9.Central University_Seminars
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Item A dynamic contact problem between elasto-viscoplastic piezoelectric bodies with normal compliance adhesion and damage(University Of Eloued جامعة الوادي, 2020-02-23) Maiza Laid; Tedjani Hadj ammarWe consider a dynamic frictionless contact problem between two elasto-viscoplastic piezo- electric bodies with damage. The evolution of the damage is described by an inclusion of parabolic type. The contact is modelled with normal compliance condition. The adhesion of the contact surfaces is considered and is modelled with a surface variable, the bonding eld whose evolution is described by a rst order di erential equation: .......................... We derive variational formulation for the model and prove an existence and uniqueness result of the weak solution. The proof is based on argu- ments of nonlinear evolution equations with monotone operators, a classical existence and uniqueness result on parabolic inequalities, di erential equations and xed-point arguments.Item A Hybrid Intelligent Control of A Doubly Fed Asynchronous Generator in Wind Turbine(University Of Eloued جامعة الوادي, 2020-02-23) Guediri Abdelhafid; Guediri Abdelkarim; Lammouchi zakariaThis paper presents an A Hybrid Intelligent control of a doubly fed asynchronous machine (DFAM) is proposed. First, a mathematical model of DFAM written in an appropriate d q reference f rame is established to investigate simulations results. and to maintain the constant voltage of the DC link. Performance is also tested in different situations. In order to control the rot ary currents from DFAM, the torque tracking control law is manufact ured using PI controllers; the stator side power factor is controlled at unity level. Specifically neuro fuzzy systems are created to overcome the disadvantages of neural networks and The effectiveness of the proposed control strategy is evaluated under di fferent operating conditions such as reference speed and torque step changes at nominal parameters and in the presence of a difference in the parameter. Simulation results show that the mysterious logical console is stronger than the traditional IP console in the face of differing parameters and uncertainty, and is less sensitive to torque disturbance in external load with a rapid dynamic response; Its simulated displays are then compared to the performance of th e classic PI controllerItem A Rule-based Energy Management of Solar-PV and Battery supplying Dc Load S.(university Of Eloued جامعة الوادي, 2020-02-23) S. Boualem; M.Benmeddour; M.Kermadi; H. Serhoud; M.Maamir; H.CherifThe paper presents an energy management controller (EMC) using the Rules based strategy (RBS). The system consists of a photovoltaic array with 4.6kw as the main source and an energy storage system composed of load acid battery that supplies a sta ndalone DC load. Also The power of every source (PV module, battery) is modulated via a proper side static converters. And The different components of the system are simulated under Matlab/Simulink environment. T hus t he obtained results prove the feasibili ty of the proposed approach, where the system switches smoothly between the operating modes.Item A solution based on prediction for cloud resources allocation(University Of Eloued جامعة الوادي, 2020-02-23) Djelid RaoufThe phenomenon of the clouds makes it possible to have a dynamic resource management. The effectiveness of this management becomes an important issue with the increasing size of the number of resources and the number of users. Because of a non-negligible initialization cost, a precise prediction needs must be made. In this article, we offer an approach to the prediction of the Identification based on the use of resources in the history of a platform. We represent the algorithm of resources allocation witch uses this method to assist the system to use resource allocation decisions as well as results of utilization expertise of cloud resources historical load.Item A solution based on prediction for cloud resources allocation(University Of Eloued جامعة الوادي, 2020-02-23) Djelid raoufThe phenomenon of the clouds makes it possible to have a dynamic resource management. The effectiveness of this management becomes an important issue with the increasing size of the number of resources and the number of users. Because of a non-negligible initialization cost, a precise prediction needs must be made. In this article, we offer an approach to the prediction of the Identification based on the use of resources in the history of a platform. We represent the algorithm of resources allocation witch uses this method to assist the system to use resource allocation decisions as well as results of utilization expertise of cloud resources historical load.Item A State of the Art : Heat Transfer within a MOSFET System(university Of Eloued جامعة الوادي, 2020-02-23) Oussama Zobiri; Abdelmalek AtiaThe FET (field effect transistor) is the backbone of today's semiconductor electronics. The Metal Oxide Semiconductor Field Effect Transistor (MOSFET) is the most popular type of isolated gate FET used in a variety of