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1 – 10 of 112
Article
Publication date: 3 November 2023

Arun G. Nair, Tide P.S. and Bhasi A.B.

The mixing of fuel and air plays a pivotal role in enhancing combustion in supersonic regime. Proper mixing stabilizes the flame and prevents blow-off. Blow-off is due to the…

Abstract

Purpose

The mixing of fuel and air plays a pivotal role in enhancing combustion in supersonic regime. Proper mixing stabilizes the flame and prevents blow-off. Blow-off is due to the shorter residence time of fuel and air in the combustor, as the flow is in supersonic regime. The flame is initiated in the local subsonic region created using a flameholder within the supersonic combustor. This study aims to design an effective flameholder which increases the residence time of fuel in the combustor allowing proper combustion preventing blow-off and other instabilities.

Design/methodology/approach

The geometry of the strut-based flameholder is altered in the present study to induce a streamwise motion of the fluid downstream of the strut. The streamwise motion of the fluid is initiated by the ramps and grooves of the strut geometry. The numerical simulations were carried out using ANSYS Fluent and are validated against the available experimental and numerical results of cold flow with hydrogen injection using plain strut as the flameholder. In the present study, numerical investigations are performed to analyse the effect on hydrogen injection in strut-based flameholders with ramps and converging grooves using Reynolds-averaged Navier–Stokes equation coupled with Menter’s shear stress transport k-ω turbulence model. The analysis is done to determine the effect of geometrical parameters and flow parameter on the flow structures near the base of the strut where thorough mixing takes place. The geometrical parameters under consideration include the ramp length, groove convergence angle, depth of the groove, groove compression angle and the Mach number. Two different strut configurations, namely, symmetric and asymmetric struts were also studied.

Findings

Higher turbulence and complex flow structures are visible in asymmetric strut configuration which develops better mixing of hydrogen and air compared to symmetric strut configuration. The variation in the geometric parameters develop changes in the fluid motion downstream of the strut. The fluid passing through the converging grooves gets decelerated thereby reducing the Mach number by 20% near the base of the strut compared to the straight grooved strut. The shorter ramps are found to be more effective, as the pressure variation in lateral direction is carried along the strut walls downstream of the strut increasing the streamwise motion of the fluid. The decrease in the depth of the groove increases the recirculation zone downstream of the strut. Moreover, the increase in the groove compression angle also increases the turbulence near the base of the strut where the fuel is injected. Variation in the injection port location increases the mixing performance of the combustor by 25%. The turbulence of the fuel jet stream is considerably changed by the increase in the injection velocity. However, the change in the flow field properties within the flow domain is marginal. The increase in fuel mass flow rate brings about considerable change in the flow field inducing stronger shock structures.

Originality/value

The present study identifies the optimum geometry of the strut-based flameholder with ramps and converging grooves. The reaction flow modelling may be performed on the strut geometry incorporating the design features obtained in the present study.

Details

Aircraft Engineering and Aerospace Technology, vol. 96 no. 1
Type: Research Article
ISSN: 1748-8842

Keywords

Article
Publication date: 6 November 2023

Amira Schiff and Chen Kertcher

This study delves into the transformation of UAE-Israel relations, which transitioned from a long-term rivalry to a formal peace agreement in 2020. It aims to uncover the…

Abstract

Purpose

This study delves into the transformation of UAE-Israel relations, which transitioned from a long-term rivalry to a formal peace agreement in 2020. It aims to uncover the multifaceted elements that influenced both nations’ pursuit of bilateral negotiations, with a special emphasis on the role of unofficial collaboration.

Design/methodology/approach

Employing a case study approach, the research traces the evolution of the UAE-Israel ties, mapping their progression from covert collaborations to public accords. This exploration is set against a backdrop of political, economic, and societal factors that have historically characterized the broader Israel-Arab conflict. Real-world dynamics and theoretical constructs are analyzed in tandem to derive comprehensive insights.

Findings

Key drivers for the transformation of UAE-Israel relations included the threat from Iran, internal disturbances, economic stresses, and the strategic advantages of discreet diplomacy. Exogenous catalysts like the Covid-19 pandemic and Israel's annexation plans in 2019-2020 played pivotal roles, capitalizing on pre-existing covert collaborations and shared regional interests. Constructive strategies, notably inducements, effectively reshaped their adversarial relationship. The resultant U.S.-mediated agreement conferred strategic, security, economic, and diplomatic benefits to both parties. Importantly, the potency of conengagement conflict management strategy, especially when bolstered by exogenous factors and growing mutual interest, emerged as a game-changer in terminating longstanding rivalries.

