http://archives.univ-biskra.dz/handle/123456789/3805 2026-04-06T19:54:49Z 2026-04-06T19:54:49Z M.Amadji A.Maache L.bouakkar L.Bouaoune H.Mazouz http://archives.univ-biskra.dz/handle/123456789/3810 2019-05-06T09:22:27Z 2014-10-07T00:00:00Z

Titre: Wear Debris in Prothesis for Biomaterials Auteur(s): M.Amadji; A.Maache; L.bouakkar; L.Bouaoune; H.Mazouz Résumé: The total replacement of damaged or diseased synovial joints represents one of the greatest advances in orthopaedic surgery of the 20th century. Whereas replacements are available for the shoulder, ankle, elbow, knee, hip accounts particularly for the most surgical interventions. Currently in the world several thousand hip joints per year are replaced and all the implants consist of a sliding pair represented by a hard counterface, either metal or ceramic, and a softer polymer. Since the early of 1960’s, Ultra High Molecular Weight Polyethylene (UHMWPE) became the dominant polymer for bearing surfaces in orthopaedic surgery. However, generation of UHMPWE wear debris from bearing surfaces in patients still the major problem for the long term implants. Both volume and morphology of the wear particles are important to determine the response of the body to debris and subsequent effects on secure fixing. This paper presents a review of the type of particles which are the most frequently, found in biopsies of tissues from explanted prostheses. Indeed, the size and the amount of these debris are very important factors for a better understanding of wear processes in artificial joints. Real wear particles are also described in this paper.

2014-10-07T00:00:00Z D. Djari R.Manaa S.BENSAADA http://archives.univ-biskra.dz/handle/123456789/3809 2019-05-06T09:22:16Z 2014-10-07T00:00:00Z

Titre: OPTIMIZATION OF THE CONDITIONS OF MACHINING PARAMETERS BASED ON A CRITERION COMBINED BY GENETIC ALGORITHMS Auteur(s): D. Djari; R.Manaa; S.BENSAADA Résumé: In metal cutting processes, cutting conditions have an influence on reducing the production cost and time and deciding the quality of a final product. This paper deals with the multiple- objective optimization of machining conditions problem in order to optimize the time and production cost simultaneously. This method consists essentially of improving previous methods by introducing the Pareto technique for solving the multiple-objective optimization problem using Genetic Algorithm. This method has been used for single pass turning. A comparison between results obtained by the proposed approach and those obtained with the gradient and the simplex methods was carried out.

2014-10-07T00:00:00Z Mohammed KHATTAOUI Bachir ACHOUR http://archives.univ-biskra.dz/handle/123456789/3808 2019-05-06T09:07:27Z 2014-10-07T00:00:00Z

Titre: HYSTERESIS DU RESSAUT HYDRAULIQUE CONTRÔLÉ PAR SEUIL DANS UN CANAL RECTANGULAIRE Auteur(s): Mohammed KHATTAOUI; Bachir ACHOUR Résumé: A theoretical approach is proposed to compute the hysteresis of a controlled hydraulic jump by a broad crested sill in a rectangular channel, when the inflow is generated by a gate and by a standard spillway with an abrupt slope. The attention is focused on the calculation of both maximum and minimum inflow Froude number compatible with the formation of the hydraulic jump in the energy dissipator stilling basin. When the inflow is generated by a gate, the theoretical development shows that the inflow Froude number is linked to the relative sill height by a cubic equation which can be solved using trigonometric functions. When the inflow is generated by a standard spillway with an abrupt slope, the inflow Froude number and the relative sill are well defined by an involutive function.

2014-10-07T00:00:00Z S.BENSAADA M.T.BOUZIANE M.BENMACHICHE http://archives.univ-biskra.dz/handle/123456789/3807 2019-05-06T09:07:44Z 2013-10-07T00:00:00Z

Titre: COMPORTEMENT DILATOMETRIQUE ET CALORIMETRIQUE DE L’ALLIAGE AL-5.8%Zn-2.7%Mg SOUS L'EFFET DES TRAITEMENTSTHERMOMECANIQUES Auteur(s): S.BENSAADA; M.T.BOUZIANE; M.BENMACHICHE Résumé: The aim of this work is the demonstration of the effect of thermomechanical treatments on the properties of the alloy Al-5.8% Zn-2.7% Mg by thermal analysis techniques and calorimetry, which are methods of test widely used for research purposes and quality control. The effects of thermomechanical treatments on the two variables namely the coefficient of thermal expansion and heat capacity, we can provide further information for better understanding of the phenomena responsible for the thermodynamic behavior of the alloy. The results showed the one hand, there is great similarity between the linear coefficient of thermal expansion and heat capacity, and secondly the effect of plastic deformation is evidenced by changes in the shape of the curves from the rough. Similarly the kinetics of precipitation of η phase is accelerated in the case of samples homogenized and homogenized + distorted and accompanied by a shift in the temperature range to lower temperatures than those recorded in the case of the material state Gross .

2013-10-07T00:00:00Z