Publications scientifique de l'Université de Mascara

Publications scientifiques des enseignants de l'Université de Mascara

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2019
Le pronom On dans la presse écrite : une marque d’effacement ou d’engagement énonciatifs ?
La revue : IHALAT
Domaine : Les sciences du langage
Mots Clés : locuteur, énonciateur, effacement énonciatif, engagement énonciatif, On.
Auteur : A. Mazot
Issn : 2602+7585 Eissn : vol : , Num : 4, pp : 228-240
Résume :
Notre étude s’inscrit dans le cadre de la théorie de la linguistique de l’énonciation. Notre corpus est composé d’un ensemble d’énoncés tirés de10 numéros du Quotidien d’Oran et qui s’inscrivent dans une période qui s’étend de janvier à octobre 2019. Nous nous attachons dans cette présente recherche à analyser une marque linguistique permettant au locuteur-journaliste d’introduire d’une façon explicite ou implicite son point de vue dans l’énoncé tout en exprimant des attitudes envers son énoncé et son interlocuteur. Nous nous inspirons des recherches menées par Vion ( 2001) et Rabatel ( 2003,2004, 2005) et qui consistent à proposer un appareil formel des procédés de l’effacement énonciatif. En s’inscrivant dans cette optique, nous proposons une analyse de l’usage du pronom On dans les articles du Quotidien d’Oran.
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2018
Chemical polymerization, characterization and electrochemical studies of PANI/ZnO doped with hydrochloric acid and/or zinc chloride: Differences between the synthesized nanocomposites
La revue : Journal of Physics and Chemistry of Solids.
Domaine : Materials
Mots Clés : Nanocomposites. Aniline. Zinc oxide. Zinc chloride. Electrochemical properties
Auteur : S.Daikh
Issn : 1068-3755 Eissn : vol : 121, Num : , pp : 78-84
Résume :
An in-situ polymerization method has been employed to prepare HCl-doped polyaniline (PANI)/ZnO nanocomposites and (HClZnCl2) doped PANI/ZnO. Structural characteristics were investigated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), ultraviolet spectroscopy (UV), thermogravimetric analysis (TGA) and Transmission Electron Micrographs (TEM). TGA results showed that the decomposition of the HCl doped PANI/ZnO nanocomposites was less than that of (HClZnCl2) doped PANI/ZnO nanocompositess. Conduction studies were done by using four-probe method. Electrical conductivity study shows an increase in the conductivity of the samples with the (HClZnCl2) doped) PANI/ZnO to 0.081 S cm−1. To further explore the advantages of these nanocomposites for real applications, we investigated the electrochemical properties of these samples electrodes, the (HClZnCl2-doped) PANI/ZnO nanocomposite presented much higher electrochemical response to (HCl-doped) PANI/ZnO and (ZnCl2-doped) PANI/ZnO nanocomposites.
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Optoelectronic properties of transition metals doped cubic Cadmium Sulfide
La revue :
Domaine :
Mots Clés :
Auteur : A. Abbad, H. A. Bentounes, W. Benstaali, S. Bentata, B. Bouadjemi
Issn : Eissn : vol : , Num : , pp :
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2019
3-dimensional Golden almost contact metric manifolds
La revue : Palestine Journal of Mathematics
Domaine : Mathématiques
Mots Clés : Golden manifold; Almost contact metric manifold.
Auteur : Beldjilali gherici
Issn : 2219-5688 Eissn : vol : 9, Num : 1, pp : 594-603
Résume :
In this work, we have dealt with almost contact metric structures induced by Golden structures and simultaneously as one can be obtained from the other, and provided the following results besides some side ones. Various examples are discussed.
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Experimental and Numerical Fracture Modeling Using XFEM of Aluminum Plates
La revue : International Journal of Engineering Research in Africa
Domaine :
Mots Clés :
Auteur : Ali Taghezout, Bendouba Mostefa ,Djebli Abdelkader ,Aid Abdelkarim et Habib Khellafi
Issn : Eissn : vol : 46, Num : , pp : 45-52
Résume :
In this paper a numerical modeling was carried out to study the problem of plane elasticity in a medium cracked by the method of the extended finite elements (XFEM) in a thin cracked plate made of aluminum using the software Abaqus 6.13.This method improved the capability of the classical finite element method especially the crack propagation problems. Furthermore, the extended finite elements method has been used to simulate tensile and fracture behavior of the study materials. Based on variation in size and shape of crack, the results obtained will be compared with those obtained experimentally, this comparison shows a good agreement.
