خديجة بوشندوقة, غزيبان علي

كلية العلوم الاقتصادية والتجارية وعلوم التسيير-جامعة اكلى محند أولحاج - البويرة · الجزائر

Halima Sifer, Bekka F., Samiya Laouar

كلية العلوم الطبيعية والحياتية-جامعة عبد الرحمان ميرة - بجاية · الجزائر

L’objectif de cette étude est d’évaluer l’activité antibactérienne des huiles essentielles issues de troisplantes aromatiques locales (Artemisia herba alba Asso., Lavendula stoechas L. et Mentha pulegium L.) et leurassociations avec des antibiotiques de différentes familles sur des souches multirésistantes (Staphylococcusaureus résistant à la méticilline et Acinetobacter baumanii résistant à l’imipénème). L'aromatogramme en milieusolide (méthodes des disques) a été utilisé pour évaluer l'activité de ces huiles essentielles ainsi que lesassociations huiles essentielles /antibiotiques.Toutes les huiles essentielles testées ont montré des effets plus ou moins importants sur les deux souches,l’huile essentielle de Mentha pulegium L. s’avère la plus efficace avec une activité plus prononcée surA.baumanii. Trois types d’interactions sont observés lors de l’association HEs/ATBs (antagonistes, indifférenteset synergiques), les interactions synergiques concernent beaucoup plus le SARM.La détermination des Concentrations Minimales Inhibitrices à été effectuée par la méthode demicrodilution en milieu liquide, les résultats obtenus montrent que les huiles essentielles donnent des effets antibactériens à de faibles concentrations.

عبدالقادر مساعد, محمد جعباق

كلية العلوم القانونية والاقتصادية والاجتماعية - طنجة-جامعة عبدالمالك السعدي · المغرب

الفاتح محمد أحمد محمد, عبد الرحمن محمد أحمد كدوك

كلية التربية-جامعة إفريقيا العالمية · السودان

Al-Hinai, Khalid Mohammed Adi, Ghoiamieza Vakili

كلية الهندسة-جامعة السلطان قابوس · عمان

In the Sultanate of Oman; there are still large remaining oil reserves that require implementation of the technically more challenging (EOR) applications processes. One EOR method for light oil reservoirs that has proven success in different parts of the world is CO2 injection.CO2 injection could be very beneficial in reducing residual oil saturation levels, for its higher oil ultimate recovery and for its use in the Carbon Capture and Storage (CCS) that leads to desirable benefits on the environment.Determining CO2-oil Minimum Miscibility Pressure (MMP) is the key parameter for the design and operations of successful CO2 miscible flood project. It is worthwhile mentioning that the miscibility with the oil at injection pressure of MMP occurs at CO2 supercritical conditions, which is the optimuin condition to become an efficient solvent.This research study outlines the method of predicting CO2-oil MMP for different Omani light oil reservoirs. Pure CO2 (purity of 99.9%) gas was used for the CO2 oil Miscibility experiments and it was obtained locally from the Rusail industrial area. The method used in this research study involved two parts; part-1, consisted of the experimental work based on the Rising Bubble Apparatus (RBA) experiments to measure CO2-oil MMP for different Omani light oils reservoirs and part-2, of the research study contained the development of a mathematical model based on the resulting MMP values obtained from the experimental work in Part-1.The RBA system was developed and constructed successfully internally in the most cost effective way, at SQU PVT Research Laboratory, with limited resources that required large amount of efforts and engineering thinking.There is an advantage for the SQU RBA system compared to the existing industry RBA system, is that the thermodynamics behavior required for the CO2 miscibility in the oil is satisfied due to the fact that there is more mixing of the CO2 bubble in the oil contained in the larger diameter sapphire cell and thus less surface effects. In addition, the SQU RBA System is less expensive than the market one and the resulting cost saving is 148,400.000 Omani Rials. The built SQU RBA system is the first gas-oil miscibility apparatus in Oman and it provides accurate measurements of gas-oil MMP.A new design has been discovered during this research study. In spite of the larger diameter of our experimental set-up compared to the commercial RBA system the new set-up allows the visual observation of the CO2 bubbles rising in the dark crude oil in the sapphire cell. This was achieved at no additional costs or minimal costs.The SQU RBA CO2-oil MMP experiments were performed on 11 x Omani oil samples obtained from real oil reservoirs from oil companies in Oman. Successfully achieved CO2-oil MMP experimental measurements for 10 x Omani oil samples and the resultshad a range of 5512.50 kPa to 14550.01 kPa. The remaining oil sample due it's to poor quality was not possible for the CO2-oil MMP experimental measurement.Equation of State (EOS) Phase behavior simulator software PVTPro5.2.1 was used in this research study for the planning and designing of the CO2-oil MMP experiments. PVTPro5.2.1 gave accurate prediction of CO2-oil MMP of up to 2.27% difference, for the oil samples compared to the experimental CO2-oil MMP values, except for one oil sample, the % difference was 28.36. The higher % difference of 28.36 was believed due to the oil sample had its bubble point pressure substantially lower than the initial reservoir pressure compared to the other remaining oil samples.The mathematical models to predict the CO2-oil MMP were developed for the Omani light oil reservoirs in this research study. Artificial intelligence (AI) techniques were used for the development of the new mathematical models. These models were derived from the Particle Swarm Optimisation (PSO) and Artificial Neural Network (ANN) mathematical methods. Accurate predictions of CO2-oil MMP were achieved by using the newly developed PSO and ANN models with % deviation of 5.73 and 2.76 respectively. Therefore, the newly developed PSO and ANN models, in this research study, resulted in more accurate predictions of CO2-oil MMP for the Omani oil samples than the literature models predictions. It should be noted that the newly developed PSO and ANN models were constructed based on the approach that the literature CO2-oil MMP data were used for the training process of the models and the RBA experimental CO2-oil MMP results for the Omani oil samples collected from real oil reservoirs in the Part-1 of the research study were utilised for the testing of models for accurate prediction of the CO2-oil MMP. This gives an advantage to the newly developed PSO and ANN models that they are general models and they are capable of being applied for Oman light oil reservoirs and more widely.The newly developed CO2-oil MMP PSO and ANN mathematical models for the prediction of the CO2-oil MMP, provide a fast and less time consuming method for the screening of potential Omani light oil reservoirs for CO2 flooding as an efficient EOR Method.

