1) central curve with positive integer degree
正整数次中心曲线
1.
The definition of plane central curve with positive integer degree was proposed.
给出了平面正整数次中心曲线的定义和中心命题。
2) non-central conic
非中心二次曲线
3) the center real quadratic curve
中心实二次曲线
1.
We sum up the unified definition of the center real quadratic curve by working at the two locus problems of plane analytic geometry of advanced―maths.
通过对高中《平面解析几何》的两个求轨迹问题,总结出中心实二次曲线的一个统一的定义;对定义的充分必要性进行了严格的论证;又通过方程的系数讨论对中心实二次曲线进行了分类。
4) center of a quadric
二次曲线的中心
5) curve realignment
曲线整正
1.
According to the actual requirements of the curve realignment after the existing railway speed increasing,the traditional theory of involutes is abandoned and the coordinate measurement is used to directly realign curves.
针对既有铁路提速后曲线整正的实际要求,抛弃传统的渐伸线原理,利用测点坐标直接进行曲线整正。
2.
The mathematical model for railway curve adjustment is derived, and the corresponding formulas for curve realignment are given.
在研究铁路线形特点和曲线整正原则的基础上,探讨以既有铁路线实测坐标为观测值,运用最小二乘平差方法进行曲线整正计算的方法。
3.
Existing railway curve realignment is an important part of existing railway reconstruction design,and the result directly affects the design quality,project cost and operation safety.
既有铁路曲线整正是既有线改建设计中的重要部分,且结果直接影响最终设计质量和运营安全。
6) Curve realinement
曲线整正
1.
This paper presents the optimum design principle and method of the existing railway curve realinement.
提出具有线性约束和非线性目标函数的既有铁路曲线整正最优化设计原理和方法,使得铁路曲线整正趋向于更精确、更合理、更科学。
补充资料：正整数
即“自然数”(1159页)。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条