薄煤层沿空留巷矿压观测显现规律研究

在沿空留巷实施过程中,为了观测两顺槽在本工作面留巷期间和二次采动影响期间的围岩活动规律,考察巷道围岩变形和充填体的变形,在沿空留巷过程中设置相应的测站,对围岩表面位移、围岩深部位移及围岩应力变化进行观测,以验证沿空留巷效果。     

预切顶无巷旁充填沿空留巷数值模拟分析

为了分析研究预切顶留巷技术应用效果,以某煤矿20916工作面为研究对象,采用PFC2D模拟软件模拟该工作面预切顶留巷工程实践,分析了留巷周边围岩的应力分布和裂隙发育规律。研究结果表明,采用预切顶无巷旁充填这种沿空留巷方式,使留巷围岩始终处于低应力区,从而沿空留巷上方基本顶稳定性,使覆岩压力向能够更深部煤体传递,有效防止顶板事故的发生。     

膏体充填优化系统预防堵管

矸石膏体充填开采,就是在建筑物下压煤条带开采后遗留的条带煤柱中,留设3～5m窄煤柱沿空送巷布置工作面,采用粉碎煤矸石、粉煤灰、专用胶结料和水配置成不泌水的牙膏状浆体,通过充填泵管道输送到井下,适时充填采空区或离层区,形成以膏体充填体为主的上覆岩层支撑体系,有效控制地表沉陷在建筑物允许值范围内,实现村庄不搬迂,安全开采建筑物下遗留条带煤柱。     

沿空留巷技术在煤矿开采中的应用

为有效缓解接替紧张、积极控制工作面上隅角瓦斯浓度,采取进风巷沿空留巷工艺,沿空留巷需经2次采动的影响,因此要求支护的方式和强度要合理。根据鹤煤集团中泰矿业的31021工作面煤层赋存条件与工作面的布置,结合沿空留巷速凝材料充填的技术特点,合理地制订了沿空留巷的支护参数和速凝材料的配比,采取充填泵给料充填,取得了良好效果。     

巷旁充填沿空留巷技术及矿压显现规律

本文就巷旁充填沿空留巷技术及矿压显现进行简要分析和阐述,从充填材料、系统布置、充填参数及工艺等方面进行研究,并对充填沿空留巷段进行矿压观测.结果证实:巷旁充填沿空留巷技术有效保证了顶板的稳定性和完整性,保障了充填体控制顶板的下沉、适应其活动规律的要求.     

泵送巷旁充填沿空留巷矿压显现规律研究

就泵送巷旁充填沿空留巷矿压显现规律进行深入的研究，其成果为新发煤矿沿空留巷巷道围岩控制提供理论依据和技术支持。     

沿空留巷支护的可靠性分析研究

沿空留巷技术是煤矿开采及回采巷道支护技术的一项重大改革，现针对沿空留巷围岩变形大、力学特性存在较大变异的特点，采用理论研究、运用工程结构可靠性理论、岩石力学和弹垫陛力学以及计算机技术等理论，围绕沿空留巷巷内锚杆支护、巷旁高水速凝材料充填支护方式的结构可靠性进行了比较系统的分析。     

邢东矿矸石充填工作面注浆技术的研究与应用

矸石充填工作面注浆技术的应用大大提高了工作面矸石充填体的抗压强度,弥补了矸石充填工作面上下巷充填及工作面过断层时充填不接顶、不密实的缺点,提高了工作面的充填率,改善了矸石充填工作面的充填效果。     

缓倾斜薄煤层下行风及矸沙填充沿空留巷集成技术研究

沿空留巷技术和Y型通风技术是近年来煤矿生产中应用的新技术,然而上述技术还存在成本越来越高,瓦斯治理困难的问题。本文在三汇一矿倾角20°采煤工作面中实施下行式Y型通风及沿空留巷技术,并用矸沙充填。结果表明该技术能明显降低瓦斯浓度,同时,既能保持巷道稳定而不需再次维修,又能明显降低漏风率和采煤工作面粉尘浓度,改善采煤工作面环境,降低成本,提高效率。     

柔模混凝土沿空留巷围岩活动规律与支护研究

随着锚杆支护技术及综采(放)技术的全面推广和应用,一方面锚杆支护在控制巷道围岩稳定的同时,却会使采空区漏风严重;另一方面工作面瓦斯涌出量急剧增大,给煤矿安全生产造成安全隐患。采用沿空留巷技术不仅可以发挥锚杆支护控制围岩稳定的优势,而且能够改变采空区的风流及瓦斯运移规律,大大提高了瓦斯难抽放、易自燃煤层工作面的单产水平。沿空留巷技术是煤矿安全开采技术的一项重大突破,具有巨大的社会经济效益与安全高效开采效益。     

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.