1) helium-displacement method
氦置换法
2) helium replacement method
氦气替换法
1.
Discussion on the principle and measurement of helium replacement method for testing true relative density
氦气替换法测定煤真相对密度的原理与测试
3) helium method
氦法
4) displacement method
置换法
1.
In this article, hydrogen is adopted to displace the ideal gas in the experiment of "measuring the Molar gas constant R by displacement method" and a corresponding calculator program is designed.
围绕以氢气替代理想气体采用“置换法测定摩尔气体常数R”的实验,设计了相应的计算程序,并通过学生的实验数据验证该程序的可行性和可靠性。
2.
A new microscale experimental plan for determination of molar gas constant by displacement method had been presented.
提出了“置换法测定摩尔气体常数”的一个新微型实验方案 ,其实验规模缩小为常规实验的约 1 /1 0 。
3.
Via introducing of F-ions,a kind of core-shell Fe/Al nanocomposite had been prepared by displacement method,in which the micron Al grain were coated in a lay of nanometer Fe particles.
采用置换法,通过在溶液中引入F-离子,实现了弱酸性条件下Fe纳米粒子在微米Al粉表面定量、快速地化学沉积,制备出具有核壳结构的Fe/Al微纳米复合粒子。
5) water replacement
水置换法
1.
According to the current technical level and the concrete situation of the storage/distribution station,this paper puts forward three schemes for the replacement of the natural gas in the spherical tank(inert gas replacement,water replacement and gas direct replacement),and through comparison of these schemes,holds that the gas direct replacement is more convenient and economic.
根据目前的技术水平和储配站的具体情况,提出了3种天然气球罐置换方案(惰性气体置换法、水置换法、燃气直接置换法),经过方案比较,认为天然气直接置换较为方便、经济。
6) Replacement method
置换方法
1.
Replacement methods of the process system were introduced briefly in new LPG supply station, before put it into operation.
简单介绍新安装的液化石油气站投入使用前工艺系统的置换方法,具体论述各置换方法的原理以及安全措施和实用性,通过对照比较,选择安全经济的置换方法,来保证液化石油气站工艺装置置换时的安全工作,使工艺装置正常投入运行。
补充资料：氦3-氦4稀释制冷
分子式：
CAS号：
性质：3He-4He混合液在0.867K时出现界限分明的上下两相，上相3He含量高称浓相，下相4He含量高称稀相。稀相中4He的熵比3He的熵小得多，浓相中4He的熵又比稀相中3He的熵小得多。3He从浓相进入稀相或从稀相中抽走都会发生降温。用泵把3He-4He混合室与一个蒸发器和一个冷凝器连接起来就组成稀释制冷器。用抽气泵不断地把蒸发器中的3He抽走，蒸发过程中3He带走大量热量。从蒸发器中抽走的3He经冷凝器液化后再回到混合室。用此法可获得0.0035～0.0055K的超低温。
CAS号：
性质：3He-4He混合液在0.867K时出现界限分明的上下两相，上相3He含量高称浓相，下相4He含量高称稀相。稀相中4He的熵比3He的熵小得多，浓相中4He的熵又比稀相中3He的熵小得多。3He从浓相进入稀相或从稀相中抽走都会发生降温。用泵把3He-4He混合室与一个蒸发器和一个冷凝器连接起来就组成稀释制冷器。用抽气泵不断地把蒸发器中的3He抽走，蒸发过程中3He带走大量热量。从蒸发器中抽走的3He经冷凝器液化后再回到混合室。用此法可获得0.0035～0.0055K的超低温。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条