On Vanishing dissipative-dispersive perturbations of hyperbolic conservation laws

In presence of linear diffusion and non-positive dispersion, we prove well-posedness of the nonlinear conservation equation u_t+f(u)_x=\eps u_xx -\del((u_xx)^2)_x. Then, as the right-hand perturbations vanish, we prove convergence of the previous solutions to the entropy weak solution of the hyperbolic conservation law u_t+f(u)_x=0

Posibilidades de la función consultiva de la Corte: balance y perspectivas

La Corte Internacional de Justicia ocupa una plaza única en el edificio orgánico y funcional erigido por la Carta de las Naciones Unidas para el reglamento pacífico de los diferendos y el mantenimiento de la paz. Plenamente integrada a la Organización y alimentada por las preocupaciones y los objetivos de la misma, la Corte aparece como teniendo la "responsabilidad principal" de la solución de diferendos de orden jurídico. Pero cuando se evoca la contribución de la Corte a la solución pacífica de diferendos y al mantenimiento de la paz, se piensa generalmente en el ejercicio de su función contenciosa. En cambio, se hace mucho menos referencia a la función consultiva de la Corte

H infinity observer for time-delay systems. Application to FDI for irrigation canals

This paper deals with the problem of fault detection and isolation for time-varying delayed systems. It consists to develop a $H_{\infty}$ observer that generates residuals sensitive to some faults and insensitive to others in order to detect and isolate actuator faults which can occur on the regulation gates of an irrigation canal. The observer design uses a simplified approximate model of the Saint-Venant equations and is formulated with delay-dependent Linear Matrix Inequality (LMI). Simulations done with a realistic model of a real canal show the effectiveness of the metho

Mi lectura de antiguo colonizado de la obra de Francisco de Vitoria

Nombrado Doctor Honoris Causa el día 27 de enero de 200

Soudage de deux métaux dissimilaires (Al/Cu)

This doctoral thesis was carried out as part of a WBI scientific collaboration project between the University of Biskra directed by Pr. Zakaria BOUMERZOUG and the University of Mons in Belgium directed by Pr. Fabienne DELAUNOIS. The aim of this investigation is to study the effect of time and temperature on the solid state diffusion welding of commercial aluminum alloy 2xxx series with a pure copper at 450°C, 475 °C, 500°C, and 525°C during holding times from 15 min to 240 min and to propose optimal welding temperature and holding time that permit to obtain a sound joint (defects-free and exhibiting a minimum IMCs). The main characterization techniques were optical microscopy, scanning electron microscopy, energy dispersive spectrometry, nanoindentation, microhardness measurements, and X-ray diffraction. Results showed that increasing the temperature and the holding time had an effect on the apparition of the intermetallics at the Al alloy/Cu interface. Five intermetallic phases namely Al2Cu, AlCu, Al3Cu4, Al2Cu3 and Al4Cu9 were identified at the interface. The micromechanical properties of the welded joint Al/Cu alloy varied also with the time and temperature. The nanoindentation measurements showed that the highest values of hardness were recorded in AlCu and Al3Cu4 phases. The optimal welding parameters that permitted to obtain a sound joint were: T=500°C and t=15min

Le texte au carrefour des disciplines

Cet article se veut une approche dite pluridisciplinaire de ce qu’on appelle dans la littérature linguistique «le texte». Il s’agit donc de mettre en exergue les différentes stratégies méthodologiques des théories textuelles et discursives. Pour ce faire, nous avons essayé d’expliquer comment le choix de l’objet de recherche influence le choix d’une approche au dépens d’une autre.