Thomas Giraud, Avec Bas Jan Ader

Analysis of ADER and ADER-WAF schemes

We study stability properties and truncation errors of the finite-volume ADER schemes on structured meshes as applied to the linear advection equation with constant coefficients in one-, twoand threespatial dimensions. Stability of linear ADER schemes is analysed by means of the von Neumann method. For nonlinear schemes, we deduce the stability region from numerical experiments. The truncation ...

Thomas Luhmann , Stuart Robson , Stephen Kyle and Jan Boehm

Yann Giraud Duke 2008 _version 3_

In this paper, I analyze the changes affecting modern economics textbooks such as Samuelson’s Economics, within the broader context of the American visual culture as inherited from the interwar period. The new tools and Medias depicting and disseminating social information to a mass audience were heavily used as means of education during wartime. When economic departments all over the US were c...

∗ Jan

We formulate a complete path integral bosonization procedure for any fermionic theory in two dimensions. The classical action of the bosons in the bosonized theory is −i times the logarithm of the Jacobian of a local chiral transformation, with the boson fields as transformation parameters. Three examples, the Schwinger model, the massive Thirring model and massive non-Abelian bosonization, are...

Codage de la parole a bas et tres bas debits

This paper reviews the main algorithms for speech coding at low and very low bit rates, from 50 bps to 4000 bps. Then the HSX technique for coding at 1200 bps and a new segmental method with automatically derived units for very low bit rate coding are presented in details.