We observe a resonance behavior of oscillations prior to Hopf bifurcations in an autonomous system. The system studied is a barium sodium niobate crystal in which voltage oscillations are induced by a periodically modulated current density. The resonance behavior is measured as a function of the dc-offset current density. The shape of the resonance peak and its dependence on the dc offset are found to be in fair quantitative agreement with recent theoretical studies.
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Martin et al. (1986) studied this question.
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