Chems Eddine Chitour, Kamel Benmaza, Toudert Ahmed Zaid

المدرسة الوطنية المتعددة التقنيات - الجزائر · الجزائر

Le présent travail porte sur l’étude de la formulation et des propriétés physicochimiques de détergents liquide vaisselle. Dans une première partie, la composition générale des détergents liquides est présentée en mettant en relief le rôle de chaque ingrédient dans la formule. Dans une deuxième partie, l’apport des polymères dans le domaine des détergents est passé en revue en mettant en valeur l’influence de ces polymères sur les propriétés macroscopiques des mélanges formulés. Une troisième partie présente l’essentiel des connaissances dans le domaine des interactions polymère-tensioactif en mettant l’accent sur les applications dans le domaines des détergents liquides. Dans la partie expérimentale, nous avons étudié l’effet d’un polymère anionique de la famille des carbomères (polyacrylate de sodium) dans une formule de détergent liquide vaisselle à base des tensioactifs anioniques. Les résultats ont montré que bien que améliorant sensiblement la viscosité du produit, le polymère a un effet négatif sur diverses propriétés mesurant la performance du liquide vaisselle.

Muna Mohammed Falouqa, علي إبراهيم

كلية التربية -جامعة الإمارات العربية المتحدة-جامعة الإمارات العربية المتحدة · الامارات

This study aimed to investigate the extent of the collaborative school culture in Al Ain Cycle Three schools. The study was guided by three research questions and used the descriptive mixed research method. Data for this study were collected through a questionnaire divided into three section. The first section included demographic information of participants. The second part included 29 items about the Collaborative School Culture (CSC), which measures the extent of six components of CSC. These components were collaborative leadership, teacher collaboration, professional development, unity of purpose, collegial support, and learning partnership. The third part was an open-ended question eliciting teachers’ suggestions for improving the collaborative culture in their schools. The questionnaire was sent to 11 secondary schools. Then, the Mann-Whitney Test was used to find out whether collaborative school culture differs according to the gender of teachers. The results of the study showed that collaborative school culture components are available in Al Ain secondary schools to a good extent. Regarding gender, the study found that male and female teachers in the sample had significant differences in their views about the six components of collaborative school culture. Male participants reported higher availability for all the components of collaborative school culture. Finally, teachers perceived that there were certain shortages in their schools regarding collaborative school culture that can be improved through initiatives by the principals, school administration, teachers and parents.

Bouselsal Boualem, Fennich Abdallah

كلية المحروقات والطاقات المتجددة وعلوم الارض والكون-جامعة قاصدى مرباح ورقلة · الجزائر

. La vallée du M’zab, située dans le sud algérien, est soumise à un climat saharien aride. L’accroissement démographique et le développement agro-industriel ont engendré une très forte demande en eau, nécessitant une grande mobilisation de ces ressources en eau exploitables. Objectif de ce travail c’est d’évaluer la qualité physicochimique des eaux de différentes aquifères vis à vis aux normes de l’OMS et aux normes algériennes de potabilité, et de leur aptitude à l’irrigation. Dans la région du M’Zab il existe deux aquifère ; L’aquifère superficielle est formé d’alluvions et de sables du Quaternaire d’épaisseur peut atteindre 25 à 30 mètres reposent sur les couches calcaires du Turonien fissurés d’épaisseur de 40 à 100m, et un aquifère continental intercalaire dans la vallée du M’zab est composé de sables fins et de grés jaunâtres à gris à intercalations d’argiles, leur toit atteint la cote de 290 à 300 mètres. Les eaux dela nappesuperficielle de la vallée de M’zab, sont non potable en référent aux normes de l’OMS et aux normes algériennes d’eau potable, car elles sont très minéralisées et très dure. Leurs faciès estchloruré magnésien, chloruré calcique, sulfaté calcique, sulfaté sodique et sulfaté magnésien. La représentation de ces eauxsur le diagramme de Richards montre qu’elles sont de mauvaise à très mauvaise pour l’irrigation car elles se trouvent dans les classes C4-S1 et C4-S3. Les eaux de continental intercalaire sont de faciès sulfaté calcique ou chloruré sodique en générale, elles sont potable en référent aux normes de l’OMS et aux normes algériennes. La représentation de ces eauxsur le diagramme de Richards montre qu’elles sont de qualité moyenne à médiocre pour l’irrigation car elles se trouvent dans les classes C3 S1 et C3S2.

Hamid Slimani, Hind Hammouch

كلية العلوم القانونية والاقتصادية والاجتماعية -جامعة سيدي محمد بن عبدالله - فاس-جامعة سيدي محمد بن عبدالله - فاس · المغرب

صادق عبد الحسين كريم, محمد جابر جاسم

كلية العلوم للبنات-جامعة بابل · العراق