One class of white dwarfs has almost pure helium atmospheres.
有一类白矮星的大气层几乎完全由纯氦气构成。
As the normal suppression method, pure helium is gradually replaced with He-Ar mixed gas for economical efficiency, especially the he content is more than 50%.
常用的抑制方法是侧吹氦气，而采用氦氩混合气体可降低生产成本，特别是当氦气含量高于50%时。
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。
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