Farida Allouane , Hanane Sklab, Massissilia Saoudi

كلية العلوم الإنسانية والاجتماعية-جامعة عبد الرحمان ميرة - بجاية · الجزائر

Cette recherche se focalise sur l’un des mécanismes d’insertion professionnelle des jeunes diplômés universitaires à savoir le DAIP

Aymen Hadjab, Younes Hadjab, Said Zergane

كلية التكنولوجيا-جامعة محمد بوضياف - المسيلة · الجزائر

La cavitation est un phénomène très complexe et difficile à définir. En effet, l'écoulementde cavitation se produit généralement dans un champ tournant (roues, inducteurs,ventilateurs, etc.) et la dynamique d'interface implique des interactions complexes entre lesphases liquide et vapeur, dans les ailettes d’une pompe centrifuge.A travers cette recherche, nous visons à étudier la formation de bulles d'air lors duphénomène de cavitation et à la méthode de traitement des ailettes de la pompe par lerevêtement métallique.الخلاصةالتجویف ظاھرة معقدة للغایة یصعب تحدیدھا. في الواقع ، یحدث تدفق التجویف عمومًا في مجال دوار (عجلات ، محاثات، مراوح ، الخ) وتتضمن دینامیكیات الواجھة تفاعلات معقدة بین مرحلتي السائل والبخار لمضخة طاردة مركزیة.نھدف من خلال ھذا البحث إلى دراسة تكوین فقاعات الھواء أثناء ظاھرة التكھف ، وإلى طریقة معالجة شفرات المضخةالمعطبة بطریفة التلبیس المعدنيAbstractCavitation is a very complex phenomenon that is difficult to define. This is becausecavitation flow generally occurs in a rotating field (impellers, inductors, fans, etc.) andinterface dynamics involve complex interactions between the liquid and vapor phases,Through this research, we aim to study the formation of air bubbles during thephenomenon of cavitation, and to what extent these bubbles can affect pumping machines andhow to get rid of this phenomenon.

هنا محمد محمود المصري

جامعة جرش · الاردن

Shadi Sam Najjar, بلال حمد

كلية مارون سمعان للهندسة والعمارة-الجامعة الأمريكية في بيروت · لبنان

Several studies are reported in the literature on the effect of transverse reinforcement on bond and anchorage characteristics of reinforcing bars in normal and high strength concrete specimens. Transverse reinforcement provides concrete with confinement

Dr. ESAM IBRAHIM WARRAG, Esam Ibrahim Warrag, Ghada Salih Altayeb

كلية الغابات-جامعة الخرطوم · السودان

A.seyal var. seyal (Talh tree) is considered as an important multipurposetree species in Sudan, and there is a great need for developing in vitropropagation methods for clonal propagation of elite cultivars.The aim of this study is to develop a direct micropropagation of A. seyalplantlets and test the effect of basal salt mix of MS medium and somegrowth regulators on shoot growth and root formation.Single node explants was obtained from mature tree of A. seyal and werecultured on Murasige and Skoog medium (1962). MS strengths, sucroseand glucose as source of carbohydrates, inositol, MS vitamins andmodified White vitamins (1939), adenine sulfate, activated charcoal andsilver nitrate are tested as experiments of basal MS media. The growthregulators, cytokinins and auxins are tested singly.The results show that 1.0x and 0.5x (full and half) strength of MS saltmix medium are the best basal salts for A. seyal, 2-3% w/v of sucrose;100mg/l inositol, asingle dose (1.0x) of MS vitamins; 40.0mg/l adeninesulfate; 2.0g/l of active charcoal and 1.0 and 5.0mg/l silver nitratearequite suitable for propagation of Talh trees.The addition of 1.0 or 1.5mg/l BA, 1.5 or 2.0mg/l kinetin, 1.5 or 2.0mg/lIBA, 1.5 or 2.0mg/l NAA are suitable concentrations for culture of singlenode explants of Talh trees.Excised shoot from in vitro explants were used for rooting. Differenttypes of MS strength were tested with different concentration of IBA.Rooting ability was achieved on ¼ MS medium with 0.5mg/l IBA(rooting 30%).

عائشة بنت محمد باحاذق

كلية العلوم-جامعة الملك سعود · السعودية

Issam Lakkis , Omar Bassam Hakla

كلية مارون سمعان للهندسة والعمارة-الجامعة الأمريكية في بيروت · لبنان

Oceanic eddies are ubiquitous in oceans and play a major role in several parameters that include ocean energy transfer, nutrients distribution and air-sea interaction. Typically, eddy detection algorithms are based on single physical parameter, geometrics or other handcrafted features. To achieve better performances, we aim to develop a new approach to fuse multi-variable features for eddy detection. We will investigate lumping satellite datasets of Sea surface height, Sea surface temperature, Salinity in addition to full model solution velocity field through the inclusion of information (correlation) between the datasets.

