在研究裂缝失稳机理及特征的基础上，应用突变理论，建立了裂缝的突变模型，并得出裂缝稳定性的判据。
Based on analyzing the mechanism of destabilization of crack in dam, the mutation model is established by use of catastrophe theory, and the criterion of the stability of crack is given.
在详细分析相电流差突变量选相基本原理的基础上，对传统相电流差突变量选相元件三相短路故障判据进行了改进。
Based on the detailed analysis of basic principle, the traditional three-phase short-circuit criterion of phase selection element based on sudden-change of phase current differential is improved.
选择边坡内某些监测点的位移突变特征作为强度折减法的材料破坏判据。
The displacement mutation characteristics of monitoring points were chosen as the failure criteria of materials in the shear strength reduction method.
并基于突变性判据，利用互馈面实际接触面积或分形维数曲线随名义应变变化的特征，得到了坝体与坝基互馈的转异判据。
With the help of catastrophe criterion, the anomalism criterions of the crossfeed between dam body and foundation are acquired from the real contact area or fractal dimension curve vs.
因此，将监测点位移是否突变、计算是否收敛作为顶板破坏的判据。
Therefore, how the displacement mutation and calculation convergence happened can be as a criterion to judge the roof damage.
为此，本文认为具有部分互溶组分活度系数的突变可做为多组元溶液分相的判据。
So the condition of phase separation for multicomponent solutions is that activity coefficient of some components have a increasation steeply at phase interface with partly miscible solution.
为此，本文认为具有部分互溶组分活度系数的突变可做为多组元溶液分相的判据。
So the condition of phase separation for multicomponent solutions is that activity coefficient of some components have a increasation steeply at phase interface with partly miscible solution.
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