Stability analysis in wave equation migration using finite element method.;

The paper established the displacemental dynamical equations of the middle-thick shells by transverse shearing deformation,based on the geometric equations,physical equations,and middle surface equilibrium equations,concerning five independent variables,i.

At first, a rotational displacement equation for geometrically nonlinear structures is derived; and then the inner forces and lateral displacements of a sway frame are calculated by the displacement equation; an example has been given for comparing the inner forces and displacements between the second-order and firs.

This paper present the accurate displacement equation of beam subject to bending distortion, the error between accurate solution and approximation solution is analyzed.

A precise formula for the phase shift is declared,and the envelope equation of the fiber-optic soliton is deduced in a distinctive form,with the unique feature of original envelope function and the mechanism of the formation of fiber-optic soliton is analyzed.

User can easily program to control clock multiplication,division and phase shift.

This paper briefly introduces the developing trend of wave equation pre-stack depth migra-tion technology, discuses p-gather wave equation velocity analysis technology, and educes the calculate formula ofcommon-azimuth wave equation pre-stack depth migration method.