2-D homogenization method was applied to study the effects of the micro-structure(cell shape and size)on the equivalent elastic constants of porous structures so as to simplified the problem.

To verify the correction of these equivalent elastic constants,linear static analysis of an aluminum sandwich plate under pressure out of panel was performed with NASTRAN program.

For the purpose of the structural application of fiber-reinforced plasterboard filled with concrete(composite wall-board)in tall building,one wallboard type was selected and the method of materials mechanics was used to simplify it to orthotropic board and equivalent elastic constants were obtained.

One of fundamental studies in microwave chemistry is to measure effective permittivity of chemical reaction precisely.

According to the analogy concept of series-parallel connection of the capacitance, the approximate formulae of effective permittivity along x,y,z direction for various inhomogeneous unit grids are deduced.

The effective permittivity of the mixture with carbon volume content 1% was calculated by the strong fluctuation theory combining with Maxwell-Wagner theory;and the EM wave absorbing property of a laminated model filled with carbon coated EPS beads was predicted through calculation.

Research on the model of multilayed multiconductor system with equivalent permittivity;

A concept of equivalent permittivity for the planar structure of printed circuit board (PCB) was presented.

It is pointed out that the equivalent permeability and permittivity of honeycomb-structured absorbing materials are smaller than those of the absorbing layer,but the equivalent permittivity is reduced more significantly,so the equivalent permeability is more close to the equivalent permittivity.

The result indicates that under a balanced state the process of coprecipitation flotation can be regarded as a one grade reaction under the best isolation rate, where the equivalent speed constant is k=0.