局域网故障诊断与排除

该文涉及的网络是指局域网,包括局域网内的所有服务器、PC、网络设备和与之相连接的网络线路。针对相关的故障类型,初步做出判断,并进行故障排查,定位故障点,排除故障。     

基于IEEE1451.2标准的IP传感器

简要回顾了传感器的发展历程，提出了IP传感器的概念，介绍了IEEE1451.2标准的制订及其主要技术特征，讨论了新型的工业自动化结构，展望了在这种结构下IP传感器的应用前景。     

The role of response repetition in task switching.

When switching between tasks, participants are sometimes required to use different response sets for each task. Thus, task switch and response set switch are confounded. In 5 experiments, the authors examined transitions of response within a linear 4-finger arrangement. A random baseline condition was compared with the cuing of specific response subsets grouped by hand or by finger equivalence, and these subsets were examined in both single task and task-switching designs. Results showed that part of the task switch cost is associated with switching between response sets. Furthermore, the analysis revealed a novel effect: When task switching and repetition trials are mixed, a bias towards switching the response and/or hand is found in task repetition trials. Response repetition is hindered when a task switch is expected, even for those trials when a switch of task does not occur. The results demonstrate executive processes involved in task set configuration closely depend on the motoric processing of the response set. The results are also important for current theories of task set control. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

飞机加油模拟系统设计及试验

以飞机加油系统要求的加油压力指标为输入,设计并研制了一套地面加油模拟系统及其控制系统,进行了试验台综合试验。采用旁路分流和串联节流的方式,基于电液伺服调节方法实现加油压力和流量闭环控制。上位机采用LabVIEW软件及信号调理系统完成数据的采集、处理和输出,利用PID控制算法实现过程控制。基于负载模拟和两路压力闭环控制通道切换的方法,使加油压力在地面得以稳压,在加油接头处具备良好的精度和稳定性。给出了几组阶跃响应和冲击响应试验曲线,结果表明:该加油模拟系统能够提供飞机要求的加油压力,其控制精度满足设计指标要求。     

外加电流阴极保护高频开关恒电位仪的研制

介绍了一种新型阴极保护电源——高频开关式恒电位仪的主要特点和原理，指出了高频开关式恒电位仪融合了先进的数控技术、高频开关技术和现代通讯技术，管理维护方便，综合性能突出，是外加电流阴极保护电源的发展方向。     

粮库用30点温度巡测仪的研制

介绍一种体积小，成本低，操作简便，经济实用的粮库用30点温度巡测仪，并详细地阐述了该仪器的工作原理及制作，校正等操作性较强的经验和方法。     

Fast switch fault diagnosis for PWM DC–DC low power converters

In this paper, a fast switching fault diagnostic scheme is proposed for low‐power pulse width modulation (PWM) DC–DC converters operating in different conduction modes. The outstanding feature of the proposed scheme is that no additional sensing circuits are needed. This is achieved by using the differential of output ripple voltage and the switch gate driver signal for diagnosis. Since the output voltage has to be normally measured for control purposes and the PWM signals are known to the controller, no additional sensors are needed in the proposed scheme. Moreover, based on the real‐time output voltage measurement and switch gate driver signal, the characteristics of switch open‐ and short‐circuit faults can be rapidly extracted, specifically, in less than one switching cycle. Besides, the fault detection scheme can be implemented by a low‐cost logical hardware circuit, which can be integrated into the control unit. The fault diagnosis principle, design considerations, and implementation of the detection scheme are discussed in this paper. Experimental results show that the fault detection system can detect the switching fault in four‐tenths of the switching period. Besides, the proposed method can be used in the applications where the output voltage ripple rate is more than 4%, which covers most situations. © 2017 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.     

加强科研管理人才队伍建设的思考

知识密集的科研单位，在需要大量各类专业技术人才的同时，还需要一批优秀的科研管理人才；要把科研单位本身打造成为“百年老店”，科研管理人才队伍的建设更为重要。正确认识科研管理工作在提升科研水平中的作用；采取科学有效的方法，激发科研管理人才的工作热情；加强培训，提升科研管理人才的能力和水平，为科研单位的可持续发展提供各类人才保证。     

宝泉抽水蓄能电站的特殊设备和特殊保护

宝泉抽水蓄能电站为适应机组在发电和抽水工况的不同磁场旋转方向,设置了换相闸刀、被拖动闸刀、拖动闸刀、起动母线及特殊设备,并针对各种特殊工况下的非常运行方式,设置了电压相序监视保护、低频保护、低功率保护、逆功率保护、低频过流保护及定子保护。从而实现其调峰填谷、调节电压频率及事故备用等功能。     

神经网络专家系统在矿业中的应用

主要介绍了杂合智能技术在矿业中的应用，如ANN与ES、GA与ANN、GA与ES等。当务之急是建立矿山系统的广义杂合智能模型，在此基础上，开发出一系列矿业智能开发工具及平台。