electronic circuits. In recent years, the MOSFET miniaturization has gained considerable interest. As the size of the device decreases ( nano-scale) , the heat generated influences the efficiency of the device. There have been many thermal studies to improve the operation of the device. This paper gives an idea on the MOSFET and heat transfer phenomena within it.Item Accès Multiple Non Orthogonal dans le Domaine de Puissance (NOMA) dans les Futurs Systèmes Mobiles(University Of Eloued جامعة الوادي, 2020-02-23) Azzouz Mourad; Ajgou RiadhL'accès multiple non orthogonal (NOMA) est l'une des techniques d'accès radio prometteuses pour l'amélioration des performances dans les communications cellulaires de prochaine génération. Par rapport à l'accès multiple par répartition en fréquence orthogonale (OFDMA), qui est une technique bien connue d'accès multiple orthogonal à haute capacité (OMA), NOMA offre un ensemble d'avantages souhaitables, y compris une plus grande efficacité spectrale. Il existe différents types de techniques NOMA, y compris le domaine de puissance et le domaine de code. Cet article se concentre principalement sur le NOMA du domaine de puissance qui utilise le codage de superposition (SC) à l'émetteur et l'annulation d'interférence successive (SIC) au niveau du récepteur. Divers chercheurs ont démontré que NOMA peut être utilisé efficacement pour répondre aux exigences des technologies de cinquième génération (5G). De ce point de vue, notre travail examine de manière les progrès récents de NOMA dans les systèmes 5G, en examinant l'analyse de capacité de pointe, les stratégies d'allocations de puissance. De plus, nous discutons les performances de NOMA peuvent être encore améliorées en le combinant avec la technologie multi-entrées multisorties (MIMO), la formation de faisceaux, le codage spatio-temporel, les ondes millimétrique. Cette thèse aborde plusieurs problèmes liés à l'allocation des ressources basée sur NOMA afin d'améliorer les performances du réseau en termes d'efficacité spectrale, de débit et …. En ce sens, des solutions théoriques et algorithmiques doivent être proposées et des résultats numériques doivent être obtenus afin de valider les solutions et vérifier la capacité des algorithmes développés à atteindre des performances optimalesItem Adaptation of Data and Comminication Security Techniques in the Context of Internet of Things(University Of Eloued جامعة الوادي, 2020-02-23) Kebache Romaissa; Laouid Abdelkader; ElMoatez Billah NagoudiThe Internet of Things (IoT) is one of the most discussed and tackled topics in the field of computer science research. Some of the researchers are also looking to the future of the world with this technology. Due to significant research and development that has taken place on the Internet of Things, various vulnerabilities have been observed that IoT should be kept as a technology subject. As a result, many attacks against the IoT were invented before its commercial implementation. In this thesis project, we seek to study in-depth the existing security techniques. Indeed, traditional security mechanisms such as firewalls, intrusion detection, and prevention systems are deployed at the Internet level are used to protect the network from external attacks. Such mechanisms must be adapted to secure the Internet of the new generation. Many security techniques have been proposed in the literature, where an in-depth analysis must be initiated to adapt some of them in the context of the IoT. As soon as the objects can include simple sensors, medical devices, cars, planes, and even nuclear reactors and other objects which can pose risks to human life, the solutions proposed must respond in particular to the restrictions and constraints posed by this type of network.Item Adding Energy Storage Materials to Improve the Productivity of Solar Distillation(University Of Eloued جامعة الوادي, 2020-02-23) Attia Mohammed El Hadi; Bellila Abdelkader; Benoudina BelkheirThe southeast region of Algeria suffers from a great socio-economic problem that affects a large population. Faced with the unavailability of drinking water, solar distillation; which appears to be a suitable and inexpensive solution; was adopted by local researchers. Improving the productivity of a solar greenhouse distiller is the subject of several researches in the world. The idea is to add energy storage materials to a single-slope solar distillation. The search for materials is more effective. This technique has a major impact on the productivity of solar distillation.Item Advanced PSO For MPPT Algorithm Under partial Shading Conditions(university Of Eloued جامعة الوادي, 2020-02-23) Bendaouad Abdelouadoud; Saber Houssem; Radjeai Hammoud; Rahmani LazharMost often the PV panels are exposed to partial shading due to cloud, buildings and trees causing multiple peaks on the power-voltage (P-V) characteristic curve. Under these conditions the conventional Maximum Power Point Tracking methods cannot track the global maximum power point GMPP, where it is trapped at the first local maximum power point. That is why this paper proposes a particle swarm optimization (PSO) method based on maximum power