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The shear stress distribution on the radial cross section at the midpoint in the longitudinal direction of the blood pump for different impeller speed adjusting intervals: (a) impeller speed adjusting interval of 0.01 s; (b) impeller speed adjusting interval of 0.03 s; (c) impeller speed adjusting interval of 0.05 s; (d) impeller speed adjusting interval of 0.1 s.
