Mederharhet Yassina, Titaouine Abdenacer

كلية العلوم والتكنولوجيا-جامعة محمد خيضر - بسكرة · الجزائر

Grâce au développement de l’électronique de puissance et de l’électronique de commande, il est aujourd’hui possible d’obtenir des machines asynchrones aussi performantes que des machines à courant continu. Parmi ces structures, la commande vectorielle du flux rotorique a été ces dernières années la voie de recherche la plus importante et la mieux adaptée aux exigences industrielles. Cependant cette structure reste très sensible aux variations des paramètres de la machine et nécessite la mise en place d’un capteur mécanique. La présente étude a pour objectifs de développer une structure de contrôle des machines asynchrones, capable de fournir une bonne dynamique du couple électromagnétique avec une robustesse contre les variations paramétriques sans aucun capteur. La DTC n’exige qu’une paire de comparateurs à hystérésis pour effectuer un contrôle dynamique du flux et du couple. Cependant cette stratégie présente aussi des inconvénients importants. D’une part, la fréquence de commutation n’est pas maîtrisée, l'ondulation du flux stator et du couple. Le premier objectif de cette thèse. On s’intéressera à la minimisation des pertes fer à travers des algorithmes basés sur l’intelligence artificielle, tel que la logique floue et les algorithmes génétiques. Le deuxième objectif est la amélioration du contrôle directe du couple (DTC) basé sur la modulation vectorielle ( DTC-SVM ) et la technique de la logique floue .Des simulations numériques sur Matlab/Simulink ont été implantées pour valider les méthodes proposées.

A. Debache, Wassima Ghalem

كلية العلوم الدقيقة-جامعة الاخوة منتورى - قسنطينة 1 · الجزائر

حسن محمد تيم, عالية صلاح مصطفى عساف

كلية الدراسات العليا -جامعة النجاح الوطنية · فلسطين

As the title indicates, this study sought to identify the role of the colleagues’ supervision in the professional development of teachers at UNRWA schools in the northern governorates of the West Bank as perceived by both male and female teachers. Furthermore, the study sought to find out the impact of the variables of sex, years of experience, college, location of school and place of residence on that role of supervision. To these two ends, the researcher developed a questionnaire to measure the role of colleagues’ supervision in the professional development of teachers at UNRWA schools in the West Bank’s northern governorates. The 62 item-questionnaire covered seven domains: implementation of teaching, planning, evaluation, leadership, classroom curricular and extracurricular activities, professional development and classroom management. The population of the study( 977 teachers) consisted of all UNRWA school teachers in the northern governorates of the West Bank: Nablus, Jenin, Qalqilya, Tulkarm, Fari’a and the Jordan Valley. The questionnaire, based on previous studies and literature, was tested for validity and reliability. Then the researcher administered it to a pilot sample of 80 teachers of both sexes. After testing it on this sample, the researcher introduced some modifications. After making the necessary revision, the researcher administered the final version of the questionnaire to a randomly selected sample of 340 teachers. However, 25 participants or 7.35% failed to complete and return the questionnaire. The sample of the study represented 32.24% of the population of the study. Of these, 119 teachers were males and 196 were females. To calculate the reliability coefficient, the researcher used Cronbach Alpha formula. It was found to be 97.4, a high reliability coefficient that would meet the research purposes of the study.After data collection and analysis, it was found that the role of the colleagues’ supervision in the professional development of UNRWA school teachers, as perceived by teachers, was very high: 83.99%. It was also found that supervision of colleagues contributed to the professional development of teachers in a number of domains: implementation of teaching, classroom management, classroom curricular and extracurricular activities, leadership, professional development, planning, and evaluation. All these domains achieved very high consistent scores. They were between 80.04%- 87.75%. Moreover, no differences were found in the means of responses of study participants towards the role of colleagues’ supervision in achieving teachers’ professional development, on the total score of the study, which might be attributed to the variables of sex, college, place of living, academic qualification and years of experience. However, there were differences which might be attributed to the variable of school location in favor of schools in the Jordan Valley and Nablus schools.In the light of these findings, the researcher suggests that UNRWA educational administration prepare programs, plans and basic policies which would serve to boost the use of colleagues’ supervision in the supervision process. She also suggests setting up foundations and criteria which would guarantee objectivity in colleagues’ supervision. Furthermore, the researcher recommends increasing interest in colleagues’ supervision in Jenin and Tulkarm areas to serve the objectives of the educational process there. Finally, the researcher recommends providing training for teachers on how to make supervision of colleagues, in terms of guidelines, and urging school headmasters to increase the use of colleagues’ supervision of different disciplines taught in schools for the benefit of the local communities.

