University IbnZohr

Agadir, Morocco

University IbnZohr

Agadir, Morocco
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Baraka N.E.,University IbnZohr | Saffaj N.,University IbnZohr | Mamouni R.,University IbnZohr | Laknifli A.,University IbnZohr | And 3 more authors.
Desalination and Water Treatment | Year: 2014

The present paper is devoted to synthesis of porous ceramic support from local Moroccan clay (region of Agadir). This material has been dictated by their natural abundance (low price) and their beneficial properties. In this work, we were also interested in the development and the characterization of new mineral support for microfiltration and ultrafiltration membrane. The support, with flat configuration, was prepared from natural clay: the powder was crushed, sieved to 125 μm and mixed with organic additives and water. The obtained paste was then extruded to elaborate a porous structure. The firing temperature of the support is 800°C. After firing, the elaborated support showed an average pore diameter of 11 μm and a porosity of 41%. The average support permeability determined using pure distilled water is 1,805 L/h m2 bar. This porous ceramic tube was used as support to prepare microfiltration membrane which were tested for the filtration. © 2013 © 2013 Balaban Desalination Publications. All rights reserved.

Lgaz H.,IbnTofail University | Lgaz H.,University IbnZohr | ELaoufir Y.,IbnTofail University | ELaoufir Y.,Mohammed V University | And 9 more authors.
Der Pharma Chemica | Year: 2015

The effects of (E)-3-(4-methoxystyryl)quinoxalin-2(1H)-one (Q1) and its synergistic effect with KI on the corrosion of carbon steel in 1.0 M HCl solution were studied using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization measurements. The inhibition efficiency increases with the concentration of the inhibitor and increased further with the presence of 1.0 mM KI. The synergistic effect of 1.0 mM KI at different concentrations of Q1 was determined by calculating the synergism parameters. EIS plot indicates that the addition of inhibitor increases the charge-transfer resistance (Rct) and decreases the double-layer capacitance (Cdl) of the corrosion process. The adsorption of Q1 and KI on the metal surface in 1.0 M HCl solution obeys the Langmuir adsorption isotherm.

Farhat S.,Advanced Technologies and Engineering of Renewable Energies ERTAIER | Alaoui R.,Advanced Technologies and Engineering of Renewable Energies ERTAIER | Kahaji A.,Advanced Technologies and Engineering of Renewable Energies ERTAIER | Bouhouch L.,Advanced Technologies and Engineering of Renewable Energies ERTAIER | Ihlal A.,University IbnZohr
International Review of Electrical Engineering | Year: 2015

The maximum power point (MPP) of a photovoltaic (PV) system varies with temperature and solar irradiation. The implementation a technical control of the PV power converter systems to search and make this systems to operate at maximum output power is required. The realization of the aforementioned converter and digital implementation of this particular control are presented with experimental results. Hill climbing techniques, which allows tracking the MPP in real time, is implemented. This technique involves in the implementation and comparison of the efficiency of both methods: "Perturb and Observe" (P&O) and the Incremental Conductance (InC). The proposed techniques are validated using the experimental data of 40Wp PV panel (PVP), controlled by a boost converter. Following the comparison of both chosen techniques, output power efficiency and dynamic response are discussed. We also present the advantages and drawbacks of two techniques by using the performed measurements results. © 2015, Praise Worthy Prize S.r.l. - All rights reserved.

Boujlaleb L.,University IbnZohr | Idarrou A.,University IbnZohr | Mammass D.,University IbnZohr | Sarr I.,Cheikh Anta Diop University
Proceedings of 2015 IEEE World Conference on Complex Systems, WCCS 2015 | Year: 2015

