فضة حسن, مقراني النعاس, هجرسي عبد الرحمان

كلية الحقوق والعلوم السياسية-جامعة زيان عاشور - الجلفة · الجزائر

Imene Mzaad, كيرا بشار

كلية علوم الطبيعة والحياة-جامعة زيان عاشور - الجلفة · الجزائر

Le développement durable est un sujet d'une importance croissante ces dernières années, la présente recherche vise à apporter un éclairage sur la manière dont sont pris en compte, sur le terrain, les enjeux du DD dans le processus de réalisation des nouveaux ensembles urbains périphériques en illustrant la situation avec le cas du « pôle urbain » de la ville de Médéa. Il a été montré, à travers l’étude les données et les observations que les enjeux du développement durables sont bien présents dans les principes d’aménagement et les recommandations des rapports urbanistiques. Toutefois, les objectifs escomptés n'ont pas été atteints et les résultats sont mitigés. La volonté de prise en compte des enjeux du DD se heurte aux conditions difficiles et à la réalité complexe du terrain.

Layan Yousef Azem, Mowafa Househ

كلية العلوم والهندسة-جامعة حمد بن خليفة · قطر

Loneliness is a complex emotion with potential associations with digital technology and social media usage. Understanding this association can help identify ways to leverage technology to reduce the negative impact of loneliness. This study aims to examine the relationship between digital technology use and loneliness by conducting a scoping review and analysing tweets from the Gulf Cooperation Council (GCC) to explore common emotions and themes. Objective The purpose of this study is to explore the emotions associated with loneliness by analysing people’s tweets, to gain a better understanding of loneliness and find ways to reduce it. It seeks to compare findings from the scoping review and the GCC tweet analysis, with the ultimate goal of creating a global loneliness map. Methods A scoping review was performed using the Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) process to analyze 33 studies published between 2015 and 2023. For the empirical study, 40,000 tweets from the GCC, retrieved in five different languages, were subjected to sentiment analysis using the Valence Aware Dictionary for Sentiment Reasoning (VADER). Results From the tweet analysis, word clouds were generated to visualize the topics associated with positive and negative sentiment categories. Tweets with negative sentiment were further analyzed to identify correlations between loneliness and socioeconomic and emotional themes. These emotions and themes were compared to the themes identified using the scoping review, and some of the common emotions include anxiety, depression, social connectedness, quality of life, and insomnia. Conclusion People use technology and social media to connect with others, and by analysing these types of interactions, such as tweets, we identify certain emotions that allow us to understand loneliness better. These results provide a foundation for the development of a global loneliness map, enabling stakeholders to better understand and address this complex issue and to allocate resources efficiently. This research offers a valuable contribution to the existing literature on loneliness, highlighting the need for further exploration of this topic in various contexts and regions.

Barry Quinn, Jolly Peter Isaac, Shaikha Al Maazmi

كلية التمريض والقبالة-جامعة محمد بن راشد للطب والعلوم الصحية · الامارات

Introduction:This paper presents a systematic literature review as part of an MSc program in specialist nursing. The review focusses on exploring the experiences of the Internationally Educated Nurses (IENs) with the cultural differences and its impact on the communication when working in a clinical setting which is different from their home country. The paper will begin by setting the chosen topic in context, giving some background to the important role IENs play in health and social care. The paper will then describe the methodology including the review design, the search strategy, the inclusion and exclusion criteria, the data bases accessed, the key search words and terms used. The paper will present the findings including the articles chosen to be part of the review, the overall results from these articles, which will be presented through a Preferred Reporting Items for Systematic Reviews and Meta-Analyses flowchart (PRISMA) and a table. Having critically reviewed, appraised, and assessed the quality of the articles and the findings. The common themes which they are 1. Need for support, 2. Communication, 3. Adjustment and they will be discussed in detail. The limitations and strengths of the review will be addressed and implications for practice will be presented.

Djalila Adjadj, khadidja Titi

كلية الأداب واللغات-جامعة العربي بن مهيدي - أم البواقي · الجزائر

This study seeks to investigate teachers' and learners' attitudes towards the role of third year secondary school course book texts "New prospects in learning english vocabulary ,ie, whether or not these texts are helpful in acquiring new lexical items ,whether or not they suit the learners' levels, interests and meet the teachers' expectations. To this end, two questionnaires are designed and administered. The first one was given to 40 third year secondary school pupils of both literary and foreign languages and scientific stream to identify their attitudes towards the texts and their effect on learning vocabulary. The second questionnaire was distributed to 20 teachers in four secondary schools in Oum-El-Bouaghi, to investigate their views concerning these texts. The results obtained reveal that the course book texts are useful, they help learners acquire new vocabulary items since each text deals with different topic and contains a lot of items. However most pupils have difficulty in understanding these items and prefer to have their explanation after the text . In addition, these texts are beneficial and attractive because they motivate learners .The discussion of the results show that both teachers and learners prefer short texts because they are not time consuming. On the basis of what has been mentioned before, the course book texts are considered helpful in learning english vocabulary since they suit the learners' level, interests and fit the teachers' expectation.

