Search results
1 – 10 of 11Wenchang Wu, Zhenguo Yan, Yaobing Min, Xingsi Han, Yankai Ma and Zhong Zhao
The purpose of the present study is to develop a new numerical framework that can predict the supersonic base flow more accurately, including the development of axisymmetrically…
Abstract
Purpose
The purpose of the present study is to develop a new numerical framework that can predict the supersonic base flow more accurately, including the development of axisymmetrically separated shear layer and recompression shock. To this end, two aspects are improved and combined, i.e. a newly self-adaptive turbulence eddy simulation (SATES) turbulence modeling method and a high-order discretization numerical scheme. Furthermore, the performance of the new numerical framework within a general-purpose PHengLEI software is assessed in detail.
Design/methodology/approach
Satisfactory prediction of the supersonic separated shear layer with unsteady wake flow is quite challenging. By using a unified turbulence model called SATES combining high-order accurate discretization numerical schemes, the present study first assesses the performance of newly developed SATES for supersonic axisymmetric separation flows. A high-order finite differencing-based compressible computational fluid dynamics (CFD) code called PHengLEI is developed and several different numerical schemes are used to investigate the effects on shock-turbulence interactions, which include the monotonic upstream-centered scheme for conservation laws (MUSCL), weighted compact nonlinear scheme (WCNS) and hybrid cell-edge and cell-node dissipative compact scheme (HDCS).
Findings
Compared with the available experimental data and the numerical predictions, the results of SATES by using high-order accurate WCNS or HDCS schemes agree better with the experiments than the results by using the MUSCL scheme. The WCNS and HDCS can also significantly improve the prediction of flow physics in terms of the instability of the annular shear layer and the evolution of the turbulent wake.
Research limitations/implications
The small deviations in the recirculation region can be found between the present numerical results and experimental data, which could be caused by the inaccurate incoming boundary layer condition and compressible effects. Therefore, a proper incoming boundary layer condition with turbulent fluctuations and compressibility effects need to be considered to further improve the accuracy of simulations.
Practical implications
The present study evaluates a high-order discretization-based SATES turbulence model for supersonic separation flows, which is quite valuable for improving the calculation accuracy of aeronautics applications, especially in supersonic conditions.
Originality/value
For the first time, the newly developed SATES turbulence modeling method combining the high-order accurate WCNS or HDCS numerical schemes is implemented on the PHengLEI software and successfully applied for the simulations of supersonic separation flows, and satisfactory results are obtained. The unsteady evolutions of the supersonic annular shear layer are analyzed, and the hairpin vortex structures are found in the simulation.
Details
Keywords
Rebecca Martland, Lucia Valmaggia, Vigneshwar Paleri, Natalie Steer and Simon Riches
Clinical staff working in mental health services experience high levels of work-related stress, burnout and poor well-being. Increased levels of stress, burnout, depression and…
Abstract
Purpose
Clinical staff working in mental health services experience high levels of work-related stress, burnout and poor well-being. Increased levels of stress, burnout, depression and anxiety and poorer mental well-being among health-care workers are associated with more sick days, absenteeism, lower work satisfaction, increased staff turnover and reduced quality of patient care. Virtual reality (VR) relaxation is a technique whereby experiences of pleasant and calming environments are accessed through a head-mounted display to promote relaxation. The purpose of this paper is to describe the design of a study that assesses the feasibility and acceptability of implementing a multi-session VR relaxation intervention amongst mental health professionals, to improve their relaxation levels and mental well-being.
Design/methodology/approach
The study follows a pre–post-test design. Mental health staff will be recruited for five weeks of VR relaxation. The authors will measure the feasibility and acceptability of the VR relaxation intervention as primary outcomes, alongside secondary outcomes evaluating the benefits of VR relaxation for mental well-being.
Findings
The study aims to recruit 20–25 health-care professionals working in both inpatient and specialist community mental health settings.
