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Bien qu'il soit difficile de distinguer chaque forme de colite, de nombreux signes radiologiques aident a[grave ] confirmer ou a[grave ] orienter de[acute ]finitivement le diagnostic. Cet article a pour but de familiariser le praticien avec la se[acute ]miologie radiologique,e[acute ] chographique, tomodensitome[acute ]trique de la maladie de Crohn et de la rectocolite he[acute ]morragique. L'inte[acute...
A random PSK modulated signal generated with an optical waveguide phase modulator is used to obtain an error signal and lock the frequency of an AlGaAs semiconductor laser to the /sup 7/Rb D/sub 2/ line. The measured error signal is similar to that obtained with sinusoidal phase modulation under the same conditions. The technique could be applied to longer wavelength lasers and other types of laser...
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