  The behavior of the dc-component of the current along a quantum loop of
tight-binding electrons threaded by a magnetic flux that varies linearly in
time Phi_M(t)= Phi t is investigated. We analize the electron transport in
different kinds of one-dimensional structures bended into a ring geometry: a
clean one-dimensional metal, a chain with a two-band structure and a disordered
chain. Inelastic scattering events are introduced through the coupling to a
particle reservoir. We use a theoretical treatment based in
Baym-Kadanoff-Keldysh non-equilibrium Green functions, which allows us to solve
the problem exactly.
