球面

Expression methods and growing rules accord with self-organization way are studied for binominal curves and surfaces such as arc, spiral, helicoid, ellipsoid and fractal curves such as snow-form curve.

研究了圆弧、螺旋线、螺旋面、椭球面等常规二次曲线/曲面以及雪花曲线等分形曲线的自组织表达和生长规则，实现并验证了其生长算法。

Bolometric flux, hypersphere cosmology, large scale structure of universe, quasars, supernova, gamma ray burst, redshift periodicity

谱视亮度，超球面宇宙，宇宙大尺度时空结构，类星体，超新星，射线暴，红移周期性

In order to solve the problems in system of four aspheric mirrors, Fresnel mrirror and the catadioptric projection lens, the method that free form surfaces were used to design ultra-thin imageing system was put forward at last.

为了解决上述四片非球面系统、Fresnel反射镜和折反系统结合投影镜头存在的问题，本文最后提出了采用自由曲面设计超薄成像系统的方法。

Result indicates spherical catadioptric panorama imaging system can better realize panorama observation ,and comparing with other kinds of catadioptric facial ,spherical catadiop2tric panorama imaging system has advantages such as small scene distortion ,low2cost and simple design ,etc.

结果表明：基于球面的折反射全景成像系统可较好地实现全景观测，同其他几种折反射面相比，具有场景畸变小、造价低、设计制作简单等优点。

By deriving the model of image formation of central catadioptric cameras in detail,we have calculate the epipolar curve constraint on corresponding image points in the two panoramic images and analyzed the feature of epipolar curve s.

研究了由双曲面镜面与球面镜面共同组成折反射系统并结合普通透视摄像头所构成的一类特定全景视觉系统，推导了该全方位摄像头成像模型以及外极曲线的计算过程，分析了外极曲线特性，最后通过实验进行理论验证。

In general, most 3D parametric design systems use plane and sphere as basic tools to draw a three-dimensional diagram. In this paper, we introduce a class of new drawing tools: conicoid.

通常大多数三维参数化CAD系统都只用平面和球面作为最基本的作图工具，这在某种程度上限制了三维参数化CAD系统的作图范围。

We prove that a diagram can be drawn with conicoid sequentially if and only if it can be described by a set of triangular equations of degree less than nine.

同时证明了一个三维几何图形可以用平面、球面和圆锥曲面构造出来的充分必要条件是这个三维几何图形可以用一个三角化的次数小于9的代数方程组来描述。

Secondly, according to the aberration balancing, the relationship between coefficient of conicoid and high-order spherical aberrations was presented, which can support the design of advanced performance folded lens.

然后以球差为例，分析了非球面面型系数与高级像差的关系，从而为折叠式超薄光学系统的像差平衡提供依据。

The groove spacing can vary in arbitrary forms, and the image surface can be chosen as a plane or a conicoid.

通过刻划在非球面基坯上的凹面光栅验证了光线追迹方法的可靠性。

Sphere fitting method, conicoid fitting method and line scanning curve fitting method are used to approach system error for the first time. The effect on the measurement error of each method is also analyzed.

首次利用球面拟合法、二次曲面拟合法以及行扫描曲线拟合法去逼近系统误差，并分析了各种方法进行系统误差校正时对最终测量误差的影响。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