Superfluidity of indirect excitons vs quantum Hall correlation in double Hall systems: Different types of physical mechanisms of correlation organization in Hall bilayers

Bilayer Hall systems can be divided into two groups—with and without tunneling of carriers across the barrier between layers. We demonstrate that these both classes differ in topology sense which leads to the distinct quantum Hall hierarchy. In the case of forbidden interlayer carrier tunneling we developed the Metropolis Monte Carlo simulation for an energy competition of the reentrant integer quantum Hall state against the superfluid Bose Einstein condensate of indirect excitons in double-layer 2D Hall systems, GaAs/GaAlAs/GaAs and b-graphene/hBN/b-graphene, with complementary layer filling, ${\nu }_{bot}+{\nu }_{top}=1$. The resulted phase diagrams for both systems have been determined in consistence with the experimental data.     

基于改进EAHP的装备采购供应链质量绩效评价

针对装备采购供应链质量绩效评价指标体系不能真实反映供应链质量状况和评价方法不够合理的问题,基于平衡计分卡模型框架建立了装备采购供应链质量绩效评价指标体系,提出了一种新的改进可拓层次分析法(EAHP),用于评价供应链质量绩效。该方法通过个体指标权重向量与群体指标权重向量之间的贴近度确定初始专家权重,并通过引入修正参数的序关系分析法(G1)来多轮修正专家权重分配,克服了传统EAHP在群决策中集结专家判断信息后一致性检验难以通过的问题。计算实例表明该方法能有效集结群决策信息,并减少偏差较大的决策信息带来的不良影响。     

一种基于同步传输机制的混合保护方式研究

随着同步数字体系（SDH）多业务平台的日趋发展,传统的SDH保护方式已无法满足现在的需要。提出了一种混合保护方式,在同一个环内实现子网连接保护和两纤双向复用段保护,可实现对高阶和低阶业务的同时兼顾,解决SDH多业务平台的保护问题。该方法在实践中取得了良好的效果。     

Rogue waves in the massive Thirring model

In this paper, general rogue wave solutions in the massive Thirring (MT) model are derived by using the Kadomtsev–Petviashvili (KP) hierarchy reduction method and these rational solutions are presented explicitly in terms of determinants whose matrix elements are elementary Schur polynomials. In the reduction process, three reduction conditions including one index- and two dimension-ones are proved to be consistent by only one constraint relation on parameters of tau-functions of the KP-Toda hierarchy. It is found that the rogue wave solutions in the MT model depend on two background parameters, which influence their orientation and duration. Differing from many other coupled integrable systems, the MT model only admits the rogue waves of bright-type, and the higher order rogue waves represent the superposition of fundamental ones in which the nonreducible parameters determine the arrangement patterns of fundamental rogue waves. Particularly, the super rogue wave at each order can be achieved simply by setting all internal parameters to be zero, resulting in the amplitude of the sole huge peak of order N being $2N+1$ times the background. Finally, rogue wave patterns are discussed when one of the internal parameters is large. Similar to other integrable equations, the patterns are shown to be associated with the root structures of the Yablonskii–Vorob'ev polynomial hierarchy through a linear transformation.     

一个新的非等谱可积族和一些相关对称

利用李群$M_nC$的一个子群我们引入一个线性非等谱问题,该问题的相容性条件可导出演化方程的一个非等谱可积族,该可积族可约化成一个广义非等谱可积族.这个广义非等谱可积族可进一步约化成在物理学中具有重要应用的标准非线性薛定谔方程和KdV方程.基于此,我们讨论在广义非等谱可积族等谱条件下的一个广义AKNS族$u_t=K_m(u)$的$K$对称和$\tau$对称.此外,我们还考虑非等谱AKNS族$u_t=\tau_{N+1}^l$的$K$对称和$\tau$对称.最后,我们得到这两个可积族的对称李代数,并给出这些对称和李代数的一些应用,即生成了一些变换李群和约化方程的无穷小算子.