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.
Michard A.,Paris West University Nanterre La Défense |
Soulaimani A.,Cadi Ayyad University |
Hoepffner C.,Mohammed V University |
Ouanaimi H.,Cadi Ayyad University |
And 3 more authors.
Tectonophysics | Year: 2010
This work is based on the compilation and re-evaluation of the most significant data, either personal or from the literature, concerning the Moroccan Variscides. The latter constitute the only, moderately disturbed or even undisturbed part of the South-Western Branch of the Variscan Belt, facing directly NW Gondwana. They include two orogenic segments, namely the northern Mauritanides and the Meseta Domain exposed in the Saharan and Atlas-Meseta regions respectively, and a foreland belt cropping out essentially in the Anti-Atlas. The eastward thrust units of Saharan Morocco (Oulad Dlim) mostly originate from the West African Craton (WAC) border in an area of thin Palaeozoic sedimentation. Thin-skinned fold-thrust foreland arcs develop progressively northward (Zemmour) at the expense of the increasingly thick Palaeozoic series, whereas thick-skinned deformation characterizes the inverted proximal paleomargin in the Anti-Atlas Domain. As suggested by the Meseta and Anti-Atlas stratigraphic similarities, the Meseta Domain corresponds to a collage of moderately displaced, thinned crustal blocks from the distal Gondwana paleomargin. Variscan deformation is dominated by NW-verging thrusts, and metamorphism developed in the thickened tectonic prism in relation with crustal anatexis at depth. The Meseta-Anti-Atlas boundary is a major, ENE-trending transpressional dextral fault referred to as the South Meseta Fault (SMF). Discussing the correlations between the Variscan segments of Morocco and SW Iberia allows us to suggest that a latitudinal transform zone similar to the SMF separated these segments during the Late Palaeozoic. Subduction of the Rheic Ocean crust would have been directed SE-ward along both the Iberian and Moroccan Meseta, and NW-ward south of the SMF, i.e. along the WAC. © 2010 Elsevier B.V.
PubMed | Charles Sturt University, Australian Department of Primary Industries and Fisheries and Rabat Institute
Type: Journal Article | Journal: TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik | Year: 2016
This research provides the first report of a major locus controlling wheat resistance to Sunn pest. It developed and validated SNP markers that will be useful for marker-assisted selection. Sunn pest (Eurygaster integriceps Puton) is the most destructive insect pest of bread wheat and durum wheat in West and Central Asia and East Europe. Breeding for resistance at the vegetative stage of growth is vital in reducing the damage caused by overwintered adult populations that feed on shoot and leaves of seedlings, and in reducing the next generation of pest populations (nymphs and adults), which can cause damage to grain quality by feeding on spikes. In the present study, two doubled haploid (DH) populations involving resistant landraces from Afghanistan were genotyped with the 90k SNP iSelect assay and candidate gene-based KASP markers. The DH lines and parents were phenotyped for resistance to Sunn pest feeding, using artificial infestation cages at Terbol station, in Lebanon, over three years. Quantitative trait locus (QTL) analysis identified a single major locus on chromosome 4BS in the two populations, with the resistance allele derived from the landrace accessions, IG139431 and IG139883. The QTL explained a maximum of 42% of the phenotypic variation in the Cham6IG139431 and 56% in the Cham6IG139883 populations. SNP markers closest to the QTL showed high similarity to rice genes that putatively encode proteins for defense response to herbivory and wounding. The markers were validated in a large, unrelated population of parental wheat genotypes. All wheat lines carrying the C-G haplotype at the identified SNPs were resistant, suggesting that selection based on a haplotype of favourable alleles would be effective in predicting resistance status of unknown genotypes.
Khattabi A.,Madinate Al Irfane Rabat Institute |
Khattabi A.,Université 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.
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.
PubMed | Mohammed V University, Université Ibn Tofail, Rabat Institute and Abdelmalek Essaadi University
Type: Journal Article | Journal: Therapeutic advances in drug safety | Year: 2016
High concentrations of antituberculosis (anti-TB) drugs can be associated with many adverse drug reactions (ADRs). The objective of this study was to examine the plasma concentrations of rifampicin (RMP) and isoniazid (INH) in patients with and without ADRs.Concentration monitoring data of patients treated with anti-TB drugs were retrospectively analyzed from 2009 to 2011. RMP and INH plasma concentrations were measured 2 and 3 h after drug administration respectively using high-performance liquid chromatography.A total of 54 out of 120 patients have experienced ADRs to anti-TB drugs. The median concentrations [interquartile range (IQR)] obtained in patients with and without ADRs were 6.7 mg/l (3.7-9.9) and 5.6 mg/l (2.9-8.6) (High INH concentrations were common in patients with and without ADRs whereas RMP concentrations were low or within the normal range in most patients. Further studies are required to assess the association between high INH concentrations and the occurrence of ADRs.
Ahmed S.,Rabat Institute |
Abang M.M.,FAO Representation in Ethiopia |
Maalouf F.,International Center for Agricultural Research in the Dry Areas
Crop Protection | Year: 2016
Integrated disease management options (two sowing dates, three fungicides and 3-6 faba bean genotypes) in managing Ascochyta blight affecting faba bean were evaluated for three cropping seasons (2006/07-2008/09) in northern Syria for their effects on disease parameters, seed infection and dry seed yield. The combined results of the three seasons on disease parameters showed that sowing dates significantly affected final disease severity and area under the disease progress curve (AUDPC); faba bean genotypes significantly affected final disease severity, rate of disease development and AUDPC. The highest AUDPC (255% days) was observed in early than late planted (168% days) faba bean genotypes. The mean AUDPC of faba bean genotypes ranged from 189% days on genotype 1053-1325 to 234% days on ILB-1814. Only faba bean genotypes and fungicides showed significant interactions in affecting final disease severity and AUDPC. Fungicide sprays significantly affected mean percent pod infection and rate of disease development but not mean percent seed infection. Faba bean genotypes showed significant differences in dry seed yield and the yield ranged from 1.7 t ha-1 in cv. Ascot to 2.4 t ha-1 in faba bean genotype 945-105. Improved varieties with Ascochyta blight resistance are not currently released and available for farmers in northern Syria and the integration of early planting (November-December) with one foliar fungicide spray at vegetative stage can help to reduce Ascochyta blight severity, pod and seed infections. Chlorothalonil and azoxystrobin are widely used fungicides to manage Ascochyta blights on food legumes in many countries and one of them could be used depending on their availability and costs to managing faba bean Ascochyta blight in Syria and other Mediterranean type environments. © 2015 Elsevier Ltd.
Benzaggagh M.,Moulay Ismaï University |
Mokhtari A.,Moulay Ismaï University |
Rossi P.,Bureau de Recherches Géologiques et Minières |
Michard A.,Paris West University Nanterre La Défense |
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.
Biyi A.,Rabat Institute |
Oufroukhi Y.,Rabat Institute |
Doudouh A.,Rabat Institute
Chirurgie de la Main | Year: 2010
Hands and feet acrometastases are rarely observed. The authors report a case of bone metastasis to the left thumb and the right second metatarsal bone in a 37-year-old woman with breast carcinoma. Through this case report, mechanisms of such metastases are reviewed. © 2009 Elsevier Masson SAS. All rights reserved.
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.