Barely Significant

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In summary, it can be seen that with the increase of the chain speed, impact height and mass of impact load of the scraper conveyor, the maximum acceleration in X, Y and Z directions of the chain ring, scraper and central groove in the time of impact show an increasing trend, which indicates that the chain speed, impact height and mass of impact load have a certain degree of excitation of the vibration in the three directions of the chain drive system.
First, from the perspective of the evolution of cultivated land use ecological efficiency, the cultivated land use efficiency in the upper reaches of the Yangtze River is generally not high and is lower than the cultivated land use efficiency in the middle reaches of the Yangtze River [ 42 ], but it shows an increasing trend, which is consistent with China’s cultivated land use efficiency in recent years.