en examinant une serie de composes homologues tels que, les hydrocarbures, les alcools, les acides organiques, etc. on remarque les points d'ebullition et de fusion croissent avec la masse moleculaire, neanmoins, il n'ya aucune relation simple entre le point d'ebullition, ou le point de fusion et la grandeur moleculaire en comparant des molecules de types differents. l'align...

At Princeton we have been studying shaped pupil coronagraphs for high contrast imaging and planet finding. These will find applications in both ground and space imaging. In this article we summarize the design procedure for shaped pupils and review the various families of designs we have found. We describe the manufacturing processes we have used to make free standing shaped pupil masks and rev...

Résumé Cet article se propose d’étudier le processus par lequel construit puis perpétue une renommée savante en considérant cas de Sylvain Lévi (1863-1935), professeur langue et littérature sanskrites au Collège France qui fut pendant 15 ans (1920-1935) président l’Alliance israélite universelle. On analyse la sur les trois plans que sont nom propre, l’œuvre actions dans lesquelles il s’est eng...

We compare the exact tunneling time with the quasi-classical tunneling time for idealized potentials. We examine three one-dimensional cases where the potential is chosen to have a simple form. In each case, the exact tunneling time and the quasi-classical time differ significantly. In one case, the two differ in magnitude by a factor of about ten. In another case, the two differ not only quant...

Real-time optimization (RTO) is a class of methods that use measurements to reject the effect of uncertainty on optimal performance. This article compares six implicit RTO schemes, that is, schemes that implement optimality not through numerical optimization but rather via the control of appropriate variables. For unconstrained processes, the ideal controlled variable is the cost gradient. It i...