电磁换向阀的卡死故障诊断

本文将提出一种直流电磁换向阀故障诊断的新方法。它利用线圈电流在启动或复位过程中的变化特征，来判断阀芯是否卡死，并且分析产生此故障的原因。此方法简单、实用、快捷，为直流电磁换向阀故障诊断技术开辟了新的途径。     

Properties and Microstructuresof Three Kinds of Silversheathed Bi-2223 Tapes

ＰｒｏｐｅｒｔｉｅｓａｎｄＭｉｃｒｏｓｔｒｕｃｔｕｒｅｓｏｆＴｈｒｅｅＫｉｎｄｓｏｆＳｉｌｖｅｒｓｈｅａｔｈｅｄＢｉ－２２２３ＴａｐｅｓＺｅｎｇＲｏｎｇ；ＺｈｏｕＹｉｒｕ；ＹｅＢｉｎ；ＺｈｏｕＭｉｎ；ＺｈａｎｇＪｉａｎｇｕｏ（曾荣）（周贻茹）（叶斌）...     

涡流检测信号小波除噪与缺陷特征提取

应用小波分析技术进行涡流检测的信号除噪和缺陷识别。根据信号在不同小波变换下表现形式不同的特点，提出一种综合应用多种小波除噪的方法，效果优于通常的单一小波方法。应用小波多尺度边缘检测功能进行缺陷的定位和尺寸判别。借助小波多尺度分析功能，可以对缺陷信号进行仔细分析，并对相近缺陷进行分类。     

渗碳材料涡流测试系统的研究

以通用有限元分析软件ANSYS作为二次开发平台，开发了面向渗碳材料的涡流测试系统。该系统将有限元前处理、涡流电磁场计算、渗碳层深度逆问题求解及计算结果的可视化处理结合起来，提供了良好的用户界面。     

An experimental evaluation of the effects of ripple current generated by the power conditioning stage on a proton exchange membrane fuel cell stack

In this article, an impedance model of the proton exchange membrane fuel cell stack (PEMFCS) is proposed. The proposed study employs an equivalent circuit of the PEMFCS derived by the frequency response analysis technique. An equivalent circuit for the PEMFCS is developed to evaluate the effects of ripple currents generated by the power-conditioning unit. The calculated results are then verified by means of experiments using a commercially available PEMFCS. The relationship between ripple current and fuel cell performance, such as power loss and fuel consumption, is investigated. Experimental results show that the ripple current can contribute up to a 6% reduction in the available output power. This paper was presented at the Fuel Cells: Materials, Processing, and Manufacturing Technologies Symposium sponsored by the Energy/Utilities Industrial Sector & Ground Transportation Industrial Sector and the Specialty Materials Critical Technologies Sector at the ASM International Materials Solutions Conference, October 13–15, 2003, in Pittsburgh, PA. The symposium was organized by P. Singh, Pacific Northwest National Laboratory, S.C. Deevi, Philip Morris USA, T. Armstrong, Oak Ridge National Laboratory, and T. Dubois, U.S. Army CECOM.     

铝合金牺牲阳极电流效率损耗的微观分析

探针（EPMA）和能谱分析技术(EDAX)，考察了铝合金牺牲阳极的显微结构和腐蚀后的边缘形貌，讨论了电流效率和显微组织之间的关系.结果表明：晶界腐蚀引起的晶粒脱落是铝合金牺牲阳极电流效率损耗的重要原因.      

THEORETICAL INVESTIGATION ON BY-ONLY-CURRENT ELECTROMAGNETIC SEPARATION OF INCLUSION FROM MOLTEN METALS

The electromagnetic field under applied AC and DC current in round and rectangular pipe was systematically investigated, then a concept of "equivalent current density" was proposed for evaluating the inhomogeneous electromagnetic pinch force, and the mono-component removal efficiency and the overall removal efficiency of inclusion were formulated. It is founded that flat pipe is superior to round pipe for the electromagnetic removal of inclusion, and DC current can get a higher removal efficiency than A C current due to absence of skin phenomenon. Under usual condition, a removal efficiency of 52% for 10μm inclusion or more than 92% for 20μm inclusion can be achieved by imposing a current density of 3×106A/m2 in a flat pipe.     

高纯Fe中氢损伤规律的研究

本文采用正电子湮没技术研究了高纯Fe中的氢损伤规律,实验结果表明,在0.5mol/L H_2SO_4溶液中不加毒化剂电解充氢时,产生氢损伤的临界电流密度为20 mA/cm~2;而在0.5mol/L H_2SO_4溶液中加少量As_2O_3作为毒化剂电解充氢时,即使很小的电流密度也会产生氢损伤,配合慢拉伸试验,还发现试样内部产生氢损伤以后,它将控制随后的形变和断裂过程     

涡流检测技术在宝钢热轧轧辊上的应用

介绍了轧辊涡流检测仪的工作要求、设备组成和使用方法,指出对轧辊进行涡流检测可防止爆辊,减少轧辊磨削量。     

TiO_2直接电解还原过程的研究

采用SEM、EDS、XRD等方法对TiO2直接电化学还原产物进行分析,指出TiO2电极的还原是从外向内由高价到低价再到金属逐步进行的。对还原过程中电流、还原气相产物的分析结果表明:还原过程电流效率低,并且电流效率随电解时间延续而降低,阳极产物CO、CO2与阴极中间产物Ca发生副反应以及副反应产物炭黑造成电流短路是电流效率低的主要原因。提高电流效率的途径有两条:一是增大阴、阳极间距,减小副反应的发生;二是使电解池表面熔盐不断导出,或采取某一隔离措施,使副反应产生的炭黑在阴、阳极之间不造成电流短路。