浅谈水厂净水工艺的选择

指出了现行水厂工艺选择所面临的问题,并以佛山某水厂为例,详细叙述了1个规模为60×104m3/d的新建水厂的工艺选择过程.     

南康市二水厂工程设计及若干问题的探讨

介绍南康市二水厂工程的设计实践，讨论了与水厂设计相关的若干问题。     

国内外水厂净水工艺的比较

结合国内外部分给水厂设计实例,对净水工艺进行了总结和探讨,分析了各类水厂的特点和差别。     

PLC变频恒压供水技术在水厂的应用

中小型水厂一般日供水能力在一万吨到十万吨的范围,水泵电机由380V低压供电,单功率在315KW以下的水厂.这种规格的水厂在我国的中小城市、大中型工矿企业及经济发达地区的乡镇中都极为普遍. 这类水厂水泵配置一般有(大、小)两档或(大、中、小)三档功率.水泵的数量和容量由备用要求和供水能力决定,不同档功率的水泵用来调节供水压力.     

井冈山水厂设计体会

阐述水厂设计中对水厂规模、水源地、净水厂位置及净水工艺的确定过程，根据原水的特点，通过分析对无阀滤池进行改良。     

UF系统在农村净水厂中的应用及运行分析

采用内压式UF(超滤)膜组件为核心的UF设备,组建UF系统应用于新建县大塘水厂和铁河水厂,以解决当地农村饮用水水质不达标的问题。结果表明,在水厂UF系统建设完成后,净水效果较好,出水水质较为稳定;出水水质符合国家《生活饮用水卫生标准》(GB 5749-2006)标准,其中出水浊度在0.3 NTU左右,对细菌与病毒的去除率优于常规处理工艺;TMP增量分别为0.098 71 k Pa/d和0.099 17 k Pa/d并与时间呈线性相关,说明膜污染情况较小,在可控范围内;水厂运行费用为0.351元/m3,说明UF系统适用于农村水厂的建设。     

Controlview软件的应用与开发

介绍了美国AB公司的控制软件Controlview在泉州泉南水厂自动控制系统中的应用及其汉化处理程序的开发．利用Controlview软件开发了水厂可编程序制器（PLC）控制系统上位机监控软件．同时为便于现场工作人员操作使用，用C工具对该监控软件进行了汉化处理，实现了水厂的现代化控制与管理．     

首钢水厂铁矿精选机远程集中智能控制实验成功

首钢水厂铁矿精选机远程集中智能控制实验，实现了优化选别效果、降低备件消耗、提高经济效益等预期目标。首钢水厂铁矿坚持走以信息化带动工业化，以工业化促进信息化的新兴工业化路子，为实现选矿生产的全流程自动控制，选定了“精选机远程集中智能控制实验”的课题。水厂铁矿使用的精选机，     

水厂的能耗分析与节能措施

自来水行业是国家民生行业,也是解决居民最基本保障的行业,无论水厂的规模大小、制水工艺如何,均有着诸多的耗能设备。自来水的主要成本控制是人工和能耗,本文通过收集各类规模、不同工艺的水厂的电量能耗数据,分析水厂内各类设备的能耗输出比并探究主要能耗设备的改进节能方案。     

浅谈自动控制技术在我矿自来水厂中的应用

本文阐述了自动控制技术在我矿给排水工程中的应用实践,探讨了自动控制技术在我矿自来水厂应用的意义,水厂自动化仪表的设置,以及水厂工艺过程检测和控制系统的基本原理。     

Energy-Efficient Trajectories of Unmanned Aerial Vehicles Flying through Thermals

This study presents optimal energy-efficient flight trajectories of a generic unmanned aerial vehicle (UAV) flying through a vertical moving thermal cell. A two-dimensional point-mass model of a jet-engined UAV in the vertical plane is used. UAV equations of motion and the thermal wind expression are normalized for numerical efficiency and four fundamental parameters are identified. UAV flights through a thermal cell are formulated as nonlinear optimal control problems that minimize the average thrust per unit time, subject to UAV performance constraints and periodic flight boundary conditions. These problems are converted into parameter optimizations and solved numerically. Fuel efficiencies of these optimal trajectories are compared with those of reference optimal flights in the lack of thermal winds. Both constant thrust and variable thrust solutions are obtained. Two patterns of optimal flights through thermals are identified, and their characteristics are analyzed. Both patterns of optimal flights are also explained from an energy maximization point of view. Effects of the fundamental parameters on optimal UAV flights are examined. Results suggest that significant improvements in UAV fuel consumption are possible by taking advantage of thermal energies.     

