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Article
Publication date: 15 August 2016

Brandon Lane, Shawn Moylan, Eric P. Whitenton and Li Ma

Quantitative understanding of the temperatures, gradients and heating/cooling rates in and around the melt pool in laser powder bed fusion (L-PBF) is essential for simulation…

1979

Abstract

Purpose

Quantitative understanding of the temperatures, gradients and heating/cooling rates in and around the melt pool in laser powder bed fusion (L-PBF) is essential for simulation, monitoring and controls development. The research presented here aims to detail experiment design and preliminary results of high speed, high magnification, in-situ thermographic monitoring setup on a commercial L-PBF system designed to capture temperatures and dynamic process phenomena.

Design/methodology/approach

A custom door with angled viewport was designed for a commercial L-PBF system which allows close access of an infrared camera. Preliminary finite element simulations provided size, speed and scale requirements to design camera and optics setup to capture melt pool region temperatures at high magnification and frame rate speed. A custom thermal calibration allowed maximum measurable temperature range of 500°C to 1,025°C. Raw thermographic image data were converted to temperature assuming an emissivity of 0.5. Quantitative temperature results are provided with qualitative observations with discussion regarding the inherent challenges to future thermographic measurements and process monitoring.

Findings

Isotherms around the melt pool change in size depending on the relative location of the laser spot with respect to the stripe edges. Locations near the edges of a stripe are cooled to lower temperatures than the center of a stripe. Temperature gradients are highly localized because of rough or powdery surface. At a specific location, temperatures rise from below the measurable temperature range to above (<550°C to >1100°C) within two frames (<1.11 m/s). Particle ejection is a notable phenomenon with measured ejection speeds >11.7 m/s.

Originality/value

Several works are detailed in the Introduction of this paper that detail high-speed visible imaging (not thermal imaging) of custom or commercial LBPF processes, and lower-speed thermographic measurements for defect detection. However, no work could be found that provides calibrated, high-speed temperature data from a melt-pool monitoring configuration on a commercial L-PBF system. In addition, the paper elucidates several sources of measurement uncertainty (e.g. calibration, emissivity and time and spatial resolution), describes inherent measurement challenges based on observations of the thermal images and discusses on the implications to model validation and process monitoring and control.

Details

Rapid Prototyping Journal, vol. 22 no. 5
Type: Research Article
ISSN: 1355-2546

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Article
Publication date: 1 March 2013

Yonghee Suh

This is a comparative case study of how three high school history teachers in the U.S.A. use art in their practice. The following research question was investigated: How do…

297

Abstract

This is a comparative case study of how three high school history teachers in the U.S.A. use art in their practice. The following research question was investigated: How do secondary history teachers incorporate the arts—paintings, music, poems, novels, and films—in their teaching of history and why? Data were collected from three sources: interviews, observations, and classroom materials. Grounded theory was utilized to analyze the data. Findings suggest these teachers use the arts as historical evidence roughly for three purposes: First, to teach the spirit of an age; second, to teach the history of ordinary people invisible in official historical records; and third, to teach, both with and without art, the process of writing history. Two of the three teachers, however, failed to teach historical thinking skills through art.

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Social Studies Research and Practice, vol. 8 no. 1
Type: Research Article
ISSN: 1933-5415

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Article
Publication date: 14 June 2013

Katri Kauppi, Alistair Brandon‐Jones, Stefano Ronchi and Erik M. van Raaij

The paper examines the moderating role of a purchasing function's absorptive capacity (AC) on the relationship between the use of electronic purchasing tools and category level…

2164

Abstract

Purpose

The paper examines the moderating role of a purchasing function's absorptive capacity (AC) on the relationship between the use of electronic purchasing tools and category level purchasing performance. The authors argue that an e‐purchasing tool may not in itself positively influence performance unless combined with AC as a human interface to maximise its information and transactional improvement potential.

Design/methodology/approach

Survey data collected from 297 procurement executives of large companies in ten countries are analysed using confirmatory factor analysis (CFA) and hierarchical moderated regression.

Findings

The results demonstrate few significant direct effects of e‐purchasing tools on category performance. All performance measures studied are enhanced when dimensions of AC and their interactions with the e‐purchasing tools are added. Specifically, buyer competence, manager competence and communications climate have performance‐enhancing effects. In some cases, AC on its own appears to increase performance more than e‐tools.

