El profesor John de Bruyn, Memorial University of Newfoundland, Canada y Center for Nonlinear Dynamics, University of Texas, Austin, Texas, especialista en sistemas lejos del estado de equilibrio visitara la Argentina durante las dos primeras semanas de Diciembre/97 y realizara las siguientes actividades en el contexto del laboratorio de Sistemas Complejos del Departamento de Computacion de la FCEyN de la UBA. Se invita a todos aquellos interesados a requerir informes a:
marsh...@cnea.edu.ar o fmol...@q1.fcen.uba.ar o Seminario (en idioma Ingles) titulado Pattern formation and Hydrodynamic Instabilities (15 hours aprox.) The lectures will cover: nonlinear differential equations, stability analysis, convection (Rayleigh-Benard convection, electroconvection, natural convection), fingering instabilities (fingering at a driven contact line, printer's instability, Rayleigh-Taylor instability, Goren instability), nonequilibrium growth (electrochemical deposition). Asimismo dara una conferencia cuyo titulo y resumen se adjuntan: Electroconvection in freely suspended films of smectic liquid crystal Abstract Convective flow patterns driven by an applied electric field have been studied in freely suspended films of smectic-A liquid crystal. The films can be as few as two molecular layers in thickness. The flow pattern consists of an array of counter-rotating vortices, and appears via a supercritical bifurcation (analogous to a second order phase transition in equilibrium thermodynamics). After a general introduction to the study of pattern formation, I will present the results of experiments on the behaviour of the electroconvective flow pattern at and above the onset of convection. The results can be understood in terms of a description in terms of a universal equation for the convective amplitude. This equation can be arrived at by symmetry arguments, and can also be derived rigorously from the electrohydrodynamic equations of motion. Asimismo realizara una serie de ensayos experimentales sobre electrodeposicion en celdas delgadas y mediciones de concentracion por el metodo shadowgraph y schlieren. ----<*>-----<*>-----<*>--.N.O.T.I.A.M.C.A.--<*>-----<*>-----<*>-----<*> Los mensajes son archivados en: http://venus.unl.edu.ar/majordomo-span.html ----<*>-----<*>-----<*>-----<*>-----<*>-----<*>-----<*>-----<*>-----<*>