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Article
Publication date: 31 July 2009

Valerio Giuliani, Ronald J. Hugo and Peihua Gu

The purpose of this paper is to provide a flexible tool to predict the particle temperature distribution for traditional laser applications and for the most recent diode laser…

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Abstract

Purpose

The purpose of this paper is to provide a flexible tool to predict the particle temperature distribution for traditional laser applications and for the most recent diode laser processes. In the past few years, surface processing and rapid prototyping applications have frequently implemented the use of powder delivery nozzles and high power fibre‐coupled diode lasers with highly convergent laser beams. Owing to the complexity and variety of the process parameters involved in this technology, mathematical models are necessary to understand and predict the deposition behaviour. Modeling the dynamics of the melting pool and the particle temperature distribution is critical for achieving a good deposition quality.

Design/methodology/approach

This study focuses on the development of mathematical models to predict the particle temperature distribution over the melting pool. An analytical and a numerical solution are proposed for two cases of laser intensity distribution: top hat and Gaussian.

Findings

The results show that a more vertical position of powder delivery nozzle will lead to a higher and more uniform particle temperature distribution, in particular for the top‐hat intensity distribution case.

Originality/value

Previous work has dealt only with Gaussian laser spatial distributions and collimated laser beams. Therefore, they were limited to a specific class of laser processes. This work provides a flexible tool to predict the particle temperature distribution for traditional laser applications (powder delivery nozzle and Gaussian laser profile) and for the most recent diode laser processes (powder delivery nozzle and top‐hat laser distribution with highly convergent laser beam). In addition, the results demonstrate that the particle temperature does not monotonically increase while increasing the nozzle inclination as in the case of a collimated laser beam, but some particles show a minimum temperature for intermediate values of the nozzle inclination angle.

Details

Rapid Prototyping Journal, vol. 15 no. 4
Type: Research Article
ISSN: 1355-2546

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Publication date: 19 August 2021

Vickie Coleman Gallagher, Lisa E. Baranik, Maria Hamdani, Sorin Valcea, Pakanat Kiratikosolrak and Anthony R. Wheeler

Multidimensional fit (MDF) has been coined as “elusive” and relevant to an individual’s social identity and self-concept, unfolding over time as individuals assess their fit…

Abstract

Multidimensional fit (MDF) has been coined as “elusive” and relevant to an individual’s social identity and self-concept, unfolding over time as individuals assess their fit relative to Person-Organization, Person-Vocation, Person-Job, and Person-Team Fit. In this chapter, the literature as it relates to the refugee employment journey, MDF, and HRM practices that facilitate or inhibit MDF is reviewed. Furthermore, in this study, the process-oriented view of the refuge path highlights the complexity of their experience, noting an array of antecedents as they relate to country, host country and individual differences, interventions through NGOs, refugee resettlement agencies, and organizations, as well as the less explored entrepreneurial path. These diverse paths and the process of finding fit, and the obstacles refugees face, are viewed through the lens of shocks and reassessment of MDF throughout their journey. Finally, the study’s outcomes illustrate individual wellbeing factors, organizational level benefits, as well as community level benefits to MDF.

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Article
Publication date: 1 March 1991

Allan Metz

Historically, Panama has always been “a place of transit.” While technically the isthmus formed part of Colombia in the nineteenth century, it was linked geopolitically to the…

276

Abstract

Historically, Panama has always been “a place of transit.” While technically the isthmus formed part of Colombia in the nineteenth century, it was linked geopolitically to the United States soon after the California gold rush, beginning in the late 1840s. The first attempt at building a canal ended in failure in 1893 when disease and poor management forced Ferdinand de Lesseps to abandon the project. The U.S. undertaking to build the canal could only begin after Panama declared itself free and broke away from Colombia in 1903, with the support of the United States.

Details

Reference Services Review, vol. 19 no. 3
Type: Research Article
ISSN: 0090-7324

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Article
Publication date: 1 April 1988

Paul Nieuwenhuysen

The following bibliography focuses mainly on programs which can run on IBM microcomputers and compatibles under the operating system PC DOS/MS DOS, and which can be used in online…

176

Abstract

The following bibliography focuses mainly on programs which can run on IBM microcomputers and compatibles under the operating system PC DOS/MS DOS, and which can be used in online information and documentation work. They fall into the following categories:

Details

The Electronic Library, vol. 6 no. 4
Type: Research Article
ISSN: 0264-0473

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Article
Publication date: 1 February 1974