Mohamed Ould Mammar , Nawale Cheggaga, Ould Amrouche Said , Seyfeddine Ziani

كلية التكنولوجيا-جامعة سعد دحلب - البليدة · الجزائر

L'électricité solaire est vue comme étant une importante source d'énergie renouvelable. Le générateur photovoltaïque est une source caractérisée par un certain point de fonctionnement où la puissance générée est maximale. Ce point se dé place en fonction des conditions atmosphériques ; et un mécanisme de poursuite s'avère alors indispensable pour que le générateur photovoltaïque travaille avec une meilleure efficacité. Le but de ce mémoire est l'étude et la simulation de deux mécanismes de pour suite (Solar electricity is seen as an important source of renewable energy. The photovoltaic array is an unstable source of power. Since the peak power point depends on the cell temperature and the insolation level. A maximum peak power point tracking is then necessary for maximum efficiency. The aim of this Master thesis is to study and simulate two peak power point tracking methods, in order to make solar energy more efficient)

غير معروف, ليندا بهلول

جامعة باجي مختار - عنابة · الجزائر

Notre travail est basé sur l'étude de l'extraction un colorant cationique bleu de méthylène(avec la méthode classique) et des colorants anioniques acid yellow99 et acid orange10(application des plans d'expérie,ces) par membrane liquide émulsionnée(MEL) et mettre enépreuve son rendement d'extraction. les résultats obtenus montrent que le problème des eauxusées contaminées par les colorants peut être maitrisé en appliquant la technique d'extractionpar membrane liquide émulsionnée qui basé essentiellement sur la formation d'une émulsionE/H stable capable d'extraire les colorants étudies. les extraction utilisées sontle HDEHP et l'aliquat336, la SPAN80 comme tensioactif et le hexane et lecyclohexane comme diluant, le H2SO4 comme phase interne. Après optimisation desparamètres d'extraction, les rendements d'extraction obtenus sont de 99,98% pour l'acidyellow99 et plus de 99,9% en appliquant les plans d'expérience pour les deux colorants, de99,9% pour le bleu de méthylène avec la méthode classique.

سيف الدين محمد علي أحمد جاد كريم, عبد الباقى السيد على

كلية الدراسات العليا-جامعة السودان للعلوم والتكنولوجيا · السودان

Groundnut is considered one of the major oil seed crops, widely grown in tropical and subtropical regions of the world. Its multiple uses make it as an excellent cash crop for domestic market and for foreign trade as well. The low germination level and poor growth of the crop in some conditions due to plant pathogens and other causal agents is one of the factors behind low productivity. Considering the irrational use of synthetic pesticides to control various pests and diseases of the crops and their adverse effects on environment, natural habitats through their residual toxicity, this study which was conducted under laboratory conditions of College of Agricultural Studies “Shambat”, Sudan University of Science and Technology, aimed to investigate the effect of bee glue (Propolis) powder aqueous extract, potassium nitrate and their mixture on seed germination and some growth parameter of groundnut (Arachis hypogaea L.). Three concentrations of aqueous extract of Propolis powder, potassium nitrate solution and their mixing up, each of 5, 10 and 15% were used in addition to untreated control. The assessment of their effect on seed germination and plant health was recorded through the percentage of germination and their influence on growth parameters. The results revealed that all concentrations of the aqueous extracts of bee glue powder, potassium nitrate and their mixture increased invariably the seed germination and growth parameters compared to control. The increase in germination percent ranging from 33.33% due to 5% potassium nitrate concentration to 80% due to 15% aqueous extracts bee glue powder concentration compared to 6.67% untreated control. The highest concentration of bee glue powder extract (15%), mixture of Propolis and KNO3 (7.5+7.5%) and the KNO3 alone (10 and 15%), gave the highest increase in germination percent (80.00, 66.67 and 40.0%) respectively compared to the untreated control (6,67%) in day three after inoculation. Among the treatments tested that of Propolis at all concentration (5, 10 and 15%) was generally the most effective in increasing the germination of seeds and gave significantly the highest percent germination, 80.00, 73.33 and 66.67 % respectively than its equivalents potassium nitrate and their mixture. Also the results showed that application of all treatments gave pronounced increase in number of leaves and fresh and dry weight compared to control. Moreover, concentration of each Propolis powder aqueous extract as well as that of potassium nitrate and their mixture reacted differently regarding their effect on germination and growth parameters. Generally, the results showed that the treatments activity increase with increase in concentration. Likewise, the test crop differs in its response to the different concentrations of treatments. To my knowledge, the current results were considered the first of its kind in the Sudan and hence it is promising and encouraging using Propolis for enhancing germination and growth parameters in other crops.