فيصل أحمد , ياسر الحواس

كلية الهندسة-جامعة الإمارات العربية المتحدة · الامارات

The aim of this thesis is to develop a distributed adaptive control system which can work standalone for a single intersection to handle various boundary conditions of recurrent, non-recurrent congestion, transit signal priority and downstream blockage to improve the overall network in terms of productivity and efficiency. The control system uses link detectors’ data to determine the boundary conditions of all incoming and exit links. Four processes or modules are deployed. The traffic regime state module estimates the congestion status of the link. The incident status module determines the likelihood of an incident on the link. The transit priority module estimates if the link is flagged for transit priority based on the transit vehicle location and type. Finally, the downstream blockage module scans all downstream links and determines their recurrent blockage conditions. Three different urban incident detection models (General Regression Model, Neuro-Fuzzy Model and Binary Logit Model) were developed in order to be adopted for the incident status module. Among these, the Binary Logit Model was selected and integrated with the signal control logic. The developed Binary Logit Model is relatively stable and performs effectively under various traffic conditions, as compared to other algorithms reported in the literature. The developed signal control logic has been interfaced with CORSIM micro-simulation for rigorous evaluations with different types of signal phase settings. The proposed system operates in a manner similar to a typical pre-timed signal (with split or protected phase settings) or a fully actuated signal (with splitphase arrangement, protected phase, or dual ring phase settings). The control decisions of this developed control logic produced significant enhancement to productivity (in terms of Person Trips and Vehicle Trips) compared with the existing signal control systems in medium to heavily congested traffic demand conditions for different types of networks. Also, more efficient outcomes (in terms of Average Trip Time/Person and delay in seconds/vehicle) is achieved for relatively low to heavy traffic demand conditions with this control logic (using Split Pre-timed). The newly developed signal control logic yields greater productivity than the existing signal control systems in a typical congested urban network or closely spaced intersections, where traffic demand could be similarly high on both sides at peak periods. It is promising to see how well this signal control logic performs in a network with a high number of junctions. Such performance was rarely reported in the existing literature. The best performing phase settings of the newly developed signal control were thoroughly investigated. The signal control logic has also been extended with the logic of pre-timed styled signal phase settings for the possibility of enhancing productivity in heavily congested scenarios under a closely spaced urban network. The performance of the developed pre-timed signal control signal is quite impressive. The activation of the incident status module under the signal control logic yields an acceptable performance in most of the experimental cases, yet the control logic itself works better without the incident status module with the Split Pre-timed and Dual Actuated phase settings. The Protected Pre-timed phase setting exhibits benefits by activating the incident status module in some medium congested demands

