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Article
Publication date: 25 June 2019

Gus Nasif, R.M. Barron, Ram Balachandar and Julio Villafuerte

Application of cold spray technology may exhibit significant benefits for the additive manufacturing process, particularly for producing intricate objects. To ascertain…

Abstract

Purpose

Application of cold spray technology may exhibit significant benefits for the additive manufacturing process, particularly for producing intricate objects. To ascertain the feasibility of such an application, this paper aims to present a numerical investigation of the effect of scaling down a convergent-divergent (de Laval) nozzle, which is typically used in the cold spray industry, on the compressible flow parameters and thermal characteristics.

Design/methodology/approach

The Navier–Stokes equations and energy equation governing compressible flow are numerically solved using a finite volume method with a coupled solver. The conjugate heat transfer technique is used to couple fluid and solid heat transfer domains and predict the local heat transfer coefficient between the solid and fluid. The use of various RANS turbulence models has also been investigated to quantify the effect of the turbulence model on the simulation.

Findings

The numerical results reveal that the flow and thermal characteristics are altered as the convergent-divergent nozzle is scaled down. The static pressure and temperature profiles at any section in the nozzle are shifted toward higher values, while the Mach number profile at any section in the nozzle is shifted toward a lower Mach number. The turbulent kinetic energy at the nozzle exit increases with the scaling down of the nozzle geometry. This study also provides convincing evidence that the adiabatic approach is still suitable even though the temperature of the nozzle wall is extremely high, as required for industrial application. Results indicate that it is feasible to use the available capabilities of the cold spray technology for additive manufacturing after scaling down the nozzle.

Originality/value

The idea of adopting cold spray technology for additive manufacturing is new and innovative. To develop this idea into a viable commercial product, a thorough understanding of the flow physics within a cold spray nozzle is required. The simulation results discussed in this paper demonstrate the effect that scaling down of a convergent-divergent nozzle has on the flow characteristics in the nozzle.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 29 no. 7
Type: Research Article
ISSN: 0961-5539

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Book part
Publication date: 30 June 2016

Ho Kwan Cheung, Eden King, Alex Lindsey, Ashley Membere, Hannah M. Markell and Molly Kilcullen

Even more than 50 years after the Civil Rights Act of 1964 prohibited discrimination toward a number of groups in employment settings in the United States, workplace…

Abstract

Even more than 50 years after the Civil Rights Act of 1964 prohibited discrimination toward a number of groups in employment settings in the United States, workplace discrimination remains a persistent problem in organizations. This chapter provides a comprehensive review and analysis of contemporary theory and evidence on the nature, causes, and consequences of discrimination before synthesizing potential methods for its reduction. We note the strengths and weaknesses of this scholarship and highlight meaningful future directions. In so doing, we hope to both inform and inspire organizational and scholarly efforts to understand and eliminate workplace discrimination.

Details

Research in Personnel and Human Resources Management
Type: Book
ISBN: 978-1-78635-263-7

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Article
Publication date: 22 March 2013

Ming‐Han Lin and Chin‐Tai Chen

The purpose of this paper is to study the effects of ion‐slip current and Hall current on the formation of longitudinal vortices in natural convection flow over a heated…

Abstract

Purpose

The purpose of this paper is to study the effects of ion‐slip current and Hall current on the formation of longitudinal vortices in natural convection flow over a heated horizontal plate.

Design/methodology/approach

The criterion on the position marking on the onset of longitudinal vortices is defined in the present paper. The results show that the onset position characterized by the Grashof number depends on the Prandtl number, the Reynolds number, the wave number, the Hall parameter, the ion‐slip parameter, and the Hartmann number.

Findings

The flow becomes more stable as the magnetic field increases. However, the destabilizing effect is found on the flow when the Hall and ion‐slip currents are presented.

Research limitations/implications

The standard method of linear stability model is applied, with terms higher than first order in disturbance quantities being neglected.

Practical implications

The problem of MHD natural convection flow with Hall and ion‐slip currents has many important engineering applications, e.g. power generators, Hall accelerators and flows in channels and ducts.

Originality/value

This study is to check the validity of the assumptions that the conditions of Hall and ion‐slip currents can be ignored.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 23 no. 2
Type: Research Article
ISSN: 0961-5539

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Book part
Publication date: 5 June 2018

Margaret P. Weiss

Students with learning disabilities (LD) have a wide range of academic needs. Since the passing of P.L. 94-142, significant research has been done on effective…

Abstract

Students with learning disabilities (LD) have a wide range of academic needs. Since the passing of P.L. 94-142, significant research has been done on effective interventions for this group of students. Starting with the Learning Disabilities Research Institutes through the recent Handbook of Learning Disabilities, reviews of lines of research make several broad ideas about interventions clear. Primary among these is that students with LD can learn if provided with appropriate, effective instruction. Specifics about this idea and its implications are discussed in the following chapter.

