| 1 | NMR imaging studies of coal swollen with pyridine显示文摘NMR imaging is a new NMR technique which appeared in these twenty years. The most important difference from the traditional NMR technique is that it can distinguish what signals will be provided by which part of the sample. Since Lauterbur reported the first NMR imaging in 1973, this technique has been widely used in biological, medical, geological, and material studies. NMR imaging technique has also been used in the study of coal structure in | Ma, ZR Zhang, PZ Ding, GL Li, LY Ye, CH | 1997 | Chinese Science Bulletin1997，42，16： | 2 |
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