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多目标粒子群算法在梯级水库联合防洪调度中的应用研究
Application of Multi-Objective Particle Swarm Algorithm in Joint Flood Control Operation of Cascade Reservoirs
 [PDF]

李豹, 建中, 欧阳
Journal of Water Resources Research (JWRR) , 2012, DOI: 10.12677/JWRR.2012.13007
Abstract: 针对金沙江下游梯级与三峡梯级联合防洪调度中的多目标优化问题,综合考虑各水库坝身防洪安全及上下游防护区安全等目标,建立了梯级水库联合防洪多目标优化调度模型,提出多目标粒子群算法对模型进行优化求解,构造外部档案集来保存求解过程中的非劣解,并基于个体聚集距离来维持外部档案集的粒子分布性,得到了分布均匀且范围广的非劣调度方案集供决策者评价优选。分别选取1981年和1998年为典型洪水年,对各典型年不同频率下的设计洪水进行了联合防洪优化调度,实例研究结果表明,相比于三峡梯级单独运行,梯级水库联合防洪调度可有效削减三峡梯级的入库洪峰流量,降低三峡坝前最高水位,提高长江中下游的防洪能力。
Focusing on the multi-objective problem of joint flood control operation for the JinshaRiverdownstream cascade reservoirs and the Three Gorges cascade reservoirs, a multi-objective optimization model of the joint flood control operation for Cascade Reservoirs was established, considering the objectives of flood control safety of cascade reservoirs and upstream and downstream protection zones. The model was solved by the proposed multi-objective particle swarm algorithm. Meanwhile, the set of external files to save the non-inferior solutions in the solution process was constructed, based on the clustering distance of the particle which maintains the distribution of the external file set. Finally, the solution distributes of a wide range set of the non-inferior scheduling programs offering to policy makers for evaluation and selection. 1981 and 1998 were selected as the typical years, a joint control optimization scheduling under design flood has been done at different frequencies in the typical flood year. And cases study results has shown that, compared with a separate run in the Three Gorges cascade, the joint flood control of cascade reservoirs can effectively reduce the Three Gorges Cascade storage peak flow and the highest water level of the dam in Three Gorges, meanwhile, enhance the flood control capacity of the middle and lower reaches of the Yangtze River.
洞庭湖流域水资源可持续利用度模糊综合评判
Evaluation of Water Resources Sustainable Utilization Based on Fuzzy Recognition in Dongting Lake Basin
 [PDF]

念清,, 沈新平, 刘晓群
Journal of Water Resources Research (JWRR) , 2013, DOI: 10.12677/JWRR.2013.25041
Abstract: 水资源可持续利用是经济和社会可持续发展的重要条件。本文以洞庭湖流域水资源系统为例,采用模糊识别模型,充分考虑洞庭湖流域水资源分布及其利用特点,选取评价指标并建立模型,得到流域内各水系近几年水资源可持续利用程度评价值。研究表明,洞庭湖流域各水系中沅江水资源的可持续利用程度最高,而洞庭湖区最低。2011年洞庭湖流域的可持续利用程度较往年有所下降,整个洞庭湖流域的水资源可持续利用程度还有较大的上升空间。研究结果对于促进流域水资源安全有效利用,经济、人口与生态环境的协调发展有重要意义。
The sustainable use of water resources is a very important condition of economic and social sustainable development. The fuzzy recognition model is used to assess the water resources sustainable using of Dongting Lake basin in this paper. The utilized characteristics and water resources distribution of Dongting Lake basin are considered plenty. Select evaluation index and model is established, and the evaluation value of the water resources sustainable utilization is get within the river basin in recent years. The research result shows that the degree of water resources sustainable use of Yuanjiang River is the highest, while the lake area is the lowest. At the same time, the degree of sustainable use of Dongting Lake basin has declined in 2011 than in previous years. The sustainable utilization level of water resources has still a large increase space in entire lake basin. The study has significance to promote the safety and effective use of water resources, the coordinated development of economic, demographic and ecological environment.
天然气管网压力能利用技术分析
Analysis on Pressure Energy Utilization Technology of Natural Gas Pipeline Network
 [PDF]

