This method involves forward modeling wavefield identification,interactive travel time pickup,minimum travel time ray tracing in the interface net,spline coefficient inversion instead of slowness inversion and final velocity field synthesising.
该方法利用正演模型识别波场，用交互法拾取走时，采用界面网最小走时射线追踪法进行射线追踪，并用反演样条系数代替反演慢度，最后合成速度场。
However,multiple modes and different dispersion properties make travel time extraction of single mode difficult.
薄板超声Lamb波层析成象研究中,走时是重要的信号特征,但多模式和频散特点给单一模式走时提取带来困难,一般信息提取技术对Lamb波分析较难有理想结果。
Exact traveltime computation in multi-layered transversely isotropic media with vertical symmetry axis;
多层垂直对称轴横向各向同性介质精确走时计算
(1) To ensure the stability of the program,we also consider the refracted and diffracted waves to calculate the traveltimes.
回顾了波前扩展有限差分地震波走时算法及其主要优缺点,分析了该算法在程序实现过程中存在的一些问题。
Traveltime-computation is widely used in seismic modeling, imaging and velocity analysis, etc.
走时计算已广泛用于地震建模、成像及速度分析等诸方面。
Fast marching method (FMM) is a fast, accurate and stable traveltime computation method.
波前快速推进法(FMM)是一种快速、准确而稳定的走时计算方法,它不仅计算速度快、灵活性好,而且对任何复杂速度场都具有无条件稳定的特点。
Maximimal tardiness in two-machine no-wait flowshop with setup, processing and removal time separated;
有分离调整和移走时间的两机器no-wait流水作业最大延误问题
The maximum tardiness in three-machine flowshop problem with separated setup,processing and removal time is discussed,where the setup time and removal time steps of the same job can overlap on three machines,but the processing time can not.
以最小化最大延误为目标函数,讨论了三台机器的流水作业问题,其中每个工件的操作由"调整"步、"加工"步以及"移走"步组成,而工件的调整和移走时间都与加工时间相分离,同一个工件的"调整"步和"移走"步在三台机器上可以重叠,但"加工"步不能重叠,并且第一台机器上没有空闲时间,工件一旦开始加工就不允许中断。
In this paper,we discuss the total tardiness in two-machines flowshop problem with setup and removal time separated,where setup step and removal step of the same job is overlap on two machine,but the processing step can not be,and there is not idleness on the machine M_1.
讨论了一类两机器流水作业的总延误问题,其中每个工件的操作由“调整”步、“加工”步及“移走”步组成,而工件的调整时间和移走时间均独立于加工时间,同一工件的“调整”步及“移走”步在2台机器上可重叠进行,但“加工”步不能重叠,并且第一台机器上没有空闲时间,工件一旦开始加工就不允许中断。
In this paper, a new method of time reversal for defect diagnosis of concealed structure has been proposed based on the detecting technique of structure acoustic wave and the theory of time reversal.
本文基于结构声波检测技术及走时反演理论，提出了一种用于隐蔽结构缺陷诊断的走时反演分析方法，建立了联合高差异步测试的波速结构走时反演递推公式。
A new method of time reversal for defect diagnosis of concealed structure has been proposed based on the detecting technique of structure acoustic wave and the theory of time reversal.
基于结构声波检测技术及走时反演理论,提出了一种用于隐蔽结构缺陷诊断的走时反演分析方法,建立了联合高差异步测试的波速结构走时反演递推公式。
Regularization in traveltime tomography for reflection seismic data;
浅谈反射地震走时层析中的正则化