Bouira, Algeria

University of Bouira
Bouira, Algeria
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Bennouar D.,University of Bouira | Bennouar D.,LIMPAF laboratory Software System and Sensor Networks for Agriculture and Forestry
International Arab Journal of Information Technology | Year: 2017

Assessment is a key component of the teaching and learning process. In most Algerian Universities, assessing a student’s answer to an open ended question, even if it is a short answer question, is a difficult and time-consuming activity. In order to enhance the learning process quality and the global student evaluation process and to highly reduce the assessment time and difficulties, most Algerian Universities were provided with an e-learning environment as a result of a government initiative. Unfortunately, such environment seems to be rarely used in the student’s assessment process mainly due to the inefficiency of its Automatic Grading Subsystem (AGS) and the underlying corpora. A corpora used in the grading process contains a great number of miscellaneous answers, each one graded by more than two experts. Building efficient corpora for a course is actually a challenge. The underlying subjectivity in grading answers may have a serious impact in the corpus quality. The specific course context defined by a teacher and the time dependent grading strategy may make very difficult the construction of traditional course corpora. This paper presents a short answer AGS which has the capacity to dynamically build an up to date corpus related to each correct reference short answer. The automatically generated corpus is mainly based on a variety of indications specified by the teacher for each reference short answer. The early experiment of the presented AGS has shown its high efficiency for the automatic answers grading in some computer science courses. © 2017, Zarka Private University. All rights reserved.

Mahfoud B.,University of Bouira | Bendjaghlouli A.,University of Science and Technology Houari Boumediene
Advanced Materials - TechConnect Briefs 2016 | Year: 2016

Natural convection is simulated in a truncated cone filled with nanofluid. Inclined and top walls have constant temperature where the heat source is located on the bottom wall of the conical container which is thermally insulated. A finite volume approach is used to solve the governing equations using the SIMPLER algorithm for different parameters such as Rayleigh number, inclination angle of inclined walls of the enclosure and heat source length. The results showed an enhancement in cooling system by using a nanofluid, when conduction regime is assisted. The inclination angle of inclined sidewall and heat source length affect the heat transfer rate and the maximum temperature.

Taibi-Benziada L.,University of Science and Technology Houari Boumediene | Sedkaoui Y.,University of Bouira
Spectroscopy Letters | Year: 2013

Calcium, strontium, and barium titanates were previously synthesized then mixed and wet-ground with 5 mol.% of lithium and calcium fluorides. These mixtures were pressed into pellets and air-fired. The ceramics were investigated by X-ray diffraction, scanning electron microscopy, and dielectric measurements. Each sample is a perovskite single phase. The oxyfluoride deriving from calcium titanate exhibits a phase transition around 283 K. For strontium titanate, no phase transition is detected. On the other hand, the ceramic related to barium titanate displays a ferroelectric phase transition around 300 K and a dielectric relaxation at about 10 MHz. These oxyfluorides could be of interest for capacitor manufacturing. © 2013 Copyright Taylor and Francis Group, LLC.

Rezki M.,University of Bouira | Griche I.,University of Bouira
2017 8th International Renewable Energy Congress, IREC 2017 | Year: 2017

This paper aims to investigate problem of the integration of a photovoltaic site been submitted under local weather conditions, located at Bouira city (Algeria) in a three-phase grid. In fact, Algeria has great assets to embark on the exploration of photovoltaic energy whether by its solar potential or by its large area. The study of photovoltaic systems with their integration into conventional electrical networks is still useful, which gives importance to this research. For this the photovoltaic system with MPPT control was simulated, the selected MPPT algorithm is based on the principle of disturb end observe (P&O). This is followed by a simulation of our photovoltaic system connected to a three-phase network. © 2017 IEEE.

Mahfoud B.,University of Bouira | Bessaih R.,University of Mentouri Constantine
International Journal of Heat and Mass Transfer | Year: 2016

Three-dimensional steady combined free and forced convective magnetohydrodynamic (MHD) flow are simulated in a cylindrical cavity filled with a liquid metal and submitted to a vertical temperature gradient and an axial magnetic field. The forcing corresponds to a swirling flow produced by counter-rotation of the top and bottom disks. The governing Navier-Stokes, energy, and potential equations along with appropriate boundary conditions are solved by using the finite-volume method. Comparisons with previous results were performed and found to be in excellent agreement. The effects of magnetic field on flow and temperature fields are analysed. When the Reynolds number is increased, the axisymmetric basic state loses stability and different complex flow appear. Axisymmetric (m = 0) and asymmetric m = 1 and m = 2 azimuthal modes are observed. Azimuthal mode m = 3 are found when the Hartmann number, Ha is sufficiently large. In the mixed convection case the m = 1 becomes the dominant mode in place of m = 0. The stability diagram (Recr-Ha) corresponding to the transition from axisymmetric to non-axisymmetric flow by increasing values of the Richardson number is obtained. © 2015 Elsevier Ltd.

