Bourezeg K, Latreche Maamar

كليات العلوم والتكنولوجيا-جامعة 8 ماي 1945 قالمة · الجزائر

Abdelkader Benyattou, فريد بن شريف

كلية الرياضيات-جامعة العلوم والتكنولوجيا هواري بومدين - الجزائر · الجزائر

Ce mémoire est consacré à l'étude de certaines propriétés arithmétiques des nombres de Bell et plus particulièrement à l'étude détaillée d'un article Zhi-wei Sun et Don Zagier intitulé "!On a curious property of Bell numbers" paru en 2011. Il s'agit de prouver une congruence portant sur les nombres de Bell. Cette congruence fut tout d'abord conjecturé par Zhi-wei Sun puis finalement prouvée par Zhi-wei Sun et Don Zagier. Dans leur article, ces deux auteurs prouvent aussi une extension de cette congruence aux polynômes de Touchard .

انعام عباس سلمان علوان السعدي, حامد ابراهيم عبود محمد

كلية العلوم-جامعة بابل · العراق

Present thesis deals with the electronic structure of some suggested compounds based on anthracene molecule for photovoltaic applications as dyes sensitized solar cells. The studied compounds were initially designed at the Gauss View 5.0.8 program and then relaxed by performing the B3LYP-DFT hybrid functional together with the 6-31G basis sets at Gaussian 09 package of programs to study and analyze of ground state and spectroscopic properties of the compounds.The TD-DFT method was performed to study of the excited states properties of the studied compounds. The results showed good relaxwas obtained for the compounds from the used DFT theoretical method. The calculated values of geometrical parameters and virial ratio of the compounds are in a good agreement with experimental data and other theoretical studies.The total energy is independent on the position of the same subgroup in the compounds, it depends only on the number of electrons in each compound.From the calculations, the results showed the studied compounds show delocalizationof LUMO and localizationof HOMO, they both changed significantly to suggest different structures play important roles in electronic properties. The effect of symmetry and distribution of aromatic rings has an influence on the calculation of HOMO and LUMO.The results of the energy gap showed the inserting the double and triple carbon-carbon bonds between the backbone anthracene molecule and the phenyl rings in both donor and acceptor sides, and the presence of an electron attracting NO2subgroups in the compounds reducing the band gap of the compound. Thus, increasing the conjugation length of the compounds make the compounds to take place in the charge transfer processing.TheSummary IIcompounds 9 and 11 have the lowest values of energy gap, 2.13 eV and 2.182 eV, respectively. On the other hand, the LUMO energy levels of the compounds as dyesare higher than that of TiO2and PCBMconduction, both HOMO and LUMO levels of the studied compoundsagree well with the requirement for an efficient photosensitizer, the electron injection from the compoundsto the conduction band of TiO2and PCBM,and the subsequent regeneration are possible in organic sensitized solar cell.From the calculations, one can showed some compounds have high electronegativity, electrophilic index and molecular polarizability,they have high ability to interact with other species in the space.And, the density of statesin the conduction band ismore than thatin the valence band,this property makesfrom these compounds to behave anappropriate electronic applications when interacts with other molecules or species. The spectroscopic properties of the studied compounds observed the vibrational frequencies of C-C and C-H bonds are agree with those in phenyl compounds from experimental data.The open circuit voltage of the compounds with TiO2lies in the range (0.4733-1.9139)V, and with PCBM lies in the range (0.0359-1.1420)V, the higher value of open circuit voltage is 1.9139V compound 3 in presence of TiO2. In general, most of the studied compounds have direct electronic transition from the valence to conduction band with wave length lies in the range of solar spectrum. The compounds in this thesis have an application as photovoltaic materials

بقاسم دفة, بوبكر نصبة

كلية الاداب والعلوم الانسانية و الاجتماعية-جامعة محمد خيضر - بسكرة · الجزائر

عبد القادر فلفول, أحمد باشي

كلية العلوم الاقتصدية وعلوم التسيير‎-جامعة سعد دحلب - البليدة-جامعة سعد دحلب - البليدة · الجزائر

