2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/27189A theoretical explanation of giant conductance oscillations observed in normal mesoscopic rings with superconducting ``mirrors" is proposed. The effect is due to resonant tuning of Andreev levels to the Fermi level, which enhances the transparency of the system to the normal current. The mechanism is demonstrated for a one-dimensional model system.10 pages, RevTeX, 3 fig. available upon request, Appl. Phys. Report 94-6Condensed Mattertext