Nonlinear dynamical stability of gap solitons in Bose-Einstein condensate loaded in a deformed honeycomb optical lattice

We investigate the existence and dynamical stability of multipole gap solitons in Bose-Einstein condensate loaded in a deformed honeycomb optical lattice. Honeycomb lattices possess a unique band structure, the first and second bands intersect at a set of so-called Dirac points. Deformation can result in the merging and disappearance of the Dirac points, and support the gap solitons. We find that the two-dimensional honeycomb optical lattices admit multipole gap solitons. These multipoles can have their bright solitary structures being in-phase or out-of-phase. We also investigate the linear stabilities and nonlinear stabilities of these gap solitons. These results have applications of the localized structures in nonlinear optics, and may helpful for exploiting topological properties of a deformed lattice.     

浅谈汽车离合器的设计及优化

离合器安装在发动机和变速箱之间的飞轮壳内,它的离合器总成固定在飞轮的后平面上,变速器的输入轴就是离合器的输出轴。驾驶员可以通过离合器控制变速箱和发动机的分离与结合状况。为了保证汽车起步平稳,并能有效的降低传动系统的振动和噪音,我们必须对离合器进行优化和设计。现在我们就来谈谈汽车离合器的设计及优化。     

中枢髓鞘源性抑制蛋白与中枢神经再生

Nogo是一类中枢髓鞘源性抑制蛋白,主要由少突胶质细胞表达,是抑制中枢神经元轴突再生的抑制因子。这些研究成果为探讨CNS损伤的治疗提供了新思路。论文综述了Nogo的结构及在CNS中对神经元轴突再生的抑制作用。     

无尾两栖类听觉中脑对声音时相信息的神经处理

时相特征处理是动物重要的听觉功能．介绍了关于无尾两栖类动物的听中脑（半环隆枕）神经元在声时相特征处理中的选择性反应的研究结果,阐明了这些选择性反应对动物个体进行声辨别进而维持物种的生存、繁衍具有的重要意义,提出了在半环隆枕处理时相特征研究中需要进一步解决的一些问题及研究方向．