Abdelmalek Essaâdi University is a public university in Tetuan, Morocco, with a branch in Tangier. The university includes the following faculties and schools.In Tetuan: Faculty of science National School of Applied science, Tetuan Campus Polydisciplinary FacultyIn Tangier: National School of Applied science, Tangier Campus Faculty of science and TechnologyThe National Schools and the faculty of science and technology deliver a state engineering degree . The other faculties deliver either a Bachelor or a Master degree. Wikipedia.
Rharrabe K.,Abdelmalek Essaadi University
Journal of insect science (Online) | Year: 2010
Using pure phytoecdysteroids isolated from Ajuga iva (L.) Schreber (Lamiales: Lamiaceae) and Silene nutans L. (Caryophyllales: Caryophyllaceae), plants known for their high ecdysteroid content, a study was carried out on the effects of ingestion of four different phytoecdysteroids (20-hydroxyecdysone, polypodine B, ponasterone A and makisterone A) on the growth and development of the Indian meal moth, Plodia interpunctella Hübner (Lepidoptera: Pyralidae) larvae when added at a concentration of 200 ppm in their diet. The experiments clearly showed the susceptibility of P. interpunctella to phytoecdysteroid ingestion. The toxicity of phytoecdysteroids manifested itself by a decrease in larval weight, induction of cannibalism and an increase of mortality, together with disruption of development. The severity of the phytoecdysteroid effect on P. interpunctella depended on the structure of the molecule. The results demonstrate that the minimal structural differences existing between these four phytoecdysteroids significantly affected their toxicity toward P. interpunctella. Makisterone A was the most toxic of the four compounds towards P. interpunctella larvae. In conclusion, phytoecdysteroids ingestion evokes disruptive growth effects on P. interpunctella. This work supports a role for phytoecdysteroids in plant defence against phytophagous insects.
El Fadar A.,Abdelmalek Essaadi University
Energy | Year: 2015
This paper presents a modeling and optimization investigation of a solar driven adsorption cooling system working with activated carbon-methanol pair. It deals with the effect of internal fins on the thermal behavior of the adsorber and on the system performance. A two-dimensional model describing the coupled heat and mass transfer in the adsorbent bed and energy balance in the main components of the solar collector is presented. Furthermore, a simulation code based on alternating direction implicit method is developed. This model has been validated by experimentation data. The analysis of the thermal behavior of adsorbent indicates that heat and mass transfer within the adsorbent is enhanced by increasing the number of fins. The simulation results show that, under the climatic, operating and design conditions of the system, the solar coefficient of performance is roughly invariant with changes in number of fins. The results indicate also that the thermal coefficient of performance is improved by increasing the number of fins. However, it is found that there is an optimal range of number of fins varying from 15 to 20 that allows obtaining an optimal performance; the corresponding range of fin spacing is found to be between 4 and 5.2cm. © 2015 Elsevier Ltd.
Azzouz A.,University of Jaen |
Souhail B.,Abdelmalek Essaadi University |
Ballesteros E.,University of Jaen
Journal of Chromatography A | Year: 2010
A semi-automatic flow-based method for the simultaneous determination of 9 pharmaceuticals and 3 hormones in water samples in a single analytical run is proposed. The analytes were retained on a solid-phase extraction sorbent column and 1 μL of the eluate analysed by gas chromatography in combination with electron impact ionization mass spectrometry in the SIM mode. The sorbent used, Oasis-HLB, pro-vided near-quantitative recovery of all analytes. The proposed method was validated with quite good analytical results including low limits of detection (0.01-0.06 ng L-1 for 100 mL of water) and good lin-earity (r2 >0.993) throughout the studied concentration ranges. The method provided good accuracy (recoveries of 85-103%) and precision (between-and within-day RSD values less than 7%) in the deter-mination of the pharmaceuticals and hormones in tap, river, pond, well, swimming pool and wastewater. © 2010 Elsevier B.V.
Jarroudi M.E.,Abdelmalek Essaadi University
Zeitschrift fur Angewandte Mathematik und Physik | Year: 2010
We study the homogenization of an incompressible viscous flow in a porous medium with double porosity. We derive a macroscopic model with local Navier-Stokes system in the large cavities, Darcy law in the thinner porous rock, and a contact law between the two. We use Γ-convergence methods associated with multi-scale convergence notions in order to get this limit law. We exhibit a critical ratio between the two scales of the pores. © 2010 Springer Basel AG.
Pinero Garcia F.,University of Granada |
Ferro Garcia M.A.,University of Granada |
Azahra M.,Abdelmalek Essaadi University
Atmospheric Environment | Year: 2012
This paper focuses on 7Be concentration in the atmospheric surface aerosols of the Spanish city of Granada, in the southern Iberian Peninsula. We analyze the effects of meteorological conditions in the geographical zone over the period 2005-2009. A prediction model is suggested to describe the behaviour of atmospheric aerosols containing 7Be. The model was applied from January to May 2010 and shows that temperature, relative humidity and precipitation are the meteorological factors responsible for the behaviour of atmospheric aerosols. The statistical significance of the results was 99%. This study helps understanding of the atmosphere of Granada as well as the climate variables responsible for transportation and deposition of atmospheric aerosols. Moreover, in case of a massive release of radionuclides into the atmosphere, the results of this study will help predict behaviour in this city and other continental areas with a similar climate. © 2011 Elsevier Ltd.