International Journal of
Physical Sciences

  • Abbreviation: Int. J. Phys. Sci.
  • Language: English
  • ISSN: 1992-1950
  • DOI: 10.5897/IJPS
  • Start Year: 2006
  • Published Articles: 2555

Table of Content: 9 September; 6(18)

September 2011

Thermal stabilizers for poly(vinyl chloride): A review

Poly(vinyl chloride) (PVC) is one of the most important commercial plastic materials, but it is thermally unstable at processing temperature. Processing of PVC at elevated temperatures requires the use of thermal stabilizers. Widely used thermal stabilizers for PVC incorporate toxic heavy metal and organo-tin compounds that have been severely criticized based on environmental concern. In order to address this issue,...

Author(s): O. M. Folarin and E. R. Sadiku        

September 2011

Investigation on synthesis and size control of copper nanoparticle via electrochemical and chemical reduction method

Copper nanoparticles were synthesized and the effect of the operating conditions via both chemical and electrochemical synthesis methods was investigated in this paper. In the chemical reduction method, copper nanoparticles were prepared in a copper sulfate solution using NaBH4 as reducing agent and then stabilized in the presence of polyvinylpyrrolidone under nitrogen atmosphere. Temperature and...

Author(s): Hassan Hashemipour, Maryam Ehtesham Zadeh, Rabee Pourakbari and Payman Rahimi        

September 2011

A model about our Galaxy

We assumed the energy flow of the nuclear related with Dirac field, and compared it with Dirac equation. We found that energy flow equation has the same form with Dirac equation. There have been results taken from different item, which has the same mass of the energy that changed trend as the clock changed. We calculated the relationship of mass and radius of planet in solar system with the equations just to compare...

Author(s): JianXin Kang, and Wei Yuan        

September 2011

The spatial and volumetric variations of radon in Bangalore Metropolitan, India

Radon levels have been measured in houses at ten different locations of Bangalore City, India. The study was focused on the basis of quality of construction, age of building and room volume. Solid state nuclear track detectors were used for measuring the concentrations. The average spatial values of 222Rn and 220Rn concentrations were found to be 33.4 ± 6.1 and 21.6 ± 2.5 Bqm-3, respectively....

Author(s): L. A. Sathish, K. Nagaraja and T. V. Ramachandran        

September 2011

Detection of fault location in the transmission lines with voltage sampling and CT deletion by network impedance matrix method

There are a lot of methods for fault location using synchronized phasor measurement. Most of these methods are based on using measured voltage and current in one or two ends of a transmission line. Current measurement accuracy is limited according to the used current transformer’s (CT) accuracy. In this paper, besides various methods of fault distance location detection in power transmission lines, a new method...

Author(s): Ali Khatti Dizabadi, Soodabeh Soleymani and Mehrdad Ahmadi Kamarposhti        

September 2011

Electrical, structural and optical properties of ZnO thin films grown by pulsed laser deposition

We report the influence of oxygen partial pressure (PO2) on the electrical, structural and optical properties of no-stoichiometric ZnO (ZnO1-d) thin films grown by Nd:YAG pulsed laser deposition. We note that the electrical resistance of the ZnO1-d thin films is significantly modified by oxygen pressure; the electrical resistance decreases with the O2pressure in  the range  of 10 to 40...

Author(s): E. Chan y Díaz, V. Pech-Rodríguez, A. Duarte-Moller, E. Orrantia-Borunda, R. Castro-Rodríguez, I. Perez-Quintana and A. Iribarren        

September 2011

Modeling and simulation of maglev train-guideway-tunnel-soil system for vibration

A maglev train-guideway-tunnel-soil coupling system model is developed to study the wave propagation problem caused by high speed electromagnetic suspension (EMS) maglev train travelling through tunnel. The maglev train is simulated by multi-bodies, which takes the rigid body characteristics of the body-bogie-magnet system into account. The guideway-tunnel-soil system is simulated by 3D finite elements, and the...

Author(s): Jianwei Wang, Xianlong Jin, and Yuan Cao,        

September 2011

Bayesian networks for defining relationships among climate factors

Factors that shape the weather are studied to design models to make predictions. Understanding the relationships among these factors contribute to a better knowledge of atmospheric phenomena. However, conventional statistical techniques do not take into account the dependent relationships among these factors. Bayesian learning models are used in learning processes, which consist in quantification of conditional...

Author(s): Guillermo De la torre-Gea, Genaro M. Soto-Zarazúa, Ramón G. Guevara-González and Enrique Rico-García        

September 2011

3D numerical definition with vectors for human smiles

In most of the numerical methods for facial expressions in the literatures, the number of the key controls for animators or robot programmers are too complex and trivial, because what they want are less and critical controls. This study explored varied types of human smiles and extracted proper key factors affecting the smiles. These key factors then were converted into a set of control points which could serve to...

Author(s): Shyue-Ran Li, Kuohsiang Chen and Min-Yuan Ma        

September 2011

Groundwater quality assessment of Labuan Island

Groundwater is known as an important source of water supply due to its relatively low susceptibility to pollution in comparison to surface water, and its large storage capacity (USEPA, 1985). It should be mentioned that water pollution is any physical, chemical or biological change in the quality of water that has a harmful effect on any living thing that drinks, uses or lives in it. When humans drink polluted water, it...

