2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/93773In order to give some insight into a role of small impurities on the electron motion in microscopic devices, we examine from a general viewpoint, the effect of small obstacles on a particle motion at low energy inside microscopic bounded regions. It will be shown that the obstacles disturb the electron motion only if they are weakly attractive.LaTeX 5 Pages, Talk presented at The 1998 International technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC'98), Sokcho, Korea, July 13-15, 1998Quantum PhysicsChaotic DynamicsCondensed MatterNuclear Theorytext