a compression wave in decelerating flow steepens.

压缩波 ，另一类是横波。

using compression wave ultrasonic transducers to measure velocity of surface waves and dynamic modulus of elasticity for concrete;

着重从剥落量、抗折强度、抗压强度和动弹模量四个方面研究了混凝土盐冻剥蚀破坏的评定参数。

the research discovers that compression wave quality factor of the sands in desert surface increases as the buried depth and the compression wave velocity's increase.

研究表明：沙漠地区表层沙纵波品质因子随埋深、纵波速度的增加而增大。

abstr: the initial compression wave was caused when a high-speed train enters a tunnel. this wave arrives at the exit portal of the tunnel at local speed of sound and produces a pulse wave.

文章摘要：高速列车进入隧道产生初始压缩波，该压缩波以当地声速向隧道出口传播并产生脉沖波，脉沖波足够大时，会产生音爆响声。

the incident compression wave transmitted by the hopkinson bar into the specimen is reflected as a tensile one causing spalling.

入射的压缩波通过压桿透入试件并反射成拉伸波而形成层裂。

when a high-speed train enters a tunnel, a compression wave is formed ahead of the train which propagates along the tunnel at a nearly sonic speed.

为了降低噪声的影响，对高速列车穿越带有竖井的隧道时产生的压缩波进行了三维粘性流场数值模拟。

vector analysis and shock wave theory are applied to the initial phase during which the contact periphery expands more quickly than the compression wave fronts in the droplet.

对于第一阶段运用矢量分析和激波理论关系，建立了适用于高速撞击条件的非线性激波模型。

when high-speed train entering tunnel, compression wave and micro-pressure wave will be created, which will result in the pressure fluctuation in carriages and noises at the tunnel exit.

高速铁路对环境的噪声污染是个不可忽略的问题，列车高速通过隧道或封闭声屏障时产生的微气压波就是其中危害之一，它严重地影响着铁路附近居民的正常生活。