在二维或三维的情况下，屈服极限是当所有应力分量的某个函数达到某一固定值时达到的。
In two and three dimensions the yield limit is reached when a certain function of all the stress components reaches a fixed value.
该方法使用一固定宽度窗口内的电网电压数据来估算其基波分量的幅值和相位。
Voltage data within a fixed width window are used to estimate the amplitude and phase of the fundamental component.
这种模型的未知参数分两类，一类是固定效应，一类是方差分量。
The unknown parameters of this model are divided into two categories: one is the fixed effects, and the other is the variance components.
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