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Article
Publication date: 28 January 2020

David Downing, Martin Leary, Matthew McMillan, Ahmad Alghamdi and Milan Brandt

Metal additive manufacturing is an inherently thermal process, with intense localised heating and for sparse lattice structures, often rapid uneven cooling. Thermal effects…

Abstract

Purpose

Metal additive manufacturing is an inherently thermal process, with intense localised heating and for sparse lattice structures, often rapid uneven cooling. Thermal effects influence manufactured geometry through residual stresses and may also result in non-isotropic material properties. This paper aims to increase understanding of the evolution of the temperature field during fabrication of lattice structures through numerical simulation.

Design/methodology/approach

This paper uses a reduced order numerical analysis based on “best-practice” compromise found in literature to explore design permutations for lattice structures and provide first-order insight into the effect of these design variables on the temperature field.

Findings

Instantaneous and peak temperatures are examined to discover trends at select lattice locations. Insights include the presence of vertical struts reduces overall lattice temperatures by providing additional heat transfer paths; at a given layer, the lower surface of an inclined strut experiences higher temperatures than the upper surface throughout the fabrication of the lattice; during fabrication of the lower layers of the lattice, isolated regions of material can experience significantly higher temperatures than adjacent regions.

Research limitations/implications

Due to the simplifying assumptions and multi-layer material additions, the findings are qualitative in nature. Future research should incorporate additional heat transfer mechanisms.

Practical implications

These findings point towards thermal differences within the lattice which may manifest as dimensional differences and microstructural changes in the built part.

Originality/value

The paper provides qualitative insights into the effect of local geometry and topology upon the evolution of temperature within lattice structures fabricated in metal additive manufacturing.

Details

Rapid Prototyping Journal, vol. 26 no. 5
Type: Research Article
ISSN: 1355-2546

Keywords

Content available
Book part
Publication date: 20 June 2017

David Shinar

Abstract

Details

Traffic Safety and Human Behavior
Type: Book
ISBN: 978-1-78635-222-4

Book part
Publication date: 5 October 2007

David Shinar

Abstract

Details

Traffic Safety and Human Behavior
Type: Book
ISBN: 978-0-08-045029-2

Article
Publication date: 8 July 2014

Hui Lin and Brendan Luyt

– The purpose of this paper is to investigate the role of the National Library of Singapore in the life of Singaporeans.

1416

Abstract

Purpose

The purpose of this paper is to investigate the role of the National Library of Singapore in the life of Singaporeans.

Design/methodology/approach

The paper uses historical research. McMillan and Chavis’ theory of sense of community is adopted as the analytical framework to delineate the role of the National Library of Singapore.

Findings

The paper finds that the National Library of Singapore plays an important role in fostering a sense of community among Singaporeans. The transformation of the library to a truly public institution in 1950s effectively enlarged its boundaries. Upon joining the community of the library, local Singaporeans underwent a bidirectional process of influencing and being influenced. The library made strenuous efforts to meet the needs of Singaporeans in myriad ways, resulting in reinforcement of the sense of community among Singaporeans. A shared emotional connection in the community was engendered as a result of the frequent contact and high-quality interaction.

Originality/value

While being influenced by various social and cultural frameworks under which it operates, the library actively takes part in and influences the society. The study of the library in the life of the users via the lens of sense of community provides a perspective to further understand the potential and power of libraries and how libraries can positively contribute to the society at large.

