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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Circulated nitrogen system is designed to improve the wettability and fluidness of lead-free solder and to ensure that the solder joints are shiny and bright.

氮气循环使用，增加无铅焊料的侵润性和流动性，使锡点饱满光亮。

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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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There was a new system of liquid nitrogen to keep the pilot cool and to resist the crushing force of gravity at high speeds.

VOA: special.2010.07.07

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.

FORBES: Death By Hubris? The Catastrophic Decision That Could Bankrupt A Great American Manufacturer

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