渗透蒸发的原理和应用（下）

本文介绍一种新的膜分离技术－渗透蒸发的原理和特点，及操作条件对分离性质的影响，并对其关键构件和设备即渗蒸发膜和渗透池作了专门叙述，结合具体实例从有机溶剂的脱水及水溶液中回收有机溶剂两个方面介绍了该技术在工业上应用的效果。     

三江口水电站1号滑坡体成因机制及稳定性分析

阿墨江三江口水电站坝前右岸发育一规模较大的1号古滑坡体。依据野外勘察、试验成果,从定性与定量两个方面对滑坡体的稳定性进行分析、计算,1号滑坡体在天然状态下处于稳定状态,水库畜水后,在正常蓄水及各种不利工况条件下,滑坡体总体仍基本处于稳定状态。三江口水电站已于2010年7月下闸蓄水,2010年9月3台机组全部投产发电。变形监测结果表明,1号滑坡总体位移量并不大,且主要集中在2010年,2011年以来已趋于稳定,鉴于滑坡体距枢纽区大坝较近,仍应重视监测、预警,加强巡视、观察,消除人为活动对滑坡的不利影响,加强库水位的运行控制,避免水位骤降或暴涨暴落。     

江苏省水利地理信息系统三维展示平台构建与实现

江苏省水利地理信息系统三维展示平台在Skyline技术的基础上,加载了全省DOM数据、DEM数据及重点水利设施、建筑及景观三维模型数据,并集成了基于VR技术的大型水利三维虚拟场景,实现了高效率、高精度、精细化三维地形数据的组织、发布和应用,为三维GIS技术在水利信息化建设中提供了广阔的应用前景。     

基于 PSTA2003状态监测系统的水布垭电厂机组运行状况分析

基于PSTA2003状态监测及趋势分析系统和水布垭电厂机组运行积累的数据,通过对比、平滑拟合和作各种曲线图形等分析方法,分析不同机组在各种条件下运行工况的表现,并重点对不同水头下机组的运行状况进行了分析,有利于指导电厂的机组运行、维护检修和保障机组的安全经济运行。     

牙齿窝洞预备标准化数字教学评估研究

牙齿窝洞预备技术的训练是牙科临床教学中的一个重要环节.本文介绍了牙齿窝洞预备标准化数字教学评估的关键技术.通过对学生预备牙体进行非接触式三维扫描,获取牙体颌面的点云数据,以此实现了基于点云的牙体颌面窝洞形态的重建.通过比较标准形态与测试形态在窝洞轮廓线和窝洞深度上的不同,实现了牙齿窝洞预备结果的数字化评估.在此基础上研发了系统原型,该系统的快速评估过程大幅提高了教师的工作效率,同时提高了学生的口腔实践技能技术.     

An Integrated Groundwater Management Mode Based on Control Indexes of Groundwater Quantity and Level

Groundwater is an important source of freshwater throughout the world. Due to over-exploitation of groundwater over many years, a number of potential adverse hydrogeological problems have raised. To reduce such adverse effects, it is necessary to carry out strict groundwater management in over-exploited areas. In this study, quantity-level binary control management mode has been developed in Tianjin. Initially, the management is the key to determine control levels of groundwater including the blue line levels (proper levels) and red line levels (warning levels), the blue line levels can be determined by the ground settlement recovery scenario, and the red line levels can be determined through planning groundwater exploitation scenarios. By comparing the real-time observed groundwater data with the blue levels and red levels the management grade of groundwater levels which are present, can thus be identified. Secondly, the corresponding management strategies would be determined by the management grade. On this basis reasonable groundwater levels and mining schemes can be made. Finally, the water quota for each sector can be optimized and adjusted in real time according to the binary groundwater management methodology established in this study. Thus, the exploitation of groundwater can be monitored and dynamically managed by the real-time monitoring levels and the sustainable utilization of groundwater resources can be achieved. To achieve all the objectives mentioned above, it is necessary to provide a powerful tool through the utilization of a numerical model for groundwater management. Based on geological and hydrogeological conditions in Tianjin city, a three-dimensional numerical groundwater flow model was established by coupling a one-dimensional soil consolidation model with MODFLOW model. Through calibration and verification, the model showed good simulation accuracy. It proved that the new management mode can provide a scientific basis for groundwater management.     

金华市加强水利工程质量监督的实践与探索

金华市针对当年水利工程建设任务重,基层水利工程质量监督工作存在能力不足等困难,加强水利工程质量监督工作,建立健全质量监督管理体系。通过对基层水利工程质量监督工作中存在薄弱环节的分析,提出加强水利工程质量监督工作的建议。     

陆水水库水环境保护需求分析

为保证陆水水库水源区的水质安全,缓解和控制水环境污染、水质恶化的状况,依据多年水质实测资料,对陆水水库水污染情况进行了分析评价。结果表明,陆水水库水体水质总体良好,达到Ⅲ类标准,但由于库区经济的快速发展,水质存在恶化的趋势,点源、面源污染日趋严重,部分库湾、支流出现富营养化,且存在一些潜在的污染风险源。针对库区存在的水环境问题,提出了开展水质监测体系建设、水污染的“源-输移-汇”控制、微量毒害污染物防治、生态工程修复等关键技术研究的建议,以切实保护陆水水库水环境,为保障水源质量打好基础。〖HJ〗     

Design and analysis of a model predictive controller for active queue management

Model predictive (MP) control as a novel active queue management (AQM) algorithm in dynamic computer networks is proposed. According to the predicted future queue length in the data buffer, early packets at the router are dropped reasonably by the MPAQM controller so that the queue length reaches the desired value with minimal tracking error. The drop probability is obtained by optimizing the network performance. Further, randomized algorithms are applied to analyze the robustness of MPAQM successfully, and also to provide the stability domain of systems with uncertain network parameters. The performances of MPAQM are evaluated through a series of simulations in NS2. The simulation results show that the MPAQM algorithm outperforms RED, PI, and REM algorithms in terms of stability, disturbance rejection, and robustness.