To put forward some new designing ideas about the vacuum drawing and filtering system,and to introduce the technological process,the structure of the drawing and filtering container and its working principle.

Physics Design and Experimental Study of Tokamak Divertor;

Divertor biased voltage in the HL-2A tokamak may decrease the threshold power of L-H transition,increase the density,pressure and retention time of divertor plasma.

In order to minish the power consumption and the area of A/D converter,the structure of digital decimation filter in Δ-ΣA/D converters is designed by analyzing its principle.

An approach for designing digital-intermediate frequency(IF) receiver is introduced,the principle analysis and deduction of all parts of the receiver are performed including design of available-band filter,Analog-to-Digital Converter(ADC),digital orthogonal transforms based on digital polyphase filter,decimation filter,baseband signal processing unit.

This paper introduces the principle and structure of decimation filter in software radio, analyzes and compares the performances of various decimation filters, and finally, discusses the optimal realization in FPGA.