FF现场总线的网段负载能力的设计及计算

从生产安全运行的管理要求；电压压降和电流的限制及信号的衰减；网络运行时间的要求；系统设计的影响；备用能力的考虑等各个方面，结合上海赛科聚苯乙烯项目的具体设计，分析隔爆条件下FF现场总线的H1网段负载能力的设计，以供大家探讨。     

基于FF现场总线实现双容液位对象的动态矩阵控制

针对FF现场总线中监控软件实现DMC算法的困难,提出利用Matlab7.0 OPC工具包实现与OPC服务器间通讯并实现DMC控制的方案.仿真结果表明,该方案能在很大程度上缩短监控程序的开发周期,并达到了预期的控制效果.     

FF现场总线控制系统的质量要求及其实现技术

通过对临界实时安全系统质量要求的分析，提出了FF现场总线控制系统的质量要求，并结合FF的特点给出了满足质量要求的实现技术。利用FF的冗余技术实现了FF现场总线控制系统的系统级、回路级和仪表级的容错。利用FF的失效安全机制，使FF在出现不可避免的错误时仍然能够提供最低限度功能，从而实现了更深层次的容错。     

基金会现场总线的拓扑结构及其布线与安装指导

本文总结和阐述了基金会现场总线的网络构成,拓扑结构及其在实际工程应用中安装与布线方面需要的注意事项,并以某半导体工厂中基金会现场总线工程实践为例,为基金会现场总线（Fieldbus Foundation,FF）网络布线和安装提出了一些指导性建议。     

A fuzzy reasoning and fuzzy-analytical hierarchy process based approach to the process of railway risk information: A railway risk management system

Risk management is becoming increasingly important for railway companies in order to safeguard their passengers and employees while improving safety and reducing maintenance costs. However, in many circumstances, the application of probabilistic risk analysis tools may not give satisfactory results because the risk data are incomplete or there is a high level of uncertainty involved in the risk data. This article presents the development of a risk management system for railway risk analysis using fuzzy reasoning approach and fuzzy analytical hierarchy decision making process. In the system, fuzzy reasoning approach (FRA) is employed to estimate the risk level of each hazardous event in terms of failure frequency, consequence severity and consequence probability. This allows imprecision or approximate information in the risk analysis process. Fuzzy analytical hierarchy process (fuzzy-AHP) technique is then incorporated into the risk model to use its advantage in determining the relative importance of the risk contributions so that the risk assessment can be progressed from hazardous event level to hazard group level and finally to railway system level. This risk assessment system can evaluate both qualitative and quantitative risk data and information associated with a railway system effectively and efficiently, which will provide railway risk analysts, managers and engineers with a method and tool to improve their safety management of railway systems and set safety standards. A case study on risk assessment of shunting at Hammersmith depot is used to illustrate the application of the proposed risk assessment system.     

PROFIBUS与基金会现场总线

介绍现在广泛应用的现场总线PROFIBUS和基金会现场总线FoundationFieldbus(简称FF) ,详细说明了PROFIBUS现场总线家族及FF的协议组成、功能和应用特点     

基于FF功能块的过程控制系统优化

本文对FF现场总线标准的功能块及其结构进行了介绍,并从提高控制的分散性和安全性着手,分析了基于功能块的过程控制系统的优化方法.     

基于FF总线848T变送器在反应器温度监控中应用

探讨了基于FF H1总线系统结构的848T温度变送器在反应器温度监控中的应用可行性及其实现方案.     

钴Ⅱ-三乙醇胺-H_2O_2-二甲苯蓝FF体系负催化光度法测定痕量钴

在碱性条件下,痕量钴 与三乙醇胺对H2O2氧化二甲苯蓝FF的反应有较强的负催化作用,钴含量与吸光度的增加值呈线性关系,据此建立了负催化光度法测定痕量钴的新方法。最大吸收波长λmax=638nm,表观摩尔吸光系数为1.2×105,25mL溶液中测定钴的线性范围为0～9μg。用于水样和茶叶中痕量钴的测定,结果满意。     

一种抗干扰能力强的频率通道电路的设计

文中介绍一种抗干扰能力的频率通道电路的设计。该电路突破了传统的斯密特触发器的不足，能根据输入信号幅度自动调节触发电平，工作可靠，通过触发器互锁技术，大大提高了通道抗干扰能力。电路设计简炼，灵敏度高，频率范围宽，具有较高的工程应用价值。