Mostaganem, Algeria
Mostaganem, Algeria

The University of Mostaganem is a university, located in Mostaganem, Algeria.Founded in 1978, it now has some 28,000 students and 830 teaching staff. The institution was formerly an institute of agricultural technology, set up in 1969.It comprises eight faculties and one institute, as follows:- Faculty of science and computing- Faculty of natural science- Faculty of science and technology- Faculty of arts and literature- Faculty of law and politics- Faculty of economics, commerce and management- Faculty of social science- Faculty of medicine- Institute of sport and physical education Wikipedia.

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Zhou Y.,Zhejiang Normal University | Gala S.,University of Mostaganem
Zeitschrift fur Angewandte Mathematik und Physik | Year: 2010

In this paper, some improved regularity criteria for the 3D viscous MHD equations are established in multiplier spaces. It is proved that if the velocity field satisfies, or the gradient field of velocity satisfies, then the solution remains smooth on [0, T]. © 2009 Birkháuser Verlag Basel/Switzerland.

Chaouch D.,University of Mostaganem | Guessasma S.,French National Institute for Agricultural Research | Sadok A.,University of Mostaganem
Materials and Design | Year: 2012

The present study aims at studying the influence of heat treatment on the mechanical performance of 42CrM04 steel. Heat treatment is conduced in a way to affect significantly the microstructure, more precisely the tempered martensite structure. Tempering temperature is varied between 200 and 600° C. Experimental testing includes the determination of tensile properties and hardness scores. The identification of the mechanical parameters associated to elastic-plastic behaviour is undertaken using Finite Element computation to quantify the effect of heat treatment. The predictions show that characterisation of the material behaviour can be approached using a bilinear hardening model. The tempering temperature has a significant effect on the yield stress and tangent modulus. © 2011 Elsevier Ltd.

Due to constant decrease in farmlands, it is important to identify the best lands useful for sustainable agriculture (productive and profitable agriculture that protects the environment and that is socially equitable). This requirement has resulted in the development of land suitability maps for agriculture by combining several factors of various natures and of differing importance. The integration of MultiCriteria Decision Analysis approaches (MCDA) in a Geographical Information System (GIS) provides a powerful spatial decision support system which offers the opportunity to efficiently produce these land suitability maps. Indeed, GIS is a powerful tool for analyzing spatial data and establishing a process for decision support. Because of their spatial aggregation functions, MCDA methods can facilitate decision making in situations where several solutions are available, various criteria have to be taken into account and decision-makers are in conflict (Dias et al., 2002). The parameters and the classification system used in this work are inspired from the FAO (Food and Agriculture Organization) approach dedicated to a sustainable agriculture. A spatial decision support system has been developed for establishing the land suitability map for agriculture. It incorporates the multicriteria analysis method ELECTRE Tri (ELimitation Et Choix Traduisant la REalité) in a GIS (ArcGIS) within the GIS program package environment. This approach has been tested on the area of Mleta in Algeria. A land suitability map for durum wheat has been produced. Through the obtained results, it appears that ELECTRE Tri method, integrated into ArcGIS 9.2 of ESRI, is better suited to the problem of land suitability for agriculture. The time saving during the development of the land suitability map for the agriculture of the durum wheat was considerable. The coherence of the obtained maps confirms the system effectiveness. © 2012 Elsevier B.V.

He X.,Zhejiang Normal University | Gala S.,University of Mostaganem
Nonlinear Analysis: Real World Applications | Year: 2011

The goal of this paper is to establish a Serrin-type regularity criterion in terms of pressure for Leray weak solutions to the NavierStokes equations in R3. It is proved that if the pressure belongs to L2(0,T;B. ∞,∞-1(R3)), then the weak solution is actually regular. This improves a result established in a recent work by the second author Gala (2011) [19]. © 2011 Elsevier Ltd. All rights reserved.

Salima A.,University of Mostaganem | Benaouda B.,University of Mostaganem | Noureddine B.,University of Mostaganem | Duclaux L.,University of Savoy
Water Research | Year: 2013

