转体T构梁段挂篮悬壁浇注施工上下转盘临时锁定技术

德安县共安大桥转体重量14510t、转动体长123m,是目前已转体的跨度最大、重量最重的公路预应力混凝土连续梁。其设计采用先挂蓝悬臂浇筑连续梁、然后平转,最后合龙成桥的施工方法。由于并置于同一墩柱上大吨位、大跨度双幅曲线连续梁桥先悬灌、后转体的施工技术尚无成熟经验可借鉴。本文结合江西省德安县共安大桥主桥的施工实例,针对连续梁悬臂浇注施工再转体的特点对上下转盘临时锁定技术进行了研究和总结,将对以后同类的桥梁建设提供一种思路。     

由我国上市公司债务处置引起的思考

债务比率上限作为我国公司上市或配股的重要约束条件之一,使上市公司对债务处置“乐此不疲”,但不管从筹资者、投资者、证券监管还是证券市场角度进行分析,债务处置的作用均不尽如人意,进而提出债务上限规定的不唯一性和连续性行为规范监管的建议,来维护和保障多方的利益。     

PUBLIC CHOICE THEORY AND HOUSE OF LORDS REFORM

By revealing the propensity of elected governments to indulge in self‐interest at the expense of the people's liberty, public choice theory provides powerful arguments in favour of an appointed House of Lords rather than an elected upper chamber.     

Controlling the Urban Fabric: The Complex Game of Distance and Proximity in European Upper‐Middle‐Class Residential Strategies

This article presents an open discussion of the processes of urban secession and gentrification in contemporary European cities, arguing that intergroup social dynamics in urban spaces are generally more complex than either extreme mutual avoidance or the colonization of neighbourhoods by the wealthiest groups. We analyse the residential strategies of urban upper‐middle class managers in various European metropolitan areas through in‐depth semi‐structured interviews to argue that these groups develop complex strategies of proximity and distance in relation to other social groups. The development of these ‘partial exit’ strategies takes place through specific combinations of practices that allow groups to select the dimensions they are willing to share with other social groups, and those in which they prefer a more segregated social environment for themselves and their families. The responses of our interviewees were consistently more nuanced and complex than suggested by a simplistic theory about their drive to withdraw from society, forcing us to develop more sophisticated conceptual frameworks to account for the growing prevalence of multi‐layered identities and spheres of reference and solidarity, specific combinations of elective segregation and local involvement, and more active patterns of mobility combined with local embeddedness.     

长江上游生态屏障建设的投入机制研究

长江上游生态屏障建设关系中下游地区的生态安全,因而,保障生态屏障建设质量至关重要。然而,长江上游生态屏障建设资金严重的供需失衡,直接影响生态屏障建设的质量。本文分析了长江上游生态屏障建设投入机制存在的主要问题及原因,提出了完善生态屏障建设投入机制的对策措施和政策建议。     

积分第一中值定理的证明与推广

本文根据积分上限函数的性质利用微分中值定理证明了积分第一中值定理,用改进的介值定理证明了ξ∈(a,b),并推广了积分第一中值定理。     

CEOs who have COOs: contingency analysis of an unexplored structural form

We use contingency theory to examine, for the first time, the incidence and effectiveness of CEO/COO duos. We argue that industry dynamism, extraordinary organizational task demands, and the CEO's own professional limitations will influence the decision to have a COO, as well as its effect on performance. Based on a large 10‐year sample, we find some support for the contingency view in explaining the presence of COOs; we particularly find that CEOs who lack experience in operational activities and in managing the focal firm are relatively likely to have COOs. We find, however, essentially no support for the contingency view in explaining when COOs are most beneficial. Instead, we find strong evidence of a very substantial negative main effect: CEOs who have COOs deliver lower organizational performance than those who do not. Copyright © 2004 John Wiley & Sons, Ltd.     

Stacking the deck: the effects of top management backgrounds on investor decisions

Young firms going public are dependent upon the decisions of investors for a successful public offering. Yet convincing investors to invest is not easy, as young firms have limited track records and, thus, face challenges associated with gaining legitimacy in their respective industries. This paper examines ways in which select information about firms undertaking an initial public offering (IPO) can affect investor decisions. Building upon recent research on upper echelons and signaling theory, we propose that the composition of a firm's top management team can signal organizational legitimacy that in turn affects investor decisions. In the context of young firms undertaking an IPO, such signals are critical, especially when objective measures of firm quality are not easily available. We introduce a typology of signals of organizational legitimacy to elaborate on our hypotheses. Analyses of a comprehensive set of data on the career histories of the top management teams of young biotechnology firms show that investor decisions are affected by the extent to which a firm's top management team has employment affiliations with prominent downstream organizations (e.g., pharmaceutical companies), with a diverse range of organizations, and upon the role experience of one key member of the top management team—the Chief Scientific Officer. We assess and find that these effects are not mediated by the prestige of a firm's lead underwriter. We conclude with a discussion of the implications of our study for strategy research on upper echelons and organizational legitimacy. Copyright © 2006 John Wiley & Sons, Ltd.     

家族企业家双重性特征与家族企业融资决策——来自中小家族上市公司的经验证据

以高阶理论为依据,从管理者的角度研究家族企业家双重性特征与家族企业融资决策的关系。基于2004~2007年在深圳中小企业板上市的家族企业样本的实证研究发现,家族企业家的性别、任职年限、政治身份、企业家的风险倾向、控制权偏好与家族企业融资决策之间存在显著的相关性;实证研究没有发现企业家年龄与融资决策的相关性。本研究对高阶理论在我国中小家族企业中的应用是一个有益的补充,该研究的启示意义在于,研究家族企业的融资决策时,必须考虑到企业家的相关特征。同时,本文对于更好地理解家族企业的融资行为,优化家族企业的融资结构具有重要的指导作用。     

长江上游地区资源环境承载力的实证分析

随着经济、社会的飞速向前发展,人类对资源环境提出了严重的挑战,资源环境承载力面临着巨大的压力。文章通过对长江上游地区资源环境承载力的实证研究与量化分析,对长江上游地区资源环境承载力的现状进行了评价。研究结果表明,长江上游地区资源环境承载力状况达到全载或超载状态,形势依然严峻。最后,针对分析结果提出提升长江上游地区资源环境承载力的可持续发展策略。