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An experimental model of a Duffing oscillator is presented. It consists of a linear inductance, a resistance and a nonlinear ferroelectric capacitance. A computer-controlled measuring system recorded quantitatively the phase portrait of this series-resonance circuit. The comparison of experimentally observed phase portraits with those calculated by a computer allows one to check different assumptions about the nature of the nonlinear properties.
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Beige et al. (1992) studied this question.
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