Analyses results show that the materials, tension and rigidity of wires, speed of trains, wave speed, and lift forces are primary factors that affect fatigue life of contact wires.

分析结果表明，接触导线线质、张力和刚度以及列车运行速度、波动传播速度和抬升力是影响导线疲劳可靠性的主要因素。

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Based on the mechanics of wave, the expression of water wave propagation velocity under the action of gravity is deduced and the effect of surface tension on small wave is analyzed.

本文根据波动理论推导出在重力作用下波的传播速度表达式，分析了微小波动中表面张力的作用。

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Profile (flatness) : after the establishment of coiling tension, there shall be no wave in the F4 mill stand exit in visual.

板形(平直度)：在卷取张力建立后，F4机架出口带材目测无波浪。

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The most cosmopolitan city in Africa, Jo' burg has always been thoroughly multicultural, but a wave of xenophobic attacks in May 2008 highlighted the tension between locals and the huge number of African immigrants who have moved to the city, attracted by its relative economic vigor.

CNN: Johannesburg's growing pains