基于HLA的军机协同作战分布交互仿真系统

首先对基于 HLA 的合同作战演练仿真系统进行了介绍和分析,分析了系统的结构组成、FOM/SOM 的开发,在分析 HLA 编程难点的基础上,对程序的开发和接口的封装进行了研究,最后进行了总结。     

光纤麦克风系统

本文介绍了一种光纤麦克风系统。提出了原理,工艺设计,系统结构及其物性。     

Probabilistic D-Clustering

We present a new iterative method for probabilistic clustering of data. Given clusters, their centers and the distances of data points from these centers, the probability of cluster membership at any point is assumed inversely proportional to the distance from (the center of) the cluster in question. This assumption is our working principle. The method is a generalization, to several centers, of theWeiszfeld method for solving the Fermat–Weber location problem. At each iteration, the distances (Euclidean, Mahalanobis, etc.) from the cluster centers are computed for all data points, and the centers are updated as convex combinations of these points, with weights determined by the above principle. Computations stop when the centers stop moving.     

Number crunching vs. number theory: computers and FLT,from Kummer to SWAC (1850–1960), and beyond

The present article discusses the computational tools (both conceptual and material) used in various attempts to deal with individual cases of FLT, as well as the changing historical contexts in which these tools were developed and used, and affected research. It also explores the changing conceptions about the role of computations within the overall disciplinary picture of number theory, how they influenced research on the theorem, and the kinds of general insights thus achieved. After an overview of Kummer’s contributions and its immediate influence, I present work that favored intensive computations of particular cases of FLT as a legitimate, fruitful, and worth-pursuing number-theoretical endeavor, and that were part of a coherent and active, but essentially low-profile tradition within nineteenth century number theory. This work was related to table making activity that was encouraged by institutions and individuals whose motivations came mainly from applied mathematics, astronomy, and engineering, and seldom from number theory proper. A main section of the article is devoted to the fruitful collaboration between Harry S. Vandiver and Emma and Dick Lehmer. I show how their early work led to the hesitant introduction of electronic computers for research related with FLT. Their joint work became a milestone for computer-assisted activity in number theory at large.     

设备-高层结构-地基土体系交互计算方法

提出了模拟设备-高层结构-地基土体系振动台实时子结构试验的数值交互计算方法,并且结合地基土在强震作用下并非全部进入非线性的特点,认为可尝试将具有局部非线性特点的地基土模型作为数值子结构、设备-高层结构体系作为试验子结构,从而在振动台实时子结构试验中考虑地基土非线性特性影响。采用分支模态子结构法与线性-非线性混合约束模态子结构法推导了设备-高层结构-局部非线性地基土体系的运动方程。选用一幢13层钢框架设备-高层结构-地基土体系模型作为分析实例,采用MATLAB与ANSYS分别建立设备-高层结构体系与局部非线性地基土计算模型,两者之间进行数值交互计算,发现土-结构相互作用与设备的频率变化对设备与结构的地震反应有重要的影响。     

加工工艺对鸡酥松脂肪氧化的影响

为研究加工工艺对鸡酥松加工过程脂肪氧化的影响,考察蒸煮时间、蒸煮温度、炒松时间对2-硫代巴比妥酸值的影响,分析炒松工艺对鸡酥松脂肪氧化以及综合评分的影响,结果表明,炒松时间显著影响脂肪氧化,加工工艺中对脂肪氧化影响程度由大到小依次为炒松时间、蒸煮温度和初煮时间,而影响产品综合评估得分的因素由强至弱依次为炒松时间、初煮时间和蒸煮温度;优化后较适的加工工艺条件为初煮50min、复煮10min、蒸煮温度90℃、炒松时间20min、2-硫代巴比妥酸作用底物值为2.26mg/kg。产品综合评分与2-硫代巴比妥酸作用底物值的趋势并不完全吻合,鸡酥松加工过程中的工艺影响脂肪氧化程度和产品品质。     

不同基片生长γ'-Fe4N薄膜的结构及其磁学性能

采用直流磁控溅射方法, 保持氩气流量不变, 控制氮气的体积分数为10%,125%,15%, 分别用Si（100）单晶和SrTiO₃（100）单晶基片制备Fe N薄膜. 用X射线衍射(XRD)和振动样品磁强计(VSM)等方法对两种不同基片生长Fe N薄膜的结构及磁学性能进行表征. 结果表明: 在SrTiO₃（100）单晶基片上得到了单相γ′-Fe₄N薄膜, 与Si（100）基片上的样品相比, SrTiO₃（100）更有利于诱导γ′-Fe₄N薄膜的取向性生长; 当氮气的体积分数约为12.5%时, 制备单相γ′-Fe₄N薄膜的晶粒结晶度较好, 且饱和磁化强度较高, 矫顽力比Si（100）为基片获得的Fe N薄膜样品低, 软磁性能较好.     

广义S-型模李超代数的结构

通过确定元素形式较简单多项式代数的理想,得到了除幂代数、外代数和多项式代数作张量积的结合超代数理想以及广义模李超代数■的理想,进而给出广义模李超代数■的非单性及■限制李超代数的充要条件.     

基于布谷鸟搜索算法参数优化的组合核极限学习机

针对单核极限学习机在泛化性能上存在一定局限性的问题, 提出将再生核函数与多项式核函数相结合, 建立一种新的组合核极限学习机模型, 使其具有全局核与局部核的优点, 并选择布谷鸟搜索算法对其参数进行优化选择. 仿真实验结果表明, 采用基于再生核的组合核函数作为极限学习机的核函数可行, 在实验数据集的多值分类和回归问题上, 与传统支持向量机及单核极限学习机相比, 该模型具有更好的泛化性能.