雷电流监测装置安装位置对测量结果的影响分析

为了了解实际雷电流的波形参数,需在高塔或输电线路等构筑物上对雷电流波形进行监测,但实际测量到的结果是受构筑物影响后的雷电流。笔者主要讨论雷电流监测装置安装位置对于监测结果的影响。在构筑物模型中考虑了雷电流传播过程中的衰减、畸变以及冲击接地电阻等的因素,采用电磁暂态分析程序对不同高度的构筑物进行仿真计算。分析结果表明,构筑物在不同安装位置处得到的雷电流差别很大,顶部监测到的电流受到的影响很小,底部监测到的雷电流受到的影响非常大,雷电流测量设备应当安装在构筑物顶部,这样测量到的雷电流参数比较准确。     

火电厂电气监控系统间隔层通信的现状与发展

对火电厂电气监控系统间隔层设备的通信接口方式及通信协议进行了介绍,并指出了其特点及发展方向。     

大型冶金成套设备合作制造模式的现状分析与改进方案

根据我国大型钢铁企业"十五"、"十一五"期间从国外引进了大批先进的冶金技术和成套设备,其中国内有加工能力的重要设备均采用"联合设计、合作制造"的引进方式。结合武钢最近十几年来引进设备的实践经验,对传统合作制造模式在实际操作过程中出现的各种利弊通过实例进行详细分析研究,分析研究的结果为弊大于利,并研究提出了一种改进型的合作制造模式,经过试用效果良好,值得在冶金及其它行业企业的设备采购系统推广应用。     

山东省某测井公司放射工作人员职业健康状况分析

分析了山东省某测井公司放射工作人员职业健康检查结果。结果表明:(1)放射工作人员的血压异常率与年龄、工龄有关,随着年龄、工龄的增加而增高,差异显著;(2)不同年龄段间比较,肾功能异常率差异显著;(3)不同工龄段间比较,胸部X射线摄影异常率差异显著。结论认为,从事测井工作的放射工作人员长期接触低剂量辐射,应提高防护意识,...     

e-Automation,an architecture for distributed industrial automation systems

Due to the complexity of modern industrial systems, a conventional automation system is not capable of providing sufficient information management and high-level intelligent approaches, as achieving these functionalities requires the support of comprehensive data management and coordination between system devices and heterogenous information. This paper proposes the concept of e-Automation, in which computer networking and distributed intelligence agent technologies are applied to industrial automation systems, and presents a hardware and software architecture that implements this concept. An open infrastructure based on multi-agent systems is employed in the proposed architecture of e-Automation, which aims to allow the implementation of diverse tasks and to permit greater configurability than can be obtained from a traditional system. To evaluate our proposed e-Automation concept, this paper presents a case study of substation information management which adopts the proposed e-Automation architecture in power system domain.     

剖面浮标变体积油囊式浮力调节系统设计

为精准控制剖面浮标的垂向运动,提出一种可精确控制油量的变体积油囊式浮力调节系统,包含外油囊、增压油箱、密封性能良好的电磁球阀和可调节转速的液压泵等组件。采用拉线位移传感器实时采集增压油箱液面位置实现油量监控,并对外油囊体积进行高精度闭环反馈控制;设计极低泄漏量的液压系统,实现系统在待机状态下浮力保持长期稳定。为精确控制浮力调节系统,构建控制系统数学模型,引入比例积分微分（Proportional Integral Differential,PID）控制算法,并采用Simulink进行稳定性仿真。试验结果表明,系统可实现浮力精确控制,最大超调量低于1%,稳定性与响应速度均符合预期,验证了控制策略的可靠性。     

炸药乳化器安全监测方法及其发展

文章回顾了几种现行的乳化器安全运行检测方法,分析了各自的优缺点,介绍了一种使用现代振动监测诊断技术对乳化炸药生产线的关键设备乳化器进行在线安全监测的基本原理和功能,讨论了乳化器安全监测系统的发展方向.     

Maximum-likelihood mixture factor analysis model and its application for process monitoring

In the present paper, a mixture form of the factor analysis model is developed under the maximum-likelihood framework. In this new model structure, different noise levels of process variables have been considered. Afterward, the developed mixture factor analysis model is utilized for process monitoring. To enhance the monitoring performance, a soft combination strategy is then proposed to integrate different local monitoring results into a single monitoring chart, which is based on the Bayesian inference method. To test the modeling and monitoring performance of the proposed mixture factor analysis method, a numerical example and the Tennessee Eastman (TE) benchmark case studies are provided.     

制造企业基于Internet的设备远程诊断与维护系统研究

介绍了一个用于汽车发动机自动生产线的远程监控与诊断系统的结构与功能,对系统实现的有关关键技术进行了探讨,并给出了运行实例。     

Elevation of Tear MMP-9 Concentration as a Biomarker of Inflammation in Ocular Pathology by Antibody Microarray Immunodetection Assays

Matrix metalloproteinases are a family of enzymes fundamental in inflammatory processes. Between them, MMP-9 is up-regulated during inflammation; thus, its quantification in non-invasive fluids is a promising approach for inflammation identification. To this goal, a biomarker quantification test was developed for ocular inflammation detection using anti-MMP-9 antibody microarrays (AbMAs). After validation with eight healthy control tear samples characterized by ELISA, 20 samples were tested from individuals diagnosed with ocular inflammation due to: cataracts, glaucoma, meibomian gland dysfunction, allergy, or dry eye. Concentration values of tear MMP-9 were obtained for each sample, and 12 patients surpassed the pathological threshold (30 ng/mL). A significant elevation of MMP-9 concentration in the tears of glaucoma patients compared with healthy controls was observed. In order to evaluate the diagnostic ability, an ROC curve analysis was performed using our data, determining the optimal threshold for the test at 33.6 ng/mL of tear MMP-9. In addition, a confusion matrix was applied, estimating sensitivity at 60%, specificity at 88%, and accuracy at 68%. In conclusion, we demonstrated that the AbMAs system allows the quantification of MMP-9 in pathologies that involve inflammation of the ocular surface.