أميمة بوعويرة, حليمة كباهم , لخضر أوصيف

كلية العلوم الاقتصادية والتجارية وعلوم التسيير-جامعة محمد بوضياف - المسيلة · الجزائر

نسعى من خلال هذه الدراسة إلى التعرف على أشكال وتطبيقات عقد المشاركة في البنوك الإسلامية ومحدداتها، ومدى أهميتها في تمويل المشاريع الاستثمارية؛ والمساهمة في تحقيق التنمية الاقتصادية والاجتماعية في مجتمعات الدول العربية والإسلامية. حيث تم التوصل إلى أن هذه الصيغة؛ تعتبر الأكثر استخداما مقارنة بصيغ التمويل الأخرى. لدى العديد من البنوك الإسلامية، ومجموعة البركة المصرفية على الخصوص.

Boumehres A., بوبكر بن عطالله, محمد موسوي

كلية علوم الطبيعة والحياة-جامعة زيان عاشور - الجلفة · الجزائر

Les zoonoses sont des maladies et/ou infections qui se transmettent naturellement des animaux vertébrés à l’homme et vice-versa.Le présent travail apporte les données statistiques concernant trois zoonoses majeures (Brucellose, tuberculose et la rage), que ce soit chez l'animal ou l'Homme durant la période étalée entre 2010-2021 au niveau de la wilaya de Djelfa. Le présent travail est une enquête réalisée auprès des services de la direction de la santé et de la population et la direction des services agricoles de la wilaya de Djelfa. Cette enquête a révélé que la brucellose, la tuberculose et la rage restent des maladies d'actualité dans notre région avec ; 23001 cas de brucellose humaine et 3518 cas de tuberculose humaine entre 2010-2021 et 1078 cas pour la rage chez les humains seulement pour l'année 2021.Des mesures préventives, le respect des règles d'hygiène et une bonne collaboration entre les services de la santé publique et vétérinaire, concernant l'échange des informations épidémiologiques sur les zoonoses restent nécessaires pour maitriser ces maladies à la fois couteuses et dangereuses

Pinnau, Ingo, Swaidan, Ramy J.

