2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/15703The slow passage through a Hopf bifurcation leads to the delayed appearance of large amplitude oscillations. We construct a smooth scalar feedback control which suppresses the delay and causes the system to follow a stable equilibrium branch. This feature can be used to detect in time the loss of stability of an ageing device. As a by-product, we obtain results on the slow passage through a bifurcation with double zero eigenvalue, described by a singularly perturbed cubic Lienard equation.25 pages, 4 figuresChaotic DynamicsOptimization and Controltext