Details

Journal of Documentation, vol. 70 no. 4
Type: Research Article
ISSN: 0022-0418

Keywords

Article
Publication date: 1 March 1999

Allan Metz

President Bill Clinton has had many opponents and enemies, most of whom come from the political right wing. Clinton supporters contend that these opponents, throughout the Clinton…

Abstract

President Bill Clinton has had many opponents and enemies, most of whom come from the political right wing. Clinton supporters contend that these opponents, throughout the Clinton presidency, systematically have sought to undermine this president with the goal of bringing down his presidency and running him out of office; and that they have sought non‐electoral means to remove him from office, including Travelgate, the death of Deputy White House Counsel Vincent Foster, the Filegate controversy, and the Monica Lewinsky matter. This bibliography identifies these and other means by presenting citations about these individuals and organizations that have opposed Clinton. The bibliography is divided into five sections: General; “The conspiracy stream of conspiracy commerce”, a White House‐produced “report” presenting its view of a right‐wing conspiracy against the Clinton presidency; Funding; Conservative organizations; and Publishing/media. Many of the annotations note the links among these key players.

Details

Reference Services Review, vol. 27 no. 1
Type: Research Article
ISSN: 0090-7324

Keywords

Book part
Publication date: 16 December 2017

Masazumi Wakatabe

This chapter investigates the nature of the transformation of macroeconomics by focusing on the impact of the Great Depression on economic doctrines. There is no doubt that the…

Abstract

This chapter investigates the nature of the transformation of macroeconomics by focusing on the impact of the Great Depression on economic doctrines. There is no doubt that the Great Depression exerted an enormous influence on economic thought, but the exact nature of its impact should be examined more carefully. In this chapter, I examine the transformation from a perspective which emphasizes the interaction between economic ideas and economic events, and the interaction between theory and policy rather than the development of economic theory. More specifically, I examine the evolution of what became known as macroeconomics after the Depression in terms of an ongoing debate among the “stabilizers” and their critics. I further suggest using four perspectives, or schools of thought, as measures to locate the evolution and transformation; the gold standard mentality, liquidationism, the Treasury view, and the real-bills doctrine. By highlighting these four economic ideas, I argue that what happened during the Great Depression was the retreat of the gold standard mentality, the complete demise of liquidationism and the Treasury view, and the strange survival of the real-bills doctrine. Each of those transformations happened not in response to internal debates in the discipline, but in response to government policies and real-world events.

Details

Including a Symposium on New Directions in Sraffa Scholarship
Type: Book
ISBN: 978-1-78714-539-9

Keywords

Content available
Book part
Publication date: 15 January 2021

Ana Cecilia Dinerstein and Frederick Harry Pitts

Abstract

Details

A World Beyond Work?
Type: Book
ISBN: 978-1-78769-143-8

Book part
Publication date: 19 November 2003

Abstract

Details

Handbook of Transport and the Environment
Type: Book
ISBN: 978-0-080-44103-0

Book part
Publication date: 14 May 2003

Jonathan L Gifford

Abstract

Details

Flexible Urban Transportation
Type: Book
ISBN: 978-0-08-050656-2

Book part
Publication date: 27 October 2016

Alexandra L. Ferrentino, Meghan L. Maliga, Richard A. Bernardi and Susan M. Bosco

This research provides accounting-ethics authors and administrators with a benchmark for accounting-ethics research. While Bernardi and Bean (2010) considered publications in…

Abstract

This research provides accounting-ethics authors and administrators with a benchmark for accounting-ethics research. While Bernardi and Bean (2010) considered publications in business-ethics and accounting’s top-40 journals this study considers research in eight accounting-ethics and public-interest journals, as well as, 34 business-ethics journals. We analyzed the contents of our 42 journals for the 25-year period between 1991 through 2015. This research documents the continued growth (Bernardi & Bean, 2007) of accounting-ethics research in both accounting-ethics and business-ethics journals. We provide data on the top-10 ethics authors in each doctoral year group, the top-50 ethics authors over the most recent 10, 20, and 25 years, and a distribution among ethics scholars for these periods. For the 25-year timeframe, our data indicate that only 665 (274) of the 5,125 accounting PhDs/DBAs (13.0% and 5.4% respectively) in Canada and the United States had authored or co-authored one (more than one) ethics article.

Details

Research on Professional Responsibility and Ethics in Accounting
Type: Book
ISBN: 978-1-78560-973-2

Keywords

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