把自然热位差当做自然风压在理论上是模糊的，是不符合矿井实际情况的。
Taking natural thermo-potential difference as natural draft pressure is ambiguous in theory and not in accord with the actual condition of mines.
阐述了造成主井回风的自然热位差产生原因和对通风系统的影响，以及治理办法。
Mine, the causes of natural thermal potential difference in return air in main shaft and its influence on mine ventilation system and the control methods.
它们之所以能起作用是因为一般的材料，比如碲化铋，如果其中一部分比另一部分热，内部就会产生电位差。
They work because certain materials, such as bismuth telluride, generate an electrical potential difference within themselves if one part is hotter than another.
得到了通过回热器的焓流、质量流量及脉管冷端压力和流量相位差的代数计算公式。
The algebraic expressions of enthalpy flux and mass flow rate in regenerator as well as the phase difference between pressure and mass flow rate at pulse tube cold end are presented.
实验得到了铜在常温下的调制频率与相位差间的实验数据，通过对实验数据的线性拟合得到了铜的热扩散系数，以及铜-不锈钢在300 K和20 K低温下的接触界面层热阻。
The experimental data of copper was obtained about the phase lag dependence of modulation frequency at normal temperature, and the thermal diffusivity of copper was acquired by using the linear fit.
实验得到了铜在常温下的调制频率与相位差间的实验数据，通过对实验数据的线性拟合得到了铜的热扩散系数，以及铜-不锈钢在300 K和20 K低温下的接触界面层热阻。
The experimental data of copper was obtained about the phase lag dependence of modulation frequency at normal temperature, and the thermal diffusivity of copper was acquired by using the linear fit.
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