简单零件的三维自动标注

结合零件设计,阐述了三维尺寸自动标注的必要性。传统的手工标注方法速度慢、效率低、重复性工作多。介绍了弯管和钣金2类零件的自动标注方法,阐述了在UG平台上二次开发实现三维尺寸自动标注的具体方法和步骤。     

Controllable ion exchange synthesis of Ir/Carbon catalyst

In this paper,a carbon based iridium (Ir) catalyst was prepared by an ion exchange procedure using H2IrCl6 as precursor and a strong basic anion exchange resin as substrate. The Ir/Carbon sample was obtained by carbonizing the precursor. Effects of carbonization parameters such as temperature and time on size and dispersion of iridium crystallite were studied. Samples were prepared at 400 oC and 500 oC to investigate the effect of carbonization temperature. The SEM image of the Ir/Carbon composite shows a hard particle of 0. 2 - 0. 4 mm in diameter,which maintains a spherical shape. The TEM images of the catalyst show that no obvious effects of carbonization temperature or time are observed on the iridium particle size. Calcinated Ir nanoparticles prepared in ion exchange still keep their small particle-sized and narrow-sized distribution. The content of Ir supported on carbon can be well controlled simply by adjusting the relative ratio of Ir to carbon. Such a promising synthesis procedure is a versatile approach that can be extended to the fabrication of some carbon-supported metal catalysts or as a simple,rapid,and highly sensitive method.     

基于信任关系的路由器接口标记IP追踪方案

防御拒绝服务（DDS）攻击是目前最难解决的网络安全问题之一。概率包标记（PPM）是一种比较有效且实用的解决方法。提出一种新的基于信任关系的路由器接口标记IP追踪方案（TRIM）,为不同的路由器设置不同的信任因子,划分信任域。根据信任因子确定标记概率,路由器使用接口ID对数据包进行概率标记,有效地减少重构路径时的收敛时间以及计算开销,提高路径重构的效率。在边界路由器不诚实的情况下,能够快速准确的追踪到信任域的边界。     

TJ13-3聚酯亚胺无溶剂浸渍漆在风力发电机上的应用

介绍了TJ13-3聚酯亚胺无溶剂浸渍树脂的粘度特性、常规电性能及其在风力发电机上的应用情况。应用试验表明TJ13-3聚酯亚胺无溶剂浸渍树脂是一种适合于风力发电机VPI处理的浸渍树脂。     

基于加工图的7085铝合金热成形性能研究

针对7085铝合金航空构件的热加工工艺问题,对7085铝合金在300～450℃和0.0001～1s-1条件下进行等温压缩实验,建立了7085铝合金热加工图并且分析了7085铝合金热成形性。结果表明:温度340~450℃、应变速率0.0001～1s-1为加工安全区;失稳区域为温度300～340℃、应变速率0.01～1s-1,在此区域加工时,形成绝热剪切带且带内组织为剧烈拉长晶粒;潜在危险加工区域为温度300～340℃、应变速率0.0001～0.01s-1;建议在温度340～410℃、应变速率0.0004～1s-1选择工艺参数。