Search results for "activité"

Elaboration and interfacial reactivity of Lanthanum Strontium Chromium Ruthenium (LSCrRu) perovskite oxides as intermediate temperature fuel cell (IT…

2005

New data on the interest of ruthenium doped lanthanum strontium chromite La1-xSrxCr1-yRuyO3δ (LSCrRu) as anode in ITSOFC are presented. Microwave synthesis of mixed oxides allowed shaping of half-cells and complete cells using sputtering and screen printing methods. LSCrRu methane reforming property had been studied in a mono-chamber system coupled with a mass spectrometer in collaboration with Institut de REcherche Hydro-Québec. Anode/electrolyte interfacial reactivity had been analysed using SIMS and XRD on half cells models after ageing under H2 at 800°C. This experiment gave the chemical composition of the film after treatment. Complete cells, tested under working conditions, highlight…

Fabrication and characterization of barium silicate ultrathin films as an alternative gate oxide

2008

Down-scaling of elementary CMOS elements requires the replacement of SiO2 as a gate oxide. By the identification of the formation conditions of barium silicate in direct contact of a silicon substrate, this study revealed a potential candidate. First of all, a reaction between Ba and SiO2 leading to the formation of barium silicate as been evidenced by in-situ XPS and SR-PES analyses. Then, barium silicate films have been elaborated by oxygen and barium co-deposition at 580 °C. Thermal treatments under vacuum showed that barium silicate was thermally stable up to 900 °C. TEM and SIMS ex-situ analyses revealed a sharp interface with the substrate. Finally, an experimental setup dedicated to …

Une architecture programmable de traitement des impulsions zéro-temps mort pour l'instrumentation nucléaire

2015

In the field of nuclear instrumentation, digital signal processing architectures have to deal with the poissonian characteristic of the signal, composed of random arrival pulses which requires current architectures to work in dataflow. Thus, the real-time needs implies losing pulses when the pulse rate is too high. Current architectures paralyze the acquisition of the signal during the pulse processing inducing a time during no signal can be processed, this is called the dead time. These issue have led current architectures to use dedicated solutions based on reconfigurable components such as FPGAs. The requirement of end users to implement a wide range of applications on a large number of …

Analyse de tâches et évaluations : l'activité des administrateurs de systèmes informatiques

1998

Rapport de contrat Bull INRIA; Description formelle des différentes tâches exécutées par les administrateurs de systèmes informatiques.

Effets de l'hypnose dans des tâches cognitives et émotionnelles

2011

National audience; L’étude réalisée au sein du LEAD, CNRS – UMR 5022 avec la collaboration des Professeurs Emmanuel Bigand et Antoine Bioy a pour objectif de tester l'effet de l'hypnose dans les tâches cognitives et émotionnelles. Ce forum est ainsi l’occasion de présenter pour commencer, de façon non exhaustive, les recherches scientifiques qui ont mis en évidence une augmentation du flux sanguin dans certaines aires cérébrales lors de l’état hypnotique par rapport à un état de conscience ordinaire. Ces recherches ont étaient le point de départ notre l’étude, dont l’hypothèse principale est que l'augmentation l’activité cérébrale dans les aires des cortex pré frontaux, frontaux inférieurs,…

Déterminisme du pouvoir protecteur de Fusarium oxysporum : recherche de gènes impliqués dans l'interaction protectrice avec la tomate

2007

Fusarium oxysporum is a common soil borne fungus, well represented in every type of soils, throughout the world. This species includes pathogenic strains inducing severe diseases in many crops and strains able to protect a plant against the infection by a pathogenic strain. The protective strains are not only non pathogenic strains isolated from suppressive soils but also pathogenic strains applied to a non host plant. The protective capacity of these strains is mainly based on mechanisms of competition and induced resistance of the plant The main objective of this work was to identify fungal genes involved in the protective capacity of these strains and associated to the elicitation of pla…

Comparison of different tillage systems in organic farming : effect of soil structure and organic matter repartition on soil micro-organisms and thei…

2009

Over the last decades, the surface traditionally ploughed has tended to decrease and replaced by shallow working tillage techniques without soil inversion, i.e., no tillage or reduced tillage with tines or discs. These techniques were mostly developed in conventional farming systems but nowadays they are also developed in organic farming systems. Nevertheless, these tillage techniques could generate crop nutrients deficiencies and a deterioration of soil structure, especially during the first years of their application. As the use of synthetic fertilizers is forbidden in organic farming, a decrease of the soil fertility could be very detrimental for crop growth. Indeed, soil micro-organisms…

Rôle relatif des facteurs individuels, de l’alimentation et de l’activité physique sur la variation de poids sur 5 ans

2016

Introduction et but de l’étude : Les facteurs individuels, les consommations alimentaires, l’activité physique et le statut pondéral forment un ensemble de relations causales complexes. Cependant, le rôle relatif des déterminants individuels, de l’alimentation et de l’activité physique sur les variations de poids n’a pas encore été étudié. L’objectif de cette étude était d’établir un cadre conceptuel causal en estimant l’influence relative des facteurs individuels, des consommations alimentaires et de l’activité physique sur la variation de poids sur 5 ans au sein d’une population d’adultes français.Matériel et méthodes : A l’inclusion, les caractéristiques individuelles, l’activité physiqu…

Etude dynamique et structurale de biomolécules par microscopie à force atomique HS-AFM : application à une petite protéine de choc thermique sHsp

2012

The atomic force microscopy (AFM) gives access to the topography of organic and inorganic samplesat the atomic scale. The latest innovations offer the possiblity to understand the sample nano-mechanicalproperties (elasticity, adhesion...). Its feature set allows overcoming the demands of nanotechnology,both in the fields of physics, chemistry and biology.However, understanding biological processes require faster acquisitions for the atomic forcemicroscopy, less than a second per frame. As conventional equipment does not offer the possibility toovercome the constraint of time for dynamical studies, a prototype of high-speed atomic forcemicroscope (HS-AFM) was developed in partnership with Pr…

Recently identified microbial guild mediates soil N2O sink capacity

2015