012

Numerical study of unsteady Rayleigh-Benard instabilities in a Newtonian fluid confined in an enclosure bounded by two paraboloidal surfaces differentially heated

Using a paraboloidal coordinate system and a vorticity- stream function formulation, the authors studied numerically the two-dimensional unsteady natural convection of a Newtonian fluid confined between two paraboloids of revolution with vertical axes. The opening on the upward surface is heated up with a constant temperature, while the rest remains thermally isolated. The downward opening on the upper surface is...

Author(s): Samba Dia, Cheikh Mbow and Joseph Sarr

February 2012

Design and development of unit cell and system for vanadium redox flow batteries (V-RFB)

Vanadium redox flow battery (V-RFB) has been attracted by many researches; some are under field testing and demonstration stage, but information on construction, experimental characterization, electrolyte preparation, overall systems under study, etc. are still limited. This paper focus on the technical issues faced and the lessons learnt during the development of unit cell and system for V-RFB. Firstly, brief...

Author(s): M. R. Mohamed, S. M. Sharkh, H. Ahmad, M. N. Abu Seman and F. C. Walsh

February 2012

Modified homotopy perturbation method for stiff delay differential equations (DDEs)

In this paper, an efficient modification is introduced into the well-known homotopy perturbation method which proves very effective to control the convergence region of approximate solution. By using this scheme, explicit exact solution is calculated in the form of a convergent power series with easily computable components. The proposed algorithm is tested on some neutral stiff functional-differential...

Author(s): M. A. Asadi, F. Salehi, S. T. Mohyud-Din and M. M. Hosseini

February 2012

Application of He’s Exp-function method and semi-inverse variational principle to equal width wave (EW) and modified equal width wave (MEW) equations

In this paper, more recent method, called the Exp-function, is used to find generalized solutions of the important soliton equations which is called equal width wave (EW) and modified equal width wave (MEW) equations. It is shown that the Exp-function method with the help of symbolic computation provides a straight forward and powerful mathematical tool for solving other nonlinear evolution equations arising in...

Author(s): H. A. Ali, A. Biswas and K. R. Raslan,

February 2012

Management flight simulator of pension expenditure

Salary risk and demographic risk have been identified as main risks in analyzing pension expenditure particularly in defined benefit pension plan. Thus, this paper described the development of management flight simulator for pension expenditure (with particular case on a Malaysia Defined Benefit pension plan). Public pension plan in Malaysia is studied to analyze pension expenditure due to salary and demographic...

Author(s): Hasimah Sapiri, Anton Abdulbasah Kamil and Razman Mat Tahar

February 2012

Web’s critical survey analysis with respect to current loopholes

Vulnerabilities are the loopholes that arise due to poor programming. Web applications are considered to be very vulnerable to attack as compared to desktop programs on sole computers. Keeping this thing in our minds, we decided to find out all the possible vulnerabilities in Saudi Arabian organization’s web servers. To assess these vulnerabilities, we selected number of open source tools and tested about 169 most...

Author(s): Maqsood Mahmud and Abdurrahman Alkarim Mirza

February 2012

A harmony search based pairwise sampling strategy for combinatorial testing

Over the years, we become increasingly dependent on software in many activities of our lives. To ensure software quality and reliability, many combinations of possible input parameters, hardware/software environments and system conditions need to be tested and verified against for conformance. Due to resource constraints and time-to-market pressure, considering all exhaustive testing is practically impossible. In order...

Author(s): Abdul Rahman A. Alsewari and Kamal Z. Zamli

February 2012

Arabic text-dependent speaker verification for mobile devices using artificial neural networks

Speaker verification is one of the biometric verification techniques used to verify the claimed identity of a speaker. It is mainly applied for security reasons and managing users’ authentication. Voiceprint can be used as a unique password of the user to prove his/her identity. In this paper, we propose a new Arabic text-dependent speaker verification system for mobile devices using artificial neural networks...

Author(s): Abdulrahman Alarifi, Issa Alkurtass and Abdul Malik S. Al-Salman

February 2012

Evaluation of different ratios of auxin and cytokinin for the in vitro propagation of Streptocarpus rexii Lindl.

A successful means of in vitro propagation of Streptocarpus rexii Lindl. using leaf tissue as the explants is described. Secondary explants were placed on several regeneration media supplemented with various concentrations of indole-acetic acid (IAA) and benzyladenine (BA). Optimal shoot proliferation was obtained on Murashige and Skoog basal media containing 0.1 mg/L IAA in combination with 0.5 mg/L...

Author(s): Jade J. North and Patrick A. Ndakidemi

February 2012

Study of some face physical dimensions in Iranian boys

Anthropometry is applied in medical profession, such as maxillofacial surgery, growth and development studies, plastic surgery, bioengineering and non-medical branches such as respiratory equipment and eye-glasses industries. The aim of this study was to determine face physical dimension and cephalo-facial anthropometric ratios in 4 to 11-year-old boys of Iranian Kurmanj population. This cross sectional analytical study...

Author(s): Azami Mahdi, Esmaeilzadeh Mahdi, Bagheri Hojat and Roshan Hossein

February 2012

Study of workability of fresh concrete using high range water reducer admixtures

The main issue in working with fresh concrete is the workability during filling of formwork. One of the problems found in workability is occurrence of segregation depending on w/c ratio. Segregation is strongly related to w/c ratio. The fresh concrete is usually considered as a non-Newtonian fluid since it is a mixture of aggregate, cement and water. The flow behaviour of the fresh concrete, a characteristic that is...

Author(s): Ayhan Åžamandar and M. V. Gökçe

February 2012

Finite element analysis of wooden chair strength in free drop

Wooden furniture is being widely used in all countries due to its convenience and being produced from the natural raw material. In furniture design esthetic, ergonomics and safety are the main criteria. Safety means the strength of furniture. Unfortunately, most of the time the strength of furniture is not taken into account in design as much as esthetic and ergonomics. This leads to the use of excess material meaning...

Author(s): Mustafa Hilmi ÇOLAKOÄžLU and Ahmet Celal APAY

February 2012

Simulation research on natural smoke ventilation and external airflow in large space: Case study of the improvement project of Taoyuan International Airport, terminal 1

The paper analyzed the influence of external airflow on natural smoke ventilation in large space by means of computational fluid dynamics (CFD) and engineering calculation. The purpose of the paper is Terminal 1 of Taiwan Taoyuan International Airport after renovation. In the renovation project, the separate departure and arrival halls will be connected to create a large atrium; natural smoke ventilation will be adopted...

Author(s): Yu-Chang Lin, Chung-Hwei Su and Yu-Cheng Lu