فرج نعوم, مناف فارس, وحيد راغب ابراهيم

كلية الهندسة الزراعية-جامعة حلب · سوريا

AbdulRahman Sakhr Ali Almessabi, Mohammad Eid Al Suwaidi , Youcef Bouzidi

جامعة خليفة · الامارات

Zakum field is planned to be extended and developed to the Western area, which is sparsely drilled and has variable reservoir quality. The reservoir target is Thamama 2 (Th 2) that was deposited during early Barremian Early Cretaceous and is divided into six zones that are separated by styolites. The reservoir rocks were deposited in a broad low angle shelf with coarsening upwards sequences of mud-dominated to grain-dominated limestone with reservoir quality degrading westward where the main diagenesis process is calcite cementation, which is retarded due to late hydrocarbon charge. Existing static and dynamic models have sparse, static, and dynamic data points in the West in comparison to closely spaced data points at the crest of the structure. Western area has shown relatively better performance with recent wells in comparison to simulation prediction models. Seismic data with large lateral inter-well resolution was integrated through stochastic inversion leading to higher resolution in the wells to generate several realizations of higher resolution acoustic impedance that show an improved reservoir property distribution in the western part of the field. This is achieved by averaging 25 realizations by incorporating Relative Acoustic Impedance seismic variograms, Depth migration velocity field and data from 249 wells across the field. Three approaches were tested to populate porosity including 1) Regression of porosity against Acoustic Impedance (AI) for all wells, 2) trend and using Sequential Gaussian Simulations (SGS) based on seismic variograms, and 3) co-krigging to average AI with porosity. A trend guided porosity prediction has provided the most reasonable results. Therefore, all available wells (507 in total) were used to populate porosity for each zone and layer respectively. Initially, some mismatches were observed linked to probably changes in zone quality at inter-well scale and saturation rise in transition zone led to relatively higher acoustic impedance in comparison to the relatively high porosity. This issue was mitigated through integrating all available wells. Other reasons might be due to the overburden thickening towards the west exceeding 1000 feet where rocks are much stiffer. The results from this study will help achieving the ultimate goal to optimize the development of the western part of the oil field. The results have shown a superiority to the prior existing model and have better highlighted the reservoir quality variation across the field.

المختار الهراس, فيصل عبدالله سعيد النقبي

كلية الآداب والعلوم الإنسانية-جامعة محمد الخامس بالرباط · المغرب

يسعى الباحث من خلال هذه الدراسة، إلى البحث في قضايا الرفاه بدولة الامارات العربية المتحدة، وذلك من خلال السياسات الاجتماعية، التي تنهجها الدول، مع إبراز أهمية الاقتصاد الإماراتي في تحقيق ذلك، كما يهدف الباحث إلى لإبراز رؤية الدولة في الرفاهية الاجتاعية والاقتصادية، والتي تستند على رؤية خاصة تنهجها قيادة البلاد. ولأجل ذلك، فقد أجرى الباحث مسحا للعديد من التقارير والدراسات المرتبطة بالسياسات الاجتماعية والرفاه، سواء تعلق الأمر بالبلدان العربية أو الغربية، وذلك بهدف عقد مقارانات، حتى يتسنى للباحث فهم مسارات الرفاه الاجتماعي بدولة الامارات العربية المتحدة ومن أجل إكتمال فهم مجريات السياسات الاجتماعية والرفاه بدولة الامارات العربيةالمتحدة ، أنجز الباحث دراسة ميدانية، ليتمكن من قياس مستوى الرفاه بالدولة ومواقف المواطنين والمقيمين من الرفاه ومستوى الرفاه.

Houda Bendani , Mouna Ouadghiri, Salma Chahed

كلية الطب والصيدلة-جامعة محمد الخامس بالرباط · المغرب

عبدالقادر خليفي, نجيبة برباش

كلية العلوم الانسانية والاجتماعية-جامعة محمد بوضياف - المسيلة · الجزائر