坑道钻探中中深斜孔施工技术

从钻探器具选择、钻探硐室设计、钻孔结构、钻具级配、钻进参数、冲洗液、钻头参数等方面总结了江西德兴银山铜铅锌矿山接替资源勘探中在坑道内进行中深斜孔钻探的工艺技术。

Research on drawing coal effects in the dipping and steep——dipping coal seams

Controllable drawing roof coal mining method is applied either to rently inclined seam or to big dipping seam. This paper sums up four corresponding methods according to conditions of our country, and analyses the coal-recovering effects and proves applicated conditions and measures for improving by "drawing coal theory of the ellipsoid". Its conclusion basically consists with practice. This work is of guiding meaning for designing drawing coal technology.

识漂辨鱼与提竿

手竿钓鱼，识漂和提竿这两个环节，是能否获鱼的关键。尽管只是短短的一瞬间完全取决于鱼漂的反应。而鱼漂的各种反应又与各种鱼吃钩的方式相关。所以，为准确把握提竿，首先要识漂辨鱼，以星漂为例，主要有以下几种反应。