Ahcen Bouchemma, Chahra Zed Hazem, Rahma Djedid

كلية العلوم الدقيقة وعلوم الطبيعة والحياة-جامعة العربي بن مهيدي - أم البواقي · الجزائر

Nous présentons dans ce travail de recherche une étude d'adsorption d'un collecteurcationique à base d'amine sur la surface de Quartz. Le suivi de l'étude de l'adsorption a étéréalisé par la spectroscopie infrarouge.Cette étude est consacrée aussi à la préparation d'un sel d'amine à partir d'une réactionacido-basique entre une amine primaire et un acide fort dans un milieulégèrement dilué. Le sel d'amine préparé a été caractérisé par IR. (We present in this research work a adsorption study of a collector amine cationic composition on the Quartz surface. Follow-up of the adsorption study was performed by infrared spectroscopy. This study is also devoted to the preparation of an amine salt from a reaction acid-base between a primary amine and a strong acid in a medium slightly diluted. The amine salt prepared was characterized by IR.)

Abrar Abdulla, Tamirace Fakhoury

مدرسة الآداب والعلوم-الجامعة اللبنانية الأميركية · لبنان

The global capitalist distribution of resources and power allowed racialized and gendered institutions to operate and govern based on the concept of the division of labor. Predicated on this, domestic work became a devalued feminized reproductive form of labor, mostly performed by migrant women and underprivileged individuals for relatively affluent households. The gendered and racialized institutions has made women migrant domestic workers prone to experiencing exploitation because their labor is marginalized as unproductive real job, hidden behind closed doors. Domestic labor became publicly irrelevant labor especially as it is performed in the private sphere. Accordingly, this research will apply the intersectional feminist institutionalism approach to understand how the intersection of gender with different social identities determines the way institutions function, either to include or marginalize women migrant domestic workers. To further emulate this, the research will use the case of women expatriate domestic workers in Bahrain. This research will attempt to answer how have Bahrain's formal and informal institutions interacted to facilitate or impede the inclusion of women migrant domestic workers in the public space. In yet another perspective, it will highlight some of the bottom-up responses that women migrant domestic workers deploy to resist marginalization in Bahrain and will provide an insight into how civil society organizations challenge practices of institutional marginalization.

Abdelkader Gasmi, Amara Abdelkader

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

Dans cette thèse on s’intéresse à la résolution analytique et numérique d’un problème d’un jet bidimensionnel devant un mur de forme quelconque, le fluide est considéré comme incompressible, non visqueux et les effets de la gravité sont négligés. Ce problème est caractérisé par la condition non linéaire donnée par l’équation de Bernoulli sur la frontière libre et de la forme inconnue de ce jet. Dans le cas où l’effet de la tension de surface est négligé, la solution exacte est obtenue en utilisant la théorie des lignes de courant libre. Mais si on considère la tension superficielle le problème devient très difficile à résoudre analytiquement, on utilise la technique de troncation de la série et la méthode intégro-différentielle pour le résoudre. Ces deux méthodes sont basées sur les transformations conformes, et elles ont un avantage de transformer le problème bidimensionnel à un problème unidimensionnel. Une comparaison entre ces deux méthodes a été illustrée.

اديان حسن حمود التميمي, حيدر عبد الزهرة علوان الساعدي

كلية التربية الاساسية-جامعة ميسان · العراق

إيمان ظاهر عارف, جيا عمر عثمان, زيد خلف خض

كلية الطب البيطري-جامعة السليمانية · العراق

Due to its toxicity, persistence, bioaccumulation, and biomagnification characteristics, heavy metal pollution is a significant environmental issue. Fish take heavy metals through GIT or gills as they grow, and they are unable to expel these heavy metals. When people eat polluted fish, the heavy metals in it concentrate and become more enriched in the body, harming their health. The study aimed to perform a microbiological evaluation of fish muscle, an estimate of heavy metal accumulation, including nickel, copper, lead, cadmium, and cobalt, in fish muscles, and find the relation between heavy metal accumulation in fish and heavy metal resistance genes in E. coliresiding in the fish. A total of 180 fish samples (Cyprinus carpio) were taken from three distinct areas of Dukan Lake, sixty samples for each of the fishing areas (the center of Dukan Lake, Ranya, and Qaladze) in the winter and spring. The microbiological evaluation of fish muscle was determined by the total bacterial count and total coliform. The total bacterialcounts for fish samples from Dukan, Ranya, and Qaladaza were 9.6985×104, 1.5437×104, and 1.2403×104 respectively. On the other hand, the total coliforms for fish samples from Dukan, Ranya, and Qaladaza were 4.912×103, 1.005×103,and 0.722×103 respectively. The descending order of the mean values for the metals found in fish muscles was Cu > Pb > Cd > Ni > Co. Except for cadmium, whose result (0.136 mg/kg) was higher than the 0.05 mg/kg threshold set by the European Union and government, all of the identified heavy metals were within the authorized FAO levels .The location, sex, and season of the fish that were caught had an impact on the concentration of Co, whereas the sex of the fish had an impact on the concentrations of Cu and Ni, for the lead neitherlocation, sex and season have effects on it. The isolation and identification of E. coliwere performed using culturing and molecular methods. Of the 180 fish samples, 116 (64.4%) were positive for E. coli by culture. The molecular detection showed that 92 (51.1%) samples were positive for the 16S ribosomal RNA gene and 12 (6.7%) were positive for the copA gene, while boththe czcA and nccgenes were not detected in any samples. The E. coligene 16S rRNA has been sequenced and assigned accession number ON385541 under the name "E. coli isolate 2022 mabao" in NCBI GenBank. The phylogenetic analysis of 16S rRNA gene sequences revealed that E. colistrains were related to other E. colibacteria from other countries, with the maximum identity being 99.61 percent. In conclusion, for both microbiological evaluation and heavy metal concentrations in fish muscle, consuming such fish poses no dangers to humans except cadmium. For the heavy metal resistance genes, small numbers of E. coli isolated from common carp in three distinct areas of Dukan Lake have the copA gene. Additionally, the 16S rRNA gene sequence analysis in this study revealed that the conserved region of this gene only had a few minor nucleotide changes.

