“领头羊”陈坤学

“金满堂,银满仓,金银花开显吉祥;民兵好,民兵强,民兵就是领头羊”。这是时下流传在贵州安龙县大水井村的苗族小调。这首小调不仅唱出了大水井村人对美好生活的欣喜,更唱出了对民兵指导员陈坤学的赞美。 大水井村位于南盘江畔,村民住的是权杈房,盖的是茅草顶,吃的是救济粮,解决温     

TDS-OFDM雷达通信共享信号波形设计

在使用正交频分复用(Orthogonal Frequency Division Multiplexing, OFDM)信号的雷达通信一体化系统中,循环前缀(Cyclic Prefix, CP)和导频的存在,使得共享信号在自相关运算中出现较高的副瓣电平,严重影响雷达检测性能。针对这个问题,提出一种新的基于时域同步OFDM(Time Domain Synchronization OFDM, TDS-OFDM)的共享信号形式,该信号利用训练序列填充保护间隔,同时完成同步与信道估计,从而避免了CP副瓣和导频副瓣的出现。首先分析TDS-OFDM共享信号的模糊函数,然后通过训练序列的优化设计,有效降低TDS-OFDM信号的距离峰值副瓣,同时保持训练序列自身良好的自相关性能。理论分析与仿真表明,相对于CP-OFDM,TDS-OFDM共享信号更加适用于雷达通信一体化系统。     

基于BPMN的作战视图辅助设计方法

体系结构设计在C4ISR系统开发中越来越受到重视.由于目前体系结构设计主要是依据DOD体系结构框架,体系结构产品是框架最基本的表现形式,因此,体系结构产品设计是体系结构设计中的一个关键问题.在深入研究BPMN的基础上,提出了基于BPMN的作战视图辅助设计方法,建立了企业过程图与作战视图产品OV5、OV6的转换关系.     

网络中心作战体系效能评估问题

网络中心作战体系效能评估问题是网络中心战研究领域的重要问题.阐述了该问题的研究内容,分析了网络中心作战体系效能评估的概念及特点,概述了研究网络中心作战体系效能评估的基本问题:作战效能产生机制、评估指标体系、评估方法和评估工具等,为进一步研究该问题提供了一个参考体系.最后,提出一个基于探索性建模与分析方法的网络中心作战体系效能评估框架.     

Mechanical stress and deformation analyses of pressurized cylindrical shells based on a higher-order modeling

In this research, mechanical stress, static strain and deformation analyses of a cylindrical pressure vessel subjected to mechanical loads are presented. The kinematic relations are developed based on higherorder sinusoidal shear deformation theory. Thickness stretching formulation is accounted for more accurate analysis. The total transverse deflection is divided into bending, shear and thickness stretching parts in which the third term is responsible for change of deflection along the thicknes...     

Assessment of the ballistic response of honeycomb sandwich structures subjected to offset and normal impact

In the present study, experimental and numerical investigations were carried out to examine the behavior of sandwich panels with honeycomb cores. The high velocity impact tests were carried out using a compressed air gun. A sharp conical nosed projectile was impacted normally and with some offset distance(20 mm and 40 mm). The deformation, failure mode and energy dissipation characteristics were obtained for both kinds of loading. Moreover, the explicit solver was run in Abaqus to create the fin...     

An energetic nano-fiber composite based on polystyrene and 1,3,5-trinitro-1,3,5-triazinane fabricated via electrospinning technique

Electrospinning is a simple technique used to fabricate polymeric nano-fibrous membranes. These nano-fibers have found a wide range of valuable applications in the biomedical field. However, it has not been utilized with solid high explosives yet. Herein, the electrospinning technique has been used to fabricate polystyrene(PS)/1,3,5-trinitro-1,3,5-triazinane(RDX) composite nanofibers. The governed electrospinning parameters, voltage, distance from the collector, flow rate, mandrel rotating speed...     

CPN在海上防空建模中的应用

着色 Petri网 (CP-网或 CPN )是一种面向图形的语言 ,用来设计、说明、模拟和验证系统。尤其适用于通信系统等同步和资源共享占有重要地位的系统。在通信协议、分步式系统、嵌入系统、自动生产系统、工作流分析、VL SI芯片等方面都有典型的应用。本文简单介绍了 CPN的发展过程和基本原理 ,重点就 CPN在海上防空系统建模仿真中的应用进行了探讨     

马边县人武部立足特点抓整组

四川马边彝族自治县人武部结合民族地区特点,抓好民兵整组工作。 他们在整组中搞好三个结合:一是把民兵整组工作与学习江主席“三个代表”重要思想相结合。利用民兵整组时机,带领民兵预备役人员积极参加地方经济建设,扶贫帮困、扶贫助教;二是把民兵整组工作与人武部机关作风纪律教育整顿相结合。注