A BPE model for the Burgers' equation

We study the BPE (Brownian particle equation) model of the Burgers equationpresented in the preceeding article [6]. More precisely, we are interestedin establishing the existence and uniqueness properties of solutions usingprobabilistic techniques.

De l'éclectisme à la pensée d'école en psychothérapie : la voie de l'anthropologie clinique

Ce texte est une prise de position claire face à la pluralité des pratiques psychothérapeutiques : se référant à l'anthropologie clinique, présentée ici selon ses trois visées (pratique, épistémologique et herméneutique), l'auteur rejette les positions extrêmes de l'éclectisme et du dogmatisme liée à la pensée d'école. Chaque thérapeute est invité à se situer dans le champ de la psychothérapie en explicitant sa "philosophie", c'est-à-dire les croyances qui animent ses gestes professionnels.

[Phot. d'une maquette du relief géographique construits dans la cour de l'école de Ceaucé (Orne) en 1882, phot. A. Bonnesoeur, phot. à Flers, don E. Lepetit, directeur de l'école, en 1889]

Donateur : Lepetit, E. (18..-18..? ; directeur d'école)

Modelling of weather radar echoes from anomalous propagation using a hybrid parabolic equation method and NWP model data

Contamination of weather radar echoes by anomalous propagation (anaprop) mechanisms remains a serious issue in quality control of radar precipitation estimates. Although significant progress has been made identifying clutter due to anaprop there is no unique method that solves the question of data reliability without removing genuine data. The work described here relates to the development of a software application that uses a numerical weather prediction (NWP) model to obtain the temperature, humidity and pressure fields to calculate the three dimensional structure of the atmospheric refractive index structure, from which a physically based prediction of the incidence of clutter can be made. This technique can be used in conjunction with existing methods for clutter removal by modifying parameters of detectors or filters according to the physical evidence for anomalous propagation conditions. The parabolic equation method (PEM) is a well established technique for solving the equations for beam propagation in a non-uniformly stratified atmosphere, but although intrinsically very efficient, is not sufficiently fast to be practicable for near real-time modelling of clutter over the entire area observed by a typical weather radar. We demonstrate a fast hybrid PEM technique that is capable of providing acceptable results in conjunction with a high-resolution terrain elevation model, using a standard desktop personal computer. We discuss the performance of the method and approaches for the improvement of the model profiles in the lowest levels of the troposphere.