Details

Viewpoints on Interventions for Learners with Disabilities
Type: Book
ISBN: 978-1-78743-089-1

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Article
Publication date: 1 June 2015

Muhammad Ali Asadullah, Jean Marie Peretti, Arain Ghulam Ali and Marina Bourgain

The purpose of this paper was to test the mediating role of training duration in relationship between firm characteristics and training evaluation practices. In this…

Abstract

Purpose

The purpose of this paper was to test the mediating role of training duration in relationship between firm characteristics and training evaluation practices. In this paper, the authors also investigated if this mediating effect differs with respect to the size of the firm.

Design/methodology/approach

The authors collected data from 260 professionals of 90 call centers.

Findings

The authors found that training duration mediates the relationship between firm size and training evaluation. The authors also found that indirect effect of firm size on training evaluation through training duration differs across different levels of firm size but not across different levels of ownership.

Research limitations/implications

This is a cross-sectional study that emphasized on training evaluation practices only.

Practical implications

The study has implication for both evaluation researchers and practitioners in terms of designing training evaluation policies and practices.

Originality/value

This is the first study in its nature that explains the intervening role of training duration in relationship of firm characteristics and training evaluation practices.

Details

European Journal of Training and Development, vol. 39 no. 5
Type: Research Article
ISSN: 2046-9012

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Article
Publication date: 30 March 2010

Rupashree Baral and Shivganesh Bhargava

This paper aims to examine the role of work‐family enrichment in the relationships between organizational interventions for work‐life balance (job characteristics…

Abstract

Purpose

This paper aims to examine the role of work‐family enrichment in the relationships between organizational interventions for work‐life balance (job characteristics, work‐life benefits and policies, supervisor support and work‐family culture) and job outcomes (job satisfaction, affective commitment and organizational citizenship behaviour). It is hypothesized that organizational interventions for work‐life balance will be positively related to job outcomes and work‐to‐family enrichment will mediate these relationships.

Design/methodology/approach

Data were collected from 216 managerial employees through a structured questionnaire from four organizations in India representing manufacturing and information technology (IT) sectors. Analysis was done using multiple regressions.

Findings

Job characteristics were positively related to all the measures of job outcomes. Supervisor support and work‐family culture were positively related to job satisfaction and affective commitment. No significant association was found between work‐life benefits and policies (WLBPs) and any of the job outcome measures. Job characteristics and supervisor support were positively related to work‐to‐family enrichment. Work‐to‐family enrichment mediated the relationships between job characteristics and all job outcomes and between supervisor support and affective commitment.

Research limitations/implications

The correlational design prevents conclusions about causality.

Practical implications

The findings have implications for designing jobs, developing supportive work‐family culture and managing employee work‐family interface for maximizing individual and organizational outcomes.

Originality/value

The study reflected on the work‐family domain relationships in a novel socio‐cultural context and demonstrated the mediating role of work‐family enrichment in the relationships between organizational interventions for work‐life balance and job outcomes.

Details

Journal of Managerial Psychology, vol. 25 no. 3
Type: Research Article
ISSN: 0268-3946

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Article
Publication date: 18 May 2012

Carolin Plewa, Indrit Troshani, Anthony Francis and Giselle Rampersad

Despite the growing prominence of innovation, limited studies examine the adoption of applications that support innovation processes. The purpose of this study is to…

Abstract

Purpose

Despite the growing prominence of innovation, limited studies examine the adoption of applications that support innovation processes. The purpose of this study is to investigate the adoption of innovation management applications (IMAs).

Design/methodology/approach

The paper draws on qualitative and quantitative evidence sourced from innovation development and commercialization functions including R&D, marketing, and administration at a university and technology transfer office.

Findings

The paper contributes to literature by isolating determinants that affect the adoption of IMAs and their link to innovation process performance, confirming the importance of perceived usefulness and compatibility of IMAs to user's work styles.

Originality/value

There is paucity of research concerning the adoption of IMAs which present unique challenges due to their idiosyncrasies. This study contributes by proposing an adoption model and validating it. It also links IMA adoption to innovation process performance, thereby filling a gap in extant technology adoption research.

