Based on Biot's theory and the theory of generalized characteristics,the bifurcation on the slow-wave fronts in anisotopric fluid-saturated porous materials is studied.

The test result shows that not only the spreading process of burning wave front can be seen clearly but also the combustion velocity of delay explosive can be reckoned by using high-speed digital camera technology.

Some wave phenomena (Huyghen,influence domain,delay potential,wave front)have been explained by mathematic analysis of the equations of wave motion.

A weakly-compressible two-dimensional axisymmetric isentropic vortex model is employed to stimulate interactions between single vortex and single optical wavefront.

Use Wavefront Extend the Depth-of-Field of the Iris Capture System;

Based on the concept that there is a π phase jump property in the boundary wave, the diffraction of the plane wave and the spherical wave through an aperture is analyzed by means of wavefront diagram.