闸门自动启闭控制系统在冯家山水库的建设与运用

经过两年多的努力,冯家山水库闸门自动启闭控制系统于2006年3月建成.初步投入运用后,该系统在精确度、安全性、可靠性等方面均取得了较好的效果,值得类似水库自动化建设时参考.     

收购兼并在上市公司发展战略中的地位和实施策略

本文主要阐述了以下三个方面的问题：（1）公司为何及时从事购并交易；（2）如何使购并活动获得成功；（3）制定中国进行购并行动的战略。     

水轮机调速器现代调节技术及选型

对目前比较先进的微机调速器的两种系统结构进行了分析，并对微机调节的控制策略和调节参数的设置及系统配置等作了介绍，并提出了对凋速器技术性能的评价标准和调速器选型时的突出问题，可为实际应用提供参考。     

基于延迟自相关特性的码速率测量技术

通信信号的识别与解调是通信侦察的重要研究内容，在通常情况下，通信信号的很多参数并不知道。本文介绍了一种基于通信信号码延迟自相关特性的码速率测量技术，并给出了码速率测量理论分析及基于硬件的实现技术，仿真和实验结果表明本方案具有较高的测量性能。     

对可行性研究报告及经济评价的几点认识

指出在建设项目前期工作中存在的问题，建设项目前期工作滞后，前期方案深度不够，需对可行性研究报告及项目经济评价的方法与参数进一步完善，重视风险问题及清偿能力分析，提高技术经济人员的综合分析能力，实现投资决策科学化，提高经济效益。     

洪水预报调度决策系统在抗击台风中的作用

洪水预报调度决策系统近年来在全国各地得到广泛的应用。简单介绍了洪水预报系统的系统组成及功能,分析了系统在抗击台风过程中的作用与效益,总结了系统多年的运行和维护经验。根据多年的运行经验,系统能及时提供雨、水情数据和高效的调度会商决策,提高防御台风、突发性暴雨等自然灾害的能力。     

Impact of dams on point bar habitat: a case for the extirpation of the Sacramento Valley Tiger Beetle,C. hirticollis abrupta

Quantitative analyses of flow and stage data, remote sensing and geographic information systems analysis, and field studies were used to assess the impact of dams and diversions on the point bar habitat of the Sacramento Valley Tiger Beetle (Cicindela hirticollis abrupta). The reaches of interest include sites of known historic populations of C. h. abrupta along the Sacramento River from approximately 8 km north of Colusa southward to the confluence with the Feather River and along the Feather River between Yuba City and its confluence with the Sacramento River. The results from this study show that construction of two major dams has altered flows such that prolonged and increased flows during summer, fall, and early winter have most likely disrupted life cycles, flooded larvae, drowned overwintering adults and led to high mortality. Additionally, habitat availability has decreased over time because point bars have decreased in number and area causing increased distances between populations and isolation of populations. Moreover, point bar armouring, channel scouring, altered flows, redirected flows through weirs, and lithologic controls have produced a bimodal distribution of mean grain sizes in the Sacramento River in which the more northern bars contain gravel deposits and more southern bars possess fine sands. These conditions negatively alter moisture retention and sediment compaction and, consequently, burrowing conditions needed by this tiger beetle. Additionally, more stabilized flows (reduced variability) and increased fine‐grained deposition have enabled development and encroachment of vegetation onto the sand bars. Finally, human stresses, such as foot traffic and vehicular traffic may have interfered with burrowing, ovipositing, and foraging. The combination of these stress factors has most likely led to a reduction in source populations and, ultimately, the apparent extirpation of the entire metapopulation. Copyright © 2006 John Wiley & Sons, Ltd.     

Effect of reliability of grounding of the shaft of a turboset on the operation of devices for control and protection of exciting circuits

Disturbance of the grounding of the shaft of a turboset or its absence for technical reasons can result in failure, misoperation, limitation of the operating zone, errors or limitation of the sensitivity of devices for control and protection of exciting circuits from single-point leakage, and electroerosion of elements of the turboset structure. Measures for increasing the reliability of the grounding of the shaft are discussed. __________ Translated from élektricheskie Stantsii, No. 3, March 2006, pp. 61–66.     

关于健全独立董事制度的若干思考

入世给我国中小企业的发展带来了机遇与挑战。培育核心竞争力是其抓住机遇 ,应对挑战 ,走向成功的关键所在。文章在分析了我国中小企业面临困境的基础上 ,提出了培育我国中小企业核心竞争力 ,促进我国中小企业发展的方法和措施。     

战后日本经济发展中积极财政政策的研究

战后，在实现经济恢复和高速发展过程中，日本政府高度重视财政政策的宏观调控作用，在运用财政政策调节经济方面开辟了一条符合本国国情、突出本国特点的路子．对日本战后积极财政政策进行分析和评价，对我国经济发展具有重要的参考借鉴意义。