基于案例决策理论的仿真任务共同体服务选择算法

资源分配优化是面向服务（ SOA）的大型多用途仿真系统的关键问题，而含有不确定状态或效果的服务选择是资源分配优化中的一个难点。针对以上问题，提出了构建仿真任务共同体的方法，基于案例的决策理论（ CBDT）的思想，设计了一种不确定型仿真任务共同体服务选择算法（ CBDSSA）。算法通过服务选择案例相似度的层次化运算，生成相似历史案例集，计算得到相似历史案例的方案效用值，最终评估出目标服务选择方案综合效用值并排序备选。算例验证表明，算法约束条件少，层次结构分明，运算结果直观，为仿真任务共同体服务选择问题提供了一种新的思路和实践手段，对大型多用途仿真系统资源分配优化研究具有一定的参考价值。     

Theoretical calculation and experimental study on the interaction mechanism between TKX-50 and AP

The combination of 5,5′-bistetrazole-1,1′-diolate (TKX-50) and ammonium perchlorate (AP) can make greater use of the chemical energy of TKX-50 based energetic materials. The research on the interaction mechanism between TKX-50 and AP is very important for designing TKX-50-AP compounds and judging the formation feasibility of composite particles, which can lay a theoretical foundation for the preparation of TKX-50-AP mixed crystals and the application of TKX-50 in propellant, propellant and explosive. Herein, in order to research the interaction mechanism between TKX-50 and AP, density-functional theory calculation was applied to optimize three configurations of TKX-50-AP compounds. The geometry structure, electrostatic potential and binding energy of the compounds were predicted, and the electronic density topological analysis was also carried out. Then TKX-50-AP mixed crystals structures were constructed, and the radial distribution function of H–O and H–N in mixed crystals was calculated. Finally, solvent/non-solvent method was applied to prepare TKX-50-AP composites, and the infrared spectroscopy and the non-isothermal decomposition performance of the composites were characterized. Results show that the superposition of positive charges in TKX-50 molecule and negative charges in AP makes the electrostatic potential distributions of TKX-50-AP compounds different from that of TKX-50 and AP. The interaction energies of TKX-50-AP 1, TKX-50-AP 2 and TKX-50-AP 3 are 39.743 kJ/mol, 61.206 kJ/mol and 27.702 kJ/mol, respectively. The interaction between TKX-50 molecules and AP molecules in TKX-50-AP mixed crystals both depends on hydrogen bonds and van der Waals force, and the number and strength of hydrogen bonds are significantly greater than that of van der Waals force. The composition of AP and TKX-50 makes the absorption peak of the five-membered rings and NH₃OH⁺ of TKX-50 shift to low wavenumber in the infrared spectroscopy. In general, TKX-50 interacts with AP via hydrogen bonds and van der Waals force, and the calculated results are in good agreement with the experimental results. The composition of TKX-50 and AP can also prolong the decomposition process.     

金属磁记忆信号表征铁磁材料变形的基础研究

为探索利用金属磁记忆技术进行再制造毛坯质量控制的方式方法,制作了18CrNiWA钢退火处理和调质处理的板状静载拉伸试件,在MTS810型液压饲服试验机上进行了拉伸试验,采用EMS2003金属磁记忆仪检测拉伸过程试件表面磁记忆信号变化,并利用OLYMPUSGX51观察了2种热处理状态的金相组织。研究结果表明:轴向拉伸载荷诱发试件产生磁有序状态,磁信号曲线在弹性和塑性变形阶段内呈现不同分布特征,磁曲线斜率Ks可以表征拉应力导致的变形程度;2种试件微观组织不同导致拉伸过程中呈现不同的力磁效应。     

基于阶次小波包与粗糙集的轴承故障诊断

针对齿轮箱启动过程中振动信号表现为非平稳、非高斯特征及传统诊断方法诊断精度不高的现状,将阶次小波包和粗糙集理论引入轴承的故障诊断中,提出了一种新的故障诊断方法。首先利用阶次跟踪算法对瞬态振动信号进行重采样,得到等角度分布振动信号,其次采用小波包对该信号分解—重构,并对每个频段的能量进行归一化,构成特征向量,通过粗糙集理论得到清晰、简明的决策规则,最后通过故障实例验证该方法的有效性。     

Constant risk aversion in stochastic contests with exponential completion times

This article analyzes a class of stochastic contests among multiple players under risk‐averse exponential utility. In these contests, players compete over the completion of a task by simultaneously deciding on their investment, which determines how fast they complete the task. The completion time of the task for each player is assumed to be an exponentially distributed random variable with rate linear in the player's investment and the completion times of different players are assumed to be stochastically independent. The player that completes the task first earns a prize whereas the remaining players earn nothing. The article establishes a one‐to‐one correspondence between the Nash equilibrium of this contest with respect to risk‐averse exponential utilities and the nonnegative solution of a nonlinear equation. Using the properties of the latter, it proves the existence and the uniqueness of the Nash equilibrium, and provides an efficient method to compute it. It exploits the resulting representation of the equilibrium investments to determine the effects of risk aversion and the differences between the outcome of the Nash equilibrium and that of a centralized version.© 2016 Wiley Periodicals, Inc. Naval Research Logistics 66:4–14, 2019     

论石鲁根植于传统文化的中国画绘画笔墨辨证观

以中国传统文化思想为切入点，从墨色关系、虚实关系和“多少、繁简”关系三个方面探讨石鲁中国画画论中的笔墨观，得出石鲁的笔墨观不但根植于中国传统文化，又融合了唯物辨证法思想和二十世纪中国绘画新成果．由微见著说明石鲁的中国画绘画思想来源于中国传统文化与唯物辨证法及现代绘酒成果的结合。     

中国维和警察特色理论研究

中国维和警察特色理论是中国维和警察学科理论体系基本框架的重要组成部分。对中国维和警察特色理论的概念、主体、特征、范畴进行了探讨，以构建中国维和警察特色理论的基本框架，为中国维和警察学科理论体系研究奠定坚实基础。     

基于约束条件的海上机动目标位置长期预测模型

海上目标运动模型已经有很多,但是对海上机动目标位置的长期预测问题还没有得到很好的解决。灰色系统理论是解决时间序列问题的有效工具,将其与海上机动目标的运动特点相结合,可以较准确地预测海上机动目标在未来较长时期内的位置分布,为引导卫星搜索海上机动目标提供理论依据。     

一种面向多制式路径规划的网络模型

随着综合交通运输与导航应用技术的发展,综合利用多种交通方式实施路径规划的应用需求日益迫切,传统的单一制式路径规划系统与服务正在向多制式的方向发展.然而,传统的路径规划模型与算法难以直接应用在多制式的条件下.针对多制式路径规划的特点,构建合理的数据模型是解决该问题的基础.为此,提出了制式切换点的概念,并以此为基础建立了包含多制式图集合、顶点属性表和切换点矩阵三个主要部分的多制式网络模型,并在真实的城市道路网数据集上进行了多制式网络构建实验.该工作能够从理论和实践两个方面为多制式路径规划算法的设计提供基础性的技术支持.     

理想气体绝热过程的微观实质

从分子动理论出发,建立理想气体绝热过程的微观模型,用麦克斯韦速度分布函数导出其过程方程.