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Dynamic NMR Microscopy of Gas Phase Poiseuille Flow

机译:气相泊流的动态NMR显微镜

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Dynamic NMR microscopy has been used to study xenon gas undergoing Poiseuille flow in the regime where deterministic and stochastic motions are the same order of magnitude. For short observation time, the flow profile images are largely influenced by the longitudinal diffusion, manifested by large displacements in both positive and negative directions. For longer observation time, the effect of the mixing between the fast and slow components due to transverse diffusion becomes apparent. A spin-echo version of the dynamic NMR experiment yields images exhibiting strong distortions for longer observation time due to fast diffusion under the "natural" gradient from magnetic field inhomogeneity (compared to results obtained with a stimulated echo version). This effect is used as an edge-enhancement filter by employing a longer time duration of the imaging gradient in a stimulated echo experiment.
机译:动态NMR显微镜已被用于研究在确定性运动和随机运动的数量级相同的情况下经历泊瓦数流动的氙气。对于较短的观察时间,流动剖面图像在很大程度上受纵向扩散的影响,纵向扩散表现为在正方向和负方向上的大位移。对于更长的观察时间,由于横向扩散,快组分和慢组分之间的混合效果变得明显。动态NMR实验的自旋回波形式产生的图像在较长的观察时间内表现出强烈的畸变,这是由于磁场不均匀性导致的“自然”梯度下的快速扩散(与受激回波形式获得的结果相比)。通过在受激回波实验中采用较长的成像梯度持续时间,可以将此效果用作边缘增强滤波器。

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