Air is entrained as water jetting into water cushion pool , the gas - liquid two phase flows field are formed . the every phase velocity field are measured by using piv and ptv ( particle tracking velocimetry ) method in the course of jet angle 75and60 in gas - liquid flows of water cushion pool . image house of two phase flows are set up 西安理工大学硕士学位论文使用数字图像处理技术中的piv和ptv测速技术就射流入水角75度和60度两种情况分别测量了水垫塘模型水气两相流流场的各相速度场，建立了相应的两相流流态图像库。
Directed by wave theory of fractured media , the elastic parameters of eda medium are determined in the light of hudson - fractured theory , and christoffel equation gives the formula of the phase velocity of p - wave by which , effects of velocity on behalf of kinetic characteristic and reflection coefficient on behalf of dynamical characteristic form fractured density and azimuty is discussed 本文以裂隙介质的波动理论作指导，根据hudson裂隙理论，求出eda介质的弹性参数。在此基础上，应用christoffel方程求出的地震纵波相速度表达式，探讨了裂缝密度和裂隙方位对代表波场运动学特征的纵波速度和代表波场动力学特征的反射系数的影响。
The influence of coriolis acceleration level on human oculomoor and perceptual responses to investigate the influence of different coriolis acceleration levels ( 0 . 329 cm / s2 > 0 . 493 cm / s2 ^ 0 . 658 cm / s2 ) on human subjective sensation and nystagmus . basic parameters including the pattern , the duration and the intensity of ci as well as mean slow phase velocity ( mspv ) , beat , time constant of slow phase velocity decay and duration of horizontal and vertical eng , were recorded 493cm s ‘ （ n ’ 20cm s2 ） 、 0石58cm妇’ （ ‘ 15cln s刁三种不同强度的科里奥利加速度引起的科里奥利错觉形态、强度、错觉持续时间及伴随的水平、垂直性眼震的眼震次数、最大慢相速度、平均慢相速度、慢相速度衰减时间常数、持续时间等参数的变化进行了观察。
Kc of each higher mode in ridge waveguide is a very important parameter , once kc is obtained , the wavelength , phase constant , phase velocity , waveguide wavelength , equivalent reactance , equivalent admittance and so on can be obtained simply . then ridge waveguide devices can be designed based on these paremeters . in view of the widely use of ridge waveguides , the research of kc is very important in practice 由于脊波导中主模及各高次模的kc是一个很重要的参数，求出了kc ，可以很简单地求出、相移常数，相速、波导波长、等效电抗、等效导纳等等，求出这些参数后就可以用各种方法设计脊波导元器件了。
We found the " forward stimulated raman scattering " will be excited if the pulse length is greater than plasma wave length . the " forward stimulation raman scattering " decreases the phase velocity and the amplitude of the wake wave which will lead to the reduction of maximum kinetic energy of the electrons trapped 结论是：当脉冲长度接近等离子体波长时，稀薄等离子体将发生“前向受激raman散射” ，它使脉冲后沿拉长，导致尾流场的相速度变小，以至于被尾流场“捕获”的电子最大动能大大下降。
The research on the rf characteristics of the conductor - centered helical groove sws . ( a ) in the " cold " system , we found that the changing of depth of the groove has no distinct effects on the phase velocity at the lower frequency region ; but with the increasing of the frequency , the phase velocity and bandwidth are reduced slightly , the structure is more dispersive and the coupling impedance is enhanced 对具有中心导体轴的矩形螺旋槽慢波系统的高频特性进行了理论研究： ( 1 )在冷系统中的研究结果表明：频率较低时，槽深的改变对相速的影响不是很大，随着频率的增大相速略有减小，同时带宽也有所减小，色散变得稍强，耦合阻抗增大。
Around 40 ; the neutral curve obtained by the growth rates of the temperature fluctuation has a ringlike curve separated from the main branch of nachtsheim s calculation by velocity fluctuation at the lower grashof number side ; and its phase velocity is close to the maximum mean velocity where the critical layer of the eigenmode locates . the thermal fluctuation decays rapidly as the nondimensional frequency above 0 . 4 , so that it means that the coupling effect between instability wave generated by buoyancy fluctuation and velocity waves by invicid instability seems weak enough for their critical layers in the range of the nondimensional frequency 详细研究了自然对流边界层中最早失稳的浮力振型的功率谱波长波速与临界层位置等基本特征和它为主导其他振型尚未失稳时按线性理论得到的3种相互独立振型的振幅分布。系统地测量了它所对应的温度和速度涨落的振幅增长规律和中性曲线，实验结果表明，温度涨落的中性曲线在低格拉斯霍夫grashof数
We found that different level coriolis acceleration stimulation had no significant influence on the duration of the illusion but had some influence on the pattern of the illusion , the intensity of ci increased with the levels of coriolis acceleration stimulation , and no significant difference was observed on nystagmus beats , peak slow phase velocity , mean slow phase velocity , time constant of slow phase velocity decay , duration of eng among different coriolis acceleration stimulation , but the direction of eng is consistent with the pattern of ci 结果发现：不同强度的科里奥利加速度刺激对错觉形态具有一定影响，错觉持续时间、错觉强度随科里奥利加速度的增加而增加，不同科里奥利加速度刺激下的眼震电图，其眼震方向与错觉形态是一致的，但无论是水平性眼震还是垂直性眼震，眼震次数、最大慢相速度、平均慢相速度。慢相速度衰减时间常数、持续时间等参数均无显著性差别。
The dispersive characteristic of sws is a very important parameter of the rbwo and rtwt , other parameters such as the phase velocity , group velocity , coupling impedance can be derived from the linear dispersion relation . recently , the photonic crystal have attracted many attentions of the scientists , which has become a hot point of the research , it is also a ps 周期慢波结构色散特性是研究高功率微波器件的一个重要参量,其他重要特性如相速、群速、耦合阻抗等参量都可以从色散关系衍生出来,准确,快速获得周期电磁结构的色散特性就显得尤为重要。
