考虑了非线性系统的反馈哈密顿实现问题，主要讨论两类系统：平面系统和输入通道由拉格朗日子空间张成的系统。
This paper considers the Hamiltonian realization of feedback nonlinear systems. Two kinds of systems are considered: a plane system and a system with input channels spanning a Lagrangian subspace.
梁的系统模型属于非线性无穷维系统的一个特殊类，即所谓的哈密顿仿射输入系统。
The mathematical model turns out to be a member of a special class of nonlinear infinite-dimensional systems, namely the so-called Hamiltonian Affine Input systems.
采用霍尔斯坦和普里马科夫提出的二次量子化方法把磁振子系统的哈密顿量简化，并应用平均场理论处理了哈密顿量中的非线性相互作用项；
Hamiltonian of magnons system was simplified by the second quantization method presented by Holstein and Primakoff. The nonlinear interaction term of Hanitltonian was dealt with by mean theory.
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