小车床尾座镗孔专用夹具设计

近年来,机械行业竞争越来越激烈,许多企业对生产效率和产品质量都提出了较高的要求。市场竞争要求产品既要质量好,又要成本低。使用工装夹具可以实现工件的快速装夹,减少辅助加工时间,降低加工成本。本文设计了一套小车床尾座加工的专用夹具,其特点是结构紧凑,操作迅速、方便、省力,可以保证较高的加工精度和生产效率。     

加工中心多个零件夹具设计

本文通过分析零件的特点及其技术要求,并根据此零件的特点;在保持其精度的前提下,为了提高生产效率,设计一次可以加工6个零件的加工中心夹具。分别介绍了零件的工艺、夹具设计分析、夹具的结构及工作原理。     

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。     

提高连接板加工质量和效率的方法

连接板是瓦楞纸箱机生产线上的一个零件,由于加工工艺设计不合理,加上夹具、刀具不能适应加工要求,导致产品合格率不高,严重影响生产。经过努力,改革夹具和工艺,提高产品质量和效率,满足了生产需要。     

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。     

提升轮体加工工艺的设计

提升轮体是立式洗瓶机上的一个较复杂的零件,由不锈钢铸造再经车铣加工而成,轮体上有15条T字型滑道,其尺寸精度、表面粗糙度和对称度都有较高要求,由于不锈钢材料加工性能不好且铣削加工后期被挖去的材料大部分使工件刚性变得很差,产生较大的变形,致使加工十分困难。文章介绍了从控制工件加工变形的角度设计了加工的铣削夹具和一套完整的加工工艺,经实际运用满足了零件设计精度要求,提高了效率并确保了产品的质量。     

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。     

浅析数控铣床加工特殊零件的夹具

在进行特殊零件专用夹具的设计时,为了提高加工精度,要注意定位基准的合理选择;若对加工效率有要求,可以考虑设计为一次装夹多个零件的专用夹具。另外,还要注意选择合适的夹具材料和夹紧力,以保证不对零件表面造成损伤。     

扁体十字孔零件专用夹具设计

本文通过对扁体十字孔零件图分析,在大批量生产时,设计专用夹具在CK6136S型数控车床上进行加工,不仅扩大了数控车床的加工范围,保证了形位公差的要求,而且降低了对操作者的技术要求,大大提升了生产效率。     

螺旋定心夹紧夹具的设计

本文介绍了螺旋定心夹紧夹具的设计方法和操作方法,此夹具能够准确、迅速的装夹摇臂零件,完成摇臂的28.5mm±0.1mm槽加工,同时提高了生产效率,缩短了加工时间,降低劳动强度,花费的成本少。     

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.