CASE-BASED PRODUCT CONFIGURATION AND REUSE IN MASS CUSTOMIZATION

The increasing complexity and size of configuration knowledge bases requres the provisionof advanced methods supporting the development of the actual configuration process and design reuse.A new framework to find a feasible and practical product configuration method is presented in masscustomization. The basic idea of the appoach is to integrate case-based reasoning (CBR) with a con-straint satisfaction problem(CSP). The similarity measure between a crisp and range is also given,which is common in case retrieves. Based on the configuration model, a product platform and customerneeds, case adaptation is carried out with the repair-based algorithm. Lastly, the methodology in theelevator configuration design domain is tested.     

市政用聚烯烃管道材料的最新发展

聚烯烃是聚乙烯（PE）、聚丙烯（PP）等由碳氢化合物组成的聚合物的统称。随着上世纪50年代石油化工行业的蓬勃兴起和发展,聚烯烃管道材料因其耐腐蚀性、摩擦系数小、重量轻、易运输和安装,以及长达50甚至100年的使用寿命,已被广泛用于国内外的市政基础设施建设。然而,相比较传统的水泥、金属等管道,人们对聚烯烃管材的正确选择和使用了解较少,因此本文概述了聚烯烃管道材料的发展思路和历史,介绍了其在市政管道系统的最新应用,并提出了可持续发展的一些建议。     

Tb promoted Pd/C catalysts for the electrooxidation of ethanol in alkaline media

Various Pd-Tb/C electrocatalysts with different Pd/Tb ratios were synthesized and tested for ethanol oxidation in alkaline media. The structure and morphology of the nanocatalysts were investigated using X-ray diffraction and transmission electron microscopy. The data showed that face-centered cubic structures were formed for all the Pd-Tb/C catalysts and a well dispersion of nanoparticles on carbon black was observed. The electrocatalytic properties of the catalysts for ethanol oxidation in alkaline solution were tested by cyclic voltammetry, linear sweep voltammetry and chronoamperometry techniques. It was found that Pd-Tb/C catalysts have higher activity and durability for ethanol oxidation than Pd/C. This may be attributed to the promotion effect of Tb on OH⁻ adsorption. The highest performance was observed for 10%Pd-2%Tb/C in terms of the highest activity, stability and lowest activation energy for ethanol oxidation.     

机器翻译转换生成研究

针对机器翻译的特点，主要介绍了机器翻译转换和生成过程中的实现方法和基本技术。     

Alleviation for contact stresses in curvic attachments

This paper studied the contact stresses in curvic attachments.The principal purpose of this research is to employ a method of alleviating the fluctuating hoop stresses which can be considered to be a major contribution to fatigue failure in curvic attachments.This method entails novel precision geometry of the contacting flat on curvic which is a tactic to get appropriate arc heights in in-plane direction as well as vary radius in out-of-plane direction.The dimensional finite elements in both directions were analyzed.These analysis results indicated that significant reduction in fluctuating hoop stresses can be achieved by the proposed method,provided that the precision geometry is controlled sufficiently precisely.     

数据并行问题的性能分析及优化

针对并行处理的特点，主要提出了关于数据并行问题的优化理论和实现方法。     

汽轮机叶栅内蒸汽流动的数值模拟研究

蒸汽汽轮机叶栅内流动属于变截面管流问题.本文利用力学知识建立了叶栅机翼理论,利用Computational Fluid Dynamics （CFD）软件对蒸汽在汽轮机叶栅内的流动进行了数值模拟研究,包括稳态流动及非稳态流动,并对叶栅内部蒸汽流动的压力和马赫数进行了动态显示,分析研究验证了与流体力学有关机翼和叶栅边界层理论知识.