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针对电力系统的信息安全需求,设计和实现了基于公钥技术的电力数字证书服务系统(PCSS),讨论了其技术特点,分析了该系统自身的安全性,并介绍了其在电力业务服务器身份认证中的应用。PCSS是一个安全支撑平台,能为它上面的应用系统提供强身份认证、加解密、签名验签、时间戳等安全服务,有效地解决了电力应用系统网络上用户身份认证和安全传输的问题。PCSS的实施将加速数字电力系统的实现进程。 相似文献
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SDH(同步数字系列)技术在现有的电力系统通信网起着很重要的作用;MSTP(多业务传送平台)是在SDH后发展起来的,能很好地支持TDM业务,同时支持日益增加的数据网业务的一项新技术,有着十分广阔的应用前景。介绍了SDH技术的基本原理以及其在电力系统通信中的应用;阐述了MSTP技术的特点,并结合电力通信的实际情况,分析了其在电力系统通信网中的应用。 相似文献
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随着电力行业的发展,电力企业中不同管理部门中不同结构、相互独立的多个异构信息系统越来越希望整合成一个一体化的信息管理平台,以提供统一的开发、维护和管理,并实现各级系统间有效的数据、资源和功能共享。文中介绍了开发的电力企业信息一体化平台,重点介绍了基于可扩展标记语言(XML)的数据交换平台,基于工作流引擎管理并遵循企业Java组件模型/公共对象请求代理体系结构(EJB/CORBA)结构的电力业务集成和基于虚拟数据仓库的智能决策系统的设计和实现方案。实际应用表明,该方案实现了电力企业中各级业务系统间数据的互操作性、应用间的协调性,为企业的一体化经营和管理提供了科学的决策依据。 相似文献
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水利信息化是实现水利现代化的基础和重要标志。以水管理对象为基础,利用现代信息技术构造数字流域,集中管理流域内的水事问题,是实现流域现代化管理的有效途径。从数字流域体系架构、水管理对象构造及全息化描述、基础平台构建、业务系统的构件化开发、数字功能流域等方面详细介绍了基于水管理对象的数字流域构造技术方法。 相似文献
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卢强 《水电自动化与大坝监测》2000,24(9)
提出了数字电力系统(DPS)的概念,并对其主要功能、所需进行的基础研究工作以及如何实现等问题进行了阐述。数字电力系统有助于实现电力系统的科学化管理和决策以及系统状态实时评估,改善系统的安全稳定性,制定和实施经济运行策略,对电力系统实施紧急控制和反事故控制等。最后还专门论述了建立数字电力系统所需的硬件支持问题。 相似文献
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针对水利行业传统信息化系统难以满足整合联动、一线使用的问题,研究并实现了一种基于无线的移动办公整合应用平台。系统通过移动互联网及云计算技术,融合并云化水利业务应用资源,使行业用户能够通过智能手机终端随时随地获取工作所需要的数据,实现移动办公、远程应急指挥的目的。在广东省全省"智慧水利"项目中的应用结果表明:该平台取得了良好的效果,为防洪抗旱调度决策、指挥抢险救灾、水资源管理甚至水利工程安全提供了快速判断、直观验证的高效率监管、防范手段。 相似文献
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首先指出电力系统中宽带数据通信网络技术的发展为在系统内构建移动工作流平台提供了必要的网络基础,对电力系统内部移动工作流的应用及前景进行了分析,根据电力系统数据传输网络的状况和应用业务的特点,对移动工作流平台解决方案中存在的难点及关键技术进行了详细阐述,设计了移动工作流引擎方案并对基于此的整体架构、功能模块及系统安全措施进行了论述。 相似文献
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根据冗各电站地下厂房开挖支护的施工顺序,以隐式杆单元模拟锚杆,以壳单元模拟混凝土喷层,采用三维非线性有限元技术,对洞室群的开挖支护动态过程进行了模拟计算。通过三维非线性有限元计算分析得到:洞室群动态开挖过程中围岩应力变形的分布规律,围岩塑性区的发展规律,锚杆受力变化情况。计算结果表明:整个开挖过程中,洞周围岩位移变化规律正常,量值较小,塑性区主要分布在洞室周边,围岩稳定性较好;但在洞室交叉口处围岩的变形较大,出现较大范围的塑性区,在此基础上提出了支护措施优化方案,并对优化方案的效果进行了评价。 相似文献
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The relocation of unionacean mussels is commonly used as a conservation and management tool in large rivers and streams. Relocation has been used to recolonize areas where mussel populations have been eliminated by prior pollution events, to remove mussels from construction zones and to re-establish populations of endangered species. More recently, relocation has been used to protect native freshwater mussels from colonization by the exotic zebra mussel Dreissena polymorpha. We conducted a literature review of mussel relocations and evaluated their relative success as a conservation and management strategy. We found that 43% of all relocations were conducted because of construction projects that were forced to comply with the Endangered Species Act 1973 and that only 16% were monitored for five or more consecutive years. Most (43%) relocation projects were conducted from July to September, presumably a period when reproductive stress is relatively low for most species and the metabolic rate is sufficient for reburrowing in the substrate. The mortality of relocated mussels was unreported in 27% of projects; reported mortality varied widely among projects and species and was difficult to assess. The mean mortality of relocated mussels was 49% based on an average recovery rate of 43%. There is little guidance on the methods for relocation or for monitoring the subsequent long-term status of relocated mussels. Based on this evaluation, research is needed to develop criteria for selecting a suitable relocation site and to establish appropriate methods and guidelines for conducting relocation projects. 相似文献
