Serge Haroche, Administrateur of the Collège de France since 1 September 2012

Profile of David Wineland and Serge Haroche, 2012 Nobel laureates in physics.

As a postdoctoral student at the Massachusetts Institute of Technology in 1978, I trolled the literature, seeking inspiration for my career as an experimental physicist. One article that caught my attention described the first laser-cooling experiment. David Wineland et al. at the National Bureau of Standards (NBS, now the National Institute of Standards and Technology) in Boulder, CO, had trap...

Capillary - gravity waves : The effect of viscosity on the wave resistance D . Richard , E . Raphaël Collège de France

The effect of viscosity on the wave resistance experienced by a two-dimensional perturbation moving at uniform velocity over the free surface of a fluid is investigated. The analysis is based on Rayleigh's linearized theory of capillary-gravity waves. It is shown in particular that the wave resistance remains bounded as the velocity of the perturbation approaches the minimum phase speed c min =...

Collège de doctorat en Sciences de l’Ingénieur Architecture – Géologie- Construction

This numerical investigation of an advanced Gurson–Tvergaard–Needleman(GTN) model is an extension of the original work of Ben Bettaieb et al. (2011). The model hasbeen implemented as a user-defined material model subroutine (VUMAT) in the Abaqus/explicitFE code. The current damage model extends the previous version by integrating the threedamage mechanisms: nucleation, growth an...

In the September 2012 issue

Rzeszow – Sofia September 2012

We consider queuing systems as models of distance learning system we analyze how characteristics of business process in the system affect on throughput and on learning outcomes. The processes of executing tasks and tasks validation process are the key processes in the distance learning. A model of the process performed by a student is a queuing system with refusals. A model of the process perfo...