判断两割接点为同根电缆的简易方法

在日常维修中,经常会遇到对使用中的电缆进行割接处理的情况,但受地形、地物或线路影响,有些电缆不能全部挖出,只能在两割接点进行对接。如在两割接点电缆沟内有多根电缆,且电缆的直径基本相同的情况下，目视无法确认两割接点中哪根电缆为同一根电缆。下面介绍的判断方法在交流电力牵引区段运用中最为简易、可靠。

光缆割接点的准确判定

本文从如何准确判定光缆的割接点分析着手,通过四个方面提出了安全有效的办法。

本地网中用户隶属局(所)割接方案设计及施工方法

用户线路网的割接方案设计与施工是本地网维护的重要课题,其中隶属局(所)的割接是所有割接中涉及面最广、技术最为复杂的割接形式,文章就这种割接方式的方案设计、割接点选取、施工步骤等进行了简要的论述。

Enumeration of a Special Kind of Labeled Connected Graphs

This paper is concerned with the enumeration of a special kind of labeled connected graphs of which the cutpoint-graphs are trees.A new method—treelization is introduced, by which the enumeration of this special kind of graphs can be solved. The enumerative formula with generating function is derived. The method of treelization is powerful in solving enumeration problems of graphs and deserves further research. For example, using the similar way, another special kind of labeled connected graphs of which the block-graphs are trees can be enumerated.