Study on the Electrical Control Mechanism of Gas Occurrence in a Microscale Coal Matrix.

The SECD of the coal samples demonstrates a decreasing trend followed by an increasing trend with increasing coal deterioration, overall exhibiting a good correlation with the SP values ( Figure 8 ).

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The SECD of the coal samples showed a decreasing trend followed by an increase with increasing coal rank, overall exhibiting a good correlation with the SP values; (3) four functional groups (C=C, C=O, C–O, and −OH) correlated with the SP and SECD values of coal samples.

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