直流电弧炉的偏弧现象与控制

伴随着直流电弧炉的大型化和超功率化,直流电弧炉出现了偏弧问题,这限制了直流电弧炉能力的发挥。本文研究和分析偏弧现象并结合发达国家的DC电弧炉的实例阐述了抑制和控制偏弧现象的方法及手段。     

广钢60t直流电弧炉热调试及生产概况

本文回顾广钢60t电炉选型及热调试的情况,并对生产概况进行分析.一年的生产情况表明,60t炉的选型是对的,热调试是成功的,生产的情况是良好的,最高日产23炉,最高班产9炉,最高月产3.23万吨,达到了设计能力.     

基于云计算的桥梁安全与健康监测数据中心基础架构及其数据管理技术

桥梁安全监测数据信息以几何级数速度增长,对数据中心海量数据存储、管理提出了智能化、高效率化的要求.分析了桥梁安全与健康监测数据中心的数据管理技术及发展趋势;阐述了基于云计算（Cloud Computing）的数据中心基础架构;深入探讨了关键设备和软件的选型;对基于云计算的桥梁安全监测数据中心的应用前景进行了展望.     

能量过滤磁控溅射技术制备ITO薄膜及其特性研究

采用磁控溅射(DMS)和能量过滤磁控溅射(EFDMS)技术在玻璃衬底上制备ITO透明导电薄膜。利用扫描电子显微镜、原子力显微镜、X射线衍射、紫外-可见分光光度计、四探针电阻仪、椭偏光谱仪等对薄膜的性能进行表征和分析,初步探讨了EFDMS技术的成膜机理。研究发现与DMS技术相比,EFDMS技术可有效降低薄膜的表面粗糙度,并且薄膜光电性能有一定改善。     

直流磁控溅射铝纳米颗粒膜的微结构及电学特性

采用直流磁控溅射法,以高纯铝(99.99%)为靶材,高纯氩气(99.999%)为起辉气体,在经机械抛光的单晶Si衬底上制备铝纳米颗粒薄膜。利用X射线衍射仪(XRD)、光学薄膜测厚仪、扫描电子显微镜(SEM)和四探针测试仪分别测试了铝纳米颗粒薄膜的晶相结构、薄膜厚度、表面形貌及电阻率。XRD衍射图谱表明此薄膜为面心立方的多晶结构,择优取向为Al(111)晶面。随溅射功率由30 W增至300 W,铝纳米颗粒薄膜的沉积速率由3.03 nm/min增加至20.03 nm/min;而随溅射压强由1 Pa增加至3 Pa,沉积速率由2.95 nm/min降低到1.66 nm/min。在溅射功率为150 W,溅射压强为1.0 Pa条件下制备的样品具有良好的晶粒分布。随溅射功率从80 W增大到160 W,样品电阻率由4.0×10-7Ω·m逐渐减小到1.9×10-7Ω·m;而随溅射压强从1 Pa增至3 Pa,样品电阻率由1.9×10-7Ω·m增加到7.1×10-7Ω·m。     

Multimodal medical image fusion based on discrete Tchebichef moments and pulse coupled neural network

Multimodal medical image fusion plays a vital role in clinical diagnoses and treatment planning. In many image fusion methods‐based pulse coupled neural network (PCNN), normalized coefficients are used to motivate the PCNN, and this makes the fused image blur, detail loss, and decreases contrast. Moreover, they are limited in dealing with medical images with different modalities. In this article, we present a new multimodal medical image fusion method based on discrete Tchebichef moments and pulse coupled neural network to overcome the aforementioned problems. First, medical images are divided into equal‐size blocks and the Tchebichef moments are calculated to characterize image shape, and energy of blocks is computed as the sum of squared non‐DC moment values. Then to retain edges and textures, the energy of Tchebichef moments for blocks is introduced to motivate the PCNN with adaptive linking strength. Finally, large firing times are selected as coefficients of the fused image. Experimental results show that the proposed scheme outperforms state‐of‐the‐art methods and it is more effective in processing medical images with different modalities. © 2017 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 27, 57–65, 2017     

Fabrication and Properties of DC Magnetron Sputtered Indium Tin Oxide on Flexible Plastic Substrate

Indium tin oxide (ITO) thin films deposited on flexible polyethylene terephthalate (PET) substrates at low temperature by DC magnetron sputtering from an In-Sn (90-10 wt pct) alloy target were studied. The correla-tion between deposition conditions and ITO property was systematically investigated and characterized. These as-deposited ITO films were used as the anode contact for flexible organic light-emitting diodes (FOLEDs). The fabricated FOLEDs with a structure of PET/ITO/NPB (50 nm)/Alq (20 nm)/Mg:Ag (100 nm) showed a maximum luminance of 2125 cd/m2 at 13 V.     

AlGaInP/GaAs异质结双极晶体管直流特性研究

制备了大尺寸AlGaInP／GaAs SHBT和DHBT，对其直流特性进行了测试，并分析了AlGaInP／GaA。单异质结晶体管(SHBT)和双异质结晶体管(DHBT)的直流特性差异，深入研究了影响AlGaInP／GaAsHBT开启电压(Voffset)的各个因素。结果表明：AlGaInP／GaAsHBT开启电压与外加基极电流密切相关，采用宽发射区可大大降低器件的开启电压。     

三相无刷直流电机调速系统的仿真

给出基于Matlab/Simulink三相无刷直流电机调速系统实用仿真模型,为系统中电机本体优化设计及电子器件参数合理选择提供重要依据。     

DC/DC升压变换器自抗扰控制

本文设计了一种线性自抗扰控制器,直接对DC/DC升压变换器的电感电流实施控制,以抑制系统非最小相位特性时控制性能的影响.在此基础上,外环采用一个PI控制器对输出电压进行控制,并把电压控制器的输出作为内环电感电流控制的参考输入.由于自抗扰控制器则是一种不依赖丁系统模型的控制方法,因此被控系统不但具有良好的动态特性,而且对...