简洁高效的钢筋优化下料方法

本文依据日常生活中使用的筛子工作原理,首次提出了“智能筛”优化下料方法,使得复杂的优化数学理论问题变得直观易懂,且具有非常理想的鲁棒性。经与多个文献中使用的算例比较,优化效果十分显著。该方法应用于平法钢筋下料计算机辅助设计系统中,实现钢筋优化下料、加工、库存一体化计算机管理,在实际应用中取得了显著效果。     

钢筒仓倒塌事故和贮料流动影响(上)

通过对某钢筒仓倒塌事故的剖析, 指出倒塌的根本原因是由于吊挂钢漏斗的埋件设计失误所致, 对倒塌的过程和机理作了全面的论述, 提出了连接钢漏斗的埋设件正确的计算方法和构造方案。并引用了国内外研究成果详细论述了贮仓中贮料的各种流动方式及其压力变化规律、偏心卸料对料压力的影响、不对称荷载对贮仓的影响。     

聚类分析在股票分析中的应用

目前在中国股票市场上有近2 000 支股票, 进行股票投资的时候, 需要对股票进行分析和选择, 投资那些获利能力强, 财务指标较好的股票, 以减少投资风险。但是股票评价指标又有许多种, 他们的含义各有不同, 如何把各种指标综合在一起就变得非常重要。应用聚类分析方法对股票市场石油化工板块进行了分析和分类。聚类分析能综合多项财务指标来反映上市公司的盈利能力和发展水平, 为分类和评估公司的优劣提供了很好的依据。     

New River Village

Social affordable housing is so often the poor relation of any private development, allocated the poorest plot with the least attractive aspect. Bruce Stewart describes how at Hornsey in north London, Stock Woolstencroft has transcended these problems with considerate spatial organisation and security management. Copyright © 2007 John Wiley & Sons, Ltd.     

Assessing the impact of oil prices on firms of different sizes: Its tough being in the middle

Recent empirical research has found evidence of a relationship between oil price movements and stock prices. Most published research investigates the relationship between oil price movements and stock prices using either economy-wide measures of stock prices or industry sector measures of stock prices. An important question that has largely gone unanswered relates to the relationship between oil prices and stock prices when the size of firms is allowed to vary. Relative to large firms, do oil price movements have larger or smaller impacts on the stock prices of small- or medium-sized firms? The answer to this question could have important policy implications that affect economic growth and prosperity. In this paper, a panel of firms is followed over a 17-year period to investigate the relationship between oil price movements, firm size, and stock prices. Evidence is found that shows the relationship between oil price movements and stock prices does vary with firm size and the relationship is strongest for medium-sized firms.     

对我国职工持股制的理论思考

介绍了职工持股制在我国产生、发展的历程，探讨了职工持股制的经济功能和基本特性。在此基础上，针对我国职工持股制的发展现状，提出了进一步规范发展职工持股制的若干对策。     

Simultaneous determination of flavor enhancers in stock cube samples by using spectrophotometric data and multivariate calibration

Spectrophotometric data followed by a suitable treatment of chemometric analysis were used for the simultaneous determination of monosodium glutamate (MSG), guanosine 5′-monophosphate (GMP) and inosine 5′-monophosphate (IMP) in stock cube samples, without any previous extraction step. By this way, the overlapping of the absorption spectra was resolved using a PLS-1 model. The concentration for experimental calibration matrix were varied between 5.03–34.2 μg mL⁻¹ for IMP and GMP, and 448–1399 μg mL⁻¹ for MSG. The relative errors of prediction (REPCV %) were 1.8, 2.8 and 3.1 for IMP, GMP and MSG, respectively.     

新型活性染料印花用原糊的探讨

对采用天然类糊料和化学类糊料，经合理优化配比和乳化而制成的新型活性染料印花复合原糊进行了讨论。该印花原糊保留了海藻酸钠糊料的各项优异功能，具有更好的结构粘度、较好的渗透性能、耐碱稳定性、透网性和抱水性等。经实际应用后，不仅提高了表观给色量，而且获得了良好的印制效果，即块面轮廓清晰、线条光洁，是目前理想的活性染料的印花原糊。     

抗雾剂对基础油油雾性能的影响

考察了抗雾剂对基础油抗雾性能的影响,抗雾剂的效果取决于在基础油中的分散性和添加量,抗雾剂分散得越好,添加量越高,抗雾效果越好.