协同作战与指挥控制技术及发展

美国海军协同作战是以共享信息化网络为基础来实现平台级和武器级的协同作战,贯穿了美国海军多兵种的联合作战或合同作战的整个始末。文中以美国海军协同作战为例,描述了协同的概念及内涵,阐述了信息化条件下协同指挥控制中的协同层次、协同模式、协同内容及关键技术,指出了协同指挥控制面临的挑战及发展重点,对发展我海军一体化协同作战装备,增强海军兵力一体化协同作战能力具有一定的参考价值。     

Theoretical Study of N_2O Adsorption and Decomposition on the InN （0001） Surface

The adsorption and decomposition of N2O on the InN (0001) surface have been explored employing density functional theory method. To study the most favorable N2O adsorption model, ten typical adsorption cases (four for the parallel style and six for the vertical style) were proposed. The calculated results indicate that the parallel models are energetically preferred over the vertical models. The parallelly adsorbed N2O prefers to be dissociated on the surface, the dissociated O atom is combined at the fcc site, and the N-N piece is desorbed from the surface and forms N2 molecules. The comparison of the density of states of InN (0001) surface before and after N2O adsorption is analyzed in detail. Through the searching for transition state of decomposition reaction, a very low energy barrier of 45.0 KJ/mol is derived.     

Adsorption of polyfunctional 5‐fluorouracil and 2,4‐dithio‐5‐fluorouracil on Au(111) surface: Structure,energy, and electronic transmission

Adsorption of 5‐fluorouracil (5‐FU) and 2,4‐dithio‐5‐fluorouracil (2,4‐DT‐5‐FU) on Au(111) surface at low coverage is studied by using periodic‐slab‐density functional theory calculation. Isolated 5‐FU molecule adsorbs preferentially at bridge site in a vertical configuration via N? H group by forming the N? H···Au nonconventional H‐bond. The formation of the anchor Au? O bond is not observed. Substitution of oxygen atoms of 5‐FU with sulfur strongly influences the nature of adsorption and leads to the Au? S anchor bond and the N? H···Au nonconventional H‐bond of single 2,4‐DT‐5‐FU molecule on Au(111) surface. The adsorption site and orientation of 2,4‐DT‐5‐FU molecule on the surface are similar to those of 5‐FU. The metal–molecule coupling effects at asymmetric Au/S(N? H)S/mol/C? H/Au and Au/N? H/mol/O/Au transport junctions and symmetric Au/S(N? H)S/mol/mol/S(N? H)S/Au and Au/O/mol/mol/O/Au transport junctions are also investigated. The electronic structure is analyzed in detail, and the obtained results are used for illustrating the electron transmission in metal–molecule–metal systems. © 2011 Wiley Periodicals, Inc. Int J Quantum Chem, 2011     

Effect of impurity (Te and Zn) incorporation in the density of defect states in thin films of Se90In10 and Se75In25 glassy alloys

In this paper we report the effect of Te and Zn incorporation on the density of defect states of two binary Se–In glassy systems. For this purpose, we have chosen here two well known Se₉₀In₁₀ and Se₇₅In₂₅ binary glassy alloys. Thin films of Se₉₀In₁₀, Se₇₅In₂₅, Se₇₅In₁₀Te₁₅ and Se₇₅In₁₀Zn₁₅ glassy alloys prepared by quenching method, were deposited on glass substrate using thermal evaporation technique. Current–voltage characteristics have been measured at various fixed temperatures in the thin films under study. Ohmic behavior was observed at low electric fields while at high electric fields current becomes superohmic. An analysis of the experimental data confirms the presence of space charge limited conduction in Se₉₀In₁₀, Se₇₅In₁₀Te₁₅ and Se₇₅In₁₀Zn₁₅ glassy alloys. It was found that the absence of space charge limited conduction in Se₇₅In₂₅ may be due to joule's heating at high fields. By applying the theory of space charge limited conduction, the density of defect states near Fermi level was calculated. The peculiar role of the additives (Te and Zn) in the pure binary Se₉₀In₁₀ and Se₇₅In₂₅ glassy alloys is also discussed in terms of electro-negativity difference between the elements involved.     

