Research About Microstructure and Wear Resistance of Hardfacing Layer on Cast Iron

It's simple technology to manufacture big trimming die by hardfacing on the base metal of cast iron. The chemical composition, microstructure, hardness, wear resistance and wear mechanism of the hardfacing layer were studied.The experimental results indicate that the hardfacing technology has much more advantages and cheaper than that of traditional process. The chemical composition, microstructure, hardness of the hardfacing metal are all satisfied for manufacturing the big trimming die by welding on cast iron. The wear resistant test of hardfacing layers were carried out by using two different electrodes. The wear resistance of new electrode hardfacing layer is higher than that of normal hardfacing electrode D322. The wear mechanism of hardfacing layer is belongs to abrasive wear model.     

镀锡板镀锡量检测分析仪

为了精确测量镀锡板的镀锡量，提高镀锡板生产和进口的质量，用稀盐酸作电解液，根据电解剥离原理，采用微分电位法，解决了各层界面自动分层难题，研制出镀锡板镀锡量检测分析仪。仪器以Cygnal F005单片机作为智能部件，既可提供本机显示和打印测量结果的功能，又能通过USB接口与上位机配合使用。对双电层电容充电电流引起的测量误差作了修正。仪器小型轻便，操作界面友好。     

任意层互连生产技术研究

任意层互连（ELIC）是最高阶的高密度连接（HDI）制程，它可以比传统线路在层数相同的情况下，增加约30%层间互连；随着移动通讯产品功能需求的增加，ELIC技术被大举应用在智能手机及平面电脑等产品上。高阶ELIC线路板的生产不但流程长，且生产难度较大。本文对ELIC板的制作难点进行了分析，并提出相应的解决方法和生产注意事项，为ELIC工艺产业化提供必要的参考依据。     

基于粗波分复用技术的LTE-CRAN光缆网设计

为缓解LTE网络建设压力,转变机房式基站建设模式,CRAN技术正式投入使用。CRAN模式下,BBU集中部署,远端RRU拉远,实现快速建站目标,但同时星型的端到端组网模式对传送网资源需求达到前所未有的高度。为缓解传送网压力,提升纤芯使用效率与组网合理性,引入粗波分复用技术对传送网配线与纤芯应用模式做出革新,最终实现了光缆网网络能力的本质提升,为LTE-CRAN模式的拓展提供了坚实的基础。     

对蒙脱石层电荷的测定

介绍了蒙脱石矿物晶格的层表面积、层电荷的概念；蒙脱石晶层中单价交换阳离子所占据的面积及层电荷的确定方法，并对不同种方法进行了比较。指出了在蒙脱石改性工艺中，研究蒙脱石层电荷的重要性。     

Improving of Micro Porous Layer based on Advanced Carbon Materials for High Temperature Proton Exchange Membrane Fuel Cell Electrodes

This work reports the study of four different carbon materials for their application as carbon material in microporous layers for high temperature proton exchange membrane fuel cells electrodes. The microporous layers were prepared with carbon black (a commercial one, Vulcan XC72), two different carbon nanofibers, CNF, (Ribbon and Platelet structure) and carbon nanospheres, all of them prepared in our lab. The microporous layers were characterized by XRD. The hydrophobicity, electrical conductivity, and permeability to different gases were also evaluated. The stability is an important issue to be overcome in the field of proton exchange membrane fuel cells. Thus, accelerated thermal and electrochemical degradation tests in phosphoric acid media were carried out to evaluate the stability of the different advanced materials tested under the same conditions. From all the performed essays, the carbon nanospheres were the best nano‐carbon materials because of the lower degradation degree shown by the microporous layer prepared with them and the good conductivity and permeability achieved, whereas CNF with a Platelet structure showed a low electrochemical stability due to their greater edge plane exposure which favors their corrosion.     

基于集对分析的空袭作战方案决策模型

基于集对分析理论,提出空袭作战方案的评价模型。通过建立待评估方案决策矩阵,构造理想方案。运用层次分析法确定评价指标权重,形成待评估方案和理想方案联系矩阵。对各项指标值与其相应权重系数线性叠加合成,以同一度大小对备选方案排序选优,为空袭作战方案的选优提供简单、实用的评价方法。     

烷基季铵盐改性膨润土的膨胀性

用X射线衍射(XRD)、傅立叶红外光谱(FT-IR)和热重(TG)表征方法,考察了四甲基溴化铵(TMAB),四乙基溴化铵((Et)4NB),十二烷基三甲基溴化铵(DTAB),十六烷基三甲基溴化铵(CTAB)对膨润土膨胀性的影响。结果表明,不同季铵盐都已吸附到膨润土晶层间,短链季铵盐TMAB和(Et)4NB主要以单分子平躺在膨润土晶层之间,使膨润土的层间距比原土样降低,有很好的防膨作用。长链季铵盐DTAB和CTAB以假三层平卧、倾斜排列等方式排列,使膨润土的层间距比原土样增加,没有防膨作用。且膨润土对(Et)4NB和TMAB的吸附量低于DTAB和CTAB的。     

高速摄影法研究铅芯延期体的燃烧特性

用高速摄影仪对卡在透明塑料管中的铅芯延期体从点火到喷火的过程进行了拍摄.图像显示,在铅芯延期体点火端有一段延期药与点火药头一起在很短的时间内完成燃烧过程;在铅芯延期体喷火端有一段延期药被喷出,铅芯延期体未起延期作用.将燃烧后的铅芯延期体沿药芯切开,显微镜下观察残渣,发现有的残渣呈层状龟裂.根据结果,对这些影响铅芯延期精度的因素进行了分析.