Benlahreche F.Z.,Constantine3 University |
Nouicer E.,Constantine1 University
Acta Physica Polonica A | Year: 2017
This work aimed to improve the physicochemical properties of a low carbon steel C15 by a nitriding treatment in a salt bath at 580 °C. The micrographs of treated sample show that the nitriding treatment causes significant structural changes, it is allowed to delineate the nitriding layer. The X-ray diffraction and the Raman spectroscopy of the treated samples permitted to identify different nitrides (Fe2-3N, Fe4N) formed. The obtained hardness profile determines the nitriding depth. Potentiodynamic curves show that the corrosion current density of treated C15 is the 10 times lower than untreated specimen. The values of impedance parameters obtained after nitriding treatment indicate that the resistance values and exponent n increase, whereas the capacitance decreases. We concluded that the nitriding treatment is an effective method for improvement of the corrosion behavior and surface properties of the low alloy steel C15.
Dahmani D.I.,University of Constantine 3 |
Dahmani D.I.,Constantine1 University |
Dahmani D.I.,Laval University |
Sifi K.,University of Constantine 3 |
And 8 more authors.
International Journal of Pharmaceutical Sciences Review and Research | Year: 2016
The aim of this study was to investigate the potential link between the IL-4 gene, the levels of IgE and IL-4, atopic asthma and the incidence of eczema and allergic rhinitis in a young adult population. A total of 80 patients with atopic asthma and 80 non-atopic, non-allergic and non-asthmatic controls were included. Atopic asthma was confirmed by means of the skin prick test, The IgE levels were measured by Quantia IgE immunoturbidimetric assay, while, Interleukin (IL)-4 concentrations were determined by immunosorbent assay. IL-4 C-589T polymorphism was determined by the polymerase chain reaction-restriction fragment length polymorphism method (RFLP-PCR) using the BsmF1 enzyme. Gene analyses reviled that, the IL-4 C-589T SNP shows a significant difference between asthmatic and controls when comparing the TT vs CC (OR, 3.63; OR 95% CI, 1.16-11.63; p=0.01) and TT vs CT (OR, 2.48; OR 95% CI, 0.91-6.95; p=0.05) genotypes. Likewise, a significant association was found between the TT genotype and the positive family history of asthma (OR, 3.78; OR 95% CI 0.93-17.78; p=0. 036) and positive parental smoking (OR, 3.16; OR 95% CI 0.85-12.80; p=0.05). On the other hand, the personal history of allergic rhinitis and eczema demonstrated a significant association of the CT and TT genotype with both allergic rhinitis (p = 0.04) and eczema (p=0. 005) in the asthmatic group. We also demonstrated that patients with heterozygous CT (55%) and homozygous TT (23.75%) genotypes of the IL-4 C-589T polymorphism showed significantly higher of IgE levels (631.89±187.35 IU/ml, and >1000 IU/ml, respectively) (p=0.0000) and serum levels of IL-4 (>1000) for the TT genotype and (495. 96 ± 93.57) for heterozygote variant of IL-4 C-589T CT (p=0.0000). Our findings revealed that women are much more likely to develop asthma than men. We also showed a strong association between TT genotype and the incidence of eczema and allergic rhinitis in childhood. © 2016, Global Research Online. All rights reserved.
Taouche C.,University of Oum El Bouaghi |
Taouche C.,Constantine2 University |
Batouche M.C.,University of Oum El Bouaghi |
Chemachema M.,Constantine1 University |
And 2 more authors.
STA 2014 - 15th International Conference on Sciences and Techniques of Automatic Control and Computer Engineering | Year: 2014
Face recognition is one of the most important tasks in computer vision and biometrics where many algorithms have been developed. The Local Binary Pattern (LBP) has been proved to be effective for facial image representation and analysis, but it is too local to be robust. In this paper, we present an improved method for face recognition named Elongated Multi-Block Local Ternary Pattern (EMBLTP), which is based on Local Binary Pattern (LBP).The proposed method is tested on Yale face database and compared with different variants of LBP. Experimental results show that, the classification rate of the proposed method is appreciable. © 2014 IEEE.
Missoum I.,Constantine1 University |
Benhaliliba M.,Oran University of Science and Technology - Mohamed Boudiaf |
Chaker A.,Constantine1 University |
Ocak Y.S.,Dicle University |
Benouis C.E.,Oran University of Science and Technology - Mohamed Boudiaf
Synthetic Metals | Year: 2015
The fabricated Ag/MgPc/n-GaAs/Au-Ge Schottky diode is investigated by using the electrical parameters obtained from the current-voltage (I-V) characteristics measurement at room temperature under dark and light conditions. The Cheung and Norde methods with the I-V characteristics are used to calculate and extract the Schottky diode parameters under dark and light (100 mW/cm2) comprising ideality factor n, barrier height (Φb), series resistance (RS) short circuit current density (JSC) and open circuit voltage (VOC) are respectively found to be 3.64, 0.53 eV, 32.67 Ω, 1.129 mA/cm2 and 0.35 V. It is seen that the value of RS and JSC are low compared to the literature work which is ascribed to the configuration of Schottky diode structure such as substrate, front and back contacts. Here, we review the contribution to the understanding of magnesium phthalocyanine (MgPc) based Schottky diode for the organic microelectronics applications. © 2015 Elsevier B.V. All rights reserved.
