To realize operation of combined network between nitrogen system and air system, a scheme of adding gas crossover lines is employed.

为实现供氮和供风系统的联网运行，采用了增设气体跨线的方案。

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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。

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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。

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State oil company Pemex drilled dozens of new wells and built a system to inject nitrogen gas.

FORBES: Crude Cassandra

Rather than eliminate nitrogen oxide via a bulky chemical treatment system that even the EPA questioned initially, EGR would make the motor do all the work by piping exhaust gas back into the cylinders and burning it again a cleaner, cheaper, lower-maintenance solution, which would set Navistar ahead of the pack.

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In Europe the trucking industry has settled on a technology called selective catalytic reduction, in which urea is periodically injected into the exhaust system to break down the NOx, converting nitrogen oxides into (somewhat) harmless ammonia.

FORBES: Clearing the Air