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A fuzzy goal programming with interval target model and its application to the decision problem of renewable energy planning
La revue : Environmental and Ecological Statistics
Domaine :
Mots Clés :
Auteur : Amin. Hocine, Mohammed Seghir. Guellil, Eyup. Dogan, Samir. Ghouali, Noureddine. Kouaissah
Issn : Eissn : 1573-3009 vol : , Num : , pp :
Résume :
Optimizing sustainable renewable energy portfolios is one of the most complicated decision making problems in energy policy planning. This process involves meeting the decision maker’s preferences, which can be uncertain, while considering several conflicting criteria, such as environmental, societal, and economic impact. In this paper, rather than using existing techniques, a novel multi-objective decision making (MODM) model, named fuzzy goal programming with interval target (FGP-IT), is proposed and constructed based on recent developments and concepts in fuzzy goal programming (FGP) and revised multi-choice goal programming (RMCGP). The model deals with decision making problems involving a high level of uncertainty by offering decision makers a more flexible way to formulate and express their preferences, namely, fuzzy interval target goals. The proposed method is used to optimize a hypothetical sustainable wind energy portfolio in Algeria. The results show that the FGP-IT model is capable of assisting decision makers with uncertain preferences in making such complicated decisions.
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2021
NTP Security by Delay-based Detection in Intelligent Defense Systems
La revue : Journal of Telecommunication, Electronic and Computer Engineering
Domaine :
Mots Clés :
Auteur :
Issn : 2180-1843 Eissn : 2289-8131 vol : 13, Num : 1, pp :
Résume :
Nowadays, computer equipment has hardware or software clocks to which they refer to time stamp files, transactions and emails. The design of a quartz oscillator, such as clocks drift functions like ordinary watches that do not perfectly match. Therefore, it needs networked machines sharing common resources. For instance, UNIX makes command updates key files ensuring that files on which it depends exist and are up-to-date. Also, correlating log messages from several systems becomes very difficult if it does not occur at the same time. This paper focuses mainly on how to detect attacks, trying to predict attacks based on delays caused by this equipment. A server is configured using NTP protocol whose main target is to be implemented in UNIX system, to see how the NTP server is managed with the powerful package Chrony for Ubuntu. The examined results via Python reveal that clients neither will be nor able to make final decisions just after negotiating with servers in several attempts, before or after accepting their clock.
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2019
La revue : مجلة دراسات إنسانية واجتماعية
Domaine : فلسفة
Mots Clés : الدين، الفلسفة، التطور، المنهج، فلسفة الدين
Auteur :
Issn : 2253-0592 Eissn : vol : 11, Num : 08/01, pp : 155-166
Résume :
نحاول في موضوعنا طرح تحليل فلسفي لتطور العلاقة بين مجالين مهمين من حياة البشر، ألا وهما الدين والفلسفة، حيث نطمح إلى فهم التغير الحاصل في النظر إلى مفهوم وموضوع وغاية الدين عبر تاريخ الفكر الفلسفي، لفهم طبيعة الوثبة الحاصلة من فلسفات دينية إلى فلسفة في الدين وإشكال مقالنا ينطلق من وجود نقلة نوعية عرفها الفكر الفلسفي حول الدين من فلسفات دينية مجالها التسليم أو الاعتقاد ثم التعقل إلى فلسفة في الدين تتأسس على الانتقاد و التعقل دون حدود وقيود مواكبة مستجدات الواقع والعلم
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2017
Estimation of the energy of crack propagation in different zones of a welded joint by the local technique
La revue : Internatianal journal of Fracture
Domaine :
Mots Clés : Microhardness · Plastic zone · Local energy · Cracking · E48 Steel
Auteur : B. Bouchouicha, M. Zemri, A. Zaim, B. Ould Chikh
Issn : 2369-0739 Eissn : 2369-0747 vol : 192, Num : , pp : 107–116
Résume :
The fatigue damage of a material generally goes through of an incident or a heterogeneity producing a local stress concentration. The growth of crack is related to the existence of a plastic zone at the crack tip and accompanied by an energy dissipation. The objective of this study is to analyze the evolution of the energy at the crack tip during the propagation of a crack in a welded joint. In order to determine the energy nearest the end of the crack in the plastic zone, we used microhardnessmeasurements. The estimate of the total strain in each measurement point was determined by a polynomial relation between Hv and εt /2. After the determination of the average strain, the total energy in each zone was deducted. The higher value of this energy is in the Weld Metal, it is more lower in the Base Metal and even lower in the Heat Affected Zone.
