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美国华盛顿海军研究实验室,改进了一种氦液化器。这种氦液化器是为超导发动机和发电机(为舰船提供动力)提供冷源。改进后的氦液化器的效率比原来的氦液化器高
US Naval Research Laboratory in Washington, USA, improved a helium liquefier. This helium liquefier provides a source of cooling for superconducting engines and generators that power the ship. The improved helium liquefier is more efficient than the original helium liquefier