Optimum Design of Welded Steel Plate Girder Bridges Using a Genetic Algorithm with Elitism

The genetic algorithm (GA) is a general optimization technique that has some unique features that are especially suitable for structural engineering problems. This work uses a simple GA with elitism to find the optimum design of welded steel plate girder bridges. The objectives are to minimize the weight and the cost of the girders. Two types of plate-girder bridges are studied: a single-span bridge and a two-equal-span continuous bridge. Bridges with various span lengths, in increments of 20?ft, are investigated; results are tabulated, parametric studies are made, and meaningful conclusions are drawn.     

中国锰系铁合金现状与发展

介绍了世界、中国锰系铁合金生产、消费和进出口情况，分析了锰系铁合金的需求发展与变化，预测了2003年中国锰系铁合金消费、出口与生产情况，展望了2005年中国锰系铁合金的消费需求，提出了发展建议。     

经验法查找10kV单相接地线路

提出10kV接地故障的危害,接地方式的种类和选择,介绍人工查找10kv接地故障的管理和技术措施,阐明现场处理经验和注意事项,用流程图总结整个接地查找方法,实际效果显著。     

客运专线用100米钢轨矫直断裂原因分析

 客运专线用100米60kg/m重轨在焊轨厂拼焊后,当四面矫直时发生断裂。采用光学显微镜及扫描电镜（TEM）等方法对钢轨矫直时断裂原因进行了分析和研究。结果表明：钢轨断裂是由于距钢轨端部约100mm轨底边缘处存在凸台缺陷,此凸台在钢轨拼焊后进行除瘤时除瘤刀将其铲平,致使钢轨产生冷裂纹,进而在矫直时断裂。通过控制万能精轧上下辊的辊径差以及调整轧制线高度等方面,使钢轨出轧机时尽量保持平直,避免上翘或扣头,从而消除凸台缺陷的产生。     

气柜密封油的再生利用

介绍了干式气柜密封油的性能要求、分析了焦炉气柜密封油性能降低的原因,提出了改进方案,并获得了良好的效果。     

赣南钨矿山资源状况调查与思考

通过赣南钨矿山资源调查,反映钨矿山资源状况不容乐观。据地质报告中统计,赣南累计探明WO3储量149.98万t,其中上平衡表113.67万t,而保有储量仅有46.7万t;国有钨矿山保有储量26.4万t,可利用的储量10.4万t,可服务年限大都在10a以下。因此,建议尽快对赣南的国有钨矿山开展新一轮的地质找矿,寻找新的接替基地,控制钨矿产量,对尾砂综合回收和利用。     

推钢式加热炉的技术改造及效果

介绍了包钢特钢分公司推钢式加热炉技术改造的情况,对加热炉存在的问题进行了分析,提出了改进措施,经过技术改造提高加热炉的能力,降低了煤气消耗,取得了较好的经济效益。     

矿产资源定价方法的实证研究

文中分析了资源－环境－经济一体化核算的研究现状及存在的问题,界定了矿产资源核算的内涵及其对象,论述了矿产资源定价的理论基础,探讨了矿产资源的各种定价方法及其优缺点,适用范围,建立相应的估价模型,并进行了实证分析,这项研究对我国的资源－－环境－经济一体化核算的理论研究与实践进展具有重要的理论意义和现实意义。     

Stability and Accuracy of Weighted Four-Point Implicit Finite Difference Schemes for Open Channel Flow

The unsteady motion of streams, with a free surface, has been described by a system of equations that were proposed by Saint-Venant in 1871. These are universally known as “Saint-Venant’s equations.” Weighted four-point implicit finite difference schemes are largely used for their numerical solution in the case of one-dimensional flow. For these models, stability, dissipation, and dispersion are first investigated by looking at the truncation error and then by using Fourier’s classic linear analysis. Variations of the space and time weighting coefficients, the Courant number, the Froude number, and the frictional resistance term are examined in this paper. In particular, instabilities are analyzed that are due to the progressive accumulation of dispersion errors, which are the consequence of an increasing frictional resistance term. However, in this case the numerical scheme requires a dissipation mechanism. Computational suggestions are given for this mechanism.