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Analysis , sizing and manufacturing of an indirect circulation solar air collector for drying agri – food products
(University of Tlemcen, 2026-07-06) Bekkaye, Aymen; Bekhti, Adem
This work presents an experimental study comparing two indirect forced-convection solar air collectors designed for agricultural food drying: a conventional flat-plate solar collector (PSC) and an innovative solar collector equipped with flexible aluminum tubes (SCT), developed to enhance heat transfer. Experimental tests were conducted at the ETAP Laboratory of the University of Tlemcen under various solar radiation levels and airflow rates. The results showed that the SCT outperformed the PSC, providing an average air temperature increase of 2.30 °C and a 5.98% higher thermal efficiency. The collector was subsequently coupled with a drying chamber to form a complete indirect forced-convection solar drying system. Experimental investigations were carried out under real climatic conditions at the University of Tlemcen during June 2026 for both configurations (PSC and SCT). The experimental results confirmed the reliability of the system: the SCT achieved an outlet air temperature of 71.3 °C, compared with 54.8 °C for the PSC, corresponding to a temperature gain of 16.5 °C, and reached a maximum thermal efficiency of 55.4%, whereas the PSC achieved 33.8%. These findings demonstrate that integrating flexible aluminum tubes into solar air collectors is a simple, cost-effective, and efficient solution for enhancing the thermal performance of solar air collectors and improving the overall efficiency of solar drying systems.
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Study of design and fabrication of an indirect solar dryer
(University of Tlemcen, 2026-07-06) Benkou,Naila; Benkati, Bouchra
This work presents an experimental investigation of an indirect forced-convection solar dryer incorporating an innovative active-wall concept, in which the sun-facing wall of the drying chamber is replaced by a wall-integrated flat-plate air solar collector, enabling the recovery of solar energy otherwise lost through the dryer envelope. Two absorber configurations were tested: a flat-plate absorber and a tubular absorber integrating parallel rough-surfaced aluminium tubes. Laboratory tests demonstrated that the tubular configuration achieves a superior thermal efficiency of 72% versus 68% for the flat-plate design, with a more uniform temperature distribution and a broader optimal operating range. The complete solar drying system comprising the primary collector coupled with the active-wall chamber was subsequently tested outdoors at the University of Tlemcen in June, under real solar irradiance conditions, using banana slices and mint leaves as drying products. Outdoor experiments confirmed the operational feasibility of the system, with the primary collector delivering outlet temperatures of 54 °C and 72 °C for the flat-plate and tubular configurations respectively. However, the wall-integrated secondary collector exhibited a limited thermal contribution under the current serial airflow arrangement, as the pre-heated air arriving from the primary collector frequently exceeded the secondary absorber temperature, resulting in a net heat loss. A circuit inversion (Tamb → C2 → C1 → chamber) is proposed as a priority design improvement to address this limitation.
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انشاء وكالة ذكاء اصطناعي متخصصة في الأتمتة الذكية لأنشطة المؤسسات الاقتصادية
(university of tlemcen, 2026) Meziane,Mohamed abdellah
تهدف هذه المذكرة إلى دراسة مشروع إنشاء وكالة ذكاء اصطناعي متخصصة في الأتمتة الذكية لأنشطة المؤسسات الاقتصادية، كنموذج تكنولوجي حديث يسعى إلى تحويل أساليب العمل التقليدية إلى أنظمة ذكية مؤتمتة ترفع من كفاءتها وتنافسيتها. تناول الإطار النظري مفهوم الأتمتة الذكية والذكاء الاصطناعي وتطبيقاته في بيئة الأعمال، مع التطرق إلى واقعه في الجزائر وولاية تلمسان. واعتمدت الدراسة التطبيقية على التمويل الذاتي، وتمت دراسة السوق بأدوات منهجية شملت الملاحظة والمقابلة والاستبيان. كما تضمن مخطط الأعمال التحليل الاستراتيجي والمزيج التسويقي والهيكل التنظيمي، إضافة إلى الجانب المالي الذي كشف عن إيرادات متنامية وعتبة مردودية محققة منذ السنة الأولى وفترة استرداد لا تتجاوز سنة وستة أشهر. وخلصت النتائج إلى أن المشروع قادر على تحقيق قيمة مضافة حقيقية بوصفه من أوائل نماذج وكالات الذكاء الاصطناعي المحلية المتخصصة في خدمة المؤسسات الاقتصادية في الجزائر.
