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Rabat, Morocco

Khattabi A.,Madinate Al Irfane Rabat Institute | Khattabi A.,Universite Ibn Tofail | Soulaymani-Bencheikh R.,Madinate Al Irfane Rabat Institute | Soulaymani-Bencheikh R.,Rabat Institute | And 4 more authors.
Transactions of the Royal Society of Tropical Medicine and Hygiene | Year: 2011

The objective of our consensus process was to develop a unique classification of the natural history of scorpion stings and their clinical signs and symptoms. The technique used was an adapted Delphi approach completed by a nominal group meeting. Researchers included in a study received a questionnaire in which we listed all terms used in published studies to characterize clinical consequences of scorpion stings and all signs and symptoms belonging to each class. For each term, experts had to judge the relevance for classifying clinical consequences of scorpion stings and state whether they agreed with the terminology; they could also propose new terms or classes. For each sign or symptom, they had to choose in which class it belonged and also propose if any other sign or symptom should be added. Sixteen researchers participated. Consensus was reached to include four classes: local manifestations; minor systemic manifestations; major systemic manifestations; lethal envenomation. Signs and symptoms associated with each class were defined. A second Delphi round is planned to define indicators to follow the epidemiological situation within and across countries and to develop recommendations for an optimal management of scorpion envenomations. These consensus-based tools should facilitate development of international clinical studies. © 2011 Royal Society of Tropical Medicine and Hygiene.

Hajlaoui A.,University of Sfax | Jarraya A.,University of Sfax | El Bikri K.,Rabat Institute | Dammak F.,University of Sfax
Composite Structures | Year: 2015

In this paper, the buckling behavior of functionally graded material (FGM) structures is investigated using the enhanced assumed strain (EAS) solid-shell element based on first-order shear deformation concept. Thus, a computational algorithm, for any type of laminates composites and/or FGM, is proposed for the shear correction factors estimation. Material properties are varied continuously in the thickness direction according to different distributions. This finite element is used to study the buckling behavior of FGM structures and to investigate the influence of same parameters on the buckling load. Comparisons of numerical results among existing ones show the performance of the developed elements. © 2015 Elsevier Ltd.

Benzaggagh M.,Moulay Ismai University | Mokhtari A.,Moulay Ismai University | Rossi P.,Bureau de Recherches Geologiques et Minieres | Michard A.,Paris West University Nanterre La Defense | And 4 more authors.
Journal of Geodynamics | Year: 2014

The aim of this paper is to describe the mafic rocks that crop out in the central-western Mesorif Zone (External Rif Belt), and discuss their geodynamic signification. Basalt flows, olistoliths and breccias occur in Oxfordian-Berriasian deposits of Mesorif units ascribed to the distal part of the African paleomargin. The climax of volcanic activity is observed at the northern border of a Kimmeridgian carbonate platform progressively dismembered during the Tithonian-Berriasian. In spite of the alteration of the basalts, their petrological and geochemical characters point to E-MORB affinities. The studied gabbro massifs (Bou Adel, Kef el Rhar west and north) occur as restricted slivers or klippes within the Senhadja nappe or mélange of the internal Mesorif, which overlies the basalt-bearing units and other, more external Mesorif units. The compositions range from troctolitic olivine gabbro to ferrogabbro with frequent ortho- to heteradcumulate textures; they display typical tholeiitic affinity. The gabbro massifs are crosscut by trondjhemite dykes and overlain by metabasalts, fault-scarp breccias, ophicalcites, marbles and radiolarites. Composition featuring initial near liquid composition, display multi elements patterns close to those of E-MORB, with a weak Eu negative anomaly and evidence of slight crustal contamination. These gabbro massifs were regarded as Jurassic-Cretaceous intrusions, locally dated (K-Ar) at 166. ± 3. Ma. Conversely, we assume they represent discrete samples of a Jurassic-Cretaceous oceanic basement (ophiolites), emplaced tectonically in the Senhadja nappe (mélange) of the central Mesorif. The correlation of both these types of mafic rock associations (paleomargin basalts and ophiolite klippes) with the serpentinites of the eastern Mesorif (Beni Malek) and Oran mountains (Algeria) is then briefly discussed. We conclude that the previous hypothesis of an intramargin "Mesorif suture zone" must be reconsidered, being challenged by that of a major, syn-collisional "Oran-Mesorif Strike-Slip Fault". In the latter hypothesis, the newly described Mesorif oceanic klippes would represent allochthonous remnants of the Ligurian-Maghrebian (Tethyan) oceanic domain. © 2013 Elsevier Ltd.

Oukerroum A.,CNRS Condensed Matter Physics Laboratory | Feddi E.,Rabat Institute | Bosch Bailach J.,University of Valencia | Martinez-Pastor J.,University of Valencia | And 2 more authors.
Journal of Physics Condensed Matter | Year: 2010

The effect of a lateral external electric field F on an exciton ground state in an InAs disc-shaped quantum dot has been studied using a variational method within the effective mass approximation. We consider that the radial dimension of the disc is very large compared to its height. This situation leads to separating the excitonie Hamiltonian into two independent parts: the lateral confinement which corresponds to a two-dimensional harmonic oscillator and an infinite square well in the growth direction. Our calculations show that the complete description of the lateral Stark shift requires both the linear and quadratic terms in F which explains that the exciton possess nonzero lateral dipolar moment and polarizability. The fit of the calculated Stark shift permits us to estimate the lateral permanent dipole moment and the polarizability according to the disc size. Our results are compared to those existing in the literature. In addition the behavior of the optical integral shows that the exciton lifetime is greater than that under zero field which is due to the field-induced polarization. © 2010 IOP Publishing Ltd.

Benkaddour A.,Rabat Institute | Benkaddour A.,Mohammed V University | Bahije L.,Mohammed V University | Bahoum A.,Mohammed V University | Zaoui F.,Mohammed V University
International Orthodontics | Year: 2014

The appearance of white spots on the vestibular surface of teeth fitted with brackets has been described as one of the potential iatrogenic effects of orthodontic treatment. These enamel demineralizations, more commonly known as "white spot lesions" (WSL), lead in some rare cases to the creation of true cavities, causing both esthetic and functional problems. The aim of our retrospective clinical study was to evaluate the incidence of the appearance of these WSL in a Moroccan orthodontic population and to determine possible associations with a number of risk factors. Patients and methods: The study was based on intraoral photographs of a pool of 69 patients who underwent orthodontic treatment with or without extractions in the DFO unit of the Rabat CCDT (Center for dental consultation and treatment). Patients with prostheses or WSL before the beginning of the study were excluded. Digital start- and end-of-treatment photos for each patient were compared by a single operator looking for the appearance of WSL on the vestibular surfaces of the incisors, canines, premolars and first molars. WSL were classed according to three degrees of severity: slight, severe and cavitation. Data were processed using SPSS 13.0 software. Results: The results of the study showed that the prevalence of WSL in the sample was 66.7%, with a highly significant predominance of localization in the premolar/molar segment and in patients with poor oral hygiene. Conclusion: Poor oral and dental hygiene was identified as the most important risk factor for the development of white spots during multibracket orthodontic treatment. © 2014 CEO.

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