S�miotique, structure et m�dias num�riques

High Et Photoproduction and the Photon Structure

Structure et proximité pour la recherche documentaire

Our study compares the effectiveness of an information retrieval system based on the proximity of the query term occurrences in the documents and an IRS based on a language model with Dirichlet smoothing and with the Okapi BM25 model. Our proximity based model computes at each position in the document a value much higher as some occurrences of all the query terms are close to this position. Mor...

structure electronique des semiconducteurs et chimisorption sur les semicondueteurrs

a- structure eleetronique des semicondueteurs . les oxydes semiconducteurs forment des reseaux ioniques. le diagramme de bandes correspondant aun cristal ideeal d'un oxyde tel que zno est forme uniquement de bandes completement remplies appartenant achacum des ions car, par definition, les ions zn et o= ont toutes leurs orbitals occupees par des doublets ou vides : zn 3d 4s zn 3d 4s o 2s 2...

Vortex structure and dynamics in -(ET) Cu(NCS)

We use Josephson plasma resonance (JPR) and DC torque magnetization measurements to investigate the vortex structure and dynamics in the layered organic superconductor -(ET) Cu(NCS) . JPR studies probe the AC response of this extreme type-II superconductor for currents driven along the low conductivity axis. An observed crossover in the magnetic "eld and temperature dependence of the JPR freque...

Modélisation de la Structure Complexe des Faits et des Mesures

Decision support system (DSS) goal is to help decision-makers. They are modeled mainly in a multdimiensional way, that means activity analysis subjects, called facts, with their measures are represented as the center of a star with dimensions and their parameters around. Several models have been devoted to DSS representation, but they handle only relationships between dimensions and their param...