基于ATIS下的鲁棒连续交通网络设计问题

考虑基于ATIS下的连续交通网络设计问题,假定网络上交通需求不确定,但属于一个有界椭球闭集,应用鲁棒优化的方法建立基于ATIS下的连续交通网络设计的鲁棒模型,然后应用需求生成的算法求解此模型,数值算例表明鲁棒设计方案更加可靠。     

水解酸化—膜生物反应器处理城市综合污水

分析了水解酸化—膜生物反应器(MBR)工艺处理城市综合污水的应用可行性.结果表明,利用水解酸化-MBR工艺处理污水处理厂综合污水,除TP外,出水COD、NH4+-N、TN等指标符合《城镇污水处理厂污染物排放标准》(GB18918-2002)一级A标准,对出水再采用强化除磷措施(如投加化学除磷药剂等),可完全满足现阶段城市污水处理需要.     

A New Decision Making Model for Subcontractor Selection and Its Order Allocation

All experts agree on the importance of subcontracting. The high impact of subcontractors on the construction process means that the selection of subcontractors is a sensitive activity. Previous investigations documented the selection of subcontractors based on criteria but did not consider the number of subcontracted tasks. This paper explores allocating the best portion of tasks to subcontractors while optimizing the risk and cost in the fixed project schedule. The study's main finding demonstrates that subcontractor selection without attention to the order allocation is not a realistic approach; therefore, a hybrid model that applies continuous ant colony and fuzzy set theory is proposed.     

模块化设计塑造企业竞争优势的机制研究——以珠三角大中型制造企业为例

为研究模块化设计塑造企业创造持续竞争优势的机制,基于动态能力理论,以技术创新为中介变量,构建了模块化设计与持续竞争优势间关系的理论模型。利用来自珠三角大中型制造企业的300份问卷,应用SPSS16.0与LISREL8.7结构方程模型对问卷数据进行实证分析。结果表明模块化设计能帮助企业获得持续竞争优势,技术创新在模块化设计与品牌优势、连续先动优势和大规模定制优势的关系中均起完全中介作用。     

连续梁施工技术

徐州京杭运河特大桥梁体采用纵向、横向、竖向三向预应力体系。上部结构采用(60+100+60)m现浇预应力混凝土双线连续梁。桥下通航净高大于7.5m,满足Ⅱ级航道通航要求。本文对挂篮现浇预应力连续箱梁部分加以介绍,以供同类施工参考。     

Beta射线技术在颗粒物中的应用研究

本文通过对于Beta射线技术的分析得到一种可以用于环境空气颗粒物PM2.5连续监测过程的技术,并对该技术在不同条件下进行测试,通过所得到的数据得出该技术的适用性和技术局限性。     

Security in a sea of insecurity: job security and intention to stay among service sector employees in Turkey

This article examines the association between job security and intention to stay for those who are employed in Turkey. There is a high level of unemployment in the country and many workers there are concerned about their job security. Job security refers to the objective dimensions of continuous contract, working full-time hours and paid and unpaid overtime. Job security also refers to the subjective dimension of perceived job security. We surveyed 407 employees in banking and related sectors' call centres, five-star hotel front-line staff and airline cabin crews. Results show that objective dimensions of job security are not associated with intention to stay. However, perceived job security is significantly and positively associated with intention to stay. We recommend that human resource managers focus on the perceived job security aspect of employment to keep valuable employees with the company.     

石灰石法与双碱法脱硫除尘应用对比分析

石灰石法与双碱法是工程应用较为成熟与广泛的两种燃煤锅炉脱硫除尘技术方法。本文对两种方法的技术特点进行了较为详细的分析,并以某单位的燃煤锅炉为例,计算了两种方法的经济成本,并对二次污染、职业健康风险等因素进行了分析。通过综合权衡上述各种影响因素及两种方法的优缺点,给出了推荐的燃煤锅炉脱硫除尘方法。     

双桨叶加盘式组合干燥在沉淀硫酸钡生产中的应用

介绍了双桨叶加盘式干燥机系统的组合干燥的流程、设备结构和工作原理,对其能源的消耗利用及环境良好性进行了分析和比较,肯定了这种组合干燥系统相对于传统的闪蒸对流干燥组合在工业钡盐生产中的合理性及明显的节能效果。     

China,More than Self-Sufficient

At the moment,the whole world faces the most severe inflation in food prices in history,as grain and soybean prices climb to all-time highs.Although some observers blame the weather for the decrease in crop yields and that the growing demand for cereals used for bio-fuel production has conspired toward continuous price rises on world grain ma ket;others regard it simply as a matter of demand outpacing supply.In seven of the last eight years,world grain production has fallen behind rates of consumption.