Equivalent analysis method of electromagnetic waves propagation in semi-circular arched tunnel;

Study on the influence to the cutoff frequency of semicircle-tunnel from the train;

With the blocking idea,the watermark is embedded into the Fourier semicircle region.

The paper briefly analyzed some problems most frequently occurred in the processing and measurement of big diameter small half circle parts, and suggested some concrete solutions.

Design calculation of the semi-circled spiral in the SHE;