Barry University

About: Barry University is a education organization based out in Miami, Florida, United States. It is known for research contribution in the topics: Population & Social work. The organization has 645 authors who have published 1119 publications receiving 17494 citations.

The MLQ revisited: psychometric properties and recommendations

Abstract: The Multifactor Leadership Questionnaire (MLQ) is one of the most widely used instruments to measure transformational and transactional leader behaviors in the organizational sciences. A review of this literature reveals inconsistent research findings, which may be due to the psychometric properties of the MLQ. Data from four samples of managers were employed to investigate the underlying factor structure of the MLQ. In independent samples, the data fail to support the hypothesized structure of the MLQ in first- and second-order confirmatory factor analyses (CFA). However, a reduced set of items from the MLQ appear to show preliminary evidence of construct and predictive validity. Implications for future research and theoretical development are discussed.

Revisiting the Bound on Axion-Photon Coupling from Globular Clusters

Abstract: We derive a strong bound on the axion-photon coupling ${g}_{a\ensuremath{\gamma}}$ from the analysis of a sample of 39 Galactic Globular Clusters. As recognized long ago, the $R$ parameter, i.e., the number ratio of stars in horizontal over red giant branch of old stellar clusters, would be reduced by the axion production from photon conversions occurring in stellar cores. In this regard, we have compared the measured $R$ with state-of-the-art stellar models obtained under different assumptions for ${g}_{a\ensuremath{\gamma}}$. We show that the estimated value of ${g}_{a\ensuremath{\gamma}}$ substantially depends on the adopted He mass fraction $Y$, an effect often neglected in previous investigations. Taking as a benchmark for our study the most recent determinations of the He abundance in H ii regions with $\mathrm{O}/\mathrm{H}$ in the same range of the Galactic Globular Clusters, we obtain an upper bound ${g}_{a\ensuremath{\gamma}}l0.66\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}10}\text{ }\text{ }{\mathrm{GeV}}^{\ensuremath{-}1}$ at 95% confidence level. This result significantly improves the constraints from previous analyses and is currently the strongest limit on the axion-photon coupling in a wide mass range.

Revisiting the SN1987A gamma-ray limit on ultralight axion-like particles

Abstract: We revise the bound from the supernova SN1987A on the coupling of ultralight axion-like particles (ALPs) to photons. In a core-collapse supernova, ALPs would be emitted via the Primakoff process, and eventually convert into gamma rays in the magnetic field of the Milky Way. The lack of a gamma-ray signal in the GRS instrument of the SMM satellite in coincidence with the observation of the neutrinos emitted from SN1987A therefore provides a strong bound on their coupling to photons. Due to the large uncertainty associated with the current bound, we revise this argument, based on state-of-the-art physical inputs both for the supernova models and for the Milky-Way magnetic field. Furthermore, we provide major amendments, such as the consistent treatment of nucleon-degeneracy effects and of the reduction of the nuclear masses in the hot and dense nuclear medium of the supernova. With these improvements, we obtain a new upper limit on the photon-ALP coupling: gaγ 5.3 × 10-12 GeV-1, for ma 4.4 × 10-10 eV, and we also give its dependence at larger ALP masses ma. Moreover, we discuss how much the Fermi-LAT satellite experiment could improve this bound, should a close-enough supernova explode in the near future.

Downsizing in a Learning Organization: Are There Hidden Costs?

Abstract: Business practice has been at odds with organizational theory: whereas one managerial “fashion”—downsizing—involves divestiture of human assets, another—learning—advocates investment in human assets. We use a social network frame to consider the impact of downsizing on organizational learning and propose that the effects can be viewed as a nonlinear function of learning network size. From this perspective the potential damage to a firm's learning capacity is greater than head-count ratios imply.

Beyond the 'east-west' dichotomy: Global variation in cultural models of selfhood.

Abstract: Markus and Kitayama’s (1991) theory of independent and interdependent self-construals had a major influence on social, personality, and developmental psychology by highlighting the role of culture in psychological processes. However, research has relied excessively on contrasts between North American and East Asian samples, and commonly used self-report measures of independence and interdependence frequently fail to show predicted cultural differences. We revisited the conceptualization and measurement of independent and interdependent self-construals in 2 large-scale multinational surveys, using improved methods for cross-cultural research. We developed (Study 1: N = 2924 students in 16 nations) and validated across cultures (Study 2: N = 7279 adults from 55 cultural groups in 33 nations) a new 7-dimensional model of self-reported ways of being independent or interdependent. Patterns of global variation support some of Markus and Kitayama’s predictions, but a simple contrast between independence and interdependence does not adequately capture the diverse models of selfhood that prevail in different world regions. Cultural groups emphasize different ways of being both independent and interdependent, depending on individualism-collectivism, national socioeconomic development, and religious heritage. Our 7-dimensional model will allow future researchers to test more accurately the implications of cultural models of selfhood for psychological processes in diverse ecocultural contexts. (PsycINFO Database Record (c) 2016 APA, all rights reserved)