Transformational Leadership and Life Satisfaction: The Mediating Role of Self-esteem and Subjective Experience of Work Success

Transformational leadership theory seems ideal for the South African context that is experiencing significant changes since the first democratic elections in 1994. Very little evidence is available regarding the role of self-esteem and success at work in the relationship between transformational leadership and life satisfaction, especially in South Africa. Data was collected in different organizations using cross-sectional design and a convenience sample (N = 616). The results suggest that all transformational leadership characteristics were significantly related to one another on the one hand and to self-esteem, subjective experiences of work success and life satisfaction on the other hand. A good fit of the data to the hypothesized model and closer inspection of the total, direct and indirect effects confirmed the partial mediation effect of self-esteem and subjective experiences of success at work in the relationship between transformational leadership and life satisfaction. Managerial implications and suggestions for future studies are provided

An adapted model of burnout for educators in South Africa

No Abstract Available South African Journal of Education Vol.25(2) 2005: 100-10

Accuracy versus precision in boosted top tagging with the ATLAS detector

Abstract The identification of top quark decays where the top quark has a large momentum transverse to the beam axis, known as top tagging, is a crucial component in many measurements of Standard Model processes and searches for beyond the Standard Model physics at the Large Hadron Collider. Machine learning techniques have improved the performance of top tagging algorithms, but the size of the systematic uncertainties for all proposed algorithms has not been systematically studied. This paper presents the performance of several machine learning based top tagging algorithms on a dataset constructed from simulated proton-proton collision events measured with the ATLAS detector at √ s = 13 TeV. The systematic uncertainties associated with these algorithms are estimated through an approximate procedure that is not meant to be used in a physics analysis, but is appropriate for the level of precision required for this study. The most performant algorithms are found to have the largest uncertainties, motivating the development of methods to reduce these uncertainties without compromising performance. To enable such efforts in the wider scientific community, the datasets used in this paper are made publicly available.</jats:p

Burnout and engagement in university students: A psychometric analysis of the MBI-SS and UWES-S

No Abstract. South African Journal of Higher Education Vol. 21 (1) 2007: pp.147-16

The Older the Better? The Role of Hope for the Regulation of Subjective Well-being over Life-span

Despite the increase of theoretical and empirical work on subjective well-being, research addressing the relation between hope and various dimensions of well-being from a life-span approach is still scarce. Based on original data of the Hope-Barometer 2015, this contribution aims at closing some research gaps by focussing on the question on how hope, well-being and age are related, and on how dispositional hope can predict life satisfaction, happiness and meaning in life and explain their variance. Results show a significant age-related increase for all well-being and dispositional hope parameters. Our data confirm furthermore the dominant role of hope for predicting meaning in life and life satisfaction over all age groups. Nonetheless, optimism also has a non-negligible impact on well-being outcomes, essentially for happiness and to a lesser extent for life satisfaction. These insights are not only scientific relevant, but entail important practical implications for designing interventions and psychological education

Search for the Zγ decay mode of new high-mass resonances in pp collisions at s = 13 TeV with the ATLAS detector

This letter presents a search for narrow, high-mass resonances in the Zγ final state with the Z boson decaying into a pair of electrons or muons. The TeV pp collision data were recorded by the ATLAS detector at the CERN Large Hadron Collider and have an integrated luminosity of 140 fb−1. The data are found to be in agreement with the Standard Model background expectation. Upper limits are set on the resonance production cross section times the decay branching ratio into Zγ. For spin-0 resonances produced via gluon–gluon fusion, the observed limits at 95% confidence level vary between 65.5 fb and 0.6 fb, while for spin-2 resonances produced via gluon–gluon fusion (or quark–antiquark initial states) limits vary between 77.4 (76.1) fb and 0.6 (0.5) fb, for the mass range from 220 GeV to 3400 GeV