The features of phase and group velocity were advanced by means of preparing samples with different shaping . the phenomenon of " cusp " in group surface of quasi - shear wave ( qsv ) was observed . the inversed velocity surface according to calculated elastic constants in real orthotropic media is consistent with practical measured velocity surface 用加工不同样品形态的方法给出了正交各向异性介质的相速度和群速度特征，观测到各向异性介质群速度面上的尖点现象，并用测试得到的正交介质的弹性常数进行了数学模拟，其波场特征与测试的速度面特征相符。
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。
And then simulations of gas - particle two phase plane wake and gas - particle two phase plane jet were carried out by using this model . after numerical simulations of the two flow fields were finished , series of analytical work was done . first , the distribution of time - averaged velocity , turbulence intensity was analyzed , and some of the simulation results were compared with those of the experiments ; the coherent structure of vortices in the near wall region of the plane wake flow were studied by describing the evolution of the eddy structures , including the forming , developing and shedding from the wall of the vortices in the near wall region ; the coherent structure of vortices in the whole field was also studied , such as the forming , developing , moving , pairing and merging of the eddies etc . 在对上述两种流动形态的二维大涡模拟研究中，首先全面地分析了气相时均流场的速度、湍流强度的分布规律以及气相速度的脉动规律等并就部分数值模拟结果与实验结果进行了对比研究；分析了平面尾迹流场中近壁处旋涡拟序结构，全面和逼真地反映了近壁处旋涡的生成、发展和脱落的规律；描述分析了平面尾迹流和平面射流的全场流动旋涡拟序结构，从整个流场的角度反映旋涡的生成、发展、运动以及旋涡之间相互配对、合并的作用规律等。
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 paper introduces the principle of transient rayleigh wave exploration and the calculating process of f - k region analysis , according to experimental data analyzes the influences of the parameters on the calculation of phase speed of rayleigh wave and the various factors affecting transient state rayleigh wave exploration , at last , gives some advices on how to choose the best sampling rate , group interval , offset , vibrating source and receiver 介绍了瑞雷波勘探的原理和f - k域分析法的计算过程，分析了各参数对瑞雷波相速度计算的影响，通过实验数据分析了影响瑞雷波勘探的主要因素，就如何选择最佳采样率、道间距、偏移距、震源以及检波器等提出了几点建议。
The relationship between the gas and particles is obtained as well as the distributions of velocities both of gas and particle , temperature , particle number density , and other turbulent qualities such as turbulent kinetic energy and its dissipation rate . it finds that micro zone clean control through the well - designed flow pattern is possible 在仿真的条件下探讨了气流运动和颗粒运动的关系，初步研究了通过气流对不同分区进行洁净度的控制实现的可能性，得出了不同送风状态下气相速度场和颗粒数密度的分布、温度及相关的湍流量的分布。
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 x - ray diffraction , scanning electronic microscope and the squid were used to characterize the properties of the mgb2 core in mgb2 / fe tapes and wires . the effect of the proportion of mg , b and sic as well as the sintering parameters on the phase formation , microstructure and the critical current densities of mgb2 / fe tapes and wires was discussed in details . the results showed that the high purity of mgb2 core could be synthesized by both the traditional vacuum sintering and the sparking plasma sintering and the vacuum sintering environment restrained the oxidation of mg effectively 相对于传统真空烧结, sps烧结方式成相速度快、样品晶粒细小均匀、 mgb2超导芯致密性好、晶间连接优良,因而sps烧结样品的临界电流密度明显高于传统真空烧结样品,其中未掺杂的带材样品经过sps800 , 15分钟烧结后,自场下的临界电流密度jc值在10k时达到8 . 64 105a / cm2 ,而且随着测量温度和外加磁场的增加, sps烧结样品的临界电流密度下降率比传统真空烧结样品缓慢,在20k ,自场时为5 . 97 105a / cm2 , 20k , 3t时,临界电流密度值仍大于104a / cm2 。
The effect of air distributor on the flow fields was studied with emphasis . the working conditions of the bubble column simulated in the numerical study were as same as in the experiments . the velocity profile at axial direction showed a peek in the center , and a backward flow near the wall when usl / usg < 19 . 6 鼓泡塔内轴向液相速度的径向分布呈塔中心峰值、壁面附近倒流形式，且与气相折算速度大小有关，当液相折算速度一定时，随气相折算速度增大而愈加陡峭，返混也剧烈。
