Abdallah Al-Shammari , أولاد يبو حبيب الله بوسن

كلية الهندسة-جامعة الملك فهد للبترول والمعادن · السعودية

The valorization of carbon dioxide, which is a major green-house gas, has been studied in this report. The higher global demand for energy has increased the amount of the carbon dioxide released into the atmosphere from 275 ppm before the industrial revolution to 375 ppm in the year 2000 and 400 ppm in the year 2015. The further increase in the emitted carbon dioxide gave rise to one degree rise in the average temperature of the earth between the year 1960 and 2010 and 0.3 degree rise from 2010 to 2015.Catalytic CO2 hydrosilylation is a thermodynamically favored chemical process that could be potentially applied to large-scale transformations of this greenhouse gas. There have been an increasing number of experimental studies during the last decade regarding metal-catalyzed CO2 hydrosilylation processes. Ruthenium and Iridium catalysts are the first examples of catalytic systems used for CO2 hydrosilylation. Presently, there are several examples of other catalysts, including transition metal species acting alone or together with B(C6F5)3 and organocatalysts which are able to perform this reaction.In the hydrosilylation reaction, a relatively cheap silicon compound, 1,1,1,3,5,5,5-heptamethyl trisiloxane (HMTS), was catalytically converted to silylformate, which can be hydrolyzed to a more important compound, i.e. formic acid. The study has focused basically on two type of the Iridium (III) complex type [Ir(H)(CF3SO3)(NSiN)(coe)] (Catalyst 1) and [Ir(H)(CF3OCO)(NSiN)(coe)] (Catalyst 2) (NSiN = bis(pyridine-2-yloxy)methylsilyl, coe = cyclooctene) for the selective formation of silylformate by solvent free hydrosilylation of CO2 with 1,1,1,3,5,5,5-heptamethyltrisiloxane (HMTS). The activity of this catalytic system depends on the reaction temperature and the CO2-pressure. This work includes a kinetic study at variable temperature (from 25 oC to 75 oC) and pressure (from 1 bar to 8 bar) together with a kinetic modelling of this catalytic reaction. The best catalytic performances have been achieved at 75 oC and 8 bar of CO2.The Arrhenius equation was used for the kinetic modelling and non-linear regression of the experimental data used in predicting the kinetic parameters i.e. rate constant and the activation energy. The average activation energies estimated for the catalyst 1 and 2 were 72.1 kJ/mol and 47.5 kJ/mol respectively, thereby giving an indication that catalyst 2 is more efficient than catalyst 1.

أسامة حسني , خالد نصار , شريف صفار, محمد أيمن أحمد شريف

كلية العلوم والهندسة-الجامعة الأمريكية بالقاهرة · مصر

Achieving the optimum design is to sustain the architectural function with minimum construction cost. Optimizing the design requires the architect to prepare several design alternatives with different space utilizations approaches without compromising the architectural requirements or the function of the building. For each design alternative, the structural engineer is required to study and validate the design with various alternatives of structural systems to achieve a safe, efficient, and constructible design. Due to the dynamic nature of this process, a building’s floor plan could have numerous combinations of alternatives that satisfy the architectural and functional requirements that need to be investigated to achieve the optimum cost. The literature has discussed various optimization approaches between the integration of architectural and the structural aspects during the design phases of projects. However, defining the possible integration between architectural and structural limits to reach an optimized design that fulfills the design functionality and is cost efficient was not much covered. This study presents a digital framework that integrates the architectural and structural design aspects to reach the optimum utilization between the functionality of the architectural design and savings in the structural design using BIM. A model was developed that maps elements onto a universal grid system where architects define the functionality limits such as, overall floor dimension, the number of spaces in the floor, the function of each space, the relative proximity of spaces and the acceptable dimension limits of such spaces. A built-in optimization engine using evolutionary algorithms to find the optimal structural design of the building that fulfills safety, constructability and with minimum use of building materials was also included in the model. The study covers three structural systems: the reinforced concrete solid slabs, flat slabs, and beams systems and is applied for rectilinear architectural spaces. The framework was tested and validated with a number of case studies. Results show that the model was able to produce cost savings from 5-15 % of the structural elements cost without compromising the defined space requirements.

