28 research outputs found

    Use of anticoagulants and antiplatelet agents in stable outpatients with coronary artery disease and atrial fibrillation. International CLARIFY registry

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    COMPOSITION ÉLÉMENTAIRE DE DIVERS TYPES DE GRANULES DANS LES CELLULES COTYLÉDONAIRES DU RADIS

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    Des poudres ou des empreintes obtenues à partir de cotylédons de graines sèches de Radis, ont été étudiées avec la microanalyse par sonde électronique et la spectrométrie de rayons X. De nombreux cristaux renferment divers éléments (P, Ca, Si, S, Mg et K). Certains ont un rapport Ca/P élevé. D'autres, plus rares, ont une forte proportion Si/P. Enfin, des granules très petits sont riches en fer.Powders or prints samples obtained from cotyledons of dry seeds of Radish, were studied by EPMA. Many crystals contained several elements (P, Ca, Si, S, Mg and K). Some had a high Ca/P ratio. Others, more scarce, were characterized by a high Si/P ratio. Very light granules possessed much iron

    Novel concept of interferometric control of the moving coil in watt balance

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    International audienceOne of the most promising projects for the new definition of the kilogram is the watt balance. It uses a two-mode procedure: static mode and dynamic mode. One of the key points is to control the velocity, the yaw and the pitch of a moving coil during the dynamic mode. We have developed a specific method based on the use of a homemade double pass heterodyne interferometer, a two-level translation stage, and a home-made high frequency phase shifting electronic circuit. However, the commercial heterodyne sensor is limited in power and has polarization limitations. In this paper, we propose a novel and specific heterodyne interferometer able to insure all previous demands to control the displacements of the moving coil in order to reduce the velocity noise. The laser source is powerful enough to ensure beams of measurements, the laser is frequency stabilized at 532 iodine atomic transition to ensure traceability, and all the polarization defaults of the classical heterodyne interferometer have been minimized in order to minimize non-linearity effects. The most original point is that the reference beam is lock-in on an external electronic reference, which allows to be less sensitive to vibration and polarization defects of optical components

    Accurate Ellipsometric Magnetic-Field Sensor Used to Align the LNE Watt Balance Magnetic Circuit

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    International audienceMagnetic-…eld sensors based on the Faraday e¤ect in a Tb 3 Ga 5 O 12 crystal are investigated in terms of their sensitivity, accuracy and directionality. The possibility of an increased sensitivity of such Faraday e¤ect sensors due to the application of multipass sensitive elements is considered. Signal-to-noise measurements on 5 mm diameter 20 mm long sample yield magnetic …elds equivalent noise of 300 nT=Hz 1=2 (= 1 s). The sensor has a sensitivity of 5.457(1) rad=T. Using spinning quarter waveplate ellipsometer, we can measure magnetic …elds to 1 T. The data acquisition rate could be up to 80 Hz. This sensor is used to check the homogeneity and orientation of the …eld provided by the LNE watt balance magnetic circuit which the aim is to rede…ne the SI unit of mass in the near future
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