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Circular economy firms, unlike those in a linear economy, encounter significant challenges due to the nature of nonstandardized products, such as asymmetric information on product specifications and highly dispersed supply and demand. Consequently, achieving large-scale operations becomes inherently difficult for them. However, when digital platform-based circular firms adopt diversified business models, their value creation has the potential to achieve significant scale. This study aims to answer “How do digital platform-based circular firms scale up value creation through business model diversification?”.

The authors use a qualitative case study design with a longitudinal (2011–2023) analysis of the various business models developed by ATRenew, a leading firm in the Chinese preowned electronics industry.

The authors find that the recycling business model can act as a “cornerstone” business model for a circular firm to integrate the business model portfolio by leveraging the most synergies (or complementarities) with other business models. Besides, digital platform-based circular firms can effectively scale up value creation by leveraging capability complementary on the supply side, through establishing industrial infrastructure shared with the platform ecosystem; and by leveraging customer complementary on the demand side, through activating the dual role played by platform users as suppliers and consumers.

The authors contribute to the circular business models literature with three mechanisms to scale up circular value creation through business model diversification and advance a set of propositions to be tested in future research. This also has important practical implications for circular economy platform businesses.

Carbon emission is one of the most important problems of today. In this framework, it is important for countries to take the necessary actions to solve this problem. Energy use is one of the most important causes of carbon emissions. Choosing fossil fuels in this process increases the carbon emission problem. Therefore, it is understood that countries should be more sensitive about energy types. In this context, renewable energy (RE) sources are recommended by experts. However, due to some problems of these energy types, it does not seem possible to meet all energy needs from these sources. It is thought that nuclear energy will produce a permanent solution to the carbon emission problem. In this context, it is recommended that the use of nuclear energy be put on the agenda by countries.

The paper aimed to explore the underlying work engagement role in transformational leadership and employees' job performance relationships. Moreover, this study also looked at the moderation of leaders' managerial skills in the transformational leadership and work engagement nexus.

The time-lagged data of 360 followers — leader dyads nested in 71 teams were collected from star-rated hotels in Italy and structural equation modeling (SEM) analysis was executed.

Based on social learning theory and idiosyncrasy credit theory, the SEM results demonstrate that transformational leadership is significantly and positively linked with job performance and work engagement mediated this relationship. The results also confirmed that leaders' managerial skills strengthen the transformational leadership and work engagement nexus.

Hotel managers should consider hiring individuals with transformational leadership skills and provide training to Polish their managerial skills in order to enhance employee engagement at work, which may result in job performance.

With this study, the researchers emphasize the significance of transformational leadership and work engagement for better job performance in the Italian hospitality industry. Our analysis also provides new evidence that leaders' managerial skills strengthen the transformative leadership and work engagement nexus. The study is one of the first to investigate the boundary conditions of leaders' managerial skills in the transformational leadership and work engagement relationship. Based on the findings, the practical and theoretical contributions are also discussed.

With aims to increase the aerodynamic efficiency of aerodynamic surfaces, study on flow control over these surfaces has gained importance. With the addition of flow control devices such as synthetic jets and vortex generators, the flow characteristics can be modified over the surface and, at the same time, enhance the performance of the body. One such flow control device is the tubercle. Inspired by the humpback whale’s flippers, these leading-edge serrations have improved the aerodynamic efficiency and the lift characteristics of airfoils and wings. This paper aims to discusses in detail the flow physics associated with tubercles and their effect on swept wings.

This study involves a series of experimental and numerical analyses that have been performed on four different wing configurations, with four different sweep angles corresponding to 0°, 10°, 20° and 30° at a low Reynolds number corresponding to Re_c=100,000.

Results indicate that the effect of tubercles diminishes with an increase in wing sweep. A significant performance enhancement was observed in the stall and post-stall regions. The addition of tubercles led to a smooth post-stall lift characteristic compared to the sudden loss in the lift with regular wings. Among the four different wings under observation, it was found that tubercles were most effective on the 0° configuration (no sweep), showing a 10.8% increment in maximum lift and a 38.5% increase in the average lift generated in the post-stall region. Tubercles were least effective on 30° configuration. Furthermore, with an increase in wing sweep, co-rotating vortices were distinctly observed rather than counter-rotating vortices.

While extensive numerical and experimental studies have been performed on straight wings with tubercles, studies on the tubercle effect on swept wings at low Reynolds number are minimal and mainly experimental in nature. This study uses numerical methods to explore the complex flow physics associated with tubercles and their implementation on swept wings. This study can be used as an introductory study to implement passive flow control devices in the low Reynolds number regime.