Cooling field dependence of exchange anisetropy Was investigated in ferromagnetic(FM)/antiferromagnetic(AFM) bilayers with antiferromngnetle interface coupling. It shows that the exchange bias H_E Can change from negative to positive with increasing cooling field H_CF and cooreivity H_C acquires a maximum near crossover of H_E.Especially.effect of FM and AFM thickness on exchange anisotropy is discussed in detail.Both negative(or positive)H_E and H_C always decrease with increasing of FM thickness t_FM,which shows good agreement with experimental observation.It demonstrates interfacial nature of the exchange anisotropy.However,AFM thickness t_AFM dependence of exchange anisotropy is relatively complex.In the case of positive H_E,with increasing of t_FM,H_E increases and H_c decreases.But。in the valse of negative H_E,H_E decreases and H_C increases with increasing t_AFM.

A numerical method for simulation of interfacial flows with phase change is presented. A volume-of-fluid (VOF) method based on piecewise linear interface construction (PLIC) is used to track interface. Spocial treatment is taken to deal with discontinuous velocity field due to phase change at liquid-vapor interface. The treatment is easy and effective. SIMPLE method is used for flow field and a CSF model for surface tension. The method is used to simulate three-dimensional film boiling on a horizontal plate with Cartesian coordinates and axisymmetric two-dimensional natural convection film boiling on a hemisphericallyended rod with body fitted coordinates. They are in good agreement with analytical correlations.

Based on integrated description of simulation of dynamic reliability system, algorithms of direct simulation, analog simulation, forced transmit, direct statistical extimation, weighted statistical estimation are given.Reliability of a non markov Con/k/n:F system is calculated by these five Monte Carlo methods.Results show that weighted statistical estimation method has highest efficiency.