This SIS mixer receiver is reliable, and can achieve good noise performance even operated at 4.3k temperature with a close cycle helium refrigerator.
这种SIS混频接收机性能可靠，且可用闭合循环氦制冷机冷却，在4.3 K温度操作即可达到好的噪声性能。
The authors give a novel conception that in order to increase the cooling capacity of a pulse tube refrigerator at 80K temperature range, refrigerant mixtures are introduced instead of pure helium.
提出了采用合适的混合工质代替纯质氦以提高脉管制冷机在80K温区制冷量的新构思。
The disequilibrium of the enthalpy difference of helium at liquid - helium temperature region results in that the temperature distribution in the regenerator of a GM refrigerator forms a platform.
由于在液氮温区附近氦气高低压焓差不平衡，导致G-M机蓄冷器中温度分布出现低温平台。
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