Using semiconductor Hall probes,we studied the local flux creep on a cylindrical melting\|textured grown YBa\-2Cu\-3O 7-δ sample at liquid nitrogen temperature and low applied field.

Comparative studies on dynamic behavior of superconducting levitation system with consideration of flux creep;

Based on Anderson's flux creep model, the counter direction hopping effect of the flux line is taken into consideration and a new general expression of irreversibility line (IL) is obtained.

Numerical calculation based on flux creep model with logarithmic barrier U showed that the dependence of ac losses Q on the amplitude of ac field Bac is still governed by Q∝Bmac, predicted by the Bean model.

Based on macro-electromagnetic constitutive relation of superconductivity: flux flow model and flux flow and creep model,numerical simulation of vibration of magnet levitated above a superconductor in superconductor-magnet levitation systems has been carried out.

A prototype of the earthworm-like micro robot based on electromagnetic creeping was designed according to the principle of the biomimtcs and manufactured using precision process technology to diagnose the colon micro-invasively or non-invasively actively,and in vitro experiments in intestine were made.