, 孙金栋, 高顺利, 晶晶
Advances in Energy and Power Engineering (AEPE) , 2015, DOI: 10.12677/AEPE.2015.33007
Abstract:
天然气管网蕴含着巨大的压力能资源可供开发利用,利用?分析理论计算了天然气管网可用能量,当管网天然气由压力10 MPa、温度293.15 K,降到压力0.8 MPa、温度210.15 K时,可回收压力能达到356.63 kJ/kg。对于年输气能力1500 × 108 m3的天然气管网,可回收能量相当于120 × 104 kW的电站一年的发电量。介绍了天然气管网压力能利用的各种方式,分析了压力能利用技术存在的问题。
The natural gas pipeline network has great potential pressure energy which has not been devel-oped yet. The energy analysis theory is used to calculate the total amount of available energy of the natural gas pipeline network. When the pressure and the temperature of the pipeline network are reduced from 10 MPa to 0.8 MPa and from 293.15 K to 210.15 K, respectively, the recyclable energy can reach 356.63 kJ/kg. For the natural gas pipeline network having annual gas transmission capacity of 1500 × 108 m3, the recyclable energy is equivalent to the annual power generating ca-pacity of 120 × 104 kW. This paper introduces various ways that the natural gas pipeline network pressure can use, and analyzes the existing problems of pressure energy utilization technology.
VRML与外界数据交互的技术实现
,昕宇
计算机系统应用 , 2000,
Abstract: 本文详细讨论了VRML技术与其他数据访问技术相结合 ,实现对数据库实时交互的技术实现方法 ,并简要阐述了相关技术规范的语法结构和技术要求。所用技术手段安全可靠 ,具有良好的实际应用表现 ,便于系统移植。
VLAN技术在以太网中的实现
,昕宇
计算机系统应用 , 2001,
Abstract: 针对网络技术所支持的拓扑结构和实际联网节点的物理分布与现实工作中的行政划分和业务逻辑分工之间存在的分歧,立足现有公开的网络技术规范,分析了VLAN技术在实际网络环境中的应用条件、实现机制和配置技术。
VRML在结构模型分析及虚拟展示系统中的应用
昕宇,
计算机系统应用 , 2000,
Abstract: 本文详细阐述了VRML技术在结构模型分析与展示中的技术手段,简要介绍了VRML规范的技术要求和使用方法,并针对具体开发中出现的难点提出行之有效的解决方法和在设计中应注意的技术细节,技术方案通用性良好,便于扩展,具有广阔的应用前景.
地震大地测量学五十年——对学科成长的思考
,吴云
大地测量与地球动力学 , 2013,
Abstract: ?基于21世纪地球科学发展战略,从科学方法论和科学文化的视角,反思学科发展中可能存在的几个问题:观测理论与技术的“引擎”作用;观测数据挖掘与理解;多尺度动力系统模拟;推进预测进步;学科框架与科学认知途径等。
Least-Square Solutions to a Class of Inverse Problems forAnti-Centrosymmetric Matrices
一类反中心对称矩阵反问题的最小二乘解

Zhou Shuo,Wu Baisheng,

系统科学与数学 , 2007,
Abstract: Given matrix $X,Y$ and $B$, the anti-centrosymmetric least-square solutions $A$ of inverse problem $YAX=B$ are considered. The necessary and sufficient conditions for the existence of such solutions are given and their general forms are established by using the canonical correction decomposition.
含风电场的发输电系统可靠性评估
,李庚银,
中国电机工程学报 , 2010,
Abstract: 基于序贯蒙特卡罗仿真方法,建立含风电场的发输电系统充裕度评估模型。计及输电线路故障和输电线路有功限制,建立考虑风向、尾流效应以及地形因素影响的风电场内各台机组捕获风速计算模型,并提出了新的关于风电场接入系统的可靠性指标。利用Matlab7编写了相应程序,对引入该模型的IEEE-RTS79系统进行可靠性评估。通过对比不同的接入方案,充分评估大规模风电场对发输电系统可靠性的影响。
考虑输电线路故障的风电场容量可信度计算
,李庚银,
中国电机工程学报 , 2010,
Abstract: 风电场容量可信度的计算是确定风电场替代火电厂后可节约的成本以及确定风电上网电价、进而提高风电场经济价值的重要基础。提出了基于有效载荷能力的风电场容量可信度定义,并提出一种基于非序贯蒙特卡罗仿真、采用弦截法计算风电场的容量可信度的算法。该方法考虑了输电线路故障,采用理想常规发电机组和多状态发电机组来衡量容量可信度。编写了相应程序,计算了IEEE-RBTS系统增加风电场后的风电场容量可信度,并结合IEEE-RTS79系统分析了输电线路故障对风电场容量可信度的影响。
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