Bendida Medjahed , Houcine Benammar

كلية العلوم التكنولوجية-جامعة عبد الحميد بن باديس مستغانم · الجزائر

Le stockage d'énergie thermique utilisant des matériaux à changement de phase (MCP) joue un rôleimportant dans le maintien du confort thermique et la réduction de la consommation d'énergie dans unbâtimentenraisondesacapacitéàabsorberetlibérerlachaleurdansdepetitesvariationsdetempérature. Dans cette étude, la performance thermique des murs a été étudiée en fonction de diversfacteurscommel'intégrationd'uneseulecoucheMCP,lepositionnementduMCPdanslemurcomposite,latempérature de transitionde phase etla chaleur de fusiondu MCP.Ce travail est basé sur six configurations de murs d'un bâtiment multicouche où nous modifions lespositions de la couche de matériau à changement de phase (MCP). Des investigations ont été menéespourtrois propositions MCPsurcinqconfigurations.La méthode utilisée dans ce travail de simulation numérique de la conduction de la chaleur à troisdimensions dans un mur de bâtiment multicouche, c'est la méthode des volumes finis avec un delogicielANSYS18.0.L’objectifdetravailestfaituneétudenumériquedelaperformancethermiquedesmursavecl’intégration d'un matériau à changement de phase (MCP), puis changer le matériau à changement dephase (MCP) et connaître leur effet sur la répartition de la température et puis effet de la position desmatériaux à changement de phase (MCP) dans le mur sur la répartition de la température. pourlecas de mur à deuxdimensions aientbienlaréalitéphysique.Motsclés:Murdubâtiment,LogicielANSYS18.0,Régimestationnaire,Matériauxàchangementdephase(MCP), Température. study of the thermal performance of walls with (PCM) Abstract: Thermal energy storage using phase change materials (PCMs) plays an important role in maintainingthermal comfort and reducing energy consumption in a building due to its ability to absorb and releaseheat in a building. small variations in temperature. In this study, the thermal performance of the wallswas investigated as a function of various factors such as the integration of a single MCP layer, thepositioningoftheMCPinthecompositewall,thephasetransitiontemperatureandtheheatoffusionofthe MCP.This work is based on six configurations of walls of a multilayer building where we modify thepositions of the layer of phase change material (PCM). Investigations were carried out for three MCPproposalsonfive configurations.The method used in this work of numerical simulation of three-dimensional heat conduction in amulti-layered building wall is the finite volume method with a structured mesh by application ofANSYS18.0 software.The work objective is made a digital study of the thermal performance of the walls with the (PCM), (PCM)andknowtheireffect on the distribution temperature and then the effect of the position of the phase change materials(PCM) in the wall on the temperature distribution. The analysis shows that the results for the two-dimensional wallcasedo have physicalreality. Keywords :Building wall, ANSYS18.0 software, Stationary regime, Phase change materials(PCM),Temperature

دعاء رهيف لهو الزيادي, علي فرحان جواد

كلية التربية للعلوم الانسانية-جامعة المثنى · العراق

Fatma Abdelrahim Faisl Altegany, Mohammed Ali Bashir

كلية العلوم-جامعة السودان للعلوم والتكنولوجيا · السودان

In this thesis the variational iteration method is implemented to give exact solutions forseepage flow derivatives in porous media. A correction functional for the fractional partialequation is well constructed by a general Lagrange multipliers which can be identifiedoptimally via variational theory. Some examples are given and comparisons are made withthe Adomian Decomposition Method (ADM).The comparisons show that the method is veryeffective ,convenient and overcome the difficulty arising in calculating Adomianpolynomials andwe have solved seepage flow derivatives in porous media by using theAdomian Decomposition method(ADM). Our solution proved rapid convergence to the exactsolution.

