Triggering and evolution of winter-time natural convection cooling effect in fractured-rock revetment embankments of the Qinghai-Tibet Railway are investigated by means of an air-flow function.
导出适用于变渗透率多孔介质的无量纲控制方程，并针对青藏铁路工程建设，分析了碎石护坡路堤冬季自然对流降温效应的产生和演化过程。
In addition, mute oil free compressor USES air convection principle, to achieve the natural cooling effect.
另外，静音无油空压机采用空气对流原理，达到自然冷却效果。
An experimental technique to study the cooling effect of natural convection in the embankment ballast is introduced.
介绍了一种研究路堤碎石层自然对流效应的实验方法。
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