Details

Industrial Management & Data Systems, vol. 112 no. 5
Type: Research Article
ISSN: 0263-5577

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Article
Publication date: 3 April 2017

Rohana Abdul Hamid, Roslinda Nazar and Ioan Pop

The purpose of this paper is to numerically study the boundary layer problem for the case of two-dimensional flow of dusty fluid over a shrinking surface in the presence…

Abstract

Purpose

The purpose of this paper is to numerically study the boundary layer problem for the case of two-dimensional flow of dusty fluid over a shrinking surface in the presence of the fluid suction at the surface.

Design/methodology/approach

The governing equations of the problem are reduced to the system of ordinary differential equations using the similarity transformation and then solved using the bvp4c method in the Matlab software.

Findings

The effects of the drag coefficient parameter L, the fluid–particle interaction parameter δ, the suction parameter s and the particle loading parameter ω on the flow of the permeable shrinking sheet are investigated. It is found that the aforementioned parameters have different effects in the shrinking sheet flow. This study has also succeeded in discovering the second solution, and through the stability analysis, it is suggested that the solution is unstable and not physically realizable in practice.

Practical implications

The current findings add to a growing body of literature on the boundary layer problem in the dusty fluid. The dusty fluid is significant in various practical applications such as in the transporting suspended powdered materials through pipes, propulsion and combustion in rockets, the flow of blood in arteries, wastewater treatment and as corrosive particles in engine oil flow.

Originality/value

Even though the dusty fluid problem has been extensively studied in the flow of the stretching sheet, limited findings can be found over a shrinking flow. In fact, this is the first study to discover the second solution in the dusty fluid problem.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 27 no. 4
Type: Research Article
ISSN: 0961-5539

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Article
Publication date: 1 December 2004

Ranjita Misra and Rashmi Gupta

The purpose of this study was to examine the health promotion behaviours of Gujarati Asian Indian immigrants in the United States. Although there is an abundance of…

Abstract

The purpose of this study was to examine the health promotion behaviours of Gujarati Asian Indian immigrants in the United States. Although there is an abundance of literature on health promotion behaviours, research on Asian Indian immigrant’s health promotion behaviour remains unexplored. The research was conducted on a national sample of 261 Gujurati immigrants via survey questionnaire. Apath model was utilised to test predictors of health promotion behaviours among the respondents. Findings reveal that health promotion behaviours were positively associated with the respondent’s age, number of work hours and negatively associated with meal change to a more western diet. Implications for social work practitioners are discussed.

Details

International Journal of Sociology and Social Policy, vol. 24 no. 12
Type: Research Article
ISSN: 0144-333X

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Article
Publication date: 5 March 2018

Mariam Shahzadi, Shahab Alam Malik, Mansoor Ahmad and Asma Shabbir

The purpose of this paper is to explore the relationship between restaurant key attributes, customer satisfaction and behavioral intentions. The mediating role of customer…

Abstract

Purpose

The purpose of this paper is to explore the relationship between restaurant key attributes, customer satisfaction and behavioral intentions. The mediating role of customer satisfaction is assessed between restaurants’ key attributes of service quality and behavioral intentions.

Design/methodology/approach

Data were collected from a sample of 296 customers dining in the fine dining restaurants of Pakistan through a self-administered questionnaire. The data were then analyzed through regression analysis and gap analysis. Model fitness was checked in SPSS AMOS through CFA.

Findings

The findings suggest that the key restaurant attributes have a significant positive effect on behavioral intentions. Customer satisfaction partially mediates the relationship between key restaurant attributes and behavioral intentions. The findings also suggest that there is a significant gap between the perceptions of customers regarding the importance and performance of key restaurant attributes.

Practical implications

The result indicates that food taste and environmental cleanliness are the cornerstones of fine dining restaurants’ success in Pakistan and are among the strongest predictor of customer satisfaction and behavioral intentions; while improvement efforts should be made in four key areas, i.e., healthy food option, food freshness, food safety and fair price.

Originality/value

No comparative study has been directed in fine dining restaurants of Pakistan with respect to the key restaurants attributes, i.e., food quality attributes, service quality attributes, atmospheric quality attributes, and other attributes which have been analyzed in the current study. This research was conducted to investigate the perceptions of customers toward the fine dining restaurants of Pakistan to measure the key restaurants’ attributes that influence customers’ satisfaction and their post-dining behavioral intentions. This study will facilitate restaurants’ managers to understand the stronger and as well as the weaker aspects of service quality and permit them to investigate the factors which contribute toward customers’ satisfaction and their post-dining behavioral intentions in order to build and maintain long-term relationship between restaurants and customers.

Details

International Journal of Quality & Reliability Management, vol. 35 no. 3
Type: Research Article
ISSN: 0265-671X

Keywords

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