金属材料内部缺陷精确工业CT测量方法

利用图像点扩散函数(PSF)近似计算法建立线阵探测器工业CT金属材料X射线衰减测量模型,并利用该测量模型对垂直于X射线平面边界灰度幅值进行数值计算,获得当前PSF曲线。在此基础上,建立基于近似PSF曲线的缺陷检测理论模型,并对缺陷进行定量检测分析。采用高能6 MeV工业CT线阵探测器系统,对含有人工缺陷的不锈钢试块进行缺陷检测试验。结果表明：相比于传统半高宽缺陷测量方法,本实验方法在缺陷定量检测精度上有较大提高,从而为提升金属材料内部缺陷的定量检测水平提供新的方法和技术途径。     

中国脉冲功率科技进展简述

从脉冲功率科学技术的基本内涵出发,回顾我国脉冲功率发展历史,按照高功率脉冲加速器建设历程,我国脉冲功率技术发展史可大致分成三个阶段：自主创业、加速成长到创新超越;尝试以国际视野介绍我国在闪光照相、Z箍缩、高功率微波、电磁发射和工业应用等方面的发展成就;简要阐述脉冲功率技术未来发展趋势,建议大力发展先进辐射源技术,关注爆磁压缩技术,加强HPM、抗核加固和电磁发射等各类负载技术攻关,加大协同创新和应用推广。     

基于因子与聚类分析的中国建筑业产业竞争力研究

建筑业作为我国国民经济的支柱产业对推动经济的发展起着巨大的作用.本文基于《中国统计年鉴》(2006)和《中国建筑业统计年鉴》(2006)的数据,采用因子与聚类分析相结合的集成方法对中国31个省市的建筑业产业竞争力进行了排序和聚类.分析结果显示,中国建筑业产业竞争力的地区差异明显,对其解释了原因.其结论对推动中国建筑业的发展具有重要的借鉴意义.     

面向逆向工程的工业CT图像预处理系统开发

为了将工业CT技术应用于逆向工程中,开发了一个面向逆向工程的工业CT图像预处理系统。该系统主要通过图像处理、轮廓拟合和数据格式转换三个步骤对工业CT切片图像进行处理,输出的IGES格式数据能直接输入到专业化的逆向工程软件中进行３维CAD模型重构,减少了重构３维模型的工作量;输出的２维DXF格式数据能直接输入到AutoCAD软件中进行处理,提高了系统的灵活性。同时,提出了用加权方法计算拟合圆弧的圆心和半径,有效提高了曲线的拟合精度。并通过实例验证了该系统的正确性。     

Bridging the Gap between Industrial and Well‐Defined Supported Catalysts

Many industrial catalysts contain isolated metal sites on the surface of oxide supports. Although such catalysts have been used in a broad range of processes for more than 40 years, there is often a very limited understanding about the structure of the catalytically active sites. This Review discusses how surface organometallic chemistry (SOMC) engineers surface sites with well‐defined structures and provides insight into the nature of the active sites of industrial catalysts; the Review focuses in particular on olefin production and conversion processes.     

开的产业生态系统最优产业单链的搜寻

应用优化理论对开的产业生态系统进行了研究,以净产出为目标函数建立了开的产业生态系统产业单链的优化模型,并对最优产业单链的搜寻进行了讨论;应用本文的方法对当前我国农业面临的秸秆问题进行了讨论.     

重庆劣势产业选择研究

运用数据包络分析模型,初筛出重庆劣势产业的候选产业,再按照相应的综合基准系数,通过层次分析,选出重庆的劣势产业,最后,在充分考虑可持续发展的基础上,确定重庆应当退出的劣势产业.论文研究思路及其方法对我国老工业基地的产业结构调整具有重要的参考借鉴意义.     

Remotion of organic compounds of actual industrial effluents by electron beam irradiation

Organic compounds has been a great problem of environmental pollution, the traditional methods are not effecient on removing these compounds and most of them are deposited to ambient and stay there for long time causing problems to the environment. Ionizing radiation has been used with success to destroy organic molecules. Actual industrial effluents were irradiated using IPEN's electron beam wastewater pilot plant to study organic compounds degradation. The samples were irradiated with and without air mixture by different doses. Irradiation treatment efficiency was evaluated by the Cromatography Gas Analyses of the samples before and after irradiation. The studied organic compounds were: phenol, chloroform, tetrachloroethylene (PCE), carbon tetrachloride, trichloroethylene (TCE), 1,1-dichloroethane, dichloromethane, benzene, toluene and xilene. A degradation superior to 80% was achieved for the majority of the compounds with air addition and 2kGy delivered dose condition. For the samples that were irradiated without air addition the degradation was higher.     

Prediction of gaseous emissions from industrial stacks using an artificial intelligence method

A novel technique based on artificial intelligence methods able to predict pollutant emission concentrations from industrial stacks is presented. This procedure combines regression and classification problems into a unified technique, named minimax decision procedure. The core of this procedure is based on the minimax probability machine regression model. Using experimental databases, the trend of pollutant emissions and the level of pollution for one industrial thermal power station stack were presented. Based on this unified technique, numerical experiments provided the estimates of concentrations of CO, NO_x, NO, and SO₂ confirming the predictive power of this procedure. Presented at the 33rd International Conference of the Slovak Society of Chemical Engineering, Tatranské Matliare, 22–26 May 2006.     

基于模糊聚类算法的工控网络控制故障检测方法研究

针对传统大型工控网络控制故障检测过程中,没有考虑故障延时特性,从而导致的故障信号检测准确率下降,检测效率降低。为此,提出一种基于模糊算法的大型工控网络控制故障检测方法。引入模糊算法,对大型工控网络控制中的故障信号延迟进行模糊化建模,通过随机时延切换设计故障观测参数和故障观测参数的残差对大型工控网络控制系统进行故障检测,克服信号延迟弊端。实验结果表明,利用本文方法进行大型工控网络控制系统故障检测,能够有效提高故障的准确率,效果令人满意。