基于有限元方法的构架夹紧力反弹变形研究

本文对构架工装夹紧力对构架变形的影响趋势通过有限元工具进行分析,以便分析夹紧力对构架加工反弹变形的影响趋势,对工装的改进提供建设性意见。     

柔性三维组合焊接工装发展应用

三维柔性组合焊接工装夹具可通过三维空间任意组合，任意定位。产品具有经济性；柔性化；精确性；重复性；模块化；耐用性的特点。经过几十年的发展，该系统已经成为钢结构、基础件以及一切焊接件加工中不可或缺的工具，用于定位和夹紧。     

齿轮内孔磨夹具设计研究

齿轮热处理后的磨内孔是齿轮加工常遇到的工艺问题,制作一个好而实用的夹具对于提高产品质量和效率,降低成本,显得尤为重要,采用增力机构可提高夹紧力并使结构紧凑、使夹紧更可靠,具有较高的经济性。     

铣削两平行球面的专用夹具制作探讨

文章通过对圆锥体工件加工工艺的加工特点的研究,针对V形块夹紧或三爪卡盘夹紧装置的不足,设计出一套多工位圆锥体球面铣削专用夹具,并对圆锥体球面利用该夹具安装以及采用数控铣床进行编程铣削加工的加工工艺、编程方法等进行分析。该夹具在实际应用中既保证了产品的加工精度,又提高了生产效率。     

机床专用夹具分析研究

本文基于专用夹具的设计和加工要求,举例分析其各部件尺寸、加工定位方案以及夹紧力计算过程,旨在提高产品质量和生产效率。     

六方头类零件钻具的研究

本新型万能通用夹具是适应多规格螺栓头部钻单孔所用,是利用通用化、万能化夹具而减少专用工装的派制,以节省工时、降低加工费用和提高加工效率为目标。本项目通过设计一套夹具,将钻套安装到可滑行钻模板上,V形块既是定位元件又是夹紧元件,同时配活动定位板,具有灵活可调突出显著特点,适应多尺寸定位的需求。同时可以加工六角头S7～S12mm的螺栓零件。     

液压弹簧式夹轨器弹簧的设计计算

防风夹轨器是露天工作起重机的重要防风装置,本文介绍的自动防风夹轨器是利用液压与弹簧产生夹紧力,具有安全、可靠、自重轻等特点.文中介绍了该夹轨器的基本原理及弹簧的设计计算.     

基于SolidWorks仿真的同步机偏心磁极压板车胎设计

文章根据增安型同步电动机磁极压板的结构特点和工艺性,介绍了磁极压板偏心车胎的设计过程。并基于SolidWorks三维仿真设计软件,分析改进了车胎的结构,增加减重孔使整个夹紧装置系统重心（带工件）与工装回转中心线同心,有效地保证了偏心磁极压板的加工质量。     

薄壁零件的车削

薄壁零件的刚性差,切削加工中夹紧力难以控制,切削热增加而影响加工质量,针对这种情况,优化切削工艺,切削参数,可以减少薄壁零件车削中的变形,从而保证了加工精度。     

组合式机架C型板与十字键接触状态研究

对组合板框式巨型模锻压机主机架的关键件C型板进行理论的受力分析,得到了工作载荷P与夹紧拉杆预紧力F(O)之间的关系.通过非线性有限元软件MARC建立了大型模锻压机C型板结构的三维有限元模型,将理论推导出来的夹紧拉杆预紧力应用到有限元模型中去,以理论解为依据,在理论解周围取一系列数值进行分析对比,得出夹紧拉杆预紧力F(O)的大小直接影响到C型板与十字键的接触状态的好坏.对压机的设计具有重要的参考价值和现实意义.     

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.     

Multinomial distributions applied to random sampling of particulate materials

When sampling a batch consisting of particulate material, the distribution of a sample estimator can be characterized using knowledge about the sample drawing process. With Bernoulli sampling, the number of particles in the sample is binomially distributed. Because this is rarely realized in practice, we propose a sampling design in which the possible samples have a nearly equal mass. Expected values and variances of the sample estimator are calculated. It is shown that the sample estimator becomes identical to the Horvitz–Thompson estimator in the case of a large batch-to-sample mass ratio and a large sample mass. Simulations and experiments were performed to test the theory. Simulations confirm that the round-off error due to the discrete nature of particles is negligible for large sample sizes. Sampling experiments were carried out with a mixture of PolyPropylene (PP) and PolyTetraFluorEthylene (PTFE) spheres suspended in a viscous medium. The measured and theoretical variations are in good agreement.     

