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We show that the scattering between two solitary waves in the Fermi-Pasta-Ulam model with interaction potential V (x) = αx^2/2 x^4/4 can be classified into four types according to the configurations of the solitary waves. For three of the four types, the large solitary wave can lose energy and the small one can gain in average by collision.For the other one type in a special parameter region we encounter an anomalous scattering, i.e. the large solitary wave gains energy and the small one loses energy. Numerical investigations are performed for the anharmonic limit case of α = 0 and the general case of α ≠ 0 and comparisons between them are made. 相似文献
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Normal thermal conduction in lattice models with asymmetric harmonic interparticle interactions 下载免费PDF全文
We study the thermal conduction behaviors of one-dimensional lattice models with asymmetric harmonic interparticle interactions. Normal thermal conductivity that is independent of system size is observed when the lattice chains are long enough. Because only the harmonic interactions are involved, the result confirms, without ambiguity, that asymmetry plays a key role in normal thermal conduction in one-dimensional momentum conserving lattices. Both equilibrium and nonequilibrium simulations are performed to support the conclusion. 相似文献
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研究了双势阱玻色-爱因斯坦凝聚体系(BEC)的自俘获现象(self-trapping). 在平均场近似下通过相平面(phase space)分析的方法研究了两种自俘获的机理:1)势阱中的粒子数在平衡位置附近振动,而相对相位随时间单调变化(running-phase); 2) 势阱中的粒子数和相对相位都在平衡点附近振动. 研究了周期调制场对自俘获现象的影响,发现发生自俘获现象的相变参数能够被周期场非常有效的调制,从而在弱相互作用BEC体系中也可以观察到自俘获现象. 还研究了多体量子涨落对自俘获现象的影响,讨论了在现有的实验条件下对凝聚体自俘获现象进行观察和周期调制.
关键词:
玻色-爱因斯坦凝聚
自俘获
双势阱
周期调制 相似文献
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本文研究了细菌的蛋白质多肽组分统计特征与基因组GC(Guanine+Cytosine)含量的相关性,发现当多肽长度较小时多肽组分特异性与GC含量存在着很强的关联;随着多肽长度增加,上述关联发生突变,关联迅速丧失.这一结果表明,基于组分特异性确定细菌亲缘关系的方法的确给出了不同于GC含量的信息,从而能实现有效分类. 相似文献
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本文应用影像云纹法、频率编码法对短圆柱组合薄壳的屈曲现象进行了研究,给出数字化的初始曲面和屈曲模态图像,将现代光力学法用于快堆主容器结构稳定性模拟体分析实验研究,取得较好的实验结果。本项目的研究成果,为我国制定快堆主结构的安全性评估提供科学依据。 相似文献
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用已经提出的二维平面映射的奇怪吸引子结构讨论了这类平面映射的奇怪吸引子分片的机理,给出了有关判据。以Henon吸引子为例说明了这种机理的合理性. 相似文献
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