Sakai网络教学平台统一身份认证中心的实现

通过对统一身份认证的实现机制分析和对Sakai网络教学平台的研究,以及根据Session的运行特点,以Sakai工具的开发方法为Sakai平台设计并实现了一个统一身份认证中心,并同时实现了各种常用程序语言的统一身份认证接口,使之可以对各种语言编写的外部应用系统均可以提供统一身份认证服务,实现资源的整合和集成。     

ON MILIN-LEBDEV INEQUALITIES

Let \[\varphi (x) = \sum\limits_{k = 1}^\infty {{A_k}} {x^k},\Phi (x) = {e^{\varphi (x)}} = \sum\limits_{k = 1}^\infty {{D_k}} {x^k}\] \[\begin{gathered} \frac{1}{{{{(1 - x)}^\lambda }}} = \sum\limits_{k = 1}^\infty {{d_k}} (\lambda ){x^k} \hfill \ {\overline \Delta _n}(\lambda ) = {\lambda ^{2 - p}}\sum\limits_{k = 1}^\infty {{k^{p - 1}}} \mathop {|{A_k}|}\nolimits_{}^p - \sum\limits_{k = 1}^\infty {\frac{1}{k}} \hfill \\ \end{gathered} \] Milin-Lebedey proved that \[\sum\limits_{k = 0}^\infty {\frac{{|{D_k}{|^p}}}{{d_k^{p - 1}(\lambda )}}} \leqslant \exp \{ {\lambda ^{1 - p}}\sum\limits_{k = 1}^\infty {{k^{p - 1}}} |{A_k}{|^p}\} \] where p>l and \[\lambda \]>0. In this paper, we have proved the following theorems； Theorem 1. Let \[p \geqslant 1,\lambda > 0\] and \[F(x) = \sum\limits_{k = 0}^\infty {\frac{{|{D_k}{|^p}}}{{d_k^p(\lambda )}}} {x^p}\exp \{ - {\lambda ^{1 - p}}\sum\limits_{k = 1}^\infty {{k^{p - 1}}|{A_k}{|^p}{x^k}} \} (2)\] then F(x) is a decreasing function of x on [0, 1]. This theorem is stronger than the result (1). Theorem 2. Let \[p \geqslant 2,\lambda > 0\] and \[{{\bar Q}_n}(\lambda ) = \frac{1}{{n + 1}}\sum\limits_{k = 0}^n {\frac{{|{D_k}{|^p}}}{{d_k^p(\lambda )}}\exp } \{ - \frac{1}{{n + 1}}\sum\limits_{v = 1}^n {\overline {{\Delta _p}} } (\lambda )\} \] then \[{{\bar Q}_n}(\lambda )\] is a decreasing fimctLon of n(n=l, 2，...)In the case p=2 this is contained in the Miiin-Lebedev's result.     

电子战系统试验与训练数据的不确定性问题

针对信息不完全、不清晰及不断变化等不确定性问题,分析了电子战系统试验与训练(简称试训)数据不确定性的内涵,提出了试训数据不确定性问题的研究框架体系,介绍了试训数据不确定性的主要研究内容并总结了试训数据不确定性的数学研究方法.研究结论为利用不确定性理论分析解决电子战系统试训数据处理问题提供了理论支撑.     

一类带有捕食者阶段结构的滞后型捕食食饵模型的Hopf分支

本文研究了一类带有阶段结构和Ho1lingⅢ型滞后函数响应的捕食食饵模型的稳定性和Hopf分支的问题.利用微分动力系统的标准型和中心流形定理,获得了内平衡点局部稳定和周期解的方向性,推广了文献[4]所得出的结论.     

高性能保偏光纤的关键应用特性研究

开发出一种高性能保偏光纤的制造工艺,并制备出包层直径为80μm的细径高性能保偏光纤。试验表明：该光纤具有优良的全温（-50℃～85℃）偏振串音性能,光纤全温串音变化典型值在3．23dB,具有良好抗弯曲性能和良好的端面研磨性。     

Community detection using global and local structural information

Community detection is of considerable importance for understanding both the structure and function of complex networks. In this paper, we introduced the general procedure of the community detection algorithms using global and local structural information, where the edge betweenness and the local similarity measures respectively based on local random walk dynamics and local cyclic structures were used. The algorithms were tested on artificial and real-world networks. The results clearly show that all the algorithms have excellent performance in the tests and the local similarity measure based on local random walk dynamics is superior to that based on local cyclic structures.     

Boson bound states in the β-Fermi–Pasta–Ulam model

The bound states of four bosons in the quantum β-Fermi–Pasta–Ulam model are investigated and some interesting results are presented using the number conserving approximation combined with the number state method. We find that the relative magnitude of anharmonic coefficient has a significant effect on forming localized energy in the model, and the wave number plays an important role in forming different bound states. The signature of the quantum breather is also set up by the square of the amplitudes of the corresponding eigenvectors in real space.     

ZnAl2O4的电子结构及光学性质的第一性原理计算

采用基于密度泛函理论的第一性原理方法对ZnAl2O4的能带结构、态密度、布居分布及光学性质进行了理论计算。结果表明:ZnAl2O4为直接带隙半导体,能带宽度为3.91 eV;价带主要由O2p态和Zn3d态构成,导带主要由Al3s,3p态构成;ZnAl2O4为离子和共价兼有的化合物;并利用计算的能带结构和态密度分析了ZnAl2O4材料的复介电函数,光电导率,折射率以及消光系数等光学性质。且静态介电函数ε1(0)=3.35,静态折射率n0=1.83。     

硫的取代对基态硫代乙酸单分子解离反应影响的理论研究

应用B3LYP方法,结合6-31G**、cc-pVDZ、aug-cc-pVDZ和cc-pVTZ基组对硫代乙酸的两种异构体CH3C(O)SH和CH3C(S)OH在基态势能面上的9个单分子反应进行了研究。本文计算预测硫代乙酸主要以CH3C(O)SH的形式存在,两种异构体均以顺式构象为优势构象。通过对比CH3C(O)SH、CH3C(S)OH和 CH3C(O)OH的反应性差异,我们可以得出结论：CH3C(O)OH中-OH基团的O被S取代后,只有当-SH作为一个整体参加反应时才对分子解离过程有较大影响;而C=O或C=S对反应性影响较小。     

双层材料光热偏转光谱的定量研究

从三线传热方程出发,给出了双层材料的光热偏转光谱的理论模型,讨论了光热偏转信号的特征及其在扫描成象应用中的意义.