Search results for "agrégation"
showing 10 items of 24 documents
The microscopic theory of diffusion-controlled defect aggregation
1998
Abstract The kinetics of diffusion-controlled aggregation of primary Frenkel defects ( F and H centers) in irradiated CaF 2 crystals is theoretically studied. Microscopic theory is based on the discrete-lattice formalism for the single defect densities (concentrations) and the coupled joint densities of similar and dissimilar defects treated in terms of the Kirkwood superposition approximation. Conditions and dynamics of the efficient F center aggregation during crystal heating after irradiation are analyzed.
SURCOTES MARINES DANS LE GOLFE DU LION ET FORCAGES ATMOSPHERIQUES : VARIABILITE CONTEMPORAINE ET FUTURE (1950-2100)
2010
Sea surges in the Gulf of Lions are mainly forced by southerly and south-easterly winds. This regional-scale atmospheric circulation is leading by a strong zonal gradient between low pressure system over the Bay of Biscay and high pressure over central Europe. This synoptic-scale circulation mostly happens during “Greenland Above” weather regime. In the second half of the 20th century, a slow increase of the sea-level pressure over central Europe increased the probability of having “Greenland Above” weather types associated with a southerly atmospheric circulation in the Gulf of Lions, thus leading to strong surges. A linear regression is used to simulate the interannual variability of high…
Nommer l'extrême gauche autour de 1937, topique(s) de l'agrégation trotskiste
2012
International audience
The Obama Presidency
2019
International audience
The kinetics of defect aggregation: A novel lattice formalism
1995
We introduce a stochastic model for the A + B → O reaction on a discrete lattice. The system may include mono- and bimolecular steps (i. e. reaction and diffusion steps). The resulting infinite chain of equations is truncated at a certain level via a modified Kirkwood approximation.
Heparin-induced priapism
2001
Heparin-induced priapism constitutes a special form of pharmaco-induced prolonged erection, but the pathophysiological principles are not yet definitely clear. Heparin-induced antiplatelet-antibodies may lead to the aggregation of thrombocytes and thus alter the penile blood flow leading to low-flow priapism. Alternatively, this condition may be explained by initial high-flow priapism that later turns into ischemic priapism. The question remains whether hemorrhage with subsequent organisation of the hematoma and late fibrosis constitutes a pathogenetic factor. Besides this pathogenetic discussion, this paper presents the differential diagnosis of priapism as well as diagnostic and therapeut…
Proposition méthodologique pour la visualisation et l'exploration des mobilités géographiques
2016
Daily mobility data are multidimensional and desaggregated, what make them hard to manipulate and to analyze. Although methods of representation and analyze have been proposed, none of them seem to be able to efficiently bring out knowledge from data. We propose to combinate this solutions and a methodology of innovative reaggregation to visualize and explore mobility data.
Contribution of a new dynamic climate regionalization protocol for estimating the water balance of Douglas-fir forests
2022
Quantifying the regionalized impacts of climate change on forests is a major ecologicaland socio-economic issue. The decline of Douglas-fir (Pseudotsuga menziesii) has been observed forabout 20 years and should be accelered. Recent work shows that regionalized estimation of waterbalance under forest canopy is hampered by the ability of regional climate models to correctlysimulate precipitation amount and seasonal cycle. Here we evaluate the ability of a new climateregionalization protocol to simulate a realistic precipitation regime required for the calculation offorest soil water balance.
Désagrégation dynamique haute résolution spatiale du climat du Centre Est de la France par le modèle climatique régional ARW/WRF
2010
Ce travail analyse les capacités du modèle climatique régional ARW/WRF à reproduire les principaux traits du climat (températures de surface et précipitations) du Centre Est de la France à des résolutions spatiales fines, et pour les années 1991 et 2003. La simulation utilise pour la désagrégation du signal une descente d'échelle basée sur trois domaines emboîtés de maille variable de 120 km, 30 km et 7,5 km. Les conditions latérales sont imposées toutes les 6 heures par les ré- analyses ERA-Interim. Les températures et les précipitations observées par le réseau de mesures de Météo-France Bourgogne sont utilisées pour l'évaluation. Les simulations reproduisent bien la température (R²~0,95 e…
BODIPY - phosphane - gold complexes : towards the elaboration of optical theranostics
2015
This work describes new anticancer agents that could be detected by optical imaging, namely optical theranostics.After a first chapter describing the context of cancer imaging and therapy, a second chapter describes a first series of BODIPY-phosphine-gold theranostics, the synthesis of which has been optimized (less steps, shortening the reaction time, scale up). Their conjugation with biomolecules (glucose, peptide) has been achieved by developing a simple and efficient method that leads to the coupling between the gold atom of the probe and the thiol of the biomolecule (modified or not), leading to a gold sulfur bound. Hence, it makes the biovectorization of the probes possible in order t…