12 research outputs found

    LA REINTRODUCTION DU GYPAETE BARBU (GYPAETUS BARBATTYS) DANS LES ALPES FRANCAISES

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    MAISONS-ALFORT-Ecole Vétérin (940462302) / SudocSudocFranceF

    Rehydration behaviour and ageing of dairy powders assessed by calorimetric measurements

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    On the basis of dissolution enthalpy measurements, the aims of this study were i) to investigate the feasibility of lassifying the dissolvability of various dairy powders, and ii) to establish whether a change in rehydration behaviour that occurs with ageing could be predicted. No clear correlations could be established between the exothermic or endothermic nature of the calorimetric response and the rehydration ability of the powders studied. Dissolution enthalpy cannot thus be considered an absolute parameter that could be used to classify one dairy powder among others. On the contrary, it is experimentally shown that dissolution enthalpy is very sensitive both to the composition and the physical state of the powder. Consequently, dissolution enthalpy value can be considered as a marker representative of the manufacturing process and storage conditions. Evidence is made that following dissolution enthalpy over time could be a way to detect changes in powders due to ageing

    Scénarios d’extrêmes hydrologiques

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    Le projet Explore2 a produit un ensemble de projections hydrologiques suivant plusieurs scénarios climatiques pour la France hexagonale. L’objet de ce rapport est de présenter les scénarios d’évolution des extrêmes hydrologiques, concernant les épisodes de pluies intenses, crues, sécheresses météorologiques, agronomiques, hydrologiques, hydrogéologiques et assecs des cours d’eau

    The ThomX ICS source

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    International audienceThomX is a new generation Compact Compton Source. It is currently commissioned by and at the IJCLab (Laboratoire de physique des 2 infinis - Irène Joliot-Curie (UMR9012)) at Orsay. The first beam is expected at the begining of 2021. The aim of ThomX is to demonstrate the characteristics of an intense and Compact (lab-size) X-ray source based on Compton Scattering. The performances are mostly driven by the laser optical system which is above the state of the art of stored laser power. Proof of principle of various X-ray techniques will be performed thanks to the versatile ThomX beamline. Firstly, this article presents the machine description. Secondly, the issues and limits of the laser system are discussed. Then, the ThomX beamline is described and the machine status conclude the ThomX presentation. Finally, the expected performances for the next years and the possible experiments that can be made with this new machine are detailed

    First production of X-rays at the ThomX high-intensity Compton source

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    International audienceWith the increase in laser power and finesse of optical cavities over the last decade, laboratory-size Compton sources are very promising. These sources produce X-rays through interactions between relativistic electrons and laser photons and, in term of brightness, fall between large synchrotron facilities and classical laboratory X-ray sources. The ThomX source is the French project in this field. This article first presents a state of the art of high-intensity Compton sources, then the ThomX source is briefly described, and the first results are detailed, in particular the production of the first X-rays, the acquisition of the first spectrum and the first image of the beam. Finally, the next objectives are discussed
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