A tracking estimation method of network equivalent parameters of facing nodes is researched with the variation of operation point.

该文研究了面向节点，随运行工况变动跟踪估计电网等值参数的方法。

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On the strength equivalent hypothesis, the theory relation between stress-damage coupling effect and variation of crustal gravity field.

利用应变等效性假设，推导了地壳体的应力-损伤耦合效应与地表重力变化之间的理论关系。

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The variation of equivalent stress near the hole wall with the depth of the teeth pressed is analyzed.

详细分析了孔眼壁附近的等效应力随牙齿压入深度的变化关系。

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The difference was equivalent to the average variation in cognitive scores between children born at a normal gestational weight and those weighing less than 3.5 pounds, the researchers said.

WSJ: Exercise in Short Bursts Is Effective