圆环面

The numerical algorithm based on theories of projecting and Laguerre,such as homology,circular points and ω of absolute conic is established,an iterative elimination method is applied to boost the nonlinear problem solving.

通过调和射影及Laguerre定理的推论求解出平面圆环点的共轭虚像，利用平行六面体照片存在的三对圆环点的虚像，构造对无穷远平面绝对二次曲线的像ω的约束，使用辗转相除法求解非线性问题。

Due to the coupling of every Zernike circular polynomial in the annular field, the SEIDEL coefficients solved by wavefront fitting with circular polynomial for annular pupils with big central obscuration would have larger errors.

由于Zernike圆多项式各项在环域上的交叉耦合，对于具有大中心遮拦的环孔径波面采用圆多项式拟合求解SEIDEL像差系数存在较大误差。

It is a contact and complaisant seal, which allows the sealing surface radial fluctuating in certain amount.

它由多个带"指"的圆环片、前后挡板和隔片组成，是一种接触式柔性的封严结构，能允许封严面有一定的径向跳动。

And then charged in accordance with Circle uniform electric field distribution on the axis, and further discussion of uniform cylindrical surface at its axis and uniform electric field around charged spherical electric field generated by the results and full compliance with the Gauss theorem.

以均匀无限长带电直线的电场分布为基础，运用微元法和叠加原理研究了无限大均匀带电平面和无限长均匀带电圆柱面在其周围电场分布情况。然后根据均匀带电圆环轴线上的电场分布，进一步讨论均匀圆柱面在其轴线上的电场和均匀带电球面在其周围产生的电场，所得结果与高斯定理完全符合。

Through the analyse to the stator and rotor strength and oval locomotion orbit confirm the surface of the round ring driving the stator rub.

通过对电机定、转子的受力分析，以及椭圆轨迹的分析确定了圆环定子的驱动摩擦面。

In relation to the feature extracting, the first step is to extract the "simple" surfaces such as planes, natural quadric surfaces and tori. Planes considered as degenerated quadric surfaces, the quadric surface feature extracting should be more important in RE.

而在点云的特征提取中，首先提取的是包括平面、自然二次曲面(包括球面、圆柱面、圆锥面)和圆环面的"简单"曲面，我们认为平面是一种退化了的二次曲面，因此研究二次曲面特征的提取是其中首要的课题。

The SEIDEL coefficients solved by wavefront fitting with Zernike annular polynomial and Zernike circular polynomial were compared.

比较对于不同遮拦比的环孔径波面采用Zernike环多项式拟合与采用Zernike圆多项式拟合求取SEIDEL系数的差别。

Firstly, the developing principles of the cylindrical internal helical gear are proposed through analyzing the movement and geometry requirements, which provides continuous contact between the mating gear surfaces. The tooth surface of the internal helical gear in the new gearing can be imagined as being generated by the normal section of the conjugated surface of the ball-tooth, moving along the radial projection of helix line of the tooth-root circle. Also, the proposed surface can be approximate tangent to the conjugated surface of the ball-tooth along a spacial curve.

首先，通过分析保证行星轮作螺环运动时与内斜齿轮实现连续啮合传动的运动和几何条件，提出了圆柱内斜齿轮齿面的两种形成原理：即由球齿运动包络曲面的法截面沿其齿根圆螺旋线在径向的投影进行拓展所形成的内齿面，以及与球齿运动包络曲面呈近似相切接触的等螺距齿面构成的内齿面。

To form layers or strata.A toroid generated by a circle; a surface having the shape of a doughnut.

环面，环形圆纹曲面圆圈形成的超环面；具有炸面圈一样形状的表面

The shapes of the suspended ring in the present work are also designed to self-center the lens liquid, then influences of different shapes of the suspended rings on the variation of optical power of the meniscus are discussed.

悬浮的金属圆环同时被用来使透镜中的水滴自居中，讨论了具有自居中效应的不同悬浮圆环形状对弯月面光学功率变化范围的影响。

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。