According to performance-based seismic design theory,six specimens of high performance concrete shear wall with boundary columns and several high strength rings like a chain along boundary element in the potential plastic region were designed and the quasi-static tests were carried out.

Study on numerical simulation of underwater launch for end-burning grain solid motor with embedded wire;

To investigate the law of burning-rate and the feasibility of application in unchecked sold ducted rocket,the performances of end-burning grain gas generator embedded with silver-wire were calculated by zero dimension interior ballistics computer program.

Copper insprt used in terminal post, lead-tin and flux used in copper insert submerged and post alloy were discussed.

The major reasons for terminal post corrosion of valve regulated lead-acid batteries are explained.