Osman Abdullatif, معاذ عبد التواب محمد علي صالح

كلية العلوم-جامعة الملك فهد للبترول والمعادن · السعودية

The Miocene Dam Formation in the Al-Lidam area of eastern Saudi Arabia consists of a succession of mixed siliciclastic-carbonate sequences that were deposited during Miocene (Burdigalian) times. Stratigraphic equivalents of the Miocene Dam Formation occur as hydrocarbon reservoir intervals in the Arabian Plate in Iraq and Iran.Previous studies have demonstrated that reservoir quality in carbonate rocks is mainly controlled by depositional setting and post-depositional diagenesis. Carbonate minerals are more susceptible to diagenesis than are their siliciclastic counterparts. This diagenetic susceptibility is mainly due to the high chemical reactivity of carbonate minerals. Diagenetic processes can be either porosity enhancing and/or porosity destructive.In this study, based on description of the lithology, sedimentary structures, texture, fossil content, and diagenetic features, fifteen lithofacies were identified within the Miocene Dam Formation in the study area. These lithofacies were deposited on, a low angle dipping, carbonate ramp under supratidal, beach, intertidal and shallow subtidal conditions. Carbonate diagenesis has been examined using different analysis tools, including: thin-section petrography, SEM, XRD, XRF and cathodoluminescence. These analyses tools have shown that the studied succession, especially the intertidal grainstones and packstones, are influenced by extensive meteoric diagenesis that led to formation of moldic and vuggy porosity. In addition to these dissolution related porosities, meteoric diagenesis is also observed in the form of meniscus, microstalictitic and equant calcite cement. Marine diagenesis was also observed, but it was restricted to the beach grainstone and subtidal quartz wacke-packstone lithofacies, in the form of aragonite and high magnesium calcite cement on the grain margins. Shallow burial conditions were inferred by grain contacts represented by point, suture and concavo-convex contacts. In some intervals, such as in the mud-dominated wackestones, hairline-thick fractures were observed. Mimetic dolomitization for the whole succession was also observed. The association of dolomite with evaporites minerals led to the interpretation that dolomitizationas sabkha-evaporative dolomitization model.Sequence stratigraphic approach was used in order to link the diagenetic processes to depositional setting and relative sea level fluctuations. Three fourth-order, shallowing-upward sequences were identified in the study area, and they are separated by two sequence boundaries. A clear relation between sequence surfaces and diagenetic processes was observed; the meteoric related diagenetic processes and dolomitization increase upwards (towards the sequence boundary) in each sequence. Porosity and permeability measurements have shown that the highest values are associated with the high stand systems tract (HST) of each sequence, followed by the transgressive systems tract (TST) and the low stand systems tract (LST). This was attributed to the fact that the (HST) is dominated by more grainy sediments in association with dissolution related porosities, while the (TST) and (LST) are dominated by muddier sediments with less influence of meteoric dissolution. The results of this study might help in understanding of diagenetic processes, and consequently the porosity and permeability distribution within hydrocarbon reservoirs.

نادية عيد, مخلوف كمال

كلية الحقوق والعلوم السياسية-جامعة اكلى محند أولحاج - البويرة · الجزائر

Abdelkader Ratiat , Charifa Khouidmi , Hanane Ben Moussa Rahmani

كلية علوم الطبيعة والحياة وعلوم الارض-جامعة الجيلالي بونعامة - خميس مليانة · الجزائر