Originality/value

This study offers a unique perspective on Israel-UAE relations, emphasizing the significance of covert engagements, inducements, and the innovative conengagement strategy in conflict resolution. By examining a relationship devoid of direct armed conflict, the research underscores the interplay of economic, political, and societal factors in reshaping rivalries. This case study serves as a testament to the potential for transformative change in enduring disputes when the right conditions and strategies align, supplementing conventional perspectives and offering valuable implications for policy and mediation initiatives in the Middle East.

Details

International Journal of Conflict Management, vol. 35 no. 1
Type: Research Article
ISSN: 1044-4068

Keywords

Abstract

Details

Children and the Climate Migration Crisis: A Casebook for Global Climate Action in Practice and Policy
Type: Book
ISBN: 978-1-80455-910-9

Article
Publication date: 1 January 2024

Rona Elizabeth Kurian

The developmental relation of informal mentoring within the organization could aid in tiding over the challenges that arise with change. The purpose is to explore the…

Abstract

Purpose

The developmental relation of informal mentoring within the organization could aid in tiding over the challenges that arise with change. The purpose is to explore the relationship between informal mentoring within the organization and change supportive behaviour to put forth a framework describing the catalytic and a priori role of informal mentoring within the organization in augmenting change readiness and facilitating change supportive behaviour for a successful organizational change.

Design/methodology/approach

Drawing on the appraisal theory of stress coping, the paper put forward a conceptual framework describing the mechanisms through which informal mentoring within the organization leads to change supportive behaviour among the individuals.

Findings

The conceptual model explains how informal mentoring within the organization develops optimism, resilience, self-efficacy and trust and facilitates change readiness among the individuals, which leads to change supportive behaviours in them. The paper also describes the influence of poor change management history and organizational identity threat on the relations.

Research limitations/implications

The paper explains the underexplored relationship between mentoring and change readiness. It also sheds light on the importance of exploring the micro-foundations of a macro-level phenomenon. Further research should focus on the differential effect of different forms of mentoring on change readiness.

Originality/value

The paper is developed based on the review of extant literature and applying the theoretical lens of appraisal theory of stress coping to the phenomenon. The paper explains the micro-foundation of the phenomenon and describes how informal mentoring would lead to a change supportive behaviour among the individuals.

Details

Journal of Organizational Change Management, vol. 37 no. 1
Type: Research Article
ISSN: 0953-4814

Keywords

Article
Publication date: 26 March 2024

Santiago Melián-González and Jacques Bulchand Gidumal

The purpose of this study is to analyze whether higher tourism development in a region is associated with lower-quality employment in that region.

Abstract

Purpose

The purpose of this study is to analyze whether higher tourism development in a region is associated with lower-quality employment in that region.

Design/methodology/approach

The analysis is based on the last two editions of the European Working Conditions Survey and on the tourism development of European regions. Two samples were studied (2015 and 2021).

Findings

Tourism development does not affect the quality of employment in regions. The institutional regime of the country to which the region belongs is associated with the job quality (JQ) in the region.

Research limitations/implications

Only subjective indicators of employment quality are considered in the analysis.

Practical implications

The quality of employment is related to the institutional regime. Policymakers should consider the institutional factors of social democratic countries to improve the low quality of tourism occupations.

Originality/value

Research on the quality of employment in tourism has mostly focused on tourism occupations without considering determinants other than industry characteristics. This research is unique because it includes both the institutional view of JQ and the overall regional employment.

目的

分析一个地区较高的旅游业发展是否与该地区较低品质的就业有关

设计/方法/途径

分析基于最近两版的欧洲工作条件调查和欧洲地区的旅游业发展。研究了两个样本, 分别为 2015 年和 2021 年。

研究结果

旅游业发展不影响地区就业品质。该地区所属国家的制度体系与该地区的就业品质相关。

独创性

旅游就业品质的研究多集中在旅游职业, 没有考虑产业特征以外的决定因素。这项研究的独特之处在于它既包含了工作品质的制度观点, 也包含了整体地区就业情况。

研究限制/影响

分析中仅考虑就业品质的主观指标。

实践意义

就业品质与制度体系有关; 因此, 政策制定者应考虑社会民主国家的体制因素, 以改善某些旅游职业的低品质状况。

Objetivo

Analizar si un mayor desarrollo turístico en una región está asociado a un empleo de menor calidad en dicha región.