Originality/value

This paper is the first to study the moderating effects of AC on the relationship between e‐purchasing tool usage and category performance. Its findings support the view that simply implementing technology does not lead to performance improvements, but that a human interface is required to maximise the information and transactional improvement potential of e‐purchasing tools.

Details

International Journal of Operations & Production Management, vol. 33 no. 7
Type: Research Article
ISSN: 0144-3577

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Book part
Publication date: 5 September 2013

Kimmo Alajoutsijärvi, Katariina Juusola and Marjo Siltaoja

The purpose of the chapter is to elaborate the theory of academic capitalism by focusing on rarely examined forerunners of academic capitalism: namely, business schools.

Abstract

Purpose

The purpose of the chapter is to elaborate the theory of academic capitalism by focusing on rarely examined forerunners of academic capitalism: namely, business schools.

Design/methodology/approach

A research-based essay.

Findings

The findings emphasize that there are different forms of academic capitalism. Our example from Dubai context shows how more extreme form of academic capitalism, which we label Acamanic Capitalism, developed as a result of free educational markets.

Originality/value

The chapter provides scholarly value through novel conceptualization. The phenomenon of acamanic capitalism should also be acknowledged in academia and in critical management education.

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Article
Publication date: 1 January 1978

The Equal Pay Act 1970 (which came into operation on 29 December 1975) provides for an “equality clause” to be written into all contracts of employment. S.1(2) (a) of the 1970 Act…

1510

Abstract

The Equal Pay Act 1970 (which came into operation on 29 December 1975) provides for an “equality clause” to be written into all contracts of employment. S.1(2) (a) of the 1970 Act (which has been amended by the Sex Discrimination Act 1975) provides:

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Managerial Law, vol. 21 no. 1
Type: Research Article
ISSN: 0309-0558

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Article
Publication date: 21 September 2012

Ming‐Long Lee, Kevin C.H. Chiang and Chia‐Wei Lin

During the height of the financial/credit crisis of 2008, the US Internal Revenue Service issued temporary guidance that permits REITs (real estate investment trusts) to retain…

3288

Abstract

Purpose

During the height of the financial/credit crisis of 2008, the US Internal Revenue Service issued temporary guidance that permits REITs (real estate investment trusts) to retain cash and pay “effective stock dividends” through 2009 to meet their income distribution requirement. The purpose of this study is to investigate the policy implications of this guidance on shareholders' wealth and the intra‐industry effects for non‐event, rival REITs when event REITs announced elective stock dividends.

Design/methodology/approach

This study identified the announcements of the Revenue Procedures 2008‐68 and 2009‐15 and subsequent six equity REITs announcing the distribution of effective stock dividends in the first quarter of 2009. To assess their implications, this study adopted the event study methodology and multivariate regressions to examine the REIT price reactions and their distribution to the Revenue Procedure announcements and to the elective stock dividend announcements, respectively.

Findings

The Revenue Procedure announcements have positive wealth effects on the entire REIT market and REITs with higher leverage enjoy larger abnormal returns. During firm stock dividend announcement windows, non‐event, rival REITs have higher positive price reactions when the event firm and the non‐event firm are not alike and their returns have a low correlation coefficient, when the event firm has a large negative abnormal price reaction, and when the event firm pays cash/stock dividends in the mixture of 40 percent:60 percent, instead of 10 percent:90percent.

Practical implications

The results will help REIT investors to make better decisions. This study produces important implications for investors to pick REITs which are likely to experience higher returns at periods of turmoil when announcements about dividend policy changes are expected.

Originality/value

To the best of the authors' knowledge, this is the first study looking into intra‐industry effects of REIT dividend announcements and the policy implications of the elective REIT stock dividends permitted by the US Internal Revenue Service. The results of this study show that the informational signals associated with these announcement events are rich and have intra‐industry implications on REIT share prices.

Details

Journal of Property Investment & Finance, vol. 30 no. 6
Type: Research Article
ISSN: 1463-578X

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Article
Publication date: 1 June 1913

Chemistry as an applied science suffers from the fact that its necessarily close connection with various branches of industry is ill defined and generally very unsatisfactory in…

13

Abstract

Chemistry as an applied science suffers from the fact that its necessarily close connection with various branches of industry is ill defined and generally very unsatisfactory in character. One result of this is that those who have made chemistry their profession find themselves more often than not in the position of having to subordinate their professional instincts to the temporary exigencies of some particular branch of trade and to find their professional status called in question and criticised by those who are not in the profession itself and who have no right to criticise.

