Communications Internationales
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Item Analyse du cycle de vie comparative des impacts environnementaux de deux systemes d’eclairage public(Faculté des sciences de l’ingénieur : Département de Génie des Procédés : Laboratoire de Recherche en Technologie Alimentaire - L.R.T.A, 2018)Item A Practical Integrated Fault Location Technique for Radial Power Distribution Systems(IEEE, 2019) Hamadouche, Tarek; Bendjeghaba, Omar; Ahriche, Aimedpower distribution systems (PDS) are becoming more complex and dispersed at long distances and different locations. With its radial and several laterals configuration, loads could be connected at similar distances from the substation which leads to a multi estimation of fault location and consuming more time for iterative fault location algorithms. In order to overcome those difficulties, a practical integrated fault location method for radial PDS is presented in this paper. The basic idea of the proposed approach is to partition a multi lateral distribution system to possible mono lateral system (MLSs) by a proposed communicant sensor (CS). Then an impedance based algorithm is applied only at the faulty MLS. To examine the whole method in the field, a real PDS from the Algerian distribution grid is used. Experimental results present significant benefits compared to a previous method reported in the literature.Item Characterization of used engine oil and possibility of recovery(2018) Zerdane, Youghourta; Hachemi, M.; Tazrout, M.; Largeau, Jean-FrançoisThe world today is facing major energy and climate challenges. The growth of global energy demand, the decline in fossil reserves and the dangerous disruption of the climate caused by pollution compels states and scientists to quickly adopt plans strengthened action on renewable energies and the treatment of different types of waste generated by human activity, such as used motor oils in order to preserve the environment and to find other sustainable and economically viable solutions. This work, based on a characterization study of used motor oil, has shown that these characteristics deteriorate after a certain time of use compared to a new oil and that they become polluting due to contamination by inorganic elements (metal). The high calorific value of the used oil can be considered as an important source of energy, hence the need to develop a process for the upgrading of this waste and for this purpose it is envisaged to explore later one of these ways which is pyrolysisItem An application of PMU in solar energy generation Plant Connected Power Grid(2019) Mahboubi, Meriem; Bentarzi, Hamid; Ouadi, AbderahmaneSolar energy is one of the most abundant green energies in our planet. In order to satisfy the world demand of electrical energy, solar energy may be used. Identical to all other types of power generation plants, the integration of the solar energy source in power grid has an impact on its operation. Thus, when the electrical power is injected into the power grid by the solar energy source, the system electrical parameters must be well monitored for synchronization purpose. This can be accomplished with the aid of synchro-phasors measurement units. The phase angle of the utility is a critical parameter for the operation of power devices feeding power into the grid like PV inverters. There are many techniques to obtain the grid phase angle such as the zero-crossing detection and the orthogonal phase locked loop. This research work discusses the use of PMUs (Phasor Measurement Unit) for providing this important parameter to system synchronization in the case of high penetration of solar energy in the power gridItem Vulnerability assessment of an existing reinforced concrete shear wall building(2019) Oumedour, Amira; Lazzali, FarahThe present study focused on assessing seismic vulnerability of an existing dwelling building with reinforced concrete shear walls, designed according to previous standards without seismic design. Firstly, visual inspection of the building is performed in order to identify defects, then, qualitative seismic vulnerability is assessed using existing methods. Finally, the compliance of the structure with some requirements of the current Algerian seismic regulations is examined.Item Vérification d'une méthode de preuve pour la logique de description ALC(2010) Chaabani, Mohamed; Mezghiche, Mohamed; Strecker, MartinLes logiques de description (DLs) sont une famille de langages utilisés pour la représentation et le raisonnement sur des connaissances d’un domaine d’application d’une manière structurée et formelle. Pour atteindre cet objectif, plusieurs raisonneurs ont été implantés, comme RACER et FACT++. Toutes ces implantations n’ont pas encore été certifiées. Pour garantir la correction des déri- vations des propriétés dans les DLs, il s’avère nécessaire de valider formellement le processus de raisonnement appliqué aux DLs. Dans ce papier, nous présentons une définition d’un raisonneur pour la logique de description ALC basé sur la méthode du tableau sémantique. On assure la validité de notre raisonneur par la preuve des propriétés de son adéquation, de sa complétude et de sa terminaison dans l’assistant de preuve Isabelle/HOL. La preuve procède en deux étapes: elle