Diseño/metodología/enfoque

El análisis se basa en las dos últimas ediciones de la Encuesta Europea sobre las Condiciones de Trabajo y en el desarrollo turístico de las regiones europeas. Se estudiaron dos muestras (2015 y 2021).

Resultados

El desarrollo turístico no afecta a la calidad del empleo en las regiones. El régimen institucional del país al que pertenece la región está asociado a la calidad del empleo en la región.

Originalidad

La investigación sobre la calidad del empleo en el turismo se ha centrado mayoritariamente en las ocupaciones turísticas sin tener en cuenta otros factores determinantes aparte de las características de la industria. Esta investigación es única porque incluye tanto el punto de vista institucional de la calidad del empleo como el empleo regional global.

Limitaciones/implicaciones de la investigación

En el análisis sólo se consideran indicadores subjetivos de la calidad del empleo.

Implicaciones prácticas

La calidad del empleo está relacionada con el régimen institucional. Los responsables políticos deberían tener en cuenta los factores institucionales de los países socialdemócratas para mejorar la baja calidad de las ocupaciones turísticas.

Article
Publication date: 13 March 2024

Zahra Tohidinia

This paper aims to study antiques enthusiasts’ perspectives on the recent stagnancy in the antiques market, along with their suggestions on how the antiques trade can forge a more…

Abstract

Purpose

This paper aims to study antiques enthusiasts’ perspectives on the recent stagnancy in the antiques market, along with their suggestions on how the antiques trade can forge a more secure path forward.

Design/methodology/approach

Using a qualitative analysis approach through netnography, this paper examines archived comments of antiques enthusiasts on a “r/antiques” subreddit.

Findings

This research studies connoisseurs’ insights into the reduction in antiques sales experienced by a wide cross-section of sellers, particularly independent and small business retailers. Specifically, the results of this paper’s discourse analysis show that technological advances on one hand and socioeconomic factors (e.g. income, family structure and lifestyle) on the other hand have had a significant negative impact on demand for antiques. In addition, specific attributes such as authenticity and sustainability emerged as potential key marketing elements for invigorating the broader public’s interest in purchasing antiques.

Originality/value

Despite their significant insights into the antiques market, antiques enthusiasts have not received the academic attention they deserve. Through discourse analysis of comments in an online antiques community, this paper draws attention to the vulnerabilities of antiques markets to a protracted climate of slow sales, while highlighting potential strategies on how to turn the tide for struggling antiques stores.

Details

Journal of Historical Research in Marketing, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1755-750X

Keywords

Article
Publication date: 4 January 2024

Naseer Abbas Khan, Waseem Bahadur, Muhammad Ramzan and Natalya Pravdina

The aim of this study is to look into the associations, both direct and indirect, between a leader empowering behavior and employee turnover intention. Additionally, this study…

Abstract

Purpose

The aim of this study is to look into the associations, both direct and indirect, between a leader empowering behavior and employee turnover intention. Additionally, this study examines the mediating effects of work–family conflict (WFC) and work–family spillover (WFS) in the association between a leader empowering behavior and employee turnover intention. This study also explored how perceived peer support (PPS) may have a moderating effect on these associations.

Design/methodology/approach

A time-lag approach was used in this study to collect data from the 228 participants that made up the sample. Both front-desk employees and their immediate supervisors were included in this sample, which came from diverse tourism enterprises in central China. The research design included two independent time waves that were separated by two months, making it easier to examine the way the variables of interest changed throughout that time.

Findings

The results showed that there is a significant impact of leadership behaviors on WFS, WFC and employee turnover intention. This study showed a significant mediating effect of WFS, however, the influence of WFC as a mediator was not statistically significant. Furthermore, the results suggested that PPS significantly moderated the association between leader empowering behavior and WFS. The findings revealed that the mediating effect of WFS in the association between leader empowering behavior and employee turnover intention.

Originality/value

This study advances knowledge of the impacts of leadership empowering behavior on employee turnover intention through the use of a moderated mediation analysis. Based on the leader member exchange, it offers a distinctive perspective on leadership empowering behaviors to maintain a work–family balance in tourism.