point tracking (MPPT) algorithm to track global maximum power point (MPP) of photovoltaic (PV) generation under partial shading conditions. To show his efficiency and its advantages, it has been compared with P&O algorithms. Experimental results show that the PSO method is effective in terms of high reliability and high accuracy in tracking the global MPPItem Aerodynamic performances of a moving H-Darrieus-type vertical-axis wind turbine(university Of Eloued جامعة الوادي, 2020-02-23) Farouk Meguellati; Fateh Ferroudji; Lakhdar Saihi; Adel Messaoudène; Khaled Koussa; Khayra Roummani; Youcef BakouThis study aims to investigate numerically a 10 kW straight-bladed Darrieus type Vertical Axis Wind Turbine (VAWT) by using fluent 6.3.26 . A symmetry NACA0018 aerofoil shape is used for the wind turbine blades. The simulations are carried out by solving the 2D Reynolds Averaged Navier-Stokes (RANS) equations in addition to the realizable k-ϵ turbulence model. The enhanced wall treatment algorithm is adopted near solid boundaries with a maximum y+ of 3. The effect of solidity (in terms of chord length) on the blade’s aerodynamic performances (lift, drag and moment coefficients) of the turbine is evaluated. Computed results show that during one revolution, the blade with a small chord length presents low moment coefficient in a range of [60°-120°] while it is higher in the range of [200°-325°] in comparison to other casesItem Amélioration de la performance thermique d'une boucle diphasique utilisée pour le refroidissement des systèmes électroniques(university Of Eloued جامعة الوادي, 2020-02-23) Amir Henka; Redha MeneceurLa modélisation et la simulation réalisées dans ce travail est pour étudier les performances thermiques en régime stationnaire d'une boucle diphasique à pompage capillaire appliquée dans le refroidissement d’un composant électronique. La méthode des volumes finis est utilisée pour analyser les phénomènes thermiques. Le système LHP (cuivre/eau) est composé d'un évaporateur comprenant une chambre de compensation et un condenseur. Les paramètres étudiés sont la puissance imposée de 20 à 100 W, la température et la résistance thermique de l’évaporateur et la ligne vapeur ainsi que l’inclinaison de l’évaporateur par rapport au condenseur (0° à 90°). Les résultats numériques ont été validés avec les données expérimentales existantes disponibles dans la littérature et ils se comparent bien avec les données expérimentales. La température et la résistance thermique de la vapeur diminuent avec l’augmentation de la puissance imposée, les valeurs maximales sont obtenues dans l’évaporateur 346 K et 0.25 K/W respectivement pour une puissance imposée de 20 W et un angle d’inclinaison θ=60°.Item An Advanced Information System for Intelligent Agriculture(University Of Eloued جامعة الوادي, 2020-02-23) Thabet Righi; Meftah Mohammed Charaf EddineIt is essential to increase the productivity of agricultural and farming processes to improve yields and cost effectiveness with new technology such as the Internet of Things (IoT). In particular, IoT can make agricultural and farming industry processes more efficien t by reducing human intervention through automation. In this study, we will study all existing technologies in this domain and then propose an Advanced Information System (AIS) for Smart Agriculture based on the Internet of Things (IoT) IoT), i t takes pre dict ive aspects and makes decisions , in particular to analyse the data (climatic, environmental and financial ...) and to draw critical information from it (diseases, water shortage, inappropriate climate..) to make the most appropriate decision (Agricultu ral Plan, Prevention, treatment, medicines, watering,....) in an intelligent environment. This system will provide real added value to smart agriculture. Finally, we will be able to ensure better crop quality and reduce all of our costs.Item An Intelligent Approach for Extremism Detection Through Social Networks (For the English Language)(University Of Eloued جامعة الوادي, 2020-02-23) BERHOUM Adel; MEFTAH Mohammed Charaf EddineRecent research indicates that extremist groups are excruciating using most social networking platforms on the Internet such as Twitter, Facebook, YouTube,......etc. to spread their ideologies and beliefs via inciting extremism and recruiting members through creating virtual online groups [1][2]. Social networking online extremism have attracted of artificial intelligence approaches, Machine Learning to classify and predict online extremism [3]. Several algorithms, techniques and approaches have been studied in the literature to counter, combat extremism and predict relevant events (table:01). In the present paper, we will highlight the problem of our research case study, the objectives to be achieved and the proposed research plan. It is within this category of applications and in the continuity of previous work that we wish to place our position, Develop the necessary features to identify negative and positive evaluations on the social web. Specifically, we are interested in characterizing the words, describing the extreme words and expressions that are expressed from