二次曲线

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。

We systemically discuss how to uniquely decide an infinite plane homography matrix by using the structure information in scene and how to evaluate a homography matrix which convert affine reconstruction to Euclidean reconstruction by solving absolute conic images.

系统地讨论了如何利用场景中的结构信息，来唯一地确定无穷远平面的单应矩阵，进而由射影重构恢复仿射重构，以及如何通过绝对二次曲线的像求解将仿射重构变换为欧氏重构的单应矩阵。

In the first part, depending on three or more images, the main research work are listed as follows:(1) using SVD decomposition to realize projective reconstruction;(2) realizing camera self-calibration by solving Kruppa's equation;(3) recovering Euclidean reconstruction from projective reconstruction. Depending on only two images, the main researches are:(1) making out infinite plane homography matrix by using scene structure information, then recovering affine reconstruction from projective reconstruction;(2) making out the absolute conic images by using scene structure information, and then recovering Euclidean reconstruction from projective reconstruction.

在第一部分中，针对三幅及三幅以上的图像，主要研究：①利用矩阵奇异值分解实现射影重构，②通过求解Kruppa方程实现摄像机自标定，③由射影重构恢复欧氏重构；针对只有两幅图像的情况，主要研究：①利用场景结构信息求解无穷远平面的单应矩阵，由射影重构恢复仿射重构，②利用场景结构信息求解绝对二次曲线的像，由仿射重构恢复欧氏重构。

The results showed that acidifier supplementation in the diet at different levels improved feed intake and daily weight gain in a quadratic manner. The supplementation of organic acid improved the availability of DM, protein, organic compound and energy in the broilers at the age of 0-21 days. Comparing with the control test, the supplementation of 0.05%, 0.3% and 0.4% organic acid improved the availability of protein p

结果表明：①饲粮添加不同剂量乐达酸化剂，使肉鸡采食量和日增重呈二次曲线变化；②饲粮添加有机酸能不同程度改善肉鸡0-21日龄饲粮干物质、蛋白质、有机物和能量的利用率，与对照组相比，0.05%、0.3%和0.4%乐达酸化剂组饲粮蛋白质利用率极显著提高p

To solve the problem about determinant and solution to tangent line of curve of second order in Analytic Geometry with viewpoint and methods of Higher Geometry.

利用《高等几何》的观点、方法解决《解析几何》中的二次曲线的切线的存在性与求法问题。

Two theorems on chord at contact equation of a nonsingular conic have been proved.

证明了非退化二次曲线切点弦方程的两个定理。

However, when determining the different orders of four points, there is difference existing in the conic section type.

但是，不同顺序的四点在决定二次曲线类型存在着差异。

This paper , which aims at the developing strategy of express service ,researching and analyzing Chinese and foreign express corporations current situation ,forecasts the demand of Chinese express market in 15 years with conic section model on the base of statistics.

本文立足于快递业的发展战略，调查并分析了中外快递公司在我国发展的现状，根据实际的快递业务数据，利用二次曲线预测模型方法对未来15年内的快递市场需求量进行预测，并在分析快递业存在问题的基础上，提出了快递业谋求发展的措施以及应付激烈竞争的对策。

The biomass accumulated before flowering and seed yield were conic section while terminating flowering and maturity stage linear correlation respectively.

增加开花后群体的光合生产量油菜不同生育时期形成的生物产量对子粒形成的作用不同，初花之前形成的生物产量与子粒产量呈二次曲线关系，而终花期和成熟期的生物产量与子粒产量呈直线关系。

Four goats (42.4±3.5 kg) surgically fitted with cannulas in common bile duct and abomasal were used in 4×4 Latin square design and randomly fed diets contained 20%, 30%, 40% or 50% of starch to determine the effects of rumen escape starch, by altering dietary starch concentration, onα-amylase secretion in goats. Increasing rumen escape starch results in a quadratic increase in pancreaticα-amylase secretion.

活体分泌试验表明，日喂3次情况下，胰胆汁分泌量和α-淀粉酶分泌活性呈非匀速分泌，在饲喂前后1h内最高(P.05)；胰腺α-淀粉酶总分泌活性随随过瘤胃淀粉数量的提高呈二次曲线变化(P.05)，过瘤胃淀粉为102g/d时胰腺α-淀粉酶总分泌量达到最大。

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