http://dspace.univ-chlef.dz/handle/123456789/1 Thu, 30 Apr 2026 11:18:58 GMT 2026-04-30T11:18:58Z http://localhost:80/bitstream/id/cfb8c3bf-4a38-48c7-83f2-f2bcd176fb7c/ http://dspace.univ-chlef.dz/handle/123456789/1 http://dspace.univ-chlef.dz/handle/123456789/2437 Computer-Mediated Communication as a Medium of TEFL for 1st Undergraduate Students in the English Language Department UHBC BENAIRED, Aissa This study examines the integration of Computer-Mediated Communication (CMC) in teaching English as a Foreign Language (EFL) to undergraduate students, with the aim of assessing its impact on learner engagement, autonomy, and communicative competence. Grounded in Moore’s Transactional Distance Theory (TDT), the research explores how CMC tools such as discussion forums, chat platforms, and collaborative digital spaces mediate psychological and communicative distance between learners and instructors in virtual and hybrid learning environments. Adopting Creswell’s mixed-methods research design, the study combines quantitative and qualitative data collection to provide a comprehensive understanding of CMC’s pedagogical effectiveness. Quantitative data were collected through questionnaires administered to teachers and students, measuring learner motivation, participation, and language performance. Qualitative data were obtained from platform observations and instructor reflections, offering deeper insights into classroom dynamics and instructional strategies. The findings indicate that CMC significantly reduces transactional distance by fostering more interactive, learner-centred experiences. This, in turn, enhances language acquisition and promotes self-regulated learning. Furthermore, the study identifies key pedagogical strategies for optimizing CMC use in EFL contexts, including scaffolding communication tasks, balancing synchronous and asynchronous tools, and sustaining cognitive presence. The study offers practical implications for curriculum development and teacher training, advocating for the thoughtful integration of technology to support meaningful and context-sensitive EFL instruction. A Thesis Submitted to the Department of English Language in Partial Fulfilment of the Requirements for the Degree of Doctor of Philosophy in Didactics of the English Language Thu, 01 Jan 2026 00:00:00 GMT http://dspace.univ-chlef.dz/handle/123456789/2437 2026-01-01T00:00:00Z http://dspace.univ-chlef.dz/handle/123456789/2436 الانتقاء الرياضي باستخدام أدوات الذكاء الاصطناعي عشيط هني, محمد الأمين This thesis aims to design an intelligent model based on artificial intelligence and machine learning techniques to guide football players towards optimal playing positions based on their physical and morphological characteristics. The study adopted a descriptive survey methodology, analyzing data from 938 players in the French League (Ligue 1 and Ligue 2) for the 2022-2023 sports season. Physical and morphological measurements were collected, and machine learning algorithms (KNN, SVM, Random Forest) were applied to classify players into positions based on physical metrics. The results revealed that the machine learning models were able to classify players with an accuracy ranging between 70.21% and 89.36%, with clear physical differences observed between various positions. Central defenders were characterized by height, strength, and jumping ability; midfielders excelled in endurance and agility; while attacking players were distinguished by speed, acceleration, and explosive power. The results also showed a slight superiority of the Random Forest algorithm in most classification scenarios. The study provides a practical framework that coaches and football academies can rely on to enhance sports selection and orientation processes Sat, 18 Apr 2026 00:00:00 GMT http://dspace.univ-chlef.dz/handle/123456789/2436 2026-04-18T00:00:00Z http://dspace.univ-chlef.dz/handle/123456789/2435 Design, optimization and energy performance of hybrid Photovoltaic-Thermal solar-assisted heat pump systems for buildings applications in Algeria BENCHAMMA, Sofiane The demand for solar-assisted heat pumps is increasing over time to meet human needs for home comfort, such as heating and domestic hot water, while maintaining lower costs. This trend aligns with the commitment of governments around the world, including Algeria, to provide clean renewable energy and move away from polluting fossil fuels that contribute to gas emissions. The energy source for operating a heat pump system can be single, such as solar energy alone or air energy alone or can be dual or multiple sources in same time, meaning the heat pump system operates using more than one source of energy, like solar energy and air. Solar heat pump systems are divided into two types. One is referred as the direct-expansion system, abbreviated as DX-SAHP, where the solar collector acts as the evaporator at the same time and the other type is referred as the indirect-expansion system, abbreviated as IX-SAHP, where the solar collector and the evaporator are separated from each other. The contribution of this study is to design and optimize a new dual solar-air heat pump system that can operate in directexpansion mode (DSM), or in indirect-expansion mode (ISM) and it can also operate in a third mode Direct/indirect-expansion (D/ISM). The objective is to investigate and compare the performance of the new system when operating in the three modes. First, a mathematical model for DX-SAHP system based on the fundamentals of thermodynamics and heat transfer is developed, validated and implemented in MATLAB. Then, a TRNSYS model simulating IX-DSHP system type is developed. In the third step, the two models are integrated to obtain the new DX/IX-DSHP system. Results show that when the system operates in D/ISM mode, it achieves better performances. The coefficient of performance is 2.89, the seasonal performance factor is 9.19 and the solar fraction is 63%. Whereas, they are 2.63, 6.23 and 51% in ISM and are 2.41, 3.76 and 29% in DSM. Parametric study indicates that the area of the solar collector, whether conventional thermal collector or photovoltaic thermal collector, has a direct effect on performance, while the set-point temperature of the tanks has a minimal impact. Economically, the D/ISM shows a shorter payback period compared to the other two modes if global energy prices are considered. The PBP is 7, whereas it is 8 and 9 in the ISM and DSM respectively THESIS Presented to obtain diploma of DOCTORATE Field : Mechanical Engineering Speciality : Energetics Sat, 11 Apr 2026 00:00:00 GMT http://dspace.univ-chlef.dz/handle/123456789/2435 2026-04-11T00:00:00Z http://dspace.univ-chlef.dz/handle/123456789/2434 تنفيذ قرارات التحكيم التجارية في القانون الجزائري قالم, أمينة Sun, 27 Apr 2025 00:00:00 GMT http://dspace.univ-chlef.dz/handle/123456789/2434 2025-04-27T00:00:00Z