Performance appraisal and culture: practice and attitudes in Hong Kong and Great Britain

This article compares the practice of and attitudes towards performance appraisal for managerial and professional staff in Hong Kong and Britain, and considers the extent to which actual practice and employee preferences are in alignment. Findings suggest that appraisal may be more widespread in Hong Kong than in Britain. However, British appraisal tends to be more participative and to place greater emphasis on discussing objectives, development and career plans. Hong Kong appraisals appear to be more directive and Hong Kong respondents perceive a higher level of 'negative' appraiser behaviour. In spite of this, Hong Kong respondents show if anything slightly more confidence in the utility of appraisal than do British respondents. They show stronger support for appraisal's use for reward and punishment and less support for the objectives-setting and training and development uses than do the British sample. Hong Kong respondents are more likely than their British counterparts to favour involving a more senior manager in appraisal, and they are less likely to prefer more frequent appraisals. There was little evidence that Hong Kong respondents had a stronger preference for group-based appraisal criteria, although they did show more support than the British sample for the use of personality as a basis for appraisal. Overall, the suggestion is that appraisal has been adopted in Hong Kong organizations but that the practice of appraisal has been adapted to suit the cultural characteristics of the society.     

Narrative construction of expatriate experience and career cycle: discursive patterns in Finnish stories of international

Expatriate experience is not only a disconnected occasion for cross-cultural anxiety and adjustment but also an important event in the process of self-development and learning. Following this view and arguing for a discursive approach, the paper focuses on ways in which expatriates themselves tell and interpret their development and movement across expatriate career cycle. Meaning systems connecting expatriate job with previous and following work experiences in career stories of Finnish engineers and managers were identified using a combination of narrative and discourse analysis. No evidence was found of an autonomous expatriate discourse but, in contrast, expatriate career cycle was narrated using available organizational repertoires of development and career. Describing and discussing the meaning-making properties of three identified discourses - bureaucratic, occupational and enterprising - the paper emphasizes the organizational environment of expatriate experience while acknowledging the limits of these contemporary career vocabularies in addressing individual learning and change in cross-cultural settings.     

Internet professionals: job skills for an on-line age

The paper explores the increasing popularity of the Internet technology Singapore. It argues that the diffusion of Internet technology to South-East Asia would create new duties and responsibilities for human resource (HR) managers. One such duty is the identification of the skills which professional Internet staff would need to perform their work effectively in organizations. Using a triangulation research method, empirical study has identified the new professional Internet jobs which have emerged the IT industry in Singapore and the skills that professional Internet personnel require do their jobs effectively. Analysis of the findings indicates that professional Internet skills involve both technical and creative abilities and that, in explaining or defining professional Internet skills, it is necessary to use both the technical and the social conceptions of skill. This argument is based on the view that the creative skills include tacit skills so that a definition based solely on the technical conception of skill cannot capture the various dimensions of Internet skills. The implications of the research findings for human resource managers are raised.     

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.     

关于高校教学秘书工作的认识与思考

教学秘书在教学管理中起着举足轻重的作用,本文结合自己近6年从事教学秘书的工作实践和体会,阐述了高校教学秘书的工作职能和工作内容,提出了教学秘书应具备的素质,分析了日前教学秘书工作中存在的问题,探讨了教学秘书工作改进的方法与途径。     

Sister Communities: Rejecting Labels of Informality and Peripherality in Vanuatu

Some labels have dire consequences. This article takes issue with the labels commonly used to describe the physical and social location of communities living on the edge of Port Vila, Vanuatu—labels that position communities for eviction by entrenching tropes of informality and peripherality into how they are seen and represented. Such terms include informal, settlement, informal settlement, squatter and peri-urban. Based on interviews with around 100 people and two years of ethnographic engagement with urban communities in Port Vila, Vanuatu, I critique the language of policy against the lived experience of those at the urban edge. I use Bourdieu's articulation of power as an accumulation of symbolic capital that enables one to speak the world into being. I conclude that the language of policies and plans is reflective of a dominant discourse in urban studies and international aid, and non-reflective of the experience and identities of people living at the urban edge. My interviewees and interlocutors maintain their identities as sister communities—as places grounded in the formality of customary tenure, and as part of the city rather than outside it.