The tomographic inversion is transformed to resolving respectively a series of single equation in light of backprojection principle,each equation corresponding to a Fresnel zone.

But in fact, the frequency of seismic wave is finite and most of the energy travels along the shortest path within its Fresnel zone.

Rytov variance and propagation Fresnel number have still effect on Strehl.

Ascertain model nether boundary problem in physical and numerical simulation of strata movement;

Determination of left and right boundary lines for numerical simulation model of mining process;

The searching method of boundary in optimization with integralization;

Inside Network Border Security and Analysis of LogFiles;

Border and Surmounting——Discuss the elite art and the masses art too;

The Border Study between Government and Non-profit Organization;