查询词典 persistent wave

The wave function of the phonon is assumed to take thecoherent state,a self-consistent integrodifferential equationsatisfied by the electron wave function is derived.Solving for thisequation,we get the polaron ground-state energy E=-0.1085α2, whichis very close to these of previous strong-coupling theories.In chap.4,we will apply approaches developed in chaps.2 and 3 to discuss theimportant two-dimensional(2D)polaron problem.

把声子部分取成相干态的形式，我们推导出电子波函数所满足的非线性的微分积分方程，求解这个方程，我们得到基态能为E＝-0.1085α2，它与以前的各种强耦合理论的结果非常接近，在第四章中，我们利用在第二，三章中发展的方法讨论很重要的二维极化子问题。

It has been shown that when the theoretical phase shifts are used the poor accuracy in the determination of the interatomic distance is due to the use of the plane-wave rather than the spherical-wave approximation in the EXAFS scattering theory.

研究结果证明：（1）在EXAFS测定C（2×2）S/Ni（100）金属吸附表面结构的数据处理中所发现的理论相移相对实验相移存在的较大误差来自于EXAFS散射理论中所采用的平面波近似。

The main factors effecting on exploration precision of surface wave are analyzed in the light of calculation of phase velocity of surface wave; the merits and demetits of common computing methods for phase velocity between stations and their applied range are discussed and calculation of interstation Green's function for correcting phase is put forward to get the precise phase difference between two stations.

分析了影响面波勘探精度的主要因素，针对计算面波相速度的精度问题，讨论了常用测量台间面波相速度方法的优缺点及其适用范围，并提出通过测量台间格林函数进行相位校正，以得到两台之间的精确相位。

The main factors effecting on exploration precision of surface wave are analyzed in the light of calculation of phase velocity of surface wave; the merits and demetits of common computing methods for phase velocity between stations and their applied range are discussed and calculation of interstation Green's function for correcting phase is put forward to get the precise phase difference between two stations.

分析了影响面波勘探精度的主要因素，针对计算面波相速度的精度问题，讨论了常用测量台间面波相速度方法的优缺点及其适用范围，并提出通过测量台间格林函数进行相位校正，以得到两台之间的精确相位。以合成的高频理论地震图作为记录信号，并在理论地震图上叠加了 2 0 %的随机噪声，利用这些方法分析理论信号，数字实验表明：在相干频率范围内，格林函数方法能够精确测量台间相速度，而互相关法和窄带通滤波互相关法所得结果较为离散。

We selected 223 pairs of Rayleigh wave from 2681 waveforms recorded by 58 tations in the EuroAsia land and west pacific region. The fundamentalmode surface wave was separated using the phasematch for each seismograms. The fundamentalmode interstation attenuation coefficients γ was calculated using the twostation methods.

根据欧亚大陆及西太平洋地区58个数字地震台站2861个长周期波形记录，从中挑选出符合条件的223对经过中国大陆的双台路径记录，采用相匹配滤波和频率域维纳滤波相结合的方法，计算出双台之间的混合路径衰减系数。

This one-way wave equation fits eikonal equation and transport equation corresponding to full acoustic wave equation in travel-time and first order amplitude. According to the perturbation theory often used in inverse solution, we split the velocity field into intraformational constant velocity background and variable velocity disturbance. Then we calculate time-shift quantity of migration and amplitude correction coefficients for wavefield depth continuation in total uniform formation and each formation.

基于反问题求解中常用的摄动理论，把速度场分裂为层内常速背景和变速扰动，求得整个均匀层波场深度延拓的偏移时移量及振幅校正系数、各层的偏移时移量及振幅校正系数，从而得到一个基于傅里叶有限差分法的双域保幅叠前深度偏移算子方程。

Summer monsoon precipitation in 1998 is simulated with different soil temperature and solar short wave radiation parameterization schemes using the improved p-σ nine level hybrid coordinate model.It is found that the improved soil temperature calculation method together with Lacis and Hansen short wave radiation parameterization has a good simulation for precipitation.

利用改进后的p-σ 9层混合坐标系模式，采用不同的土壤温度与太阳短波辐射参数化方案，对1998年夏季风降水进行模拟，发现改进的土壤温度计算法和改进的Lacis和Hansen 短波辐射参数化方法相结合能较好地模拟降水。

Then a fully coupled hydrodynamic-wave model OHERENS-SWAN accounting for interaction between wave and current is obtained and adopted to simulate longshore current in Rongxi area.

另一方面又将水动力模型COHERENS和第三代波浪模型SWAN耦合，使两模型能够随时互相交换水流、水位以及波浪信息，最终获得波流耦合模型COHERENS-SWAN并将其应用于荣喜近岸区波流共同存在情况下的波流作用模拟研究。

First, based on the analogy of the mathematical expressionbetween the propa gation of EM wave and that of seismic wavein a horizontal stratified earth, the re flectivity and transmissionformulation for EM plane wave propagating incident nor malto the layers are derived, the formulation with relation to pseudo-impulse is discussed and pseudo-impulse response is compared with impulse response of re flection seismology.

作者首先基于电磁波与地震波在水平层状介质中传播特征在数学形式上的相似性，推导了垂直入射平面电磁波在层间反射与透射传播函数，并讨论了它们与伪脉冲的关系，与反射地震学中脉冲响应作了对比。

Based on the spreading mechanism of seismic wave, introduced the locating method and software of microseismic monitoring. The main parameter was arrival time of P wave. The software was written by Matlab.

基于地震波在连续介质中的传播机理，采用P波到达时间为主要指标，编制了基于Matlab语言的定位软件。

Chimborazo and Cotopaxi, took me by the hand.

越过琴博腊索山和科托帕克西山。

This car is in a good condition.

这辆车的状况很好。