2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/200824We study orbifold compactifications of the type IIB superstring on AdS_5 x S^5/Gamma, where Gamma is the abelian group Z_8, which can lead to non-SUSY three and four family models based on quartification. In particular, we focus on two models, one fully quartified model and one a model with two trinification families and one quartification family, which reduces to the standard model with a minimal leptonic color sector.12 pages, 2 figuresHigh Energy Physics - Phenomenologytext