With combination of bi-directional difference method and FEM, the computation and comparison analysis on cooling effect of flexible pipe and black pipe in TGP are carried out.

利用双向差分法和有限元法相结合，对三峡大坝采用软冷却水管和黑铁管的冷却效果进行了计算与对比分析。

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A directional protection based on traveling wave current polarity comparison which is implemented by detecting the polarity of current wavefront of traveling wave is presented.

文章提出了基于检测行波电流波头极性的行波电流极性比较式方向保护。

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The article introduces the principles and peculiarities of some guiding techniques in horizon directional drilling project with comparison of their applicability.

文章介绍了水平定向钻施工中各种导向技术的基本原理和各自的特点，并对其适用性进行了比较。

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But something like 70% of shoppers go shopping with a directional list, not detailed enough to do a lot of direct price comparison.

FORBES: How Retailers Can Benefit From Consumer 'Showrooming'