Balancing the risk of ‘Lazearian’ interrupters and the benefits of educational and social peers: tracing parental preferences for class-size reduction

Using Danish survey data from a choice experiment, parental preferences for class-size reduction are estimated. While parents with children in large classes are willing to pay for class-size reduction, parents with children in small classes are reluctant and even express negative utility for further class-size reduction. We interpret this as parents balancing the risk of ‘Lazearian’ interrupters and the benefits of educational and social peers when forming their preferences for class size.     

The role of openness in the fuzzy front-end of service innovation

The early stages of innovation involve high levels of uncertainty, leading to it being labelled as the “fuzzy-front end” (FFE). Although openness has been identified as pivotal to innovation performance in the open innovation literature, little effort has been put into exploring its role in the FFE. Specifically, this study examines ‘openness competence’ within the FFE–i.e., the ability of a FFE team to explore, gather and assimilate operant resources from external sources by means of external searches and inter-organisational partnerships. The aim is to investigate the impact of openness competence on front-end uncertainty reduction and service innovation success. Data were obtained from a survey of 122 IT-based service innovation projects implemented by IT service provider firms in Thailand. The results suggest that openness competence positively influences both the degree of uncertainty being reduced during the FFE and the overall success of service innovations. These findings offer several implications for research on open innovation and the FFE as well as encouragement to managers to apply a more open approach to the FFE of their service innovation projects.     

Kernel-type estimators for the distortion risk premiums of heavy-tailed distributions

A new kernel-type estimator for the distortion risk premiums of heavy-tailed losses is introduced. Using a least-squares approach, a bias-reduced version of this estimator is proposed. Under suitable assumptions, the asymptotic normality of the given estimators is established. A small simulation study, to illustrate the performance of our method, is carried out.     

化工行业循环经济评价指标体系建立及应用研究

化工产业是循环经济建设的重点,循环经济评价指标体系建设是一项重要的工作。在已有的研究成果基础上,建立可以量化评价的化工行业循环经济评价指标体系,运用层次分析法,给出该指标体系的权重,通过案例分析,验证了其合理性。     

基于RFID的化工类产品仓储高效管理与实时安全监控的无线网络化综合系统研究

基于RFID技术、多类型监测(温度,湿度及各种类型的腐蚀性、爆炸性、有毒有害气体浓度的监测)集成传感器技术、无线及网络化通讯技术和计算机软硬件技术、管理技术,将它们有机整合实现对储存中化工产品的自动化高效管理与多安全性指标的实时监控,并能通过无线网络在全球范围内实时监管和查询。实现了对化工产品的出/入库自动控制、产品存放位置的精确快速确定及数量的精确快速统计和信息的快速查询。     

低碳供应链初探

在能源短缺和环境污染已成为世人极为关注的大环境下,研究低碳供应链的相关问题,符合节能减排、发展低碳经济的环保理念。文中根据供应链、低碳的概念探讨低碳供应链的内涵,讨论低碳供应链的基本特征,提出低碳度这一评价指标与之相应的指标体系,在此基础上进行了低碳供应链的集成、可见性与流程的初步设计的探讨。     

齿轮副侧隙的确定

目前齿轮副侧隙的计算仍使用材料平均热膨胀系数的方法,造成较大误差。本文根据计算所得齿厚偏差来确定侧隙的最大值及最小值。齿轮副侧隙的大小与齿轮齿厚减薄量有着密切的关系,齿厚上偏差,即齿厚的最小减薄量可以根据齿轮副所需要的最小侧隙通过计算确定,齿厚下偏差则按齿轮精度等级和加工齿轮时的径向进刀公差和几何偏差确定。齿轮精度等级和齿厚极限偏差确定后,齿轮副的最大侧隙就自然形成。     

配电网的理论线损分析

文章以南京某地区配电网实际线损为例进行分析,结果表明只有降低理论损耗,实际线损才会有明显下降。     

“十二五”约束性指标下中小企业经济发展的困境与出路

中小企业是我国国民经济的重要组成部分。中小企业的节能减排和环境保护在社会主义经济建设中有着举足轻重的地位,中小企业对资源、环境的保护不仅直接关系到我国城市的发展,同时还将影响到我国经济可持续发展。坚持节能减排,改善环境质量,履行企业的社会责任,让城市生活更美好是中小企业发展所追求的目标。     

谈计量工作是水泥生产中节能减排的重要手段

我国水泥行业在肩负发展循环经济和环境保护方面的任务极其重要,而计量工作是水泥生产中节能减排的重要手段。