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。
A simple and convenient method for extracting plant volatiles—condensation by liquid nitrogen;
植物挥发性物质提取的一种简易方法——液氮冷凝法
Fabrication of All-Inorganic Smart Window Device by Cooling Substrate with Liquid Nitrogen and Study on Its Performance
液氮冷却法全无机智能窗器件的制备及其性能研究
The system consists of the control unit housing the pumps and a 2 Litre dewar.
冷却系统由装有泵的控制器和2升液氮罐组成。
OPTIMAL THERMAL DESIGN OF HELIUM DEWAR WITH LIQUID NITROGEN AND BOIL-OFF HELIUM COOLED SHIELDS
具有液氮和蒸发氦气冷却屏的液氦容器的最佳热设计—能量优化法
taking-down period
(玻璃液)冷却阶段
This first segment would simply test the superconducting components, using liquid nitrogen to cool them.
第一条线路纯粹是为了测试超导体元件，以液态氮冷却。
roll coolant solutio
轧辊工作表面冷却液
gravity circulation water cooling system
温差循环液冷却系统
engine coolant heater
发动机冷却液加温器
liquid metal cooled reactor
液态金属冷却反应堆
natural circulation type cooling system
自然循环液冷却系统
coolant thermometer
（发动机）冷却液温度表
corrosion inhibitors for engine coolant
发动机冷却液防锈剂
tee coolant flow
通过三通管的冷却液流
thermo-siphon circulation type cooling system
热流循环液冷却系统
Previously investigators used lead-salt lasers, which require liquid-nitrogen cooling and thus are impractical in the field.
以往研究人员使用的铅盐雷射必须以液态氮冷却，因此不适合在实地使用。
Also, an attacker could cool the black shroud of the warhead using liquid nitrogen, making it invisible to the kill vehicle's infrared sensor.
另外，攻击者也可利用液态氮冷却弹头的黑色外壳，以躲避击杀载具上红外线感测器的追踪。
The other remaining problem is that the refrigeration technology needed to keep the superconducting cable supplied with liquid nitrogen is not really ready for commercial use.
另一个尚未解决的问题是：通过液氮保持电缆超导性的冷却技术还不适用于商业用途。
The Simulation of Cooling and Freezing Characteristics by Using Spraying Liquid Nitrogen in the Cold Storage Vehicle;
液氮冷藏车喷淋冷冻冷藏性能模拟分析