Conception du système de transmission OFDM codé pour les applications à haut débit

On observe de nos jours un intérêt considérable pour de nouvelles technologies sans fil capables de réaliser des hauts débits, comme l'OFDM qui offre une forte protection pour les canaux à trajets multiples. Les perturbations qui interviennent sur ce type de canaux induisent des erreurs de transmission que le codage de système s'efforce de combattre pour assurer un taux d'erreur minimal. Dans ce travail, on propose un système OFDM qui est capable d'offrir une protection améliorée aux trajets multiples, grâce à l'insertion d'un intervalle de garde et une robustesse développée grâce à l'entrelacement temporel des données transmis et un codage de correction d'erreurs. Nous présentons les résultats obtenus en utilisant des codes convolutionnels et des codes Reed Solomon. Le système a été implanté sous Simulink de Mathworks. On a évalué l'effet du choix du code et de l'entrelacement sur la performance du système OFDM. L'analyse des performances du système avec le codage Reed-Solomon montre une amélioration dans l'environnement à trajets multiples. Les performances en terme de taux d'erreurs sont présentées pour différents paramètres de transmission, afin de définir les méthodes et les valeurs optimales du système de transmission OFD

Activité antifongique in vitro du phoséthyl-Al sur quelques souches de Verticillium albo-atrum Reinke & Berthold

La fongitoxicité du phosphonate, métabolite actif du phoséthyl-Al est modulée par la composition des milieux de culture. Sur le Cristomalt (milieu naturel) la toxicité du phosphonate vis-à-vis du Verticillium albo-atrum Reinke & Berthold. fonne à microsclérotes. est beaucoup plus grande que sur le Ribeiro (milieu synthétique). L'addition du phosphate au milieu de culture abaisse l'efficacité du phosphonate. Ce sont toujours les souches de Verticillium pathogènes sur la tomate, qui sont les plus sensibles au phoséthyl-Al.In vitro antifungal activity of fosetyl-Al on several strains of Verticillium albo-alrum Reinloe & BertholdToxicity of phosphonate, the active breakdown product of the fosethyl-Al, is modulated by culture media composition. On the Cristomalt ( natural medium), phosphonate toxicity against Verticillium albo-atrum Reinke & Berthold,-microsclerotial fonn, is higher than in synthetic media (Ribeiro). Phosphate is the main constituent of culture medium which modifies phosphonate fungitoxicity. Strains ofVerticillium, pathogenicon tomato, are al ways more sensitive" to fosethyl-Al

License Artistic-2.0 Suggests MASS, flowCore, xtable

Description flowQB is a fully automated R Bioconductor package to calculate automatically the detector efficiency (Q), optical background (B) and intrinsic CV of the beads. Imports Biobase, graphics,methods, flowCore,stats,MAS

Quasi-Monte Carlo simulation of diffusion

International audienc

Automated Quadratic Characterization of Flow Cytometer Instrument Sensitivity ∗ (flowQB Package: Advanced Processing Using Data NIH2)

Under the Artistic License, you are free to use and redistribute this software.

Microstructure and crystallographic properties of Cu77Zn21 alloy under the effect of heat treatment

International audienceThe influence of heat treatment process on microstructure and physiochemical properties of Cu77Zn21 alloy was studied. Samples were heated from 300 to 700°C for 15 minutes and gradually cooled to room temperature. Samples were characterized using mechanical testing and surface analysis techniques. It was observed that the grain size increases with the increasing temperature. The decrease in hardness is due to composition change of the Cu-Zn alloy attributed to zinc diffusion.XRD shows the presence of only α brass with a preferential orientation along the (111) plane. The analyses show that temperature affects the crystalline parameters. The rms microstrain was reduced mainly by thermal activation. The heat treatment promotes atomic diffusion and leads to a better crystallinity of the particles. The results of Raman investigations confirmed the changes in the Cu-Zn alloy surface composition with a clear enrichment in CuO. This behavior correlates with the results obtained by mechanical testing. © 2018, © 2018 Informa UK Limited, trading as Taylor and Francis Group

Microstructure and crystallographic properties of Cu77Zn21 alloy under the effect of heat treatment

The influence of heat treatment process on microstructure and physiochemical properties of Cu77Zn21 alloy was studied. Samples were heated from 300 to 700°C for 15 minutes and gradually cooled to room temperature. Samples were characterized using mechanical testing and surface analysis techniques. It was observed that the grain size increases with the increasing temperature. The decrease in hardness is due to composition change of the Cu-Zn alloy attributed to zinc diffusion.XRD shows the presence of only α brass with a preferential orientation along the (111) plane. The analyses show that temperature affects the crystalline parameters. The rms microstrain was reduced mainly by thermal activation. The heat treatment promotes atomic diffusion and leads to a better crystallinity of the particles. The results of Raman investigations confirmed the changes in the Cu-Zn alloy surface composition with a clear enrichment in CuO. This behavior correlates with the results obtained by mechanical testing. © 2018, © 2018 Informa UK Limited, trading as Taylor and Francis Group