Abdelilah Braska , Abderrahman Laaouina, Aicha Assafi

كلية الآداب والعلوم الإنسانية-جامعة محمد الخامس بالرباط · المغرب

Rana Zeeshan Habib , Ruwaya Al Kendi

كلية العلوم-جامعة الإمارات العربية المتحدة · الامارات

Microplastics (plastic pieces size) are an emerging environmental contaminant that is ubiquitously present in terrestrial, aquatic and aerial environments. United Arab Emirates (UAE) is categorized among the highest domestic waste producing countries (on per capita basis) in the world. A large portion of waste ends up in the environment and contains macro-, meso- and microplastics. No comprehensive study has been carried out in the UAE to investigate the abundance, sources, distribution and impact of microplastics on its environment. Therefore, a comprehensive study to analyze the sources and distribution of microplastics in the UAE was urgently needed. The objective of the current research work was to explore the classical sources of microplastics (cosmetics, tire, road wear) and to find out potentially new or non-classical sources of microplastics found in UAE environment. The three-year (2018-2020) trends of microplastics usage in cosmetic products in the United Arab Emirates markets was explored. The micro-tire concentration in hot arid environment and abrasion pattern of old tires was investigated. As new or non-classical sources of microplastics were found plastic abraded from plastic cutting boards, wear material from road speed bumps, and loosened particles from artificial turfs. The microplastic origin from these sources and their presence in different environmental matrices was investigated. In case of plastic cutting boards, microplastic contamination load in food cut on these cutting boards was quantified. The physical changes in microplastics structure during cooking process was also investigated for microplastics abraded from plastic cutting boards into food. Additionally, the distribution of microplastic in soil, in the sediments of wadis, in road dust, and in run-off water was studied in Al Ain City and environs to have a better understanding of the dispersal of microplastics in a typical hot arid region with an absence of a riverine system connecting to the sea. The sludge of a wastewater plant in the Abu Dhabi Emirate was analyzed for microplastic to have a better knowledge of the pathways the microplastic takes in artificial distribution and collection systems. Lastly, the transfer of artificial plastic microbeads from a lower trophic level towards a higher trophic level was investigated by feeding Moina ( Moina parapura ) to red tilapia ( Oreochromis aureus x Oreochromis mossambicus ).

Namane Rachid, Tellache Mohamed Mounir

معهد الهندسة الكهربائية والإلكترونية-جامعة أمحمد بوقرة - بومرداس · الجزائر

R Benelkhyat, السيد عبدالغني عباس

كلية الطب والصيدلة - مراكش-جامعة القاضي عياض · المغرب

الهادى أدم محمد, عثمان موسى محمد نوح

كلية التجارة-جامعة النيلين · السودان

استهدفت الدراسة بناء اطارعلمى لقياس تكاليفصناعة النسيج فى السودان وفق نظام التكاليف على حيث تمثلت مشكلة البحث فى ان صناعة الغزل والنسيج تعتريها كثير من ((C B A اساس النشاط المعوقات التى حالت دون نمو واستمرارية هذه الصناعة الهامة، وردت معظم معوقات هذا القطاع الهام الى غياب نظم تكاليفية فى المصانع وفقدان الرقابة على الداء، وهذا ادى بدوره الى ارتفاع تكلفة النتاج بسبب التكلفة العالية وارتفاع اسعار مدخلت النتاج، وضعف التمويل اضافة الى قدم. الماكينات والمعدات والجهزة الى جانب عدم اتباع اسسعلمية فى دراسة الجدوى القتصادية: لتحقيق اهداف الدراسة تم اختبار الفروض التية لتمكن الطرق التقليدية لتحميل التكاليف فى تحديد تكلفة الوحدة المنتجة بصورة دقيقة فى صناعة -1.الغزل والنسيج يؤدى استخدام النظم الحديثة لتحميل التكاليف الى تحديد تكلفة الوحدة المنتجة بصورة دقيقة -2. لصناعة الغزل والنسيجبمصنع الدويم (C B A (تتوافر المقومات الساسية لتطبيق نظام التكاليف على اساس النشاط -3.للنسيج لقد اعتمد الباحث فى جمع البيانات الثانوية على الكتب ،الرسائل العلمية ،الدوريات ومواقع الشبكة : العنكبوتية كما اعتمد على المنهج الوصفى لدراسة الحالة للتعرف على القواعد والسس التى يمكن : العتماد عليها لقياس تكاليف الغزل والنسيج والمنهج التاريخى للتعرف على انماط المحاولت. السابقة لمعالجة مشكلة قياس تكاليفصناعة النسيج لقد توصل الباحث الى نتائج تؤكد صحة الفروض ، كما ختمت الرسالة بتوصيات مرتبطة بالنتائج التىتحصل عليها الباحث

