电热毯火灾模拟与微观形貌分析方法研究

通过模拟电热毯在各种条件下工作并引起火灾的过程,制备出不同形貌特征的电热丝,然后分别用体式显微镜和扫描电子显微镜观察电热丝表面的宏观和微观形貌,通过比较和分析其火灾痕迹特征,鉴别出电热毯在火灾发生前的工作状态,为电热器具火灾原因的准确认定提供依据,并提出一种新的鉴定技术——微观形貌法。     

无动力逃生梯部分替代疏散楼梯的可行性研究

从无动力逃生梯的工作原理、自身优点、疏散能力和产品造价等方面与安全疏散楼梯进行比较,对无动力逃生梯部分替代疏散楼梯的可行性进行了深入分析和探讨,最后得出可以根据建筑的消防安全疏散的实际情况部分替代疏散楼梯。     

谈提高警卫人员礼仪修养的必要性及途径

无论是执行外宾警卫任务还是首长警卫任务,警卫人员都会在警卫对象出现的相关场合经常性的“露脸”。警卫人员的礼仪修养将直接体现中国的文明程度,同时也直接影响首长在人民群众中的形象,提高警卫人员的礼仪修养刻不容缓。     

新疆喀什地区泽普县维族双语教师汉语水平调查研究

教师的水平制约着教育的发展,双语教师在双语教育中起着重要作用。本文对新疆喀什地区泽普县维族双语教师的汉语水平进行实地调研,找出他们汉语水平存在的问题,并针对问题提出建议。     

辐射叶加载的短波宽带鞭状天线优化设计

提出一款具有多层辐射叶结构的新型鞭状天线,在10 m鞭状天线体上设置不同的辐射叶层数、半径、长度、分支数、仰角及其分布情况,研究其对天线辐射性能的影响,综合考虑选择一套最合适的辐射叶结构,并为天线进行双加载和宽带匹配网络的算法优化。仿真结果表明,与现有的普通宽带鞭状天线相比,增益和效率得到了普遍提高,在低频段增益最高提高了3 dB,效率最高提高了5%;在高频段增益最高提高了5 dB,效率最高提高了35%,方向图上翘也得到了一定的抑制,为改善现有的宽带鞭状天线提供一种新的结构设计方法。     

第19届国际信息融合会议及获奖论文评述

总结了第19届国际信息融合会议的总体情况和主要特点,通过对大会报告、分会场报告以及国际信息融合界一些著名专家团队发表论文情况的统计分析,提炼出国际信息融合界普遍关注的焦点和难点问题;通过对获奖论文的分析,了解到受大会评奖委员会一致认可的年度优秀成果和技术进步点;最后,面向高层信息融合中的不确定性处理,对信息融合领域的发展进行展望。     

小型汽油发电机组智能式电子调速系统方案设计

汽油机调速性能是影响小型汽油发电机组电气性能指标的重要因素。目前,使用机械式转速调整装置的小型汽油机的转速调整率较大,从而严重影响了小型汽油发电机组电气性能。提出了基于PIC单片机智能式数字步进电机调速系统去解决小型汽油发电机组中汽油机转速稳定性问题,给出了调速系统详细硬件和软件设计方案。该方案经实际验证是可行的。     

简述防雷方法

本文介绍防雷装置的组成及各部分的作用、要求;阐述常规防雷的三种方法和非常规防雷的几种防雷形式。     

Fragment spatial distribution of prismatic casing under internal explosive loading

Non-cylindrical casings filled with explosives have undergone rapid development in warhead design and explosion control. The fragment spatial distribution of prismatic casings is more complex than that of traditional cylindrical casings. In this study, numerical and experimental investigations into the fragment spatial distribution of a prismatic casing were conducted. A new numerical method, which adds the Lagrangian marker points to the Eulerian grid, was proposed to track the multi-material interfaces and material dynamic fractures. Physical quantity mappings between the Lagrangian marker points and Eulerian grid were achieved by their topological relationship. Thereafter, the fragment spatial distributions of the prismatic casing with different fragment sizes, fragment shapes, and casing geometries were obtained using the numerical method. Moreover, fragment spatial distribution experiments were conducted on the prismatic casing with different fragment sizes and shapes, and the experimental data were compared with the numerical results. The effects of the fragment and casing geometry on the fragment spatial distributions were determined by analyzing the numerical results and experimental data. Finally, a formula including the casing geometry parameters was fitted to predict the fragment spatial distribution of the prismatic casing under internal explosive loading.     

Effects of jute fibre content on the mechanical and dynamic mechanical properties of the composites in structural applications

Due to notable characteristics, sustainability concept and environmental issues, hybridisation natural with synthetic fibres to fabricate composites have been rapidly gaining market share in different applications (structural, military, aerospace and automotive vehicles). Compression, tension and fatigue tests of various stacking sequences of plain jute/carbon reinforced (PVB) polyvinyl butyral by hot hydraulic press technique were experimentally conducted. Six types of fabricated composites with various constituents (jute, carbon and their hybrids) were fabricated and tested. Notably, fatigue lifetime of hybrids increases with increasing the carbon content relative to the jute fibre content. On the other hand, Jute composites possess high strain compared to pure carbon composite, which gives an overall improvement in mechanical behaviours. Interestingly, H1 hybrid with Carbon/Jute/Carbon sequences offers similar fatigue stiffness behaviour of H3 hybrid with Carbon/Jute/Carbon/Jute sequences when subjected to cyclic loading. Carbon composite (C) exhibited the highest fatigue resistance, whiles jute composite (J) possessed the highest strain and semi brittle trends in both mechanical and fatigue performance. Results concluded that plain jute fibres could partially replace high-cost synthetic carbon fibres to produce more eco-friendly hybrids to be utilised in different composites industries.