铁路隧道工程湿喷技术研究

湿喷技术是隧道机械化作业的一个重要环节,对喷射混凝土施工质量起到关键性作用。通过对喷射混凝土原材料、配合比设计、湿喷机特点分析、施工过程控制进行全面分析总结,得到了湿喷工艺的关键控制要点,为隧道喷射混凝土施工提供了技术参考。     

喷射混凝土在隧道支护中的应用探讨

本文通过结合某隧道情况，对隧道洞身Ⅳ级围岩初期支护采用C25喷射混凝土，Ⅴ级围岩采用C30喷射混凝土，均采用湿喷工艺。总结出该隧道支护中应用湿喷混凝土施工技术措施，提出合理的混凝土拌制技术以及喷射混凝土工艺，为同类工程提供参考借鉴。     

浅谈隧道初期支护湿喷混凝土施工

混凝土湿喷工艺由于其“综合成本低、社会效益好、环境污染小”的优点在隧道施工中逐步占据了主导趋势，并成为铁道部强制要求实施的工艺。混凝土湿喷施工能巨大地改善隧道施工作业环境。缩短喷射混凝土的作业循环，更尤为重要的是以湿喷工艺为依据构建喷射混凝土质量保证体系，以确保喷射混凝土质量符合设计要求。本文结合新岭隧道湿喷施工为例论述了隧道初期支护湿喷混凝土施工工艺流程及质量控制要点。     

分析挂模湿喷混凝土技术在隧道施工中的应用

随着业界的不断研究和发展隧道施工中的混凝土喷射技术,研发出了许多的施工工艺,挂模湿喷混凝土技术就是其中的一种.本文主要对挂模湿喷混凝土技术的配合比设计,施工工艺和施工效果进行简单分析.     

隧道工程中干喷与湿喷的经济技术比较

本文介绍了隧道工程喷射混凝土施工中干喷工艺与小型湿喷机湿喷工艺间从经济性、时效、回弹率等各方面进行了综合比较,为企业决策者提供了工艺选择的技术依据,并给出了推行湿喷可行性方案.     

纳米高分子减水剂提高喷射混凝土功效应用技术

针对传统外加剂喷射混凝土回弹大、速凝剂超耗、易堵管、喷射时间久的问题,结合本工程特点,笔者在新建玉溪至磨憨铁路施工时,在喷射混凝土中加入纳米高分子减水剂,利用高分子减水剂的物理化学作用机理,采用湿喷工艺,将隧道初期支护的喷射混凝土回弹量降低到5%,将喷射混凝土成本每方降低130元左右,同时每喷射循环降低喷射时间1.5小时左右,解决材料不稳定造成喷射混凝土堵管问题,大大提高经济效益,并节省喷射时间,提高工程质量、进度。     

湿喷技术在隧道施工中的应用

混凝土湿喷技术在隧道喷砼中推广使用多年,但目前仍有许多单位习惯采用干喷。文章以四川省达洲市黄家湾隧道进口湿喷混凝土为例,主要论述湿喷技术特点及工艺,并与干喷从质量控制、经济效益上作比较,使砼湿喷技术能得到进一步重视使用。     

阿里瓦湿喷机组在贵广铁路岩山隧道的应用

提高隧道工程混凝土喷射施工效率和施工质量是隧道施工的关键问题之一。文章对用于贵广铁路岩山隧道的阿里瓦湿喷混凝土的优越性、施工工艺、操作要点等进行了介绍,为类似工程施工提供参考借鉴。     

隧道工程湿喷混凝土施工技术探讨

湿喷混凝土技术具有回弹量低、质量易管理、性能稳定、劳动强度低、机械化程度高、作业面安全隐患小等优点,目前正逐步取代干喷混凝土技术。文章结合工程实例,对隧道工程湿喷混凝土施工技术做一些探讨。     

