JFAS_Vol 03 N 01
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Item Application Of Fuzzy Ensembles For Optimal Distribution Of Power In Electrical Networks(University of Eloued جامعة الوادي, 2011-01-01) Guediri, A.; Ben Attous, D.Optimal power flow calculation (OPF), used to optimize specific aspects of power system operations, usually employ standard mathematical programming techniques. These techniques are not suitable to handle many practical considerations encountered in power systems, including the uncertainty of the operational constraints [1]. They can be relaxed temporarily, if necessary, to obtain feasible solutions. For taking well into account this type of constraints, one proposes in this work the application of a method based on fuzzy sets to the OPF problem. The developed method has been tested on standard scale power systems (IEEE30bus).Item Study Of Ionization Rates Of Helium Maxwellian Plasma(University of Eloued جامعة الوادي, 2011-01-01) Dilmi, S.; Guedda, E. H.; Boumali, A. M.We have contributed to the study and calculation of ionization rate coefficients from the cross sections of neutral helium. Numerical methods and FAC code are used in this work. Our calculations are comparable to published results.Item Simulation Of Thermo-elastics Properties Of Thermal Barrier Coatings(University of Eloued جامعة الوادي, 2011-01-01) Ferouani, A. M.; Faraoun, H. I.; Aourag, H.Thermal barrier coatings are used to protect different parts in compressors and turbines from heat. They are generally composed of two layers, one metallic layer providing resistance to heat corrosion and oxidation, and one thermally insulating ceramic layer. Two different techniques are industrially used. Plasma spray results in a lamellar structure granting a low thermal conductivity, but with a low thermal expansion compliance. Electron Beam Physical Vapour Deposition generates a columnar structure allowing a better accommodation of the thermal expansion stresses, entailing improved lifetime of the coating, but with a higher thermal conductivity. The aim of the paper presented here is to develop a procedure of analysis based on the micro structural observation for the prediction of the properties of new coatings in court of industrial development and to predict the effect of the posterior thermal treatment on the properties of the coatings carried out. For a given coating, one has to calculate linear elasticity and its evolution with the temperature as well as thermal expansion, aiming at predicting different parameters related to the in service deterioration.Item Quality Of Waters Of Aquifer Webs Of Biskra Region(University of Eloued جامعة الوادي, 2011-01-01) Bouchemal, F.; Bouchahm, N.; Achour, S.Controlling the quality of water distributed together with sound resource management is a factor of economic and social development. Also, the chemistry and knowledge of geological and hydrogeological aquifer, the object of this work, we identify the water quality examined through physical-chemical parameters. The study of these parameters more precisely the region of Biskra reveals a generally high mineralized whose origin is essentially the geological nature of enclosing land. However, the waters of the continental interlayer (Albian) are the chemical profile weakest; however, its high temperature makes it difficult to use both to supply drinking water as well as for irrigation. After synthesis of the results for different sheets (groundwater, Miopliocene, Eocene, Albian), the limestone is most interesting at least for drinking water, part of its rate of mineralization (medium), the acceptable temperature (24°C) and its relatively low salinity (1 to 3 g/l). However, these waters are not used directly for human consumption. They requires further treatment.Item Towards A Model Of Context-aware Infrastructure In Mobile Ubiquitous Computing(University of Eloued جامعة الوادي, 2011-01-01) Beggas, M.The aim of this paper is to propose the main components of a system that provide a model for context aware architecture in mobile ubiquitous computing as a layered architecture. The modeled system provide services should be adapted according to context for end user application, that can be executed in a mobile device as mobile web or mobile application.Item Numerical Simulation And Optimization Of Performances Of A Solar Cell Based On Cdte(University of Eloued جامعة الوادي, 2011-01-01) Ferouani, A. M.; Merad Boudia, M. R.; Rahmoun, K.This article has as an aim the study and the simulation of the photovoltaic cells containing CdTe materials, contributing to the development of renewable energies, and able to feed from the houses, the shelters as well as photovoltaic stations… etc. CdTe is a semiconductor having a structure of bands with an indirect gap of a value of 1,5 eV at ambient temperature what means that photon wavelength of approximately 1200 nm will be able to generate an electron-hole