The pressure reduction coefficient of PE gas pipeline is an important design parameter, and depends on the soil temperature around the buried pipeline.
聚乙烯燃气管道的压力折减系数是重要的设计参数，取决于管道埋设周边地温。
The paper discusses the methods of the coefficient reduction in determining tunnel lining's external water pressure in the world.
论述了国内外计算隧道衬砌外水压力的折减系数法和渗流场计算方法。
Research on drag reduction mechanism of supercavitation shows that supercavitation can reduce not only the friction drag coefficient but also the pressure drag coefficient.
超空泡减阻机理的研究表明：超空泡不仅可以减小回转体的摩擦阻力，还可以减小回转体的压差阻力。
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