隧道工程初支湿喷混凝土回弹率控制施工技术研究

目前隧道施工随着施工技术、设备机具及施工理念的发展和改进,隧道初支湿喷混凝土施工工艺具有综合成本低、社会效益好、环境污染小的特点,契合以人为本、构建和谐社会的现代发展理念,极大的改善了隧道施工环境,得到了越来越多的推广和应用,甚至成为隧道初支混凝土施工的规范性选择,但由于湿喷混凝土不可避免的会产生回弹现象,造成湿喷混凝土浪费,施工成本增加,因此控制隧道初支湿喷混凝土回弹率就成为了隧道施工成本控制的首要工作,本文就隧道初支湿喷混凝土回弹产生的过程和原因进行了分析和研究,确定了控制回弹率的几个主要因素,为以后隧道初支湿喷混凝土施工回弹率控制提供参考和借鉴。     

Development in Information and Communications Technology (ICT) Statistics at the Australian Bureau of Statistics

This paper outlines the ICT statistical developments that the ABS has undertaken over recent years. These developments have been on both the supply side (ICT industry) and the demand side (use of IT by sector). The content of ABS ICT surveys has changed significantly over the last few years and are expected to develop further in line with industry changes and emerging policy needs.
Recent developments in household collections have been the inclusion of IT use questions in the 2001 Census of Population and Housing and in various ABS social surveys such as Children's Participation in Culture and Leisure Activities. Annual business IT use surveys are now conducted and include topics such as Internet commerce and IT security. Biennial ICT industry surveys are conducted to provide data on ICT production, imports and exports, ICT industry employment, performance and structure information. An Internet activity survey is run every six months and provides regional Internet access details and infrastructure details on Internet service providers.
A major development for 2002–03 will be the compilation of an ICT satellite account. ABS intends to produce an ICT Information Development Plan to guide its future statistical development work in the ICT field.     

Value at Risk in the Suburbs: Eminent Domain and the Geographical Politics of the US Foreclosure Crisis

Several US counties and local governments have recently considered a novel solution to the foreclosure crisis. They plan to use eminent domain to compel the owners of mortgage debt—and specifically of private‐label mortgage‐backed securities—to sell the debt to the government at a price reflecting the loan's market value. The government would then restructure the debt and resell it to new investors. The plans are striking because—in contrast to both development‐driven eminent domain and the federal subprime bank bailout—they would force investors to assume asset devaluation and increased long‐term risk. Notably, the plans have emerged as an instance of financialization‐focused politics in suburbs and suburban cities of color, specifically majority‐black and ‐Latino/a suburbs. Local support for the plans, we argue, is rooted in the long‐term disinvestment of these ‘suburbs of exception', which became targets of subprime lending and eventually sites where the ‘financial exception' has been localized. But these demographic shifts, fragmentation and fiscal pressures have at the same time created a suburban political terrain in which the plans have gained their strongest political support.     

Towards a Theory of Serendipity: A Systematic Review and Conceptualization

Serendipity – the notion of making surprising and valuable discoveries – plays a major role in the success of individuals and organizations alike. Previous research has established the importance of serendipity and identified important individual- and organizational-level antecedents. However, the literature has been dispersed and the boundaries of the concept have been blurry, leading to a lack of conceptual clarity and structure, and thus limiting validity and managerial actionability. Based on a systematic literature review, I synthesize existing management-related research on serendipity and explicate the emergence and composition of serendipity in the organizational context. I first identify three necessary conditions that differentiate serendipity from related concepts such as luck or targeted innovation: agency, surprise, and value. Then, I draw from the literature on sensemaking, event-based theorizing, and quantum-based approaches to management to conceptualize the process of cultivating serendipity in the organizational context as a process of enabling potentiality and materialization, and develop a multi-level theory of (cultivating) serendipity. This conceptualization contributes to our collective understanding of how, why, and when (i.e., under what conditions) organizations can leverage the value in the unexpected, which opens up fruitful avenues for further research.     