Hadjer Zakez, Houari Zeggane , Redhouane Ghernaout , Rezkia Safia

كلية العلوم والعلوم التطبيقية-جامعة اكلى محند أولحاج - البويرة · الجزائر

En raison de la complexité du phénomène d’érosion - transport solide – envasement,dans le bassin de l'Oued Isser à cause de son importante hétérogénéité des sols, un faible couvert végétal et une grande variabilité spatio-temporelle du régime hydro-pluviométrique ; un modèle de puissance régressive (Qs=a* ) expliquant la variation du débit solide en suspension par le débit liquide (période 1971 à 1985) a été employé en subdivisant l’ensemble des données en groupes quotidiens (toutes les données), annuels, mensuels et saisonniers. Les relations en puissance mensuelles obtenues, expliquant la plus grande partie de la variance, ont conduit à interpoler, extrapoler et analyser les charges solides fines et grossières véhiculées par l’Oued Isser au droit du barrage de Koudiat Acerdoune. Les résultats obtenus montrent une variation remarquable de l’apport solide tant sur les valeurs intra-annuelles que celles interannuelles. L’exutoire du bassin versant au niveau du barrage de Koudiat Acerdoune recoit environ 2.969 MT (1.855Mm3) de matériau solide fin et grossier annuellement, soit une dégradation surfacique de 1065.957 T/Km2/an. Ces résultats alarmants permettent aux gestionnaires de l’eau et des barrages d’adopter des stratégies et des actions urgentes pour protéger les terres et préserver le potentiel du barrage de Koudiat Acerdoune

A. Hocini, Naima Mokhtari , Siham Merzougui

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

Une bonne gestion des ressources humaines, après un rapprochement d'entreprises, devient une nécessité pour le bon fonctionnement de cette dernière qui peut apporter des solutions dans la mesure où l'environnement est favorable à son application après plusieurs réformes

بعداش فارس, كاملي مراد

كلية الحقوق والعلوم السياسية-جامعة العربي بن مهيدي - أم البواقي · الجزائر

يمكن القول أن موضوع تنفيذ الأجكام الجنائية الدولية ينطوي على الكثير من الصعوبات والتعقيدات ،فهو في غاية التدقيق وينبغي في البداية التحقق من نهائية الحكم وسلامته من العيوب التي قد تؤدي إلى بطلانه ، وأنه لم يعتره أي إشكال قد يحول دون تنفيذه ، وأن تبدي إحدي الدول موافقتها على التنفيذ.إن المجكمة الجنائية الدولية وقصد ضمان تنفيذ أحكامها تنفيذا أمثل خص نظامها الأساسي بابا كاملا يتعلق بالتنفيذ كما أن المحكمة الجنائية الدولية ليس لها مؤسسات عقابية خاصة بها ، من هنا جاءت الحاجة إلى ضرورة وجود تعاون دولي في تنفيذ عقوبة السجن التي تحكم بها المحكمة ، وهذه الالية تجد محورها الأساسي في أن الدول الأعضاء يلتزمون بشروط معينة بإستقبال المحكوم عليهم بهذه العقوبات ، بحيث يقومون بتنفيذ العقوبات بمؤسساتهم العقابية وأن تضع هذه الدول في الحسبان أن الحكم وكأنه صادرا من محكمتها الجنائية الداخلية دون أي تفرقة أو وضع لعوائق قد تعرقا تنفيذه ، وهنا بالذات يبرز الدور الإيجابي للقضاء الداخلي في عملية التنفيذ.كما يقع على عاتق الدول الأعضاء تنفيذ عقوبات الغرامات المالية وإجراءات المصادرة التي يتم الحكم بها من المحكمة استناد إلى الفصل السابع من النظام الأساسي للمحكمة، وذلك بدون إخلال بحقوق الغير حسني النية ووفقا للقواعد الإجرائية المنصوص عليها في القوانين الوطنية للدولة التي تقوم بالتنفيذ ، وأن هذه العقوبات تلتزم كافة الدول بتنفيذها طالمت وجد علي إقليمها أموال خاصة بالمحكوم عليه ، ويتعين على هذع الدول أن تتخذ كافة الإجراءات اللازمة للحصول على قيمة الأشياء والأموال التي نتجت عن هذه الجريمة ، ثم تقوم بتحويلها إلى المحكمة .

