基于分形理论，提出了流体机械轴心轨迹稳定性的定量评价指标。
Based on fractal theory, the index to evaluate the running stability of fluid machine is put forward.
零位走动量即瞄准线射击前后变化量，是光学瞄具稳定性定量评价指标。
The variational momentum of the zero position is that the sighting line of object space changing quantity after the fire, is the quantitative evaluation target of the optic aiming device.
目的：开展手背部皮肤老化形态学定量评价指标的研究，为客观评价皮肤老化提供手段。
Objective To develop a morphology research on the quantitative evaluation indexes for skin aging of the dorsal hand.
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