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1 – 10 of over 16000
Article
Publication date: 1 March 2004

Thomas Li‐Ping Tang, Roberto Luna‐Arocas, Toto Sutarso and David Shin‐Hsiung Tang

This research examines the love of money as a moderator and as a mediator of the self‐reported income‐pay satisfaction relationship among university professors…

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Abstract

This research examines the love of money as a moderator and as a mediator of the self‐reported income‐pay satisfaction relationship among university professors (lecturers). Hierarchical multiple regression results showed that the interaction effect between self‐reported income and the love of money on pay satisfaction was significant. For high‐love‐of‐money professors (lecturers), the relationship between income and pay satisfaction was positive and significant, however, for low‐love‐of‐money professors (lecturers), the relationship was not significant. High‐love‐of‐money participants had lower pay satisfaction than low‐love‐of‐money participants when the self‐reported income was below $89,139.53. When income was higher than $89,139.53, the pattern of pay satisfaction was reversed. Further, the love of money was a mediator of the self‐reported income‐pay satisfaction relationship. Income increases the love of money that, in turn, is used as a “frame of reference” to evaluate pay satisfaction.

Details

Journal of Managerial Psychology, vol. 19 no. 2
Type: Research Article
ISSN: 0268-3946

Keywords

Abstract

Details

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

Article
Publication date: 2 August 2021

Modupeola Dada, Patricia Popoola and Ntombi Mathe

This study aims to review the recent advancements in high entropy alloys (HEAs) called high entropy materials, including high entropy superalloys which are current…

Abstract

Purpose

This study aims to review the recent advancements in high entropy alloys (HEAs) called high entropy materials, including high entropy superalloys which are current potential alternatives to nickel superalloys for gas turbine applications. Understandings of the laser surface modification techniques of the HEA are discussed whilst future recommendations and remedies to manufacturing challenges via laser are outlined.

Design/methodology/approach

Materials used for high-pressure gas turbine engine applications must be able to withstand severe environmentally induced degradation, mechanical, thermal loads and general extreme conditions caused by hot corrosive gases, high-temperature oxidation and stress. Over the years, Nickel-based superalloys with elevated temperature rupture and creep resistance, excellent lifetime expectancy and solution strengthening L12 and γ´ precipitate used for turbine engine applications. However, the superalloy’s density, low creep strength, poor thermal conductivity, difficulty in machining and low fatigue resistance demands the innovation of new advanced materials.

Findings

HEAs is one of the most frequently investigated advanced materials, attributed to their configurational complexity and properties reported to exceed conventional materials. Thus, owing to their characteristic feature of the high entropy effect, several other materials have emerged to become potential solutions for several functional and structural applications in the aerospace industry. In a previous study, research contributions show that defects are associated with conventional manufacturing processes of HEAs; therefore, this study investigates new advances in the laser-based manufacturing and surface modification techniques of HEA.

Research limitations/implications

The AlxCoCrCuFeNi HEA system, particularly the Al0.5CoCrCuFeNi HEA has been extensively studied, attributed to its mechanical and physical properties exceeding that of pure metals for aerospace turbine engine applications and the advances in the fabrication and surface modification processes of the alloy was outlined to show the latest developments focusing only on laser-based manufacturing processing due to its many advantages.

Originality/value

It is evident that high entropy materials are a potential innovative alternative to conventional superalloys for turbine engine applications via laser additive manufacturing.

Details

World Journal of Engineering, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1708-5284

Keywords

Abstract

Details

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

Article
Publication date: 25 November 2021

Carolina P. Naveira-Cotta, Jian Su, Paulo Lucena Kreppel Paes, Philippe R. Egmont, Rodrigo P.M. Moreira, Gabriel Caetano G.R. da Silva and André Sampaio Monteiro

The purpose of this paper is to investigate the impact of semi-circular zigzag-channel printed circuit heat exchanger (PCHE) design parameters on heat transfer and…

Abstract

Purpose

The purpose of this paper is to investigate the impact of semi-circular zigzag-channel printed circuit heat exchanger (PCHE) design parameters on heat transfer and pressure drop of flows under high Reynolds numbers and provide new thermal-hydraulic correlations relevant to conditions encountered in natural gas processing plants.

Design/methodology/approach

The correlations were developed using three-dimensional steady-state computational fluid dynamics simulations with varying semicircular channel diameter (from 1 to 5 mm), zigzag angle (from 15° to 45°) and Reynolds number (from 40,000 to 100,000). The simulation results were validated by comparison with experimental results and existing correlations.

Findings

The results revealed that the thermal-hydraulic performance was mostly affected by the zigzag angle, followed by the ratio of the zigzag channel length to the hydraulic diameter. Overall, smaller zigzag angles favored heat transfer intensification while keeping reasonably low pressure drops.