Les retenues collinaires sont des ouvrages conçus pour mobiliser les eaux de surfaces afin de permettre aux populations rurales d’exploiter les terres agricoles dans les régions où la ressource est quasiment rare.Ces ouvrages se trouvent abandonnés, nécessitent une surveillance régulière et un entretien curatif pour prévenir autant que possible tout dommage et pour leurs garantir une longue durée de viecomme le cas en particulier de la wilaya d’Ain defla, qui compte cinq petits barrages et quatre retenues collinaires.Le présent projet a pour but de traiter les techniques de surveillance appliquées dans la conservation des retenues en bon état de fonctionnement.Les résultats ont montrél’absence des considérations de responsabilité, une réduction de plus de 50% de leurs capacités de stockage comme les barrages de Telbent, Tigzel et les retenues de Rahil, Berhoune, ainsique la dégradation de certains ouvrages tels que Mellah et Skhouna, dus aux plusieurs facteurs naturels tels que (la sécheresse, l’envasement, les inondations...). De plus, L’absence de dispositifs d’auscultations au niveau des digues, rendre la vérification du comportement mécanique et hydraulique difficile et met la sécurité de ces infrastructures en doute. Il est recommandé de renforcer les travaux d’entretien au niveau de ces retenues et barrages pour leurs maintiens en état. Une situation qui exige une révision générale quant à la stratégie de gestion de ces ouvrages, en raison de leurs couts et leurs importances dans l’agriculture. Hill reservoirs are structures designed to mobilize surface water to allow rural populations to exploit agricultural land in regions where the resource is almost scarce.These structures are abandoned, require regular monitoring and corrective maintenance to prevent as much as possible any damage and to ensure a long life as the case in particular the wilaya of Aindefla, which has five small dams and four hillside reservoirs.This project aims to address the monitoring techniques applied in the conservation of dams in good working condition.The results showed the absence of responsibility considerations, a reduction of more than 50% of their storage capacity as the dams of Telbent, Tigzel and Rahil, Berhoune, as well as the degradation of some works such as Mellah and Skhouna, due to several natural factors such as (drought, siltation, floods ...). In addition, the lack of monitoring devices at the level of dams, make the verification of mechanical and hydraulic behavior difficult and puts the safety of these infrastructures in doubt. It is recommended to strengthen the maintenance work at the level of these dams and reservoirs for their maintenance.A situation that requires a general review of the management strategy of these works, because oftheir costs and their importance in agriculture.

Meriem Ayad, Zoulikha Nasri

كلية الآداب واللغات-جامعة عبد الرحمان ميرة - بجاية · الجزائر

Le premier chapitre, tentera d'expliquer ce qu'est un mythe, ce qui le distingue de certains concepts qui lui sont sémantiquement apparentés, quelles sont ses caractéristiques et ses fonctions.Le deuxième, tentera de restituer les origines du mythe, sa genèse et ses différentesadaptations dans la littérature françaiseLe troisième et dernier chapitre sera consacré à la figure mythique d'Ulysse, et au personnage bachiende Hocine. Et d'expliquer comment le mythe d'Ulysse est repris dans l'oeuvre de Salim BACHI, tout en relevant les similitudes et les différences qui se rapportent à sa réécriture

Hocine Benalla, Noureddine Hamouda

كلية علوم التكنولوجيا-جامعة الاخوة منتورى - قسنطينة 1 · الجزائر

This thesis falls within the framework of harmonic depollution of the low voltage electrical networks usingan active power compensators, this pollution is caused by the unlimited use of non-linear loads. The causes, theeffects of these harmonic disturbances and the international standards imposed to protect the consumers againstthese disturbances are presented. Also, several traditional and modern solutions against the harmonic pollution arepresented. We have focused our study on the development of the control techniques of shunt active power filter, Forthis reason, we have based on the development of methods for determining harmonic reference currents based on amultivariable filter (MVF), These new methods are able to correctly extract the reference harmonic currentsnecessary to control the SAPF, after that, we have implemented the modified (p-q) method on the power active filterin order to carry out a global active compensation of the harmonics currents, the behavior and quality of filtering ofthe APF are evaluated with two kinds of electric loads, with different types of electrical network and with aphotovoltaic power source. Then, we have developed two harmonic selective identification methods based onmultivariable filter, which are implemented in real time, in order to realise a selective active compensation ofspecific harmonic currents under low DC link voltage, this work was closed by an experimental validation of anactive power filter (APF) fed by a PMSG-based wind system, for this we implemented three controllers to controlthis system, which are the predictive current controller, Type-2 fuzzy logic controller, and an ANFIS controller. Theexperimental results obtained show that this system is capable of compensating for harmonics and reactive power,and also injected active power into the electrical network.

