LED充电台灯产品质量安全风险监测分析

近年来带锂离子电池的可移动式LED充电台灯引发爆炸、起火、燃烧等质量安全事件时有发生,为充分了解该类产品的质量状况,确保消费者的生命财产安全。本文选取了电商平台上销售的30批次样品进行试验、分析和评估,结果显示:样品存在标记缺失、结构不合格、耐热不合格、电池外部短路不合格等质量安全风险。依据国家相关的风险评估标准,将该类产品不同的监测项目应进行风险等级评划分,并针对风险等级程度对产品的质量提升要求提出了相关处置建议。     

冶金企业面临的严峻局面及今后工作重点

阐述了冶金企业在当前的严峻形势下，要求得生存必须转变传统观念。并提出“九五”期间的工作重点是：节能降耗、调整品种结构、提高生产率及加强决策管理。重点论述了实现节能降耗应抓好的四项工作：连铸坯一火成材与热装直轧，轧钢炉窑节能技术，轧机主传动交流调速技术及控制冷却技术。     

关于半精纺工艺特点与纺纱生产技术要点

根据2006年在青岛召开的“全国创新型毛纺半精纺工艺技术研讨会”上讨论的几个热点问题整理成文,介绍了半精纺工艺的特征,分析了半精纺工艺在我国得以快速发展的原因,指出了半精纺纱线的应用领域及市场前景,并对如何纺好半精纺纱线,提高半精纺纱线质量提出了建议。     

不完备信息系统的规则提取研究*

粗糙集理论和D-S证据理论都是重要的不确定性推理方法,两者各有优缺点.现实生活中,不完备信息系统广泛存在.研究了将两种理论结合用于不完备信息系统以进行规则提取,并用实例进行了验证.     

基于马尔科夫链模型的小金川河流域径流形势预估分析[ 国家重点研发项目资助（2018YFB0905204）]

为了分析小金川河流域中长期径流形势,本文尝试利用马尔科夫链模型进行年径流形势预估,结合历史径流的丰枯变化,计算丰水年、平水年、枯水年相互转变的马尔科夫转移概率,在此基础上,可根据当年来水情况实现对木坡电站下一年径流形势的预估分析。以2018年木坡电站的丰枯形势预估为例,经验证,该径流形势预估分析方法具有较强的实用性,为径流形势预估分析提供了一种切实可行的思路和方法。     

智能变电站二次安全措施危险点分析

为保证智能变电站继电保护和安全自动装置现场安全作业,主要采用投入检修态硬压板,退出保护装置软压板、智能终端出口硬压板以及断开物理光纤等安全隔离措施。以线路停电检修为例,从设备之间的电流电压采样、跳合闸(包括远跳)、启动失灵等信息联系出发,重点分析影响运行设备的危险点及可能导致的结果。根据各种危险点分析总结出适用的二次安全措施,完成检修装置与运行装置的可靠隔离,对运行维护人员提炼总结二次安全措施具有参考意义。     

Toward Largely Enhanced Toughness and Balanced Strength in PA1012/EPDM Blends via Synergistic Effect of Sacrificial Bonds and Network Structure

Here, zinc-neutralized ethylene propylene diene monomer (EPDM) ionomers with different neutralization levels are prepared through melt blending, and are then incorporated with polyamide 1012 (PA1012) to fabricate PA1012/EPDM ionomer blends. Interestingly, complex crosslinking networks are formed in the blends due to the construction of sacrificial bonds (Zn²⁺-carboxyl, Zn²⁺-amide). The as-formed network structure and sacrificial bond endow the PA/EPDM blends with largely enhanced toughness (16 times higher than that of neat PA), as well as balanced strength and stiffness. Meanwhile, the rheological behaviors of PA1012/EPDM ionomer blends indicate their relative low melting viscosity, which can avoid the processing shortcomings of plastics toughened with rubber. Moreover, PA1012/EPDM ionomer blends show obvious gelation behavior, and a maximum notched Izod impact strength exhibited at the gel point, in which unique double network structure can be observed obviously, indicating that there is a corresponding correlation between the rheological and mechanical parameters. Furthermore, the supper-toughening mechanism of PA1012/EPDM ionomer blends at gel point is explored, which origins from the large deformation and cavitation of rubber particles and the destruction of special double network morphologies. This study provides a novel and effective strategy to fabricate PA materials with outstanding toughness and excellent strength simultaneously.     

逆向工程中的一种编号点及其识别方法

对机械逆向工程中运用到的一种点的编码方式进行了简单的阐述和特征化，并详细介绍了运用区域搜索进行目标分割以及运用查找特性表并结合矩不变量的一种识别的算法。     

A composite numerical scheme for the numerical simulation of coupled Burgers’ equation

In this work, a composite numerical scheme based on finite difference and Haar wavelets is proposed to solve time dependent coupled Burgers’ equation with appropriate initial and boundary conditions. Time derivative is discretized by forward difference and then quasilinearization technique is used to linearize the coupled Burgers’ equation. Space derivatives discretization with Haar wavelets leads to a system of linear equations and is solved using Matlab7.0. Convergence analysis of proposed scheme exhibits that the error bound is inversely proportional to the resolution level of the Haar wavelet. Finally, the adaptability of proposed scheme is demonstrated by numerical experiments and shows that the present composite scheme offers better accuracy in comparison with other existing numerical methods.     

基于组播的LFMCW雷达显示系统设计与实现

基于组播传输机制设计并实现了雷达系统网络结构,定义了各种显控协议报文的数据结构以及与之相关的组播地址。针对数据报文中的极坐标数据,提出了一种基于三维优化查找表算法的坐标转换方法。对转换过程中的漏点和重点等问题进行了有效解决,并分析了组播在实现多屏显示和在综合船桥系统中的扩展优势。最终系统通过QT绘制界面,在以XC6SLX100T和DAVINCI DM3730为基础的硬件平台上完成了实际测试,验证了系统的可行性。