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2015
Antioxidant activity and exopolysaccharide-expression of pathogenic bacteria treated with Mentha viridis extracts
La revue : Journal of Chemical and Pharmaceutical Research
Domaine : sciences de la nature et de la vie
Mots Clés : exopolysaccharides-antioxydant activity- pathogenic bacteria- mentha viridis
Auteur : T.Aicha,M.Catherine B.Mohamed, M.Boumediene
Issn : 0975-7384 Eissn : vol : 7, Num : 6, pp : 90-95
Résume :
Natural extracts contain a variety of phenolic compounds which have an antioxidant and antibacterial capacity;they can successfully replace antibiotics that show their inefficiencies against multi-resistant bacteria. In this context, this study was intended as a contribution to the understanding and evaluation of the bioactive potential of methanolic, hydro-methanolic and aqueous extracts of Mentha viridis. The qualitative analysis revealed the presence of polyphenols and flavonoids, which were confirmed-by-quantitative-analysis. The extracts of Mentha viridis expressed an important anti-production activity of the Exopolysaccharides by all pathogens strains. The amount of exopolysaccharides (EPS) produces by bacteria decreased considerably with all extracts comparatively to control (without extracts). The extracts showed strong properties to trap molecules of free radical DPPH with an inhibition power ranging from 45 to 85%. Key words: antibacterial, antioxidant, extracts, Mentha viridis, multi-resistant bacteria
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2019
Joint channel estimation and data detection for OFDM based cooperative system
La revue : Telecommunication Systems
Domaine : Telecommunications
Mots Clés : Estimation
Auteur : Mokhtar Besseghier; Djebbar Ahmed Bouzidi; Zouggaret Abdelhak; Iyad Dayoub
Issn : 1018-4864 Eissn : 1572-9451 vol : , Num : , pp :
Résume :
Orthogonal frequency division multiplexing based cooperative system using Alamouti space–time block coding at relay node represents an alternative solution to achieve better connectivity and significant enhancement to the data rate in wireless fading channels. But, these advantages cannot be achieved without an efficient estimation of the channels which becomes more challenging for cooperative communications. This paper addresses the joint channel estimation and data detection for cooperative communication systems. Indeed, equispaced pilot symbols are used by maximum likelihood (ML) algorithm to derive channels estimator, and then equalizers are calculated and applied to improve receiver data detection. The main contribution of our work is the development of the ML estimator, the corresponding Cramer–Rao lower bound, mean square error, signal to interference plus noise ratio, outage probability, bit error probability and the use of simulations to demonstrate the superior performances of the proposed methods.
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2020
Kählerian Structure on the Product of Two Trans-Sasakian Manifolds
La revue : INTERNATIONAL ELECTRONIC JOURNAL OF GEOMETRY
Domaine : Geometry
Mots Clés : Trans-Sasakian manifolds, Kählerian manifolds; product manifolds
Auteur : Habib Bouzir, Gherici Beldjilali
Issn : Eissn : vol : 13, Num : 2, pp :
Résume :
It’s shown that for some changes of metrics and structural tensors, the product of two transSasakian manifolds is a Kählerian manifold. This gives new positive answer and more generally to Blair-Oubin˜a’s open question. (See [7] and [17]). Concrete examples are given.
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Nature des états électroniques des superréseaus (Type Dimer/Trimed) désordonnés en hauteur de barrière
La revue : Lebanese Science Journal,
Domaine :
Mots Clés :
Auteur : R.Djelti, S. Bentata and Z. Aziz
Issn : Eissn : vol : 8, Num : 1, pp :
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2019
Improved IMC-Filter Design to IMC-PI Equivalence: Application to Quadrotor
La revue : IFAC-PapersOnLine
Domaine : Control
Mots Clés : Reference model IDA-PBC Autonomous UAV Internal energy Tracking control
Auteur : Yasser Bouzid, Houria Siguerdidjane, M Zareb, Yasmina Bestaoui.