أنوار علي هادي حمزة, هدى سعدون لفته

كلية القانون-جامعة القادسية · العراق

Hanane Boudiaf, Nabil Boukhannoufa

كلية التكنولوجيا-جامعة محمد بوضياف - المسيلة · الجزائر

L’électrocardiographie est une technique largement utilisée pour le diagnostic correct d’un certain nombre de maladies cardio-vasculaires, elle remplit bien sa fonction et fourni de façon fiable un signal auquel nous pouvons appliquer des méthodes appropriées du traitement de signal.Généralement les signaux électrocardiogrammes ECG sont contaminés par des bruits. Ces bruits peuvent être de natures internes ou externes et sont créés durant la phase d’enregistrement.L'objectif visé dans ce projet est le débruitage du signal ECG. Pour, cela et afin de minimiser le bruit qui contamine le signal ECG, nous avons utilisé quelques méthodes pour filtrer le signal ECG et tirer la méthode la plus adéquate. Cette étude vise à utiliser un seul capteur et plusieurs capteurs pour l’acquisition du signal afin d’augmenter les performances du filtre utilisé.

Sarah Merrouche, Abdelali Berriche

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

This dissertation is concerned with the use of films in language classes and its advantages in enhancing the EFL students' pop culture awareness. Additionally, an attempt was made to investigate the teachers' and students' perceptions about the role of culture in language teaching and learning. The quasi-experimental study explored the effects of watching films on the students' level of pop culture awareness. A pre-test, post-test group research design was used. The sample was constituted of two classes of first year LMD students at the university of Larbi Ben M'Hidi. A total of 28 students were involved in this study.The experimental group was exposed to the target language pop culture for a total of eight sessions. The sessions spanned over 2 month; with the control group, a script's reading was used. Data are collected from two cultural quizzes and the statistical tool of the Independent Samples test was used to determine whether there were significant intergroup differences, and a paired t test also was used. Another qualitative design was followed, a questionnaire for teachers and another for students. The results of the study show that the experimental group outperformed the control group (11.0769>8.80). Films are recommended to be used, within language lessons. The results from the questionnaires show that, on the one hand, teachers (87.50%) believe in the relationship between language and culture. On the other hand, students (100%) believe that culture learning is beneficial. Finally, suggestions for future research and limitations of the study are presented.

حكمت عيسى, محمد حمزة ابراهيم

كلية الاداب والعلوم الانسانية-جامعة تشرين · سوريا

رحوي عباسية بلحسين, أحمد العلاوي

كلية العلوم الاجتماعية-جامعة وهران 1 - أحمد بن بلة السانية · الجزائر

تندرج هذه الدراسة العلمية في إطار التحليل السوسيولوجي الوصفي، الذي نحاول أن نقرأ ضمنه واقعنا التربوي من خطابات وتوجهات فكرية ونصوص رسمية، سواء تعلق الأمر بالمستوى النظري أو التطبيقي، و من ثم قسمت هذه الدراسة إلى أربعة فصول تربط بين الجانب النظري و الجانب الميداني، وُطّءَ لهم بمقدمة و إشكالية و فرضيات و الإجراءات المنهجية.أما الفصل التمهيدي يتضمن الإطار النظري للإشكالية و الفرضيات و تحديد المفاهيم الإجرائية بالإضافة للإجراءات المنهجية للبحث الميداني. الفصل الأول الذي تناول موضوع النظام التعليمي الجزائري، حيث حاولنا فيه تسليط الضوء على الصيرورة التاريخية لهذا النظام منذ 1832 إلى 1962، الفصل الثاني الذي يندرج تحت عنوان" التعليم الابتدائي بالجزائر"، حيث شمل على لمحة تاريخية لهذا النوع من التعليم، ثم تعريف المدرسة الابتدائية ومسار الإصلاحات الجديدة 2003/2004 أما الفصل الرابع جاء حول "المنهاج الدراسي" كعنصر أساسي من النظام التعليمي بصفة عامة و أهميتها في التعليم الابتدائي بصفة خاصة و الفصل الرابع" حيث تناولنا فيه الإطار النظري لمفهوم التكوين وصيرورة التكوين بالجزائر و معاهد التكوين من معاهد التكنولوجية التربية و الجامعة و المدارس العليا للأساتذة و كل أنواع التكوين الذي طبقته مديرية التكوين،و هذا كله مدعم باستفسارات المبحوثين و ختمنا الفصل بإعطاء قراءة تحليلية للخطاب الرسمي للتكوين بالجزائر

