波的传播

Based on wave propagation feature, this paper analyses 3D seismic migration algorithms such as alternating direction implicit method, LU decomposition method, and inverse operator approach method. The result shows that the alternating direction implicit method is fast but causes distortion in wave field extrapolation and affects image accuracy; however LU decomposition and inverse operator approach methods are fast while holding circular symmetry of wave field, and are promising in oilfield exploration and development.

在波的传播特征分析基础上，对交替方向隐式法、LU分解法、逆算子逼近法等三维地震偏移算法进行了分析研究，结果表明，交替方向隐式法虽然快捷但是在波场外推中明显产生畸变并影响成像的准确性，而LU分解和逆算子逼近法是保持波场圆对称特征前提下的快速算法，在油田勘探开发中具有较好的应用前景。

Based on one-dimensional Method of Characteristics, a numerical model of pressure-wave progation if presented in this paper. A special code is programmed to analyze and calculate waterhammer resulted from rapid opening or closing of valve in the experimental sodium loop of Fast Breeder Reactor.

本文利用一维特征线法，建立了压力波传播的数学模型，并编制了专用程序，利用该程序对快堆实验钠回路中由于阀门的快速开启与关闭引起的压力波的传播进行了分析计算。

Characteristics of Lamb wave propagation in multilayered composite plates are influenced by many factors, the most important of which are: constituent properties, thickness and fiber orientation, the number of layers, and lay-up sequence and the direction of wave propagation.

层状各向异性板中Lamb波的传播特性受许多因素的影响，其中最重要的影响因素是：组层材料的性质、厚度以及纤维的方向、层数、层序、Lamb波传播方向。

To provide theory foundation for inverted deduction work, numerical simulation for propagating in highway-surface with exceptional block and inanition and crack has been performed. The numerical simulation results show that the BEM is an effective method for the elastic-waves propagating in highway-surface concrete medium.

利用边界元法能够很好的描述弹性波在砼介质中传播的特性，正演模拟异常石块、脱空和裂缝对波的传播的影响，为进一步的反演工作提供理论依据。

The basic properties of elastic wave propagation in quadratic inhomogeneous damage materials are discussed by examples.

介质中的波的传播理论在国内外已得到广泛的研究[4-6]，但以往的文献大多研究的是均匀介质或分层均匀介质中的波的传播问题[7]。

Consequently, there exists no difference between the propagation constants of these waves, the rotation of plane of polarization is absent when a linearly polarize...

我们得出结论：这种波导可用来制作极化不灵敏移相器；而文献〔3、7〕中的结果(在这种波导中，右旋和左旋圆极化波的传播常数不相等；当线极化波通过它时出现极化面的旋转)是有问题的。

These results can serve as the theoretical bases for further research about the transmissive characteristics of pulse wave, meanwhile, these results can also be used to analysis and diagnosis related disease.

所得到的结果为脉搏波传播特性的进一步研究奠定了理论基础，也有助于临床上利用脉搏波的传播特性来分析和诊断相关的疾病。

Making use of field matching method,combining with the variational method,the dispersion equation of the ridge loaded ring plane slow wave structure and small signal gain of this type of TWT are presented in this paper.

脊加载环板行波管是一种频带相对较宽的大功率行波管，本文用场匹配和变分原理相结合的方法，研究了脊加载环板慢波结构的导波特性及这种行波管的小信号、大信号特性，讨论了结构的几何尺寸及电子注参量对慢波的传播特性、小信号增益及注波互作用非线性效应的影响。

The influence of thickness of acoustic absorbing material on propagation characteristics of unsteady gaseous detonation through the right-angle tee joint bend was analyzed.

在上述的直角三通弯管中安装声学吸收材料，研究气体非稳定爆轰波的传播特性。结果表明：声学吸收材料对弯管中非稳定爆轰波传播有很大的影响。

Then the effect of peg-leg multiples on wavelet is especially discussed, and get an equation which is expressed by linear dynamic system, and give an algorithm to solve the equation. At last, the time-variant wavelets are shown by theoretical model and application example.

第五章针对子波的时变进行了理论分析，主要讨论了短程微屈多次反射对子波波形的时变影响，将系统理论中的动态方程引入到波的传播过程中，得到了包含子波时变的状态方程和观测方程，并分析了它的解法原理。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。