2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/56258We review open descendants of non-supersymmetric type IIB asymmetric orbifolds with zero cosmological constant. We find that supersymmetry remains unbroken on the branes at all mass levels, whereas it is broken in the bulk.4 pages, Latex, uses cargese.cls, proceedings of Cargese Summer School on "Progress in String Theory and M theory"High Energy Physics - Theorytext