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1.低温装置(包括管道、容器等)的绝热方式,常用的有哪几种?举例说明其特点,并作比较评述。 2.简述用稳态法测定固体材料低温热导率的原理,画出装置简图并作简要说明。试作误差分析,由误差分析指出在设计装置和测试中应注意之点。 3.简述固体比热理论,低温下晶格比热和电子比热各遵循何种规律? 4.画出标定温度计用的低温恒温器简图并略加以说明,今欲在4—273K范围分度金铁—镍铬热电偶,回答以下问题:
1. Insulation methods of cryogenic devices (including pipes, containers, etc.), which are commonly used? Give an example of its characteristics, and make a comparison review. 2. Briefly described the steady-state method for the determination of low temperature thermal conductivity of solid materials principle, draw the device sketch and make a brief description. Trial error analysis, error analysis pointed out in the design of devices and testing should pay attention to. 3. Briefly described the theory of solid specific heat, the low temperature lattice specific heat and electronic heat follow what rules? 4. Draw a thermometer used to calibrate the cryostat and slightly to illustrate, to be in the 4-273K range Indexed gold iron - nickel-chromium thermocouple, answer the following questions: