说明： We outline two interesting phenomena, stochastic resonance and ratchets, in which the uctuating environment is utilized. Some new manifestations of these phenomena are illustrated by the example of overdamped driven pendulum with uctuating internal <niu9818> 上传 | 大小：80kb
说明： We consider the escape of the particles over fluctuating potential barrier for a system only driven by a multi-state noise. It is shown that, the noise can make the particles escape over the fluctuating potential barrier in some circumstances; but i <niu9818> 上传 | 大小：281kb
说明： The ratchet motion of a Brownian particle in a symmetric periodic potential under a rocking force that breaks the temporal symmetry is studied. As long as the relaxation time in the thermal background is much shorter than the forcing period, the uni <niu9818> 上传 | 大小：227kb
说明： The periodic effective potential of a superconducting quantum interference device containing an underdamped Josephson junction in the first branch and a double-barrier junction in the second is studied. An effective non-sinusoidal expression for the <niu9818> 上传 | 大小：281kb
