Contribución al conocimiento de los foraminíferos del Rocanense de la cuenca de Añelo (provincia de Neuquén)

A foramíníferal fauna From three profiles coIlected in cuenca de Añelo (Provincia de Neuquén ) has been studíed. A list of bentonic and planctonic specimens ís given. From planctonic foramínífera Globoconusa daubiergensis, Subbotina triloculidinoides and Turborotalia peudobulloides, a Lower Paleocene age js assigned to the studied samples.Facultad de Ciencias Naturales y Muse

Contribución al conocimiento de los foraminíferos del Rocanense de la cuenca de Añelo (provincia de Neuquén)

A foramíníferal fauna From three profiles coIlected in cuenca de Añelo (Provincia de Neuquén ) has been studíed. A list of bentonic and planctonic specimens ís given. From planctonic foramínífera Globoconusa daubiergensis, Subbotina triloculidinoides and Turborotalia peudobulloides, a Lower Paleocene age js assigned to the studied samples.Facultad de Ciencias Naturales y Muse

Contribución al conocimiento de los foraminíferos del Rocanense de la cuenca de Añelo (provincia de Neuquén)

A foramíníferal fauna From three profiles coIlected in cuenca de Añelo (Provincia de Neuquén ) has been studíed. A list of bentonic and planctonic specimens ís given. From planctonic foramínífera Globoconusa daubiergensis, Subbotina triloculidinoides and Turborotalia peudobulloides, a Lower Paleocene age js assigned to the studied samples.Facultad de Ciencias Naturales y Muse

Set up of a methodology for participatory plant breeding in bread wheat in France

In Organic Agriculture, cultivation environments and agronomic practices are very diverse. This diversity can be handled with decentralized selection based on the knowledge of farmers and scientists. A collaborative work between associations from Réseau Semences Paysannes and the DEAP team from INRA du Moulon set up an innovative breeding approach on farm based on decentralization and participation of farmers. This approach makes it possible to (i) create new population varieties of bread wheat locally adapted (genetic innovation) (ii) set up an organizational scheme based on decentralization and co construction between actors (societal innovation) and (iii) develop experimental designs, create statistical and data management tools which stimulate these genetic and societal innovations

Approximate message passing with a colored aliasing model for variable density Fourier sampled images

The Approximate Message Passing (AMP) algorithm eciently reconstructs signals which have been sampled with large i.i.d. sub-Gaussian sensing matrices. However, when Fourier coecients of a signal with non-uniform spectral density are sampled, such as in Magnetic Resonance Imaging (MRI), the aliasing is intrinsically colored. Consequently, AMP’s i.i.d. state evolution is no longer accurate and the algorithm encounters convergence problems. In response, we propose an algorithm based on Orthogonal Approximate Message Passing (OAMP) that uses the wavelet domain to model the colored aliasing. We present empirical evidence that a structured state evolution occurs, where the e↵ective noise covariance matrix is diagonal with one unique entry per subband. A benefit of state evolution is that Stein’s Unbiased Risk Estimate (SURE) can be e↵ectively implemented, yielding an algorithm with no free parameters. We empirically evaluate the e↵ectiveness of the parameterfree algorithm on a synthetic image with three variable density sampling schemes and find that it converges in over 20x fewer iterations than optimally tuned Fast Iterative Shrinkage-Thresholding (FISTA)

Approach to better assess Fission Gas Behaviours, applicable to Fuels with Complex Microstructures

International audienc

Approach to better assess fission gas behaviors, applicable to fuels with complex microstructures

International audienceThe industrial fission gas behavior model CARACAS developed and validated for LWR-UO2 fuels in different fuel performance codes at CEA, EDF and AREVA is now being adapted to simulate the behavior of fuels with complex microstructures. In the current industrial licensed code, the description of such fuel is based on homogenization of the pellet, whereas for CEA's fuel performance code ALCYONE, this microstructure can be modelled by inclusions surrounded by a continuous matrix. The main objectives of the CARACAS fission gas model are to propose a continuous approach in both steady-state and off-normal conditions, but also to make it depend on the initial microstructure of the material. To model the fission gas behavior in such a complex microstructure, we assume that the behavior of each phase can be modeled as a homogeneous phase. First, neutron model provides CARACAS model the average local power rate, fission density and xenon/krypton production in each phase. Then, in CARACAS model, the first way of coupling between phases is done by the fission gas production mechanism, in which the recoil of fission gas atoms and their implantation from one phase to the other is taken into account. This heterogeneity of fission distribution and fission gas atoms production leads also to a heterogeneous swelling of the material, and so to a heterogeneous distribution of stress in the microstructure.It is now possible to take into account the heterogeneity of stress induced by this heterogeneous swelling and its feedback on the fission gas behavior model, thanks to the micro-mechanical behavior law. As the fission gas behavior model (particularly the gaseous swelling and the intragranular/intergranular gas distribution) depends at first order on the hydrostatic stress, the distribution of stress in the microstructure is very important. As this approach is very time-consuming, it is more dedicated to research applications or to very specific design calculations such as refined accidental initializations. For standard industrial applications, some simplifications are done. Depending on the representation of the microstructure in the fuel performance code where the model is implemented, different hypothesis are presented homogeneous or heterogeneous. Comparison of calculated results in both configurations with experimental data is also presented. An attempt of uncertainty quantification in relation to experimental conditions of the validation database is also performed