2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/82595The changes of hadron properties in dense and/or hot matter are discussed in terms of effective chiral Lagrangians with the parameters of the theory scaled in a simple way. The phenomenologically successful Walecka model is identified as a mean field chiral Lagrangian with the scaled parameters. Kaon condensation and chiral restoration transitions can be described within the same mean field framework.14 pages, LATEX, 3 figures uuencoded; invited talk at INPC'95, Beijing, China; SNUTP-95-081Nuclear TheoryHigh Energy Physics - Phenomenologytext