Issn : 2405-8963 Eissn : 24058963 vol : 52, Num : 12, pp : 158-163
Résume :
This paper proposes a method to reach the equivalence between an IMC and a PI controller regardless of the model order. To this end, the key idea consists of using a specific IMC filter that exhibits a good level of robustness and further leads to get a structure of a PI controller whatever the order of the model is. The developed procedure constitutes the main contribution of this paper. To meet given set of specifications, the controller parameters are tuned through a straightforward analytic way using the dynamics of the tracking error. Furthermore, in order to evaluate the efficiency level of this procedure, an application to control an autonomous vehicle is described and the simulation results are shown to be satisfactory.
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2020
On The Structure Of Powers Of Toeplitz Matrices
La revue : Applied Mathematics E-Notes (AMEN)
Domaine : Mathématiques Mathematics Subject ClassiÖcations: 20F05, 20F10, 20F55, 68Q42.
Mots Clés :
Auteur : T.M. Mohamed, K. Ismaiel, S. Abderrahmane.
Issn : 1607-2510 Eissn : vol : 20(2020), Num : , pp : 199-203
Résume :
A finite Toeplitz matrix T is normal if and only if it is a rotation and a translation of a Hermitian Toeplitz matrix (Type I) or it is a generalised circulant (Type II). In this paper, we show that the powers of a Type II matrix T are also Type II.
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2018
The Stress Triaxiality Effect under Large Plastic Deformation of a Polybutylene Terephthalate (PBT)
La revue : International Journal of Engineering Research in Africa,
Domaine : sciences des matériaux
Mots Clés : Triaxiality, Plastic instability, polyester; Damage
Auteur : Abdel-Nour Zaim, Benattou Bouchouicha, Meddah Hadj Miloud, EL Bahri Ould Chikh
Issn : 1663-4144 Eissn : vol : 34, Num : , pp : 13-28
Résume :
In this work, we focus on a new generation of polymer named Polybutylene terephthalate (PBT). In order to analyse and determine true behaviour of this polymer, a special experimental method was used. Hence, the true stress/strain responses are investigated under a large plastic deformation in different stress triaxiality frameworks with a particular attention on the volumetric strain evolution, with their decomposition to an elastic volumetric strain, plastic volumetric strain and the pure shear. Moreover, the effect of stress triaxiality on the plastic instability and the fracture strain is also examined. With the plastic instability analysis, it was found that plastic strain hardening increases gradually with the triaxiality. Finally, in order to evaluate the damage of this polymer, a theoretical damage formula is proposed.
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2015
3. Morphological and physicochemical properties of dip-coated poly (2,5-diyl pyrrole) [4-nitrobenzylidene] (PPNB) thin films: towards photovoltaic applications
La revue : Eur. Phys. J. Appl. Phys
Domaine : Chimie
Mots Clés :
Auteur : Y. Mouchaal, H. Gherras, A. B. Reguig, A. Hachemaoui, A. Yahiaoui, M. Makha, A.Khelil, J-C. Bernede
Issn : Eissn : vol : , Num : , pp :
Résume :
A new material: conjugated poly {(2,5-diyl pyrrole) [4-nitrobenzylid`ene]}, that we called (PPNB), has been synthesized and characterized. The cyclic voltammetry has been used in order to estimate first oxidation (Ep) and reduction (En) potentials of our polymer. These values have been assigned, respectively, to the position of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) and determination of the energy band gap which have been estimated to be 6.16, 3.89 and 2.27 eV respectively.
