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1 – 10 of over 2000
Article
Publication date: 5 October 2023

Kaikai Shi, Hanan Lu, Xizhen Song, Tianyu Pan, Zhe Yang, Jian Zhang and Qiushi Li

In a boundary layer ingestion (BLI) propulsion system, the fan operates continuously under distorted inflow conditions, leading to an increment of aerodynamic loss and in turn…

Abstract

Purpose

In a boundary layer ingestion (BLI) propulsion system, the fan operates continuously under distorted inflow conditions, leading to an increment of aerodynamic loss and in turn impacting the potential fuel burn reduction of the aircraft. Usually, in the preliminary design stage of a BLI propulsion system, it is essential to assess the impact of fuselage boundary layer fluids on fan aerodynamic performances under various flight conditions. However, the hub region flow loss is one of the major loss sources in a fan and would greatly influence the fan performances. Moreover, the inflow distortion also results in a complex and highly nonlinear mapping relation between loss and local physical parameters. It will diminish the prediction accuracy of the commonly used low-fidelity computational approaches which often incorporate traditional physics-based loss models, reducing the reliability of these approaches in evaluating fan performances. Meanwhile, the high-fidelity full-annulus unsteady Reynolds-averaged Navier–Stokes (URANS) approach, even though it can give rather accurate loss predictions, is extremely time-consuming. This study aims to develop a fast and accurate hub loss prediction method for a BLI fan under distorted inflow conditions.

Design/methodology/approach

This paper develops a data-driven hub loss prediction method for a BLI fan under distorted inflows. To improve the prediction accuracy and applicability, physical understandings of hub flow features are integrated into the modeling process. Then, the key physical parameters related to flow loss are screened by conducting a sensitivity analysis of influencing parameters. Next, a quasi-steady assumption of flow is made to generate a training sample database, reducing the computational time by acquiring one single sample from the highly time-consuming full-annulus URANS approach to a cost-efficient single-blade-passage approach. Finally, a radial basis function neural network is used to establish a surrogate model that correlates the input parameters and the output loss.

Findings

The data-driven hub loss model shows higher prediction accuracy than the traditional physics-based loss models. It can accurately capture the circumferentially and radially nonuniform variation trends of the losses and the associated absolute magnitudes in a BLI fan under different blade load, inlet distortion intensity and rotating speed conditions. Compared with the high-fidelity full-annulus URANS results, the averaged relative prediction errors of the data-driven hub loss model are kept less than 10%.

Originality/value

The originality of this paper lies in developing a new method for predicting flow loss in a BLI fan rotor blade hub region. This method offers higher prediction accuracy than the traditional loss models and lower computational time cost than the full-annulus URANS approach, which could realize fast evaluations of fan aerodynamic performances and provide technical support for designing high-performance BLI fans.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 34 no. 1
Type: Research Article
ISSN: 0961-5539

Keywords

Book part
Publication date: 19 March 2024

Catherine Sandoval and Patrick Lanthier

This chapter analyzes the link between the digital divide, infrastructure regulation, and disaster planning and relief through a case study of the flood in San Jose, California…

Abstract

This chapter analyzes the link between the digital divide, infrastructure regulation, and disaster planning and relief through a case study of the flood in San Jose, California triggered by the Anderson dam’s overtopping in February 2017 and an examination of communication failures during the 2018 wildfire in Paradise, California. This chapter theorizes that regulatory decisions construct social and disaster vulnerability. Rooted in the Whole Community approach to disaster planning and relief espoused by the United Nations and the Federal Emergency Management Agency, this chapter calls for leadership to end the digital divide. It highlights the imperative of understanding community information needs and argues for linking strategies to close the digital divide with infrastructure and emergency planning. As the Internet’s integration into society increases, the digital divide diminishes access to societal resources including disaster aid, and exacerbates wildfire, flood, pandemic, and other risks. To mitigate climate change, climate-induced disaster, protect access to social services and the economy, and safeguard democracy, it argues for digital inclusion strategies as a centerpiece of community-centered infrastructure regulation and disaster relief.

Details

Technology vs. Government: The Irresistible Force Meets the Immovable Object
Type: Book
ISBN: 978-1-83867-951-4

Keywords

Book part
Publication date: 10 April 2024

Ifzal Ahmad and M. Rezaul Islam

Abstract

Details

Building Strong Communities: Ethical Approaches to Inclusive Development
Type: Book
ISBN: 978-1-83549-175-1

Article
Publication date: 30 January 2024

Bohee So and Ki Han Kwon

This study, a narrative literature review, aims to examine the combined benefits of the active and passive use of social media (SM) for well-being (WB), physical and mental health…

Abstract

Purpose

This study, a narrative literature review, aims to examine the combined benefits of the active and passive use of social media (SM) for well-being (WB), physical and mental health during the COVID-19 pandemic.

Design/methodology/approach

A search strategy has been carried out in the databases: Riss, PubMed, Medline, Scopus and Google Scholar, including all the articles published until 19 October 2023.

