Scale Effect on the Anisotropy of Acoustic Emission in Coal

Table 3

Constants and correlation coefficients (R²) in specimens with different sizes.

	25 mm	38 mm	50 mm	75 mm
C1	2.82	2.48	2.17	2.19
C2 (×10^−10)	4.15	3.18	2.16	1.61
R^2	0.78	0.80	0.73	0.68