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جامعة عمّار ثليجي – الأغواط

Université Amar Telidji de Laghouat

Archive ouverte de la recherche, des thèses et des cours pédagogiques
الأرشيف المفتوح للبحوث والمذكرات والدروس

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Faculty of Civil Engineering And Architecture
كلية الهندسة المدنية والمعمارية
Faculty of Economic And Commercial Sciences And Management Sciences
كلية العلوم الاقتصادية والتجارية وعلوم التسيير
Faculty of Human Sciences And Islamic Sciences And Civilizations
كلية العلوم الإنسانية و العلوم الإسلامية والحضارة
Faculty of Law And Political Science
كلية الحقوق والعلوم السياسية
Faculty of Letters And Languages
كلية الآداب و اللغات

Recent Submissions

Etude des cellules solaires minces et ultraminces
(Bibliothéque Centrale-Universite Laghouat, 2023) AbouElFath Hedibi; Mr GUEDDIM Ahmed Professeur UZA Djelfa Directeur de thèse
In this work, we have numerically studied two thin solar cells (even ultrathin) based on ZnO:Al/i-ZnO/ZnMgO/CZTS. We particularly focused on replacing the classic buffer layer at the CdS with the non-toxic and abundant ZnMgO material, in view of getting better performance. The influence of thickness, doping concentration and defect density of different layers of the two solar cells ZnO:Al/i-ZnO/ZnMgO/CZTS and ZnO:Al/i-ZnO/CdS/CZTS, as well as the interface defects density of ZnMgO/CZTS and CdS/CZTS, on the photovoltaic parameters of the cells studied was examined. Maintaining the optimal values of the different physical and geometrical parameters leading to the best efficiency, then we studied the influence of the gap energy Eg of the CZTS absorber layer and the RS and RSH resistances on the different photovoltaic parameters. The optimal efficiency corresponding to Eg  1.4 eV is 22.08 %, for the ZnMgO/CZTS cell and 23.64 % for the CdS/CZTS cell. Finally, a comparative study between our two cells was realized. The results have shown a large similarity of J-V characteristic and QE quantum efficiency. However, we note, the better performance of the ZnMgO/CZTS cell in the long wavelength region, the important region of the solar cell. Thus, it can be affirmed that ZnMgO would be a very good candidate to replace CdS considered until now as the most suitable material.
Etude ab-inition des propriétés physiques des nouveaux matériaux ternaires et quaternaires
(Bibliothéque Centrale-Universite Laghouat, 2020) Boulebda Hichem; Halit Mohamed Rapporteur Professeur Univ-Lagh
First-principles total energy calculations were performed to study the stability of Rh2TMSn (TM=Cr, Mn, and Fe) toward different magnetic ordering, ferromagnetic (FM), antiferromagnetic type I (AFM-I), and antiferromagnetic type II (AFMII). We studied the effects of electron correlation on the magnetic stability of the compounds in both cubic and tetragonal structures using density functional theory (DFT) within the generalized gradient approximation (GGA) and GGA+U. The results show that the electron correlation has an important role in determining the magnetic stability of the compounds. The magnetic stability obtained from GGA+U agrees well with the available experimental results. The thermodynamic stability of the three compounds shows that all the compounds are stable in both cubic and tetragonal structures. Using the energy difference method, we were able to calculate the exchange interactions and estimate the Curie temperature of the Rh2MnSn a compound in the cubic structure. For the study of the Heusler RhCoTMSn quaternary alloy (TM = Cr, Mn and Fe) we have substituted an Rh atom of the full-Heusler compound Rh2TMSn by the Co atom. we have presented a theoretical study of structural and magnetic properties of Rh CoTMZ (TM = Cr, Mn and Z=Sn, Sb) compounds. This study is conducted by FP-LAPW (Full Potential linearized Augmented Planes waves) method, in the frame-work of the density functional theory (DFT), which is implemented in the Wien2k calculation code. For the exchange and correlation potential, we have used GGA, LDA, GGA_mbj and LDA_mbj. First, we have studied the chemical stability of the four compounds in the cubic structure for the three types (I ,II and III). The optimized lattice parameters, bulk moduli and magnetic moments for the most stable type are calculated by the two approaches GGA and LDA. We have also studied the band structure and the density of state in order to know the value and the nature of the gap and to know how to classify them according to their electronic behavior using LDA_mbj approach. Keywords First-principles calculations · full Heusler alloys · magnetic stability · DFT · electronic properties · Wien2k
Evaluation of the Effectiveness and Safety of Non-Operative Treatment for Uncomplicated Acute Appendicitis in Adults at the mixed hospital in Laghouat over a period of six months : A Prospective Cohort Study.
(UNIVERSITY OF AMMAR TELIDJI LAGHOUAT Faculty of Medicine, 2026-07-16) Chennoufi Maria Anfal; Madni Khaoula
Title: Evaluation of the Effectiveness and Safety of Non-Operative Treatment for Uncomplicated Acute Appendicitis in Adults at the mixed hospital in Laghouat over a period of six months: A Prospective Cohort Study. Background: Appendectomy has long been the gold standard treatment for acute appendicitis. However, increasing evidence from randomized controlled trials suggests that non-operative treatment (NOT) based on antibiotic therapy may represent a safe and effective alternative for uncomplicated acute appendicitis (UAA) in carefully selected patients. This study aimed to evaluate the effectiveness and safety of NOT for UAA in adults at the Colonel Lotfi Mixed Hospital of Laghouat, Algeria. Methods: A prospective cohort study was conducted including 36 adult patients (≥15 years) diagnosed with UAA between August 20, 2025, and February 20, 2026. Diagnosis was based on clinical, biological, and radiological criteria (Alvarado score <7, leukocytosis <15,000/mm³, appendiceal diameter 6–10 mm, absence of appendicolith or complications). Patients received intravenous antibiotics for 48 hours followed by oral therapy to complete a 10-day course using one of two regimens: Protocol 1 (cefotaxime + metronidazole) or Protocol 2 (amoxicillin-clavulanate + metronidazole). Patients were monitored clinically and biologically during hospitalization, with follow-up at 1 and 6 months. Treatment failure was defined as the need for appendectomy during the initial hospitalization. Statistical analysis was performed using SPSS v27.0. Results: The mean age was 29.94 ± 13.41 years, with a male predominance (58.3%). The overall success rate of NOT was 77.8% (28/36), while 22.2% (8/36) required surgical intervention. Protocol 2 showed a higher success rate compared to Protocol 1 (85.7% vs. 66.7%), although the difference was not statistically significant (p = 0.236). Abdominal defense was the only factor significantly associated with treatment failure (p = 0.028). No severe complications were observed among successfully treated patients. Conclusion: Non-operative treatment appears to be a safe and effective first-line option for selected adults with UAA, with a success rate comparable to that reported in the literature. Careful patient selection, close monitoring, and prompt surgical intervention in case of failure are essential to ensure optimal outcomes. Larger multicenter studies with longer follow-up are required to validate these findings and establish standardized treatment protocols.
محاضرات في الحجاجيات
(2026) البخاري السباعي
محاضرات في اصول التفسير وقواعده
(2026) البخاري السباعي