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Sole P.,Telecom ParisTech | Sole P.,King Abdulaziz University | Yemen O.,Institute Preparatoire Aux Etudes DIngenieurs
Finite Fields and their Applications | Year: 2012

We present a study of the factorization of the polynomial X m-1 in M2( F2)[X] and we determine the period of any reversible polynomial of this polynomial ring by using skew polynomial rings. These results are applied to the construction of the class of quasi-cyclic codes Ω(P) introduced by Cayrel et al. Furthermore, we present a new construction of the self dual subclass. © 2012 Elsevier Inc. Source

Nejma F.B.,Institute Preparatoire Aux Etudes DIngenieurs | Slimi K.,Institute Superieur Du Transport Et Of La Logistique
Computational Thermal Sciences | Year: 2011

The present paper deals with a numerical simulation of a combined laminar forced convection and radiation in humid air flowing between two vertical plates. The left plate is assumed to be adiabatic and humid while the second is isothermal and dry. The governing set of conservation equations are solved numerically by the classical finite-volume method, while the statistical narrow band k-correlated model (SNBCK4) and the "ray-tracing" method are used to solve the radiative coupling problem. Our numerical results are compared with the most related available published works. Satisfactory agreement was obtained between our results and those of the literature. The effects of ambient conditions, channel width, dry wall temperature, and wall emissivity are also analyzed in this study. © 2011 by Begell House, Inc. Source

Zegnani A.,University of Monastir | Mhimid A.,University of Monastir | Dhahri H.,University of Monastir | Slimi K.,Institute Preparatoire Aux Etudes DIngenieurs
Journal of Porous Media | Year: 2010

A model approach for heat and mass transfers during gas sorption by a zeolite bed is developed. The mathematical modeling is based on assuming the bed to be formed with three phases-solid, liquid, and gaseous. The classical finite volume method is used to numerically solve the differential set of governing macroscopic equations. Numerical results provide us the time-space evolutions of temperature and moisture content. A comparison between results obtained with a three-phase model versus those obtained with a two-phase model is performed and discussed. A comprehensive analysis of the influence of the bed porosity and the grain porosity on the average reduced moisture content and average reduced temperature is also investigated. © 2010 by Begell House, Inc. Source

Ben Nejma F.,Institute Preparatoire Aux Etudes DIngenieurs | Slimi K.,Institute Superieur Du Transport Et Of La Logistique
High Temperatures - High Pressures | Year: 2010

This work deals with combined natural convection and radiation in a humid air flowing between two-isothermal vertical plates. The governing set of conservation equations in the dimensional form are solved numerically by the classical finite volume method. The radiative coupling problem is solved using the SNBCK4 model. Present solutions are compared with already known results from previous published works. An excellent agreement was obtained between results that validate the used computer code. It is shown that the existence of water vapor, even in small quantities, improves the heat transfer rate and increases considerably the evacuated flow rate. The influence of the wall's temperature, the duct's dimensions as well as the vapor molar fraction on the mean Nusselt number and flow rate is examined and discussed throughout this paper. © 2010 Old City Publishing, Inc. Source

Gaied W.,University of Monastir | Ben El Hadj Rhouma M.,Institute Preparatoire Aux Etudes DIngenieurs
International Journal of Quantum Chemistry | Year: 2011

The structure and stabilities of Ca2+Arn (n = 1-24) clusters are investigated using analytical potential functions. The energy of the systems, in its ground state, is described using additive potentials with V(Ca2+-Ar) and V(Ar-Ar) representing the pair potential interactions, and many-body effects are described using the interaction between dipoles induced by the calcium ion. To find the geometry of the lowest energy isomers of Ca2+Arn clusters, we use the so-called basin-hopping method of Wales et al. We show that in the equilibrium structures of Ca 2+Arn clusters, the Ca2+ cation is always solvated by argon clusters. For n = 2, we have found a strong competition between the symmetric linear shape (D∞) and the bent isomer (C2v). The relative importance of the three-body interactions due to the presence of the induced dipoles on the Ar atoms can be inferred from the magnitude of the known Ar2 interaction, and lead to a more stabilized linear structure. The global minimum of Ca2+Ar3 is planar (D3h), but a second three-dimensional isomer with a pyramidal C 3v symmetry exists. The absolute minimum of Ca2+Ar 4 is a regular tetrahedron, and that of Ca2+Ar 6, is a regular octahedron. The particularly stable sizes with respect to their immediate neighbors were studied by calculating the second energy difference between size n and its immediate neighbors. © 2009 Wiley Periodicals, Inc. Source

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