A Dynamical Multi-level Scheme for the Burgers Equation: Wavelet and Hierarchical Finite Element

Algorithms issued from the NonLinear Galerkin method have been used in many situations and with different discretizations for the resolution of evolutionary nonlinear equations. The main idea of these methods is to use a splitting of the solution in order to model the equation. According to the splitting of the solution, a splitting of the equation is obtained. The modeling principle is to freeze terms which have a small time variation. In this work we use wavelet discretizations of the 2-D Burgers equations and compare the results with the hierarchical finite elements method. The numerical tests indicate that wavelets give better results than finite elements     

La conservation apprise par observation: Variations sur quelques paramètres de la démonstration du modèle.

Studied the effectiveness of imitation and comprehension processes in learning conservation by observation: specifically, the extent to which some of the verbal and social characteristics of a model's correct demonstration of conservation problems regulate the learning of the principle involved. Three experiments were conducted with 3 groups of Canadian kindergarten and 1st-grade schoolchildren, balanced by age and sex. The same male model participated in all 3 experiments; 2 female models were added in Exp III. Classical liquid conservation and/or quantification problems were solved by the model(s) in the Ss' presence. Results show that acquisition occurred by a series of cognitive processes in which the role of social pressure to conform to the model's behavior was one of the parameters evaluated. (English abstract) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Chloration anodique de liaisons insaturees en solvants nucleophiles - comportement des derives ethyleniques et acetyleniques

The anodic behaviour of ethylenic and acetylenic compounds is studied in the presence of chloride ion in polar solvents such as dmf and acetonitrile. The chlorination mechanism is discussed from voltammetric curves obtained with platinum or glassy carbon microelectrodes. The macroscale electrolyses allow the isolation of the mixed addition compounds, (eg) the chloroacetamides in acetonitrile and the chloroformates in dmf. When the anodic chlorinations of α aromatic acetylenic derivatives are carried in dmf, the electrolyses lead to chloroenol formates (2 F .mole^?1) and to dichloroketones (4 F .mole^?1) after the decomposition during the work up to unstable chloroimminium salts which are the primary intermediates of the reaction.     

Leek odor analysis by gas chromatography and identification of the most active substance for the leek moth,Acrolepiopsis assectella

When crushed, the leek,Allium porrum emits propyl propanethiosulfinate. The unstable thiosulfinate decomposes during GC analysis in numerous compounds, except on very short columns. The propyl propanethiosulfmate is the most attractive substance for the leek moth,Acrolepiopsis assectella. This thiosulfinate is not active onPlutella xylostella orPlodia interpunctella and seems to be repulsive onEphestia kuehniella.     

High index microlenses for GaAlAs laser-fibre coupling

The best compromise between coupling efficiency, accuracy of positioning and reproducibility has been obtained for a high index hemispherical lens melted on the tip of an intermediate fibre between the GaAlAs laser and the transmission fibre. The letter describes the lens fabrication technique and gives various experimental results of coupling efficiencies and mechanical tolerances.     

Confrontation Vurpillot-Gibson: Recension du Livre de Monde Visuel du Jeune Enfant par Elaine Vurpillot.

Reviews the book, The Visual World of the Child by Elaine Vurpillot (1972). By reading this work in which Vurpillot approaches, by the genetic method, the problem of the perceptive conduits of identification and differentiation, it is difficult to envision a confrontation between this new approach and that of Eleanor Gibson (1969). It is done from a point of view of comparison which the work of Vurpillot will be analyzed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)