论周馥在两江总督任期的经济改革举措

两江总督的辖区是清代全国的财赋重心,社会经济出现了各种新气象,但到晚清时期也暴露出许多问题,如外国资本主义的经济侵略日甚一日、两淮盐政废驰、金融市场混乱、矿业弊病丛生等等。周馥于1904年11月至1906年9月担任两江总督。在近2年的任期内,周馥整饬盐政;勘查三江矿藏,发展民族矿业;整顿海关,发展对外贸易;学习西方,发展新式渔业;竭力稳定金融市场秩序等,这些措施取得了一些成效,对江苏、安徽、江西3省社会经济的发展起了一定的推动作用。     

改善机车柴油机调速系统瞬时调速率的试验研究

介绍改进的调速器结构原理和配机性能试验情况,改进的调速器大大地降低了柴油机的瞬时调速率,对于大功率柴油机调控系统的改进很有价值。     

一种新型限速器

本文所述的是一种新途径，其中，传感器，电子部件以及与安全性能相关的软件取代了传统的机械式限速器。特别要关注的是与安全性能相关的软件的开发过程，还有此类电子系统的硬件结构，不仅要考虑安全问题．还要考虑其可靠性。     

New Territories: Deconstructing and Constructing Countryside – The Great Divide of Rural and Urban In Hong Kong

When mass immigration led to a sixfold population increase in the first two postwar decades, the Hong Kong government's response was to build nine new towns, designate 40 per cent of the land as country parks for urban dwellers' benefit, and allocate buildable plots as compensation to displaced villagers. Guest-Editor Christiane Lange examines how these well meaning efforts broke the cultural and social ties between people and the land that are essential to sustaining a productive rural landscape: a cautionary tale for designers and planners involved in developing the countryside.     

三选二冗余测量技术在水电机组调速系统中的应用研究

针对大型水电机组调速器导叶反馈故障导致的事故,本文分析了目前采用的双冗余导叶反馈测量方式存在的某些不足,提出了导叶反馈信号三选二的冗余测量方法,并从硬件设计上给出了具体方案,同．时也从软件设计上进行了详细分析并提出了相关应用策略。作者认为采用该模式能进一步提高系统的安全性及可靠性。     

An Investigation on Pruned NNARX Identification Model of Hydropower Plant

The aim of this paper is to determine an accurate nonlinear system model for identification of dynamics. A small hydropower plant connected as single machine infinite bus (SMIB) system is considered in the study. It is modeled by a neural network configured as a feedforward multilayer perceptron neural network (MLPNN). An investigation is conducted on various NN structures to determine the optimally pruned neural network nonlinear autoregressive with exogenous signal (NNARX) identification model. The structure selection is based on validation tests performed on these network models. The proposed structure identifies the model characteristics, which represent the dynamics of a power plant accurately. The results show an improved performance in identification of power plant dynamics by optimal brain surgeon (OBS) pruned network as compared to un-pruned (i.e., fully connected) network.     

新型液压控制系统在多喷嘴冲击式水轮机调速器上的应用

介绍了一种用于冲击式水轮机调速器的新型液压控制系统,它采用多套独立的液压系统分别控制喷针和折向器,两者通过电气协联.结构上采用标准化液压元件高度集成,整机无明管和杆件,较常规产品外形小巧,布置灵活、性能和可靠性更高.     

A novel hybrid gravitational search and pattern search algorithm for load frequency control of nonlinear power system

In this paper, a hybrid gravitational search algorithm (GSA) and pattern search (PS) technique is proposed for load frequency control (LFC) of multi-area power system. Initially, various conventional error criterions are considered, the PI controller parameters for a two-area power system are optimized employing GSA and the effect of objective function on system performance is analyzed. Then GSA control parameters are tuned by carrying out multiple runs of algorithm for each control parameter variation. After that PS is employed to fine tune the best solution provided by GSA. Further, modifications in the objective function and controller structure are introduced and the controller parameters are optimized employing the proposed hybrid GSA and PS (hGSA-PS) approach. The superiority of the proposed approach is demonstrated by comparing the results with some recently published modern heuristic optimization techniques such as firefly algorithm (FA), differential evolution (DE), bacteria foraging optimization algorithm (BFOA), particle swarm optimization (PSO), hybrid BFOA-PSO, NSGA-II and genetic algorithm (GA) for the same interconnected power system. Additionally, sensitivity analysis is performed by varying the system parameters and operating load conditions from their nominal values. Also, the proposed approach is extended to two-area reheat thermal power system by considering the physical constraints such as reheat turbine, generation rate constraint (GRC) and governor dead band (GDB) nonlinearity. Finally, to demonstrate the ability of the proposed algorithm to cope with nonlinear and unequal interconnected areas with different controller coefficients, the study is extended to a nonlinear three unequal area power system and the controller parameters of each area are optimized using proposed hGSA-PS technique.     

电力系统稳定器实现于调速系统之研究 第二部分：多机系统中特性分析

本文利用MIMO频域理论,通过引入附加阻尼比矩阵,论证了调速侧电力系统稳定器GPSS具有多机解耦特性,给出了多机电力系统中GPSS的设计方法和一个三机系统设计示例。理论分析和仿真结果均表明,基于相位补偿原理的单机系统GPSS设计方法可以推广于多机系统,从而,避免了多机PSS参数协调的难题,有效地抑制了系统中的增幅低频振荡和弱阻尼振荡。     

水轮机调速器电液随动系统的研究

介绍了一种适合于水轮机调速器中使用的主配压阀-旋转配压阀,建立了旋转配压阀-接力器动力系统的非线性数学模型。并设计了一个传统的PID控制器,对调速器电液随动系统在三种负载条件下的阶跃响应进行了仿真研究。