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2020
Fabrication and Characterization of Poly (aniline-co-4-bromoaniline)/Сlay Nanocomposite
La revue : Polymer Science, Series B
Domaine : Chimie
Mots Clés : Copolymer synthesis, solubility, poly(pyrrole-co-2-nitrocinnamaldehyde), pyrrole, 2-nitrocinnamaldehyde
Auteur : N. E-h. Bouabida, A. Hachemaoui, A. Yahiaoui, H. Gherras, A. Belfedal, A. Dehbi, , A. H I. Mourad
Issn : 1560-0904 Eissn : vol : 62, Num : 02, pp :
Résume :
Poly(aniline-co-4-bromoaniline) nanocomposites were prepared via in situ polymerization in different molar ratio in the presence of Cu2+−monmorillonite. The X-ray diffraction confirmed that the basal space of Cu2+−montmorillonite increased after the organophilization. Poly(aniline-co-4-bromoaniline)/ Cu2+−monmorillonite nanocomposites were prepared by intercalating of aniline and 4-bromoaniline with treated organically layers of Cu2+−monmorillonite following by polymerization initiated by ammonium peroxdisulfate. The nanocomposites were characterized by FTIR, XRD, and UV–Vis spectroscopy.
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2021
المناخ التنظيمي وضغوط العمل علاقة مركبة بين الحتمية و ضرورة العلاج. Organizational Climate And Pressures Of Work ,a Complex Relationship Between Inevitability And Necessity Of Treatment
La revue : المجلة الجزائرية للعلوم الإجتماعية والإنسانية
Domaine : إدارة الموارد البشرية
Mots Clés : المناخ التنظيمي , ضغوط العمل ، الاتصال الفعال ، إدارة الضغوط الوظيفية ، الموارد البشرية .
Auteur : H.Assia,D.khaoula- Z.Hayet
Issn : Eissn : 2602-6058 vol : Volume 9, , Num : Numéro 1, pp : , Pages 74-101
Résume :
يشير المناخ التنظيمي إلى التفاعل بين خصائص الفرد المرتبطة إلى حد كبير بالنظام المعرفي والخبرات والتجارب والتعليم والثقافة و بيئة العمل التي تميز المنظمة عن غيرها من المنظمات وتختلف من منظمة إلى أخرى باختلاف الأبعاد التي تحدد المناخ التنظيمي من هيكل تنظيمي ، مركزية القرار،اتصالات،أنظمة أجورو حوافز،نمط القيادة،التكنولوجيا. أكدت الدراسة التالية وجود ارتباطات ذات دلالة إحصائية إيجابية مهمة ومتفاوتة التأثير بين ضغوط العمل والعوامل السابقة ، في إطار مناخ تنظيمي ملائم يعمل كوسيط ناجع بين متطلبات الوظيفة والحاجات المهنية للأفراد.
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irst principle study of spintronic properties for double perovskites Ba2XMoO6 with X =V, Cr and Mn
La revue :
Domaine :
Mots Clés :
Auteur : A. Souidi, S. Bentata, W. Benstaali, B. Bouadjemi, A. Abbad, T. Lantri
Issn : Eissn : vol : , Num : , pp :
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2019
La Gouvernance Bancaire, En Algérie, à L'épreuve De La Crise Pétrolière : Défis Et Enjeux.
La revue : Finance & marchés
Domaine : Economie et Econométrie
Mots Clés : Partenariat ; Accord d’association ; Modèle d’équilibre général calculable ; Matrice de comptabilité sociale ; Algérie ; Union européenne
Auteur : Z. M'hamed ; R. Lotfi
Issn : Eissn : 2602-5191 vol : 6, Num : 2, pp : 22-46
Résume :
Dans cette étude, nous tentons d’analyser les perspectives de l’économie algérienne dans le contexte actuel de chute des prix pétroliers sur le système bancaire et le développement économique. Pour cela, nous discutons la question de la gouvernance de système bancaire algérien et ses défis face à cette nouvelle conjoncture pétrolière, et qui place l’Algérie devant des choix difficiles accompagnée par un recul de 30% de la fiscalité pétrolière, une essence pour les plans de dépenses du gouvernement.
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GGA+U Study of electronic and magnetic properties of Pr(Fe/Cr)O3 cubic perovskites,
La revue : Journal of supercond.
