A new construction on mutually orthogonalfrequency squares;

The frequency equation of RF MEMS switches was derived by separation of variable.

Based on theoretical analysis of stepped bending vibration boring bars,the frequency equation of a stepped bending vibration boring bar with circular and square sections is established.

In this paper,tubular vibrator with coupled longitudinal and radial vibration is studied,and the frequency equation of tubular vibrator derived.

During the research of a representative type of bistatic SAR imaging theory,the error formula of azimuth resolution was deduced to express the effect of differences between Doppler frequency and azimuth frequency,the error formula was extended to monostatic SAR.

This paper compared the Doppler frequency and azimuth frequency in detail during the researching of a representative bistatic SAR imaging theory and found that using Doppler frequency instead of azimuth frequency in the general SAR processing with traditional imaging algorithms has little influence on the azimuth resolution of the fine imaging,the error is less than 4%.

<Abstrcat>From molecular beam s speed distribution function,molecular beam s frequency distribution function is deduced,and calculates mean frequency,root-mean-square frequency and most possible frequency are calculated,and compared with corresponding characteristic quantities of speed distribution function one by one,and their physical significance are explaned.