基于ANSYS模拟感应线圈产生涡流的研究

针对感应加热装置中线圈产生涡流的问题的研究。通过ANSYS软件对交变电流线圈进行分析,查看线圈在金属工件中产生的涡流分布。     

铝型材使用中防护性能的质量保证

关。如果其它参数都固定不变，则对Ic的影响仅决定于线圈到金属表面的距离。因而“涡流测厚仪”的测头装置产生的高频电磁场使置于测头下面的导体产生涡流，其振幅和相位是导体与测头之间的外导电覆盖层厚度的函数。GB 8013规定：“氧化膜的厚度用微米(μm)表示，它是一项重要参数，因此必须加以规定”。厚度分级标志为AA后加厚度级别数字，GB/T5237规定了厚度级别如下表：表中最小局部膜厚的意义是：在一段型材上取均匀分布的若干作为测量点，每点测量若干次取平均值，平均值中最小的那个就是最小局部膜厚。各点的平均值再取平均值就是…     

脉冲涡流热成像缺陷检测技术优化研究现状

脉冲涡流热成像缺陷检测技术是一种重要的无损检测手段,其在复杂形状的缺陷检测中具有优势而备受关注。对脉冲涡流热成像检测优化目的在于寻找合适的激励手段,提高缺陷的检测能力。对脉冲涡流热成像检测技术进行优化的手段主要三种,在结合工程应用实际的基础上,介绍了目前国内外三种检测优化手段的研究进展。为了提高缺陷检测的能力,需要对激励线圈和参数进行优化设计。     

膛口动态感应装定通讯链路实时测试方法

膛口动态感应装定通讯链路可靠性的实时测试方法是在膛口装定信号发射线圈外增加了一级测试线圈,用于实时接收与弹上感应线圈相同的装定信号;在炮口外设置了由两级激光发射与接收装置组成的启动装置,可以有效地防止误识别与误触发。仿真和实验表明,本测试方法可有效解决膛口动态感应装定测试时机确立的问题,达到对膛口动态感应装定信号实时测试的目的。     

导电涂层厚度脉冲涡流检测方法研究

为更准确地检测导电涂层厚度，本研究深入探讨了脉冲涡流检测方法。基于导电涂层主要性质和涡流检测的基本理论，建立了一个高效脉冲涡流检测模型，并设计了相应的检测系统。通过实验，该方法显示出较高的检测精度，并成功地与传统检测方法进行了比较。结果表明，脉冲涡流技术在检测精度和效率方面均优于传统方法，总体而言本研究证明了脉冲涡流检测方法在导电涂层厚度检测中的应用潜力和优势。     

开关电源中线圈的邻近效应研究

在开关电源电磁元件中一般不可能没有线圈。线圈中的可变磁场感应产生了涡流,从而导致了集肤效应和邻近效应。文章分析邻近效应产生的基本原理,并对其进行了定量分析。通过分析提出,临近效应产生的大小随着线圈层数的增加而按指数规律递增。最后分析了邻近效应和如直流阻抗比的关系。     

开关电源中线圈的邻近效应研究

在开关电源电磁元件中一般不可能没有线圈。线圈中的可变磁场感应产生了涡流,从而导致了集肤效应和邻近效应。文章分析邻近效应产生的基本原理,并对其进行了定量分析。通过分析提出,临近效应产生的大小随着线圈层数的增加而按指数规律递增。最后分析了邻近效应和交/直流阻抗比的关系。     

某托卡马克装置的环向场线圈电磁场初步分析

为进一步提高HL-2A装置的放电参数和优化等离子体位形,需要对HL-2A装置进行检验,环向场线圈是该装置的重要元件。环向场线圈电磁场分析方法是进行设计的重要基础。文章运用有限元的方法,对HL-2A的环向场线圈进行了电磁场初步分析,通过不同的分析模型的比较,得到较高安全裕度的分析模型。     

井下涡流排液采气理论与应用研究

井下涡流排液采气工艺可以有效提高气井携液能力,已在国内外多个气田进行了成功应用,该工艺能够适应雅克拉、大涝坝、轮台深层凝析气田的排采要求。因此,对涡流工具的排液原理进行分析,对涡流场中液滴的受力情况和涡流场的能量利用情况进行分析,并选取积液气井开展试验研究。通过理论分析可知,涡流场改善了液滴的受力情况,可以更加有效利用能量。现场试验表明,涡流工具可以有效排除井筒积液,并有效减缓井口压力与产量递减,具有良好的推广应用前景。     

涡流探伤应用于列管设备检测的分析研究

主要介绍了涡流探伤的检测原理,与方法及涡流探伤在列管设备检测中的分析研究,着重的处理与分析检测中出现的重大缺憾的列管设备,在射线探伤与表面探伤,的基础上实现了多种方式的复验,而且对出现损伤的原因进行深度的解剖,让涡流探伤的检测手法有了更具有说服力的检验手法,为今后的检测道路上提供一个可以借鉴的方式.     

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.