向心作用

The kinematics of precision centrifuge isanalyzed in Chapter 2 adopting Homogeneous transformation and vector analysis.The calculating formulae of centripetal acceleration generated by precision centrifugeand acceleration acting on input axis, output axis and pendulous axis of accelerometerare deduced in theory under various conditions.

论文第2章首先用齐次变换法和矢量分析法对精密离心机的运动学进行了分析，从理论上推导出离心机产生的向心加速度的计算公式，以及各种条件下作用在加速度计输入轴、输出轴和摆轴上的加速度。

For these changes, the water in the meandering river will bring the movement of circulation.

在离心力和向心方向上的压力差作用下，弯道中水流将产生特有的运动方式，即弯道环流运动。

In the system of symbols, it could not demonstrate color and tendency. Each parts of polyphone should compose and flow which make stability and tendency of center tone. So it is no meaning of aesthetics for just researching the singled acoustics triad, for it does not make a sense of beauty and harmony.

但作为符号体系而言，独立的、脱离调性的单一的和弦音响，既不可能表现出它的倾向性，也无法显示它的色彩性，此外，由于音乐中必须有各个声部的各种组合运动才能显示出中心的稳定性和流动偏离的向心作用，因而孤立地研究和弦音响对心理的影响作用毫无审美意义，它不能给予听众以和谐与否的美感。

RESULTS: There were three functions of hamstring in gait cycle: decelerating the concentric contraction of the iliopsoas at bending hipbone; decelerating the concentric contraction of the quadriceps at knee bending; as well as making the lower limbs under the knee get certain angular momentum at toe-off, by eccentric contraction.

结果：腘绳肌在跑步周期中的作用有3个：在屈髋时通过离心收缩拮抗髂肌；在伸膝时通过离心收缩拮抗股四头肌；在支撑阶段通过向心收缩为膝关节提供动态稳固作用和使小腿和足获得一定的角动量。

Under the action of actuating medium pressure, the centripetal effect in seal is proved by finite element analysis.

通过有限元计算，证明了压裂泵柱塞密封在工作介质压力的作用下，有&向心效应&的存在。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。