Originality/value

This study is, to date, the only one providing thermal-hydraulic correlations for PCHEs with zigzag channels under high Reynolds numbers. Besides, the broad range of parameters considered makes the proposed correlations valuable PCHE design tools.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 32 no. 8
Type: Research Article
ISSN: 0961-5539

Keywords

Content available
Book part
Publication date: 3 June 2008

Abstract

Details

The Worldwide Transformation of Higher Education
Type: Book
ISBN: 978-0-7623-1487-4

Book part
Publication date: 16 July 2019

Mathew Donald

Abstract

Details

Leading and Managing Change in the Age of Disruption and Artificial Intelligence
Type: Book
ISBN: 978-1-78756-368-1

Book part
Publication date: 10 August 2017

Michael Seth Friedson, Mikaila Mariel Lemonik Arthur and Allison Pope Burger

Past research suggests that whether pregnancies are wanted, unwanted, or mistimed may influence breastfeeding behavior. The purpose of this chapter is to develop a more…

Abstract

Past research suggests that whether pregnancies are wanted, unwanted, or mistimed may influence breastfeeding behavior. The purpose of this chapter is to develop a more precise understanding of this relationship. Specifically, this chapter asks three questions: first, do pregnancy intentions matter most in sustaining breastfeeding for long or for short durations postpartum; second, at what time postpartum are rates of breastfeeding discontinuation most differentiated by pregnancy intentions; and third, how does poverty (measured here by Medicaid receipt) moderate the relationship between pregnancy intentions and breastfeeding duration.

Logistic regression analysis of survey data from a national sample representative of US mothers is used to determine the relationship of pregnancy intentions to whether breastfeeding continues for various durations and through various intervals after birth. Interaction terms between pregnancy intentions and mother’s Medicaid status are used to test for relationships specific to poor or nonpoor mothers between pregnancy intentions and breastfeeding duration.

Results show that pregnancy timing matters most for sustaining breastfeeding for durations past 6 months and that differences in rates of breastfeeding discontinuation between mothers with wanted, unwanted, and mistimed pregnancies are most pronounced in the 3–7 months postpartum period. In addition, findings show that Medicaid recipients (but not nonrecipients) are less likely to exclusively breastfeed for 6 months when their pregnancies are mistimed.

The literature on fundamental causes of health disparities typically suggests that poverty impairs access to resources necessary for effective planning to achieve desirable health outcomes. This study’s results, however, show that planning of pregnancies is more critical for poor mothers to sustain exclusive breastfeeding. Further research is needed to explain this relationship. The results also suggest that policy interventions to help mothers with unplanned pregnancies to sustain breastfeeding should target the period from 3 to 7 months postpartum.

These findings can help shape policies for facilitating the continuation of breastfeeding for durations recommended by health authorities and advance our understanding of the effects of poverty on health behaviors.

Details

Health and Health Care Concerns Among Women and Racial and Ethnic Minorities
Type: Book
ISBN: 978-1-78743-150-8

Keywords

Article
Publication date: 31 July 2019

Enying Li, Zheng Zhou, Hu Wang and Kang Cai

This study aims to suggest and develops a global sensitivity analysis-assisted multi-level sequential optimization method for the heat transfer problem.

Abstract

Purpose

This study aims to suggest and develops a global sensitivity analysis-assisted multi-level sequential optimization method for the heat transfer problem.

Design/methodology/approach

Compared with other surrogate-assisted optimization methods, the distinctive characteristic of the suggested method is to decompose the original problem into several layers according to the global sensitivity index. The optimization starts with the several most important design variables by the support vector regression-based efficient global optimization method. Then, when the optimization process progresses, the filtered design variables should be involved in optimization one by one or the setting value. Therefore, in each layer, the design space should be reduced according to the previous optimization result. To improve the accuracy of the global sensitivity index, a novel global sensitivity analysis method based on the variance-based method incorporating a random sampling high-dimensional model representation is introduced.

Findings

The advantage of this method lies in its capability to solve complicated problems with a limited number of sample points. Moreover, to enhance the reliability of optimum, the support vector regression-based global efficient optimization is used to optimize in each layer.

Practical implications

The developed optimization tool is built by MATLAB and can be integrated by commercial software, such as ABAQUS and COMSOL. Lastly, this tool is integrated with COMSOL and applied to the plant-fin heat sink design. Compared with the initial temperature, the temperature after design is over 49°. Moreover, the relationships among all design variables are also disclosed clearly.

Originality/value

The D-MORPH-HDMR is integrated to obtain the coupling relativities among the design variables efficiently. The suggested method can be decomposed into multiplier layers according to the GSI. The SVR-EGO is used to optimize the sub-problem because of its robustness of modeling.

Details

Engineering Computations, vol. 37 no. 2
Type: Research Article
ISSN: 0264-4401

Keywords

Book part
Publication date: 13 April 2022

Lawrence Hoc Nang Fong

Experimental design has long been used by psychology and consumer behavior researchers to examine causal effects of interventions on human responses. However, it remains…

Abstract

Experimental design has long been used by psychology and consumer behavior researchers to examine causal effects of interventions on human responses. However, it remains underutilized in hospitality and tourism research. Furthermore, problems in design, implementation, and report of results were identified in previous hospitality and tourism publications. It is imperative to equip hospitality and tourism experimenters with sophisticated and state-of-the-art knowledge about experimental design, and to draw their attention to some crucial, but easily neglected, issues in designing the experiment and writing the experimental research paper. Given these reasons, this book chapter discusses some key issues in experimental design and provides corresponding insights related to the sections of introduction, literature review, hypothesis, method, analysis, and results in an experimental research paper, while the uniqueness of hospitality and tourism is considered. It is expected that the chapter will be useful for hospitality and tourism researchers to plan, conduct, and report their experimental studies in the future.

Details

Contemporary Research Methods in Hospitality and Tourism
Type: Book
ISBN: 978-1-80117-546-3

Keywords

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