Cold trap using liquid nitrogen to achieve a constant input of rapid cooling, so that rapid nucleation of steam to ensure that the nanometer scale.
冷阱采用了不断输入液氮实现了急速冷却，使蒸汽快速成核以保证纳米尺度。
A novel contact cooling method suitable for the vitrified cryopreservation of skin is proposed and comparison is made with the cooling method using liquid nitrogen.
提出一种适用于皮肤低温保存的快速冷却方法，并与目前使用的快速冷却方法进行了比较。
Without cooling the gain medium in liquid nitrogen or using gratings and complex, expensive devices, this fiber laser has the advantages of being simple and easily attainable at a low cost.
这种装置无需将增益介质放在液氮中，也不需要多个光栅选频或其他复杂而昂贵的器件，具有结构简单，易实现和成本低等优点。
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