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。
2
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。
3
The article introduces the principles and peculiarities of some guiding techniques in horizon directional drilling project with comparison of their applicability.