A mathematical model of liquid nitrogen system of a space environmental simulator is introduced and a quasi-stationary control method is developed in this paper.
大型空间环境模拟器的液氮系统庞大复杂，为满足确定控制方案、建立故障诊断模型、技术改造等的需要，建立液氮系统的数学模型是十分必要的。
It has been proved by test that the problem of large space simulator liquid nitrogen system starting has been solved successfully in simulator liquid nitrogen system.
通过初步调试证明，液氮系统能够很好地解决大型空间环境模拟设备液氮系统启动困难的问题。
According to the theory of similitude, a Liquid Nitrogen Freezing(LNF)model testing system for soil under water flowing at a great rate is established for the first time.
根据相似理论，首次建立了模拟大流水条件下土层液氮冻结的试验系统。
In these applications, it is very crucial to predict the flow boiling heat transfer coefficient of liquid nitrogen for the system design and safe operation.
在这些应用中，准确预测液氮的流动沸腾换热特性对于系统设计和安全运行十分重要。
This paper briefly introduces the realization of automatic monitoring alarm system in NMR water-cooled machine in our hospital, by which we can reduce the damage and prevent liquid nitrogen lost.
简要介绍了我院水冷机自动监控报警系统的实现过程，通过水冷机的监测并以短信的方式通知维修人员迅速赶到现场处理故障，减少液氦的损失，防止失超。
The paper describes an apparatus, bolometer and system for measuring the specific heat of small samples above liquid nitrogen temperature using relaxation calorimetry.
本文介绍一种用弛豫方法测量液氮温度以上小样品比热的装置、微型量热器和测量系统。
In the paper, a traditional setting of measuring TSC is improved by ameliorating sample room and assembling liquid nitrogen cooled system, which can analyze exactly sample in detail.
本文通过改进样品室、增加液氮冷却系统，对传统热激电流测量装置进行了完善，使其能对样品进行更详细地分析。
The YDLY Cryosurgery Unit is a large movable liquid nitrogen cryosurgery system for more applications.
YDLY型液氮冷冻医疗机系通用型的大型可移动式冷冻医疗装置。
Liquid nitrogen is adopted as protective atmosphere in bell type furnace for which vacuum pumping system are provide also.
在罩式电炉内处理，采取液氮作为保护气体，并设真空抽气设备。
An experimental system simulating cold energy recovery of LNG with liquid nitrogen is established based on the anterior analysis.
在此基础上建立的试验系统测试结果表明，液氮模拟lng冷量回收汽车空调系统具有较好的冷量利用性能。
Based on the theory of similarity, similar modeling analysis of the liquid nitrogen simulative cold energy recovery system of LNG is conducted.
在相似理论的指导下，通过对比分析氮气和天然气的物性，对液氮模拟液化天然气汽车冷能回收系统进行了相似模化分析。
This system combines a highly insulated cooler with a liquid nitrogen reservoir so to maintain temperature sensitive samples at vapor phase temperatures.
该冷却器高度绝缘，带有液氮容器，保持样品的气相温度。
A protective gas generation system is adopted with dissociation of liquid ammonia to get hydrogen and air separation to get nitrogen.
生产氢有多种方法：天然气的蒸气重整，水的电解，氨的分解，石油蒸馏和氯生产的副产品。
A protective gas generation system is adopted with dissociation of liquid ammonia to get hydrogen and air separation to get nitrogen.
生产氢有多种方法：天然气的蒸气重整，水的电解，氨的分解，石油蒸馏和氯生产的副产品。
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