Domaine :
Mots Clés :
Auteur : M. Rezaiguia, W. Benstaali, A. Abbad, S. Bentata, B. Bouhafs
Issn : Eissn : vol : , Num : , pp :
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Semi-Blind Estimation of CFO and Channels for STBC-OFDM System
La revue : International Journal of Computer Aided Engineering and Technology
Domaine : Telecommunications
Mots Clés : Estimation CFO
Auteur : Mokhtar Besseghier; Djebbar Ahmed Bouzidi
Issn : 1757-2665 Eissn : 1757-2657 vol : , Num : , pp :
Résume :
Space Time Block Coding-Orthogonal Frequency Division Multiplexing (STBC-OFDM) based MIMO (Multi Input Multi Output) system has been shown to be robust against non ideal operating conditions such as antenna correlation, channel estimation errors, and Doppler effects. But, the later suffers from carrier frequency offset (CFO) which makes channels estimation more challenging.rnIn this paper, we propose joint semi-blind CFO and channels estimators based on modified- multiple signal classification (M-MUSIC) algorithm for STBC-OFDM system over MIMO channels. Channels state information can be estimated at the receiver using pilot symbols embedded in each transmission block. To this end, we propose to encode pilot symbols by a Specific Space-Time Block Coder (S-STBC) while information symbols are encoded by Alamouti based space-time block coding (A-STBC). MUSIC based estimation algorithms are characterized by a high computational complexity. To overcome this drawback, we derive an iterative algorithm which leads to low complexity, high performance CFO and channels estimation. The performance of our algorithms is compared with existing approach by simulations.
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2016
PANI-derived polymer/Al2O3 nanocomposites: synthesis, characterization, and electrochemical studies
La revue : Colloid and Polymer Science
Domaine : Materials
Mots Clés : Polyaniline 2-Chloroaniline Aluminum oxide Nanocomposite Electrochemical properties
Auteur : S. Benykhlef
Issn : 0303-402X Eissn : vol : 294, Num : , pp : 1877-1885
Résume :
This paper presents the physicochemical, conductive, and electrochemical properties of different polyaniline (PANI)-derived polymer/Al2O3 nanocomposites synthesized by chemical oxidation polymerization method carried out in two stages: first, activation of the surface of the Al2O3 nanoparticles by hydrochloric acid and second, polymerization of 2-chloroaniline (2ClANI), aniline (ANI), and the copolymer (2ClANI-ANI) in the presence of Al2O3 by using ammonium persulfate as oxidant in aqueous hydrochloric acid. XRD and TEM results reveal the growth of the polymers on Al2O3 nanoparticles and the formation of PANI-derived polymer/Al2O3 nanocomposites. FTIR and UV-Vis show a systematic shifting of the characteristic bands of the polymers with the presence of Al2O3 nanoparticles. Moreover, these nanoparticles enhance the thermal stability of the polymers, as found by thermogravimetric analysis (TGA). Although the incorporation of Al2O3 nanoparticles reduces the electric conductivity of the polymers, the resulting nanocomposites still keep high conductivities, ranging between 0.3 × 10−2 and 9.2 × 10−2 S cm−1. As a result, the polymer/Al2O3 nanocomposites exhibit a good voltammetric response. All these synergetic features of the nanocomposites are assigned to the effective interaction of the polymers and Al2O3 particles at nanoscale.
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Electronic transmission in random trimer InAs/In x Ga1 superlattices
La revue :
Domaine :
Mots Clés :
Auteur : S.Terkhi, S.Bentata, R.Djelti, B.Bouadjemi
Issn : Eissn : vol : , Num : , pp :
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Fuzzy Farthest Point First Method for MRI Brain Image Clustering
La revue : IET Image Processing
Domaine : Informatique
Mots Clés : Fuzzy ; MRI Image Clustering
Auteur : D. Mohammed
Issn : Eissn : vol : 13, Num : 13, pp : 2395-2400
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2018
Combining and comparing different machine learning algorithms to improve dissolved gas analysis interpretation
La revue : IET Generation, Transmission & Distribution
Domaine : Electrotechnique
Mots Clés : DGA, Power transformer, Diagnosis, Machine learning, Ensemble technique
Auteur : Mohammed El Amine Senoussaoui , Mostefa Brahami, Issouf Fofana
Issn : 1751-8687 Eissn : 1751-8695 vol : 12, Num : 15, pp : 3673-3679
Résume :
Since the discovery of dissolved gas analysis (DGA), it is considered as a leading technique for the diagnosis of liquid insulated power equipment. However, accurate analysis results can only be achieved if the measured gases closely reflect the actual equipment condition to enable an appropriate interpretation of these gases. In general, conventional techniques such as the ratio method, key gases, and Duval triangle combined or not with artificial intelligence techniques such as machine-learning algorithms are used for DGA interpretation. Here, four well-known machine-learning algorithms are compared in terms of DGA fault classification – Bayes network, multilayer perceptron, k-nearest neighbour, and J48 decision tree. Moreover, the effect of applying ensemble methods such as boosting through the Adaboost algorithm and bootstrap aggregation (bagging) is analysed, and the performances of these algorithms are evaluated. The data for developing classification models was transformed into three forms, other than the raw data. The obtained results clearly presented the efficiency and stability of some algorithms such as the J48 tree and Bayes networks for DGA fault classification, in particular, when the data is appropriately pre-processed. Moreover, the performance of these algorithms was found to consistently improve by integrating the concepts of multiple models or ensemble methods.
