Barely Significant

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In contrast, the gallium distribution in the Danville Coal showed asymmetric changes: in the Farmersburg Mine, the lowest concentrations were observed in the topmost benches, with an increasing trend toward the bottom of the seam, whereas in the Air Quality Mine, the opposite pattern was identified, with the lowest concentrations at the bottom and the highest at the topmost part.
Effects of Ultrasound Time, Power, and Temperature From Figure 1 D, the yield of proanthocyanidins showed a trend of increasing and then decreasing with increasing ultrasound time, and when the ultrasound time exceeded 30 min, the yield of proanthocyanidins instead began to decrease, which was attributed to the fact that excessive prolongation of the ultrasound time triggered the oxidation or degradation of proanthocyanidins [ 19 ].