liquid nitrogen two-phase flow refrigerator是什么意思

用法例句

A series of Er 3+ /Yb 3+ co-doped BaF_2 powders with the same compositions were prepared at different sintering temperatures, and the samples were cooled by liquid-nitrogen refrigerating and air-cooling, respectively.

采用液氮制冷和空冷两种冷却方式制备了不同烧结温度的系列相同配方Er3+/Yb3+共掺杂BaF2粉末。

Based on this, a liquid nitrogen cooled screen device is developed to control the radiation degradation of deuterium lamp.

在此基础上,研制了液氮制冷屏装置来抑制氘灯衰减。