Three Gorges Project (TGP),the largest water resources and hydropower project in the world with huge scale and complex techniques,has great comprehensive benefits mainly in flood control,power generation and navigatio...Three Gorges Project (TGP),the largest water resources and hydropower project in the world with huge scale and complex techniques,has great comprehensive benefits mainly in flood control,power generation and navigation improvement.Through 17-year construction and practice,the project has been successfully completed.Some valuable experience from the successful construction of TGP has been gained for the management system and mechanism of hydropower project construction in China.Its construction management mode produces important influences on the management system of domestic capital construction.With combination of the construction management practice of TGP,the characteristics of management system and mechanism are summarized,and the suggestions on current hydropower development system and construction management mode are put forward.展开更多
A valveless linear compressor was built up to drive a self-made two-stage pulse tube cryocooler. With a designed maximum swept volume of 60 cm3, the compressor can provide the cryocooler with a pressure volume (PV) po...A valveless linear compressor was built up to drive a self-made two-stage pulse tube cryocooler. With a designed maximum swept volume of 60 cm3, the compressor can provide the cryocooler with a pressure volume (PV) power of 400 W. Preliminary measurements of the compressor indicated that both an efficiency of 35%~55% and a pressure ratio of 1.3~1.4 could be obtained. The two-stage pulse tube cryocooler driven by this compressor achieved the lowest temperature of 14.2 K.展开更多
文摘Three Gorges Project (TGP),the largest water resources and hydropower project in the world with huge scale and complex techniques,has great comprehensive benefits mainly in flood control,power generation and navigation improvement.Through 17-year construction and practice,the project has been successfully completed.Some valuable experience from the successful construction of TGP has been gained for the management system and mechanism of hydropower project construction in China.Its construction management mode produces important influences on the management system of domestic capital construction.With combination of the construction management practice of TGP,the characteristics of management system and mechanism are summarized,and the suggestions on current hydropower development system and construction management mode are put forward.
文摘A valveless linear compressor was built up to drive a self-made two-stage pulse tube cryocooler. With a designed maximum swept volume of 60 cm3, the compressor can provide the cryocooler with a pressure volume (PV) power of 400 W. Preliminary measurements of the compressor indicated that both an efficiency of 35%~55% and a pressure ratio of 1.3~1.4 could be obtained. The two-stage pulse tube cryocooler driven by this compressor achieved the lowest temperature of 14.2 K.