Anthony A. D’Amico, Analise Debaie and Amy M. Peterson
The aim of this paper is to examine the impact of layer thickness on irreversible thermal expansion, residual stress and mechanical properties of additively manufactured parts.
Abstract
Purpose
The aim of this paper is to examine the impact of layer thickness on irreversible thermal expansion, residual stress and mechanical properties of additively manufactured parts.
Design/methodology/approach
Samples were printed at several layer thicknesses, and their irreversible thermal expansion, tensile strength and flexural strength were determined.
Findings
Irreversible thermal strain increases with decreasing layer thickness, up to 22 per cent strain. Tensile and flexural strengths exhibited a peak at a layer thickness of 200 μm although the maximum was not statistically significant at a 95 per cent confidence interval. Tensile strength was 54 to 97 per cent of reported values for injection molded acrylonitrile butadiene styrene (ABS) and 29 to 73 per cent of those reported for bulk ABS. Flexural strength was 18 to 41 per cent of reported flexural strength for bulk ABS.
Practical implications
The large irreversible thermal strain exhibited that corresponding residual stresses could lead to failure of additively manufactured parts over time. Additionally, the observed irreversible thermal strains could enable thermally responsive shape in additively manufactured parts. Variation in mechanical properties with layer thickness will also affect manufactured parts.
Originality/value
Tailorable irreversible thermal strain of this magnitude has not been previously reported for additively manufactured parts. This strain occurs in parts made with both high-end and consumer grade fused deposition modeling machines. Additionally, the impact of layer thickness on tensile and flexural properties of additively manufactured parts has received limited attention in the literature.
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Sonya Douglass Horsford and Diana D'Amico
The purpose of this paper is to argue that historical research methods offer an innovative and powerful way to examine, frame, explain, and disrupt the study of contemporary…
Abstract
Purpose
The purpose of this paper is to argue that historical research methods offer an innovative and powerful way to examine, frame, explain, and disrupt the study of contemporary issues in educational leadership. More specifically, the authors examine how historical methodology might recast some of the questions educational leadership researchers presently engage and how the act of “doing history” might simultaneously lead to new research agendas and social change.
Design/methodology/approach
This conceptual paper provides a discussion of the explanatory and disruptive power of historical research methods and how intentional ignorance of uncomfortable historical realities, such as racist institutional structures and practices, undermines present-day efforts to advance equity in schools. Using the mainstream achievement gap narrative as an example, the authors consider the ways in which historical scholarship can effectively disrupt current conceptions of educational inequality and opportunity in the USA.
Findings
The paper suggests researchers close the “history gap” by engaging historical research methods in ways that better ground, contextualize, and disrupt the often ahistorical and uncritical ways the field frames present-day challenges like the achievement gap.
Originality/value
This paper explores the explanatory and disruptive power of historical research as a mode of inquiry in education leadership.
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Today's business and organisational community is well‐versed in the conventions of marketing orientation and the new product development process. Each is an integral component of…
Abstract
Today's business and organisational community is well‐versed in the conventions of marketing orientation and the new product development process. Each is an integral component of both specialist texts on new product development (Crawford, 1997; Urban and Hauser, 1993; Hisrich and Peters, 1991; Kuczmarski, 1992) and generalist texts (Kotler, 1996; Stanton et al, 1994; McColl‐Kennedy et al, 1994; Kotler et al, 1994; McCarthy and Perrault, 1990). In the specialist texts, the new product development process can vary. For example, Crawford and Kuczmarski emphasise the contextualisation of the new product development process within a broader and preceding strategic or marketing planning emphasis than does Urban and Hauser. At the same time, some generalist work such as Kotler, McColl‐Kennedy et al, and Zikmund and d'Amico (1993) place decidely more emphasis on establishing a difference between the idea screening and product development stages. Nevertheless, the specialist texts concur on the general procedure being a linear one that involves eleven key stages. This is discussed in more detail in section 3.6.
Philip J. Kitchen and R. Anthony Proctor
The response or non‐response of small businesses to change is an important area of study. Environmental analysis is a crucial corollary to business development and growth…
Abstract
The response or non‐response of small businesses to change is an important area of study. Environmental analysis is a crucial corollary to business development and growth. However, experience of small firms has indicated that the managers of such enterprises may become myopic in relation to changes in the business environment, or may not respond to or notice slow change. This myopia or lethargy exhibited by small firms needs to be avoided if such firms are to survive and grow. Four crucial questions (where is the firm now; where is it heading if it takes no action to change things; where do we want the firm to be; and how might we take it there?) must be answered if small firms wish to survive and grow. It is recommended that environmental analysis coupled with the use of a creativity consultant may help small firms to develop strategies for adjusting to change and avoiding marketing myopia.
Moumita Paul and Siva Reddy Kalluru
This chapter examines the long-run and short-run spillover effects of US quantitative easing (QE) on the money market in India. The study adopts the autoregressive distributed lag…
Abstract
This chapter examines the long-run and short-run spillover effects of US quantitative easing (QE) on the money market in India. The study adopts the autoregressive distributed lag bounds testing co-integration approach for monthly data from September 2008 to May 2019 to investigate the spillover impact. The results reveal that a 10% rise in US QE led to a 25 bps softening of the weighted average call rate and a 2–5 bps hardening of the Treasury Bill. This impact was beyond the active participation by the Reserve Bank of India on the policy rate and liquidity in the system during the QE episodes. It suggests that the Indian money market is susceptible to US QE.
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Jeffrey S. Brooks, Anthony H. Normore and Jane Wilkinson
The purpose of this paper is to explore theoretical connections between educational leadership for social justice and support for immigration. The authors seek to identify…
Abstract
Purpose
The purpose of this paper is to explore theoretical connections between educational leadership for social justice and support for immigration. The authors seek to identify strengths, weaknesses and opportunities for further study and improved practice.
Design/methodology/approach
This is a theoretical research paper that introduces, evaluates and expands two frameworks for understanding leadership and immigration.
Findings
Findings suggested that there is a need for educational leadership scholars to more purposefully investigate issues related to social justice and immigration.
Originality/value
This study offers a novel theoretical perspective on leadership, social justice and immigration.