智能水电厂现地自动化系统技术分析

介绍了智能水电厂自动化系统总体架构以及智能水电厂现地自动化系统应具备的特征,分析了水电厂现地自动化系统的现状,并在对智能变电站进行研究的基础上,分别从构建现地系统高速数据总线的IEC 61850标准、现地系统的体系结构、现地系统的智能化等几个方面探讨了智能水电厂现地自动化系统技术,阐述了智能水电厂现地自动化系统的技术发展趋势。     

Perfect match model‐based link assignment to design topology for satellite constellation system

In satellite constellation network, the satellites visible from one satellite are more than communication terminals (CTs) equipped. Each inter‐satellite link (ISL) would occupy one CT on each of two satellites connected by this ISL. Therefore, a fundamental problem considering link assignment is how to assign limited CTs for each satellite to establish ISLs with its visible satellites. Link assignment scheme based on perfect match model (LAS‐PMM) is proposed to make full use of huge bandwidth provided by CT. In LAS‐PMM, the problem of assigning all the CTs of each satellite to establish ISLs is modeled as a perfect matching problem, where a perfect matching is searched over a mixed complete bipartite graph. Simulation results show that LAS‐PMM is better than the regular and greedy LASs, in terms of CT utilization and average node‐to‐node distance. Copyright © 2015 John Wiley & Sons, Ltd.     

机载激光扫描（LIDAR）标准数据格式(LAS)的分析与数据提取

机载LIDAR技术作为一种高精度的三维地物探测手段,其相应的数据格式也在不断发展。美国摄影测量与遥感（ASPRS）协会下的LIDAR委员会于2003年发布了标准LIDAR数据格式LAS,经过改进,目前已有4种版本,分别是LAS 1.0、1.1、1.2与2.0（拟定版）。本文在解析4种版本的基础上,探讨了LAS标准格式的发展趋势,并采用IDL 6.2语言对该格式的LIDAR数据进行读取和转换试验,检验了LAS格式的效率,并为以后的LAS格式数据处理提供参考。     

凹凸棒石处理阴离子表面活性剂废水

目的研究凹凸棒石吸附废水中阴离子表面活性剂LAS的可行性及处理效果,考察其吸附LAS的一般规律．方法以自配LAS水样为处理对象,比较凹凸棒石原土和不同改性方法改性的凹凸棒石对LAS的吸附效果,选择吸附剂;分析反应时间、温度和pH对经盐酸改性后的凹凸棒石吸附LAS的影响．结果用2mol·L^-1的盐酸改性的凹凸棒石吸附LAS符合Freundlich吸附等温式,其LAS去除率可达70．69％;反应时间越长,LAS的去除率越高,30min时可达到较高的去除率;改性凹凸棒石在酸性和中性条件下对LAS的吸附作用明显优于碱性条件．结论改性凹凸棒石适合做含阴离子表面活性剂废水处理的吸附剂,经盐酸改性的凹凸棒石吸附效果最好．     

烷基苯磺酸钠（LAS）在环境水体中的自然降解

环境水体中LAS的自然降解是影响其在环境归趋过程的一个重要机制,一直是环境界研究的重点。为此,简述了LAS的特性,讨论了LAS在环境水体中的自然降解,阐述了LAS的降解机理,并分析了LAS分子结构、初始浓度及水体中微生物数量、种类、温度、供养量及pH值等主要因素对LAS降解效率的影响,为以后LAS的扩大应用及其污染治理提供了充分的参考和依据。     

阻尼分布式泡沫分离塔处理合成洗涤剂生产废水的研究与应用

研究了气液返混对泡沫分离的影响并采用阻尼分布构件改善了气液两相流动状态,提高了分离效率。在合成洗涤剂厂生产废水脱除LAS的分离中在一定的间径比、开孔率、气液比、孔径的条件下,阻尼分布式泡沫分离塔比空塔分离效率提高了近一倍,取得了很好的效果。     

The influence of sodium tripolyphosphate and zeolites on detergency of linear alkylbenzene sulfonate in the presence of Mg++

The influence of sodium tripolyphosphate (STPP) and zeolites on the detergency performance of linear alkylbenzene sulfonate (LAS) has been evaluated at different water magnesium ion levels. This study demonstrates that LAS/STPP gives better results in the presence of calcium than in the presence of magnesium, whereas the LAS/zeolite mixture gives better results in the presence of magnesium than in the presence of calcium.     

C/C复合材料与LAS陶瓷连接的显微结构与性能

采用Y2O3-Al2O3-SiO2-TiO2(YAST)玻璃作为中间层,对SiC-MoSi2表面改性的C/C复合材料与Li2CO3-Al2O3-SiO2(LAS)陶瓷进行热压连接,所施压力为20MPa,保温时间为30min,连接温度分别为1150℃,1200℃,1250℃,1300℃。利用SEM,EDS和BEI(背散射电子像)对SiC-MoSi2涂层,连接界面的形貌和断口进行了分析,研究结果表明,SiC-MoSi2涂层与基体结合紧密,Si、C元素在界面处呈梯度状分布,形成厚度约为15μm的过渡层。YAST玻璃与基体润湿良好,接头的剪切强度可达26.21MPa。     

Environmentally-assisted cracking behaviour in the transition region of an Alloy182/SA 508 Cl.2 dissimilar metal weld joint in simulated boiling water reactor normal water chemistry environment

The stress corrosion cracking (SCC) and corrosion fatigue behaviour perpendicular and parallel to the fusion line in the transition region between the Alloy 182 Nickel-base weld metal and the adjacent SA 508 Cl.2 low-alloy reactor pressure vessel (RPV) steel of a simulated dissimilar metal weld joint was investigated under boiling water reactor normal water chemistry conditions. A special emphasis was placed to the question whether a fast growing interdendritic SCC crack in the highly susceptible Alloy 182 weld metal can easily cross the fusion line and significantly propagate into the adjacent low-alloy RPV steel. Cessation of interdendritic SCC crack growth was observed in high-purity or sulphate-containing oxygenated water under constant or periodical partial unloading conditions for those parts of the crack front, which reached the fusion line. In chloride containing water, on the other hand, the interdendritic SCC crack in the Alloy 182 weld metal very easily crossed the fusion line and further propagated with a very high rate as a transgranular crack into the heat-affected zone and base metal of the adjacent low-alloy steel. The observed SCC cracking behaviour at the interface correlates excellently with the field experience of such dissimilar metal weld joints, where SCC cracking was usually confined to the Alloy 182 weld metal.     

TiB2掺杂对碳纤维增强锂铝硅复合材料抗氧化性的影响

目的 研究含有不同质量分数的TiB2的Cf/LAS复合材料的抗弯强度变化规律。方法 以碳纤维、TiB2、硝酸锂、硝酸铝、硅溶胶和氨水为主要原料,采用溶胶凝胶法结合浆料浸渍-热压烧结工艺,制备了加入TiB2的碳纤维增强锂铝硅微晶玻璃（LAS）复合材料Cf/LAS(TiB2),利用XRD、FTIR、万能材料试验机、SEM等对Cf/LAS(TiB2)复合材料的性能和微观结构进行研究。结果 TiB2的质量分数为1%, 3%, 5%, 9%的Cf/LAS(TiB2)复合材料,在1000 ℃热处理30 min后的强度保留率分别为2.9%, 29.1%, 44.0%, 50.0%。结论 材料的强度保留率随TiB2含量的增多而上升,因此Cf/LAS(TiB2)复合材料的抗氧化性随着TiB2含量的增加而增强。