Bouira, Algeria

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Ladjal Ettoumi Y.,University of Abderrahmane Mira de Béjaïa | Chibane M.,University of Bouira | Romero A.,University of Seville
LWT - Food Science and Technology | Year: 2016

This work is focused on emulsifying properties of pea, chickpea and lentil protein isolates at acidic conditions (pH 3), as affected by protein concentration and ionic strength. Emulsions characteristics and stability (droplet size distribution, flocculation, coalescence and creaming) were determined. The microstructure of selected emulsions was also studied. Results indicated that emulsifying properties (ability and stability) are dependent to protein concentration and highly sensitive to ionic strength. In our conditions, the best emulsifying properties are found around 1.5% of protein, and at less than 50 mM of NaCl. Clearly, ionic strength affects emulsions microstructure. Thus, this study indicated that pea, chickpea and lentil proteins would have great potential as emulsifiers in acidic food formulations. © 2015 Elsevier Ltd.

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.

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.

Lahiani N.,Blida University | Bennouar D.,University of Bouira
ACM International Conference Proceeding Series | Year: 2015

Platforms such as Moodle aims to ease and improve the teachinglearning process by means of taking advantage of internet technologies. All existing e-learning platforms are pretty similar the concepts of activity, assignment, deliverable or grade. But also a wide range of differences among them exists. Software Product Line (SPL) has as goal the effective production of similar software systems..Product derivation represents a fundamental aspect in SPL. It is also the main challenge that SPL faces. Despite its importance, there is only a little research on product derivation compared to the large work on developing product lines. In addition, the few available research reports guidance about how to derive a product from a product line. In this paper we describe a combination of SPL and MDA which both fit perfectly together in order to build applications in cost effective way. We proposed an approach for product derivation that adopts MDA with its organized layers of models to achieve SPL goals. © 2015 ACM.

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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