Findings

SM offers various benefits, including global risk awareness, health information, social connections and support. With the natural increase in physical inactivity due to COVID-19 social restrictions, SM has been identified as an appropriate tool for promoting physical activity (PA) at home to improve health.

Research limitations/implications

It suggests that the combined use of active and passive benefits of SM could potentially play an important role in public health by increasing individuals’ health behaviours. In addition, dissemination, sharing and social interaction of information provided by YouTube can encourage healthy behaviours, contribute to WB, physical and mental health and raise public health awareness.

Originality/value

The findings presented in this study highlight the combined benefits of differentiating the features of SM use. Compared to other SM platforms, YouTube can be used as a useful tool for home-based PA that promotes health by enabling people to remain active and avoid barriers to PA due to social restrictions during the global crisis. In addition, some recommendations from the findings may help protect against potential risks and improve public health outcomes during global crises, such as the COVID-19 pandemic, among the general public using SM.

Details

Global Knowledge, Memory and Communication, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 2514-9342

Keywords

Book part
Publication date: 20 March 2024

Satlaj Dighe, John M. LaVelle, Paidamoyo Chikate, Meral Acikgoz, Padmavati Kannan, Doris Espelien and Trupti Sarode

Although educators would likely agree that values and ethics are important in all disciplines, they have particular importance for practice-oriented fields. These applied…

Abstract

Although educators would likely agree that values and ethics are important in all disciplines, they have particular importance for practice-oriented fields. These applied professionals need to solve complex social problems that require the application of ethical standards and value perspectives. While the importance of value-engaged practice is known to the applied field, there is little research and conversation about how values can be integrated into teaching. This chapter synthesizes values-education approaches in various practice-based disciplines such as public administration (PA), program evaluation, social work, and public health. This chapter draws from empirical and theoretical works as well as the authors' experiences developing, participating in, and conducting values-based research on professionals and professional education.

Open Access
Article
Publication date: 14 March 2024

Hassam Waheed, Peter J.R. Macaulay, Hamdan Amer Ali Al-Jaifi, Kelly-Ann Allen and Long She

In response to growing concerns over the negative consequences of Internet addiction on adolescents’ mental health, coupled with conflicting results in this literature stream…

Abstract

Purpose

In response to growing concerns over the negative consequences of Internet addiction on adolescents’ mental health, coupled with conflicting results in this literature stream, this meta-analysis sought to (1) examine the association between Internet addiction and depressive symptoms in adolescents, (2) examine the moderating role of Internet freedom across countries, and (3) examine the mediating role of excessive daytime sleepiness.

Design/methodology/approach

In total, 52 studies were analyzed using robust variance estimation and meta-analytic structural equation modeling.

Findings

There was a significant and moderate association between Internet addiction and depressive symptoms. Furthermore, Internet freedom did not explain heterogeneity in this literature stream before and after controlling for study quality and the percentage of female participants. In support of the displacement hypothesis, this study found that Internet addiction contributes to depressive symptoms through excessive daytime sleepiness (proportion mediated = 17.48%). As the evidence suggests, excessive daytime sleepiness displaces a host of activities beneficial for maintaining mental health. The results were subjected to a battery of robustness checks and the conclusions remain unchanged.

Practical implications

The results underscore the negative consequences of Internet addiction in adolescents. Addressing this issue would involve interventions that promote sleep hygiene and greater offline engagement with peers to alleviate depressive symptoms.

Originality/value

This study utilizes robust meta-analytic techniques to provide the most comprehensive examination of the association between Internet addiction and depressive symptoms in adolescents. The implications intersect with the shared interests of social scientists, health practitioners, and policy makers.

Details

Information Technology & People, vol. 37 no. 8
Type: Research Article
ISSN: 0959-3845

Keywords

Article
Publication date: 27 February 2024

Karina Villumsen, Hanne Elmer and Line Schmeltz

The COVID-19 lockdown severely impacted organizations in the cultural and tourist business as their products all of a sudden “disappeared”. This study aims to explore if and how…

Abstract

Purpose

The COVID-19 lockdown severely impacted organizations in the cultural and tourist business as their products all of a sudden “disappeared”. This study aims to explore if and how the unexpected and disruptive nature of the pandemic accelerated the development of new communication strategies on their social media.

Design/methodology/approach

The study draws on data from 24 midsize cultural institutions and tourist attractions in Denmark over the first two months of the lockdown in 2020. Approximately 900 posts on Facebook were collected and analyzed through the netnographic method. The analysis followed a two-layered qualitative approach. First, open coding to identify typologies and enable a comparison with established strategies from the literature review. Then, an exploratory examination was conducted across the typologies.

Findings

Nine different content categories were identified in the data and subsequently assessed and discussed in relation to the literature on strategies and dialogic intentions. This resulted in the emergence of two new overarching strategies: hope and host.

Practical implications

While hope is particularly relevant in crisis situations, the utilization of employees in the host role presents an opportunity for further development and engagement. Further, the results call for future research that breaks with the traditional quest for ideal strategies for the benefit of exploring the notion of “strategic doers”.

