周期边界条件的选择和添加至关重要,周期边界条件的类型分为奇对称(odd symmetry)和 偶对称 ( even symmetry ),对如图所示模型,磁体1和磁体3的磁化方向在径向上相反,转过60度后,同一个位置上的两个边上的单元具有相反的自由度.
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Moreover, corresponding to different filter length N and frequency vector setting modes(traditional symmetry or even symmetry), 4 types of all-phase half-band filters were designed.
并针对不同的滤波器长度N和频率向量的设置(传统对称或偶对称),设计出了4种全相位半带滤波器。
Even the sinister bio-mimicry of the Preying Mantis, luring unsuspecting pollinators to their death, has a beautiful symmetry to it.
即使是邪恶的捕食螳螂,它用以引诱不知情者上钩的拟态,也是一个美丽的对称形态。
Even the city's stateliest sections lacked Paris's charm and symmetry.
即便纽约最精致的细节也比不上巴黎的魅力与协调。
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