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1·The paper analyses the dynamic flow force of spool valves using the momentum theory of fluid.

本文用动量理论对滑阀液动力进行了全面的理论分析。

2·Based on the blade element-momentum theory, this paper studied the aerodynamic performance prediction model for small wind turbines.

基于叶素动量理论分析了小型风力机的气动性能分析模型，并提出了叶片的气动优化设计方法。

3·In the range of high tip-speed ratio the results calculated by this method are closer to experimental data than that computed by momentum theory.

在高尖速比范围内，本方法给出的结果比动量理论给出的更加接加接近实验数据。

4·In this paper, we discussed the transition selection rule of electrical dipole radiation in atom physics by the parity theory and angular momentum theory in quantum.

本文利用量子力学的宇称理论和角动量理论，对原子物理学中所熟知的电偶极辐射的跃迁选择定则进行了理论探讨。

5·Combining momentum theory and vortex theory, rotor circulation equation was deduced. The rotor down-wash flow field was calculated using generalized down-wash flow model.

结合动量理论和涡流理论，推导了桨叶环量方程，用广义尾流模型计算了旋翼下洗流场。

6·The approach of blade-element theory is opposite that of momentum theory since it is concerned with the forces produced by the blades as a result of the motion of the fluid.

叶片元素理论的方法与动量原理的方法相反，因为它关注的是由流体运动导致叶片产生的力。

7·To incorporate the important effects of the rotor wake, the far-field boundary condition derived from the rotor momentum theory and the cyclic boundary condition have been used.

为了充分考虑旋翼尾迹对流场的影响，采用周期性边界条件和由动量理论导出的远场边界条件。

8·From fluid flow momentum theory the basic equation of flow dynamic forces in the spool closing process is derived, and the spool dynamic equation of the two-way cartridge valve is established.

本文根据流体动量理论导出了阀芯关闭过程中液动力的关系式，在此基础上建立了二通插装阀阀芯关闭运动方程。

9·The shroud at high speed is modeled as an elliptic wing in order to construct a momentum theory method to investigate the aerodynamic characteristics of ducted tail rotor in hover and forward flight.

引入尾流收缩比因子，并将大速度时的涵道等效为圆形机翼，建立了一个适合于直升机悬停和前飞状态涵道尾桨气动特性分析的动量理论方法。

10·The theory does provide some insights into how momentum might work.

这个理论提供了一些惯性如何工作的观点。