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Journal Cover   International Journal of Physical Sciences
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  This is an Open Access Journal Open Access journal
   ISSN (Print) 1992-1950
   Published by Academic Journals Homepage  [73 journals]
  • Optical properties of ZnO thin films deposed by RF magnetron

    • Abstract: We have grown ZnO thin films on glass substrate by R.F magnetron sputtering using metallic zinc target. The influences of some parameters on thin film optical properties were assessed. They exhibited extremely high resistivity of 1012 Ω.cm, an energy gap of 3.3 eV at room temperature. It was found that a R.F power of 50 W, a target to substrate distance of 70 mm, very low gas pressures of 3....
      PubDate: Mon, 16 Mar 2015 00:00:00 +010
       
  • Behavior architecture controller for an autonomous robot navigation in an
           unknown environment to perform a given task

    • Abstract: The aim of this paper is to carry out navigation task in an unknown environment with high density obstacles using an autonomous mobile robot. Fuzzy logic approach is used for the robot planning because the output varies smoothly as the input changes. If the navigation environment contains one or more obstacles the robot must be able to avoid collisions. The robot uses the obstacle avoidance ...
      PubDate: Mon, 16 Mar 2015 00:00:00 +010
       
  • Multi-objective optimization of hybrid PV/wind/diesel/battery systems for
           decentralized application by minimizing the levelized cost of energy and
           the CO2 emissions

    • Abstract: The main objective of this paper is to propose a methodology to design and optimize a stand-alone hybrid PV/wind/diesel/battery minimizing the Levelized Cost of Energy (LCE) and the CO2 emission using a Multi-Objectives Genetic Algorithm approach. The methodology developed was applied using the solar radiation, temperature and the wind speed collected on the site of Potou located in the nort...
      PubDate: Mon, 16 Mar 2015 00:00:00 +010
       
  • Kinetics study of copolymerization of 2-anilinoethanol onto chitosan by
           ammonium peroxydisulfate as a initiator

    • Abstract: Graft copolymerization of 2-anilinoethanol (2AE) onto chitosan (Chit-g-P2AE) was carried out by using ammonium peroxydisulfate (APS) as a long initiator under nitrogen atmosphere. Evidence of grafting was confirmed by comparison of FTIR spectrum of chitosan and the grafted copolymer. The grafting kinetics in the different conditions was studied as well. The effects of concentration of APS, 2...
      PubDate: Sat, 28 Feb 2015 00:00:00 +010
       
  • Egbin power station generator availability and unit performance studies

    • Abstract: This paper presents investigation on availability carried out on six steam unit generators in Egbin Thermal-Power Station in Nigeria. The availability investigation covers from 2005 to 2011 and was done through an exhaustive collection of data from samples of operating facilities in the power station. Data was collected from plant user maintenance log, operation records and manufacturers dat...
      PubDate: Sat, 28 Feb 2015 00:00:00 +010
       
  • The modified simple equation method for solving nonlinear diffusive
           predator-prey system and Bogoyavlenskii equations

    • Abstract: The modified simple equation method (The modified SEM) is employed to find the exact traveling wave solutions involving parameters for two nonlinear evolution equations, namely, the diffusive predator-prey system and the Bogoyavlenskii equations. When these parameters are taken to be special values, the solitary wave solutions are derived from the exact traveling wave solutions. It is shown ...
      PubDate: Sat, 28 Feb 2015 00:00:00 +010
       
  • Photoluminescence from GaAs nanostructures

    • Abstract: The confinement properties of semiconductor nanostructures have promising potential in technological application. The main objective of this study is to describe the dependence of Photoluminescence(PL) intensity on different parameters like temperature, excitation wavelength, time and photon energy of GaAs quantum dots (QDs). The model equations are numerically analyzed and simulated with ma...
      PubDate: Mon, 16 Feb 2015 00:00:00 +010
       
  • Relation between classical mechanics and physics of condensed medium

    • Abstract: An equilibrium system of potentially interacting material points in a nonhomogeneous field is studied by numerical simulations, as well as criteria which are needed in order to switch from the quantified model to the thermodynamic one. This paper studies the system passing a potential barrier and factors which affect the change of the systems internal energy. These factors include width of t...
      PubDate: Mon, 16 Feb 2015 00:00:00 +010
       
  • Financial planning for the preventive maintenance of the power
           distribution systems’ critical components using the
           reliability-centered approach

    • Abstract: Among different maintenance strategies that exist for power distribution systems, the Reliability-Centered Maintenance (RCM) strategy attempts to introduce a structured framework for planning maintenance programs by relying on network reliability studies and cost/benefit considerations. For the implementation of the RCM strategy, the electricity distribution companies try to optimally utiliz...
      PubDate: Mon, 16 Feb 2015 00:00:00 +010
       
  • On the hydrogenation-dehydrogenation of graphene-layer-nanostructures:
           Relevance to the hydrogen on-board storage problem

    • Abstract: Herein, results of thermodynamic analysis of some theoretical and experimental [thermal desorption (TDS), scanning tunneling microscopy (STM), scanning tunneling spectroscopy (STS), high-resolution electron energy loss spectroscopy/low-energy electron diffraction (HREELS/LEED), photoelectron spectroscopy (PES), angle-resolved photoemission spectroscopy(ARPES), Raman spectroscopy and others] ...
      PubDate: Fri, 30 Jan 2015 00:00:00 +010
       
 
 
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