Originality/value
Research indicates the potential of VR relaxation as a low-intensity intervention to promote relaxation and reduce stress in the workplace. If VR relaxation is shown to be feasible and acceptable, when delivered across multiple sessions, there would be scope for large-scale work to investigate its effectiveness as an approach to enable health-care professionals to de-stress, relax and optimise their mental well-being. In turn, this may consequently reduce turnover and improve stress-related sick leave across health-care services.
Details
Keywords
Anuj Aggarwal, Sparsh Agarwal, Vedant Jaiswal and Poonam Sethi
Introduction: Historically, the corporate governance (CG) framework was designed primarily to safeguard the economic interests of shareholders, as a result of political and legal…
Abstract
Introduction: Historically, the corporate governance (CG) framework was designed primarily to safeguard the economic interests of shareholders, as a result of political and legal interventions, developing into an effective instrument for stakeholders and society in general.
Purpose: The core objectives of the study include: identifying journals/publications responsible for publishing CG studies in India, key CG issues covered by CG researchers, the amount of high-impact CG literature across different time periods, sectors/industries covered by CG researchers and different research instruments (quantitative or qualitative) used in CG studies in India.
Design/methodology: The chapter used a sample of 130 corporate governance studies that fulfil the selection criteria, drawn from the repository of over 100 reputed journals that are either recognised by the Australian Business Deans Council (ABDC) or indexed by SCOPUS. A systematic literature review has been carried out pertaining to CG issues in India, based on various statistical tools, data, industries, research outlets & citations, etc.
Findings: The results show an overwhelming number of studies have assessed the relationship between CG variables and firm performance, which could be measured through a variety of performance metrics such as ROA and ROI. Apart from empirical analysis, many conceptual studies use repetitive basic statistical tools like descriptive statistics or regression analysis. The chapter offers insights into current achievements and future development.
Originality/value: This bibliometric study is a useful guide for policymakers, corporate leaders, research organisations and management faculty to draw insights from work produced by eminent researchers in GC in India.
Details
Keywords
This viewpoint paper aims to provide recommendations in two key leadership areas to improve belonging and connectedness in remote teams.
Abstract
Purpose
This viewpoint paper aims to provide recommendations in two key leadership areas to improve belonging and connectedness in remote teams.
Design/methodology/approach
This paper synthesises recent academic and contextual literature regarding virtual teams, organisational belonging and generations coupled with the authors’ practical experience as a leader within a multi-national organisation.
Findings
Two focus areas related to leaders as critical actors in organisations and the improvement of leaders’ social skills to drive improved socialisation, connection and belonging in the workplace.
Originality/value
In the changing working landscape of continued remote working, wider workforce demographics and declining organisational engagement this paper contributes to literature by presenting two key areas coupled with practical recommendations for HR professionals, leaders, and organisations to focus on to improve belonging.
Details
Keywords
Eugine Tafadzwa Maziriri, Brighton Nyagadza, Tafadzwa C. Maramura and Miston Mapuranga
This study aims to examine how couplepreneurs foster an entrepreneurial mindset in their kids.
Abstract
Purpose
This study aims to examine how couplepreneurs foster an entrepreneurial mindset in their kids.
Design/methodology/approach
A qualitative research approach with semi-structured interviews was used as the data collection technique. Narrative analysis was conducted on a sample of 20 couplepreneurs in Mthatha, South Africa.
Findings
Narratives of how couplepreneurs foster an entrepreneurial mindset in their kids included purchasing toys and games for kids that encourage entrepreneurship; competition and team activities among kids that are related to entrepreneurship; the piggy bank; encouraging kids to read entrepreneurial books; and kid entrepreneur showcases.
Research limitations/implications
Sample size challenges are a notable limitation, including research being conducted in only one province of South Africa. Caution is advised when attempting to generalise the results to other contexts.
Practical implications
Understanding the strategies used by couplepreneurs to instil an entrepreneurial mindset in children can help parents to influence and encourage their children's entrepreneurial growth, resulting in more creative and innovative people who make a positive contribution to society, economy and the community.
