On the basis of analyzing the features of soil erosion in the large area, it is displayed that the difficulties of getting the message of soil erosion in large area using computer automatic interpretation method,and it is appointed that the advantage of the man computer interactive interpretation method according.

In combination with a practical project of a pumped-storage hydropower plant, the calculated results of the axial thrust by the methods of analytical calculation and numerical calculation were compared.

Experimental results show that the proposed analytical calculation method is feasible.

The analytic calculations of 10 austenitic matrix casting alloys with different compositions agree with the experimental data of those alloys.

Considering the high accuracy,the complexity of the process and the great consumption of CPU time in digital simulation,steady state performance of the three-phase synchronous generator rectification system was analyzed,the analytic calculation to facilitate the practical application was given,the analytic calculation equations and steps were listed.

To develop an efficient beam hardening correction for medical diagnostic X-ray CT(computed tomography),an analytic calculation method was proposed to simulate polychromatic X-ray projections.

Two kinds of methods of determinating the explosion height through flight time are discussed in this paper,and one is the analytic computation and compensation method,while the other is the time partial derivative method.