Originality/value

The identification of the hope and host strategies, along with the analysis of content categories and their alignment with various strategic intentions, contributes to the existing knowledge in this field. Further, the classic perception of engagement as driven by explicit interaction and dialogue is also challenged.

Details

Corporate Communications: An International Journal, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1356-3289

Keywords

Article
Publication date: 8 July 2022

Pallavi Chaturvedi, Kushagra Kulshreshtha, Vikas Tripathi and Durgesh Agnihotri

This study aims at analyzing the impact of green restaurants' sustainable practices (food safety, food sustainability practices, food quality, and environmental sensitivity) on…

2026

Abstract

Purpose

This study aims at analyzing the impact of green restaurants' sustainable practices (food safety, food sustainability practices, food quality, and environmental sensitivity) on consumer satisfaction and revisit intention.

Design/methodology/approach

A self-administered questionnaire was used to collect data from 417 participants who had recently experienced the services of leading green restaurants. The study draws upon the prevailing literature to test a series of research hypotheses through structural equation modeling.

Findings

The findings of the study have confirmed that sustainable practices such as food safety, food sustainability practices, environmental sensitivity, and food quality significantly influence consumers' satisfaction and revisit intentions. The willingness to pay has been found as a sensitive issue as it moderates the relationship between consumer satisfaction and revisit intention.

Practical implications

This study provides important insights for the businesses operating in foodservice industry. The study suggests important strategies to the restaurant business owners for improving their consumers' satisfaction and revisit intentions. These strategies may help foodservice businesses in building strong brand reputation and a competitive edge over others.

Originality/value

This study contributes to the food service literature by examining the restaurants' environmental legitimacy (food safety, food sustainability practices, food quality, and environmental sensitivity) from consumers' perspective. Moreover, the current study also fills the gap in literature by expanding the knowledge of consumers' pro-environmental behavior in the context of developing nations. Besides, to the best of the authors' knowledge, this is among very few studies, which have emphasized on analyzing consumer satisfaction and revisit intention based on their experience in a green restaurant on particular sustainable parameters.

Details

Asia-Pacific Journal of Business Administration, vol. 16 no. 1
Type: Research Article
ISSN: 1757-4323

Keywords

Article
Publication date: 6 February 2024

Wanyu Mou, S. Mostafa Rasoolimanesh and Stephanie Hui-Wen Chuah

As perceived corporate social responsibility (CSR) has become one of the long-term sustainable development strategies for many companies, this paper investigates the…

Abstract

Purpose

As perceived corporate social responsibility (CSR) has become one of the long-term sustainable development strategies for many companies, this paper investigates the interrelationships between sustainable values (SVs), perceived CSR and customer behaviour in the restaurant industry.

Design/methodology/approach

To gather data needed to meet the study aims, we conducted an online survey of restaurant patrons in China, and used partial least squares structural equation modelling (PLS-SEM) to analyse the proposed models and test the hypotheses.

Findings

The obtained findings confirm that the three studied SV dimensions (equality, respect for nature and shared responsibility) have positive effects on perceived CSR, which in turn significantly affects word of mouth (WOM). Moreover, perceived CSR mediates the relationship between the three SVs and WOM but has no impact on the relationship between SVs and revisit intention.

Practical implications

The results of this study have practical implications for managers in the restaurant industry. Restaurant managers can prioritize their CSR efforts based on the relative importance of SV dimensions, which is useful in generating positive WOM.

Originality/value

Even though the importance of CSR is widely recognised, it is insufficiently studied from the perspective of restaurant customers. This research not only addresses this gap, but also expands the current understanding of SVs and their impact on CSR.

Details

Journal of Hospitality and Tourism Insights, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 2514-9792

Keywords

Article
Publication date: 4 March 2024

Jianhua Zhang, Jiake Li, Sajjad Alam, Fredrick Ahenkora Boamah and Dandan Wen

This study examines the relationship between higher education improvement and tacit knowledge importance. In this context, the scarcity of empirical and theoretical studies on…

Abstract

Purpose

This study examines the relationship between higher education improvement and tacit knowledge importance. In this context, the scarcity of empirical and theoretical studies on acquiring tacit knowledge to enhance academic performance in higher education suggests that this research area holds significant importance for experts and policymakers. Consequently, this study aims to explore the factors that influence academic research performance at Chinese universities by acquiring tacit knowledge.

Design/methodology/approach

To achieve the study aims, the current approach utilizes the research technique based on the socialization, externalization, internalization and combination (SECI) model and knowledge management (KM) theory. To analyze the study objective, the authors collected data from post-graduate students at Chinese universities and analyzed it using structural equation modeling (SEM) to test the model and hypotheses.

Findings

The results indicated that social interaction, internalization and self-motivation have a positive impact on academic research performance through the acquisition of tacit knowledge. Furthermore, the findings suggest that academic researchers can acquire more knowledge through social interaction than self-motivation, thereby advancing research progress.

Originality/value

This study addresses the critical issues surrounding the acquisition of tacit knowledge and presents a comprehensive framework and achievements that can contribute to achieving exceptional academic performance.

Details

Kybernetes, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 0368-492X

Keywords

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