16 research outputs found

    Utilisation d'un SIG pour la prévention et la lutte active. Assistance à la décision pour l'organisation et la gestion des ressources en eau.

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    Inventaire exhaustif des ressources hydrauliques utilisables dans la DFCI

    Des Nord(s) Vers les Sud(s), Un autre regard sur les mobilités contemporaines

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    International audienceLes recherches sur les migrations offrent dĂ©sormais un panorama dĂ©taillĂ© de la diversitĂ© des expĂ©riences de dĂ©placement. Les flux des pays du Nord vers ceux du Sud occupent toutefois une place relativement nĂ©gligeable dans ce tableau d’ensemble. Ils peinent Ă  constituer un objet de recherche unifiĂ© alors mĂȘme qu’ils prennent de plus en plus d’ampleur.S’appuyant sur des travaux empiriques, cet ouvrage invite le lecteur Ă  observer sans a priori des modes de vie et des modes d’engagement trop souvent rĂ©duits Ă  l’expatriation, au privilĂšge, au tourisme ou encore au retour. Son parti pris est de faire des figures, des pratiques et des modes d’installation des individus qui empruntent le chemin des Nords vers les Suds un objet de recherche lĂ©gitime au sein de la socio-anthropologie des migrations.S’intĂ©ressant aussi bien aux projets individuels qu’aux logiques structurelles qui les accompagnent, et parfois les contraignent, ce livre ouvre un chantier de recherche ambitieux et jusqu’à prĂ©sent inĂ©dit. Les auteurs rĂ©unis ici explorent un ensemble de trajectoires et de phĂ©nomĂšnes sociaux dont les dynamiques multiples participent Ă  redĂ©finir les relations entre sociĂ©tĂ©s nationales. Ils nous invitent ainsi plus largement Ă  interroger nos reprĂ©sentations du Nord et du Sud

    Development of micromorph tandem soalr cells on flexible low cost plastic substrates

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    We report on the development of fully flexible microcrystalline and micromorph tandem solar cells directly on low-cost substrates like poly-ethylen-terephtalate (PET) and poly-ethylen-naphtalate (PEN). The cells are deposited in nip or nip/nip configuration on the plastic substrate coated with a highly reflecting Ag–ZnO back contact. Light trapping is achieved by combining a periodically textured substrate and a diffusing ZnO front contact. Single- junction microcrystalline cells with a stable efficiency of 8.7% are achieved with an i-layer thickness of 1.2 mm. In tandem devices we obtain an efficiency of 10.9% (initial) with an open circuit voltage of 1.35V and a fill factor (FF) of 71.5%. These cells are slightlytoplimitedwith11.26and11.46mA/cm2 in the amorphous (270nmthick) and the microcrystalline (1.2 mm thick) sub- cells, respectively. We introduce an intermediate reflector (IR) between the bottom and the top cell because it allows increasing the top cell current without compromising the stability by a thicker absorber. The IRs consist of either an ex-situ ZnO or a low refractive index P-doped silicon– oxygen compound deposited in-situ with a plasma process that is fully compatible with solar cell processing. We demonstrate significant current improvement (up to 8% relative) using both kinds of IRs

    Mechanical characterization of brushite and hydroxyapatite cements

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    Compression, tension and torsion tests were designed and completed successfully on a brushite and a precipitated hydroxyapatite cement in moist condition. Elastic and strength properties were measured for these three loading cases. For each cement, the full set of strength data was fitted to an isotropic Tsai-Wu criterion and the associated coefficients identified. Since the compressive Young's moduli were about 10% larger than the tensile moduli, the full set of elastic data of each cement was fitted to a conewise linear elastic model. Hysteresis of the stress-strain curves was also observed, indicating dissipation mechanisms within these cement microstructures. A comparison of the measured mechanical properties with human cancellous bone confirmed the indication of brushite as a bone filling material and the potential of the hydroxyapatite cement as a structural biomaterial
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