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提出了利用内复叠节流制冷循环获得３０ Ｋ～６０ Ｋ温区的新制冷方案。进行了与之相关的热力学问题分析，建立实验装置，首次获得了５０ Ｋ左右的低温
A new refrigeration scheme was proposed to obtain the 30 K ~ 60 K temperature zone by the internal cascade throttling refrigeration cycle. Carried out the related thermodynamic problems analysis, the establishment of experimental device, for the first time obtained about 50 K low temperature