激光加工综合实训的探索与实践

激光加工技术属于先进制造技术,它的飞速发展使得其在制造业中的作用越来越重。本文介绍了在工程训练中引入激光加工技术的可行性和必要性,以激光内雕、激光雕刻、激光打标及综合实训项目为例,介绍了如何开展激光加工实训,分析现代工程实训教学模式的发展,重点探讨了如何在所设课程中既能提高学生兴趣、学生自主设计能力,又能强化工程能力培养,增强学生工程意识,得到较好实训教学效果。对实训教学改革具有一定的借鉴。     

数控加工课程教学改革的研究

实质上,数控加工的发展与技术应用,在很大程度上反映了一国的自动化水平。而"数控加工"作为一门以实践为核心、理论与实践相融合的专业课程,职业院校通过一体化的数控加工课程教学,实现了数控机床专业操作技术人员培养的目标。机械制造业的发展以及社会对数控加工技术人才的需求对数控专业教学与建设提出了全新的挑战。本文结合高职院校的现实教学情况,对数控加工课程教学改革展开了分析,并就高级数控人才的培养提出了思考与探索。     

激光加工机器人技术及工业应用研究

就激光加工机器人技术来讲,其是基于激光技术和机器人技术整合下衍生出来的。伴随着社会的不断进步以及科学的持续发展,激光加工机器人技术的研发工作成为目前多个国家致力研究的领域。将激光加工机器人技术应用到汽车制造当中,一方面可以释放更多的人力资源,另一方面也能促进汽车制造质量的充分提升。以整体角度为立足点而言,激光加工机器人技术具有重要的应用价值。     

机械制造工艺与精密加工技术研究

随着科学技术的飞速发展,我国机械制造业也在不断地加快改革步伐,向着"高、精、尖"方向发展。但受到技术和人才缺乏的影响,我国的机械制造业在发展过程中面临一定的阻碍和挑战,这就要求机械制造企业对当前的机械制造工艺与精密加工技术的联系、特点及在实际中的应用进行探究,不断研发新技术和培养高素质人才。文章分析了机械制造工艺及精密加工技术的特点,并展望了机械制造工艺和精密加工技术未来的发展方向。     

探索高职院《机械零件加工与装配实训》教学改革

机械零件手工加工作为一项传统加工技术,在高职院的教学现状不容乐观,为了培养更适应企业的技术人才,对该课程作了教学改革。文中详细介绍了改革的原因和具体方案。     

高职高专数控技术教学改革研究

随着科学技术的高速发展普通机械逐渐被高效率、高精度的数控机械所代替。因此,积极培养数控加工技术人才成为当午之急。本文分析了我国数控专业教育的现状和社会对数控人才的需求情况,提出了培养实用型数控技术人才为目标的数控教改需要解决的一些问题,并从理论和实践两个方面分析了培养实用型人才为目标的数控教改的意义。     

高等职业教育数控技术专业教学改革的几点意见

针对目前市场上加工制造业数控人才存在的问题，从数控专业教学改革方面，就高等职业技术教育应如何培养令用人单位满意的“应用型”数控技术人才提出几点意见。     

机械行业近期需要十种电子技术

“九五”期间机械行业需要下列电子技术：CAD应用技术、网络技术、建库技术、仿真技术。用于机械设计。计算机系统管理技术，自动化单元技术。用于企业管理与产品制造。自动化测试、电子分析技术、智能数字采集。用于机械产品在环保中的水、气分析。数控技术。用于车削和加工中心、磨床、锻压机械、电加工机床等设备的开发。高频调速技术。用于风机、泵、焊机。激光加工技术。用于机械产品中的激光焊接、三维激光切割、激光热处理等。自动化技术、电控技术。用于产业过程控制。电力电子技术、尤其是IGBT电力器件、电子半导体应用装置、大…     

超短脉冲激光对熔石英晶体烧蚀阈值的研究

研究脉宽分别为30fs,300fs,3000fs的激光作用到熔石英晶体上的烧蚀阈值,可以提高材料的加工精度,促进激光加工技术的实用化。结果表明:在超短脉冲时,烧蚀阈值可以精确确定,并且烧蚀阈值偏离与脉冲间隔平方根成正比的规律,烧蚀阈值与激光的脉冲宽度无关。文中结果与以前研究结果符合得较好。     

食品加工技术专业办学建议

当前,食品工业正朝着规模化、产业化、系列化、规范化的方向发展,从事食品加工和生产的专业技术人员,除了需要掌握相应的现代食品贮藏、加工、管理、营销等相关理论知识外更需要具备较强的实践技能和创新能力.行业的快速发展急需食品技术专业人才,食品专业技术人才的培养是当前急需解决的问题.     

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.