RÉSUMÉ. Les exigences d’un logiciel, souvent rédigées en langage naturel, sont à la base des phases de conception et de test fonctionnel. Le langage naturel est par nature ambigu, et les exigences peuvent donc être différemment interprétées lors de la construction et de la validation du logiciel. C’est pourquoi nous proposons une méthode de raffinement progressif des exigences vers des modèles ...

In this document, we present research topic developed in the context of heteroge-neous data integration in plant functional genomic. Plant functional genomic is a biologicalframework where several disciplines and techniques take part in the discover of genes function.It generates a large quantity of data which the scientists manage in various ways. However,many data sources, com...

We study theoretically the spatiotemporal response of a lipid membrane submitted to a local chemical change of its environment, taking into account the time-dependent profile of the reagent concentration due to diffusion in the solution above the membrane. We show that the effect of the evolution of the reagent concentration profile becomes negligible after some time. It then becomes possible t...

introduction - les impuretes, meme en faibles teneurs, modifient beaucoup les proprietes physiques des metaux. ainsi, pour une etude profonde de ces proprie, tes , on a besion d'un metal extremement pur. la methode de la zone fondue a permis cette realisation . principe - dans la methode de purification dite de la «zone fondue» decouverte par pfann en 1952, une courte zone liquide est depl...

A fully automated system for the determination of δC and δO in atmospheric CO has been developed. CO is extracted from an air sample and converted into carbon dioxide (CO2) using the Schütze reagent. The isotopic composition is determined with an isotope-ratio mass spectrometer (IRMS) technique. The entire system is continuously flushed with high-purity helium (He), the carrier gas. The blank s...

Organic modification of nano-SiO2 particles was performed with supercritical CO2 as solvent and a titanate coupling reagent NDZ-201 as the modification reagent. The surface of the nano-SiO2 particles was changed after modification by the titanate coupling reagent from hydrophilic to hydrophobic. IR and thermo-gravimetric analyses indicate that the interaction between the titanate coupling reage...