以太网在水质净化厂监控系统中的应用分析

应用TCP／IP协议的Ethernet已成为当前最流行的局域网技术，同时也是最具开放性的网络技术，还具有价格低康的优点。解决了实时性、稳定性、和抗干扰性，Ethernet将会十分迅速地进入工业控制系统的各级网络。以太网和现场总线的混合控制网络结构，为系统的全分散、全开放和不同种类的现场总线系统集成创造了条件。将以太网技术运用到水质净化厂监控系统中，取得了良好的效果。     

基于Ethernet的工业过程控制系统研究

随着现场总线的迅速发展,以太网也将成为网络控制系统的发展方向,以太网也以其数字式、可互操作、开放性的特点受到越来越多关注和重视.本文通过分析解决以太网用于工业控制网络的关键问题,设计并构建了一种基于Ethernet的工业过程控制系统.     

以太网和现场总线的互连

介绍了目前现场总线的发展趋势，并研究了采用隧道技术使现场总线与以太网互联的方法，使以太网和现场总线结合起来组成全分散、全开放的控制网络，能够实现多现场总线的系统集成。     

以太网现场总线EFB控制系统

一、什么是EFB？EFB是EthernetFieldBus以太网现场总线。就是利用当今世界上最流行的开放式局域网Eth－ernet作为连接工业I／O控制模块的通信网络,作为真正开放式的现场总线系统。二、为什么采用Ethernet作为现场总线？1．远程I/O传统方法一般来说,远程I／O系统和主计算机的通信是通过RS－232或RS—422／485,以及CAN,DE－VICENET,LONWORKS,PROFIBUS等现场总线方法。这些现场总线与Ethernet网相比具有以下优缺点：门）RS－232：是最简单最省钱的总线,但缺点是传输距离近,只有SO英尺,通信速率低,点对点形式。…     

现场总线技术的发展与工业以太网综述

本文分析了现场总线技术的现状以及发展方向，并就工业以太网作为今后现场总线技术标准的可行性进行了详细的论述，同时对TCP／IP与以太网相结合的问题进行了阐述，并提出了工业实时Ethernet即Ethernet/IP的概念以及应用前景。     

Profibus-DP在烟叶醇化物流高架库中的应用

当前适用于工业应用的网络主要有DCS局部网络、工业以太网和现场总线网络3种.现场总线发展迅速,网络实现了现场智能仪表和控制室之间的全数字化、双向、多站点通信.随着仓储技术的发展以及自动化技术在仓储中的应用,现场总线技术在物流系统中的应用也越来越广泛.通过在烟叶高架库中的应用,表明了Profibus-DP拥有可靠性高、稳定性强、可扩展以及故障率低等优点,满足了系统的控制要求.     

使工业以太网工作于现场层

工业以太网系统现能为以前运行于现场总线的楼宇自动化提供足够的网络稳定性和实时控制能力。这篇章考察如Ethernet／IP或PROFInet系统移植到现场层运行例如其进入到DeviceNet现场总线后的效应。     

以太网与现场总线的互连方法

研究了现场总线和以太网的互连方法。该方法使现场总线和以太网结合起来,共同组成全分散、全开放的控制网络,并可以实现多种现场总线的系统集成。     

融合了实时以太网技术的新IEC国际标准将带来更清晰的定义--德国国际标准专家Klemm先生欧洲专访

近年来，随着信息技术的迅速发展，以及工业以太网技术的不断完善，使得当前从事自动化技术的专业人员面临着一个问题：是否刚刚进入中国的现场总线技术将会被以太网技术所代替；是否Ethernet技术就是今后的现场总线的未来呢?在2001年刚刚确定的IEC61158的八     

工业监控系统的网络化发展

本文主要在讨论以太网络的基础上,通过和传统的现场总线方式比较,详细分析了以太网在控制领域的多方面应用途径、控制网络系统的设计和构建,以及现场总线结合以太网所采用的主流技术。指出了以太网技术在工业监控系统网络中应用的前景。     

浅谈反映人体测量学来源的人体比例理论

人体测量学并不是现代社会的产物。有着很长发展历史的人体比例理论中就包含了现代人体测量学的基本内容,尽管其还不够系统完整,但至少说明了在艺术创作中诞生的人体比例理论对现代人体测量学的影响。并随着时间的推移而不断的完善发展,为现代人体测量学的系统提出奠定了坚实的基础。     

On the relation of the quality of the system with the configuration of the structure of its control device

By examples of the design in the input-output relations of control devices with various configurations, the dependence on the configuration of the value of the criteria characterizing the system quality is shown. The complexity of solving the problem in the state space is illustrated.     

