杆环

The distribution of engaging efficiency, EHD oil film thickness and tooth face wear and their changes along with transmission parameters are presented.

给出了超环面行星蜗杆传动啮合效率、齿面磨损量和弹流油膜厚度的分布规律及其随传动参数的变化规律。

The design represents the torus worm general design process.

该设计代表了环面蜗轮蜗杆设计的一般过程。

Over universal joint seal on to connecting rod.

将固定环(6100)推到连接杆的密封胶套的上面。

This paper of graduation project mailnly presents a systematic approach for the design of circular worm gear reducer .

这篇毕业设计的论文主要阐述的是一套系统的关于环面蜗轮蜗杆减速器设计方法。

Those various kinds of wrought iron products are famous for their beautiful shape and high value for use.

三、铁艺产品主要有锻杆、矛头、环柱等配件和铁艺大门、围栏、护窗、居室家具等，产品种类齐全、制作精美有较高的观赏价值和使用价值而闻名于世。

The predominant genera in most sampling sites were Fragilaria, Navicula, Cymbella and Gomphonema, but the dominant Cyclotella only in the Long Lake.

脆杆藻属、舟形藻属、桥弯藻属和异极藻属常为优势属，只在长海是以小环藻属为单一优势属的群落。

In March, May and July, Cyanophyta was the dominant one, with high proportions of 45.6%, 55.9% and 87.7%, respectively, whereas the proportions for Bacillariophyta decreased to 30.1%, 25.9%, and 1.1%, respectively. In November, proportions for Bacillariophyta and Chlorophyta were equivalent, 40% each, and the Cyanophyta composed below 20%. In December, Bacillariophyta made up 25.6% and Cyanophyta 38.2%. In March, May and July, dominant species of Cyanophyta were Microcystis aeruginosa, Pseudoanabaena, and Gloeothece linearis. In dry January, November and December, species of Bacillariophyta were dominated by A chnanthes sp., Melosira ambigua, Melosira granulata and Cyclotella meneghiniana.

全年中，蓝藻与硅藻比例变化较大，二者呈相反的变化趋势。1月份硅藻占较高比例（63.1％），蓝藻较低（〈20％）；3、5、7月份蓝藻比例较高（分别为45.6％、55.9％、87.7％），而硅藻较低（30.1％、25.9％、1.1％）；11月份硅藻与绿藻比例相当（各占40％），蓝藻低于20％；12月份硅藻与蓝藻比例分别为25.6％与38.2％。3月份和丰水期浮游植物优势种主要为铜绿微囊藻、假鱼腥藻和线形粘杆藻等蓝藻种类，枯水期的1月、11月和12月主要以曲壳藻类、模糊直链藻、颗粒直链藻和梅尼小环藻等硅藻种类为优势种。

The influence of MAH、 AA、 MAA、 AM and GMA on hydrophilicity of PP product surface was studied by reaction extrusion process in the twin screw extruder, where 1,1-bis (tert-butyl peroxy)-3,3,5-trimethylcyclohexane (LQCH335) as the initiator, and St as the graft co-monomer.

通过在双螺杆挤出机中熔融接枝改性PP，研究了以1，1-二叔丁基过氧化－3，3，5-三甲基环己烷(LQCH335)为引发剂，MAH、AA、MAA、AM和GMA为接枝单体，St为接枝共单体的多单体熔融接枝体系对PP制品表面可涂敷性能的影响，并利用静态水接触角进行表征。

In order to do research on pipe flow and pump characteristics of polymer flooding and water flooding rod-pumped well in especially high water-cut stage, rheometric test aimed at production stream from polymer flooding and water flooding rod-pumped well in especially high water-cut stage has been made, and the characteristic of production stream in especially high water-cut stage is confirmed as Newtonian fluid. Experiments using different mediums about pipe flow and pump characteristics is made. Frictional resistance and coefficient of friction resistance of annulus fluid between sucker rod and the pipe flow is calculated under different working conditions. Frictional resistance between plunger and pump barrel under different parameters is calculated based on related theory of pump characteristic and the strained analytical model of oil-well pump. Besides, using the theory of slit flow and hydraulic -clamping pressure, the frictional resistance is calculated, and the error between the result and measured value is no more than 13%.

为研究特高含水期水驱及聚驱抽油机井管流特性与泵特性，本文针对特高含水期水驱及聚驱井采出液进行了流变性试验，确定了特高含水期油井采出液的性质属牛顿流体；利用不同介质，进行管流特性与泵特性试验，得到了不同工况下杆、管环空流的摩擦阻力和摩阻系数；根据泵特性相关理论和抽油泵受力分析模型，计算了不同参数下柱塞与泵筒间的摩擦阻力，并利用缝隙流与液压卡紧力理论对柱塞与泵筒间的摩擦阻力进行了计算，计算结果与实测值误差在13%以内。

ABSTRACT This paper researches a new type of mechanical transmission mechanism, the toroidal drive.

本文研究了一种新型的传动机构--超环面行星蜗杆传动。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。