Ahmed Rezrazi, Oussama Taibaoui, Youcef Laribi

كلية العلوم والتكنولوجيا-جامعة الدكتور يحيى فارس بالمدية · الجزائر

L'objectif de notre travail est de faire une étude pratique utilisant logiciel Aspen Plus pour modéliser et simuler un système de refroidissement par absorption à simple effet qui fonctionne avec le couple Eau-Bromure de lithium (H2O/LIBR).Une étude paramétrique a été effectuée pour voir l’influence des températures de l’évaporateur,du bouilleur et du condenseur sur le coefficient de performance (COP) du système. Après cela, nous avons ajouté un échangeur de chaleur et observé son effet sur le coefficient de performanceet déterminer l’efficacité de l’échangeur. Tout cela dans le but de déterminer un meilleurfonctionnement du cycle. Ce programme d’optimisation est basé sur les équations de bilanmasse-énergie, les propriétés thermodynamiques et les propriétés physiques de la solution binaire (H2O / LiBr)

Abdelhamid Iratni, Hamza Saoudi, Islam Slimani

كلية العلوم والتكنولوجيا-جامعة محمد البشير الإبراهيمي - برج بوعريريج · الجزائر

Les moteurs asynchrones sont le meilleur choix pour une variété d'applicationsindustrielles, compte tenu de leur fiabilité, de leur robustesse et de leurs coûts de fabricationrelativement faibles. Le travail présenté dans ce mémoire vise à mettre en œuvre unetechnique d'estimation et d'identification des grandeurs de moteurs à induction. Dans lapremière partie, nous avons introduit la commande vectorielle des moteurs asynchrones, puisnous avons étudié le filtre de Kalman étendu pour estimer la vitesse du MAS. La deuxièmepartie est consacrée à l'identification des paramètres du moteur à induction basée sur latechnique d'optimisation par essaim de particules (PSO). Des simulations numériques ont étéréalisées sur Matlab pour vérifier la méthode

حاتم خالد عيدة, دينا محمد مصباح خضيرات

كلية المهن الصحية - العلوم الطبية المساندة-جامعة القدس · فلسطين

In recent years, Acinetobacter baumannii has received increasing attention due to its capability of acquiring multi-resistance to antibiotics and its potential to cause disease in humans. It is also known for its intrinsic antimicrobial resistance mechanisms. Several studies documented the increase in the percentage of resistance to antimicrobial agents in four major antimicrobial classes: fluoroquinolones, aminoglycosides, β-lactams including carbapenems. The increase in carbapenem resistance is of particular concern, as this class of antibiotics is usually considered the last choice in treating resistant A. baumannii. This opportunistic pathogen is able to survive in the environment under unfavorable conditions for prolonged periods, which contributes to its increased virulence. Thus, the hospital environment may serve as a reservoir for resistant A. baumannii strains, allowing easy spread in hospitals and serving as a source of nosocomial infections in patients, healthcare personnel, and visitors. Aims: This study aimed at the characterization of A. baumannii isolates from inpatients and hospital environments, to determine their antimicrobial resistance pattern, detect carbapenem-resistant A. baumannii (CRAB), and investigate genetic relatedness between isolates using the random amplification of polymorphic DNA (RAPD) typing technique. Methodology: In this study, a total of 24 clinical isolates were obtained from various clinical specimens such as wounds, blood, urine, eswabs, and sputum during the period April 1, 2023, to December 31, 2023, from Alia Governmental Hospital, Hebron, Palestine. The Vitek2 system was used for identification and antibiotic susceptibility testing. Concurrently, a total of 126 specimens were collected from different environments of the hospital and identified as A. baumannii using conventional identification methods and CHROMagar Acinetobacter selective medium. The isolates were tested for antibiotic susceptibility using the disk diffusion method. All isolates (both clinical and environmental) were tested for the presence of the blaOXA-51 gene using PCR. Finally, the genetic relatedness between isolates was determined using the RAPD typing technique. Results: Twenty-four clinical isolates and 29 environmental isolates were identified as A. baumannii. All isolates were confirmed by detecting the blaOXA-51-like gene. Among the environmental isolates, patients’ beds were the most contaminated site (20.6%, 6/29), while the largest number of clinical isolates was obtained from wounds (10 isolates: 41.7%). The majority of clinical and environmental isolates were collected from the intensive care unit (ICU). Multidrug-resistant A. baumannii (MDRAB) was detected in approximately 74% of clinical isolates and in 100% of environmental isolates. Co-trimoxazole (COT) was the most effective antibiotic against both clinical and environmental A. baumannii isolates. For other antibiotics, clinical and environmental isolates showed high resistance rates: 86.2% and 96.6% of environmental isolates were resistant to imipenem (IM) and meropenem (MEM), respectively, while clinical isolates had resistance rates of 72.7% and 77.3% to IM and MEM, respectively. Using the RAPD-PCR typing technique, four clusters (A–D) grouped more than one isolate, while the remaining isolates each had unique patterns. Some RAPD clusters included both environmental and clinical isolates. Conclusion and Recommendations: This study clearly suggests that the rate of MDRAB and CRAB is increasing and is an important cause of nosocomial infections. The genetic relatedness between clinical and environmental isolates and the detection of high rates of antimicrobial-resistant A. baumannii in various hospital environments suggest the potential role of the hospital environment, through various clinical activities, in the cross-contamination of A. baumannii infections, particularly in the ICU. These findings highlight the importance of identifying A. baumannii infections early and implementing strict infection control strategies. It is recommended that hospital wards be vigorously sanitized and disinfected periodically.