Details

British Food Journal, vol. 15 no. 6
Type: Research Article
ISSN: 0007-070X

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Article
Publication date: 8 April 2024

Marcus Wayne Johnson, Anthony Johnson, Langston Clark, Jonathan E. Howe, Traveon Jefferson, Dionte McClendon, Brandon Crooms and Daniel J. Thomas

This study aims to stimulate scholarly attention and practical application pertaining to individuals recognized as “Docs.” Through conducting a comprehensive analysis and…

50

Abstract

Purpose

This study aims to stimulate scholarly attention and practical application pertaining to individuals recognized as “Docs.” Through conducting a comprehensive analysis and acquiring a profound understanding of its many connotations, the objective is to shift attitudes and approaches concerning those who are seen to possess knowledge and value within society.

Design/methodology/approach

For this study, culturally relevant pedagogies were used as theoretical frameworks in addition to Sankofa and concept explication being used as methodologies.

Findings

The authors identified three themes: (1) honorary cultural practice-community nomination of “professahs” and “docs,” (2) (Black) robinhoods – cultural signifiers of distinction and relatability and (3) docs as catalysts – elevating community via consciousness, trust and mentorship as significant understandings of this distinction.

Originality/value

The study emphasizes the importance of “Docs” in both academic and social contexts. The role of “Docs” serves to alleviate potential conflicts of being a Black intellectual. This study further reveals the ways in which Docs align with, promote or possibly undermine established frameworks of thought. Finally, this study provides institutions with opportunities to consider strategies for the utilization, recognition and integration of individuals who are frequently overlooked or undervalued.

Details

Journal for Multicultural Education, vol. 18 no. 4
Type: Research Article
ISSN: 2053-535X

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Article
Publication date: 18 June 2024

Rosina E. Mete, Brandon Djukic and Christine Nielsen

The Canadian Society for Medical Laboratory Science (CSMLS) Peer Support Project was a formal and virtual peer support group pilot for medical laboratory professionals in Canada…

562

Abstract

Purpose

The Canadian Society for Medical Laboratory Science (CSMLS) Peer Support Project was a formal and virtual peer support group pilot for medical laboratory professionals in Canada to determine its application for CSMLS members and obtain information regarding the current state of medical laboratory professionals’ mental health, well-being and burnout. CSMLS learned what is contributing to stress at work, coping strategies and barriers to accessing support or help for their mental health among medical laboratory professionals.

Design/methodology/approach

The qualitative and exploratory pilot study examined medical laboratory professionals from Canada. Two peer support groups were facilitated in April and May 2022 by a trained mental health clinician. Peer support delivery was virtual and delivered via Zoom. The purposive sample featured medical laboratory technologists, Educators and Supervisors/Directors who were CSMLS members. The qualitative analysis was conducted via analytical memos and incorporated both manual and NVivo software analysis.

Findings

Overall themes were identified within the data analysis and included barriers to mental health care; increased stigma for mental health; mixed messaging regarding mental health; feeling invisible; medical laboratory professionals would like to manage stress better but their increasing workload demands and challenges with scheduling and staffing add to their stress. Participants also highlighted their role and its context using metaphors such as “the silent firefighters”, and “the Bass Guitar of the Hospital”. Based on the evaluations, the peer support sessions encouraged participants to address their own mental health, validate their experiences and increase their comfort level in discussing mental health.

Social implications

It identified a potential resource for medical laboratory professionals and determined that further mental health resources would be beneficial for their field. It also identified their strong commitment to patient care and their role as a medical laboratory professional.

Originality/value

To the best of the authors’ knowledge, this study is one of the first to examine peer support as a mental health resource for medical laboratory professionals. Additionally, its focus was on a Canadian population with virtual delivery.

Details

Mental Health and Digital Technologies, vol. 1 no. 2
Type: Research Article
ISSN: 2976-8756

Keywords

Available. Content available
Book part
Publication date: 1 October 2016

Abstract

Details

Symbolic Interactionist Takes on Music
Type: Book
ISBN: 978-1-78635-048-0

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