Maged A. I. El-Shaarawi, ABDULAFEEZ ADEBIYI

كلية الهندسة-جامعة الملك فهد للبترول والمعادن · السعودية

This thesis presents the outcome of the performance test and economic analysis of a simple photovoltaic powered vapor compression refrigeration system conducted in the eastern province of Saudi Arabia. The system has a 66W DC refrigerator, 100W PV mono-crystalline module and a 100Ah battery bank. Two different approaches are adopted for ice production (bulk mass loading pattern and distributed loading pattern). For the bulk mass loading pattern, a bulk mass of 0.6kg of ice was produced after 6hrs and 50mins with a refrigeration COP of 0.20. While for the distributed loading pattern, the thermal loads were distributed in the refrigerator compartment using ice trays of 300ml each for a total mass of 2.1kg. The performance was greatly enhanced and a refrigeration COP of 0.60 was obtained as the system operates continuously without any interruption or fault for the entire time of the experiment and ice was completely formed after 6hrs and 40mins. The performance enhancement is due to larger area to volume ratio of the distributed mass loading pattern when compared to the bulk pattern. As a result the heat transfer rate is higher in the distributed pattern compared to bulk pattern. At the maximum solar radiation, best PV efficiency was calculated to be 15.5% and best solar panel orientation was calculated to be 99%. It was however observed from the cost analysis that the system would not be economical without government subsidy on the system components or alleviating the current subsidy on the price of electricity in Saudi

A. Chadi, F. Bouchenak, Lamia Ramdane, Lydia Cherouk Ifrek

كلية علوم الطبيعة والحياة-جامعة سعد دحلب - البليدة · الجزائر

Le présent travail porte sur l’isolement et la caractérisation des bactéries nodulant les légumineuses Lotus edulis, Lotus ornithopodioïdes, Vicia sativa et Trifolium hybridum poussant à l’état spontané. Nous avons choisi comme lieu d’échantillonnage la région de Blida dans le nord Algérien et les isolements ont été réalisés à partir de 102 nodules différents, afin d’évaluer et de caractériser la diversité phénotypique.L’étude des caractères morphologiques et culturaux et de la mobilité démontre que les bactéries isolées appartiennent au Rhizobia. La caractérisation phénotypique qui inclut des tests sur les différents milieux de cultures et la recherche des enzymes respiratoires montrent que les bactéries isolées à partir de l’espèce Lotus Ornithopodioïdes sont des Rhizobium, ou Sinorhizobium, ou Mesorhizobium. Le reste des isolats à croissance lente sont probablement du genre Bradyrhizobium, en particulier les bactéries isolées de l’espèce Lotus edulis ont donné une acidification sur le milieu GPA et une catalase négative, donc n’ont pas la même description que les Rhizobia.Cette caractérisation reste quand même insuffisante, mais elle nous informe sur la position taxonomique hypothétique des isolats traités dans cette étude.

سيف بن بخيت بن حمد, محمد بن طاهر ال ابراهيم

كلية الحقوق-جامعة السلطان قابوس · عمان

تهدف الرسالة التعرف على الحماية المدنية والإدارية للمال العام في التشريع العماني، وذلك بالإجابة على الأسئلة التالية :1. هل ساهمت القوانين والتشريعات الرقابية في تعزيز الحماية القانونية للمال العام فيسلطنة عمان ؟2. ما هي أوجه القصور والنقص في هذه التشريعات ؟3. ما هي المبادئ التي استقرت عليها محكمة القضاء الإداري في مجال الحماية القانونية . المقررة للأموال العامة، وكذلك الفتاوى القانونية الصادرة من وزارة الشؤون القانونية ؟4. هل هناك اختلافات جوهرية في مجال الحماية القانونية للمال العام في التشريعين العمانيوالمصري ؟وقسم البحث إلى فصلين سبقهما فصل تمهيدي تناول فيه التعريف بالمال العام وأنواع الحماية المقرر له، وبحث في الفصل الأول الحماية المدنية للمال العام في التشريع العماني، وفي الفصل الثاني الحماية الإدارية للمال العام في التشريع العماني.وتوصل البحث في خاتمته إلى أهم النتائج والتوصيات من خلال تناوله لهذا الموضوع.