2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/27634We examine the effects of disorder in one-dimensional systems. We link the case of a few impurities, typical of a short quantum wire, to that of a finite density of scatterers more appropriate for a long wire or a macroscopic system. Finally we investigate the effects of long-range interactions on the transport in 1D systems. We predict in that case a conductivity behaving as $σ(T) \sim T^2$.}12 pages, 4figures, uses epsfig. Proceedings of the XXXIst Moriond meeting (January 1996) ``Correlated Fermions and Transport in Mesoscopic Systems''Condensed Mattertext