模糊综合评价法在长江下游贵池河段水质评价中的应用

对水质评价存在诸多方法,而模糊综合评价法具有评价结果合理、更接近客观实际等优点,因而得到越来越广泛的应用。通过模糊评价方法对长江下游贵池河段2005～2009年间水环境综合评价,并采用加权平均原则求取隶属等级,取得较好的效果。     

基于“卓越计划”的运输管理学教学改革研究

运输管理学是物流工程专业核心课程之一。今依据对物流企业的调研结果,从课程定位、教材选择、课堂内容及课堂教学方法等方面进行课程教学改革研究,提出教学内容的模块化、工作项目化及驱动任务设计等环节,构建多种手段并用的课程教学体系。结果表明,教学改革充分发挥了学生的积极性和创造力,为培养出高质量的物流工程技术人才打下了基础。     

乡村居民疫水接触时空规律研究

基于农村居民疫水接触的空间行为及作息时间的地理调查,了解乡村居民的血吸虫病疫水接触时空规律,对43个行政村的疫水接触人数、方式、天数、接触季节和时间段进行调查。农村居民疫水接触方式有种田、捕鱼、游泳、抗洪、挖沙、打藜蒿、放牛、养鸭和洗衣服洗菜一共9种方式,接触方式多、时间长,感染血吸虫病危险性较大。     

Effect of polycarboxylate-type superplasticizer on the paste fluidity based on the water film thickness of flocs

The excess water film theory and the properties of flocs are integrated to examine the effect of the polycarboxylate-type superplasticizer on the paste fluidity.The theory states that excess water can surround the flocs rather than the particles and that the cell consists of a floc and a superficial water film.Experiments on limestone powder pastes were conducted to verify the theory.The superplasticizer dosage(sp%)and the water–powder ratio by volume(Vw/Vp)were systematically varied.A sedimentation balance method was used to measure the size distribution of the flocs in the limestone powder pastes.The water film thickness(WFT)of flocs was then calculated and shown to determine the paste fluidity.Based on this WFT of flocs,the effect of the sp on the paste fluidity was determined and then compared with the effect of water.     

滦河流域水资源可持续利用对策分析

随着人口增长和经济社会的快速发展,对资源需求量急剧增加,水资源短缺已成为严重制约滦河流域经济发展的重要因素。文中简要分析了滦河水资源开发利用中存在的问题,并从提高水的利用效率、调整产业结构、加强水利工程建设、完善水资源管理体系等方面提出了实现水资源可持续利用的对策。     

活性炭对原水中有机污染物去除效果的研究

文中针对原水水质特点,利用常规+活性炭吸附工艺对原水进行处理,着重分析了活性炭对有机物的去除效果。     

以太网供电技术及受电端电路设计

为解决具有以太网接口的小型功率设备供电不便的问题,在分别分析IEEE 802.3af标准中的以太网供电系统构成、以太网供电传输方式、以太网供电过程及其他电气特性的基础上,提出了一种通过以太网获取电源的解决方案,并给出了详细的电路设计原理图。该方案可同时支持以太网供电输入和其他辅助电源输入,并可以同时输出3.3 V和5 V这2种电压供系统使用。测试结果表明,该设计方案具有较低的成本和较高的效率,能够很好地解决小型功率设备供电不便的问题。     

An MIP model to optimize a Colombian cash supply chain

Financial institutions operate a supply chain where only one product is moved across the network. Although the cash is kept in several nodes to service the demand of final customers, availability causes opportunity cost related with its investment options. When planning the inventory of cash that should be maintained across the network, transportation decisions are also expected to be made. Cash transportation has a high cost, associated with the high risk of theft. Increasing the inventory can reduce the need for transportation, but the opportunity cost can be very high. Moreover, the inventory is also related with the service level perceived for final customers; therefore because of low inventory some people are not able to make some transactions. The aim of this work is to find optimal decisions related with cash inventory and transportation across the network, trying to balance the cost of the service and the quality perceived for final users.     

基于PLC和GPRS的供水管网监测系统

针对具体工程实例,分析了在供水管网监测系统中采用传统的无线电台等传输方式存在的缺点以及GPRS技术的优点,选用GPRS DTU作为无线监测设备,通过与单片机系统比较,选用西门子PLC S7-200作为现场数据采集设备。介绍了该系统的结构,硬件的选择,通信的实现,以及主要的监控功能,并说明实际运行三年来所显明的优越性。     

石墨化炉的供电特点及发展趋势

通过对石墨化炉的特点及其供电方面的有关问题的分析，论述了石墨化炉供电的特点及其发展的趋势，并对石墨化炉在交、直流电源供电方面提出了看法，以不断提高石墨化炉供电的设计水平．