Suchergebnisse

Résumé L'Internet est entré dans la vie des hommes, des entreprises et des États, suscitant d'inévitables problèmes de pouvoir. Comment, par exemple, protéger le citoyen dans la sphère administrative ou commerciale ? Les logiciels libres sont-ils un élément nécessaire de la souveraineté numérique ? Comment assurer le gouvernement global de l'Internet ? Le « territoire nouveau » de l'information doit être administré dans le cadre d'une logique nouvelle, articulant institutions privées et publiques.

The World Summit on the Information Society, held in Geneva in 2003 & in Tunis in 2005, has been the greatest summit ever organized by the UN, by the number of members of "civil society." It shows a true awareness on the Internet governance subject. The Athens Forum, which will be held October 30th 2006, will perhaps be the place where tensions & tectonic moves that shake the Internet will express themselves. Between Tunis & Athens, the problem of the political stakes of the Internet comes back to the table. As Internet has become the nervous system of our societies, it is not surprising that it raises serious questions on power, at a world level, & therefore that it raises geopolitical questions. Adapted from the source document.

Two-dimensional axisymmetric simulations of pressurized thermal shock (PTS) phenomena through Neptune_CFD module are presented aiming at two-phase models validation against experimental data. Because of PTS complexity, only some thermal-hydraulic aspects were considered. Two different flow configurations were studied, occurring when emergency core cooling (ECC) water is injected in an uncovered cold leg of a pressurized water reactor (PWR)—a plunging water jet entering a free surface, and a stratified steam-water flow. Some standard and new implemented models were tested: modified turbulent - models with turbulence production induced by interfacial friction, models for the drag coefficient, and interfacial heat transfer models. Quite good agreement with experimental data was achieved with best performing models for both test cases, even if a further improvement in phase change modelling would be suitable for nuclear technology applications.