Originality/value
While there is a body of literature on couple entrepreneurship, there are shortcomings in studies examining how coupleprenuers in African countries instil an entrepreneurial mindset in their children. As a result, this study aims to complement the current corpus of African literature on entrepreneurship, particularly in the context of South Africa.
Details
Keywords
Do Uyen Tam and Nguyen Thi Mai Trang
Workplace incivility (WI) has been extensively studied. However, less is known about how WI spills over into employees' lives. Building on the work-home resources model, the…
Abstract
Purpose
Workplace incivility (WI) has been extensively studied. However, less is known about how WI spills over into employees' lives. Building on the work-home resources model, the authors develop a conceptual model investigating work-family enrichment (WFE) as the mediator between WI and subjective well-being (SWB) and coping strategies as the moderator of this indirect relationship.
Design/methodology/approach
Survey data were gathered from 266 frontline employees (FLEs) working in different banks in Vietnam, using a convenience sampling technique. The partial least squares structural equation modeling (PLS-SEM) technique was employed.
Findings
The results show that coworker incivility (COWI) predicts a lower level of WFE, which in turn is associated with SWB, while supervisor incivility is not. The authors also found that coping strategies moderate the adverse influence of COWI on employees' WFE.
Originality/value
Although much research has been conducted on the predictors of SWB, little is known about how WI and WFE together impact SWB, and insight into how to buffer the effects of WI are also lacking. This study thus fills a gap in the literature. Implications for theory, practice and future research are discussed.
Details
Keywords
Daniel E. Ufua, Muktar Itai, Ajay Kumar and Mamdouh Abdulaziz Saleh Al-Faryan
This study is focused on achieving operational resilience through the practices of kaizen across the operational structure. The research is based on a case study of a commercial…
Abstract
Purpose
This study is focused on achieving operational resilience through the practices of kaizen across the operational structure. The research is based on a case study of a commercial livestock farm in Nigeria. The study views the practice of kaizen from the perspective of the commitment of the members of the case study organisation who are directly involved with the operations of the organisation.
Design/methodology/approach
The study applies a qualitative approach to explore the topic, engaging members of the case study organisation in the research to gather relevant data on the implementation of kaizen practices and the drive to attain resilience in the case study organisation. Semi-structured personal interviews and workshops were used for data collection. The study adopts systems theory to explore the topic, identifying and engaging relevant stakeholders.
Findings
Parts of the findings relating to kaizen are the issues with the livestock production process, aggressive leadership and the issue of livestock mortality in the case study organisation. These were discussed based on extant literature. The study affirms the importance of organisational members' commitment and adequate leadership support to achieve sustainable kaizen practices. The study highlights the need to align kaizen practices with relevant organisational practices, such as reward systems and contextual requirements for its implementation in an operational process. The study suggests that further study can focus on the dynamics of the legal system on the implementation of kaizen, especially from a developing economic background like Nigeria, where this study was conducted.
Originality/value
The study projects learning about the spatial factors that can affect the practices of kaizen in critical sectors like livestock management.
Details
Keywords
Mohamed M. Hendy and Magdy A. Ezzat
Whereas, the classical Green-Naghdi Type II (GN-II) model struggles to accurately represent the thermo-mechanical behavior of thermoelectric MHD due to its inability to account…
Abstract
Purpose
Whereas, the classical Green-Naghdi Type II (GN-II) model struggles to accurately represent the thermo-mechanical behavior of thermoelectric MHD due to its inability to account for the memory effect. A new mathematical model of the GN-II theory incorporates a fractional order of heat transport to address this issue.
Design/methodology/approach
The employment of the matrix exponential method, which forms the basis of the state-space approach in contemporary theory, is central to this strategy. The resulting formulation, together with the Laplace transform techniques, is applied to a variety of problems. Solutions to a thermal shock problem and to a problem of a layer media both without heat sources are obtained. Also, a problem with the distribution of heat sources is considered. The numerical technique is used to achieve the Laplace transform inversion.
