谈矿井建设初期两井贯通测量的问题

在两条巷道对头掘进贯通时,有很多问题需要注意,特别是在互不通视的两个工作面进行工作,测量和施工都很复杂,如果操作不当极易发生事故,造成严重的后果。因此在两井贯通时,必须做好测量。测量的准确性,这是成功爆破的基础。应该有准确的测量图,并且表明施工进度。在施工过程中,及时为爆破人员提供数据信息,然后施工人员可以准确布置炮眼,保证爆破的准确性。测量开始之前要向工程的设计部门了解有关工程的设计方案,和施工部门是施工方案,了解两井贯通时可能相遇的交点,确保数据信息的准确。     

矿山贯通测量精度的探讨

贯通测量是矿山测量工作的一项重要工作。贯通工程质量的好坏,直接关系到整个矿井的建设、生产和经济效益。为了加快矿井的建设速度、缩短建井周期、保证正常的生产接替和提高矿井产量,经常采用多井口掘进或多头掘进,这样就会出现两井间或井田内的巷道贯通测量。     

复杂条件下两井贯通测量技术研究与应用

为保证两井之间巷道的正确贯通,两井的测量数据必须统一,即采用同一坐标系统和高程系统,为此,需在井上进行地面控制测量,使两个井筒置于同一控制网中;为了使井上、下使用同一坐标系统,需要进行矿井联系测量把地面的坐标系统和高程系统传递到井下;然后利用井下导线测量把井下起始方位和坐标延伸到相向掘进的两个头面。     

点上对中在矿井风速较大巷道的精确测量

为确保祁东矿-408m第二总回风巷至南风井的精确贯通,在井下二采区的西翼总回风巷和-408m第二总回风巷各布设一条基本控制测量导线(15″级)并对其进行科学合理的精确测量和精度分析。在井下风速大的巷道里科学的布设测量点,利用全站仪激光对点器,采取点上对中、三脚架上摆设对中基座仪和测量专用挡风工具相结合新方法观测。巧妙地解决了因巷道风速大,无法正常观测导线的难题。满足了导线测量的精度,从而更好更精确地给定巷道中腰线,指导掘进生产。对今后因巷道风大条件下的精确测量起到很好的示范作用。     

浅谈巷道掘进的通风方式选用与通风设备系列化

“采”和“掘”是煤炭生产过程中的两大工程。在高瓦斯煤矿中，与工作面采煤作业一样，掘进巷道时也存在煤与瓦斯突出危险。随着开采深度的增加，突出危险徒然增长。但采矿工程离不开井巷掘进，也暂时不能实现完全自动化作业，需要人工参与掘进，总的来说，巷道掘进存在风险。为了保证掘进安全，首要是加强掘进工作的通风管理和合理选用配套的通风设备，文中笔者结合实践经验探讨了巷道掘进的通风方式选择，以及如何实现掘进面通风设备系列化，能为具有相似地质条件的高瓦斯矿井在巷道掘进时提供参考。     

坚硬顶板条件下巷道支护设计

在井下作业的煤矿开采存在着许多的安全隐患,尤其是在巷道掘进方面。在井下掘进作业的煤矿开采活动经常会出现漏水和瓦斯爆炸等安全事故,在出现这些事故以后,在井下作业的工人唯一逃生的通道就是井下巷道,而井下巷道的支护结构设计即加固形式的设计是保证巷道畅通的重要条件。文章主要就巷道支护设计的工程测量和观察两个方面进行分析。     

煤矿巷道掘进技术现状及未来发展趋势

由于我国的煤层赋存条件复杂，所以我国的煤炭开采主要以井下开采为主。为了能够保证煤炭开采的数量和质量，需要开掘大量的煤岩巷道。目前，我国在煤矿巷道掘进技术和装备方面有了较大的进步，有些方面甚至迟到了世界先进水平。本文从我国煤炭巷道掘进技术的现状入手，来分析一下＇我国煤炭巷道掘进技术的发展水平及未来的发展趋势。     

深部巷道围岩稳定性远程实时自动监测系统应用

本文介绍了巷道掘进过程中顶板离层及压力在线实时监测,有效控制巷道顶板变化,克服人为因素的不确定性,保证掘进安全。     

快速掘进技术在矿井综掘中的实践

地质条件复杂的矿井,存在着施工速度低、采掘关系日益紧张等现象,影响煤矿生产的发展和安全状况,因此在原来的基础上提出了巷道快速掘进技术。文章结合具体的矿井实例,介绍了快速掘进施工工艺和支护工艺,并阐述了如何在掘进施工中实现巷道的快速掘进。     

煤矿软岩支护技术的发展探讨

正伴随着煤矿企业对资源开采强度的不断加大、开采深度的不断延伸,煤矿开采区域所处的地质条件更加复杂和多变,由此而讲,地质条件会对煤矿开采条件产生较大的影响,煤矿巷道掘进是一项必不可缺的系统工程,掘进巷道的工程质量关系着其服务年限的长短和服务效果的好与不好,在掘进过程中要求对整个工作面进行良好的支护,而掘进巷道的质量主要体现在对围岩的控制程度和支护的合理可靠性。一、软岩支护存在的问题1、软岩巷道的特点     

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.     

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.     

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.     

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.     

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.     

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.     

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.     

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.