这是一种制冷方法，源于他在低温物理学方面的工作。
It was a method of refrigeration which rolls from his work in low-temperature physics.
北京大学物理系低温物理专业七二级毕业实践小组；
Graduation Practice Group; Low Temperature Physics Speciality; Department of Physics; Peking University;
利用物理性能测试系统（PPMS）对材料的低温电阻进行了研究。
The low-temperature resistance was also investigated by Physical Property Measure System (PPMS).
利用物理性能测试系统（PPMS）对材料的低温电阻进行了研究。
The low-temperature resistance was also investigated by Physical Property Measure System (PPMS).
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