Search results

Selective jet electrodeposition (SJED) is an emerging additive manufacturing (AM) technology for realizing metallic components of nano and micro sizes. The deposited parts on the substrate form metallurgical bonding, so separating them from the substrate is an unsolved issue. Therefore, this paper aims to propose a method for separating the deposited micro parts from a sacrificial substrate. Furthermore, single and multi-bead optimization is performed to fabricate microparts with varying density.

A typical SJED process consists of a nozzle (to establish a column of electrolytes) retrofitted on a machine tool (to provide relative motion between substrate and nozzle) that deposits material atom-by-atom on a conductive substrate.

A comprehensive study of process parameters affecting the layer height, layer width and morphology of the deposited micro-parts has been provided. The uniformity in the deposited parts can be achieved with the help of low applied voltage and high scanning speed. Multi-bead analysis for the flat surface condition is experimentally performed, and the flat surface condition is achieved when the centre distance between two adjacent beads is kept at half of the width of a single bead.

Although several literatures have demonstrated that the SJED process can be used for the fabrication of parts; however, part fabrication through multi-bead optimization is limited. Moreover, the removal of the fabricated part from the substrate is the novelty of the current work.

Osteuropa — und hierbei wird dieser Raum als Gebiet der ehemaligen sozialistischen europäischen Staaten verstanden — ist besonders seit der politischen und ökonomischen Wende im Winter 1989/1990 in der DDR mit nachfolgender deutscher Wiedervereinigung — zum Schauplatz tiefgreifender Veränderungen geworden.

Presents over sixty abstracts summarising the 1999 Employment Research Unit annual conference held at the University of Cardiff. Explores the multiple impacts of globalization on work and employment in contemporary organizations. Covers the human resource management implications of organizational responses to globalization. Examines the theoretical, methodological, empirical and comparative issues pertaining to competitiveness and the management of human resources, the impact of organisational strategies and international production on the workplace, the organization of labour markets, human resource development, cultural change in organisations, trade union responses, and trans‐national corporations. Cites many case studies showing how globalization has brought a lot of opportunities together with much change both to the employee and the employer. Considers the threats to existing cultures, structures and systems.

Identifies three approaches to controlling the agent‐principal conflict for CEOs (market discipline, compensation structure and monitoring mechanisms) and reviews previous relevant research. Develops a mathematical model of the relationship between pay‐for‐performance sensitivity and external monitoring; and tests it on 1971‐1993 US data. Presents the results, which suggest that the sensitivity is significantly affected by monitors, growth opportunities and CEO share ownership. Considers consistency with other research and the implications of the findings.

The importance of comprehensive direct information and service in the services sector has increased con‐siderably in the past few years. Thanks not least to rapid developments in technology it is now possible to combine hardware and software in such a way as to develop application‐ and customer‐ specific products.

The paper emphasises the increasing importance and the role of destination benchmarking for the tourism industry. The first part of the paper critically discusses an existing benchmarking concept for destinations, namely “The Tourism Barometer” developed in the new German Federal States. In analysing the main weaknesses of this barometer approach an alternative way is shown towards a potential methodological re‐development of benchmarking exercises which can now include aspects of value generation for tourists and at the same time sharpen the analytical measurement of factors of production underlying the process of value creation in tourism. Thus, the proposed destination benchmarking model attempts to simultaneously integrate the related tourism supply and demand forces in the form of both, the destination specific resource use as well as the perceived customer value measured in terms of destination specific customer satisfaction. The proposed benchmarking system works with a battery of indicators which are being further employed in a data envelopment analysis (DEA). Based on empirical destination data from Austrian winter resorts a multivari‐ate DEA‐Model is presented, thus allowing an expost calculation of efficiency pattern in the creation of customer value. The concluding part of the paper explains the usefulness of data envelopment analysis for the field of destination management.

Russia is worldwide one of the most important growing incoming and outgoing markets. The country is actually still in a transition stage between central planned economy and market economy. Considerations on quality didn't play a major role in the socialist enterprise, therefore is a lack of quality in service culture in Russia. Altough the average Russian consumer is not used to a high level of service quality, the category of the “new rich” is a rather high demanding and critical tourist segment. In the near future, the importance of quality and quality management will increase in Russia.

Studies the characteristics, control and performance of joint ventures producing a model based on four cases. Explains the theory of complementary strategic objectives, and the need for delineating specific transaction costs and management controls under differing cultures. Interviews managers of four Sino‐American Joint Ventures in manufacturing for several years. Finds that the US partner controlled the technology, the Chinese partner wanted to reduce imports and import management and product skills. Focuses on raw material sourcing as a cause of conflict, as well as slow learning and high transaction costs from a poorly controlled system. Points out the keenness for incentive payments among Chinese workers and the reluctance by Chinese managers to have their performance evaluated.

L'Ecole internationale des sciences touristique de Rome est un organisme privé ayant pour but de promouvoir la connaissance culturelle à caractère multidisciplinaire du phénomène touristique par I'enseignement théorique des disciplines correspondantes. Ces disciplines seront intégrées par des travaux pratiques et par des éventuels stages professionnels.

This study aims to examine the effects of various physical and chemical pre-treatments on antioxidant properties of tree bean (Parkia roxburghii G. Don) in combination with storage conditions.

The whole pods and seeds of tree bean were treated with gamma rays (γ-rays), sodium hypochlorite (NaOCl), chlorine dioxide (ClO₂) and hydrogen peroxide (H₂O₂) and stored at room temperature (RT, 25°C) for 30 days. The physical and chemical pre-treated seeds and pods were compared with the same stored at RT and refrigerated storage at 4°C and −20°C. During storage, physical (moisture content) and antioxidants like total phenolics, ascorbate content, reduced glutathione, total flavonoids, along with free radical scavenging activities (FRSA) were measured.

Chemical pre-treatments with NaOCl, ClO₂ and H₂O₂ significantly accelerated (p = 0.05) the total phenolics (1.9 mg/g FW in seeds and 2.4 mg/g FW in pods), flavonoids content (0.3 mg/g FW each in seeds and pods) and ABTS activities (73.3 per cent in seeds and 92.3 per cent in pods) at 30 days of storage. A significant decrease (p = 0.05) in ascorbate content (6.1 mg/g FW in seeds and 3.5 mg/g FW in pods), reduced glutathione (5.1 mg/g FW in seeds and 3.7 mg/g FW in pods), FRAP (0.3 mg equi Fe/g FW in seeds and 0.4 mg equi Fe/g FW in pods) and reducing power (1.8 mg/g FW in seeds and 3.7 mg/g FW in pods) was observed under all the treatments at 30 days of storage. However, DPPH increased under γ-irradiation and decreased under chemical pre-treatments, storage at RT and refrigerated storage. The overall result showed that pre-treatment of H₂O₂ at 10-20 mM maintains antioxidants and radical scavenging activities in tree bean during storage.

The application of H₂O₂ at 10-20 mM prior to storage of tree bean maintains the physical, antioxidant properties and FRSA in tree bean seeds and pods as compared to natural ambient conditions. Hence, this technique will help in improving the keeping quality of this legume and avoid spoilage after harvest for an extended period.