用矩阵理论求出几种形式的参数矩阵变换时的模态矩阵，并讨论了功率不变原则下的变换。
Using the matrix theory, we derived the modal matrices of some parameter matrices in transformation, and discussed the transformation with principle of power invariance also.
提出学术期刊综合评价中指标数据标准化方法选择的三大原则，即同一指标内部数据相对差距不变原则；
Three major principles for the selection of indicator data normalization methods in multi-attribute evaluation are presented in this paper.
我们实现这些目标所使用的方法、工具和技巧（比如博客评论系统）有时改变地非常快。 但是这些原则是完全不变的。
The tactics, tools and techniques we use to achieve this goals– blog commenting systems, for example—change with sometimes surprising speed, but these principles are fairly static.
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