K. E. Bouhidel, Kafia Oulmi

كلية التكنولوجيا-جامعة فرحات عباس - سطيف1 · الجزائر

Le but de ce travail est de déterminer les phénomènes qui sont à la base du courant supracritique (dissociation de l'eau, bruit électrique, électro convection, thermoconvection..).Le tracé de la courbe courant-potentiel transmembranaire et les courbes potentiel –temps des M.E.I dans une solution d’électrolyte (fort,tampon et faible) a été effectué avec une cellule à quatre électrodes et à l'aide de l’équipement Autolab PGSTAT 30 .Le procédé expérimental est basé sur la comparaison des courbes i-V du même contre-ion avec et sans coions tampons (H2PO4- + HPO4 - -) ou d'un électrolyte faible NH3.L'évaluation de la contribution des ions H+ dans le transport du courant supracritique montre que cette contribution est de (34%) NH4+ et de (7%). pour le contre ions K+.Les résultats chronopotentiometriques traduisent la présence d'une réaction chimique pour l'ion NH4+.Le spectre de puissance du bruit électrique montre que la densité de puissance spectrale est plus importante pour les ions alcalins (Li+, Na+, K+) que pour l ion (NH4+).L'application du model théorique basé sur les équations de transport NERNST-PLANCK aux systèmes électrode MEI électrode ; Electrode/Electrolyte solide/Electrode montre l'effet des paramètres; épaisseur de la membrane, densité de courant et la présence d'un gradient de température localisé dans l’électrolyte ionique aux densités de courant élevées.

Nada Safi Haddad, Hanine Hout

كلية العلوم الاجتماعية والسلوكية-جامعة هايكازيان · لبنان

The purpose of this study was to assess the differences in self esteem and general psychological well-being including levels of autonomy, personal growth and self-acceptance between working women and non-working women. The sample consisted of randomly selected 101 Lebanese women between 250and 55 years old. The Rosenberg Self-Esteem Scale and the Ryff's Scales of Psychological Well-Being were the two tools used in this study. This study was a quantitative study that utilized the t-test, as well as the method of correlation and simple percentages. The results were significant and showed that working women score higher on the Self-Esteem Scale and the Ryff's Scales of Psychological Well-Being as well as the subscales, personal growth, self-acceptance and autonomy. This study confirmed the importance of work in increasing levels of self-esteem and psychological well-being among Lebanese women.

Djelloul Djemil Allal, Kazi Tani Nassim, Nesrine Inal

جامعة أبو بكر بلقايد - تلمسان · الجزائر

Dans notre étude on a conclu que la cystectomie est le plus souvent réalisée chez les hommes tabagiques qui présentent une TV, généralement associée à la prostatectomie chez l’homme (cysto prostatectomie).L’hématurie constitue le principal signe d’appel.L’urétéroscopie bilatérale cutanée est largement utilisée dans le service d’urologie de TLEMCEN .Les complications post-opératoires sont minimes.Souvent une chimiothérapie adjuvante est souhaitable mais malheureusement la moitié de nos patients ont refusé cette cure de chimio.

زهرة المقدم , عمر زمالة , مصطفى بوزراري

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

Abdullah Amr Elkawakjy, Cagatay Catal

كلية الهندسة-جامعة قطر · قطر

Remaining Useful Life (RUL) prediction is an essential task in predictive maintenance. This study aims to improve the performance of deep learning models for predicting the RUL of turbojet engines using the C-MAPSS dataset. The study proposes a sequence length-based dataset labeling method and evaluates pure transformer-based models on regression, with and without pertaining, and classification tasks. Different transformer based ensemble models are also evaluated. The results show that a shorter sequence length provides better performance in general. Pretraining the model does not always improve performance. The study also shows a potential for transformer-based ensemble models with careful choice of combined models. The conversion of the RUL prediction task from regression to classification resulted in low accuracy. While the transformer based architecture did not outperformstate-of-the-art hybrid models for RUL prediction, it outperformed simpler single models, such as MLP and SVR. The study concludes that, while the transformer model is state-of-the-art in natural language processing, hybrid deep learning models can outperform it in other applications such as RUL prediction.