浅谈"平面转体法"桥梁施工技术

结合几座“平面转体法”桥梁施工的经验,简要介绍“平面转体法”桥梁施工的应用范围和类型、特点,以及“平面转体法”桥梁施工的技术控制要点。     

非对称混合梁转体桥设计研究

转体施工作为一种成熟的桥梁施工工艺,能最大限度地减少桥梁施工对既有铁路线运营的影响,但我国目前施工的转体桥基本为主梁采用单一材料的对称结构,大跨度、大吨位的非对称转体案例较少.文章依托某非对称混合梁转体斜拉桥,建立了全桥杆系模型和钢-混结合段实体模型,通过对其转体阶段、成桥阶段、成桥十年阶段受力特点的分析,为类似工程的设计提供参考.     

跨既有铁路连续箱梁转体法施工技术 ——以大沽河特大桥为例

青连铁路大沽河特大桥一联(48+80+48)m连续箱梁跨越既有铁路,采用转体法施工工艺,本文简明扼要的介绍了该梁转体施工技术,对转体系统安装、梁段施工、转体等工序进行了阐述.     

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。     

浅谈某跨铁路预应力混凝土桥转体施工质量控制

某跨铁路预应力混凝土桥施工跨度为71m+71m,转体总重量约为7083吨,采用自平衡体系的平面转体施工工法。文章对桥梁转体施工的施工工艺,转体施工测量放线,球铰加工安装、上转盘施工,现浇梁体支架搭设及堆载预压,试转体、正式转体施工等各主要环节质量控制进行了分析总结。     

浅谈某跨铁路预应力混凝土桥转体施工质量控制

某跨铁路预应力混凝土桥施工跨度为71m+71m,转体总重量约为7083吨,采用自平衡体系的平面转体施工工法。文章对桥梁转体施工的施工工艺,转体施工测量放线,球铰加工安装、上转盘施工,现浇梁体支架搭设及堆载预压,试转体、正式转体施工等各主要环节质量控制进行了分析总结。     

严寒地区跨多条高铁T构转体关键参数测试分析

目前,跨铁路桥梁采用转体法施工已成为首选。本文结合吉林市雾凇高架桥主桥20′墩处T构转体施工技术,为确保转体的顺利实施,介绍了转体前对纵向不平衡力矩、摩阻力矩、摩阻系数等参数进行测试方法,确定了转体平转姿态,对严寒地区类似工程提供一定借鉴经验。     

桥梁大吨位(100T)砂筒制作与检验

在工程施工中连续箱梁、简支箱梁及边跨现浇直线段多采用支架现浇施工方式,施工方案一般采用梁柱式支架,该支架须设置卸架设备,采用砂筒作为卸架设备之一,根据当今桥梁现有施工经验,砂筒承载能力仅达50T;但现在桥梁设计及施工中经常会碰到大吨位的砂筒作为常用卸架设备。     

桥梁转体施工关键技术研究及应用

转体施工作为桥梁建造的一项新技术,近些年在桥梁施工领域的应用范围不断扩大。本文针对于其技术原理及应用优势,结合实际案例,重点阐述转体施工的关键技术、力学试验、转体参数计算等内容,以丰富转体理论研究资料,为转体桥梁施工提供参考。     

引江济淮特大桥转体梁称重及配重技术研究

越来越多上跨铁路桥梁为了尽量减少对铁路正常运营的影响,上构梁体采用转体法施工。新建合安铁路合九联络线引江济淮特大桥主跨以(32+48+32)m转体连续梁的形式上跨宁西铁路,本文结合引江济淮特大桥转体梁的施工实例,详细阐述了在转体前对转体梁进行称重试验的原理、步骤、计算公式及配重方法,以使转体梁在转体时处于良好的平稳状态,确保了施工安全及铁路运营安全。     

Incumplimiento del salario mínimo en Europa central y oriental

En este estudio se analiza el incumplimiento del salario mínimo durante el periodo 2003–2012 en diez países de Europa central y oriental con salario mínimo obligatorio nacional. A partir de los datos de EU‐SILC y la metodología propuesta por Bhorat, Kanbur y Mayet (2013), se cuantifica la incidencia y magnitud del incumplimiento. Se realizan análisis de regresión sobre determinantes individuales, laborales y macroeconómicos. Aunque la incidencia permanece relativamente baja, los trabajadores a los que se dirigen las políticas de salario mínimo parecen los más expuestos a su incumplimiento. Con el tiempo, una mayor incidencia se asocia a una razón más alta entre salario mínimo y salario medio.     