AbdELbasit Elawad Mohammed Ahmed, Arafa Elgorashi Musa Abdalla, Awatif Alshreaf Gomndan Adam

كلية العلوم الصحية والبيئية-جامعة الجزيرة · السودان

The burden of diabetes mellitus continues to rise and constitutes a real threat especially in the developing world. As for most non-communicable diseases, change of behavior and adoption of healthy lifestyle habits help to prevent and slow down the increase of diabetes mellitus. The study was aimed to assess the knowledge, attitudes, and practices, among mothers towards diabetes in Elsahafa administrative unit, Khartoum state, Sudan, 2015. A descriptive Cross- Sectional community based study was carried out during the period from January, 2015 to May, 2016;a questionnaire was conducted and distributed to 380 mothers selected by simple random Sampling in Alsahafa Administrative unit.The data were analyzed by using Statistical Package Social Sciences (SPSS).the study indicated that98.9% of the mothers knew diabetes; 14.1% of the mothers said that diabetes is caused by lack of insulin, 86.4% knew diabetes symptoms; 46.8% stated that they knew all factors causing diabetes, 77.1% knew that both diet and physical exercise are methods for prevention from diabetes. 67.6% had a positive attitude towards diabetes, 68.2% had a positive attitudes towards diet, 52.4% had positive attitudes towards taking sugar, 73.9% had a positive attitudes towards sweets, 73.2% had a positive attitudes towards insulin, 71.6% a had healthy practices towards diet system, 50.5% stated that they practiced physical exercise, and 23.4%wearied diabetic shoes.The study recommended that Health Education must be designed and then directed to the mothers regarding diabetes knowledge, attitudes and practices, change mother attitudes regarding wearing diabetic shoes, promote and sustains group education as well as individualized education programmes for better preventive and management techniques in diabetes,increase the use of media to spread the message which could change the attitude of our public in the future, patient education is important in term of self-monitoring and comprehensive educational programme of diabetes, anda programmes for mothers in diabetes should be promoted by Commitment diet system, get rid of excess weight workout, and avoidance of emotional stress, anxiety and tension, and measuring blood sugar regularly to living with diabetes.

Ben Amara Abdallah, خليل خالد

كلية العلوم والتكنولوجيا-جامعة محمد الشريف مساعدية - سوق أهراس · الجزائر

Ce travail est consacré à l’étude de la résistance au flambement des tubes en composites.Cette étude vise la mise en évidence des paramètres qui influencent cette résistance en vud’une optimisation des performances du tube. Cette étude tient compte des effets structurelstels que la nature et le taux de fibre, ainsi que la stratification et des différentes orientationsdes plis sur la résistance au flambement. De plus, les facteurs géométriques combinés à l’effetde l’orientation des fibres ont été pris en considération dans le même cadre. Dans cetteoptique, nous avons effectué une analyse du flambement basée sur la simulation ducomportement des tubes en composites à base de verre/époxy et carbone/époxy. Pour mettreen relief les différents effets, nous avons varié les différents paramètres tels que le taux defibre, l’orientation des plis et la stratification. Ceci a permis de mettre en évidence la variationde la résistance au flambement en fonction de ces paramètres.Mots Clés : Composite, fibre de verre, tube, flambement, torsion