ريغي هشام, كوثر بودربالة, يوسف بركاتي

معهد العلوم الاقتصادية، التجارية وعلوم التسيير-المركز الجامعي عبد الحفيظ بو الصوف · الجزائر

عبد الباسط القني, نادية بوشلالق

كلية العلوم الانسانية والاجتماعية-جامعة قاصدى مرباح ورقلة · الجزائر

- يعد محيط المؤسسة التربوية, محيطا " مناسبا" للفرد المتعلم لإبراز قيمه,والتي من خلالهـايترجم أنواع سلوكه داخل البيئة التعليمية,فتدفعه تلك القيم إلى تحديد إتجاه مساره التعل ,يمي أيمدى دافعييته نحو التعلم . - فجاءت هذه الدراسة ,لتكشف العلاقة بين القيم التي يحملها المتعلمون, ودافعييـتهم نحـوالتعلم . - وشملت عينة الدراسة على101طالبا" وطالبة, من سنة الثالثة من التعليم الثـانوي بمدينـةتقرت بين الشعبة الأدبية والعلمية,حيت تكمن أهمية الدراسة , في ربط المكونـات المعرفيـةالوجدانية بما فيها القيم,وما يدرس ه المتعلم في المؤسسة التعليمية,وخلصت نتائج الدراسة فيمايلي :*عدم وجود علاقة إرتباطية ذات دلالة إحصائية بين قيم الطلبة, ودافعييتهم نحو التعلم .*وجود فروق ذات دلالة إحصائية في قيم الطلبة, بين الشعبة الأدبية والعلمية .*عدم وجود فروق ذات دلالة إحصائية, في دافعية التعل م بين الأدبيين والعلميين .*عدم وجود فروق ذات دلالة إحصائية في القيم ودافعية التعلم بين الذكور والإناث

Hind Abdel hamid Hussein Rustom, Kamal Mohammed Saeed

كلية الدراسات العليا-جامعة السودان للعلوم والتكنولوجيا · السودان

The leaves of Camellia sinensis were extracted with 95% ethanol at room temperature.Phytochemical screening (qualitative tests) of the alcoholic extract of the leaves of Camellia sinensis revealed the presence of flavonoids, alkaloids, steroids, tannins, and absence of glycosides.The main flavonoid of Camellia sinensis was investigated due to its medicinal value and relative abundance in this plant species.The main flavonoid was isolated and purified by thin – layer chromatography (TLC) on silica gel using the solvent system chloroform: methanol 3:2 (v:v) from the ethanolic extract , where one flavonoid was obtained in the pure state.The behavior of this isolate under the UV light and its colour reactions indicates that it is a dihydroflavonol.The flavonoid was subjected to spectral studies, and the following partial structure was proposed on the basis of its IR, UV-Vis spectra:

محمود الجعفري, هيثم محمد حسين جبرين

معهد الإدارة والاقتصاد-جامعة القدس · فلسطين

Abdelkader Boualem, Kawther Yourid

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

Over the last decade, the rainfall of climate change has been recognized as one of the major development problems at local, regional and even international levels, alongside sustainable development, conservation and Environmental protection. In order to elucidate this problem, it is essential to analyze the precipitation term. An attempt has been made to address some of the most troubling and fundamental questions, including: How do we assess the rainfall of our region in space? Is there a decrease in precipitation over the last decade? From this perspective, we studied rainfall using statistical treatment and analysis of drought indices. The calculation of the indices for the different stations reveals the existence of two distinct wet and dry periods. The years of drought are remarkable because they can settle for 4 years. There is a decrease in rainfall during this study period but is also interrupted by other years of high rainfall in some areas such as Chlef and Mostaganem. It is as if, the more one goes west the more the drought impact is present.