刮板输送机刮板链预紧力分析

刮板输送机在负载工作前需要对刮板链施加一定预紧力，以保证在负载条件下运行正常。预紧力是否合适对刮板链工作性能有直接影响。以双机驱动刮板输送机为例对刮板链预紧力进行分析计算，为合理选择预紧力提供一定参考。     

锚杆钻机2.5倍扭矩放大器的研究与分析

本文为适应巷道支护高强度预紧力的需要,提出了一种锚杆钻机扭矩放大器,简化了巷道支护高强度预紧力复杂的施工工艺,提高了巷道支护高强度预紧力施工的安全性,降低了巷道支护高强度预紧力施工的劳动强度。     

基于超张拉伸的高强度螺栓预紧力控制方法

预紧力衰减是高强度螺栓紧固时必然存在的问题,在螺栓采用拉伸法紧固时尤其突出,当衰减后的残余预紧力不能满足设计要求时,将威胁设备的运行安全。本文提出了超张拉伸补偿预紧力衰减的方法,通过理论假设和实际工况验证,对超张拉伸的参数选择、施工过程、适用范围做了初步探讨。     

动车组设备安装用螺栓扭矩计算及强度校核研究

为了确保在设备安装中能够更可靠,对动车组设备安装用的螺栓预紧,必须更要严格的将扭力要求提高上去。要确保螺纹在连接的过程中带动安全性能,从而大大的提高了动车组在安装设备中具有极大的可靠性,要想让发生事故的可能性减少,那就必须要对其进一步的研究和分析。在计算上和分析动车组设备安装的过程当中,要将螺栓螺纹联接的预紧方法和螺栓强度的核算问题以及对预紧力的控制等方面进行比较。因此,对螺栓连接强度的校核提供了有价值的理论依据。     

特大断面切眼受载变形特征与支护技术研究

为了解决特大断面切眼巷道支护难题,以曹家滩煤矿122106切眼为工程背景,结合理论分析与离散元数值模拟研究了不同顶板跨度条件下巷道受载变形特征,提出了"二次成巷+单体液压支柱+高强锚网索+W钢护板"的大断面煤巷高强度、高预紧力、低密度减跨支护技术,提高了支护效率,显著加快了巷道掘进速度。研究表明,当顶板跨度超过9m后其稳定性大幅下降,极易出现表层煤体破坏垮冒的现象;锚杆的承载性能与预紧力紧密相关,预紧力越大,越有利于锚杆发挥其承载性能;通过现场实测对研究成果进行了验证,巷道未出现明显变形,支护体受载始终稳定。     

关于对张大客专高速铁路接触网线索防风对策的探讨

高速铁路接触网是保证动车组运行的必要条件,架空的接触网极易受到外部环境的影响,季节性大风对接触网会造成风摆,影响线索的安全距离。本文通过阐述风对接触网的影响,从张大客专的实际情况出发,结合调查数据、设计文件进行论证分析,找出存在的问题,以及线索距离不足的关键,并制定出解决的对策,论证了接触网受风影响时我们需要特别注意的关键点,为以后的高铁建设提供一定的借鉴和参考。     

双螺母防松振动性能分析与研究

螺纹联接应用广泛,防松问题受到了人们的关注。本文通过对不同预紧力下的双螺母联接,在紧固件横向振动实验装置上进行了试验,总结出双螺母联接中不同预紧力下的防松效果与两个螺母之间预紧力的关系。     

偏磨套管的剩余抗挤能力研究

套管发生偏磨后,改变了原有的受力形式,将对其抗挤强度产生严重的影响。本文建立了偏磨套管分析的力学模型,应用曲杆理论导出了偏磨套管剩余抗挤能力的计算公式。通过与有限元数值计算结果对比表明,所得计算公式是可靠的。利用该公式可以快速而又准确地计算出偏磨套管的剩余抗挤强度,其具有较大的实用价值。同时研究了偏磨套管的剩余抗挤强度与套管相对磨损量的关系,结果表明,套管发生磨损后显著地降低了其抗挤强度。     

电气化铁路接触网可靠性及维修探析

电气化铁路接触网作为长年累月裸露在外的露天设备,其本身的零件与结构必定会受到自然条件变化的直接影响,再加上受电弓沿接触线高速摩擦滑行,就会让接触网处于摩擦、振动、电热等物理变化影响之中,导致接触网技术参数很容易发生变化。为了能够满足电力机车安全行驶的要求,就应该对接触网的可靠性进行分析,并且做好其相应的维修,这样才能确保电气化铁路接触网能够满足铁路运营的要求。因此,文章在分析电气化铁路接触网基本性征的前提下,通过对接触网系统维修计划的实际分析,希望可以通过可靠性和维修的探讨,为电子化铁路的发展奠定良好的基础条件。     

螺纹紧固力分析

本项目对发动机重要螺栓的装配工艺及螺栓紧固力的原理进行了较为全面的研究。通过对螺纹紧固件的紧固力分析,介绍了四种螺纹紧固件的装配方法和拧紧试验原理。同时对四种装配方法进行深入的讨论,利用试验结果论证不同装配方法产生的预紧效果与装配精度。     

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.     

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。     

浅谈大体积混凝土裂缝的控制

大体积混凝土的裂缝问题是实际工程中长期困扰工程技术人员的问题,其控制技术的研究是混凝土结构研究的热点问题,具有重大的学术价值和潜伏的工程背景。     

Supply Chain Strategies in the UK Fashion Industry—The Rhetoric of Partnership and Realities of Power

This paper focuses on the fashion industry, one characterised by issues such as dramatic shifts in the scale and power of major retail buyers in the market, the advent of retailer own brands, and the nature of sourcing and supply chain decisions, issues that are increasingly global in nature. The aim of this research is to explore the nature of relationships between UK high street multiple fashion retailers and their contracted suppliers, many of whom are entrepreneurial firms by most definitions of the term. Four core themes emerge from the literature and provide a framework for the research, namely, power, process, partnership, and people. The research approach was qualitative, and conducted over a period of twelve months. The paper ends with an agenda for future research.