Therefore, it is necessary to study numerical methods which preserve the symplectic structure of the Hamiltonian system.

因此，研究保持哈密尔顿系统的辛几何结构特征的数值方法是必然的。

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The band structure model of commensurate double-walled carbon nanotube (DWNT) was built by using tight-binding Hamiltonian with curvature effect included.

采用紧束缚能带理论，利用所提出的考虑卷曲效应的紧束缚能量哈密顿量，建立了公度双壁碳纳米管（DWNT）的能带结构模型；

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Therefore, it is necessary to study numerical methods which preserve the energy conservation or the symplectic structure of the Hamiltonian system.

因此，研究保持哈密尔顿系统的能量守恒性及辛几何结构特征的数值方法是必然的。

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