火力发电厂厚壁管超声波检测方案

目前火力发电厂机组容量大,管道多采用厚壁管,对厚壁管的对接焊缝进行超声波检测时,为了提高侧壁未熔合缺陷的检测率,提出采用适当的超声波探头,特别是正确的探头角度,制订出超声波的检测方案。     

基于实时在线仿真方法的球磨机多变量控制系统

提出一种基于MATLAB的实时在线仿真系统并详细论述其实现方法。阐述该系统磨煤机模糊控制系统设计中的应用情况。根据该系统设计的控制器在河南开封火电厂3号机组的运行表明，此控制方法能提高磨煤机的可靠性和经济性。     

基于GM模型进行舰船纵摇参数预测

航母6个自由度运动严重干扰舰载机安全起降,目前还没有一种有效的办法去解决舰船的纵摇。因此,进行舰船姿态特别是纵摇参数的分析和预报,对于舰船姿态参数补偿控制系统及起降自动控制系统设计非常重要。利用灰色动态GM模型对舰船运动参数进行预测试验研究。试验结果表明,由于只需要对未来极短时间内纵摇参数进行预测,GM(1,2)模型考虑单个因变量影响,基本可以预测纵摇参数发展走势,并且运算简单,具有实践参考意义。     

GM,Duke to explore fuel cell policy issues

Duke University in Durham, North Carolina and General Motors have reached an agreement on a multi-year, interdisciplinary teaching and research project aimed at furthering worldwide efforts to develop hydrogen fuel cell vehicles by 2010. GM has given Duke an initial donation of about $500 000 for the project.     

钢管和铝包钢管OPGW的分析比较

目前,国内生产的OPGW主要为不锈钢管结构,但如果要求OPGW的截面积或缆直径较小而短路电流较大,其选型比较困难。文章详细分析了钢管和铝包钢管OPGW的结构特点和相关参数,通过比较认为:铝包钢管OPGW可补充钢管OPGW结构系列中的不连续区段,但当OPGW的外径、截面积足够大且外层股线直径也足够大的情况下,铝包钢管结构并不具优势。     

基于多项式拟合和GM(1，1)模型在煤矿伤亡事故中的数据预测模型

通过建立多项式拟合模型找出影响预测结果的异常数据,剔除后建立GM(1,1)模型。对某集团1991年-2003年的伤亡事故统计数据,运用MATLAB工具箱,由图形观测和相对误差分析,提高了模型预测的准确性和适应性,其预测精度大幅提高,预测期望值高于单一的多项式拟合和灰色预测模型。     

Dow switches on first GM fuel cell at Texas plant

The US energy secretary Spencer Abraham pulled a lever in Freeport, Texas and began the Phase 1 installation operations of the first fuel cell unit in the world's largest commercial fuel cell transaction. The deal between Dow Chemical and General Motors, unveiled last summer [FCB, July 2003], aims to prove the viability of hydrogen fuel cells for a large industrial power system.     

Greenlight test stations for GM,Hydrogenics electrolyzer for NRC

BC-based Greenlight Power Technologies, the fuel cell test equipment subsidiary of Hydrogenics Corporation in Toronto, has fulfilled an order from General Motors for six PEM fuel cell test stations. The 12 kW H-series FCATS? fuel cell automated test stations were delivered to GM's Fuel Cell R&D facility in Honeoye Falls, New York.     

凝汽器不锈钢管改造技术分析

汽轮机组运行凝汽器铜管泄漏是长期困扰铜陵发电厂的主要问题,对机组运行安全形成严重威胁.将凝汽器铜管更换为不锈钢管,更换后达到了预期效果.     

An integrated tube cleaning system

A modern and efficient method for removing deposits from the inner surfaces of tubes used in heat-transfer equipment operating at thermal and nuclear power stations is considered. This method is intended primarily for cleaning steam-turbine condensers, delivery-water heaters, and gas- and oil coolers with thin-walled tubes made of nickel-copper alloys or brass 19–28 mm in diameter, with a 1-mm thick wall, and 5–11 m long.