This article makes the numerical simulation of particles flow regime in a horizontal pipe by applying the theory of particles trace.

本文采用粒子追踪理论对水平管中粒子流动状态进行了数值模拟。

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The principle, method and relative influence factors of the trace line of PE pipe are introduced.

介绍了PE管示踪线的探测原理和方法及相关影响因素。

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While the water content in themud material is continuously supplemented in a trace amount by the water source from the drip pipe.

而泥浆 料中的水分从来自滴灌管中的水源得到微量而持续地补充。

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The pipe band, which can trace its links back to the 19th Century, will end on 31 March 2013.

BBC: Lothian and Borders Police pipe band to disband