团簇Ti3P2成键及催化活性

为进一步了解团簇Ti3P2的成键性质和催化活性,利用密度泛函理论在B3LYP/Lanl2dz水平下引入极化基,利用拓扑学原理对团簇进行优化,得到较稳定的7种构型进行轨道杂化的分析和研究。得到以下结论:构型1(1)是稳定构型中能量最低,其结构最稳定的;团簇Ti3P2各稳定构型中不同原子间的成键强度与效果各不相同,其中Ti-P键成键强度最大,并且对团簇Ti3P2的稳定性影响也很大;在总态密度及分波态密度图中可以发现d-p杂化和p-d-p杂化均引起Ti-P键的生成,和成键键级比例结论一致;团簇Ti3P2中各原子对HOMO和LUMO轨道的贡献存在差异,同时也为其催化反应提供了良好的条件。     

团簇Ni3CoP催化性质的前线轨道研究

以团簇Ni_3CoP为模型,从前线轨道的角度对非晶态合金Ni-Co-P的催化性质进行研究。发现团簇Ni_3CoP各构型中不同原子对其前线轨道均有不同程度的贡献,且Ni原子的贡献最大,说明Ni原子最有可能作为团簇Ni_3CoP潜在的催化准活性位点;分析各构型的能隙差,发现团簇Ni_3CoP中唯一的戴帽三角锥型5(1)的能隙差最小,在化学反应中可能具有较强的反应活性;分析团簇Ni_3CoP各构型的态密度图,发现团簇Ni_3CoP作为催化剂在催化反应过程中具有较强的提供电子的能力,但同时其接受电子的能力也不能忽视,说明团簇Ni_3CoP是十分优良的催化剂。     

半环类■°I中成员的性质和结构

利用半环上的同余关系,研究了半环类.■°I中成员的性质.分别研究了半环类.O∩■°■B和■∩■°■中成员的次直积分解,并利用"(2,2)型代数的坚固构架"的概念,证明了半环S∈■°■l是■与■l中成员的次直积当且仅当S的乘法半群是群与半格的次直积.     

浅谈虚拟局域网技术与校园网

本文就虚拟局域网的工作原理作了介绍，并针对某校园网虚拟局域网的解决方案进行了分析。     

虚拟化技术在网络课程实验教学环节中的应用

为了解决目前网络课程实验教学环节中存在的问题,本文分析了采用各种虚拟化技术的软件,针对网络课程中局域网、网络设备配置及网络协议分析相关实验的设计和应用.     

竞争量子进化算法的巡航导弹航路规划与重规划方法

针对巡航导弹航路规划问题,提出了一种竞争量子进化算法(CQEA),算法通过双方向进化及自适应变异避免其陷入局部最优解。同时,鉴于航路重规划对实时性的高度要求,借助最小威胁曲面及搜索竖线将三维搜索空间降到一维,并引入功能区域簇初始化思想来保证初始种群皆为非劣个体,从问题的几何本质上提升航路重规划效率。最后利用CQEA算法进行了航路规划与重规划仿真实验,结果表明,与PAQEA相比,CQEA搜索效率更高,稳定性更好;与原三维搜索空间相比,通过削减搜索空间及引入功能区域簇初始化思想后算法搜索速率更快,符合航路重规划对实时性的高度要求。     

Coordination game model of co-opetition relationship on cluster supply chains

The research of cluster supply chains is a new direction and a hotspot of the industrial cluster theory. On the condition of the coordination game, the enterprises may be stuck on the non-efficient equilibrium status, which becomes an important problem that must be considered on cluster supply chains. A symmetrical coordination game model is constituted to describe the competition and cooperation relationship of the same-quality manufacturers on cluster supply chains. The methods of the non-cooperation game theory and the evolutionary game theory are respectively used to analyze the model, whose parameters＇ influences under each method are then compared. It can be concluded that the analysis of the evolutionary game theory is more realistic and practical. Finally, three approaches are considered to break away from being path-dependence locked-in non-efficient status during this coordination game evolutionary process, which provide the development of cluster supply chains with an effective forecasting and Pareto optimizing method.     

基于聚簇的大规模虚拟试验实体分配策略研究

在大规模虚拟试验中,能否为数量众多的试验实体合理指定其所在的宿主机将直接影响系统性能.针对现有实体分配算法大都以线性聚簇策略为主,不适用于大规模松耦合的试验环境,提出了一个较为系统性的细粒度实体分配理论.在网络仿真实时性理论指导下,建立了实体交互图EIG,定义了虚拟试验系统的实体粒度.提出了大规模试验中非线性聚簇的实体划分策略,并证明了细粒度下非线性聚簇要优于线性聚簇.该实体分配理论对实体聚合算法的选取和分配方案的评价都具有指导意义.     

Link reliability based hybrid routing for tactical mobile ad hoc network

Tactical mobile ad hoc network （MANET） is a collection of mobile nodes forming a temporary network, without the aid of pre-established network infrastructure. The routing protocol has a crucial impact on the network performance in battlefields. Link reliability based hybrid routing （LRHR） is proposed, which is a novel hybrid routing protocol, for tactical MANET. Contrary to the traditional single path routing strategy, multiple paths are established between a pair of source-destination nodes. In the hybrid routing strategy, the rate of topological change provides a natural mechanism for switching dynamically between table-driven and on-demand routing. The simulation results indicate that the performances of the protocol in packet delivery ratio, routing overhead, and average end-to-end delay are better than the conventional routing protocol.