The proliferation and widespread of social web provide rich data about peoples' activities. For instance, geographical position and timestamps of each event can be obtained thanks to mobile devices and location-based services. Basically it sounds well that people, who used to be frequently at the same place and the same time period, are very likely to be socially related. Therefore, it is worth-noting that tracking user's position over time may help discovering interesting patterns, which can be used to enhance community structure. The goal of this paper is to track and collect users' spatiotemporal activities events in order to unveil homogeneous groups that could not appear in a unique social network. In this respect, we propose a community detection approach from spatiotemporal aspects. First, we use ST-DBSCAN clustering algorithm to identify clusters corresponding to temporary communities that we called perspective. Then, we apply different random graph models to establish relationships between pairs of individuals. This real-Time detecting algorithm is done to track the dynamic evolution of communities within a sequence of time windows. Finally, we test our proposed method on a real-life datasets in order to analyze the soundness and feasibility of this technique. © 2015 IEEE.

Azza H.,University IbnZohr | Selhaoui N.,University IbnZohr | Kardellass S.,University IbnZohr | Iddaoudi A.,University IbnZohr | Bouirden L.,University IbnZohr
Journal of Materials and Environmental Science | Year: 2015

The thermodynamic optimization of the AL-Li binary system was carried out with the help of CALculation of PHAse Diagram (CALPHAD) method. Al2Li3, Al4Li5 and AlLi2 have been treated as stoichiometric compounds while a solution model has been used for the description of the liquid, FCC_A1 (Al) and BCC_A2 (Li) phases. The non-stoichiometric AlLi phase with a narrow homogeneity range was modeled using a two-sublattice model with a mutual substitution of Al and Li on both Sublattice. The optimization is carried out in the Thermo-calc package. A set of self-consistent thermodynamic parameters are obtained. The calculated phase diagram and thermodynamic properties agree well with the available experimental data.

Kardellass S.,University IbnZohr | Selhaoui N.,University IbnZohr | Iddaoudi A.,University IbnZohr | Ait Amar M.,University IbnZohr | And 2 more authors.
MATEC Web of Conferences | Year: 2013

The Pd-Y system was critically assessed using the CALPHAD technique. The solution phases (liquid, b.c.c., f.c.c. and h.c.p.) were modeled using the Redlich-Kister equation. The intermetallic compounds Pd3Y and PdY, which have homogeneity ranges, were treated as the formula (Pd,Y) 0.75(Pd,Y)0.25 and (Pd,Y)0.5(Pd,Y) 0.5 by a two-sublattice model with a mutual substitution of Pd and Y on both sublattices. The optimization was carried out in two steps. In the first treatment, Pd3Y and PdY are assumed to be stoichiometric compounds; in the second treatment they are treated by a sublattice model. The parameters obtained from the first treatment were used as starting values for the second treatment. The calculated phase diagram and the thermodynamic properties of the system are in satisfactory agreement with the experimental data. © Owned by the authors, published by EDP Sciences, 2013.

PubMed | Tunis el Manar University, University IBNZOHR, University Pompeu Fabra, Lebanese American University and 2 more.
Type: | Journal: Molecular biology and evolution | Year: 2016

North Africa is characterized by its diverse cultural and linguistic groups and its genetic heterogeneity. Genomic data has shown an amalgam of components mixed since pre-Holocean times. Though no differences have been found in uniparental and classical markers between Berbers and Arabs, the two main ethnic groups in the region, the scanty genomic data available have highlighted the singularity of Berbers. We characterize the genetic heterogeneity of North African groups, focusing on the putative differences of Berbers and Arabs, and estimate migration dates. We analyze genome-wide autosomal data in five Berber and six Arab groups, and compare them to Middle Easterns, sub-Saharans, and Europeans. Haplotype-based methods show a lack of correlation between geographical and genetic populations, and a high degree of genetic heterogeneity, without strong differences between Berbers and Arabs. Berbers enclose genetically diverse groups, from isolated endogamous groups with high autochthonous component frequencies, large homozygosity runs and low effective population sizes, to admixed groups with high frequencies of sub-Saharan and Middle Eastern components. Admixture time estimates show a complex pattern of recent historical migrations, with a peak around the 7th century C.E. coincident with the Arabization of the region; sub-Saharan migrations from in the 1

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