https://dspace.univ-ouargla.dz/jspui/handle/123456789/3973 2026-04-03T19:10:27Z 2026-04-03T19:10:27Z GUERMITI Laid BENTEBBA Mohammed Tahar HADJOUDJA Mourad https://dspace.univ-ouargla.dz/jspui/handle/123456789/5654 2019-05-08T08:20:13Z 2013-01-01T00:00:00Z

Titre: CONTRIBUTION A L’AMÉLIORATION DE CERTAINES CARACTÉRISTIQUES DU BÉTON DE STRUCTURE A BASE DE SABLE DE DUNE CORRIGÉ ET RENFORCÉ PAR DES FIBRES MÉTALLIQUES Auteur(s): GUERMITI Laid; BENTEBBA Mohammed Tahar; HADJOUDJA Mourad Résumé: A height development in the construction sector has knower at Algeria during this last decade. However, the construction has usually confronted to two contradictory factors: reducing the coast and improving the quality. The availability of local materials like, the dune sand, who covers more than 60% of Algeria aria, can offer a good valorization in the construction sectors. Sand dune plays a very important role in the manufacture of concrete, but most researchers have found that this material has some disadvantages such as large shrinkage. The experience of most authors found that the addition of fibers to concrete and the substitution of a part of sand dune by river sad can reduced the shrinkage, increased the compression and tension resistance, and can also improve others proprieties like, porosity, ultrasonic velocity. Description: AST Annales des Sciences et Technologie

2013-01-01T00:00:00Z Mohamed Hafed BERREBEUH Djamel MENNOUCHE Samira CHOUICHA https://dspace.univ-ouargla.dz/jspui/handle/123456789/5649 2019-05-08T08:19:37Z 2013-01-01T00:00:00Z

Titre: Choix et validation d’un modèle de comportement pour le séchage convectif de la datte Deglet-Nour Auteur(s): Mohamed Hafed BERREBEUH; Djamel MENNOUCHE; Samira CHOUICHA Résumé: Drying being a physically complex phenomenon, the biological diversity of the foodstuffs and their natural heterogeneity make that the recourse for modeling means becomes of a major technico-economic interest. The currently available literature shows an abundance of work treating the modeling of food drying, but few authors were interested in knowledge or behavior models related to date fruits. The main objective of this work is to exploit some experimental results of Deglet-Nour date drying carried out on a pilot drier with perpendicular convective drying. Date samples were harvested from Oued-Righ area in the south-east of Algeria. To this end four model equations were retained, on the basis of former work available in literature, namely, (a) Page equation (b) Logarithmic Model (c) Model of Midilli (d) Two terms exponential Model. The experimental drying curves were fitted by a non-linear regression analysis using the CurveExpert software. Obtained results classified the two exponential terms as the best model which was, then, generalized on a range of drying temperatures between 35C and 70C.The parameters of the generalized model equation were smoothly correlated with the drying air temperature. In addition, the adopted range of validity was checked by the bibliographical data as being the interval of heat treatment ensuring the good quality of the final product. Description: AST Annales des Sciences et Technologie

2013-01-01T00:00:00Z Salima, GUERRICHA Smail, CHIHI https://dspace.univ-ouargla.dz/jspui/handle/123456789/5639 2024-06-03T10:35:44Z 2013-01-01T00:00:00Z

Titre: Calculation of electrical microfield distribution spatial derivative functions in plasma using the Monte Carlo simulation Auteur(s): Salima, GUERRICHA; Smail, CHIHI Résumé: In this work, the distribution functions of spatial derivatives of electrical microfield in plasma have been calculated, by using the Monte Carlo Simulation. These results have been compared with our previoused analytical calculations. The rapprochement between results is significant. Some of these functions properties have been deduced from our calculations. Description: AST Annales des Sciences et Technologie

2013-01-01T00:00:00Z Keltoum CHENINI Amal GHAZEL Mohammed Tayeb MEFTAH https://dspace.univ-ouargla.dz/jspui/handle/123456789/5641 2019-05-08T08:18:38Z 2013-01-01T00:00:00Z

Titre: Asymétrie et opacité des profils de raies dans les plasmas non optiquement minces Auteur(s): Keltoum CHENINI; Amal GHAZEL; Mohammed Tayeb MEFTAH Résumé: The spectral line shapes of the absorption and emission are very useful for the diagnosis of temperature and density in plasmas. The profiles of the spectral lines of plasmas are widened asymmetrically around the center of line, and this asymmetry is caused by several effects which as: the fine structure, the quadripolar Stark effect, the very high principal quantum number and the effect of opacity. The aim of this work is the study of asymmetry of the profiles of lines in no optically thin plasmas and the analysis of this asymmetry according to the thickness of the medium and the scattering angle of the radiation Description: AST Annales des Sciences et Technologie

2013-01-01T00:00:00Z