近年来，随机量子自旋系统的研究成为人们关注的热点问题之一。
Recently, the study of the random quantum spin systems attracts lots of attention of many researchers.
这也是本文了亮点之一，我们的目的是计算量子自旋系统的关联函数和比热。
This part is the highlight of the thesis, and our purpose here is to evaluate the correlation functions and specific heat of the quantum spin models.
建立以无相互作用的自族为1/2的粒子组成的自旋系统为工质，由两个绝热和两个等温过程组成的量子卡诺制冷循环模型。
The cycle model of a quantum Carnot refrigeration cycle working with many non-interacting spin-1/2 systems and consisting of two isothermal and two adiabatic processes is established.
建立以无相互作用的自族为1/2的粒子组成的自旋系统为工质，由两个绝热和两个等温过程组成的量子卡诺制冷循环模型。
The cycle model of a quantum Carnot refrigeration cycle working with many non-interacting spin-1/2 systems and consisting of two isothermal and two adiabatic processes is established.
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