Development of a false alarm free, Advanced Loose Parts Monitoring System (ALPS)

An Advanced Loose Parts Monitoring System (its acronym is ALPS) has been developed and installed on each unit of the Paks Nuclear Power Plant, Hungary. ALPS uses sophisticated methods to identify the events hidden in the quite extensive background noise of nuclear power plants. A classification algorithm based on an expert system, which is trained during the start-up period of each fuel cycle, helps to improve the false alarm rate. Thus the false alarm rate was reduced to a minimum, statistically below 1%. In practice, even the remaining “false alarms” were identified to be originating from other noise sources using ALPS. The main principles of ALPS are presented. It is demonstrated, that even weak signals, comparable with the resolution of the analog-digital board, i.e. comparable with detection noises, can be identified at high certainty. Other events like vibration of the shaft of motor operated isolating valves have been identified by ALPS. Furthermore, experiences gained during the installation period are also discussed.     

多级染料激光放大器中激光增益与放大自发辐射强度的理论研究

利用激光增益和放大自发辐射 (ASE)理论 ,对不同条件下的染料激光放大器的激光增益和ASE强度进行了数值计算。分析了当入射光强远小于和大于有效饱和光强时 ,激光增益和ASE强度与入射光相对强度的关系 ,讨论了在两种条件下ASE系数以及染料池端面反射系数对激光增益和ASE成分的影响。最后利用这些结果 ,对连续激光的多级染料放大系统的优化设计进行了讨论。     

一种新型数据仓库体系的实现

针对当前流行数据仓库体系DB-DW存在的不足，引入ODS，构建起DB-ODS-DW数据仓库三层体系结构；并在分析当前通用数据仓库逻辑建模方法不足的基础上，提出将第三范式(Third Normal Form，3NF)和星型模式(Star-Schema)两种建模方法相结合来设计和实现DB-ODS-DW体系。     

飞来峡水电站发电机的运行故障分析

本文针对飞来峡水电站灯泡式水轮发电机的实际运行故障进行系统的分析，给出灯泡式水轮发电机的设计和运行规律及注意事项。     

正压型防爆装置工作原理及实例分析

在遵循GB3836国家标准的基础上，通过对正压型防爆配电柜的实物分析，详细介绍了正压型防爆装置的防爆原理、电气控制原理、产品结构及组成部分。     

A knowledge-based approach to safety evaluation for plant start-up

To improve the safety of plant start-up operation, a safety evaluation system has been developed. As a key component in an operational design support system, the evaluation system examines any potential hazards during start-up operation simulation. The evaluation system is integrated into an operational design methodology which designs operable processes by proposing alternatives, examining process safety and operability, and modifying operating procedures or plant structures. Issues for both methodology and implementation of a G2-based expert system are discussed. Finally, the system is applied to an industrial hydrodesulphurization process.     

开关式高频功率放大器的稳态分析

本文对CUk电路用于高频功率放大作了较详细的稳态分析，深入探讨了这种放大器工作在诸振状态和失谐状态下电路的工作原理，着重说明了开关器件所承受的电压和电流。     

470 t/h大型循环流化床锅炉甩负荷试验研究

包头第一热电厂扩建工程470t/h循环流化床锅炉配125 MW双抽式汽轮发电机进行甩负荷试验研究,结合循环流化床锅炉的自身特点及没有高低旁路的情况下进行甩负荷,探讨如何控制汽温汽压等参数；根据循环流化床锅炉的特点,切断燃料后锅炉仍能维持一定时间的正常燃烧,并保持一定时间内电负荷和床温稳定,待床温及电负荷有下降趋势时,将电负荷甩至零,不致造成甩负荷后锅炉超温超压,即安全门未动作,管壁温度不超限,使锅炉在甩负荷后可迅速接带负荷；通过对甩负荷过程中锅炉燃料系统、烟风系统、汽水系统等参数的理论分析及实际甩负荷试验过程观察,证明循环流化床锅炉具有快速变负荷的特性。     

一种全差分的高速CMOS运算跨导放大器(OTA)的优化设计

全差分高速CMOS运算跨导放大器由一个折叠-级联输入级和一个共源输出增益级构成，并采用Cascode补偿技术．在对运算跨导放大器的性能做了详细的分析后，设计出一个采用单纯形优化算法的优化程序，它能够快速地设计出满足指标的运算跨导放大器．最后给出了一个设计实例．     

基于LM324的直流电动机调速器设计

介绍了一种基于LM324集成四运放的直流电动机调速器的设计方法，给出了详细的电路原理图及说明。所设计的调速器中设置了软起动、电压负反馈、电流正反馈、过电流截止保护、微分校正电路等环节，并采用了简单而有效的脉冲封锁和失磁保护技术。