Electronic structure and magnetic properties of X2YZ (X = Co,Y = Mn,Z = Ge,Sn) type Heusler compounds: a first principle study

We performed the structure optimization followed by the calculation of electronic structure and magnetic properties on Co₂MnGe and Co₂MnSn. The structure optimization was based on generalized gradient approximation exchange correlation and full potential linearized augmented plane wave (FP-LAPW) method. The calculation of electronic structure was based on FP-LAPW method using local spin density approximation. We have studied the electronic structure and magnetic properties. The calculated density of states and band structures shows the half-metallic ferromagnets character of Co₂MnGe and Co₂MnSn.     

Fe, S共掺杂SnO2材料第一性原理分析

本文采用基于第一性原理的全电势线性缀加平面波(FP-LAPW)法, 计算了Fe, S两种元素共掺杂SnO₂材料的电子结构和光学性质. 结果表明: 材料仍为直接禁带半导体, 体系呈现半金属性; Fe, S共掺可以窄化带隙, 且随S浓度增加, 态密度向低能方向移动, 带隙减小; 共掺体系电荷密度重新分布, 随S浓度增加, Fe原子极化程度增强, 原子间键合能力增强. 共掺后介电函数虚部谱与光学吸收谱各峰随S浓度增加而发生红移, 光学吸收边减小.     

基于主动机制的防汛防旱指挥系统设计研究

为了满足主动性应用需求,引入主动信息系统原理设计防汛防旱指挥应用系统.采用扩展分层虚拟机的方法实现统一的主动机制,描述了事件与规则的定义,以及事件、规则和事务的处理方法.针对防汛防旱指挥的具体应用,给出了一种具备主动机制的防汛防旱指挥系统模型.该模型具有自动数据采集和主动实时监控、主动数据汇总与传递、主动报警和主动信息服务的能力,可以辅助决策者完成从获取信息到形成决策的大部分工作和实现主动的个性化服务.     

空基指控系统动态效能评估方法

针对目前指控系统自身特性或使命要求的不同导致系统评估有效性指标不稳定的实际,结合空基指控系统的功能、特点以及应用研究情况,以空基指控系统试飞效能数据为基础,借助兰彻斯特方程描述战争过程的广泛适用性和实时有效性,提出了一种以系统空间与使命的匹配程度为目标的动态评估模型,即把系统的运行与系统要完成的使命结合起来,根据系统在特定情况下本原的取值范围,计算系统属性空间的运行轨迹与使命所要求轨迹相符合的程度,得到对空基指控系统有效性评价总的度量.此方法能在一定程度上弥补由于使命属性选择不够合理而导致的评估差异.仿真结果验证了该方法的有效性和合理性.     

模糊相似性及D-S理论的目标识别融合方法

由于试飞环境的复杂性和噪声干扰等因素的影响,使得对空中目标的识别存在一定的不确定性,为了提高目标识别的正确率,根据传感器对目标的测量,提取的目标特征信息,依据模糊相似性测度,得到传感器报告的信任度,以信任度作为加权系数对各测量的隶属度进行加权决策,再依据D-S证据组合规则,最终得出目标识别融合的结果.给出的方法能在复杂试飞环境中有效地识别目标.基于模糊及D-S理论的目标识别融合方法具有实现简单、运算量小和识别结果可靠等优点,具有一定的理论意义和实用价值.     

以太网交换机仿真软件的研究与实现

为满足计算机网络实验室的需求,提出了一种以自主研发的交换机硬件为基础,以软件的方式仿真多种型号交换机命令的教学系统.详细描述了仿真软件的结构设计及其工作流程,并结合实际情况,提出了一种新的符号表和交换机配置数据的数据结构.给出了仿真软件的演示图.