University Med dal

Rabat, Morocco

University Med dal

Rabat, Morocco
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Elhamdouni Y.,University Med dal | Khabbazi A.,University Med dal | Benayad C.,University Med dal | Mounir S.,University Med dal | Dadi A.,Institute University des science et Techniques
IOP Conference Series: Materials Science and Engineering | Year: 2017

This work is part of the valuation of local materials such as clay (earth), alfa fiber and straw fiber. The goal is to use these materials as bricks in rural construction. These materials are abundant, natural, and renewable. The objective of this work is to study the thermal and mechanical behavior of a new material by mixing clay (chosen as the binder) with different mass percentages of alfa fiber (0.5%, 1%, 2%, 3%, 4%), and to compare these results with those of materials often used in the construction of individual houses in rural Morocco (clay + straw). The results obtained prove to us that using straw fibers can reduce the thermal conductivity compared to alfa fiber, which allows to have energy savings of 2% to 7%. By against, alfa fibers can improve the mechanical behavior of clay-based materials when compared to the clay + straw material (an increase of 8% to 17% in the tractive resistance by bending and 6% to 18% for compression resistance). These results also specify the optimal usage conditions of these fibers (alfa and straw) in the clay bricks. © Published under licence by IOP Publishing Ltd.

Idchabani R.,University Med dal | Elganaoui M.,University of Lorraine | Garoum M.,University Med dal
Physical and Chemical News | Year: 2014

The building thermal behavior analysis constitutes the basis for improving energy efficiency. This work evaluates the thermal performance and the environmental impact of residential buildings’ heating in Morocco based on the climatic conditions of the Mediterranean coast. The present analysis applies the degree-days method taking into account the variability of the balance temperature of the building. The study concludes that the heating thermal requirements for the prototype building vary between 43 and 144KWh/m².year depending on its configuration. The heating needs increase with the glazing rate in the case of single glazing faster than in the double glazing. These needs also change proportionally to the rate of air exchange and decrease significantly with increasing casual heat gains. The liquefied petroleum gas (LPG) and electricity were chosen as sources of energy. The electricity consumption is 2.6 times greater than that of LPG in term of kg oil equivalent. Therefore, by using LPG the emissions of greenhouse gases can be divided by 3.4 compared to electricity. ©(2014), E-flow PDF Best Edition. All rights reserved.

Yadini A.E.,University Med dal | Marouane B.,University Med dal | Ahmido A.,University Med dal | Dunlop P.,University of Ulster | And 3 more authors.
Journal of Materials and Environmental Science | Year: 2013

Kinetics degradation of fenamiphos, an insecticide from organophosphorus class of pesticides, has been investigated in aqueous solution using UV light in absence and in presence of slurry titanium dioxide (TiO2) or supported on borosilicate glass plates. Kinetic parameters were experimentally determined and an apparent first order kinetic was observed. For photolysis process of fenamiphos, two photoproducts were identified and characterized using High Performance Liquid Chromatography/mass spectrometry (HPLC/MS). The plausible mechanism of photolysis involved is oxidation of sulphonamide group. In presence of photocatalyst, Degussa P25 shows a good photocatalytic activity and a complete degradation was observed after 180 min.

Orhanou G.,University Med dal | Hajji S.E.,University Med dal
Journal of Theoretical and Applied Information Technology | Year: 2010

The Universal Mobile Telecommunications System (UMTS) offers panoply of 3G services that require a high protection of the transmitted information. In the present paper, we are interested by network access security, especially the protection of the data integrity and the provisioning of data encryption. A special interest will be given to the second set of 3GPP cryptographic algorithms UEA2/UIA2 based on the SNOW 3G algorithm. This set was, in fact, a subject only of few research works in comparison with the first one based on KASUMI algorithm. A closer look is taken at both the encryption algorithm UEA2 and the integrity algorithm UIA2 operations. The different operation modes of the algorithm SNOW 3G will be presented as well. A study of the time and space complexity of three algorithms has been carried out. © 2005 - 2010 JATIT. All rights reserved.

Orhanou G.,University Med dal | Hajji S.E.,University Med dal | Laassiri J.,University Med dal | Bentaleb Y.,University Med dal
Journal of Theoretical and Applied Information Technology | Year: 2010

In the present paper, we are interested in Universal Mobile Telecommunications System (UMTS) Access Network security. A special interest is given to the protection of the data integrity and the provisioning of data encryption. Indeed, the appropriate procedures and cryptographic algorithms are discussed. In previous work, we were interested in the study of the operation and complexity of the algorithms, but actually we will focus on other aspects. A closer look is taken at the two sets of UMTS cryptographic algorithms: UEA1/UIA1 (UEA indicates UMTS Encryption Algorithm and UIA UMTS Integrity Algorithm) based on the KASUMI algorithm and UEA2/UIA2 based on the SNOW 3G algorithm. Furthermore, this paper includes the results of the verification and the implementation of the two sets of the UMTS cryptographic algorithms. The necessary corrections and/or adaptation of the 3GPP algorithms codes having carried out to meet the 3GPP algorithms specifications. Furthermore, we propose an adaptation of the second set of algorithms to the little-endian machines since the 3GPP proposed codes are only limited to the big-endian machines. These corrections and adaptations are presented in the present paper and some implementation examples are presented as well. © 2005 - 2010 JATIT & LLS. All rights reserved.