Accountability of NGOs in Bangladesh A critical overview

NGOs in Bangladesh have been recognized as effective change agents in the socio-economic arena throughout the world. Their contributions in micro credit, non-formal education and primary health care are widely known. NGOs play a significant role in society. NGO accountability, as a result, has become a critical issue. NGO accountability in Bangladesh has been examined here in relation to patrons, clients and themselves. Of the three relationships only accountability to patrons is in a near satisfactory state. Accountability to clients is handicapped by lack of opportunities of beneficiaries to participate meaningfully in NGO policy making. Accountability to themselves is adversely affected due to the adherence to a strictly hierarchical system and the influence of founding and charismatic NGO leaders.     

Towards an Asian model of human resource management? A comparative analysis of China,Japan and South Korea

There has been much discussion regarding the possible decline and weakening of national systems of human resource management (HRM). Yet, culture and institutions are often cited as the major stumbling blocks to this outcome. Such constraints may dissipate in the analysis, particularly if ‘regional clusters’ are considered where geographic and cultural closeness and ‘openness’ to similar economic pressures exist. In such cases, it might be postulated that convergence in HRM will occur. We argue that China, Japan and South Korea represent such a cluster. This article examines these countries, to see if a degree of convergence is taking place and if it is towards an identifiable ‘Asian’ model of HRM. A model of change is presented that distinguishes between levels of occurrence and acceptance. Details of the development and practice of HRM in each country are then set out. The article ends with a discussion and implications section and a brief conclusion.     

Ansätze und Ergebnisse anglo-amerikanischer M&A-Forschung

Based on a review of established U.S. management journals (1995–2003), six schools of thought are identified within the Anglo-American M&;A research: “Capital Market”, “Principal/Agent”, “Industrial Organization”, “Organizational Behavior”, “Human Resources” and “Strategic Management”. The literature review shows that the definition of M&;A success, the methods applied, and insights from empirical research differ according to the respective school of thought. Empirical studies focus on the resource combinations of merger partners, the specific circumstances of merger negotiations, and on integration management as antecedents of merger performance. Unfortunately, empirical findings have not yet provided reliable explanations for M&;A success. Based on the current state of Anglo-American M&;A research, the authors discuss implications for business practice, identify research gaps, and propose areas for future research.     

Introduction of New Technology with a Sound Transition of the Input-Output Structure

We examine the general equilibrium repercussions associated with the introduction of new technologies, using the generalized Leontief system that allows technological substitutions. We show that an untested introduction of cost-increasing technologies in any industry may result in creating a non-productive technological structure that does not satisfy the Hawkins-Simon condition, following the autonomous dynamic adjustment process with structural transitions in the economic system. Therefore, we propose a practicable control scheme of introducing cost-increasing technologies that strictly avoids the creation of non-productive structures in all periods of structural transition, using the available information on the ex ante technological structure.     

The Creation of the Office for National Statistics

A new Office for National Statistics was created in the United Kingdom in 1996 following a series of developments designed to strengthen the relevance and integrity of statistics. This paper describes these fundamental changes and sets out a blueprint for future progress. It also sets current developments in the United Kingdom in an historical and international context.     

What helps? Women engineers' accounts of staying on

We have considerable understanding of the obstacles that women engineers encounter and the reasons that they leave the field, but we know less about what enables them to remain. Adopting an interpretivist approach, this article examines how a group of British women engineers in two FTSE 100 companies account for “staying on” in their male‐dominated work settings. We delineate four specific forms of help that facilitate women's retention in the field. We argue that exposure to help leads to women developing a habitus that enables them to continue working in engineering. To conclude, we draw on our findings to outline HR practices that will facilitate supportive relationships in the workplace and pave the way towards developing more positive organisational climates.     

论现代物流企业的发展观

物流业经过诸多年的发展目前已经成为最热门的行业之一,物流企业的注册数量也与日俱增,达到前所未有的规模。毋庸置疑,任何企业都希望自己迅速做强做大,并成为真正现代物流企业的典型代表,要实现这一目标一个首要问题就是要解决现代物流企业的发展观问题。