Reversible Self-Actuated Thermo-Responsive Pore Membrane.

Smart membranes, which can selectively control the transfer of light, air, humidity and temperature, are important to achieve indoor climate regulation. Even though reversible self-actuation of smart membranes is desirable in large-scale, reversible self-regulation remains challenging. Specifically, reversible 100% opening/closing of pore actuation showing accurate responsiveness, reproducibility and structural flexibility, including uniform structure assembly, is currently very difficult. Here, we report a reversible, thermo-responsive self-activated pore membrane that achieves opening and closing of pores. The reversible, self-actuated thermo-responsive pore membrane was fabricated with hybrid materials of poly (N-isopropylacrylamide), (PNIPAM) within polytetrafluoroethylene (PTFE) to form a multi-dimensional pore array. Using Multiphysics simulation of heat transfer and structural mechanics based on finite element analysis, we demonstrated that pore opening and closing dynamics can be self-activated at environmentally relevant temperatures. Temperature cycle characterizations of the pore structure revealed 100% opening ratio at T = 40 °C and 0% opening ratio at T = 20 °C. The flexibility of the membrane showed an accurate temperature-responsive function at a maximum bending angle of 45°. Addressing the importance of self-regulation, this reversible self-actuated thermo-responsive pore membrane will advance the development of future large-scale smart membranes needed for sustainable indoor climate control

Entrepreneurial passion: A systematic review and research opportunities

In this paper, we conduct a systematic review on the topic of entrepreneurial passion. We summarize the empirical findings of studies based on the four major conceptualizations of passion: passion for work, the dualistic model of passion, entrepreneurial passion, and perceived passion. Moreover, we analyze 63 published papers in the literature and identify potential research opportunities in this area. First, research on the relationship between entrepreneurial passion and firm performance needs further examination; we need comprehensive and more nuanced studies on this relationship, focusing on diverse types of passion. Second, distinctive mechanisms based on different types of passion would enhance our understanding of how passion influences firm performance and other outcomes. Third, it is essential that future studies carefully match theoretical arguments and measurements, based on the frameworks of passion. Fourth, scholars should conduct empirical research on entrepreneurial passion in various cultural contexts. Fifth, theoretical justifications and contextual appropriateness for each framework of passion are critical to advance the literature. Lastly, scholars need to utilize unified terminologies of passion

Organizational Culture and Entrepreneurial Orientation: An Orthogonal Perspective of Individualism and Collectivism

This study contributes to the existing literature regarding the relationship between culture and entrepreneurship. Building upon the precepts of institutional theory, we examine the influence of organisational culture on firm-level entrepreneurial orientation. While entrepreneurship researchers have emphasised the importance of entrepreneurial orientation for firms, the influence of organisational culture in supporting the incidence of entrepreneurial orientation has not been adequately studied. In an effort to contribute to this emergent area of inquiry, we consider the role of two key dimensions of organisational culture − individualism and collectivism – in facilitating entrepreneurial orientation. In doing so, we illustrate the utility of adopting an orthogonal conceptualisation of these cultural dimensions rather than the commonly held unidimensional formulation. We use polynomial regression and response surface methodology to investigate the effects of both dimensions of organisational culture on entrepreneurial orientation. Using Korea as the main context of the study, we support our hypotheses using data collected from 406 Korean small- and medium-sized enterprises

Guest Editorial : New Trends in Entrepreneurship: A Global Context

When management guru Peter Drucker wrote about entrepreneurship in 1984 (Drucker, 1984), entrepreneurial activities were primarily perceived as an American phenomenon. Today, entrepreneurship has spurred globally, from developed countries to emerging economies, thanks to accelerated globalization, integration of people and cultures, and rapid technological innovation. While Drucker’s focus on entrepreneurial decisions in the late 1980s was mainly about established corporations, millions of empowered individual entrepreneurs are increasingly recognized as the backbone of the global economy (Khanna, 2007). Thomas Friedman once described this stage of globalization as globalization 4.0, which features empowered entrepreneurial individuals (Friedman, 2005). New technology, especially information and communication technology, enables new business creation every day around the world (World Bank, 2022). In today’s global economy, entrepreneurs have an opportunity to interact with the global world more than ever before. Even if the target marrket is local, competition could come from anywhere in the world (Dawar and Frost, 1999)

Transitional Entrepreneurship: Unleashing Entrepreneurial Potential Across Numerous Challenging Contexts

