A new algorithm-particle swarm optimization (PSO), based on swarm intelligence, is applied to data processing of film parameters by ellipsometry. For a monolayer absorption film, reflective index, extinction coefficient and film thickness are obtained simultaneously by PSO. Even if the range of parameters is unknown, optimal solution can be obtained rapidly with search in a wide range. Compared with ellipsometry processing and genetic algorithm, the method exhibits high computational precision and high convergence speed.

A fractal model of coarse surface of SiC by using structure function is presented.Three parameters rms roughness Δ,fractal dimension D,and correlative length L are used to describe the covariance function of surface height.The method calculating these parameters is also given.With the present model,one can calculate the coarse dispersion of SiC/SiO₂ fractal interface to channel electrons.

A hybrid method which collects the advantages of both iterative method and optimization method is introduced.This method is adopted in designing the diffractive optical device used in target illumination of ICF system,and better design results are obtained.The diffractive efficiency is up to 97.5%,the mean square error is 0.026 and the focal plane profile has an perfectly flat top.

An updated version of level set method without reinitializing step is designed to simulate the motion of a small volume of gas rising up to and bursting at an initially horizontal free surface. Accompanying topological changes of the gas-liquid interface, such features of the series of rotational motion as cavity, upward-jet, viscous-gravity-capillary waves along the merged interface are captured in the numerical examples. In some cases, smaller volumes of liquid may break off the jet at certain stage. In others, the free surface may roll up. In the tests, Reynolds number, Weber number, and gravitational acceleration are allowed to vary in wide ranges.