Souad Aghroud , Meriem Amokrane, Said Kaci

كلية العلوم الاقتصادية والتجارية والإدارة-جامعة عبد الرحمان ميرة - بجاية · الجزائر

Le pétrole constitue la quasi-totalité des produits exportés au monde Cependant, le marché pétrolier est caractérisé par une volatilité et instabilité continue des prix et surtout dans la période du covid-19. Dans ce travail nous avons évalué l'effet de la pandémie de covid-19 sur la volatilité des prix de pétrole. En effet, nous avons analysé l'effet négatif de la pandémie sur les prévisions des prix de pétrole et les écarts de prévisions qui à effectués par une estimation TARCH, entre la période avant covid-19 et après l'intégration de la période covid-19. Cette dernière a induit une baisse des prix du pétrole prévisionnelle de 30%.La comparaison entre les prix produits par cette prévision et les prix réels de 2022 montre un écart de 19%. Dans ce sens, la pandémie constitue un choc exogène négatif que les modèles prévisionnelles qui sont adapté à la mesure de volatilité, telles que le modèle ARCH, n'ont pas pu le capté.

Hamid Mekhmoukhen, Yacine Illoul, Mohand Akli Oughlissi

كلية العلوم الاقتصادية والتجارية والإدارة-جامعة عبد الرحمان ميرة - بجاية · الجزائر

Ce travail de recherche, nous a permet de constate le rôle emportant que joue le tableau de bord de gestion au sein d'une entreprise et sa contribution vers la réalisation, de ses objectifs.Pour l'élaboration de tableau de bord de gestion il faut suivre un ensemble d'étapes : collecte de donnée, transformation de donnée en grandeur statistique et financière, caractérisation une gestion de l'entreprise, transformation en grandeur en schéma, présentation ces grandeur dans cadran d'une manière précise et claire permettant leur lecteur à fin de prendre des décisions

M.C.A Djibaoui Rachid, Abed Arabi

كلية علوم الطبيعة والحياة-جامعة عبد الحميد بن باديس مستغانم · الجزائر

Helicobacter pylori live in the human stomach. It is considered among the rare known micro-organisms being able to survive in such an acid environment. Currently the number growing of therapeutic failures is due to the resistance of this bacterium to usual antibiotics.Initially our work consisted in putting in culture and identifying this pathogenic bacterium by realization of a culture in microaérophilie on growth Columbia with the blood of horse followed by the biochemical tests.The resistance of Helicobacter pylori to antibiotics us to thorough to exploited the antibactériens effects of the essential oils of a medicinal plant of Algeria, Pistacia lentiscus L, extracted by hydrodistillation with an output from 0, 23%.Lastly, we carried out an aromatogramme with various concentrations (50%, 25%, 12.5%, 6.25%, 3.12%, 1.56%, 0.78% and 0.39%) of the essential oils extracted on Helicobacter pylori and a stock from infantile gastro-enteric E.coli.The results obtained showed that the stock tested of Helicobacter pylori was strongly sensitive to essential oils of Pistacia lentiscus L compared to E.coli.Essential oils of Pistacia lentiscus L can be used like a natural treatment with respect to Helicobacter pylori.