基于组合度量的应急救援网络路由算法研究

针对AODV协议只选用跳数最小进行选路的缺陷,提出一种新的基于组合量度的路由协议(AMAODV)。该协议综合考虑路由的跳数、节点间链路的有效期和可用带宽3种因素,通过层次分析的方法判定上述3种因素对链路传输的影响,提出了组合度量函数,借助组合度量函数的计算来选择一条具有较小度量值的路径进行传输。仿真结果表明:AMAODV协议在适应高速移动的网络环境上具有一定优势,并能降低网络时延和增加网络吞吐量。     

Energy Band-gap Calculation of d-Ta2O5 Using sX-LDA and B3LYP Methods

The energy band-gap and related factors of tantalum pentoxide with hexagonal phase were investigated using hybrid functional B3 LYP and s X-LDA methods. The results showed that both s X-LDA and B3 LYP techniques reveal the indirect semiconductor nature of δ-Ta2O5, whereas the obtained value of energy band-gap is much higher than previous theoretical reports but closer to the experimental data. The optical bandgap of δ-Ta2O5 is expected to originate from the O 2p→Ta 5d transition which may benefit from the d-s-p hybridization.     

面向大学生心理问题分析的数据挖掘应用

当前已经进入大数据时代,数据挖掘是在大量的数据中提取有用的有价值的知识。本文结合高校学生心理测试产生的数据,采用ID3算法构造决策树分析预测大学生心理健康状况,为学校的心理辅导工作提供参考依据。     

基于SoC的多轴驱控一体化平台设计

随着FPGA技术和电力电机技术的发展,FPGA+ARM的集成方式已经成为FPGA的发展方向.针对一体化多轴运动控制与驱动的特点,选用了集成双核ARM CPU与FPGA结合的Xilinx Zynq-7020全可编程System-on-chip(SoC)作为硬件平台,一个ARM CPU完成多轴的位置环、速度环和电流环的算法以及多轴轨迹生成,能同时完成伺服高级算法如谐振等,另一个ARM CPU完成交互功能,发挥FPGA高速运算的功能,完成6轴电流环流水线控制以及双采样双更新电流环算法.提高了系统整体带宽,实现多轴ns级同步精度以实现更精确的位置轨迹,驱控一体内部数据通过共享内存以及高速内部总线的方式进行交换,其传输速度更快、传输信息更加丰富.     

不同晶相结构ZrO2负载铜基催化剂用于二乙醇胺脱氢反应

通过制备不同晶相结构〔单斜相(m-ZrO_2)、四方相(t-ZrO_2)和无定型(a-ZrO_2)〕ZrO_2载体,再通过沉积沉淀法制得Cu/m-ZrO_2、Cu/t-ZrO_2和Cu/a-ZrO_2催化剂,分别用于催化二乙醇胺脱氢合成亚氨基二乙酸反应。采用XRD、氮气物理吸附脱附、XPS、H_2-TPR、CO_2-TPD对催化剂的结构进行了表征。结果表明,Cu/m-ZrO_2催化剂界面更加有利于Cu~+/Cu~0稳定存在,具有更多的碱性位点,且抗氧化性较好。在二乙醇胺脱氢反应中,Cu/m-ZrO_2催化剂性能最好,反应时间为2.5 h,亚氨基二乙酸收率为97.64%。     

一起6kV厂用电母线PT保险熔断事故的原因分析及解决方案

以某机组因一台磨煤机单相接地故障引起机组非停为例,分析了导致6 kV厂用电母线PT三相保险熔断的原因。通过查阅行业反措要求及相关规程,提出了解决方案,对6 kV PT装置进行了改造。改造完成后,没有发生过PT保险熔断事故,改造效果明显。     

Room Temperature Ferromagnetism in Co-doped CuAlO2 Nanofibers Fabricated by Electrospinning

One-dimensional, diluted magnetic semiconductor nanofibers have attracted increasing attention for their unique magnetic properties, large specific surface area, and high porosity. These qualities lead to excellent performance in magneto-optical devices, magnetic resonance imaging, ferrofluids and magnetic separation. The purpose of this study is to fabricate P-type one dimensional CuAlO2-based diluted magnetic semiconductor nanofibers. First, we fabricated Cu Al0.95Co0.05O2 nanofibers with an average diameter of 1 μm with the electrospinning method. The annealed nanofibers were thermally treated at a temperature of 1 100 ℃ and then shrunk to a diameter of about 650 nm. We used X-ray diffraction measurements and Raman spectra to confirm that the Cu Al0.95Co0.05O2 nanofibers had a single impurity free delafossite phase. The X-ray photoelectron spectroscopy analysis indicates that Co was present in the +2 oxidation state, resulting in an room temperature ferromagnetism in the Cu Al0.95Co0.05O2 fiber. This contrasts with nonmagnetism in pristine CuAlO2 fiber. The coercivity(Hc) value of 65.26 Oe and approximate saturation magnetization(Ms) of 0.012 emu/g demonstrate good evidence of ferromagnetism at room temperature for Cu Al0.95Co0.05O2 nanofibers.     

小半径缓和曲线钢板组合梁整体顶推技术

近年来,在山区桥梁设计中越来越多的应用了钢板组合梁。因此,以某工程为例,其采用钢板组合梁,桥梁平面位于小半径圆曲线及缓和曲线上,场地受限,仅能采用顶推工艺,因此总结了小半径缓和曲线钢板组合梁整体顶推技术要点,从而为类似工程提供一定借鉴。     

一起400 V站用交流系统事故分析及防范措施

介绍了一起400 V站用交流系统合环短路事故，分析了事故原因，提出了防范措施，为电网安全运行积累经验。