pair. One speaks about photogeneration. We will lay the stress, initially, on the essential design features of a photovoltaic module (the open-circuit tension, the short-circuit current, the fill factor, and the output of the cell), our results was simulated with the SCAPS computer code in one dimension which uses electrical characteristics DC and AC of the thin layers heterojunctions. The results obtained after optimization are: VCO = 0.632V, Jsc = 39.1 mA/cm2, FF=82.98 % and the output energy of conversion is 18.26%.Optimization is made according to the temperature and the wavelength.Item Geometry Of Waves Guides For Containment Of Propagating Resonant Modes(University of Eloued جامعة الوادي, 2011-01-01) Aboura, Z.; Bouhafs, B.We are study de mode fundamental de 1D in the two media (MIM and IMI) of a metallic structure (Ag) (silver) in which a small hole is perforated (as à dielectric medium). We take the conditions that resonant modes (PPSs) are confined or the surface.Via the complex permittivity of the metal and those of the dielectric medium .The effective index neff of the elaborated structure controlled remarkably the properties of the propagating modes. Of the structure playing he mode to guide SPP modes .Where the confinement follow the order in sub-wave length scale of the width hole in silver and limited by the attenuation length (skin depth).Item Temperatureeffect Ofelectricalproperties Of Cigs Solar(University of Eloued جامعة الوادي, 2011-01-01) Ferouani, A. M.; Merad Boudia, M. R; Cheknane, A.; Benyoucef, B.In this paper we are interested in studying the copper–indium–gallium–selenium (CIGS) solar cells sandwiched between cadmium sulfide (CdS) and ZnO as buffer layers, and Molybdenum (Mo). Thus, we report our simulation results using the capacitance simulator (SCAPS) in terms of layer thickness, absorber layer band gap and operating temperature to find out the optimum choice. An efficiency of 20.61% (with Voc of 635.2mV, Jsc of 44.08 mA/cm2 and fill factor of 0.73) has been achieved with CdS used as buffer layer as the reference case. It is also found that the high efficiency CIGS cells with the low temperature were a very high efficiency conversion.Item Study Ofperformances Of Organic Solar Cellsbyanalysis Of Main Components(University of Eloued جامعة الوادي, 2011-01-01) Merad Boudia, M. R.; Ferouani, A. M.; Cheknane, A.; Benyoucef, B.The analysis of the data is currently, in the statisticians, the object of a true phenomenon of mode, characterized at the same time by the passion and the rejection.To determine the characteristics of a whole of data are obviously not an end in itself, but this lapse of memory is unfortunate because the type of data available always influences the direction of research.The factorial analysis in normalized principal components (PCA), is particularly adapted to the reduction of tables of measurements, where one generally works on a matrix of correlation between characters.In this article we will report our results of analysis of performances of organic solar cellsby using what one call the datamining materials.All information was presented in the tables envisaged by an ACP method of the studied semiconductors.Factorial analyzes substitutes for primitive measurements of new variables or factors (which are linear combinations of the primitive variables) with the help of which it is thus possible to optimize the visualization of the data in a restricted number of figures. Large at the modo we present, the results related to the development of new approaches of Datamining, Analysis in principal components (ACP), of the data-processing techniques which were applied to organic semiconductors and combined with metals to predict new materials or best performing coatings.Item Effect Of Roughness To Hydraulic Projection In An U-shaped Channel, With Rough Bed(University of Eloued جامعة الوادي, 2011-01-01) Ghomri, A.; Debabeche, M.; Riguet, F.This study aims to study the hydraulic jump controlled by threshold, moving in a channel profile 'U' bottomed rough for a single roughness. Functional relations in dimensionless terms, linking the different characteristics of the projection, showing the effect of roughness of the bottom of the channel are obtained.Item Analysis Of Induction Motor With Broken Bars And Constant Speed Using Circuit-field Coupled Method(University of Eloued جامعة الوادي, 2011-01-01) Halem, N.; Zouzou, S. E.; Srairi, K.The paper presents the use of the two-dimensional finite element method for modeling the three-phase squirrel-cage induction motor by using circuit coupled method. In order to analyze the machine performances, the voltage source is considered. The Ansys magnetic analysis software is used for calculating the magnetic field of an induction motor having a cage fault. The experimental results prove that the proposed approach constitutes a useful tool for the study and diagnostics of induction motors.