جامعة الملك عبدالله للعلوم والتقنية · السعودية

To date there exists a great deal of energetic and economic inefficiency in the separation of olefins from paraffins because the principal means of achieving industrial purity requirements is accomplished with very energy intensive cryogenic distillation. Mitigation of the severe energy intensity of the propylene/propane separation has been identified as one of seven chemical separations which can change the landscape of global energy use, and membranes have been targeted as an emerging technology because they offer scalability and lower capital and operating costs. The focus of this work was to evaluate a new direction of material development for the very industrially relevant propylene/propane separation using membranes. The objective was to develop a rational design approach for generating highly selective membranes using a relatively new platform of materials known as polyimides of intrinsic microporosity (PIM-PIs), the prospects of which have never been examined for the propylene/propane separation. Structurally, PIMs comprise relatively inflexible macromolecular architectures integrating contortion sites that help disrupt packing and trap microporous free volume elements (< 20 Å). To date most of the work reported in the literature on this separation is based on conventional low free volume 6FDA-based polyimides which in the best case show moderate C3H6/C3H8 selectivities (<20) with C3H6 permeabilities too low to garner industrial interest. Due to propylene and propane’s relatively large molecular size, we hypothesized that the use of more open structures can provide greater accessibility to the pores necessary to enhance membrane sieving and flux. It has been shown for numerous key gas separations that introduction of microporosity into a polymer structure can defy the notorious permeability/selectivity tradeoff curve and induce simultaneous boosts in both permeability and selectivity.The cornerstone approach to designing state of the art high performance PIM-PI membranes for the light gas separations involving maximizing the intra-segmental rigidity of the polymer chain was applied to the C3H6/C3H8 separation. A study regarding a stepwise maximization of intra-molecular rigidity and its effects on C3H6/C3H8 permeation was evaluated by conducting systematic structural modifications to high performance PIM-PIs. State of the art increases in performance were observed in pure-gas measurements as there were significant increases in C3H6/C3H8 selectivity and C3H6 permeability upon doing so. However, mixed-gas measurements showed that there were 65% losses in selectivity due to competitive sorption and mainly plasticization. Based on the conclusions drawn, a fundamental departure from conventional PIM design principles was used, instead emphasizing enhancing inter-chain interactions by introduction of a flexible diamine and functionalization with hydroxyl groups to attempt to immobilize the polymer chains. In doing so, the polymer chains may be able to pack more efficiently and upon sub-Tg annealing cause a microstructural reorganization to form a coplanarized configuration due to the combination of inter-chain charge transfer complexes (CTC) and hydrogen bonding networks. This approach successfully mitigated plasticization, but more importantly resulted in a tightening of the microstructure, especially in the ultra-microporous range (<7 Å) thereby yielding significant boosts in C3H6/C3H8 selectivity. Based on the PIM platform and novel polymer design approach thereof, the C3H6/C3H8 upper bound was thrust to new limits and led to the generation of the most selective solution processable polymers reported for the C3H6/C3H8 separation.Although the PIM platform has redefined the polymer upper bound, the permeability/selectivity tradeoff still endures, as the C3H6 permeabilities were on the order of 1 to 3.5 Barrer for the most selective polymers. To bridge that gap in permeability, several different approaches were taken. For the first time attempted for C3H6/C3H8 separation, high temperature heating of a PIM-PI to form thermally-rearranged and carbon molecular sieve membranes was employed. The TR membrane showed increased C3H6 permeability and about 50% losses in C3H6/C3H8 selectivity, while the CMS membrane formed at 600 oC showed modest gains in C3H6/C3H8 selectivity with significant improvements in C3H6 permeability.Finally, hybrid nanocomposite membranes incorporating a metal-organic framework structure into a PIM-PI matrix was used. ZIF-8, which has demonstrated high diffusive selectivities for C3H6/C3H8, was dispersed within the polymer, since previous work by the Koros group indicated that its incorporation into polyimide matrices can facilitate major improvements in both C3H6/C3H8 selectivity and C3H6 permeability compared to the respective neat polymer. Focus was directed towards attempting to improve polymer/nanoparticle adhesion by enhancing the interactions between the polymer and filler particles to mitigate the interfacial defects notorious in mixed-matrix membranes (MMM). To do so, ZIF-8 was dispersed into one of the best performing hydroxyl functionalized PIM-PI for the C3H6/C3H8 separation. The highest loaded mixed-matrix membrane in a glassy polymer to date of 65% (w/w) was achieved. The membranes showed pure-gas selectivities ranging from 34 with 10 Barrer at 30% loading to 43 with 38 Barrer at 65% loading. Strong performance and plasticization resistance were sustained in mixed-gas experiments even to feed pressures approaching the vapor pressure of the C3H6/C3H8 mixture, as selectivities well over 20 were achieved with high permeabilities, thereby demonstrating the potential commercial viability.Based on the work reported in this dissertation, we hope to help lay a framework to be able to tailor membrane performance and future membrane design to meet the demands of the different applications of the propylene/propane separation and hence show that there can be a marketplace for membranes in the separation. These include the debottlenecking of cryogenic distillation towers for production of polymer-grade propylene (99.5%) to reduce the associated extensive energy load, production of chemical-grade propylene (92-95% propylene), or for the recovery and recycling of olefins from reactor purges of petrochemical processes.

أمحند برقوق, منور روابح

كلية العلوم السياسية والعلاقات الدولية-جامعة الجزائر 3 - إبراهيم سلطان شيبوط · الجزائر

Ahmed Bouzidane, Ilyes Bekheira

كلية العلوم التطبيقية-جامعة ابن خلدون – تيارت · الجزائر

L’un des scénarios catastrophiques pour les machines tournantes est la cassure des lignes d’arbres, sous l’effet de la propagation des fissures non détectées. La dynamique du rotor s’intéresse à l’étude du comportement vibratoire des machines tournantes afin. Dans ce mémoire on a traité un cas de rotor fissuré par la méthode Jeffcott et la méthode des éléments finis où on s’intéresse à l’étude du comportement vibratoire d’un rotor flexible qui contient un disque au centre supporté par des paliers rigides en régime transitoire. Notre système est soumis à une force excitatrice de type balourd. La vibration du rotor est contrôlée par des paliers. Pour les structures complexes Etudier l’effet de fissure de type transversale sur les rigidités équivalentes et le comportement dynamique d’une ligne d’arbre flexible fissurée supportée par deux paliers rigides en régime transitoire. Pour cela, un modèle mathématique simplifié de rotor appelé modèle de Jeffcott a été choisi. Tous dépendent la profondeur de la fissure du l’arbre sur la réponse vibratoire et la rigidité. Notre objectif est d’étudier l'effet de l’influence de la profondeur de fissure sur les rigidités équivalent. La présence de la fissure influe directement sur la rigidité du rotor, on constate que la rigidité diminue lorsque la taille de la fissure augmente, Les résultats obtenus constituent une contribution intéressante aux concepteurs des machines tournantes.