行星环

旅行者2号的行星际探测，极大地丰富了我们对行星环的认识，给行星环动力学的研究带来了活力。

The planetary encounter of Voyager 2 greatly enriches our knowledge of planetary ring systems , and challenges the study of ring dynamics .

F环。还评述了天王星环以及行星环中的碰撞、光度理论和起源等问题的研究。

Work on Uranian rings and some general problems of the planetary rings including the collision process in the rings , the photometric theory and their origin are also elucidated .

当这一数据与有关其质量的独立信息结合起来时，所得出的新数据可揭示这些天体的表面是否崎岖不平，有无厚厚的大气层，甚至能告诉我们它们有无行星环或卫星。

When combined with independent information about their mass , the new data should reveal insights on whether the worlds are rocky or have thick atmospheres , even whether they have rings and moons .

由于能量散失再加上角动量重新分布，稠密的行星环系统就变得更为扁平。

The energy loss , combined with angular-momentum redistribution , causes a dense ring system to flatten .

在木星、天王星、海王星的系统中，卫星的位置也和行星环的特性密切相关。

Correlations of satellite positions and ring features occur in the Jovian , Uranian and Neptunian systems as well .

而紧接在劳希极限之外的区域，一些形状不规则的小卫星则可以和行星环共存。

Just outside the Roche limit is a zone where small , irregularly shaped moons can coexist with the rings .

环隙会一直拉大，直到卫星的斥力与行星环在碰撞时所产生向外扩散的力量达到平衡为止。

The gaps will grow until the satellite 's repulsive forces are counterbalanced by the tendency of rings to spread during collisions .

无论如何，卫星的引力竟好似在推开行星环中的物质。火星和金星是环绕太阳的两个行星。

In both cases , the attractive gravity of a satellite appears to repulse ring material . Mars and Venus are planets of the sun .

她在演唱会、音乐录像和过去的颁奖礼表演中曾戴着整副面具和行星环头饰，还曾把鸟窝样子的装饰品围在自己的头上。

In concert , on video and at past awards shows she has sported full facial masks , worn planetary rings around her head , and framed her face in what looked like a bird 's nest .

结合对行星齿环滑块机构运动学分析和结构设计约束，运用MATLAB优化工具箱对机构进行了优化设计。

Combined with the kinematics analysis of planetary gear-ring slider mechanism and the design constraint of structure , optimum design applied to structure using the optimized toolbox of MATLAB .

它一路扩散，乃至穿过行星的环。

It extends all the way out through the rings .

行星锥环无级变速器的最大传动能力的研究

A Study for Highest Transmission Capacity of Stepless Planet - Cone Transmission

行星螺环蜗杆传动啮合原理分析

Analysis of Gearing Principle of Toroidal Drive

三环板针摆行星传动环板针齿壳内曲线加工结果的检验

Inspection of the Curve Process Result of Pin Gear Housing in Double Crack Three Ring-Plate Cycloid

主要研究内容是：1.分析对比行星齿环滑块机构与传统往复运动机构的运行特点，选择行星齿环滑块机构作为试验台传动机构。

The main research content is : 1 . The characteristics of planetary gear-ring slider mechanism and traditional reciprocating mechanism are analyzed and compared . Planetary gear-ring slider mechanism is chosen as the transmission mechanism of test-rig .

CMC水溶液在内管做行星运动的环空中流动的流函数、切向速度和轴向速度分布；

The distribution of the stream-function , the tangential velocity and the axial velocity of the CMC aqueous solution in annulus with the inner cylinder executing a planetary motion are also numerically calculated ;

数值计算了CMC水溶液在内管做行星运动的环空中流动的流量，分析了流量与内管公转、自转速度和环空偏心距之间的关系。

The flow rate of the CMC aqueous solution in annulus with the inner cylinder executing a planetary motion is numerically calculated , and the relations of the flow rate and the revolution , the rotation velocity of the inner cylinder and the eccentric distance are analyzed .

粘弹性流体在内管做行星运动的环空中流动的数值计算

Numerical Calculation for the Flow of the Viscoelastic Fluid in Annulus with the Inner Cylinder Executing a Planetary Motion

优雅的土星环是区域性范例，但并不是唯一；太阳系的所有巨行星都有环。

Saturn 's rings are a graceful local example , but not the only one ; all the giant planets in our solar system have rings .

流体在内管做行星运动的环空中流动的流量计算星体大小的比例由乱流速度的快慢决定。

Calculation of flow rate for the flow of Newtonian fluid in annulus with the inner cylinder executing a planetary motion The range of turbulent velocities determines the relative proportion of small and large .

给出了运动双极坐标系中幂律流体在内管做行星运动的环空中流动时的控制方程以及内管法向应力分布的计算公式。

The governing equations and calculation formulas of normal stress distribution on the inner cylinder were given in bipolar coordinate system when power law fluid flows in annulus with the inner cylinder executing a planetary motion .

同样，在聚驱井螺杆泵采油工况下，采出液在抽油杆和油管所形成的偏心环空中的流动也可视为粘弹性流体在内管做行星运动的环空中的流动。

Likewise , in a polymer flooding production well by screw pump , the flow of the produced fluid in the annulus between pumping rod and oil tube can also be regarded as the same flow pattern .

所谓内管做行星运动的环空是指：构成环空的内管不仅绕其自身轴线自转，而且还同时绕环空外管的轴线公转。

The annulus in which the inner cylinder executes a planetary motion means that the inner cylinder not only rotates about its own axis , but also rotates about the axis of the outer cylinder in the annulus .

下一步天文学家试图找到这颗钻石行星是否有行星环。

The next step for astronomers is to find out if the diamond planet has rings .

本文介绍一种设计具有转差元件和行星齿轮的开环变速箱的车辆的性能预测方法。

A method for the prediction of performance is presented in this paper for the design of a vehicle having a split / circulated power transmission with slip elements and planetary gears .