line congruence

In this paper, we define a Darboux line congruence about the time-like surfaces, and obtain corresponding Backlund transformation on time-like surfaces with condition K - 2mH + m2 -l2 = 0 or H = constant in R2,1.

本文对三维Minkowski空间R~(2,1)中具有性质K-2mH+m~2-l~2=0或H=constant的类时曲面定义了一个Darboux线汇,同时得到了相应的Bcklund变换。

This paper generalizes the classical Backlund theorem on time like surfaces with constant Gaussian curvature (CGC) K=1 in R 2,1 to the surfaces with K=1 in R 2,1 by a time like line congruence, and shows how starting from a given K=1 surface to construct an entire hierarchy of new ones.

通过类时线汇把经典 Backlund理论推广到三维 Minkowski空间 R2 ,1中具有常高斯曲率 K =1的类时曲面的情形 ,并且从已知的具有常高斯曲率 K =1的类时曲面出发 ,利用 Backlund变换构造了一个新的具有常高斯曲率 K=1的类时曲面 。

Fibrations of congruence of lines and applications of sections;

线汇的纤维化及截面的应用

In this paper, a way to detect the guide bit track under the complex building is introduced by the way of two curves crossing with the RD 385 In practical projects,the theoretical method has been applied successfully The problem of guide drilling of no dig installation of pipelines in complicated regions is effectively solve

就ＲＤ－３８５型导向监测仪在复杂建筑物下用双线交汇法准确地进行钻头位置探测和追踪问题进行了探讨，在工程实践中利用这一理论研究结果，有效地解决了复杂地带非开挖导向钻进的方向监控问

Simulating drainage holes with line sink drainage element;

排水孔模拟的汇线单元法

wired-radio cross-connecting system

有线-无线汇接系统

Economists know that places where transportation lines meet are good places,

经济学家们知道，交通线汇集的地方，

Fig12 is taken from a compilation of flight lines.

图12取自飞行测线汇总资料。

Some Properties of Rectilinear Congruence in Minkowski 3-space;

三维Minkowski空间中直线汇的若干性质

Lightlike Rectilinear Congruence in Three Dimensional Minkowski Space

三维Minkowski空间中的类光线汇

This is the place where the three main arteries of west London traffic meet

这是伦敦西区三条主要干线汇合的地方

This is the place where the three main arteries of west london traffic meet.

这是伦敦西区三条主要干线汇合的地方。

The Correspondence between Focal Surfaces of Rectilinear Congruence in Minkowski Space E_1～3;

关于三维Minkowski空间中直线汇的焦曲面对应关系

Finenet Electronic Circuit Ltd

汇达电子线路有限公司

Research on Nonlinear Dynamics Characteristics of RMB and International Exchange Rates;

人民币汇率与国际汇率的非线性动力学研究

You should take the A train and get off at Broadway station.

您应该乘a线车，在百老汇站点下车。

the point where two lines meet or intersect.

两条直线的相汇处或相交处。

Textiles--Morphology of fibres and yarns--Vocabulary

GB/T8695-1988纺织纤维和纱线的形态词汇

Research on Non-linear Dynamic Models of RMB Real Exchange Rate;

人民币实际汇率非线性动态模型研究

New Discovery on Exchange Rate Based on Nonlinear Tendency;

汇率理论的新进展和非线性态势研究

Nonlinear STAR Model of Exchange Rate in Mean Reverting;

汇率均值回复的非线性STAR模型

Research of Secure Data Aggregation Protocol in Wireless Sensor Network

无线传感器网络数据汇聚协议的研究

Runoff concentration calculation using isochrones and GIS

基于GIS的等流时线法山洪汇流分析