Transitional entrepreneurship refers to the practices of entrepreneurs from communities facing adversity who navigate substantial life transitions as they launch and manage new ventures in response to various changes and challenges in their environment. Entrepreneurship is not only a critical driver of economic growth and social development (Ahlstrom et al., 2019; McCloskey, 2010) but can also represent a life-changing transition for most, if not all, of the entrepreneurs themselves. Transitional entrepreneurship entails strategic pivots or transformations that enable entrepreneurs to adapt and thrive in evolving circumstances. In this regard, transitional entrepreneurship research focuses on entrepreneurs from veterans, minorities, immigrants, refugees, women, historically marginalized groups and economically distressed communities. The major goal of this special issue is to draw attention to the endeavors of entrepreneurs from these communities and to pull together some of the disparate research on the important topic of transitional entrepreneurship

Fabrication of polyimide nanotubes and carbon nanotubes containing magnetic iron oxide in confinement

Polyimide nanotubes with tunable wall thickness were fabricated by a precursor impregnation method using an AAO template, and carbon nanotubes containing magnetic iron oxide were obtained using ferric chloride-embedded polyimide precursor by a carbonization process.This work was supported by Korea Science and Engineering Foundation through the Hyperstructured Organic Materials Research Center

Twenty-five years of New England Journal of Entrepreneurship: a bibliometric review

Purpose – In 2023, the New England Journal of Entrepreneurship (NEJE) reached its 25th anniversary. To commemorate this major milestone as well as entrepreneurship’s growth as an academic field, the study employs bibliometric methods to provide key trends and research suggestions for entrepreneurship scholars using all original research published in the journal. Design/methodology/approach – The authors perform two predominant bibliometric techniques, performance analysis and science mapping, using all 251 articles published by NEJE from 1998 to 2022. Findings – The authors find that the impact of entrepreneurship research published at NEJE is growing consistently and that the challenge of the future will be to maintain this growth in tandem with greater publication productivity. The authors also find that although most contributions come from authors affiliated with institutions in the USA, there is a global representation from authors who have published in NEJE. Further, the authors found that the major entrepreneurship research themes of articles published in NEJE revolve around general entrepreneurship, entrepreneurial behavior, gender, technology, entrepreneurship education, innovation and value creation and sustainability. Research limitations/implications – The analysis is restricted to articles published in NEJE and therefore may not be representative of the entrepreneurship field. However, it can serve as a useful resource, particularly for prospective NEJE authors, to gain empirical insights about entrepreneurship research trends and rising topics of interest. Originality/value – The authors’ work represents the first effort to synthesize research published in NEJE through bibliometric techniques and offers insights about important trends and themes in this rising outlet of the entrepreneurship field

Search for the Sagittarius Tidal Stream of Axion Dark Matter around 4.55 μ\mueV

We report the first search for the Sagittarius tidal stream of axion dark matter around 4.55 $\mu$eV using CAPP-12TB haloscope data acquired in March of 2022. Our result excluded the Sagittarius tidal stream of Dine-Fischler-Srednicki-Zhitnitskii and Kim-Shifman-Vainshtein-Zakharov axion dark matter densities of $\rho_a\gtrsim0.184$ and $\gtrsim0.025$ GeV/cm$^{3}$, respectively, over a mass range from 4.51 to 4.59 $\mu$eV at a 90% confidence level.Comment: 6 pages, 7 Figures, PRD Letter accepte

Extensive search for axion dark matter over 1\,GHz with CAPP's Main Axion eXperiment

We report an extensive high-sensitivity search for axion dark matter above 1\,GHz at the Center for Axion and Precision Physics Research (CAPP). The cavity resonant search, exploiting the coupling between axions and photons, explored the frequency (mass) range of 1.025\,GHz (4.24\,$\mu$eV) to 1.185\,GHz (4.91\,$\mu$eV). We have introduced a number of innovations in this field, demonstrating the practical approach of optimizing all the relevant parameters of axion haloscopes, extending presently available technology. The CAPP 12\,T magnet with an aperture of 320\,mm made of Nb$_3$Sn and NbTi superconductors surrounding a 37-liter ultralight-weight copper cavity is expected to convert DFSZ axions into approximately $10^2$ microwave photons per second. A powerful dilution refrigerator, capable of keeping the core system below 40\,mK, combined with quantum-noise limited readout electronics, achieved a total system noise of about 200\,mK or below, which corresponds to a background of roughly $4\times 10^3$ photons per second within the axion bandwidth. The combination of all those improvements provides unprecedented search performance, imposing the most stringent exclusion limits on axion--photon coupling in this frequency range to date. These results also suggest an experimental capability suitable for highly-sensitive searches for axion dark matter above 1\,GHz.Comment: A detailed axion dark matter article with 27 pages, 22 figure