Kebaili S.,University of Oum El Bouaghi |
Benalla H.,Constantine1 University
Journal of Electrical Engineering | Year: 2014
System power reliability under varying weather conditions and the corresponding system cost are the two main concerns for designing stand alone photovoltaic systems (SAPV). An energy cost evaluation of a SAPV using sinusoidal profile is developed. This paper presents, for a first time, the more accurate mathematic models for characterizing PV module, battery and converters (DC/DC and DC/AC). Secondly, a methodology for studying the impact profile load parameters on the energy cost of an SAPV is proposed. Two cases are considered, unitary and constant efficiencies. The results obtained give the minimum energy cost and downsizing of the system during 30 years of the life cycle for each case.
Sief Ali S.,Constantine1 University |
Pruski A.,University of Lorraine |
Abdelhak B.,Constantine1 University
2013 3rd International Conference on Systems and Control, ICSC 2013 | Year: 2013
The study of vehicle navigation in constrained space depends on both the mobile base and on the assigned task. However, it always leads to considering the problem in term of path finding in the admissible space. In this paper, we demonstrate the existence of a feasible trajectory for person on wheelchair during the assessment of accessibility of habitat. The objective is to evaluate the accessibility to the mobility and to the reachability. The calculation of the trajectory for a person in wheelchair is not necessary because he/she always executes a trajectory that seems to him the most comfortable. According to that, we just prove the existence of at least one feasible trajectory for wheelchair. © 2013 IEEE.
Benzaid K.,Constantine1 University |
Mansouri N.,Constantine1 University |
Labbani-Igbida O.,University of Picardie Jules Verne
2013 3rd International Conference on Systems and Control, ICSC 2013 | Year: 2013
In this paper, we present two control strategies of a quadrotor Unmanned Aerial Vehicle (UAV). The dynamics of the system is controlled to achieve a complex trajectory tracking. A controller using the integral backstepping is developed for the stabilization of the six degrees of freedom (6DoF) of the system. Furthermore, we propose a hybrid strategy by combining the integral backstepping and the PID linear controller. For this, we divide the dynamic system into two subsystems; each one with 3DoF. For the stabilization of the rotational dynamics, the PID controller is proposed. The Integral Backstepping is applied for the longitudinal, lateral and vertical position stabilization. Finally, some numerical simulations are conducted to illustrate the robustness of both strategies. © 2013 IEEE.
Boumaiza M.,Constantine1 University |
Labed D.,Constantine1 University
IET Generation, Transmission and Distribution | Year: 2016
In this work, the authors have studied the interaction between electromagnetic fields which are generated by lightning and overhead line in electrical power system. For this study, the authors constructed a system of equations. In which the network topology; with all its elements (linear or not) and wave exciter lightning are taken into account. This analysis is developed in time from the general equations of transmission lines with second members, with consideration of the frequency dependence of the correction terms related to the impedance of a finite conductivity of ground as well as non-linearities loads. The simulation results presented in this study demonstrate the effectiveness of this analysis for the calculation of induced voltages generated by lightning on a grid of lines. © 2016. The Institution of Engineering and Technology.
Mezdour D.,Jijel University |
Tabellout M.,CNRS Le Mans Institute of Molecules and Materials |
Bardeau J.F.,CNRS Le Mans Institute of Molecules and Materials |
Sahli S.,Constantine1 University
2014 North African Workshop on Dielectric Materials for Photovoltaic Systems, NAWDMPV 2014 | Year: 2014
The present work deals with the preparation of films from polymeric core-shell particles. Our approach is based on the chemical polymerization of a very thin layer of polyaniline (PANI) around particles of transparent polymers (polyamide and polystyrene). Films are then obtained by dissolving the two type synthesized core-shell powders in dichloromethane and m-Cresol respectively. Electrical properties were investigated using a dielectric relaxation spectrometer. Both composite films exhibited a percolative behaviour and a well established dc conductivity for high PANI concentration related to the conductive properties of the PANI spanning clusters. This property allows using such films in semi-conductive applications. For polyamide films, high dielectric constants were obtained at 5 wt. % of PANI allowing their use as high k-dielectrics compatibles with organic printed circuit boards. © 2014 IEEE.
Miles A.,Constantine1 University |
Khemis O.,Constantine1 University
UPB Scientific Bulletin, Series D: Mechanical Engineering | Year: 2015
This work is a simulation of a gas-solar hybrid power station which functions according to a system of combined cycle. The solar field, made up of sensors trough parabolic collector is integrated, like supplement, with the cycle of Rankine with only one stage of pressure. This integration is well adapted to guarantee a minimal availability of power whatever the fluctuations of the solar radiation. We propose a model of a hybrid power station, composed of a system of combined cycle solar integrated (ISCCS). The energy study is carried out with the Aspen plus (HYSYS) simulator. The values of the energy gained by the solar heat collector are given by using the solar data of the Algerian site of Hassi R'mel. The variations of the principal parameters of the cycle with vapor, according to the solar contribution, are given for a power station producing approximately 150 MW equipped with two gas turbines and a train of stream turbine. The results obtained enabled us to determine the optimal conditions for better power of the steam, to evaluate the energy contribution provided by the solar as well as the reduction of the air pollution by CO2. © 2009 Universitatea Politehnica Bucuresti.