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Highlights 1. 3D DEM model was used to analyze the impact induced rock fragmentation. 2. The rock fragmentation intensity depends highly on the impact loading rate. 3. The three parameters generalized extreme value distribution function can describe the fragment size distribution characteristics.

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The f-QRS complex is significantly associated with LV dyssynchrony in DCM patients and can be used as a reliable index to evaluate ventricular synchrony and predict the prognosis in DCM patients with narrow QRS complexes.