纯氦

石墨在高纯氦中的高温氧化研究

Investigation of the oxidation of graphite in high purity helium atmosphere

实验结果表明，热声驱动脉管制冷机采用适当配比的氦氩工质可获得比纯氦更加优越的制冷性能。

The experimental results indicated that the refrigeration performance with appropriate He ~ Ar mixtures was better than that of pure He .

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 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 .

一些白矮星的大气中几乎只有纯氢或氦，但这颗星的大气中重元素碳的含量异常高。

Some white dwarves4 have almost pure hydrogen or helium atmospheres , but this star has an atmosphere unusually high in the heavier element , carbon .

例如，在原子能和半导体工业中所需的高纯气体氩、氦及半导体材料硅和锗等，其纯度都要求在99.99%，有些甚至超过99.9999%。

For example , in the industries of atomic energy and semiconductor , the purity of argon , helium , silicon , and germanium is 99.99 % , some of them even exceeds 99 . 9999 % .