a collection of comments and tweets on social networks on the webItem Application de la plasticité Associée et Non Associée pour les tôles inoxydables ferritiques(University Of Eloued جامعة الوادي, 2020-02-23) Chahaoui Oualid; Boulahrouz Salim; Ledmi MakhloufThe characterization of the drawability of rolled sheets is based on the determination of several features, which serve as a tool of mastering and understanding the behavior of those rolled sheets destined to drawing operations. The objective of this work is to compare the thresholds functions for the plastic behavior of rolled sheets through quadratic criteria Hill48 of plasticity in case of simple uniaxial stress on the metal’s plan for the mechanic values: a) Coefficient of anisotropy of Lankford b) The yield stressesItem Application of Backstepping Strategy for Induction Motor Control(University Of Eloued جامعة الوادي, 2020-02-23) ZELLOUMA Dalal; BEKAKRA Youcef; SERHOUD HichamIn this paper, a novel field-oriented induction motor using backstepping control is presented. Backstepping control is proposed for replacing the existing PI controller to obtain high performance motion control systems, for the speed, flux and currents control loops. Stability analysis based on Lyapunov theory is also performed to guarantee the convergence of the speed tracking error from all possible initials conditions. Computer simulations confirm that the proposed backstepping control scheme offers improved performance in terms of the trajectory tracking ability to time-varying reference input.Item (ASJP) دور البوابة الجزائریة للدوریات العلمیة في تطویر البحث العلمي(University Of Eloued جامعة الوادي, 2020-02-23) عكاش رشاد; قسوم فاتحوذلك بالتعریف بهذه ASJP هدفت الد ا رسة إلى تقییم جودة نظام المعلومات للبوابة الج ا زئریة للدوریات العلمیة البوابة أولا والمجالات التي تنشط فیها، ثم الوقوف على مدى تأثیرها في عوامل زیادة مردودیة البحث العلمي في الجامعة الج ا زئریة؛ كالحد من آفة السرقات العلمیة وخطورتها على مصداقیة البحث العلمي، والانفتاح على اللغة الإنجلیزیة في وقضائها على البیروق ا رطیة (APA النشر (الاقت ا رب من العالمیة) وكذا مواكبة أهم الطرق الإج ا رئیة في النشر (نظام والمحسوبیة، كما سعت هذه الد ا رسة للوقوف على بعض سلبیاتها كضعف تصنیف معظم مجلاتها؛ الذي یؤثر سلبا على طلبة الدكتو ا ره لاستكمال إج ا رءات مناقشة أطروحاتهم وتأخیر جلسات الترقیة والتأهیل بالنسبة للأساتذة الجامعیین.Item Behavior of the solutions of certain systems of non-integer differential equations(University Of Eloued جامعة الوادي, 2020-02-23) Ben Othmane Iman; Nisse LamineThis work is devoted to the generalization of certain theorems of comparisons known in the theory of ordinary differential equations,to systems of differential equations of fractional order.Item Bibliographical summary of researches carried out on the recycling and recovery of waste from mining for high-performance concrete production(University Of Eloued جامعة الوادي, 2020-02-23) Gouasmi Meriem; Babouri LaidiThe exhaustion of natural deposits of aggregates and the difficulties in opening new quarries requires the search for new sources of supply. For this, the recycling and recovery of waste is today considered a solution in order to meet the deficit in terms of production on the one hand and environmental protection . The overall objective of this paper is to reviews studies on the use of natural waste as an additional material in the further development of various recycled concretes., Such as marble powder (MP), metakaolin (MK), to discuss the effects of each waste on compressive strength, sorptivity, permeability, water absorption, chloride penetration, corrosion resistance, then assess which of these wastes is a better replacement for cement in concrete.Item Big Data Analysis for Smart Cities(University Of Eloued جامعة الوادي, 2020-02-23) Maaloul Kamel; Lejdel BrahimThe emergence of smart cities aims to solve the problems posed by the continuous development of urbanization and the increasing population density in cities. To meet these challenges, governments and policy-makers are undertaking smart city projects aimed at sustainable economic growth and a better quality of life, for both residents and visitors. Information and communication technology (ICT) is a key technology for the development of cities. However, ICT applications generate huge amounts of data called Big data. The extraction of information from Big Data is a growing trend in information systems aimed to provide better services to citizens and supporting decision-making processes. However, to extract information useful for the development of intelligent information services at the city level, the datasets generated from various areas of the city must be integrated and analyzed. This process is usually called big data analysis. The study of the literature shows a growing interest in the exploitation of big data analysis applications in general and in the field of smart cities in particular. However, in-depth discussions on the essential characteristics of big data analysis frameworks meeting the requirements of smart cities remain necessary. The objective of this project is to propose a new framework that allows the analysis of big data to manage smart cities.