Based on crack face number distribution in rock mass having fractal character,a three-dimensional fractal emulation model about crack face was set up and an emulation system about crack face was developed by Visual C++6.

Based on the characteristics of lengthways veneers slicing, this paper analyses the formation of back clearance, factors influencing back clearance in lengthways slicing and properties of heating slcing thick veneers combination with the Characteristics of wood.

Based on equivalent theory and boundary condition of surface aperture and MOM,by solution of the integral equations of surface aperture electric field,an impulse antenna design of surface aperture about Ka-wave band was accomplished.