Girardi, E A new methodology for the solution of the neutron transport equation, based on domain decomposition has been developed. This approach allows us to employ different numerical methods together for a whole core calculation: a variational nodal method, a discrete ordinate nodal method and a method of characteristics.
These new developments petits changements maigrir the use of independent spatial and angular expansion, non-conformal Cartesian and unstructured meshes for each sub-domain, introducing a flexibility of modeling which is not allowed in today available codes.
Rebaine, Ali Ce travail consiste en la simulation numerique des ecoulements internes compressibles bidimensionnels laminaires et turbulents. On s'interesse, particulierement, aux ecoulements dans les ejecteurs supersoniques.
Among them, one particular application: the benchmark model of the Phebus experimental facility at Cea-Cadarache, shows why this new methodology is relevant to problems with strong local heterogeneities. This comparison has showed that the decomposition method brings more accuracy all along with an important reduction of the computer time.
Although there is a growing recognition of the importance to protect these areas, it remains that their integrity is still threatened by the pressure of human activities.
The inventory and the systematic monitoring of wetlands are a necessity and remote sensing is the only realistic way to achieve this goal. This thesis is based on two hypotheses Ch. The first hypothesis stipulate that classes of plant physiognomies, based on plant structure, are more appropriate than classes of plant species because they are best adapted to the information content of polarimetric radar data.
The second hypothesis states that polarimetric decomposition algorithms allow an optimal extraction of polarimetric information compared to a multi-polarized approach based on the HH, HV and VV channels Ch. In particular, the contribution of the incoherent Touzi decomposition for the inventory and monitoring of wetlands is examined in detail.
This decomposition allows the characterization of the scattering type, its phase, orientation, symmetry, degree of polarization and the backscattered power of a target with a series of parameters extracted from an analysis of the coherency matrix eigenvectors and eigenvalues.
The lake Saint-Pierre region was chosen as the study site because of the great diversity of its wetlands that are covering more than 20 ha. One of the challenges posed by this thesis is that there is neither a standard system enumerating all the possible physiognomic classes nor an accurate description of their characteristics and dimensions.
This project was conducted by four research groups, three of them having expertise in nutrient cycling of three major agro-ecosystems arable crops, grasslands, forests and the fourth one having expertise in modelling long term effects of land use on C storage into the soils. Within this common project one major objective was to better understand the fate of plant litter entering the soil either as above litter or as root litter.
The water exposure of aryl hydrocarbon receptor AhR agonists was assessed by the VOs. High TEQbio value in diluted extract and low TEQbio in concentrated extract of the same sample was observed suggesting potential non-additive effects in the mixture.
The focus was put on two factors that particularly affect decomposition: the initial biochemical brian flemming perte de poids instagram of plant litter, and the location of the decomposing litter. Another aspect was the simultaneous study of C and N. The project consisted in experiments relevant for each agro-ecosystem, in forest, grassland and arable soils for which interactions between residue quality and nitrogen availability on the one hand, residue quality and location on the other hand, was investigated.
A common experiment was set up to investigate the potential degradability of the various residue used beech leaf rape straw, young rye, Lolium and dactylic roots in a their original soils and in a single soil was assessed.
Ep 65 - -20 kg :) Photos Avant/Après Perte de poids [Rééquilibrage alimentaire - Régime]