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In the lower River Murray, Australia, populations of gastropods have declined markedly over the past 40 years. Of the native fauna of about 18 species, only the ancylid Ferrissia petterdi remains common (but in patches), and another five species feature in sporadic local resurgences. Until recently the viviparid Notopala was thought to be extinct. The introduced physid Physa acuta is widespread, but in low numbers. The decline probably is associated with flow regulation, high turbidity and the introduction of common carp. Snail populations have persisted, however, in irrigation pipelines fed from the river, where they periodically cause blockages. This paper reports the discovery of the only known populaion of Notopala hanleyi in a pipeline where the inner wall accumulates microbial and other organic matter, providing high quality food for snails. In the Murray before regulation most of the periphytic biomass was probably microbial, as fluctuating water levels would have maintained littoral communities in a highly productive, early state of succession his postulated that, by stabilizing seasonal water levels, regulation has promoted the production of filamentous green algae, an inferior food source, and so displaced snail populations from the open aquatic environment. 相似文献
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V. K. Konovalov O. V. Yashkin V. V. Ermakov 《Power Technology and Engineering (formerly Hydrotechnical Construction)》2008,42(2):105-109
A system for removal and pneumatic transport of fly ash is examined, in which air pulses act on batches (pistons) of ash formed
in a duct. Studies are made of the effect of several physical parameters on the force required to displace a piston of ash
and these serve as a basis for choosing a system for removal and pneumatic transport of ash simultaneously from several hoppers
of an electric precipitator. This makes it possible to separate the ash particles according to size without introducing additional
components. Formulas are given for calculating the structural and dynamic parameters of this system and measurements of indirect
dynamic parameters are used to calculate the input-output characteristics of the system. In order to optimize the system,
configurations for summing several ducts into a single transport duct for pneumatic ash transport are proposed. Some variants
of dry ash utilization and the advantages of producing of size-separated particles are considered.
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Translated from élektricheskie Stantsii, No. 2, pp. 26–30 (2008). 相似文献
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Peter B. Bayley 《河流研究与利用》1991,6(2):75-86
The ‘flood pulse advantage’ is the amount by which fish yield per unit mean water area is increased by a natural, predictable flood pulse. Evidence for this increase is presented from tropical and temperate fisheries. It is argued that increasing multispecies fish yield by restoring the natural hydrological regime is consistent with increasing production of other trophic levels and with restoration from ecological and aesthetic viewpoints. When applied to a river-floodplain system, this restoration would provide a large, self-sustaining potential for recreation, commercial exploitation, and flood control. An interim ‘natural flood pulse’ restoration approach is proposed for systems modified for navigation. This approach approximates the natural hydrological regime in a river reach and is intended as a first step in the long process of restoring the watershed. 相似文献
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简述天湖水电站投运以来各种故障的表现形式,分析其原因,提出了相应的处理方法及措施,并对合理利用国内外设备提出建议。 相似文献