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Ａｔｐｒｅｓｅｎｔ,Ｂｉ(2 2 2 3) /Ａｇｍｕｌｔｉｆｉｌａｍｅｎｔａｒｙｓｕｐｅｒ ｃｏｎｄｕｃｔｉｎｇｔａｐｅｓａｒｅｃｏｎｓｉｄｅｒｅｄｔｈｅｍｏｓｔｓｕｉｔａｂｌｅｈｉｇｈｔｅｍｐｅｒａｔｕｒｅｓｕｐｅｒｃｏｎｄｕｃｔｏｒｓ (ＨＴＳ)ｔｏｂｅａｐｐｌｉｅｄｔｏｓｕ ｐｅｒｃｏｎｄｕｃｔｉｎｇｍａｇｎｅｔｉｃｅｎｅｒｇｙｓｔｏｒａｇｅ(ＳＭＥＳ) ,ｓｕｐｅｒ ｃｏｎｄｕｃｔｉｎｇｍａｇｎｅｔｓ,ｓｕｐｅｒｃｏｎｄｕｃｔｉｎｇｆａｕｌｔｃｕｒｒｅｎｔｌｉｍ ｉｔｅｒｓａｎｄｃｕｒｒｅｎｔｌｅａｄｓ,ｅｔ… 相似文献
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针对直流变频自由拖5 HP外机进行实验,以四台低静压风管机室内机为实验对象,在各种恶劣工况条件下研究润滑油变化时,系统应采取何种相应控制手段,并从系统控制方面进行精细的设计,确保直流变频压缩机润滑油的可靠性。 相似文献
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It‘s importat that HTS tapes have lower thermal conductivity and higher transversal resistivity in order to reduce the heat leaks conducted along the tapes and AC losses in the high temperature superconducting system conduction-cooled by GM coolers,This paper presents an experimental investigation into the effects of pure Ag and AgAu alloys sheath materials on the properties of Bi(2223) multifilamentary tapes and the optimisation of conduction-cooled hybrid current leads made from copper and Bi(2223)/Ag or Bi(2223/)AgAu tapes,The thermal conductivity of the tapes were measured by cryogenic steady healt flux method and the resistance was measured by using standard DC four-probe method at lo temperature,The results showed that the reduction of thermal conductivity by the addition of Au into the sheath material of Bi(2223) tapes was 65%,75% and 85% lower than that of pure Ag sheathed Bi(2223) tapes and the increase of resistivity was 4.9,10 and 19.4 times higher than that of pure Ag for the addition of 2.2%,5.7% and 10.7% Au(atom ratio )respectively.And the study also attempts to optimise thermodynamically the conduction-cooled hybrid current lead by using a devel-oped model ,which took the irrevesibility of commercial GM coolers,the contact resistance and thermal conductance into account,Predictions from the model showed that AgAu alloys were suitable candiate materials to replace Ag as sheath material of Bi(2223) tapes applied in THS current leads,In addition,Bi(2223)/AgAu was a suitable material to be applied as the THS section of hybrid current leads in conduction-coled superconducting electric systems. 相似文献
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为上海某测试中心发动机测试台设计了一套带数码涡旋压缩机的空调系统,通过一系列设计,实现了该空调系统在超低温度和湿度条件下的高精度恒温恒湿控制。 相似文献
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高精度恒温恒湿空调系统应用于对环境有严格控制的地方,而数码涡旋压缩机技术具有无极能量调节、室内温度控制更准确的特点．将数码涡旋压缩机技术应用于高精度恒温恒湿空调系统,实现该空调系统在超低温度和湿度条件下的高精度恒温恒湿控制,达到温度±0．5℃和相对湿度±1％的精度要求。 相似文献
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