Comparison of the nutrient removal efficiency of onsite wastewater treatments systems: applications of conventional sand filters and sequencing batch reactors (SBR).

When domestic wastewater was treated with different onsite applications of buried sand filters and sequencing batch reactors, good organic matter removal was common and effluent BOD7 concentrations from 5 to 20 mg/l were easily achievable. For total nitrogen, effluent concentrations were usually between 20 and 80 mg/l. Good phosphorus removal, even using special adsorption or precipitation materials, was difficult to achieve and large variations occurred. The median effluent concentration of total phosphorus in the most successful sand filter application was less than 0.1 mg/l and other sand filters and SBRs had the median concentrations varying from 1.7 to 6.7 mg/l. These results are based on one year in situ monitoring of 2 conventional buried sand filters, 6 sand filter applications with special phosphorus adsorbing media within the filter bed, 5 sand filters with separate tertiary phosphorus filtration and 11 small SBRs of three different types. The study was carried out in southern Finland during 2003-05. The whole project included monitoring of more than 60 plants of 20 different treatment types or methods, used in normal conditions to treat domestic wastewater. Evaluation of the different systems was made by comparing the measured effluent concentrations. In addition the effluent concentrations were compared to the discharge limits calculated according to the new Finnish regulation.     

Brain mapping in animals and humans

The discovery of the Mothers against dpp (Mad) gene in Drosophila has opened a window on an entirely unique signalling pathway that functions to mediate responses to the tumour growth factor beta (TGF beta) superfamily. This pathway, which is comprised of a family of proteins related to Mad, acts to convey signals directly from TGF beta receptors to the nucleus and is implicated in the pathogenesis of human diseases.     

钛合金叶片隔热烘漆的研制

以双酚A型环氧树脂为主要成膜物质,以氮化硼为功能填料,以丁醇醚化脲醛树脂为固化剂,并添加己二酸聚酯弹性体树脂改善其柔韧性、提高涂膜的机械性能,最终得到附着力强、耐热性好、隔热作用明显的飞机发动机叶片用防护涂料.     

Progress and recent trend in MILD combustion

Moderate or intense low oxygen dilution(MILD)combustion plays a significant role in the mitigation of combustion-generated pollutants and greenhouse gases whilst meeting thermal efficiency needs.However,due to the lack of the fundamental knowledge on this combustion,there is a misconception that MILD combustion should be established by high preheating of the air,which has limited its application.Our research and development on this combustion has been performed for several years. We have found that the requ...     

窄带滤光片光学极值法直接监控的光学设计

窄带滤光片是应用于光谱学、激光、天文物理学、通信等各个领域的光学组件,精确控制每一层膜厚是制备滤光片的困难所在.采用光学极值法直接监控工件,可以同时制备多件滤光片.设计了监控光路和信号获得电路,通过探测到的测试信号,监控薄膜膜厚,实现了直接监控.     

一种基于多代理的演化多目标优化算法

为解决多目标优化中求帕列托最优解集的问题,引入多代理演化的思想.在演化的机制上,每个目标赋予单个代理人,这些代理人拥有各自的演化群体.以各自的单个目标作为演化过程中的评价函数,并且以它们各自选择出的优良解群体的分布作为概率分布,通过代理人的通信将这些概率分布合成,作为产生出下一代解的依据.在一些测试问题上,很少的演化代数内,将解群体收敛到帕列托最优解集.该方法在求解多目标优化问题帕列托最优解集上具有较高的效率.     

基于Schema的Web框架设计

现有Web框架没有充分考虑面向pojo对象的编程和XML到关系数据库的映射,导致系统中pojo对象与数据库关系表和其他对象之间的紧耦合。针对该问题提出一种基于Schema的开发框架,该框架考虑数据库关系表与DTD的依赖,集中且合理地布置系统中的pojo代码,方便service对象调用DAO对象,是一种易于扩展和维护的Web框架。     

叶面积指数遥感反演算法研究

叶面积指数是确定陆表生态系统物质和能量交换大小的重要结构参数之一。本文基于NDVI、RVI的反演模型,结合GDAL影像库和C++语言设计实现相关算法,形成从影像数据到叶面积指数图的处理流程,提高了影像的利用率。经预处理的Hyperion数据测试,算法运行稳定且计算结果精确,为植物长势监测、粮食产量预测提供可靠数据源。     

镀层在冲击条件下的失效分析

采用自行研制的冲击试验机对镀层在冲击载荷作用下的失效进行了研究。结果表明 ,由于镀层本身韧性和膜基结合强度的差别 ,镀层的失效表现为两种不同的剥落形式。韧性较低而结合强度较高时为内聚力型剥落 ,膜基结合强度较低而韧性较高时为结合力型剥落