平面曲线

Firstly, we calculate the Lie point symmetry of 1+2-dimensional nonlinear evolution equation:Which arises from the motion of plane curves in affine geometry.

我们首先计算了来自射影几何的平面曲线运动的非线性发展方程：所容许的李点对称群。

Which satisfies the mixed constraints in both Cartesian space and joint-variable space.

提出了一种满足笛卡尔空间与关节空间混合约束的机器人平面曲线轨迹规划方法。

One of the major difficulties in design of plane curved prestressed girder bridges is how to determine its center line of gravity of prestessing force of steel breafly written as c.

如何确定平面曲线梁桥中预应力钢筋合力重心线的位置，是一个尚未解决的问题。

They are ①cubic plane curve constituted with projective pencil of lines and line eonic

进而证明三个定理：①一次线束和其射影对应的二次线束，所对应直线交点的轨迹为三次平面曲线

Therefore at each time we get the roots of this cubic equation, we can decide if we keep or reject each root according to the continuity of the curved surface, the method is as follows: If , the relative cubic plane curve is just a circle, this circle can be gotten by solving .

因此在每次求得该一元三次方程的解时，我们根据曲面的连续性来判断这些根的取舍，方法如下：在处，所得的平面曲线就是圆截线，该圆截线可以由相截得到，即。

And'.'' a plane cutting completely through it.

集'。''所形成的闭合的平面曲线。

In wire-cutting manufacturing of the top and bottom different curve,accomplishing cutting way of ellipse bias changing curved surface which between two plane curve into developable surface in order to calculate NC program of four axis ganging.

在上下异型工件的线切割加工中，宜采用椭圆偏置切割法，即将上、下两平面曲线间的曲面变成可展直纹面，进而计算四轴联动的数控程序，可保障加工的效率与效益。

Road design, calculation of the plane curve model categories, which translate such relaxation curves.

道路设计中，平面曲线计算的模型类，该类中可计算缓和曲线。

Is a special type of a set design, production as one of technology-based manufacturing companies, specializing in the production of space curve and flat curve, Cam-products are widely used in textiles, printing, packaging industries, especially in the textile Industry is nearly 10 years of technical experience accumulated.

西安滨田特型机械有限公司是一家集设计、生产为一体的技术型制造企业，专业生产各种空间曲线及平面曲线、主导产品凸轮被广泛应用于纺织、印刷、包装等行业，尤其在纺织行业更是有近10年的技术经验积累。

A plane curve is smooth if it is determined by a pair of parametric equations ,Whereandexist and are contiuous on, andand are not simultaneously zero on.

称平面曲线是光滑的，如果曲线可以由参数方程，决定，其中和在上连续，且和在上不同时为0。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了