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Fes, Morocco

Sidi Mohamed Ben Abdellah University is a university in Fez city, Morocco, which was founded in 1975. It is named for Mohammed ben Abdallah. Wikipedia.

Mellit A.,University Sidi Mohammed Ben Abdellah | Pavan A.M.,University of Trieste
Solar Energy | Year: 2010

Forecasting of solar irradiance is in general significant for planning the operations of power plants which convert renewable energies into electricity. In particular, the possibility to predict the solar irradiance (up to 24 h or even more) can became - with reference to the Grid Connected Photovoltaic Plants (GCPV) - fundamental in making power dispatching plans and - with reference to stand alone and hybrid systems - also a useful reference for improving the control algorithms of charge controllers. In this paper, a practical method for solar irradiance forecast using artificial neural network (ANN) is presented. The proposed Multilayer Perceptron MLP-model makes it possible to forecast the solar irradiance on a base of 24 h using the present values of the mean daily solar irradiance and air temperature. An experimental database of solar irradiance and air temperature data (from July 1st 2008 to May 23rd 2009 and from November 23rd 2009 to January 24th 2010) has been used. The database has been collected in Trieste (latitude 45°40′N, longitude 13°46′E), Italy. In order to check the generalization capability of the MLP-forecaster, a K-fold cross-validation was carried out. The results indicate that the proposed model performs well, while the correlation coefficient is in the range 98-99% for sunny days and 94-96% for cloudy days. As an application, the comparison between the forecasted one and the energy produced by the GCPV plant installed on the rooftop of the municipality of Trieste shows the goodness of the proposed model. © 2010 Elsevier Ltd. All rights reserved. Source

Ouzahra M.,University Sidi Mohammed Ben Abdellah
Automatica | Year: 2012

This paper considers feedback stabilization of distributed semilinear systems using switching controls. The semilinear processes, together with the switched controllers, constitute a type of switched nonlinear system. Three kinds of stabilizabilities, namely weak, strong and exponential stabilizabilities, are investigated one by one. Sets of sufficient conditions are obtained for each case. A necessary condition for strong stabilizability is given. The stabilizing control is characterized using a minimization problem. Applications to parabolic and hyperbolic like equations are considered. © 2012 Elsevier Ltd. All rights reserved. Source

Masrour R.,University Sidi Mohammed Ben Abdellah
Journal of Alloys and Compounds | Year: 2010

The magnetic properties of the spinels systems Zn1-xCdxCr2Se4 and Hg1-xCdxCr2S4 have been studied by mean-field theory and high-temperature series expansions in the range 0 ≤ x ≤ 1. The nearest neighbour and the next-nearest-neighbour super-exchange interaction J1(x) and J2(x) respectively, are calculated for the two systems, using the first theory in the range 0 ≤ x ≤ 1. The intra-planar and the inter-planar interactions are deduced. The corresponding classical exchange energy for the magnetic structures is obtained. The second theory has been applied to the spinel systems Zn1-xCdxCr2Se4 and Hg1-xCdxCr2S4, combined with the Padé approximants method, to determine the magnetic phase diagrams (TC versus dilution x) in the range 0 ≤ x ≤ 1. The obtained theoretical results are in agreement with the experimental ones obtained by magnetic measurements. The critical exponents associated with the magnetic susceptibility (γ) and with the correlation lengths (v) are deduced for the two systems in the ordered phase. © 2009 Elsevier B.V. All rights reserved. Source

Tachfouti N.,University Sidi Mohammed Ben Abdellah
The Pan African medical journal | Year: 2013

Studies have shown an association between smoking and tuberculosis (TB) infection, disease and TB-related mortality. We thus documented the impact of smoking and others factors on TB treatment default. A cohort of 1039 new TB cases matched on smoking status was followed between 2004 and 2009 in eight Moroccan regions. Treatment default was defined according to international criteria. Univariate analyses were used to assess associations of treatment default with smoking status and demographic characteristics. Multivariate logistic regression was used to adjust for potential confounding. Patients' mean age was 35.0 ±13.2 years. The rate of treatment default was 30.2%. Default was significantly higher among men, smokers, persons living in urban areas and non-religious Muslims. After adjusting for confounding variables, factors that remained significantly associated with treatment default were: being male (OR = 3.2; 95% CI: 1.2-8.7), being a non-religious Muslim (OR = 2.0; 95% CI: 1.4-2.9) and living in an urban area OR = 3.0; 95% CI: 1.8-4.9). The high rate found for default suggests important program's inadequacies and an urgent need for change. Therefore continued research of predictors of default and strategies to reinforce adherence is recommended. Source

El-Mahdi O.,University Sidi Mohammed Ben Abdellah | Melnyk O.,University of Lille Nord de France
Bioconjugate Chemistry | Year: 2013

Since the 1990s, α-oxo aldehyde or glyoxylic acid chemistry has inspired a vast array of synthetic tools for tailoring peptide or protein structures, for developing peptides endowed with novel physicochemical properties or biological functions, for assembling a large diversity of bioconjugates or hybrid materials, or for designing peptide-based micro or nanosystems. This past decade, important developments have enriched the α-oxo aldehyde synthetic tool box in peptide bioconjugation chemistry and explored novel applications. The aim of this review is to give a large overview of this creative field. © 2013 American Chemical Society. Source

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