Tom Schultheiss

The following classified, annotated list of titles is intended to provide reference librarians with a current checklist of new reference books, and is designed to supplement the…

227

Abstract

The following classified, annotated list of titles is intended to provide reference librarians with a current checklist of new reference books, and is designed to supplement the RSR review column, “Recent Reference Books,” by Frances Neel Cheney. “Reference Books in Print” includes all additional books received prior to the inclusion deadline established for this issue. Appearance in this column does not preclude a later review in RSR. Publishers are urged to send a copy of all new reference books directly to RSR as soon as published, for immediate listing in “Reference Books in Print.” Reference books with imprints older than two years will not be included (with the exception of current reprints or older books newly acquired for distribution by another publisher). The column shall also occasionally include library science or other library related publications of other than a reference character.

Details

Reference Services Review, vol. 2 no. 2
Type: Research Article
ISSN: 0090-7324

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Article
Publication date: 1 April 2004

Georgios I. Zekos

Investigates the differences in protocols between arbitral tribunals and courts, with particular emphasis on US, Greek and English law. Gives examples of each country and its way…

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Abstract

Investigates the differences in protocols between arbitral tribunals and courts, with particular emphasis on US, Greek and English law. Gives examples of each country and its way of using the law in specific circumstances, and shows the variations therein. Sums up that arbitration is much the better way to gok as it avoids delays and expenses, plus the vexation/frustration of normal litigation. Concludes that the US and Greek constitutions and common law tradition in England appear to allow involved parties to choose their own judge, who can thus be an arbitrator. Discusses e‐commerce and speculates on this for the future.

Details

Managerial Law, vol. 46 no. 2/3
Type: Research Article
ISSN: 0309-0558

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Book part
Publication date: 14 April 2016

Thomas M. Keck and Kevin J. McMahon

From one angle, abortion law appears to confirm the regime politics account of the Supreme Court; after all, the Reagan/Bush coalition succeeded in significantly curtailing the…

Abstract

From one angle, abortion law appears to confirm the regime politics account of the Supreme Court; after all, the Reagan/Bush coalition succeeded in significantly curtailing the constitutional protection of abortion rights. From another angle, however, it is puzzling that the Reagan/Bush Court repeatedly refused to overturn Roe v. Wade. We argue that time and again electoral considerations led Republican elites to back away from a forceful assertion of their agenda for constitutional change. As a result, the justices generally acted within the range of possibilities acceptable to the governing regime but still typically had multiple doctrinal options from which to choose.

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Studies in Law, Politics, and Society
Type: Book
ISBN: 978-1-78635-076-3

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Publication date: 12 September 2003

Ronald K Mitchell

Global entrepreneurship may be defined to be the creation of new, value-adding transactions or transaction streams anywhere on the globe. The objective of this chapter is to…

Abstract

Global entrepreneurship may be defined to be the creation of new, value-adding transactions or transaction streams anywhere on the globe. The objective of this chapter is to present and examine a theory of global entrepreneurship. At the World Economic Forum held in Davos, Switzerland, in January 1999, UN Secretary General Kofi Annan called for global entrepreneurship to meet the needs of the disadvantaged and the requirements of future generations. This chapter first presents a transaction cognition theory of global entrepreneurship that is intended as a path for research that responds to this call. Second, this chapter examines the theory from three critical viewpoints: (1) capability for explanation; (2) theoretical and operational utility; and (3) verifiability through the logic of scientific inference, and presents likely propositions that are surfaced by the analysis. Finally in this chapter, some of the likely implications of this theory within the context of globalization are discussed.

Details

Cognitive Approaches to Entrepreneurship Research
Type: Book
ISBN: 978-1-84950-236-8

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Book part
Publication date: 28 December 2016

Ken R. Blawatt

Free Access. Free Access

Abstract

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Marconomics
Type: Book
ISBN: 978-1-78635-565-2

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Article
Publication date: 1 October 2002

Steven J. Gold

Discusses the unequal allocation of social capital in society and makes the point that network membership is not at once available to all. Sees social capital as springing from…

315

Abstract

Discusses the unequal allocation of social capital in society and makes the point that network membership is not at once available to all. Sees social capital as springing from small groups that work together, perhaps competing with others, to achieve common rewards, thereby pursuing locally shared benefits. Concludes that specific definitions of social capital are superior to others especially in examining the full array of social ties which migrants use in creating ethnic economies and communities.

Details

International Journal of Sociology and Social Policy, vol. 22 no. 9/10
Type: Research Article
ISSN: 0144-333X

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