线汇

采用微元线汇理论和动量守恒定律建立了薄互层油藏阶梯水平井生产段沿程压降计算模型。

The analysis models of pressure drop along the production section of stepped horizontal well in the thin interbed reservoir are also established through the theory of infinitesimal line congruence and the law of conservation of momentum .

同时还提出了两种汇流模型：基于栅格的Muskingum逐栅格演算法和基于子流域的等流时线汇合法。

Meantime , two models of flow routing and confluence are established , including the Grid-Based Muskingum Flow Routing Method and the Sub-basin-Based Isochrone Method .

最后，讨论类光线汇的主要曲面，且证明了B-scroll恰好为主要曲面时线汇需要满足的条件。

Finally , we discuss the main surface of the lightlike rectilinear congruence , and prove what condition should be satisfied by the lightlike rectilinear congruence when B-scroll is just main surface .

将线汇转化成向量丛后从理论上证明了这种转化的正确性，利用向量丛的截面理论证明了Backlund定理并给出一种固定边界而求面积最小的曲面的迭代条件。

After congruence of lines changes into vector bundles , its correctness is proved , and theorem of Backlund is proved by using sections of bundles . A condition of iteration is given for seeking minimal area of a curved surface with fixed boundary curve .

E~3中的收敛线汇

The Convergent Straight-Confluence in E ~ 3

弦线汇及其应用

Congruence of Chords and Its Application

本文给出了伪球率线汇极小焦面稳定性的六个定理。

In this paper , we discuss six theorems of the stability on minimal focal surface .

同时山谷线和山脊线又是汇水线和分水线，所以它们在工程应用方面也有着特殊的意义；

What 's more , valley lines and ridge lines are respectively water collection lines and water divide lines , so they are also of special meaning to engineering application .