Propagation logs rely on measuring the difference in properties of a wave at two receivers.
传播测井依赖于两个接收器测量的波的差异。
Quenching crack propagation characteristics of the organizations on both sides without decarburization phenomenon significant difference between crack and materials and forging cracks.
淬火裂纹的组织特征是裂纹两侧无脱碳现象，明显区别与锻造裂纹和材料裂纹。
The wave propagation characteristics of the splitter are numerically simulated by the finite difference beam propagation method and experimentally investigated.
首先用有限差分光束传播法模拟了器件的光波传播特性，然后进行了初步的实验验证。
Rayleigh wave propagation and dispersive curve in single layers semi-infinite space model and three dimensional road embankment are studied comprehensively by using finite difference software FLAC3D.
笔者利用有限差分软件FLAC3D，对单层介质半无限大体和三维路基体的瑞利波传播特性以及频散曲线进行了数值模拟分析；
According to the difference of passing current and constructive mode of conductor, the conductor propagation is divided into three-phase, two-phase and single-phase propagation, etc.
根据通过电流和导体结构方式的不同，导体传输可分为三相传输、二相传输和单相传输等。
A novel numerical algorithm SSFD (split-step finite difference) has been presented for solving nonlinear pulse propagation equation.
提出了一种新型的分步有限差分(SSFD)算法来求解非线性锁模脉冲传输方程。
The finite difference beam propagation method(FD-BPM)is used to design a device of 66% MMI-converter-Combiners.
采用有限差分波束传输法（FD-BPM）设计了一种66%模式转换、合并器。
At lower anodic potential and OCP, anodic dissolution is weak. The difference of dissolution between crack tip and other surfaces exist. These facts benefit the crack propagation.
阳极电位较弱以及开路电位下，阳极溶解较弱，裂尖和其他表面存在溶解性差异，这些因素有利于裂纹扩展。
Variational-Effective index method and Finite difference beam propagation method(FD-BPM) are both practicable waveguide simulation tools.
在众多的波导模拟工具中变分有效折射率法和有限差分束传播法都是实用性非常强的。
The finite difference beam propagation method(FD-BPM) can simulate the performance of the waveguide accurately.
有限差分束传播法则能够准确地模拟波导的性能。
So the main work in this dissertation is compiling and debugging the program for solving the field distribution in channel waveguides using three-dimensional finite-difference beam propagation method.
为此，本文重点完成了利用三维有限差分束传播法求解条形波导中场分布的计算程序的编写和调试。
The paper introduced the prestack depth migration from relief surface based on implicit wide-angle finite-difference one-way propagation operator and used SEG piedmont nappe structure model for test.
本文介绍了基于广角隐式有限差分单程波传播算子的起伏地表叠前深度偏移方法，并对SEG山前带推覆构造模型进行了检验。
The optical propagation properties of the device have been demonstrated by finite difference time domain method according to the waveguides directional coupling and self-imaging principle.
根据波导间相互耦合与自映像原理，采用时域有限差分法分析了该器件的光传输特性。
The three-dimensional finite-difference beam propagation method was used to compute the optical properties of fiber devices based on side-polished fiber.
本文还用三维有限差分光束传输法计算了侧边抛磨光纤波导的光学特性。
The alternate-direction implicit finite difference beam propagation method (FD-BPM) is used to analyze the two-dimensional (2D) symmetrical multimode interference (MMI) couplers.
交替方向隐式有限差分波束传输法被用来分析二维限制对称多模波导干涉耦合器。
The propagation velocities of the two orthogonally polarised modes in a "polarisation-maintaining" fiber are changed when exposed to external fields resulting in phase difference.
保偏光纤中两正交偏振模受外场作用，其传播速度发生变化，形成相位差。
In this paper, making use of Kalman filtering, we derive a new back-propagation algorithm whose learning rate is computed by Riccati difference equation.
本文运用卡尔曼滤波原理，提出了一种新的神经网络学习算法。该算法的学习速度是由带时间参数的里卡蒂微分方程来确定的。
Calculating on practical problems shows that both the finite-difference beam propagation method and the gain character programs can give reasonable results.
实际计算表明，本文所编写的有限差分束传播法和掺铒波导增益特性计算程序，均能给出合理的计算结果。
This paper presents a new 3d finite-difference (FD) method using spatially irregular grids to simulate elastic wave propagation in heterogeneous anisotropic media with topographic structures.
提出一种新的三维空间不规则网格有限差分方法，模拟具有地形构造的非均匀各向异性介质中弹性波传播过程。
This paper focuses on the perturbation which takes the sine form. The effect of amplitude, frequency, wave number, and initial phase difference on the propagation of optical soliton is investigated.
重点讨论了扰动是正弦函数形式时，耦合强度、频率、波数、初始相位差对光孤子传播的影响。
This article provides the application of the high-order, staggered-grid, finite-difference scheme to model elastic wave propagation in 3-d isotropic media.
本文应用交错网格高阶有限差分方法模拟弹性波在三维各向同性介质中的传播。
The compact 4-component 2-D finite-difference frequency-domain algorithm (2-D CFDFD) is one of the effective methods to calculate the propagation properties of ideal guided wave structures.
四分量紧凑格式二维频域有限差分（2-DCFDFD）算法，是求解理想导波结构传输特性的有效方法之一。
A finite difference frequency domain method (FDFD) is presented to analyze the propagation characteristics of waveguides with imperfect conductor and rough surface.
提出了一种基于图像处理算法和频域有限差分法相结合研究实际光子晶体光纤的数值分析方法。
A finite difference frequency domain method (FDFD) is presented to analyze the propagation characteristics of waveguides with imperfect conductor and rough surface.
提出了一种基于图像处理算法和频域有限差分法相结合研究实际光子晶体光纤的数值分析方法。
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