改进遗传算法在污水处理工艺优选决策指标权值确定中的应用

构建了基于模糊聚类的改进遗传算法（简称FMGA）,用于污水处理工艺优选决策指标权值的确定。FMGA的数值仿真结果表明,该算法能有效避免早熟收敛,能在较短时间内获取指标权值并且运算过程稳定。最后,将FMGA用于确定三峡库区城镇污水处理工艺优选决策指标的权值。结果表明,经济（0．2602）〉技术（0．2094）〉能耗（0．...     

Drain of the Yellow River at Shandong Section: Causes and Countermeasures

1Harmful impacts of the drain of the Yellow RiverAccording to existing hydrographic records,the drain of the Yellow River (hereinafter referred toas the Drain) has the following three features.(1 ) The annual starting date of the Drain has beenadvancing.(2 ) The drain season has been prolonging.(3) The drain section has been extendingtoward the upper reaches of the Yellow River.In 1 997,the Yellow River suffered a drain of 2 2 6days atthe locality of L ijin County,Shandong Province and o…     

大型气候实验室高低温模拟系统关键技术研究

目的突破关键技术,获得适用于大型气候实验室的高低温环境模拟系统方案。方法通过分析大型气候实验室载冷/载热系统和空气处理系统的工作原理和工作模式,指出高低温环境模拟系统在可能遇到的极端温度下存在的安全风险,从低温试验工况推断出换热器结霜的必然性。根据载冷剂物性设计规避系统安全风险和融霜的技术方案。结果在AS-6系统和CH2CL2系统的二次循环中设计了充注/排空功能,规避了载冷/载热系统的安全风险。设计了内外融霜结合的融霜方案,进行换热器融霜。结论试验和工程应用证明,通过增加载冷剂充注/排空方案和换热器融霜方案完善的大型气候实验室的高低温环境模拟系统方案合理可行,采用的关键技术可以指导类似系统设计。     

石横一期烟囱冲洗水及排液系统改造

介绍了石横电厂一期烟气脱硫技改项目中烟囱及入口烟道排液系统改造情况,论述了烟囱及烟道排液系统改造要点、运行方式,提出了烟囱排液系统的改造方案。     

非对称HALO掺杂栅交叠轻掺杂漏围栅MOSFET的解析模型

为抑制短沟道效应和热载流子效应,提出了一种非对称HALO掺杂栅交叠轻掺杂漏围栅MOSFET新结构.通过在圆柱坐标系中精确求解三段连续的泊松方程,推导出新结构的沟道静电势、阈值电压以及亚阈值电流的解析模型.结果表明,新结构可有效抑制短沟道效应和热载流子效应,并具有较小的关态电流.此外,分析还表明栅交叠区的掺杂浓度对器件的亚阈值电流几乎没有影响,而栅电极功函数对亚阈值电流的影响较大.解析模型结果和三维数值仿真工具ISE所得结果高度符合.     

Combined reticular blind drainage and vertical hierarchical drainage system for landfills located in areas with high rainfall and high groundwater level

A novel water control technology that combines the features of a reticular blind drainage system and a vertical hierarchical drainage system is developed and applied in the Yanziyan Sanitary Landfill, which is located at an area (Loudi City, Hunan Province, China) with high rainfall and high groundwater level. The reticular blind drain system, which was installed on the bottom and side walls of the landfill site, can conveniently guide the flow of groundwater out of the site while preventing a disorganized flow of groundwater. The vertical hierarchical drainage system was installed to separate rainfall water and leachate in the landfill site, thus efficiently reducing the pressure of leachate treatment. The whole drainage system plays a key role in foundation stabilization by seepage control and separation and in the instant drainage of rainfall water. The leachate reduction efficiency of the drainage technology was calculated in terms of leachate production before (336519 m³) and after (29664 m³) technology application. Over 90% of leachate derived from rainfall water and groundwater inflow was avoided upon installation of the vertical hierarchical drainage and reticular blind drainage systems. The technology can thus be popularized and applied for water control in landfills located in areas with high rainfall and high groundwater level. The proposed technology can be used to alleviate the pressure of leachate treatment and to reduce the risk of instability.     

试论城镇排水环境问题的改善

我国是属于水资源短缺的国家之一,在水资源开发利用方面和综合整治水资源的现状都将面临很多的问题。本文重点从两种发展趋势出发,将原有的雨污合流排水方式根据水环境的情况逐渐的使用雨污分流排水方式来逐渐替代,同时要通过对雨水处理厂的建设,从而完成排水后续方面的工作问题,形成一个符合目前水环境的整体排水体系,实现真正的雨污分流,达到改善排水环境的目的。     

火电厂离子交换树脂再生废水处理及减排

针对火电厂离子交换树脂再生废水中和处理过程中遇到的问题,探讨影响中和处理的因素,并提出减少火电厂离子交换树脂再生废水排放的措施.     

Modeling the Effects of Tile Drain Placement on the Hydrologic Function of Farmed Prairie Wetlands

The early 2000s saw large increases in agricultural tile drainage in the eastern Dakotas of North America. Agricultural practices that drain wetlands directly are sometimes limited by wetland protection programs. Little is known about the impacts of tile drainage beyond the delineated boundaries of wetlands in upland catchments that may be in agricultural production. A series of experiments were conducted using the well‐published model WETLANDSCAPE that revealed the potential for wetlands to have significantly shortened surface water inundation periods and lower mean depths when tile is placed in certain locations beyond the wetland boundary. Under the soil conditions found in agricultural areas of South Dakota in North America, wetland hydroperiod was found to be more sensitive to the depth that drain tile is installed relative to the bottom of the wetland basin than to distance‐based setbacks. Because tile drainage can change the hydrologic conditions of wetlands, even when deployed in upland catchments, tile drainage plans should be evaluated more closely for the potential impacts they might have on the ecological services that these wetlands currently provide. Future research should investigate further how drainage impacts are affected by climate variability and change.