离子注入法制备NiSi2层及其表面等离激元增强ZnO紫外发射的研究

通过对NiSi2的表面等离激元共振能量和ZnO/NiSi2的Purcell因子的计算,结果表明可以利用NiSi2与ZnO之间的表面等离激元耦合效应来增强ZnO的紫外发射。实验中,ZnO薄膜直接沉积在NiSi2层上,其中NiSi2层通过Ni离子注入的方法获得,并且其表面粗糙度可在3 nm到38 nm的大范围内调节,为研究表面等离激元增强ZnO紫外发射创造了有利的实验条件。在最粗糙的NiSi2层上制备的ZnO,其紫外发射获得了11倍的增强。本文的实验结果表明,NiSi2有望应用在电互联材料的同时,还可以用其来增强半导体的光发射。     

发电机残压起励的研究与实现

介绍了发电机残压起励原理及实现方法。对自并励励磁系统中用高频脉冲触发晶闸管方式进行残压起励的原理、方式及脉冲传输线路的参数设置等进行了论述。     

固相反应和离子注入制备硅化镍薄膜

采用固相反应和镍离子注入硅方法分别制备了硅化镍薄膜，利用卢瑟福背散射谱（RBS) , X射线衍射（XRD）和喇曼光谱对它们的成分和结构进行了表征. 结果表明固相反应方法中，硅化镍薄膜的相结构取决于不同的热退火条件，纯相的NiSi2薄膜需要在高温（1123K）下两步热退火才能获得. 而利用离子注入方法，则可以在较低温度（523K）下直接得到单相的NiSi2薄膜. 在30～400K范围内测量了它们的电阻率和霍尔迁移率随温度的变化关系，结果表明固相反应制备的NiSi和NiSi2薄膜都表现出典型的金属性电导行为，而离子注入制备的NiSi2薄膜则表现出完全不同的电学性质.     

架空线路的振动分析及防振措施综述

架空线路的扯动问题是电力输送中的一个重要问题，本文着重对架空线路的振动问题进行初步的分析．并对一般的防振措施进行了归纳和总结。     

MMC电容电压均衡控制系统设计及实现

保持子模块的电容电压均衡是MMC安全可靠运行的首要控制任务之一。为了简化SVM算法,利用两电平移相空间矢量调制算法实现MMC的多电平调制,假设MMC拓扑上同一级的三个半桥子模块构成一个等效的三相子模块,在α′-β′坐标系上对三相子模块进行两电平SVM调制,相邻三相子模块的参考电压采样信号移相Δθ。为了实现子模块的电容电压均衡控制,采用循环分配PWM信号的方法。并以一个桥臂级联5个半桥子模块的电路模型为例,设计控制系统,并完成实验。实验结果表明所提出的方法以及设计的系统成功实现了电容电压均衡控制,达到了预期的效果。     

聚氨酯振动筛板的研制及应用

大厂矿务局车河选矿厂1987年与河北衡水市桃城胶塑厂合作,研制聚醚型聚氨酯筛板取代铁织筛网,并在车河选矿厂进行工业试验及推广使用。寿命为铁织网的170倍,经济效果显著。     

CAD/CAE集成有限元模型转换在注射模具设计中的应用

从研究注射模具CAD/CAE的集成出发,分析了几何模型转换的不足,提出了一种采用有限元模型转换代替几何模型转换的方法.阐述了有限元模型转换相对于几何模型转换的优势,及其实现方法和途径.通过编制模型转换接口程序,成功地实现了方便快捷的有限元模型从CAD系统到CAE系统的"零失真"转换.     

Characteristics of Electrode-Water-Electrode Discharge and its Application to Water Treatment

Atmospheric air discharge above the surface of water is an effective method for water treatment.The leakage current and Joule heating of water are reduced by the air gap,which raises the energy efficiency of the water treatment.However,the application of this kind of discharge is limited by a pair of conflicting factors：the chemical efficiency grows as the discharge gap distance decreases,while the spark breakdown voltage decreases as the gap distance decreases.To raise the spark breakdown voltage and the chemical efficiency of atmospheric pressure water surface discharge,both the high-voltage electrode and the ground electrode are suspended above the water surface to form an electrode-water-electrode discharge system.For this system,there are two potential discharge directions：from one electrode to another directly,and from the electrodes to the water surface.The first step in utilizing the electrode-water-electrode discharge is to find out the discharge direction transition criterion.In this paper,the discharge direction transition criterions of spark discharge and streamer discharge are presented.By comparing the discharge characteristics and the chemical efficiencies,the discharge propagating from the electrodes to the water surface is proved to be more suitable for water treatment than that propagating directly between the electrodes.     

The Catalytic Effect of Metal Ions on the Degradation of 4-Chlorophenol Induced by an Aqueous Pulsed Discharge Plasma

The influence of metal ions, such as Fe2+ , Fe3+ , Cu2+ and Mn2+ , on 4-CP degrada- tion was investigated in an aqueous pulsed discharge plasma system with or without the addition of a TiO 2 photo-catalyst. From an analysis of the pseudo first-order rate constant (k CP ) and energy efficiency (G 50% ) for 4-CP degradation, the experimental results show that the degradation of 4-CP is much enhanced in the presence of ferrous ions at the optimal concentration of 0.2～0.8 mmol/L or 0.2 mmol/L in an aqueous pulsed discharge plasma without or with the TiO2 system, respectively, and the enhancement is ascribed to plasma induced Fenton and photo-Fenton reactions. Meanwhile, the rank of such metal ions for catalytic effect on 4-CP degradation was Fe2+ > Fe3+ > Cu2+ > Mn2+ and Fe2+ > Fe3+ > Mn2+ > Cu2+ for the former and the latter systems, respectively, and the reasons behind this were discussed through the analysis of active species, especially hydrogen peroxide.     

基于SINAMICS S120的光伏逆变器设计

介绍了当今大功率光伏并网逆变器的通用设计,并以500kW并网光伏逆变器为例,详细叙述了如何利用SINAMICSS120的硬件模块及光伏功能模块配置组态大功率并网光伏逆变器,给出了相关的试验波形。