淡水湖泊最小生态需水量简易求解方法及应用

湖泊最小生态需水量是维持湖泊合理水位及水体自净能力的基础,并已成为淡水资源科学配置和持续利用的基本保证。从湖泊形态和典型水生生物的角度出发,探索了湖泊最小生态需水的简易求解方法,为防止湖泊生态系统进一步退化,在确定湖泊最低生态水位时,将水文统计资料中的多年平均年最低水位作为参考值,综合考虑湖泊的死水位、上层典型鱼类生存水位、野生鱼类生存和繁殖所需的最低水位,选取水位的最大值作为最小生态水位,并以江苏省的9个典型淡水湖泊为例,分析了湖泊主要特征参数、湖泊水位特征值及湖泊的主要植被和鱼类状况,获得各湖泊的最小生态需水量。     

基于生态调度的滦河流域多目标优化配置

针对滦河流域的水资源配置问题,建立了滦河流域多目标优化配置模型,运用粒子群算法求解该优化模型中非劣解集,并用支持向量机对非劣解进行评价。计算结果表明,随着水平年的增长,流域内各分区供水量增加,缺水量基本不变,缺水比例减小;95%频率下缺水量的增加较75%频率下要快。     

石灰石一石膏湿法脱硫系统石膏旋流器分级效率的研究

针对提高脱硫效率和石灰石利用率、提高产品品质和降低厂用电率等问题,从优化分级效率的角度探索提高石膏旋流器性能的方法．采用试验的方法,寻找石膏旋流器结构和工作参数对分级效率的影响规律．结果表明：较高的入口压力、适中的溢流管壁厚和内径、较大的溢流管插入深度以及选用渐缩式阿基米德螺旋线入口结构等因素对石膏旋流器的分级效率有积极效果．     

Applying RBF network to predict location in mobile network

In mobile network, quality of service （Qos） is difficultly guaranteed for the particularity of mobile network. If the system knows, prior to the mobile subscriber movement, the exact trajectory it will follow, the Qos can be guaranteed. Thus, location prediction is the key issue to provide quality of service to mobile subscriber. In the present paper, RBF Network of Neural Network techniques were used to predict the mobile user＇s next location based on his current location as well as time. The software Matlab 6.5 was used to confirm the parameters of RBF network, and to same training data, makes the detailed contrast with resilient propagation BP and BP in learning time and steps of learning. Experiment results show that predicted locations with RBF are more effective and accurate than resilient BP.     

Object oriented modelling and simulation of hydropower plants with run-of-river scheme: A new simulation tool

This paper presents the design of a component library for modelling hydropower plants, and describes the development of a new simulation tool for small hydropower plants with a run-of-river scheme. After reviewing the desirable features of simulation, an approach based on an object oriented modelling language, like EcosimPro, is presented. A general model of hydropower plant with run-of-river scheme is created with this component library. It provides the possibility of choosing a specific number of turbines and spillway gates. In this way, several hydropower stations of similar operating characteristics can be simulated using this same general model. It is expected to obtain interesting information in simulation like the reservoir level, water flows, turbine efficiencies, and so on. In addition, a graphical user interface has been designed in order to operate this general model more easily, to configure plant parameters and to simulate the plant behaviour under different conditions. Three real stations have been used as real examples for validating the model and testing the simulator: hydropower stations of Villafranca and El Carpio (Córdoba, Spain) and Marmolejo (Jaén, Spain).     

投影寻踪模型在农田水位优选中的应用

在综合考虑资源、环境和效益相统一的基础上,利用基于加速遗传算法的投影寻踪技术提出了稻田控制排水的评价指标体系,构建了多目标优化的水稻田间控制排水评价模型,通过对测坑控制排水方案中稻田排水产生的污染负荷、籽粒产量和作物耗水量3个因素的评价和优选,确定了水稻田间全生育期最优控制排水方式,为指导水稻田间灌排实践提供依据。     

天津市雨洪水资源化利用探讨

天津市属重度水资源性缺水地区,如何利用好雨水资源,缓解防洪、水资源短缺及水环境恶化的问题成为重要课题。从天津市雨水资源化利用现状入手,分析存在的问题,并对雨水利用潜力进行综合分析,针对天津市的特殊地理位置和水利工程现状,提出相应的雨水资源化利用的对策和措施。     

网络伪装不良信息检测方法的研究与仿真

研究网络中不良文字信息检测问题,提高检测的准确率。针对传统的不良信息检测方法都是针对具体的非法汉字进行对比检测的,没有考虑到汉字中的语义特征,当不良信息由合法汉字组成的时候,基于特征的检测方法由于没有考虑语义的因素,过于依赖不良汉字库,造成不良信息漏检率很高的问题。为解决上述问题,提出一种根据语义关联决策的信息过滤技术,通过计算信息语义与不良信息语义的关联程度,运用语义因素判定非法信息,有效克服传统方法的弊端。实验证明,方法能快速、完整地将高度伪装的不良信息检测出来,保证了信息的安全,取得了不错的效果。     

南水北调中线天津干线渠首电站水力设计

主要介绍了天津干线渠首电站工程的水力设计过程,采用＂陡坡＋消力池＂的结构型式与下游衔接,从而提高陡坡输水安全性,使总体布置更加合理。     

天津滨海休闲旅游区水源优化配置方案分析

天津滨海新区已被列入国家重点经济开发试验区,随着滨海新区的开发、开放,势必对水资源提出了更高要求。根据滨海休闲旅游区规划,对水资源状况进行了分析与研究。该区周边可利用的水资源在天津地区而言相对比较充沛,但因处于粗放管理的状态,需要把多种水源有机整合和合理配置,实现分质供水,优水优用,实现区域水环境治理、供水配水的统筹规划和统一调度、科学配置,实现水资源的高效利用。