纵波

The results show that there exist the fast P wave (qP1), fast S wave (qS1), slow S wave(qS2) and slow P wave(qP2) in 3-D dual-phase anisotropic media during the propagation of elastic wave. And the special phenomena such as the S wave splitting, the blind paints of the S wave splitting and wavefront triplication are clearly observed.

结果表明，弹性波在三维双相各向异性介质中传播时存在快纵波qP1、快横波qS1、慢横波qS2和慢纵波qP2，并清楚地观测到了横波分裂、横波分裂盲点、波面三分叉等特殊现象。

The radiation patterns of the compressional and shear waves from different sources are numerically studied.

准快纵波、准慢纵波和准SV波之间的耦合关系也被导出。

Three seismic waves illustrated in this paper refer to reflected compressional wave, refracted compressional wave and Rayleigh wave.

3种波指的是反射纵波，折射纵波，瑞雷面波。

To prove our theory, we have done some experiments: 1 observed the focusing and scanning of the longitudinal wave in isotropic solid ; 2 measured the transition process and weighting effect in isotropic solid; 3 observed the focusing of SAW wave on YZ-LiNbO〓 metaled surface and defocusing as deviation from the pure-mode direction.

为了验证理论，本文用声光衍射的方法观察了：(1)各向同性的Fused SiO〓固体中纵波声束的会聚及焦点沿轴线的扫描；(2)表面阵列在Fused SiO〓固体中纵波+1级会聚的过渡现象；(3)YZ-LiN-bO〓金属化表面上表面波在纯模方向的会聚以及对称轴线偏离纯模方向时严重的散焦。

The numerical results of stationary and transient Green'sfunction for high-velocity surface-head wave on some selected crystals are comparedThrough the above analyse,it is indicate that the first arrival wave mode is thelongitudinal-wave head-wave,and its propagate velocity is equal to the groupvelocity of the longitudinal bulk wave alone the surface.Furthermore,this modedoes not have the Δv/v effect,i.e.,its velocity is the same no matter the surface isfree or metalized.

通过对表面激发的瞬态和稳态Green理论分析和数值计算，表明在压电晶体表面上实际上看到的最高速的最先到达的波动模式是纵波头波，它具有沿表面纵波的群速度，而且对压电晶体，它不具有Δv/v效应，即在自由表面和金属化表面其传播速度是一样的，而压电晶体表面波及伪表面波均存在Δv/v效应。

In land areas with highvelocity rock outcrops,the seismic data recorded by vertical geophone deviate from the data of reflected compression wave with the increment of dip angle of strata and incident angle of reflection wave,which results in the difficulties of conventional seismic exploration in the near-surface high-velocity rock outcropped areas.

结果表明，当近地表速度为低速时，可以将垂直检波器记录的地震记录近似等同于反射纵波记录，这就是常规地震勘探在低速带区勘探取得成功的原因之一；当近地表速度为高速时，随着界面倾角和入射角的增加，垂直检波器记录的地震记录等效为反射纵波记录的误差增大，这就是存在高速近地表区地震勘探的难点之一。

C Explain how the vibrations of the cone of the loud speaker produce sound waves in the air and how these waves are transmitted through the air.

声波是纵波。关于上面的图解，画纵波在在扬声器和话筒之间的空气里生产的要描述的波型。

Based on the current ultrasonic equipment for rail inspection,we can use ultrasonic subsurface longitudinal waves to inspect the surface cracks in railheads,and the potential of this method for complementing conventional ultrasonic rail inspection is discussed.

在现有铁路钢轨超声检测设备的基础上，可采用超声次表面纵波对钢轨表面裂纹进行检测。本文应用边界元方法对钢轨中的次表面纵波的传播特性进行分析并进行了实验测试。

The basic principles of ultrasonic technology for porcelain post insulator detection are presented, which consists of longitudinal wave detecting with bevel probe and creep-wave detecting.

介绍了采用超声法对支柱绝缘子进行探伤的基本原理，探伤方法主要有纵波斜角超声波检测和爬波超声波检测两种，纵波斜角超声波检测速度较慢。

When the squirt flow mechanism occurs, the squirt flow mechanism dominates the contribution to the energy loss of compressional waves at low frequencies.

依据非牛顿流体饱和各向同性孔隙介质BISQ声学模型，喷射流动只影响纵波的频散和衰减，而饱和流体的非牛顿流效应不仅影响纵波，而且还影响横波的频散和衰减。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。