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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.

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.

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.

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.

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.

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.

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.

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.

In the early 1970s, clinical evidence emerged documenting causal links between prenatal alcohol exposure (PAE) and children’s behaviors as observed by child welfare social workers (CWSWs). Unfortunately, fetal alcohol spectrum disorders (FASD) remain on the margins of public health priorities. The purpose of this study was to elicit the views of child welfare social workers when responding to case of or suspected FASD.

A sample (N = 18) of CWSWs, allied health professionals and foster parents were interviewed.

Findings indicate that social workers struggle with their statutory duty to plan safe care for children with or suspected of having FASD. Emergent themes include struggling with advocacy, professional devaluation and lack of procedural guidance.

Social workers need a clear pathway and FASD knowledge to guide their interventions and enhance their capacity to advocate for affected children.

An abundance of research documents the direct effect of PAE on physical, cognitive and behavioral outcomes. However, few studies focus on the critical interface of children with an FASD entering public care and the social workers responsible for planning their safe care. This study sought to document social workers’ response to this vulnerable cohort of children.

Within the last two decades, entrepreneurship education has become institutionalized in Germany. It is offered as a stand-alone program or as part of a business degree, combining academic knowledge, practical skills, and personal development to enhance the entrepreneurial success of university graduates. While entrepreneurship education has experienced similar growth worldwide, its emergence in Germany is closely tied to the country’s political and economic developments. The significance of entrepreneurship education for a thriving entrepreneurial ecosystem and contemporary economic policy has been instrumental in advancing its academic recognition. This chapter provides a historical analysis of the academization of entrepreneurship in Germany. It explores the recursive and often idiosyncratic processes involving state and financial institutions, companies, and universities that have created, respecified, and mutually reinforced a subdiscipline and field of study. Academic entrepreneurship knowledge successively not only became relevant for starting a business but also for employment within the entrepreneurial infrastructure and beyond. This chapter follows a chronological order, highlighting three key stages in the academization of entrepreneurship education. First, the academic, financial, and political roots (I) of entrepreneurship up until the 1970s. Second, it explores the transformation (II) of entrepreneurship into a viable policy alternative and the challenges faced in establishing complementary research and education in higher education institutions during the 1980s. Finally, it sketches the institutionalization (III) of entrepreneurship as a central driver of government economic policy, allowing for the late bloom of entrepreneurship education and research at universities around the turn of the millennium.

Researchers and practitioners working within transdisciplinary research projects face specific challenges when addressing representation of evidence-based concepts across complex occurrences, particularly when delivering a visitor experience design and documentary film encompassing an extensive cultural and natural heritage timeline period. In this chapter, these challenges are explored from the contrasting points of view of the view of the principal investigator and design lead and the filmmaker and researcher within an ongoing transdisciplinary research project Portalis, which is funded by the ERDF through The Ireland Wales Cooperation Programme.

The Portalis visitor experience design promotes and supports citizen science-based climate action behavioural change within six distinct Irish and Welsh cross-border coastal communities. It explores whether there are any parallels with how we can adapt to climate change now, with a focus on the resilience and innovation evidenced within Waterford's earliest settlements during and after South East Ireland's earlier climate change periods. The design research and the filmic documentation of archaeological and geological surveys is employed to map the story of these early post-glacial settlements 10,000 years ago along the Waterford Estuary. Interwoven through this mapping is a demonstration of how those living along the Estuary are preserving their maritime heritage through citizen science led engagement and community initiatives.

Adding a deep resonance to the research project, singular to Waterford, a new vision is called for; an acknowledgement of Waterford City and its Estuary as an area of unique conservation and growth and a recognition of this much travelled waterway as a designated and protected cultural landscape. A successful transdisciplinary approach creates a rich and accessible resource towards recognising the Estuary's cultural and marine heritage in city planning for the future. In so doing, it broaches the so-called rural-urban divide, adds to the global community of practice and allows for reflection on how urban planning can learn from our past in this context.

Digitally oriented firms are faced with new opportunities and risks in today’s ever-changing world. Drawing upon organisational entrainment theory, this study investigates how supply chain (SC) entrainment improves the effects of digital orientation on firm performance through absorbing risks and exploiting opportunities.

Survey data were collected from 307 Chinese manufactures and analysed using structural equation modelling and regression analysis.

The results show digital orientation absorbs risk through evoking three SC entrainment dimensions (i.e. internal entrainment, entrainment with customers and entrainment with suppliers). Entrainment with customers and suppliers mediate the relationship between internal entrainment and firm performance. An opportunity exploitation mechanism is evidenced by the moderating effects of internal and external entrainment on the relationship between digital orientation and firm performance.

The empirical findings provide timely insights for managers to fully harness the benefits of digital orientation by using SC entrainment, i.e. to match the tempo and pace of internal and external cyclical activities to reduce the risks and increase the benefits of adopting advanced digital technologies. The authors show managers how to adjust their organization’s actions to keep tempo and synchronous phase with their SC partners.

The study introduces and conceptualizes a construct (i.e. SC entrainment) to understand how risks and opportunities arising from digital transformation can be addressed to maximize the value of advanced digital technologies.

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.

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.

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.

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.

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.

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

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).

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.

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

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.

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.

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

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。

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。

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。

分析中仅考虑就业品质的主观指标。

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。

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

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).

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.

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.

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

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.

This article aims to better understand how empowered middle manager engage in change translation? Relying on the notions of building and dwelling strategizing, the authors analyze the micro-practices of middle managers during organizational change, when middle managers are freed from time-consuming administrative activities.

This empirical study relies on a qualitative embedded case study approach that involves comparing two banking units belonging to a large French bank. The qualitative data were collected from three different sources: exploratory and semi-structured interviews, observations and secondary data. The coding analysis enables to distinguish middle managers' dwelling and building strategizing during organizational change.

The study’s findings show how managers translate organizational change relying on both building and dwelling strategizing. By doing so, managers enable to adapt the prescribed strategy to local circumstances and foster front-line empowerment.

Even though the findings are based on the analysis of a single organization, the authors provide several theoretical insights. First, the authors contribute to the recent academic debate in strategy-as-practice literature by showing the recursive relation between building and dwelling strategizing. The authors also shed a new light on middle managers' strategizing by emphasizing the idea that middle managers are not only passive change “translators” but that middle managers enact a real agency in the organizational change process.

From a managerial perspective, the study’s findings enable to enlight what empowering middle managers means in practice. Indeed, the authors show clear empirical illustrations of how middle managers can be empowered by both organizational structure and top-management support. The results also reveal how empowering middle managers enable to empower their team by three different activities: (1) federate the team spirit to facilitate collaboration; (2) develop employees' capabilities and (3) adjust managers' activity according to employees' needs.

While multiple current new ways of organizing encourage to transform organizations from inefficient bureaucracies into flatter and more dynamic project-based teams, calling into question the importance of middle managers' strategic role, this study provides an original case study of an organization that chose to run against the tide and created an additional middle management level.