établit les propriétés sur un niveau abstrait, ensembliste, et les instancie ensuite pour une implantation sur des listes.Item Integrating Superficially Treated 2024 Aluminum Alloy in Steel Drill String to Deal with Fatigue Problem in Crooked Trajectory for Vertical Deep Well(Springer International Publishing, 2017) Belkacem, Lallia; Abdelbaki, Noureddine; Gaceb, Mohamed; Bouali, Elahmoun; Hedjaj, Ahmed; Bettayeb, MouradDrilling deep HPHT wells is the most compelling reason for drilling companies to look for alternative drill pipes that meet their requirements. Currently, with the emergence of drill pipes made of materials other than steel, a thorough study of superficially treated 2024 aluminum alloy combined with steel drill pipe in crooked well trajectory is presented in this study. Basically; this study is built on several parameters that affect fatigue resistance of a drill pipe such as fatigue endurance limit of the drill pipe material, drill pipe specification, torque and drag loads applied, dog leg severity, besides crooked trajectory. Chiefly, this paper shows a full study about 2024 aluminum alloy drill pipe and analyzes the prospect of using aluminum drill string for deep wells while the fatigue, torque and drag as well as drilling efficiency and drill string integrity stay acceptable. It also gives a better comprehension of the mechanical behavior of lightweight material for drill pipe, which can significantly improve well planning in order to drill wells with an increasing depth, length and complexity. Additionally, even though steel drill pipe has better mechanical properties in terms of density, Young’s modulus, yield and tensile strength, than 2024 aluminum alloy drill pipe, the latter has a good fatigue resistance even in the simultaneous presence of high applied torque and axial load, and severe doglegs, which makes the use of other options (Steel Drill Pipe and Titanium Drill Pipe) impractical from the fatigue failure standpoint. Finally we can assume that, there is significant cost saving with the use of Aluminum Drill Pipe compared to steel drill pipes, because the ratio of the engine power needed to supply the drilling fluid at the required pressure for ADP versus steel drill pipe is lower, leading to a reduction in fuel consumption.Item Identification of vibratory characteristics to the damage of a composite plate(2018) Grabi, Massinissa; Chellil, A.; Lecheb, Samir; Mechakra, H.; Nour, A.; Andrianarison, O.tThe objective of this work is to study the damage behavior of composite structures by examining the influence on fatigue resistance. The finite element model of the plate will allow to analyze the vibratory behavior, to identify the stress, to study the influence of the dynamic loads on the natural frequencies of the plate in bending and torsion and will show the influence of the orientation of the Composite fiber macros on the rigidity of the plate and finally calculate the stability of the plate. The various damage mechanisms associated with these materials will also be presented with particular attention to delamination and cracking. This work will then focus on different technologies to improve the mechanical properties of these composite materials.Item Numerical investigation on combustion characteristics of both diesel and dual fuel engine at part load conditions using converge cfd(2019) Benbellil, Messaoud Abdelalli; Lounici, Mohand Said; Loubar, Khaled; Ouchikh, SarahPetroleum resources are nite and, therefore, search for their alternative non-petroleum fuels for internal combustion engines is continuing all over the world. Moreover, gases emitted by petroleum fuel-driven vehicles harm the environment and human health. Dual-fuel engine (diesel/NG) represents one of a possible solution to reduce emissions from a diesel engine. Therefore, this method has been given a lot of attention from many researchers to improve engine performance and reduce diesel consumption, particularly at full loads. However, it is necessary to study the dual-fuel (DF) combustion process with more details at part loads, due to the poor performance at these conditions. This study numerically investigated the e ect of DF (dual fuel) operating mode on combustion characteristics of an existing diesel engine using natural gas as primary fuel and neat diesel as pilot fuel at part loads by adopting a 3D-CFD simulation using the code CONVERGE. A series of numerical simulations were carried out, the purpose of which to gain a better understanding of the combustion behavior in dual-fuel engines. The results are rst validated using experimental data. A comparison with neat diesel fuel operation is achieved.Item Robust Controllability and Observability tests of Linear Time-delay Systems with Parametric Uncertainties using Interval Analysis(2018) Khelouat, Lila; Ahriche, A.In this paper, robust controllability and observability problem of linear time-delay systems with parametric uncertainties is considered. A functional-based transformation is first presented, which transforms the system with delayed measurements into a system without delay formally. Based on the transformed system, we develop an effective method for checking the robust controllability and observability tests of the uncertain system using interval analysis.