Findings
According to the numerical results and its graphs, the influences of the fractional order parameters, figure-of-merit factor, thermoelectric power and Peltier coefficient on the behavior of the field quantities are investigated in the new theory.
Originality/value
The new modeling of thermoelectric MHD has advanced significantly as a result of this work, providing a more thorough and precise tool for forecasting the behavior of these materials under a range of thermal and magnetic conditions.
Details
Keywords
Paraskevi El Skarpa and Emmanouel Garoufallou
In the digital era individuals are overwhelmed by huge amount of readily available information. The information provided at the time of COVID-19 crisis is increasingly available…
Abstract
Purpose
In the digital era individuals are overwhelmed by huge amount of readily available information. The information provided at the time of COVID-19 crisis is increasingly available. The purpose of this paper was to investigate individuals’ perceived feelings due to the plethora of information during COVID-19 pandemic in Greece in Spring 2020.
Design/methodology/approach
This study was conducted through a Web-based questionnaire survey posted on the Google Forms platform. The questionnaire consisted of closed-ended, seven-point Likert-scale questions. The data collected were subjected to a principal component analysis. The retained principal components (PCs) were subjected to statistical analysis between genders and among age groups and professional status with the nonparametric criteria Mann–Whitney U and Kruskal–Wallis.
Findings
Responses by 776 individuals were obtained. Seventeen original variables from the questionnaire were summarized into three PCs that explained the 71.7% of total variance: “affective disorders,” “uncertainty issues and inaccurate information worries” and “satisfaction and optimism.” Participants partly agree that the received amount of information on the disease caused them feelings of uncertainty about the future and worries about relatives’ lives, but also satisfaction with developments in the country. Females seem to experience stronger perceived feelings of “affective disorders” (p < 0.001) and reported higher degree of agreement about “uncertainty issues and inaccurate information worries.”
Originality/value
The recorded feelings caused by the volume of available information may have forced people accept the necessary precautionary behavioral changes that had contributed to the Greek success in preventing spread of the disease in Spring 2020.
Details
Keywords
Zainab Al-Attar and Rachel Worthington
Clinically, it is often observed that autistic people may have a heightened need for rules and may find rule violations very distressing. It is clinically plausible that autistic…
Abstract
Purpose
Clinically, it is often observed that autistic people may have a heightened need for rules and may find rule violations very distressing. It is clinically plausible that autistic individuals may be prone to hyper-morality and greater reactivity and adverse experiences arising from moral threats and violations. Such adverse experiences may, in some instances, lead to moral distress (MD) or in more extreme cases moral injury. Thus, this study aims to examine how MD can operate in the context of autism.
Design/methodology/approach
The authors explore clinical hypotheses on how MD can intersect with different features of autism by drawing on clinical and research knowledge of autism spectrum disorder and how it contextualises experiences of morality.
Findings
Based on a review of the literature and theory, the authors hypothesise that autistic individuals may be more prone to MD where they have a lower threshold for MD. As a result of this lower threshold, they may have more frequent exposure to MD, experience more immediate and intense subjective reactions to moral transgressions, for more protracted periods. Also, they may find it more difficult to over-ride and neutralise moral outrage. As a result, they may be more susceptible to mental health sequelae and impaired social and occupational functioning. Practical recommendations are made for clinicians supporting people with autism with a propensity for MD or moral injury, to improve their quality of life.
Practical implications
Practical recommendations are made for clinicians supporting people with autism with a propensity for MD or moral injury, to improve their quality of life.
Originality/value
Understanding MD in an autistic context is important for detecting and treating the adverse impacts of MD on autistic individuals. Importantly, erroneous preconceptions about moral reasoning in autism need to be mitigated to fully understand the moral experiences and harness the many strengths of people with autism.
Details