Perrin, Francis

Perkin, William Henry, Jr., 168, 169, 173, 176-181 passim Perkin, William Henry, Sr., 168 Perren, E. A., 201 Perrin, Francis, 127... 

Perrin, Francis. 1939. Calcul relatif aux conditions ventuelles de transmutation en chaine de I uranium. Comptes Rendus 208 1394. 

Perrin, J. (1909) Annales de Chimie et de Physique 18, 1. English translation by F. Soddy, Brownian Movement and Molecular Reality (Taylor Francis, London) 1910. 

Berberan-Santos, M. N. (2001). Pioneering contributions of Jean and Francis Perrin to molecular luminescence. In New Trends in Fluorescence Spectroscopy (Valeur, B. and Brochon, J. C., eds.). Springer, Berlin, pp. 7-33. 

This relationship is called Perrin s equation, because it was established for the first time by Francis Perrin it was written at that time with polarization ratios... 

Laboratoire Francis Perrin (CNRS-URA-2453), DSM/DRECAM/Service des Photons, Atomes et Molecules, C.E.A. Saclay, F-91191 Gif-sur-Yvette Cedex, France... 

Laboratoire Francis Perrin, CEA/DSM/IRAMIS/SPAM - CNRS URA 2453, CEA/Saclay, 91191 Gif-sur-Yvette, France dimitra.markovitsi cea.fr... 

Laboratoire Francis Perrin CEA/DSM/IRAMIS/SPAM - CNRS URA 2453... 

Laboratoire Francis Perrin (URA 2453 CEA-CNRS), CEA Saclay, Bat. 522, 91191 Gif-sur- Yvette Cedex, France... 

Perrin, J., Brownian Motion and Molecular Reality. Taylor Francis, London, 1910. 

Perkins, Wendy. The Uses of Science. The Montmor Academy, Samuel Sorbiere and Francis Bacon. Seventeenth-Century Prench Studies 7, 1985, 155-162. Perrin, C. E. Prelude to Lavoisier s Theory of Calcination Some Observations on Mercurius calcinatus per seT Ambix 16, 1969, 140-151. 

CHIMIE MINERALE. — Sur un exemplc de reduction formelle fluoralion du trioxy difluorure d osmium. Note ( ) de MM. IVguie. -IV iii et IVeii. Bahtlett, presentee par M. Francis Perrin. 

J. Perrin, Mouvement brownien et moleculaire culaire. Ann. chim. Phys. VIII 18, 5-114 translated by F. Soddy as Brownian Movement and Molecular Reality, Taylor and Francis, London. 

Peierls had already contributed significantly to the debate on the possible explosive effects of fission. The previous May one of Fr6d6ric Joliot s associates in Paris, Francis Perrin, had published a first approximate formula for calculating the critical mass of uranium—the amoimt of uranium necessary to sustain a chain reaction. A lump smaller than a critical mass would be inert a lump of critical size would explode spontaneously upon assembly. 

The possibility of a critical mass is anchored in the fact that the surface area of a sphere increases more slowly with increasing radius than does the volume (as nearly p- to r ). At some particular volume, depending on the density of the material and on its cross sections for scattering, capture and fission, more neutrons should find nuclei to fission than find surface to escape from that volume is then the critical mass. Estimating the several cross sections of natural uranium, Francis Perrin put its critical mass at forty-four tons. A tamper around the uranium of iron or lead to bounce back neutrons might reduce the requirement, Perrin calculated, to only thirteen tons. 

Castro, C. Mecanismes de croissance de nanotubes de caibone aUgnes relation catalyseur -nanotube, in Laboratoire Francis PERRIN, p. 189. Universite Paris Sud, Gif-sur-Yvette (2009)... 

Presentations of Jablohski s contribution to spectroscopy in the frame of the evolution of science and political situation in the 1930s and 1940s have been published [14, 15]. The contribution of Jacques and Francis Perrin, Jablonski, Vavilov, Levshin, Lewis, and Kasha to the definition of state diagram has been critically evaluated and the originality of each one commented by Nickel [16, 17]. The topic was discussed at the first congress on photoluminescence in Warsaw, May 20-25, 1936 (Pringsheim president, Jablonski secretary). The lively discussion that took place on that occasion has been retraced in detail by Nickel [18]. 

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