travelling valve

Anew structure of machine travelling valve for slant well pumping is pro-posed and the work principle of the valve is presented.

提出了一种适用于斜井采油的机械式游动阀的新型结构，论述了这种阀的工作原理，讨论了游动问连杆截面积和阀堵运动距离对泵阀工作的影响，在游动用连杆受力分析的基础上，给出了最小游动阀连杆截面积和最小阀堵运动距离的计算方法。

Final Castle——Contrary Architectural Notes in the Move Times;

最后的城堡——游动时代的反建筑笔记

Recurrence of random walks in an independent environment on a halfline;

半直线上独立随机环境中可逗留的随机游动的常返性

Property of random walk in time random environments on the line;

直线上时间随机环境中随机游动的基本性质

Using the random walk model to describe the intervals of feeding ends in the fixed size reeling process,we proved the distribution of intervals of feeding ends is a Gamma distribution through the characteristic function.

利用随机游动模型描述定纤缫丝过程中的接绪间隔 ,通过其特性函数给出接绪间隔分布可以表示为Γ分布的理论证明 ,解明分布参数与茧丝纤度特性、缫丝工程条件、目的纤度等之间的关系。

Community of Zooplankton and Assessment to Water Quality in Bohai Bay;

渤海湾浮游动物群落结构及水质生物学评价

The Situation and relation of mycrophyte,zooplankton and fish in the ecological restoration of a tropical shallow lake in a city;

热带城市湖泊生态恢复中水生植被、浮游动物和鱼类的关系研究

Effect of zooplankton on removing algae in bio-manipulation;

浮游动物在生物操纵法除藻中的作用研究