In this paper,a new method for the determination of fatigue limit of material using the non-propagation behaviors of crack is presented based on the analysis of propagation condition of microstructural short fatigue crack,which consider the effect of grain orientation on efficient driver of.

The authors determine elliptically polarized parameter of sinusoidal dielectric subwavelength gratings with ellipsometry theory and extended boundary condition method.

Based on the scattering from the rough conducting fractal surface with the use of extended boundary condition method,this method is extended to the case of electromagnetic scattering from the rough dielectric fractal sea surface.

The authors present a parameter correction process applied to extended boundary condition method (EBCM) in order to make it valid in the deeper groove gratings.

This paper investigates the automatic target recognition(ATR) evaluation problem,where the ATR performance and system cost are restricted by each other in the extended operation condition(EOC).

The macroscopic conditions for the formation of hail clouds are discussed through analyzing the patterns, thermal and hygrometric stratification conditions and local features of mesoscale influencing systems occurred in severe hail days from 1980 to 2000 in the Beijing area.