文章基于非线性跟踪微分器、非线性度变换以及PID校正的思想，构造了一种新的非线性PID控制结构。

This paper proposes a new nonlinear PID model of valve controller based on nonlinear tracking-differentiator, nonlinear norm and PID adjustor.

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使用锥上拓扑度理论，研究二阶非线性奇异微分方程组两点边值问题正解的存在性。

By using fixed point index theory in a cone, we study the existence of positive solutions of boundary value problems for systems of nonlinear second order singular differential equations.

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使用锥上拓扑度理论，研究二阶非线性奇异微分方程组两点边值问题正解的存在性。

By using fixed point index theory in a cone, we study the existence of positive solutions of boundary value problems for systems of nonlinear second order singular differential equations.

youdao