对涡旋膨胀机真实气体理想(等熵)膨胀过程进行了理论分析，提出了涡旋膨胀机真实气体设计压比的概念和计算方法，并进行了实验研究。
The concept of design compression ratio of real gas in a vortex expander and computational method are put forth. The corresponding experimental study has been done.
水力压裂过程中存在的损害主要包括粘土膨胀与颗粒运移损害、机械杂质引起堵塞损害、支撑裂缝导流能力的损害等。
The damage during hydraulic fracturing mainly included clay swelling and grain migration, built up created by mechanical impurities, the damage of fracture conductivity and so on.
巷道底臌有挤压、压曲、膨胀和剪胀等形式，压曲底臌是最常见的一种形式。
There are roadway floor heave types such as extrusion, bending under pressure, expansion and shearing dilation, among them bending under pressure is the most common type.
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