WT5”BZ]To deal with the problems of shore boundary, moving boundary and engineering boundary which appear frequently in the 2D tidal current simulation by the finite difference method, the concept of line boundary is introduced and studied here, then the line boundary technique in rather common use is proposed.

Aiming at the characteristics of low head and large discharge of power station of bulb tubular type turbine,the station unit s boundary equations and the boundary equations between draft tube outlet and downstream channel inlet are established in this paper.

Through the study of orbital excursions we obtain Local times ,Excursion measure, Boundary process of bilateral birth and death process with emplastic boundary, the situation of satisfyi.

According to the phase matching and the boundary equations,theoretical expressions of the reflections and the refractions at interface between sequential uniaxial crystals are obtained as the orientations of optical axes are arbitrary.

Taking notice to the difference of directions between the e wave normal and the e ray and the difference of refractive index between the e wave normal and the e ray,reflection and refraction of a beam incidence from an isotropic medium upon a crystal are studied,and the boundary equations are deduced.

Study on method of earthquake input and artificial boundary conditions for seismic soil-structure interaction analysis;

Effect of vertical artificial boundary on seismic response of soil layer under traveling wave excitations;

In the mathematic modeling of the seismic response of a tunnel,the lateral calculation range and artificial boundary have great influence on the result of calculation.