Time-delayed feedback control of coherence resonance near subcritical   Hopf bifurcation: theory versus experiment
  Using the model of a generalized Van der Pol oscillator in the regime of subcritical Hopf bifurcation we investigate the influence of time delay on noise-induced oscillations. It is shown that for appropriate choices of time delay either suppression or enhancement of coherence resonance can de achieved. Analytical calculations are combined with numerical simulations and experiments on an electronic circuit. 
V. Semenov, A. Feoktistov, T. Vadivasova, E. Sch\"oll, and A.   Zakharova
nlin.CD nlin.AO