Experimental investigation on anti-penetration performance of polyurea-coated ASTM1045 steel plate subjected to projectile impact

In this study, the anti-penetration performance of polyurea/ASTM1405-steel composite plate subjected to high velocity projectile was analyzed. Two kinds of modified polyurea material (AMMT-053 and AMMT-055) were selected and a ballistic impact testing system including speed measuring target system and high-speed camera was designed. This experiment was conducted with a rifle and 5.8 mm projectile to explore the effects by the polyurea coating thickness, the polyurea coating position and the glass-fiber cloth on the anti-penetration performance of polyurea/ASTM1405-steel composite plate. The result showed that the effects of polyurea coating position were different between two types of polyurea, and that the effects of glass-fiber position were disparate between two types of polyurea as well. For AMMT-053 polyurea material, it was better to be on front face than on rear face; whereas for AMMT-055 pol-yurea, it was better to be on rear surface although the difference was very subtle. Additionally, formulas had been given to describe the relationship between the effectiveness of polyurea and the thickness of polyurea coating. In general, AMMT-055 had better anti-penetration performance than AMMT-053. Furthermore, five typical damage modes including self-healing, crack, local bulge, spallation and local fragmentation were defined and the failure mechanism was analyzed with the results of SHPB test. Additionally, the bonding strength played an important role in the anti-penetration performance of polyurea/steel composite plate.     

军队高校创造性思维教育的几个问题

简述了创造性思维教育的意义与目的,辨析了有关概念,提出了创造性思维教育的前提,详细讨论了创造性思维教育的有关措施.     

灰色数列预测应用分析

对灰色理论与统计分析在装备经济管理工作中的实用性分别以模型机理、模型数据处理复杂性和模型结果精度三方面进行了比较分析,着重指出在某些情况下灰色模型具有小样本而精度高的特点,并列举了实例加以说明．     

混响和噪声环境下基于角度谱的多声源定位与计数算法

针对混响及噪声环境下的多声源定位与计数问题,引入局部信噪比追踪及相关性检测模块,提取出传统广义互相关角度谱中受噪声及声源互扰影响较小的时频支撑域;同时引入双宽度匹配追踪方法替代传统的峰值搜索,改进后续定位与计数的精确度。仿真研究验证了综合应用滤波后的角度谱及双宽度匹配追踪的多声源定位与计数算法相比传统算法在较低信噪比、较强混响以及较多声源数的环境中更加精确及稳健。     

The value of information sharing in a two‐stage supply chain with production capacity constraints

We consider a simple two‐stage supply chain with a single retailer facing i.i.d. demand and a single manufacturer with finite production capacity. We analyze the value of information sharing between the retailer and the manufacturer over a finite time horizon. In our model, the manufacturer receives demand information from the retailer even during time periods in which the retailer does not order. To analyze the impact of information sharing, we consider the following three strategies: (1) the retailer does not share demand information with the manufacturer; (2) the retailer does share demand information with the manufacturer and the manufacturer uses the optimal policy to schedule production; (3) the retailer shares demand information with the manufacturer and the manufacturer uses a greedy policy to schedule production. These strategies allow us to study the impact of information sharing on the manufacturer as a function of the production capacity, and the frequency and timing in which demand information is shared. © 2003 Wiley Periodicals, Inc. Naval Research Logistics, 2003     

按照《纲要》要求在"三个紧贴"中扎实做好经常性思想工作

按照<纲要>要求在"三个紧贴"中扎实做好经常性思想工作,必须充分认识"三个紧贴"对于做好经常性思想工作的重要意义,准确把握"三个紧贴"的本质要求,在"动中抓建"中落实"三个紧贴".     

无产阶级军事家与“高树勋运动”的兴起

毛泽东、朱德、邓小平等无产阶级军事家对“高树勋运动”在解放战争时期的兴起作出了各自的贡献：邓小平通过做争取高树勋的统战工作,为“高树勋运动”兴起创造出实践经验,树立起实践典型;毛泽东发出“开展高树勋运动”的号召,要求全军广泛“开展高树勋运动”;朱德则把“高树勋运动”提高到符合历史规律的理论高度作出肯定。     

《装备采购质量监督国家军用系列标准》分析

本文对23个装备采购质量监督国家军用标准进行了系统分析,特别是对相互引用及引用其他标准的情况进行了梳理,形成了系统、清晰的引用关系图。找出了系列标准中存在的部分问题,并提出了完善系列标准的建议。     

弹药传爆点火冗余设计技术应用

针对弹药或其他类子弹药在传爆及延期点火要求,设计了当子弹引信作用并输出爆轰波后,子弹实现快速传爆并按预定要求实现多级延期点火的一种火工装置,其结构采用了冗余设计方法,具有作用可靠性高、延期时间精度好及点传火性能稳定等优点,该装置属弹药火工品技术领域。本文还描述了此装置的结构设计及其作用原理,建立了工作过程的物理模型,并给出了试验结论。为类似子弹药传爆、延期功能方案设计及工程研制提供了一种有效的技术途径。     

基于剩余价值的编队舰空导弹防空综合 效能准则研究

编队舰空导弹的火力运用与效能准则有着紧密的联系。为了合理而有效地运用舰空导弹火力,在对防空效能准则分析的基础上,提出了一种基于编队剩余价值的综合防空效能准则,建立了概率型和确定型两种效能准则模型。分别在两种防御模式下和两种攻击模式下,对确定型综合防空效能准则下作战时间与编队剩余价值的关系进行了仿真计算和分析。基于剩余价值的防空综合效能准则采用“逆向思维”来评定防空作战效能,能够反映防空作战实际情况,指导编队舰空导弹的火力运用。