An emission time series generator for pollutant release modelling in urban areas

Dynamic priority pollutant (PP) fate models are being developed to assess appropriate strategies for limiting the release of PPs from urban sources and for treating PPs on a variety of spatial scales. Different possible sources of PP releases were mapped and both their release pattern and release factors were quantified as detailed as possible.This paper focuses on the link between the gathered PP sources data and the dynamic models of the urban environment. This link consists of (1) a method for the quantitative and structured storage of temporal emission pattern information, (2) the retrieval of spatial emission source data from a GIS covering the studied urban area, (3) the coupling of the (GIS-based) spatial emission source data with temporal emission pattern information and (4) the generation of PP release time series to feed the dynamic sewer catchment model.Steps 3 and 4 were included as the main features of a dedicated software tool. Finally, this paper also illustrates the method's applicability to generate model input time series for generic pollutants (N, P and COD/BOD) in addition to priority pollutants.     

水平巷道火灾中烟流逆流层长度的实验研究

为考察水平巷道火灾中烟流逆流层长度随巷道风速及火源放热速率的变化规律,在一条长9m,横断面30cm×30cm的模拟巷道中进行了燃烧模拟实验.实验采用一直径为10cm,以煤油为燃料且燃烧强度可调的油盘为火源,测量了巷道走向垂直中心面上的二维温度分布、风流及烟流速压、烟流组分以及其逆流长度等参数,并根据测量结果推算出了巷道风速及火源放热速率.实验数据的拟合结果表明,无量纲逆流长度L*随火源放热率Q与巷道风速u的比值增大近似按指数规律增大,即L*=0.0404exp(0.0414Q/u).     

连云港市东方医院门急诊楼人工挖孔灌注桩的施工

通过工程实例,阐述了人工挖孔灌注桩施工的整个过程、出现的问题、相应的预防措施、处理办法及质量控制检查,对喷浆搅拌井圈护壁的施工工艺作了特别分析。     

小电流接地系统单相接地电容电流补偿与选线双功能装置的研究

在理论分析的基础上,阐述了中性点经消弧线圈接地电网的单相接地电网的单相接地电容电流检测和补偿的原理解决子补偿与选线之间的矛盾,并研制出补偿与选线双功能动态模型装置,试验结果与理论分析相符合。     

H_2O_2-N_2OH-Sn(Ⅱ)/Sn( Ⅳ)体系电化学振荡行为

选择Ｈ２Ｏ２浓度为０．３８～１． １８ ｍｏｌ／Ｌ,考察各种因素对Ｐｔ电极上Ｈ２Ｏ２。在控电流条件下电势振荡行为的影响,在此基础上,构造了一个新的电化学振荡器即 Ｈ２Ｏ２－ ＮａＯＨ－ Ｓｎ（Ⅱ）／Ｓｎ（Ⅳ）电化学振荡体系,进一步得到该电化学振荡体系的一些规律。     

汽轮发电机组DCS系统在线性能计算程序的剖析及改进

对国内某发电厂３００ＭＷ汽轮发电机组引进ＤＣＳ系统中的在线性计算程序进行剖析和改进,着重分析了程序中的几处典型错误,产生错误原因和修改程序的方法,并对程序改进前后的计算结果进行了比较。     

单纱的计算机模拟

提出了用带有圆弧边的倾斜的矩形色块作为基本单元,并用其上随机产生的抛物线样条曲线作为毛羽的单纱的计算机模拟方法。用VC^ 实现过程中使用的主要成员函数。并给出实现纱线旋转功能的算法,这样就使得模拟出的单纱图像有更加逼真的效果。     

从学习动机的视角出发改革大学英语的教学内容

随着教学研究与实践的深入，人们对影响学习者学习效果的因素有了越来越理性的认识，研究重点也有了转移，从影响学习者的学习效果的外部因素转移到了影响学习者学习效果的内部因素。学习动机与学习效果之间的关系以及学习动机与教学内容之间的关系已成为当前教育界研究的重要课题之一。介绍了相关的学习动机理论，列举了大学生学习外语的主要动机，并据此提出了外语教材应包括的主要内容以及选择教材和教学过程中应注意的问题。     

Assessment of photo-activated adhesive workholding (PAW) technology for holding “hard-to-hold” workpieces for machining

Manufacturers often have to machine “hard-to-hold” metallic workpieces using conventional fixturing. In these special cases, machined feature quality typically suffers from set-up related errors, or set-up lead time suffers from the extra time necessary to check and correct for them. A technology that may alleviate both problems is photo-activated workholding (PAW) technology. This paper describes an investigation in which a photo-activated workholding (PAW) technology solution was created to hold a “hard-to-hold” bracket casting for low volume machining at a contract manufacturer. A comparison to the existing conventional solution revealed that the PAW technology yielded substantially better machined feature quality, machining lead time, and machining cost.