Belkhiri L.,University of Batna | Mouni L.,University of Bouira | Boudoukha A.,University of Batna
Journal of African Earth Sciences | Year: 2012

Hydrochemical, multivariate statistical and inverse hydrogeochemical modeling techniques were used to determine the main factors and mechanisms controlling the chemistry of groundwaters in the El Eulma Mio-Plio-Quaternary aquifer, East Algeria. Cluster analysis based on major ion contents defined three main chemical water types, reflecting different hydrochemical processes. The first, group 1, has low salinity (mean EC=937μS/cm) and abundance orders Ca 2+>Na +≈Mg 2+>K + and HCO3+>Cl->SO42->NO3-. With increased water-rock interaction, waters in groups 2 and 3 become more saline, changing composition towards Cl-HCO 3-Ca and Cl-Ca-Na types. The PHREEQC geochemical modeling demonstrated that relatively few phases are required to derive water chemistry in the area. In a broad sense, the reactions responsible for the hydrochemical evolution in the area fall into three categories: (1) dissolution of evaporite minerals; (2) precipitation of carbonate minerals, quartz, kaolinite and Ca-smectite; (3) ion exchange. © 2012.

Bouamra Y.,University of Bouira
Procedia Engineering | Year: 2015

In order to provide higher mechanical effectiveness of confined concrete beam, the new technique proposed in this work consists to design at the ends of the steel reinforcements two opposing half cylindrical plates, creating an induced compression applied in the tended zone of the concrete beam element, when the steel reinforcement is subjected to tensile forces developed by the bending load. This technique ensures the concrete rigidity within the structure, avoids the problem of cracking and ruptures of the element and allows the transformation of the tensile force of the steel reinforcements into compressive force of the tended concrete inside the two half cylindrical plates. The confinement is induced by the displacement of the tended steel reinforcement, on all the transverse surface of the half-cylinder plates. This design avoids the penetration of the steel reinforcement in the concrete which generates a shear force of the section. Thus, the concrete of tended zone of the beam finds in position to take part in the resumption of the flexural efforts. The nonlinear finite element modeling shows that the proposed technique of confinement increases the strength and ductility of reinforced concrete beam. The numerical modelling analysis is completed by preliminary experimental work in order to allow for a better understanding of the behavior of this new confinement proposed technology. © 2015 The Authors. Published by Elsevier Ltd.

Belkhiri L.,University of Batna | Mouni L.,University of Bouira
Natural Resources Research | Year: 2014

Multivariate statistical methods and geochemical modeling were used to assess spatial variation of water quality of the Soummam basin, Algeria. The application of hierarchical cluster analysis (HCA) showed three main groups of samples. Group 1 samples are exclusively composed of surface water. Groups 2 and 3 samples consist of groundwater. Discriminant analysis assigned about 98.6% of the cases grouped by HCA. All groups are super-saturated with Ca-montmorillonite, dolomite, gibbsite, K-mica, kaolinite, and quartz, and all these groups are under-saturated with albite, anhydrite, anorthite, CO2(g), gypsum, halite, melanterite, and smithsonite. The results of analysis of variance indicate that the saturation indices of each of the mineral phases are significant except for chalcedony and quartz (p > 0.05). The results obtained by inverse geochemical modeling show the dissolution of albite, which justifies Na enrichment during the chemical evolution of groundwater. Calcite, dolomite, Ca-montmorillonite, kaolinite, illite, gibbsite, and K-mica are shown to have always precipitated. © 2014, International Association for Mathematical Geosciences.

Siguerdjidjene H.,University of Bouira
Advanced Structured Materials | Year: 2015

The current rail transport in Algeria does not meet the needs of the national economy because some of the lines have been designed and built according to a set of old standards, which results in them being characterized by a relatively low productivity and lack of work efficiency. This is why the reconstruction and strengthening of the Algerian railway network is becoming necessary if not mandatory. The further development of the railway linking and improving the quality of its operation will result in improved performance and speed. This is why the development of the Algerian rail network is a very important and specific task addressing this issue must ensure a high competitiveness. The development of an approach in order to increase the railway lines efficiency in the Algerian context and the process of reconstructing them needs a thorough analysis the state of a number of railway lines with low profitability, in order to organize their reconstruction, open the possibility of having easier access and efficient facilities, thus reaching a rational scheme. © Springer International Publishing Switzerland 2015.

Belkhiri L.,University of Batna | Mouni L.,University of Bouira
Desalination and Water Treatment | Year: 2013

Multivariate statistical and geochemical modeling techniques were used to determine the main factors and mechanisms controlling the chemistry of groundwaters in the El Eulma area. Three major water groups resulted from the Q-mode cluster analysis. The samples from the area were classified as low salinity (Group 1), moderate salinity (Group 2), and high salinity waters (Group 3). Inverse geochemical models of the statistical groups were developed using PHREEQC to elucidate the chemical reactions controlling water chemistry. In a broad sense, the reactions responsible for the hydrochemical evolution in the area fall into three categories: (1) dissolution of evaporite minerals; (2) precipitation of carbonate minerals, quartz, kaolinite, and Ca-smectite; and (3) ion exchange. © 2013 Desalination Publications.

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