حمزة جيلالي تومي, سفيان مناعي , كريم حسني

كلية العلوم الاقتصادية والتجارية وعلوم التسيير-جامعة الجيلالي بونعامة - خميس مليانة · الجزائر

Cette etude a pour objectif connaitre l'importance du commissaire aux comptes, ses missions, ses remonsabilites et son role dam revaluation du systeme de controle inteme de l'entreprise en considerant cette etude du systeme de controle interne de lentreprise comme la plus importante des etapes du travail de commissaire auxcomptes et ca pause que le processus de la preservation des ressources de l'entreprise et connaitre la competence d'utiliser ces ressources et qui dependent de la stabilite de l'entreprise et son developpement, sont les obligations du commissaires aux comptes. En effet, cette etude descriptive et analytique aborde la definition du contrOle, son importance missions et remonsabilites du commissaire aux comptes puis le contrOle interne et ses types, aussi tme presentation analytique de la relation entre le commissaire aux comptes et revaluation du systeme de contrite intense et enfm tme etude sur terrain au bureau du commissaire aux comptes en abordant les differentes mesures qui les suit dam revaluation. L'etude a condo que le commissaire aux comptes a un grand et important role dans revaluation de la performance et la qualite du systeme de controle inteme en rendant l'enfreprise plus competant et credible. Ainsi, it aide a ameliorer la qualite de ses listes fiancieres.

Ali. A Mehna, Mehna, Ali. A

جامعة الزاوية (السابع من ابريل سابقا) · ليبيا

High-speed electric machines (HSEMs) have been widely used in many of today’s applications. The mechanical design of a high-speed electrical machine is a very responsible task because this type of machine is often designed to operate with a speed that is close to theflexural critical speeds. Errors in the prediction of these speeds can lead to unpleasant phenomena such as excessive acoustic noise emissions and catastrophic failures during operation. For high-speed machines, in particular, it is very important to accurately predict natural frequencies of the rotor at the design stage so as to minimize the likelihood of failure.The problem of reliable mechanical design of a high-speed rotor is more serious for a highspeed permanent-magnet (PM) machine because it has a more complex construction than a high-speed induction machine. The high-speed PM machines have some advantages over the high-speed induction machines like better utilization factors, higher power factors and higherefficiencies.The main goal of this project is to contribute to the development of high-speed machines by examining the design issues and performance. For permanent-magnet synchronous motors driven by high-frequency drives, the rotor speed is normally above 30 000 rpm, and it may exceed 100 000 rpm. The choice in this project has been made for a 7-kw permanent magnetsynchronous machine at 200,000 rpm.3D finite element analysis (ANSYS WORKBENCH 15) was used to determine the natural frequencies and rotor patterns of a synchronous high-speed permanent magnetic motor, to assess the impact of leading design parameters, such as length, column diameter,span, bearings, material properties, and to compare the results of the finite element program with the results of analytical methods (i.e. critical speed).

Meriem Bourahla, Abderrezak Guessoum, Hadjer Bachenine

كلية التكنولوجيا-جامعة سعد دحلب - البليدة · الجزائر

Le filtre de Kalman étendu (EKF) et le filtre à particules (PF) sont deux outils largement utilisés pour résoudre les problèmes d'estimation Etat non-linéaires. L'EKF est une approche sous-optimale, qui met en œuvre un filtre de Kalman pour un système dynamique qui résulte de la linéarisation de la dynamique de filtre non-linéaire original autour des estimations de l'état précédent. Mais elle a été définie sur l'hypothèse que les deux, le processus et le capteur bruits, sont de distribution gaussienne. Le filtre à particules est un schéma plus général et ne nécessite pas que les bruits soient gaussiens, Carles probabilités a posteriori sont représentés par un jeu d'échantillons pondérés sélectionnés de manière aléatoire. Ce travail a pour but de comparer l'utilisation du filtre à particules et l’EKF pour un problème d’estimation d’un signal de communication modulé en phase avec un bruit gaussien.