这个无序系统的维数一般是分数。

The dimension of the system is fraction.

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分形理论是研究一类无规则、非线性但具有自相似性的无序系统。

Fractal theory is used to study an irregular, non linear system which is characterized by self similarity.

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利用负本征值理论的态密度计算方法，研究了准一维双链无序系统的电子结构。

The electronic structure of quasi one dimensional disordered system is studied by the computation of the density of electronic states with the help of the negative eigenvalue theory.

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Now, the reason this condition always holds in ordinary mechanics is because you're never, in that case, concerned with a huge statistical population of particles where the disorder among them is an issue.

这个条件在力学中总是成立,这是因为在力学中,我们从来没有关注过大量粒子的统计行为，而对这些系统来说,无序是很重要的。

麻省理工公开课 - 热力学与动力学课程节选