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The quadratic system in space with a first integral of quadratic cylinder is discussed. 摘要继续讨论以二次柱面为首次积分的空间二次系统。
When the frist grade flexible mode and the rigid mode are intercepted the flexible manipulator is transformed into a quadratic system. 基于柔性臂简化的二阶线系统模型，指出前馈延时控制在本质上是一种零极点对消技术，得到了零极点对消应满足的条件。
The results prove that DF could simplify the solve process and its shortcoming of restriction in approximately denotation, frequency unitary 1 and inapplicability in more commonly quadratic system are also shown at the same time. 结果证明：使用描述函数法能够简化该问题的求解，但也暴露出其存在着近似表示，频率归1以及更一般二阶系统不适用等方面的局限和不足。
In this paper, we prove that the real quadratic system with one real straight line solution and two conjugate complex straight lin solutions is integrable system, so it do not has any limit cycle. 本文证明了具有一条实积分直线和一对共轭复积分直线的实二次系统都是可积系统;因而不可能存在极限环.
QUALITATIVE STUDY OF QUADRATIC SYSTEMS WITH SECOND ORDER FINE FOCUS 具有二阶细焦点的二次系统的定性研究
The two systems of government are polar opposites. 这两种政体正好相反。
On Quadratic System with a Two-fold Parabola Solution 具有二重抛物线解的二次系统
Phase Portraits for a Class of Planar Quadratic System 一类平面二次系统的相图
Linearizable Conditions of a Class of Quadratic System 一类二次系统可线性化的条件
Asymptotic stabilizable domain of quadratic system 二次系统的渐近镇定域
The two systems are, in effect, identical. 这两种制度实际上一模一样。
Global Phase Portraits for a Class of Quadratic System 一类二次系统的全局相图
Their difference is a quadratic residue of 17. 它们的差是17的平方剩余。
The branch of algebra that deals with quadratic equations. 二次方程式论处理二次方程式的代数学的分支
ON NUMBER OF LIMIT CYCLES FOR THE QUADRATIC SYSTEMS WITH A WEAK FOCUS AND A STRONG FOCUS 具有一个细焦点和一个粗焦点的二次系统极限环的个数
Some quadratic equations have no real roots. 某些二次方程没有实数根。
The Number of Zeros of Abelian Integrals for A Class of Plane Quadratic Systems with Two Centres 一类双中心平面二次系统的Abel积分零点个数
X2+3X+2=12 is a quadratic equation. X2+3X+2=12是一个二次方程式。
Interaction between systems or between properties of a system. 系统间或一个系统的各种特性之间的相互作用。
Quadratic approximations in two dimensions. 二维中的二次逼近法。

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