Des société sans classes ?

Gestion dynamique des topologies sans fils

Dynamique des gaz quantiques (particules discernables sans spin)

Nous appliquons les résultats de deux articles précédents, en particulier uné equation cinétique généralisant l'´ equation de Boltzmann, ` a l'´ etude des gaz dilués quantiques hors d'´ equilibre. Par une simple extension de la méthode de Chapman Enskog appliquéè a cetté equation cinétique, nous calculons les propriétés hydrodynamiques du gaz. A l'ordre le plus bas (hydrodynamique d'Euler), nou...

Vers une Substitution des Services Web sans Inconsistance Sémantique

In order to ensure high availability of Web services, recently, a new approach was proposed based on the use of communities. In composition, this approach consists in replacing the failed Web service by another web service joining a community offering the same functionality of the service failed. However, this substitution may cause inconsistency in the semantic composition and alter its mediat...

Enrichissement Des Interpolations D’éléments Finis En Utilisant Des Méthodes sans Maillage

In the framework of meshless methods, the interpolation is based on a distribution of particles: it is not necessary to define connectivities. In these methods the interpolation can be easily enriched, increasing the number of particles (as in h-refinement of finite elements) or increasing the order of consistency (as in p-refinement of finite elements). However, comparing with finite elements,...

Classes de symétrie des solides piézoélectriques

We apply here the harmonic and Cartan decomposition techniques to piezoelectric material symmetries classification. We show in particular that we shall reduce from 19 to 17 the number of symmetry classes corresponding to the piezoelectric phenomenon. To cite this article: G. Geymonat, T. Weller, C. R. Acad. Sci. Paris, Ser. I 335 (2002) 847–852.  2002 Académie des sciences/Éditions scientifiqu...