最近的技术蓬勃发展，以下通过在强磁场，从而影响PET图像分辨率和衰减校正领域的改变正电子的运动技术障碍。
The technology recently blossomed following passing a technical hurdle of altered positron movement in strong magnetic field thus affecting the resolution of PET images and attenuation correction.
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.
海滨地区广泛存在涡动沙纹，它很大程度上决定着波浪衰减和泥沙运动。
Vortex ripples widely exist in coastal area and greatly control the attenuation of wave and movement of sediment.
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