Author(s): Hossein Moayedi, Bujang B. K. Huat, Afshin Asadi, Sina Kazemian and Thamer Ahmad Mohammad Ali        

September 2011

Modelling morbidity related absenteeism among workers in University of Ibadan Community, Nigeria: Poisson regression

Globally, sickness absenteeism is a contemporary public health problem, particularly in developing countries. However, very few studies had addressed the theoretical and methodological aspects of health related absenteeism among University workers. A retrospective study of sickness records of 4447 employees of University of Ibadan made available at the University Staff Clinic (Jaja). The health records of each staff for...

Author(s): Apau, G. S., Fagbamigbe, A. F., Adebowale, S. A. and Bamgboye, E. A.        

September 2011

Semantic discovery of web services using principal component analysis

With the increase in the number of available web services, searching for appropriate web services fulfilling the service discoverer’s functional requirements has become as major challenge. Web services standards, in their present format support only keyword based search and many services which can fulfill the user’s requirements are not retrieved. Basic requirement for efficient service discovery is to...

Author(s): Shalini Batra and Seema Bawa        

September 2011

Speech control of a teleoperated mobile humanoid robot

This paper presents a mobile humanoid robot platform which is able to understand humans' speech commands in teleoperation environments. For service in unstructured environments, the robot must operate efficiently under active auditory perception system to ensure a coordinated human-robot system. First, the speech-based teleoperation control is introduced, with the cameras mounting on the robots, transmitting the...

Author(s): Baocheng Wang, Zhijun Li and Weijun Ye        

September 2011

Some new classes of analytic functions defined using convolution

In this paper, we introduce and study some new subclasses of analytic functions defined in the open unit disc using the convolution technique. Inclusion results, radius problems and several other properties of these classes are discussed.   Key words: Convolution integral operator, functions with positive real part, alpha-starlike, bounded Mocanu variation, univalent.

Author(s): Khalida Inayat Noor        

September 2011

Behavior and performance of a photovoltaic generator in real time

Solar photovoltaic is of great importance for developing countries like Mauritania and Senegal, without which many villages in these countries would still be facing lack of electricity services for many years to come. The use of solar energy can contribute to the improvement of the living conditions of these populations. This work presents the development of a simulation model for predicting the performance of a solar...

Author(s): Ahmed M. Yahya, I. Youm, and A. Kader        

September 2011

A metamaterials inspired miniaturized phi-shaped antenna

This paper introduces a new low cost, robust miniaturized microstrip antenna inspired with metamaterial split ring resonator structure (SRR). Because of metamaterials property there has been considerable reduction in size. The overall antenna structure is phi shaped which is equivalent to two SRRs placed back to back. This phi shaped antenna (PSA) thus obtained has been simulated on EM solver Ansoft HFSS and scattering...

Author(s): Vipul Sharma, S. S. Pattnaik, Nitin, Tanuj Garg and S. Devi      

September 2011

Design of new square-lattice photonic crystal fibers for optical communication applications

In this paper, two new square-lattice photonic crystal fibers (PCFs) are designed and proposed. Both fibers have identical structures with five air-hole rings, yet the diameter of air-holes differ in their structures. Finite-difference time-domain (FDTD) method with the perfectly matched layers (PML) boundary conditions has been used to investigate these fibers. The proposed photonic crystal fibers exhibit properties of...

Author(s): Saeed Olyaee and Fahimeh Taghipour        

September 2011

Signature verification using rules 3-ext inductive learning system

This paper presents an alternative technique for “signature verification”. The technique employs template matching for feature extraction and Rules 3-ext inductive learning algorithm to extract the necessary set of rules and to verify a signature. 15 of 3 × 3 masks were used to represent a signature. Each signature (or pattern) is presented by the frequencies of the masks used. The system was trained...

Author(s): Mehmet Sabih Aksoy and Hassan Mathkour        

September 2011

Influence of tensile force of agave and tea plants roots on experimental prototype slopes

The study is aimed to determine the influence of tensile force of roots of agave (Angustifolio marginata) and tea (Acalypha siamensis) plants on landslide in prototype slopes. The plants of agave and tea were planted in different prototype slopes and the corresponding tensile forces were measured with the installed strain gauge in-situ. The study found that the tensile force of tea plants increase with...

Author(s): Habibah Lateh, Mukhsin Abu Bakar, Younus Ahmed Khan and I. Abustan          

September 2011

A constrained equalization scheme for mobile location in non-line-of-sight environments

Mobile location techniques in wireless communication networks have received significant attention in recent years. One of the main problems impeding accurate location estimation is non-line-of-sight (NLOS) propagation. In this paper, we propose a novel method by incorporating constrained optimization algorithm with an equalization scheme, where the weights are derived from root mean square delay spread, which is an...

Author(s): Zhang-Xin Chen, Guan Gui, Qun Wan and Fumiyuki Adachi            

September 2011

Analysis of transient heating due to exothermic reaction in a stockpile of combustible material

In this paper, the transient heating in a stockpile of combustible material due to an exothermic reaction in the presence of convective heat loss to the ambient is analyzed. The transient heating in a slab due to an exothermic chemical reaction with the possibility of heat loss to the ambient is considered. The chemistry involved in the problem is simplified by assuming a one-step finite-rate irreversible Arrhenius...

Author(s): B. H. Hamza, E. S. Massawe and O. D. Makinde