长江水质预测的建模

分析了在长江水质的评价和预测建模过程中出现的一些问题,利用灰色模型的指数特性,建立预测长江水质的GM（1,1）的改进模型。根据数据的周期波动特性,采用灰色系统理论建立了残差序列周期修正GM（1,1）模型,用复合残差来修正预报数据,提高了数据预报的准确程度和模型的适用性。     

Study of the response of the area of the palm to impact: Relationship between the physical characteristic of the palm impact and the subject perception of the severity of the palm impact

Even though using the hand as a hammer causes injury, the practice continues, and may be increasing, in industry and in jobs that require intensive manual labor. This was an exploratory study aimed at measuring the relationships between the forces of strikes, the relative angles of strikes, and/or the number of strikes (up to 3) with the perception of severity of strikes when using the base of the palm of the hand. Eight subjects struck a metal force plate with the base of the palm of the hand at three levels of force, three levels of angle with respect to the surface of a force plate, and with three different numbers of times in a trial. Subjects were then asked to give a psychophysical rating after each trial. The subjective perception of the severity of each impact and force-time curves were recorded. From each force-time curve, peak force, maximum acceleration of force application, and the area of the force curve from initiation to peak were determined. Sixteen ANOVA models were analyzed.     

JSP实现基于中值排序基数法的BBS树状结构

用JSP实现基于中值排序基数法的BBS树状结构,给出数据结构的设计以及具体的算法实现。     

基于单机的虚拟网络实验平台的实现

为了能够解决学生网络实验的可操作性和实验室安全管理的稳定性之间的矛盾,引入VMware,从而在单机上实现虚拟网络实验平台,提高网络实验教学的课堂效果.     

基于单机的虚拟网络实验平台的实现

为了能够解决学生网络实验的可操作性和实验室安全管理的稳定性之间的矛盾,引入VMware,从而在单机上实现虚拟网络实验平台,提高网络实验教学的课堂效果。     

浅谈紫禁城的屋顶文化

紫禁城是我国古代建筑的精品,显示着古代匠师们在建筑上的卓越成就。其苦心经营的屋顶建构更是彰显了宫殿壮丽的威严和飞动的气势。随着我国城市化建设的加速发展,正确地认识中国传统建筑文化并设计具有中国文化的建筑迫在眉睫。本文将从紫荆城屋顶的造型和色彩两方面探析紫禁城的屋顶文化。     

Reconstruction of the corrective component of the transfer function of the interpolator in the process of calibration of the precision event timer

The peculiarities of the interpolation method based on digital signal processing are considered. It is shown that the transfer function of the interpolator may be represented by the composition of two functional components. A nonstatistical method of reconstruction of the form of the corrective component of the transfer function based on processing of the scatter diagram of the ordered pairs of the experimental and predicted data is investigated. It is shown that such pairs may be obtained in the process of periodic event flow timing with estimations of the time positions of the signal and the predetermined instants of the event occurrence being elements of the ordered pairs. The efficiency of the reconstruction method is illustrated by the experimental results.     

Convergence,the university of the future and the future of the university

 The paper questions the ability of current university systems to respond appropriately to the complex demands of an Information Economy. It argues that new relationships between creative subjects and technology require new thinking about the nature and purpose of universities per se. In particular, attention is drawn to the growing involvement of the private sector in higher education. It is argued that it may not be appropriate to think of the `university of the future' in terms of current public sector and quasi public sector institutions, but rather in terms of an emporium, based on an international trade in educational services, and with the `University' as we now understand it occupying the functions of licensing, quality assurance and cultural custodianship. Accepted: 25 June 2002