Cultural Economy Planning in Creative Cities: Discourse and Practice

While a growing body of research analyses the functional mechanisms of the cultural or creative economy, there has been little attention devoted to understanding how local governments translate this work into policy. Moreover, research in this vein focuses predominately on Richard Florida's creative class thesis rather than considering the wider body of work that may influence policy. This article seeks to develop a deeper understanding of how municipalities conceptualize and plan for the cultural economy through the lens of two cities held up as model ‘creative cities’ — Austin, Texas and Toronto, Ontario. The work pays particular attention to how the cities adopt and adapt leading theories, strategies and discourses of the cultural economy. While policy documents indicate that the cities embrace the creative city model, in practice agencies tend to adapt conventional economic development strategies for cultural economy activity and appropriate the language of the creative city for multiple purposes.     

Input/output ranges and performance: an examination of US machine tool producers

Despite the establishment of high-tech multinational enterprises (MNEs) in Ireland since the late 1950s, the country did not succeed in closing the technological gap with most of its EU counterparts. The weak National System of Innovation (NSI), and in particular low business and government R&D levels, combined with a lack of research and technology linkages between MNEs and indigenous firms, explain these poor results. However, the Shannon region in the West of the country presents some specific institutional characteristics that could theoretically make the region a strong technological enclave. The various actors in the region - i.e. the administrative, financial, political and research institutions, as well as the business organizations - have indeed infused a new type of economic development. After a brief review of the available concepts and models articulated around these actors and their interrelationships, the paper analyses whether the Shannon region, taken as an illustrative example, mirrors a specific economic and technological localized setting. The study is based on a survey of indigenous and foreign firms.     

Sixty years of discrimination and diversity research in human resource management: A review with suggestions for future research directions

This article reviews discrimination and diversity research published in Human Resource Management (HRM) over the past 60 years. While discrimination and diversity are very different constructs, it is often informative to study them together, because when people recognize each other's diversity, this can result in bias, stereotyping, and discrimination. We conducted bibliographic searches for terms related to discrimination and diversity as well as a manual search through every title and abstract published in HRM over the last 60 years to assess article relevance. The search resulted in 135 research articles with 136 unique studies (i.e., samples) which are reviewed in this article. Sex and race are the demographics that have been examined the most in HRM, while religion has been examined the least. Moreover, the number of studies examining lesbian, gay, bisexual, transgender, and queer (LGBTQ) employees in the workplace in HRM has grown quickly within the past 10 years, culminating in a recent meta‐analysis. Our review looks at some of the earliest research published, the most recent research published, and the overall trends we identified in the research over the years for both discrimination and diversity articles. We then make future research suggestions and recommendations to advance the study of discrimination and diversity in the coming years.     

Multinomial distributions applied to random sampling of particulate materials

When sampling a batch consisting of particulate material, the distribution of a sample estimator can be characterized using knowledge about the sample drawing process. With Bernoulli sampling, the number of particles in the sample is binomially distributed. Because this is rarely realized in practice, we propose a sampling design in which the possible samples have a nearly equal mass. Expected values and variances of the sample estimator are calculated. It is shown that the sample estimator becomes identical to the Horvitz–Thompson estimator in the case of a large batch-to-sample mass ratio and a large sample mass. Simulations and experiments were performed to test the theory. Simulations confirm that the round-off error due to the discrete nature of particles is negligible for large sample sizes. Sampling experiments were carried out with a mixture of PolyPropylene (PP) and PolyTetraFluorEthylene (PTFE) spheres suspended in a viscous medium. The measured and theoretical variations are in good agreement.     