رحيمة بوذراع, سميرة براهمية , صليحة سعايدية

كلية العلوم الإنسانية والاجتماعية-جامعة 8 ماي 1945 قالمة · الجزائر

سالي ضيف الله, محمد عبدالله آدم المليح, هنادي عبدالرحمن إبراهيم مصطفى

كلية هندسة وتكنولوجيا الصناعات-جامعة الجزيرة · السودان

The main objective of this project is to study the effect of the fiber dispersion in single mode fiber and show how it can compensate. In order to achieve the objectives of the project, we studied and stimulated the phenomenon referred to as group-velocity dispersion (GVD) in Single-Mode Fibers and shown how dispersion of the pulse limits the distance because the receiver must recover an unstable signal. The ability of the receiver to do this varies quite a lot with the design of the receiver itself and with the communication protocol. This casing a signal degradation and make it spreads and broaden along the distant and that lead to reduced the system performance; then shown how we can control and manage this effecting. the OptiSystem Software was used to demonstrate the influence of the (GVD) on Gaussian pulse propagation, and shown how the single was broadened; then compensate of this dispersion and single broaden with Ideal dispersion components. After the most major important factor was set like bit rate equal to 40 GB/S, which correspond to bit duration of 25 ps; and using the default value of 0.5 for “width” of the Optical Gaussian Pulse Generator and the resulting FWHM of the pulse is 12.5 ps.Then calculated the dispersion length which was 2.812km and set it at the fiber properties and disable all the effects except GVD and the project calculated under these values, the obtained result shown that the pulse was broaden (the peak power decreased). Then changed the fiber length to (10 km) and calculated the project the result shown that how the signal broaden and the width of the pulse increased approximately four time; Then added the Ideal dispersion compensation component to the design and set the dispersion parameter to (- 160 ps/nm) and calculated the project; the result shown that how compensation of accumulated dispersion was achieved. In this project, the properties of optical fibers are discussed. When the GVD is considered, and shown how it affected the signal and reduced the system performance and limiting the transmission distant. Compensation necessary. However, dispersion compensation introduces additional loss and complexity to systems. This leads to various system configurations in terms of transmission fibers deployed

الزهرة ملاس, سعيد بوشنافة, مباركة طولي

مخبر الدراسات النقدية والأدبية المعاصرة -جامعة أحمد بن يحيى الونشريسي - تيسمسيلت-جامعة أحمد بن يحيى الونشريسي - تيسمسيلت · الجزائر

Lylia Chikhaoui, Salim Bacha, Sam Hocine

كلية العلوم الاقتصادية والتجارية وعلوم التسيير-جامعة مولود معمري - تيزي وزو · الجزائر

Vu l’importance capitale des technologies d’information et de communication et de l’e-Banking et ça propagation, les banques de la willaya de Tizi-Ouzou opte pour l’amélioration et à modernisation de ce secteur en terme d’avantage concurrentielle et de facilité d’utilisation qu’elles procurent à ça clientèles. On peut dire que le travail des banques à la promotion du service E-Banking porte ses fruits principalement pour les banques privées.La banque à distance constitue une réponse technique et stratégique à l’innovation technologique et aux nouvelles formes de concurrence dans l’offre bancaire Malgré les efforts fournis par les banques le développement de l’E-Banking reste faible et se confronte à quelques problèmes réglementaires, les habitudes culturelles restent l’entrave la plus importante.

البدوي عبدالباقي طلحة, بكري يوسف محمد نور, سناء إبراهيم محمد أحمد الحسين

كلية علوم المختبرات الطبية-جامعة الجزيرة · السودان

This study was done in Wad Madeni Greater Locality, Gazira State, for surveillance of Schistosoma.haematobium and Schistosoma.mansoni, from April 2016 to June 2016 to see the prevalence of the disease, the most affected gender, the affected age group and to see the most real able test for detection of Schistosoma species. The targeted population was citizens of the locality from both sexes and all age group except under five years old. Sample size was 100 samples of urine and 100 samples of stool. Four tests were used for detecting of species, wet preparation and sedimentation for eggs of S.mansoni, and sedimentation by centrifugation for detecting of eggs of S.haematobium, Two techniques were used to make count of eggs in samples, Kato-katz method for counting of eggs of S.mansoni. Filtration technique which was used for detection and counting of eggs of S.haematobium.The over all prevalence of infecting with Schistosoma species was 48%. The results were show that the most prevalent species was S.haematobium with prevalence of 40% and S.mansoni with prevalence of 8%. The eggs count for S.haematobium and S.mansoni were both in light, all eggs counting of S.haematobium were between (1-20), and all eggs counting of S.mansoni were between (1-99), which revealed that the intensity of infection among infected individuals was light. The most affected age group was school children between 10-14 years old. All affected individuals were males. This study recommended to do further studies with follow up program.

سمراء بحري, سميرة بشير شريف, عبدالباسط قلفاط

كلية العلوم الاجتماعية والإنسانية-جامعة الجيلالي بونعامة - خميس مليانة · الجزائر

Fadi Nasser, نهاد ابراهيم باشا, يوسف شبل

جمعية متخرجي الجامعة الامريكية في بيروت, كلية سليمان العليان لإدارة الأعمال -الجامعة الأمريكية في بيروت-الجامعة الأمريكية في بيروت · لبنان