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Experimental and Numerical Analysis of the Polyvinyl Chloride (PVC) Mechanical Behavior Response
La revue : Computers, Materials and Continu CMC
Domaine :
Mots Clés :
Auteur : KHELLAFI Habib , Meddah Hadj miloud, OuldChikh El Bahri,Bouchouicha Benattou, Benguediab Mohamed et Bendouba Mostefa
Issn : Eissn : vol : 49, Num : 1, pp :
Résume :
The polyvinyl chloride PVC is a polymer material widely used for a large variety of applications. The present work focuses on the identification of the physical processes responsible for the mechanical properties of the PVC containing different crystallinities rate applied in large deformation and different strain rates. In order to understand the behavior of the PVC, a thermodynamic modeling is needed. Therefore, the contribution of this approach was demonstrated by experiment and numerical modeling. This comparative study demonstrates that the proposed model provides better agreement with experimental evidence.
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2017
A Novel Conducting Nanocomposite Obtained by p-Anisidine and Aniline With Titanium(IV) Oxide Nanoparticles: Synthesis, Characterization, and Electrochemical Properties
La revue : Polymer Composites
Domaine : Materials
Mots Clés : Hybrid materials Nanoparticle Zinc oxide 4-Chloroaniline Electrical conductivity
Auteur : F. Chouli
Issn : 1548-0569 Eissn : vol : 38 , Num : , pp : 254-260
Résume :
Nanocomposites were successfully synthesized by the oxidative polymerization of p‐anisidine and/or aniline monomers (at initial “p‐anisidine:aniline” mole ratios of “100 : 0,” 50 : 50,” and “0 : 100”) with titanium(IV) oxide nanoparticles, in the presence of hydrochloric acid as a dopant with ammonium persulfate as an oxidant. The morphological, structural, conductivity, and electrochemical properties of the synthesized nanocomposites were studied using Transmission Electron Microscopy, X‐ray diffraction, Fourier transform infrared spectroscopy, and UV–vis spectroscopies. The presence of polymer on TiO2 nanoparticles in samples nanocomposites was confirmed by the Transmission Electron Microscopy coupled with Energy Dispersive X‐ray Spectroscopy. The thermal stability of samples nanocomposites were evaluated using the Thermogravimetric Analysis. Electrical conductivity of nanocomposites obtained is in the range of 0.08 − 0.91 S cm−1. The electrochemical behavior of the polymers extracted from the nanocomposites has been analyzed by cyclic voltammetry. Good electrochemical response has been observed for polymer films; the observed redox processes indicate that the polymerization on TiO2 nanoparticles produces electroactive polymers. These composite microspheres can potentially be used in commercial applications as fillers for antistatic and anticorrosion coatings. POLYM. COMPOS., 38:E254–E260, 2017. © 2015 Society of Plastics Engineers
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2015
Factors Affecting CO2 Emissions in the BRICS Countries: A Panel Data Analysis
La revue : Procedia Economicsand Finance "Elsevier"
Domaine : Economie
Mots Clés :
Auteur : Yassine Zakarya GHOUALI, Mohammed Abbes SAHRAOUI, Mostéfa BELMOKADDEM, Mohammed Seghir GUELLIL
Issn : 2212-5671 Eissn : vol : 26, Num : , pp : 114-125
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