Spiking sychronization regulated by noise in three types of Hodgkin—Huxley neuronal networks

In this paper,we study spiking synchronization in three different types of Hodgkin-Huxley neuronal networks,which are the small-world,regular,and random neuronal networks.All the neurons are subjected to subthreshold stimulus and external noise.It is found that in each of all the neuronal networks there is an optimal strength of noise to induce the maximal spiking synchronization.We further demonstrate that in each of the neuronal networks there is a range of synaptic conductance to induce the effect that an optimal strength of noise maximizes the spiking synchronization.Only when the magnitude of the synaptic conductance is moderate,will the effect be considerable.However,if the synaptic conductance is small or large,the effect vanishes.As the connections between neurons increase,the synaptic conductance to maximize the effect decreases.Therefore,we show quantitatively that the noise-induced maximal synchronization in the Hodgkin-Huxley neuronal network is a general effect,regardless of the specific type of neuronal network.     

环上的一种群具体作用的G-等变K-群(I)

讨论幺环上的一种群具体作用的G-等变代数K-群(本文只定义前两个群,其它高阶群将见我们的后续文章),这与通常熟知的经典情形(见[1,3])不相同,这里群在环上的作用相对于经典情形来说较“具体” 然后,计算有理数域Q第0阶群具体作用的G-等变代数K-群,这是本文的主要定理。     

Perpendicular Exchange Coupling in TbFeCo/FePt Bilayer Films

We investigate the structure and exchange coupling in TbFeCo/FePt bilayer films. It is found that FePt has the L10 structure and the easy axis of the FePt film is perpendicular to the film plane. Results of the vibrating sample magnetometer and the magneto-optical Kerr effect measurements show a strong perpendicular exchange coupling between the ferrimagnetic TbFeCo layer and the hard ferromagnetic FePt layer. The magnetization direction of each layer and the process of magnetization reversal are discussed in detail. The switching field dependence on the exchange coupling has been modelled by micromagnetic simulation and the interlayer coupling constant is about -0.9 erg/cm^2 according to this simulation.     

阿基米德Riesz空间的序拓扑

本文主要证明了阿基米德Riesz空间关于其序拓扑Riesz空间当且仅当其序拓扑是可缩的。     

Banach流形上映射度

本文讨论一种无限维流形上拓扑不变量，即具有可定向Ｆｒｅｄｈｏｌｍ结构的实Ｂａｎａｃｈ流形上　　Ｃｒ　　映射度．它是通常有限维流形上光滑映射度的一种自然推广．     

基于批处理的远程证明机制

针对远程证明中存在的效率问题,在现有可信计算模块(TPM)的基础上,提出了批处理方案,将短时间段内到达的请求集中进行处理,并利用Merkle树进一步减少批处理方案中通信量增长的不足.在可信移动代理服务(MAS)中的应用表明,一定时间内到达的请求越多,基于批处理的远程证明的效率提高的程度越好.     

松软煤层综放面顶底板采动应力分布规律研究

以某矿综放采场为背景,通过现场实测、相似材料模拟等手段,研究了松软煤层综放开采中液压支架受力状态、两巷单体支柱受力特征和顶底板的采动应力分布规律,结果表明液压支架在工作面不同位置受力状态不同,处于中部位置的支架受力最大,同一支架前立柱受力大于后立柱;风巷围岩应力大于机巷围岩应力,两巷的超前采动应力峰值位置在工作面前3～11m;顶板岩层同一层位中采动应力分布随工作面的距离不同而不同;不同层位应力分布也不同,离煤层越近的岩层中应力集中系数越大;底板岩层在工作面前方6m左右处应力达到最大,在工作面处应力为零。该研究结果有效地指导了该矿井同一煤层综放面巷道布置、两巷支护及工作面顶板管理。