The design of integral non-backpressure piston rings was studied in order to reduce wear and to raise the piston ring life.
为了减少磨损，提高活塞环的使用寿命，对整体无背压活塞环的设计进行了研究。
At present, the calculation of non integer order differential and integral is becoming more and more important.
目前，非整数阶微积分的计算已日益显示出其重要性。
These methods can't be used not only to analyze the non integral order harmonics, but to distinguish the eccentricity and the first harmonic, and contain the lager nonlinear error.
这些方法不能分析非整次谐波，不能区分一次谐波和偏心分量，并且含有较大的非线性误差。
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