我们发现在有能级交叉的有限大尺寸系统中，约化保真度是一个测量量子相变的有效工具。
We find the reduced fidelity is an effective tool in detecting the quantum phase transitions associated with level crossings for the finite-size systems.
当然，比系统尺寸大几个数量级的经典分子的动力学过程是可以看到且这个过程最长可达到毫秒级别。
With classical molecular dynamics it is, of course, possible to look at system sizes several orders of magnitude larger and to run dynamics up to milliseconds.
本文在三镜反射光学系统的几何光学理论基础上，尝试性进行了小尺寸、大视场、长焦距全反射系统的设计。
An all - reflective system with compact structure and wide field of view is designed on the basis of geometry optical theory.
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