Inverse gaussian accelerated test models based on cumulative damage

The failure of a system under environmental stress often can be described by an accelerated test model which incorporates the environmental variable L. Here, the failure of such a system at environmental level L is modeled as the first passage of accumulated damage to a critical threshold value. Assuming a discrete additive damage model leads to a Birnbaum–Saunders-type distribution for the failure time which can be closely approximated by an inverse Gaussian-type model. However, if a continuous damage model based on a Gaussian process is assumed, a more general family of inverse Gaussian accelerated test models is obtained. Three sets of failure data are discussed to illustrate the usefulness of this general family.     

当前称谓语的演变及其社会意义

本文通过对若干称谓语的演变的考察,认为称谓语的演变反映了社会生活的变迁,并具有一定导向力量,大多从经济文化发达地区向落后地区扩散。     

供应链整合跨度与强度二维互动演进机理研究

现阶段,企业与企业之间的竞争已经逐步转变为供应链与供应链之间的竞争,加强供应链管理已经逐渐成为企业获取竞争优势的重要策略,而促进供应链成员间的整合则是供应链管理成功的关键.基于以往的供应链整合研究,文章从供应链整合的两个维度——跨度与强度——出发,分别探讨供应链整合在两个维度上的演进机理,并指出供应链整合是供应链成员依赖于关系学习的两个维度相互作用、互动演进的有限过程,为供应链整合提供了新的理解角度,并辅以永辉超市供应链整合的案例加以验证.     

基于财政竞争力分析的福建省经济发展策略研究

财政对经济增长起着不可替代的促进作用,而财政竞争力也是经济综合竞争力的重要组成部分,分析福建省各地市的财政竞争力以寻找经济发展策略,对促进福建省经济有重大意义。本文对各地市财政收支现状进行初步比较,构建财政竞争力三级指标体系以分析财政竞争力水平,同时利用主成分因子得分分析财政竞争力与经济发展之间的关系。研究结果表明,厦门、福州及泉州财政竞争力较强,以这三个地市为例,从财政竞争实力和竞争潜力两个方面提出进一步提升财政竞争力的建议。     

高强混凝土高温性能研究进展

对近年来高强混凝土高温性能的研究成果进行了综述与分析,包括热工性、高温下和高温后力学性能以及高强高性能混凝土的爆裂性能。其中,高强混凝土热工性能方面的研究成果较少且研究结果离散性较大;高强混凝土力学性能方面的研究主要集中于抗压强度、抗拉强度、变形性能、弹性模量、泊松比、应力 应变关系等,而对高强混凝土结构、构件高温力学性能和温度场分析方面的研究较少;高强高性能混凝土爆裂方面的研究多集中于爆裂规律和爆裂抑制措施,对爆裂机理和微观结构的研究较少。本文分别从3个方面指出了高强混凝土高温性能研究中存在的问题和今后的研究方向,为深入研究高强混凝土的高温性能提供参考。     

基于因子分析的株洲各县市区 综合经济实力评价

市区经济发展离不开本市各个县市区经济的贡献,而本市各县市区发展之间的差异会影响整个市区的经济发展。株洲市近几年来发展迅速,但各县市区的发展却有很大差异。通过因子分析方法研究株洲市各县市区的综合经济实力问题,并根据株洲统计年鉴提出了14个反映城市综合经济实力的指标。研究结果反映了株洲市各县市区的经济发展之间差异,为株洲市经济发展提供了参考。     

未焊透缺陷安全尺寸的评价研究

未焊透是压力管道焊接接头常见缺陷之一,严重时会导致管道的承载能力明显降低,进而引发严重的安全事故。 目前我国的《在用工业管道定期检验规程》中对未焊透管道的定级是很保守的,为了减少对未焊透缺陷的返修,文章采 用非线性有限元分析的方法,通过简化未焊透管道的影响因素,并研究在不同载荷工况下管道失效模式与缺陷尺寸的关 系,获得了未焊透管道的极限载荷曲线簇;再运用塑性力学分析方法对有限元分析结果进行筛选,得到了焊接缺陷的安 全尺寸;最终通过试验验证极限载荷数值分析结果的合理性。研究结果表明含有超标焊接缺陷（如未焊透）的管道不通 过复杂应力计算和安全评定即可在保证安全前提下最大限度地使用。     

Comparison of Interval Estimators of Pr(X < Y) in the Two-parameter Exponential Distribution

We consider confidence intervals for the stress–strength reliability Pr(X< Y) in the two-parameter exponential distribution. We have derived the Bayesian highest posterior density interval using non-informative prior distributions. We have compared its performance with the intervals based on the generalized pivot variable intervals in terms of their coverage probabilities and expected lengths. Our simulation study shows that the Bayesian interval performs better according to the criteria used, especially when the sample sizes are very small. An example is given.     

铝板件自冲铆接的实验分析

本文介绍了一种新型的铝板件冲压连接技术,并根据实验结果阐述了自冲铆接的机理,分析了铆钉和模具结构对连接性能的影响,并对自冲铆接与圆点冲压连接的强度进行对比.此外,本文对这种新型连接技术的实际应用作了简要介绍.     

Paradigm lost: Reinvigorating the study of organizational culture

In spite of the importance of organizational culture, scholarly advances in our understanding of the construct appear to have stagnated. We review the state of culture research and argue that the ongoing academic debates about what culture is and how to study it have resulted in a lack of unity and precision in defining and measuring culture. This ambiguity has constrained progress in both developing a coherent theory of organizational culture and accreting replicable and valid findings. To make progress we argue that future research should focus on conceptualizing and assessing organizational culture as the norms that characterize a group or organization that if widely shared and strongly held, act as a social control system to shape members’ attitudes and behaviors. We further argue that to accomplish this, researchers need to recognize that norms can be parsed into three distinct dimensions: (1) the content or what is deemed important (e.g., teamwork, accountability, innovation), (2) the consensus or how widely shared norms are held across people, and (3) the intensity of feelings about the importance of the norm (e.g., are people willing to sanction others). From this perspective we suggest how future research might be able to clarify some of the current conflicts and confusion that characterize the current state of the field.