共查询到19条相似文献,搜索用时 46 毫秒
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本文利用二维FIR系统输出的四阶统计累积(cumulant),识别出系统的冲激响应函数。我们的方法允许测量噪声是有色高斯的,以及二维FIR系统是非最小相位的,非可分的。 相似文献
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本文讨论了二维Fermi液体中的声传播,给出了零声和一次声的有关唯象结果;又根据量子多体理论,计算了准粒子的激发谱、寿命和有效质量. 相似文献
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In this paper we discuss the thermodynamic property of the F-AF phase transition by starting from Kittle's free energy expression of the antiferroelectrics. Both the characteristics of the polarization and the P-E relation obtained by the theory are i n good agreement with the experiments. 相似文献
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混合自旋模型的动力学相变 总被引:2,自引:0,他引:2
考察了混合自旋模型的两种组态按Metropolis动力学随时间的演化,并分析了其在平方格子上的Darnage。计算结果表明存在有一高温相和一低温相,与平衡相变符合。 相似文献
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HU Gen-you 《理论物理通讯》1986,6(1):39-47
The p=2 lock-in phase transition in surface reconstruction is studied within the soliton picture by a two-dimensional lattice effective Hamiltonian,which has the coupling of the semiinfinite crystal.An analytical form of the p=2 soliton is obtained.Having complicated structure and narrowed width,the Soliton solution is found to be different from the ordinary form.This behavior is due to the coupled extra dis-tortion of the incommensurate phase in the surface reconstruction,and is necessary for the p=2 lock-in phase transition.The theory is consistent with many known experimental results and is applicable to other physical systems. 相似文献
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Using the bosonization method of one-dimensional fermion system, we discussed the bosonized Hamiltonian of the half-filling Hubbard model, and investigated the ground state and phase transition properties with the gaussian effective potential method of sine-Gordon field. 相似文献
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