煤矿3煤层底板水害预测研究

我国是受水害较严重的国家之一,很多煤矿在安全生产过程中,煤层底板突水是比较常见的问题,煤矿A就面临着底板突水的采煤安全问题。本文结合煤矿A地质环境,详细介绍了矿井主要水害及突水实例,再运用突水系数法对某煤矿进行突水危险性预测。研究结果对防治煤层底板突水和实现煤矿安全生产具有重要的理论意义和实际意义。     

基于GIS的矿体底板突水脆弱性评价

矿体底板突水原因众多,传统的突水系数法所能考虑的突水影响因素很有限,不能全面的描述矿体底板突水带的复杂机理。现以底板突水脆弱性理论为基础,对底板突水危险性进行评价。目的在与对该理论的深入理解,为矿井安全生产服务。     

煤层顶底板突水流固耦合数值模拟研究进展

突水作为煤矿常见的主要灾害之一,对矿井的危害极大,一旦发生突水,会严重威胁人身财产安全.目前对煤矿突水的研究主要集中在采用FLAC3D与COMSOL Multiphysics软件对煤层顶底板突水进行数值模拟,其基本原理都是建立流固耦合数学模型.FLAC3D数值模拟软件通常采用充填法、留煤柱法与注浆加固法治理突水;COMSOL Multiphysics数值模拟软件通常采用注浆加固法治理突水.选取合适的软件建立流固耦合数学模型模拟突水事故发生的过程,研究采动对隔水层渗流的影响,为有相似情况的煤矿安全生产提供理论依据,对治理有突水隐患煤矿的安全生产有重大的意义.     

煤矿立井堵水案例

煤矿在掘进混合立罐窝至煤层底板下12．5m时出现突永，使掘进工作不能正常进行。文章采用改造底板及特殊工艺分步成功地将动态底板突水转换成静态可控流水直至最后治理不影响正常生产。     

水化学分析法判别煤矿突水水源

邢东煤矿底板钻孔发生突水,及时准确判别出水水源,成为了治理矿井突水的关键。本文对矿井主要含水层进行水化学特征分析后,绘制出水样的Pi Per三线图,并通过出水点与背景值进行对比,从而判断出出水水源为奥灰岩溶水,为封堵井下突水奠定了基础。     

瞬变电磁法在杨涧煤矿水害防治中的应用

近年来煤矿突水事故成为了煤矿重大安全事故的主要类型之一,因此,探明开采区域内的水文地质构造是保证安全生产的重要前提。而随着近年来物探技术的飞速发展,其在煤矿水害防治中的应用的也逐渐成熟。本次勘探,结合杨涧煤矿的实际情况,利用瞬变电磁法反应灵敏,探测效率高的特点,基本查明了我矿90101工作面9号煤层含(导)水构造,圈定了导水构造区域,为我矿安全高效开采提供了有力保障。     

豫西陕县矿区灰岩断层突水研究

针对豫西陕县煤矿发生的断层突水问题,通过对井田断层发育规律及断层突水机理进行分析研究,总结出该矿区断层突水的规律,并根据研究结果提出矿区断层突水防治措施,对于矿井安全生产具有一定的指导意义。     

董家河煤矿立井穿越含水层技术探讨

董家河煤矿属于受奥灰水严重威胁并具有突水危险的矿井,水文地质类型属水文地质条件极复杂型矿井,煤系基底奥陶系灰岩,对上部煤层的开采威胁极大,是矿井生产的主要安全隐患.通过对煤矿立井穿越含水层进行技术改造,煤炭开采条件得到了改善,为煤矿节约了资金.     

董家河煤矿立井穿越含水层技术探讨

董家河煤矿属于受奥灰水严重威胁并具有突水危险的矿井,水文地质类型属水文地质条件极复杂型矿井,煤系基底奥陶系灰岩,对上部煤层的开采威胁极大,是矿井生产的主要安全隐患。通过对煤矿立井穿越含水层进行技术改造,煤炭开采条件得到了改善,为煤矿节约了资金。     

福建龙岩罗厝山煤矿突水机理分析

龙岩罗厝山煤矿+435m水平平硐39煤层南运输巷迎头灰岩1999年发生了数次水量不等的突水事件,文章科学分析灰岩突水现象,结合有关资料,借助设置突水水文地质模型,尝试解释突水机理,为今后有针对性地制定井下防治水方案提供理论参考依据。     

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.     

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.     

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 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.