This paper is devoted to the study of multiple 2π -periodic solutions for Duffing equations x′ ′ + cx′ + g(t,x) = s(1+h(t)) under the condition of nonuniform non-resonance related to the positive ...

In this paper, with the use of the homotopy method, a constructive proof of the Poincare-Birkhoff theorem is given. This approach provides a global method for finding fixed points of area-preserving ...

Scientists have utilized a device based on the Duffing oscillator to solve the problem of PV systems’ low efficiency at low input voltages at dawn and sunset. Its performance was reportedly better ...

The conditions for a system to exhibit stochastic resonance are well known and fairly robust. First among these is an energy threshold. Second, there needs to be an applied subthreshold modulation, ...