Table 1 Coal sample base parameter test results.

From: Study of the vibration frequency characteristics of tectonic coal containing assemblages at different loading rates

Name of coal sample

Moisture (%)

Ash (%)

Volatility (%)

Fixed carbon (%)

Robustness coefficient

Virgin coal

0.74

8.93

9.14

81.33

1.57

Tectonic coal

0.77

3.95

14.59

68.95

0.45

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