Amani Bensalem , Aya Ammari , Mohamed Bahache

كلية الرياضيات والاعلام الآلي-جامعة محمد بوضياف - المسيلة · الجزائر

VANET is considered one of the networks that will have a greatuse in the future, especially as it provides many services andapplications that help road users. But like other networks, it suffersfrom many faults. To overcome these faults, various fault tolerancestrategies must be used. In this paper we will talk about some of thefaults in the VANET and fault tolerance also we will present a faulttolerance strategy in this network.

حسين أحمد أحمد, زينب خلّوف

كلية الهندسة المعلوماتية-جامعة حمص · سوريا

Murat Gunduz, محمد خالد عمر

كلية الهندسة-جامعة قطر · قطر

The purpose of this project is to provide comprehensive analysis of the impacts of change orders in construction projects to improve the understanding of their impacts. This understanding would be helpful for the construction professionals to be able to take proactive measures to reduce their impacts. Literature review was performed to study previous related researches and to identify factors of change orders impacts.Based on interviews with professionals in construction industry, these factors were reduced to most prominent 16 factors. Questionnaire was conducted to collect information about the perception of change order impacts by construction professionals. 102 complete responses were analyzed by using Relative Important Index (RII) and Analytical Hierarchy Process (AHP). Analysis results present the most significant impacts factors of change orders were: increased project re-planning, increased in project management efforts, increased reworks/demolition works, loss of efficiency due to work interruption and delay of payments.The results of this project could lead professionals to better understanding of the impacts of change orders and take proactive measures to control and reduce their impacts.

أحمد بن قطاف, مريم بوعوينة, ياسمين بوعيسى

كلية العلوم الاقتصادية والتجارية وعلوم التسيير-جامعة محمد البشير الإبراهيمي - برج بوعريريج · الجزائر

تحضى حوكمة المؤسسات باهتمام كبير من المنظمات الدولية وعلى نحو خاص بعض الأزمات المالية المتكررة والتي عان منها الاقتصاد العالمي حيث كانت الحاجة ماسة للقيام ببحث يدرس مدى أهمية حوكمة تسيير مؤسسات الدعم في الجزائر. تعتبر حوكمة المؤسسات إحدى المتطلبات الجديدة للنهوض بالاقتصاد من خلال قدراتها على التوجيه ومراقبة سير أعمال مؤسسات وحل العديد من المشاكل التي تواجهها. كما قمنا بدراسة ميدانية إلى الوكالة الوطنية لدعم تشغيل الشباب والصندوق الوطني للتامين على البطالة الناشطين على مستوى ولاية برج بوعريريج لمعرفة مدى مساهمتها في تمويل المشاريع الناشئة في الجزائر كذلك فقط قمنا بإسقاط الأطراف وأبعاد الحوكمة على هيئة الدعم، وقد خلصت الدراسة إلى أن التطبيق الفعال للحوكمة يؤدي إلى حسن سير مؤسسات الدعم بطريقه أكثر كفاءة وفعالية.

Cherifa Ben Semoune, Fatima Zohra Ben Semoune, Oum Kelthoum Laghouiter

كلية التكنولوجيا-جامعة عبد الرحمان ميرة - بجاية · الجزائر

This research focuses on the valorization of medicinal plants from the Ghardaia region forcosmetic purposes. The main objective is to study the phytochemical properties of amaranth(Amaranthus sp.) and develop a cosmetic product based on its extracts. Various analyses wereperformed including phytochemical screening, quantification of proteins, phenolics, flavonoids,tannins, lipids, tocopherols, and sterols. Cosmetic products were formulated and evaluated for itsstability and sensory qualities. The results highlight the potential of amaranth in cosmetics due toits antioxidant, moisturizing, and skin-repairing properties.

K. Boukhetala, خالدي بودالي

كلية الرياضيات-جامعة العلوم والتكنولوجيا هواري بومدين - الجزائر · الجزائر

جميلة غربي, سمير خليفي

كلية الحقوق والعلوم السياسية-جامعة اكلى محند أولحاج - البويرة · الجزائر