基于遗传算法的核函数参数优化

核主分量分析是一种输入输出特征非线性变换技术。选择最优或接近最优的非线性变换核函数参数,使类的可分性测度最大,是KPCA应用于特征提取的关键。本文采用高斯变异遗传算法作优化技术,实现了KPCA和GA的集成,适合核函数参数的优化选择。仿真表明,该技术可行、有效。     

Ex-post full surplus extraction,straightforwardly

Consider an estimate of the common value of an auctioned asset that is symmetric in the bidders’ types. Such an estimate can be represented solely in terms of the order statistics of those types. This representation forms the basis for a pricing rule yielding truthful bidding as an equilibrium, whether bidders’ types are affiliated or independent. We highlight the link between the estimator and full surplus extraction, providing a necessary and sufficient condition for ex-post full surplus extraction, including the possibility of independent types. The results offer sharp insights into the strengths and limits of simple auctions by identifying the source of informational rents in such environments. Harstad acknowledges hospitable accommodation by the Fuqua School of Business, Duke University, and the Olin School of Business, Washington University in St. Louis, during parts of this research. We are grateful for comments and suggestions from Richard McLean and Jeroen Swinkels.     

高硫减压渣油加工方案的技术经济比较

对中国石化齐鲁分公司高硫减压渣油两种生产方案,即减压深拔工艺生产重交沥青和VRDS-FCC组合工艺生产轻质油品进行技术经济比较.结果表明:在公司裂解原料不能完全自给的前提下,VRDS-FCC组合工艺的单位利润优于减压深拔工艺,但随着重交沥青价格的上升,VRDS-FCC组合工艺的优势将逐渐减弱.     

因子分析中公因子提取方法的比较与选择

近代和现代统计分析方法中,因子分析是最重要的方法之一。因子分析中有7种提取公因子的方法,其中主成分法、极大似然法和主轴因子法是常用的方法。在着重解析这三种方法基本数学过程的基础上,对其适用条件和应用注意事项进行了比较,最后结合实例比较了不同公因子提取方法的结果,并对提取公因子过程中出现的问题给出了可能的解决办法。     

海藻酸钠提取工艺的研究进展

讨论了影响海藻酸钠提取的主要影响因素,综述了目前海藻酸钠提取工艺的研究进展,并对其作了简要分析比较,着重探讨了海藻酸钠提取工艺中存在的问题,结合目前国内外对海藻酸钠提取工艺的研究,展望了海藻酸钠的发展前景。     

A systematic mapping study on enterprise architecture mining

Enterprise architecture allows companies to deal with digital transformation through the proactive presentation and alignment of business and IT in a holistic manner. One important challenge is EA modelling since it is time-consuming (thus expensive), error-prone, and biased owing to experts’ subjective opinions. This challenge might consequently be addressed through automatic EA modelling. We conducted a systematic mapping study to classify and evaluate the research concerning EA mining proposals developed specifically for TOGAF and Archimate. After analysing results, we concluded that the research field is not sufficiently mature and further research on EA mining is necessary.     

满山香提取工艺的研究

文章采用正交试验设计方法,选择药材的破碎度、乙醇倍数、乙醇浓度和渗漉速度4个因素,每个因素选3个水平对满山香渗漉提取工艺进行最佳工艺条件的研究。实验结果表明,满山香细粉的颗粒直径为1～2mm、乙醇量为药材量的6倍、乙醇浓度为60%、渗漉速度4～5ml/min为最佳提取工艺参数。该工艺方法对满山香的提取及开发应用具有一定的指导意义。     

河南天冠燃料乙醇有限公司日处理1400 t玉米提胚车间设计

玉米经破渣后,经过初步分级将含胚玉米渣分离出来,经提胚、压胚、筛选等工序,将玉米胚芽提取出来,玉米胚芽再经精选可以得到较为纯净的胚芽,用于榨油或者其他用途.     

关于矿产资源开采顺序的经济分析与政策调控

在局部均衡的理论框架下,研究了资源矿山拥有者对不同品位矿山的最优开采顺序,得出如果以利润现值最大化为目标,那么矿山拥有者必须按照开采成本的递增顺序开采,并分析了税收对开采顺序的影响,指出政府可以通过征收资源收入税改变资源的开采顺序.     

超声波辅助提取黑豆油及其脂肪酸组成分析

采用超声波辅助法,以石油醚为溶剂提取黑豆油。考察了提取时间、提取温度、料液比和超声波功率对黑豆油提取效果的影响。结果表明,提取黑豆油的优化工艺条件为：提取时间9rain,提取温度58℃,料液比1：9,超声功率110W,在此条件下,黑豆油得率达到83．83％。对黑豆油进行GC—MS分析可知,黑豆油的主要脂肪酸有棕榈酸19．24％、亚油酸46．28％、油酸18．62％和硬脂酸7．3％等,其不饱和脂肪酸含量达68．98％。