Details

Leadership & Organization Development Journal, vol. 45 no. 2
Type: Research Article
ISSN: 0143-7739

Keywords

Book part
Publication date: 25 March 2024

Heather Yaxley

Informal conversational encounters are explored using free indirect discourse (FID) as a novel storytelling method to gain a multi-generational understanding of the experiences of…

Abstract

Informal conversational encounters are explored using free indirect discourse (FID) as a novel storytelling method to gain a multi-generational understanding of the experiences of women working in public relations (PR) in 1960s/1970s Britain.

Echoing a literary tradition, anonymised transcripts of recordings provide impressionist accounts that immerse the reader in the thoughts and feelings of novelistic characters. An informal network of women narrate their stories with a much younger listener enabling exploration of intergenerational relationships and the intersection of gender and age.

This unstructured approach develops a complex yet natural flow to create unique withness-understandings. The author/narrator introduces a conception of informal conversational encounters, supporting an organic approach of interweaving storying, everyday performance, situated accountings, narrative unfoldings and inside/outside points of view.

An interplay of multiple female voices reveals a degree of symmetry in fractal patterns of women's early career experiences over the duration of a generation. Facilitation of sense-making through intergenerational conversations connects with Mannheim's theory of generational unity.

Women's beginnings of PR careers in 1960s/1970s Britain demonstrate a liberal feminist perspective in taking responsibility for their careers and enjoyment beyond the workplace in a man's world.

Article
Publication date: 29 March 2024

Juan Pedro Mellinas, Jacques Bulchand-Gidumal and María-del-Carmen Alarcón-del-Amo

This paper aims to classify tourist accommodation using data from Booking.com and TripAdvisor and analyse the extent to which the different segments identified differ in terms of…

Abstract

Purpose

This paper aims to classify tourist accommodation using data from Booking.com and TripAdvisor and analyse the extent to which the different segments identified differ in terms of being adults-only.

Design/methodology/approach

In total, 1,535 properties located in nine Spanish sun and beach destinations were examined using a latent class cluster analysis (LCCA). The bias-adjusted three-step approach was used to investigate the differences between belonging to adults-only accommodation or not among the identified clusters.

Findings

Results show that adults-only accommodation tends to belong to the cluster with higher online ratings. In small Spanish islands, adults-only hotels account for a large share (more than 25%) of hotels.

Research limitations/implications

It was not possible to analyse whether the higher rating was due to the accommodation being better or due to the tourists being more satisfied with their stay.

Practical implications

In urban destinations, the model is not widely used. However, in coastal destinations, it is becoming more than a novelty or a new trend.

Social implications

In small Spanish islands, people traveling with children are becoming a minority. Families may feel discriminated against and express dissatisfaction with this situation in the future.

Originality/value

This study covers the gap in the academic literature on this growing hotel segment.

Details

Consumer Behavior in Tourism and Hospitality, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 2752-6666

Keywords

Article
Publication date: 23 August 2023

E.E. Lawrence

Librarianship’s dominant conception of the freedom to read is governed by a liberal principle of noninterference, wherein free readers are those who face no intentional…

Abstract

Purpose

Librarianship’s dominant conception of the freedom to read is governed by a liberal principle of noninterference, wherein free readers are those who face no intentional intervention in their choice of materials. The purpose of this paper is to demonstrate how this account fails to adequately capture systemic threats that impoverish people’s reading lives.

Design/methodology/approach

This conceptual paper deploys informal argumentation to expose a flaw in the dominant account of the freedom to read. The author uses a case study of comparative titles or comps, an editorial decision-making and justificatory convention that reproduces racial inequality in Anglophone trade publishing.

Findings

Comps present one example of how everyday norms and practices of literary production render people’s reading lives pervasively unfree, even absent some intent to interfere in them. The going account of the freedom to read calls, at best, for a greater diversity of book-commodities from which consumers may choose. However, the comp case suggests that this distributive remedy will be insufficient without relevant changes to the institutional arrangements that condition readers' choices in the first place.

Originality/value

This paper draws together insights from Library and Information Science, political philosophy and print culture studies to illuminate limitations in librarianship’s standard conception of the freedom to read. This reveals the need for an alternative, structural account of that freedom with significant implications for practice.

Details

Journal of Documentation, vol. 80 no. 2
Type: Research Article
ISSN: 0022-0418

Keywords

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