方法：用经典物理学的扩散理论探讨扩散运动引起的信号衰减与温度、时间的关系。
Methods; To study the relationship between signal attenuation and temperature or time by the theory of diffusion movements on classical physics.
目的：比较非理想均匀磁场和线性梯度磁场中扩散运动引起的信号衰减对温度、时间的依赖性。
Objective; To compare the dependence of signal attenuation on temperature and time caused by the diffusion movements in inhomogeneous and linear gradient magnetic field.
有含湿砂层存在的被动蒸发冷却层屋面的温度波衰减，在本质上不同于干燥状态情况。
The attenuation of temperature wave in humid sand layer on an evaporation cooling roof differs from that in dry sand layer in essence.
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