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Precision ball screw assembly (hereafter called “ball screw”), as shown in Fig. 1, is a mechanical wear out part that widely used in CNC (computer numerical control) machine tools to control the movement of processing targets and spindles. Up until now, there has been no simple way to directly measure ball screw for knowing the state of wear quantitatively. An indirect approach is logging all the...
The echogenicity of whole blood is known to vary during the flow cycle under pulsatile flow both in vitro and in vivo. However, the fundamental underlying mechanisms remain uncertain. The cyclic variations of high frequency ultrasonic backscattering signals have been measured for explaining the temporal variations of red blood cells (RBCs) aggregation under pulsatile flow. The level of RBC aggregation...
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