Marine algae Ulva lactuca (ULV-AC) and Systoceira stricta (SYS-AC) based activated carbons were investigated as potential adsorbents for the removal of hazardous cationic dyes. Both algae were surface oxidised by phosphoric acid for 2 and subsequently air activated at 600°C for 3h. Dyes adsorption parameters such as solution pH, contact time, carbon dosage, temperature and ionic strength were measured in batch experiments. Adsorption capacities of 400 and 526mg/g for Malachite green and Safranine O by the SYS-AC and ULV-AC respectively were significantly enhanced by the chemical treatments. Model equations such as Langmuir, Freundlich and Temkin isotherms were used to analyse the adsorption equilibrium data and the best fits to the experimental data were provided by the first two isotherm models. BET, FT-IR, iodine number and methylene blue index determination were also performed to characterize the adsorbents. To describe the adsorption mechanism, kinetic models such as pseudo-second-order and the intra particle diffusion were applied. Thermodynamic analysis of the adsorption processes of both dyes confirms their spontaneity and endothermicity. Increasing solution ionic strength increased significantly the adsorption of Safranine O. This study shows that surface modified algae can be an alternative to the commercially available adsorbents for dyes removal from liquid effluents. © 2013 Elsevier Ltd.

Ouinas D.,University of Mostaganem
Journal of Sandwich Structures and Materials | Year: 2012

Applications of assembly bonded technique have been extended currently to various industrial fields. Adhesively bonded joints are widely used in the aeronautics and astronautics industry as a result of their high strength and convenience in using the single-lap joint. The geometry of bonded single-lap joint is nonlinear and causes the eccentricity due to the non-collinear applied load, which conducts to a significant stress concentration at the extremities of overlap area, where the cracks may initiate. In this article, the finite element (FE) method is used to analyze the behavior of a bonded lap joint of aluminum adherend. The comparison of stress concentration factor and stress intensity factor of crack emanating from the circular and semi-circular notches are investigated. The single-lap bonded joints were analyzed to study the combined effect of the notch and the disbond as they pertain to joint strength and failure conditions. The results show that the stress concentration factor and stress intensity factor are affected by the negative disbond effect and their values are strongly proportional to its size. © The Author(s) 2012 Reprints and permissions:

Gala S.,University of Mostaganem
Mathematical Methods in the Applied Sciences | Year: 2010

In this paper, we consider the regularity criteria for weak solutions to the 3D incompressible magnetohydrodynamic equations and prove some regularity criteria which are related only with u+B or u-B. This is an improvement of the result given by He and Wang (J. Differential Equations 2007; 238:1-17; Math. Meth. Appl. Sci. 2008; 31:1667-1684) and He and Xin (J. Differential Equations 2005; 213(2):235-254). © 2010 John Wiley & Sons, Ltd.

Senouci K.,University of Mostaganem
Physica A: Statistical Mechanics and its Applications | Year: 2014

We investigate numerically the effect of non-linear interaction on conductance statistics in one dimensional disordered systems with δ peak potentials. It is shown that the non-linearity can either localize or delocalize the electronic states depending on its sign. For an attractive nonlinear interaction, we found that the mean conductance decays as L-γ. The exponent γ is found to be sensitive to the kind of the potential. It seems to be independent of the strength of the non-linearity in the case of disordered barrier potentials, while it varies with this strength for well and mixed potentials. The conductance probability distribution shows a deviation from its log-normal form (linear case) when the nonlinearity is increased and the fluctuations of conductance decrease indicating the delocalization of the eigenstates. © 2014 Elsevier B.V. All rights reserved.

Ouinas D.,University of Mostaganem
Journal of Reinforced Plastics and Composites | Year: 2010

Bonded composite patch repairs to metallic structures is receiving increased attention in the recent years. It offers various advantages over rivetted doubler, particularly for airframe repairs. This article presents the crack growth behavior of an edge cracked aluminum plate repaired using boron/epoxy composite patch. The effect of the size and location of this disbond on the tensile behavior of the repaired plate is investigated. An analysis procedure, involving finite element modeling of the cracked plate, adhesive, and composite patch, is conducted to compute the stress intensity factor. The results indicate that the crack growth rate is dominated by the stress intensity factor and the size of the pre-existing disbonds. Cracking of the plate and propagation of the disbond results in an increase in the patch deformation. © The Author(s), 2010.

Gala S.,University of Mostaganem
Nonlinear Analysis: Real World Applications | Year: 2011

In this paper, we establish a Serrin-type regularity criterion for the weak solutions to the micropolar fluid equations in R3. It is proved that, if the velocity field satisfies one of the following conditions: u∈L21-r(0,T;M2,3r(R3)) or∇u∈L22-r(0,T;M2,3r(R3)), or the associated pressure satisfies one of the following conditions: p∈L2 2-r(0,T;M2,3r(R3))or∇p∈L2 3-r(0,T;M2,3r(R3)), then the solution remains smooth on [0,T]. © 2011 Elsevier Ltd. All rights reserved.

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