Kabidi K.,University Med dal | Bargach M.N.,University Med dal | Tadili R.,University Med dal
Physical and Chemical News | Year: 2013

Since measurements of global and diffuse irradiances impinging on a sloped surface for most parts of Morocco are not available, the correlation relations and models used until now for estimating these values for the Moroccan stations were developed by Nfaoui and Ben Kaddour. In this paper, we develop the correlation existing between the clearness index Kt or the nebulosity Kd, and the monthly average daily sunshine fractionσ. Thirty years of sunshine duration measured data related to 28 Stations over Morocco, have been used to develop models estimating monthly mean values of radiation components. Models are obtained using the least square method, and given the highest correlation coefficients and the lowest standard errors, they are next tested and compared to the models Nfaoui and Ben Kaddour Using FORTRAN language, GRADS software and Geographical Information System (GIS), monthly maps of solar irradiation impinging on a tilted surface are plotted for the whole country. The values of monthly average radiation on titled surface range between 2.7 kWh.m-2 (in December) in Tangier (Lat: 34°43'N, Long: 05°45'W) and 7.7 kWh.m-2 (in June) in Ouarzazate (Lat: 30°56' N, Long: 06°54'W).

Khabbazi A.,University Med dal | Cherki A.,University Med dal | Idchabani R.,University Med dal | Garoum M.,University Med dal
Physical and Chemical News | Year: 2013

Cork, natural and renewable material, has thermal and acoustic properties very interesting because of the elasticity of its constituent cells and the air entrapped representing a large part of its apparent volume. In the present work we investigated the thermal behavior of a class of granular cork bound with two different binders: cement mortar and plaster.

Labjar N.,University Med dal | Labjar N.,CNRS Materials and Transformations Unit of UMET | Hajjaji S.E.,University Med dal | Lebrini M.,University of Lille Nord de France | And 5 more authors.
Journal of Materials and Environmental Science | Year: 2011

In this work, the surface morphology and chemical analysis of carbon steel substrates after weight loss measurements in 1 M HCl media in the absence and the presence of aminotris-(methylenephosphonic) acid (ATMP) were studied using a scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). X-ray photoelectron spectroscopy was coupled to these characterizations to qualify corrosion layers and morphologies. The solution of immersion was analyzed by inductively coupled plasma. Results indicate that the addition of ATMP reduces the rate of metal attack. EDX, SEM and X-ray photoelectron spectroscopy observations of the electrode surface confirmed existence of a protective adsorbed film of the inhibitor on the electrode surface.

Elhamdouni Y.,University Med dal | Khabbazi A.,University Med dal | Benayad C.,University Med dal | Dadi A.,Institute University des science et Techniques | Ahmid O.I.,University Of aud
Energy Procedia | Year: 2015

This work is part of the development of local materials such as clay and fiber alfa in the north of Morocco. These materials are abounding, natural and renewable, they have thermal properties very interesting. Our objective is to study the fiber alfa effect on the thermal characteristics of clay based materials. For this reason we mix the clay (chosen as base material) with different percentages of fibers alfa (0.5%, 1%, 2%, 3%, 4%).Then we compare the properties thermo physical of this new material with those of clay only, to motivate the proposal to use this material as insulation in rural construction. This comparison of the energy performance of these two materials will enable us to deduce that the new material is less effusif than clay alone, its lightness exceeds that of clay only, and its use as brick walls should give an energy saving over 30%. © 2015 The Authors. Published by Elsevier Ltd.

Elbenani B.,University Med dal | Ferland J.A.,University of Montréal
International Journal of Production Research | Year: 2012

The cell formation problem is extensively studied in the literature, but very few authors have proposed exact methods. In this paper a linear binary programming formulation is introduced to generate a solution for the cell formation problem. To verify the behaviour of the proposed model, a set of 35 benchmark problems is solved using the branch and cut method implemented in the IBM ILOG CPLEX 10.11 Optimiser. Moreover, these results allow us to validate the quality of the solution generated with heuristic methods proposed in the literature. This experimentation indicates that, for the smaller problems, the best-known solutions are the same as those generated with CPLEX 10.11 Optimiser. These results indicate a fair confidence in the optimality of the best-known solutions generated by the heuristic methods. Furthermore, our approach is the first exact method providing results of this quality. © 2012 Copyright Taylor and Francis Group, LLC.

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