The increasing of the width of the groove makes the phase velocity decreased largely but almost no effects on the bandwidth , and the coupling impedance enhanced 槽口宽增大相速减小较多，频宽几乎没有什么变化，耦合阻抗增大。
( b ) when the depth of the groove is relatively shallow , the helical triangle - shaped helical groove has the widest bandwidth , the least dispersion , and the fastest phase velocity 门）当槽的深度较浅时，三角形螺旋槽的频带宽度最大，且色散最弱，波的相速最大。
( b ) when the depth of the groove is relatively shallow , the helical triangle - shaped helical groove has the widest bandwidth , the least dispersion , and the fastest phase velocity ( 2 )当槽的深度较浅时,三角形螺旋槽的通频范围最大,且色散最弱,其中波的相速和群速最大。
With the radius of the center conductor increasing , the phase velocity is also decreased a lot , the bandwidth is relatively widened , and the dispersion of the structure is weakened but the coupling impedance is lowered 轴半径增大，相速明显减小，频宽有一定程度的增加，色散减弱，耦合阻抗值降低。
Patients with augmented caloric nystagmus in light during routine caloric test were all rechecked , and the slow - phase velocity was measured with electronystagmographic recordings to calculate the visual suppression index 摘要在常规温差测验中，出现视觉抑制消失而明室下温差眼振增强之病人，给予重复检查，并以眼振电图记录之。
When the experimental frequency is above the critical frequency of 0 . 5 mhz , that the measured velocities are phase velocities must demand that propagation distance in the anisotropy media is less than two times of the transducer ' s diameter 以0 . 5mhz频率为界，大于此频率时，只要各向异性样品的传播距离小于换能器直径的两倍，测得的速度认为是相速度。
Based on new seismic code " code for seismic design of buildings " ( gb50011 - 2001 ) , a method of selecting parameters and equivalent phase velocity of the earthquake wave for multidimensional analysis is suggested 以最新发布的《建筑抗震设计规范》 ( gb50011 ? 2001 )为基础，提出了地震动随机模型参数的取值。此外，对考虑多点问题时地震波视波速的取值方法提出了建议。
Any homogeneous viscoelastic medium subjected to one - dimensional tension and compression can be characterized in terms of the phase velocity c ( w ) and the attenuation coefficient deduce the complex modulus and the other equivalent viscoelastic functions 一维的纵向压缩波在同质的粘弹性介质中传播时，材料的粘弹性特性主要通过纵向波的传播速度c ( w )和衰减系数a ( w )两项来定义。
( c ) for the helical swallow - tailed structures with same groove width , the deep groove depth one which is suitable for the use in a interaction system of high power twts , has the largest coupling impedance and the lowest phase velocity in comparison with the other different groove profiles （ 3 ）具有相同槽日宽度的燕尾形螺旋槽结构在槽深度较深情况下用作大功率行波管的互作用系统具有最大的耦合阻抗和最低的相速。
Because of the resonant interaction between the reb electrons and the wave excitated by the embp instability , the reb electrons cannot transport continuously , but in form of current clumps . the transport velocity is close to the phase velocity of the wave 因为embp不稳定性所激发的波和束流电子之间的共振相互作用，束流电子不是连续地传播，而是以电流团的形式传播，传国防科技大学研究生院学位论文播速度接近于波的相速度。