The Early History of the Cumulants and the Gram-Charlier Series

The early history of the Gram-Charlier series is discussed from three points of view: (1) a generalization of Laplace's central limit theorem, (2) a least squares approximation to a continuous function by means of Chebyshev-Hermite polynomials, (3) a generalization of Gauss's normal distribution to a system of skew distributions. Thiele defined the cumulants in terms of the moments, first by a recursion formula and later by an expansion of the logarithm of the moment generating function. He devised a differential operator which adjusts any cumulant to a desired value. His little known 1899 paper in Danish on the properties of the cumulants is translated into English in the Appendix.     

Capturing the Implications of Services Trade Liberalization

This paper evaluates the impact of service sector trade liberalization on the world economy by a ten-region, eleven-sector CGE model with import embodied technology transfer from developed countries to developing countries. Simulation results show that service sector trade liberalization not only directly affects world service production and trade, but also has significant implications for other sectors in the economy. The major channel of the impact is through inter-industry input-output relations and TFP growth induced from services imported by developing countries from developed countries, which may be embodied with new information and advanced technology.     

Performance appraisal and culture: practice and attitudes in Hong Kong and Great Britain

This article compares the practice of and attitudes towards performance appraisal for managerial and professional staff in Hong Kong and Britain, and considers the extent to which actual practice and employee preferences are in alignment. Findings suggest that appraisal may be more widespread in Hong Kong than in Britain. However, British appraisal tends to be more participative and to place greater emphasis on discussing objectives, development and career plans. Hong Kong appraisals appear to be more directive and Hong Kong respondents perceive a higher level of 'negative' appraiser behaviour. In spite of this, Hong Kong respondents show if anything slightly more confidence in the utility of appraisal than do British respondents. They show stronger support for appraisal's use for reward and punishment and less support for the objectives-setting and training and development uses than do the British sample. Hong Kong respondents are more likely than their British counterparts to favour involving a more senior manager in appraisal, and they are less likely to prefer more frequent appraisals. There was little evidence that Hong Kong respondents had a stronger preference for group-based appraisal criteria, although they did show more support than the British sample for the use of personality as a basis for appraisal. Overall, the suggestion is that appraisal has been adopted in Hong Kong organizations but that the practice of appraisal has been adapted to suit the cultural characteristics of the society.     

Narrative construction of expatriate experience and career cycle: discursive patterns in Finnish stories of international

Expatriate experience is not only a disconnected occasion for cross-cultural anxiety and adjustment but also an important event in the process of self-development and learning. Following this view and arguing for a discursive approach, the paper focuses on ways in which expatriates themselves tell and interpret their development and movement across expatriate career cycle. Meaning systems connecting expatriate job with previous and following work experiences in career stories of Finnish engineers and managers were identified using a combination of narrative and discourse analysis. No evidence was found of an autonomous expatriate discourse but, in contrast, expatriate career cycle was narrated using available organizational repertoires of development and career. Describing and discussing the meaning-making properties of three identified discourses - bureaucratic, occupational and enterprising - the paper emphasizes the organizational environment of expatriate experience while acknowledging the limits of these contemporary career vocabularies in addressing individual learning and change in cross-cultural settings.     

Internet professionals: job skills for an on-line age

The paper explores the increasing popularity of the Internet technology Singapore. It argues that the diffusion of Internet technology to South-East Asia would create new duties and responsibilities for human resource (HR) managers. One such duty is the identification of the skills which professional Internet staff would need to perform their work effectively in organizations. Using a triangulation research method, empirical study has identified the new professional Internet jobs which have emerged the IT industry in Singapore and the skills that professional Internet personnel require do their jobs effectively. Analysis of the findings indicates that professional Internet skills involve both technical and creative abilities and that, in explaining or defining professional Internet skills, it is necessary to use both the technical and the social conceptions of skill. This argument is based on the view that the creative skills include tacit skills so that a definition based solely on the technical conception of skill cannot capture the various dimensions of Internet skills. The implications of the research findings for human resource managers are raised.