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Optimisation des procédés de soudure pour améliorer les caractéristiques mécaniques
(University of Tlemcen, 2026) Aouad, Abdelbasset
Cette étude présente une synthèse des procédés de soudage et de leur influence sur les propriétés mécaniques et la soudabilité des aciers utilisés dans les applications industrielles, notamment dans le secteur du transport pétrolier et gazier. Les principales techniques de soudage sont examinées : soudage par fusion, soudage à l’arc, soudage par points par résistance et soudage plasma, afin de mettre en évidence leurs principes, avantages et domaines d’application respectifs. Les propriétés mécaniques des métaux, telles que la résistance à la traction, la dureté et la ténacité, sont analysées en relation avec les transformations métallurgiques induites par les cycles thermiques du soudage. Une attention particulière est portée au concept de soudabilité, qui reflète l’aptitude d’un matériau à être assemblé sans apparition de défauts ni dégradation significative de ses performances mécaniques. Une analyse comparative des nuances d’acier utilisées dans la fabrication de pipelines est également réalisée, à partir de données relatives aux applications de Sonatrach, afin d’évaluer leur comportement en conditions de soudage. Les résultats soulignent la forte corrélation entre le procédé de soudage choisi, la microstructure résultante et les propriétés mécaniques finales du joint soudé. Ils confirment également qu'une sélection appropriée des paramètres de soudage est essentielle pour garantir l'intégrité structurelle et la fiabilité des structures en acier soudées, notamment les pipelines soumis à des conditions d'exploitation sévères. En conclusion, ce travail offre une compréhension synthétique des technologies de soudage et de leur impact sur les performances de l'acier, fournissant ainsi une base utile pour l'optimisation des procédés de soudage dans des applications industrielles critiques telles que la construction de pipelines.
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دور اﻟﺬﻛﺎء اﻻﺻﻄﻨﺎﻋﻲ ﻓﻲ اﻟﻘﻄﺎع اﻟﻤﺼﺮﻓﻲ - دراﺳﺔ ﺣﺎﻟﺔ اﻟﺒﻨﻚ اﻟﻮطﻨﻲ اﻟﺠﺰاﺋﺮي وﻛﺎﻟﺔ ﺗﻠﻤﺴﺎن (اﻟﻜﯿﻔﺎن)
(university of tlemcen, 2026-06-24) Benhamed,Chaimaa
ﺗﺘﻨﺎول ﻫﺬﻩ المذكرة دور اﻟﺬﻛﺎء اﻻﺻﻄﻨﺎﻋﻲ في ﺗﻄﻮﻳﺮ اﻟﻘﻄﺎع المصرفي، بحيث ﺗﻌﺘبر ﻫﺬﻩ اﻟﺘﻘﻨﻴﺎت الحديثة ﻣﻦ اﻷﺳﺎﺳﻴﺎت اﻟتيﻛﻤﺎ ساهمت في تحسين اﻷداء اﻟﺒﻨﻜﻲ، رﻓﻊ اﻟﻜﻔﺎءة اﻟﺘﺸﻐﻴﻠﻴﺔ، اﻟﺘﻘﻠﻴﻞ ﻣﻦ ﻋﻤﻠﻴﺎت اﻻﺣﺘﻴﺎل، ﺳﻠﻄﺖ اﻟﺪراﺳﺔ اﻟﻀﻮء ﻋﻠﻰ أﻫﻢ اﻟﺘﺤﺪت اﻟتي ﺗﻮاﺟﻪ اﻟﺒﻨﻮك في ﺗﺒني ﻫﺬﻩ اﻟﺘﻄﺒﻴﻘﺎت ﻣﻨﻬﺎ ﺿﻌﻒ اﻟﺒﻴﻨﺔ اﻟﺘﺤﺘﻴﺔ، ﻧﻘﺺ اﻟﻜﻔﺎءة اﻟﺒﺸﺮﻳﺔ المؤهلة، و ﻣﻦ ﺧﻼل دراﺳﺔ ﻫﺬا الموضوع في اﻟﺒﻨﻚ اﻟﻮﻃني الجزائري ﺗﻮﺻﻠﻨﺎ إلى مجموعة ﻣﻦ النتائج ﻣﻦ ﺑﻴﻨﻬﺎ اﻋﺘﻤﺎد اﻟﺒﻨﻚ ﻋﻠﻰ الخدمات اﻹﻟﻜتروﻧﻴﺔ في ﺗﺴﻬﻴﻞ ﻣﻌﺎﻣﻼﺗﻪ ﻣﺜﻞ: اﻟﺒﻄﺎﻗﺎت اﻟﺒﻨﻜﻴﺔ و اﻟﺪﻓﻊ ﻋبر اﻷﻧترﻧﺖ اﻟتي ﺗﻮﻓﺮ اﻟﻮﻗﺖ ﻟﻌﻤﻼﺋﻪ و ﻛﺬﻟﻚ أﻃﻠﻖ ﺗﻄﺒﻴﻖ ﻳﺴﻤﺢ ﺟﺮاء المﻌﺎﻣﻼت اﻟﺒﻨﻜﻴﺔ ﻋبر الهاتف ﺗﻘﻠﻞ المخاطر، و ﻛﻤﺎ توصلنا إلى أن اﻟﺒﻨﻚ ﻻ ﺗﺘﻮﻓﺮ ﻓﻴﻪ ﻣﻈﺎﻫﺮ اﻟﺬﻛﺎء اﻻﺻﻄﻨﺎﻋﻲ المتقدمة..