ORCID Profile
0000-0002-3358-5258
Current Organisations
Copenhagen Business School
,
University of Sydney
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Publisher: SAGE Publications
Date: 27-12-2013
Abstract: Upper echelons research has largely focused on the antecedents and consequences of top management teams (TMTs) from the team and firm levels of analysis. This paper reviews empirical research on TMTs with a specific emphasis on the role of the external environment. Applying institutional and industrial organization theories, a cross-level conceptual model outlining the direct, mediating, and moderating effects of the external environment on upper echelons is developed. This review distinguishes between industry and institutional levels of analysis and three types of environmental characteristics: stable, dynamic, and transformational. The paper further explains the relationships between each category of characteristics and firm upper echelons, and outlines possible avenues for future research.
Publisher: Academy of Management
Date: 08-2008
Publisher: Routledge
Date: 19-11-2008
Publisher: Oxford University Press (OUP)
Date: 25-05-2020
Abstract: We present DES16C3cje, a low-luminosity, long-lived type II supernova (SN II) at redshift 0.0618, detected by the Dark Energy Survey (DES). DES16C3cje is a unique SN. The spectra are characterized by extremely narrow photospheric lines corresponding to very low expansion velocities of ≲1500 km s−1, and the light curve shows an initial peak that fades after 50 d before slowly rebrightening over a further 100 d to reach an absolute brightness of Mr ∼ −15.5 mag. The decline rate of the late-time light curve is then slower than that expected from the powering by radioactive decay of 56Co, but is comparable to that expected from accretion power. Comparing the bolometric light curve with hydrodynamical models, we find that DES16C3cje can be explained by either (i) a low explosion energy (0.11 foe) and relatively large 56Ni production of 0.075 M⊙ from an ∼15 M⊙ red supergiant progenitor typical of other SNe II, or (ii) a relatively compact ∼40 M⊙ star, explosion energy of 1 foe, and 0.08 M⊙ of 56Ni. Both scenarios require additional energy input to explain the late-time light curve, which is consistent with fallback accretion at a rate of ∼0.5 × 10−8 M⊙ s−1.
Publisher: SAGE Publications Ltd
Date: 2012
Publisher: Oxford University Press (OUP)
Date: 13-04-2020
Abstract: We present an analysis of DES17X1boj and DES16E2bjy, two peculiar transients discovered by the Dark Energy Survey (DES). They exhibit nearly identical double-peaked light curves that reach very different maximum luminosities (Mr = −15.4 and −17.9, respectively). The light-curve evolution of these events is highly atypical and has not been reported before. The transients are found in different host environments: DES17X1boj was found near the nucleus of a spiral galaxy, while DES16E2bjy is located in the outskirts of a passive red galaxy. Early photometric data are well fitted with a blackbody and the resulting moderate photospheric expansion velocities (1800 km s−1 for DES17X1boj and 4800 km s−1 for DES16E2bjy) suggest an explosive or eruptive origin. Additionally, a feature identified as high-velocity Ca ii absorption ($v$ ≈ 9400 km s−1) in the near-peak spectrum of DES17X1boj may imply that it is a supernova. While similar light-curve evolution suggests a similar physical origin for these two transients, we are not able to identify or characterize the progenitors.
Publisher: SAGE Publications
Date: 08-2010
Abstract: The number of foreigners appointed to top management teams has increased significantly over the past decade. However, the question of why some firms elect to employ foreign nationals in top executive positions remains unclear. This study tests competing explanations based on strategic fit, human capital and attraction—selection—attrition perspectives. Results from empirical tests utilizing a multi-level methodology on a s le of Swiss publicly listed companies suggest that degree of international ersification is positively associated with the likelihood of having a foreign executive, whereas human capital characteristics do not explain the propensity to employ a foreigner on the top management team. In addition, nationality ersity at the board level, as well as the international experience of the top management team, predict the probability of having a foreign top executive.
Publisher: Emerald Group Publishing Limited
Date: 02-09-2010
Publisher: Informa UK Limited
Date: 2012
Publisher: Elsevier BV
Date: 09-2017
Publisher: American Astronomical Society
Date: 18-11-2020
Publisher: Academy of Management
Date: 2016
Publisher: Wiley
Date: 03-2010
Publisher: Edward Elgar Publishing
Date: 28-02-2023
Publisher: Academy of Management
Date: 08-2008
Publisher: Virtus Interpress
Date: 2008
DOI: 10.22495/COCV5I3C1P5
Abstract: This paper explores the substitution effects among three governance mechanisms, board monitoring potential, incentives and ownership structure, in a s le of 176 publicly listed companies in Switzerland, a country characterised by bank-centred governance system and high degree of ownership concentration. Our results suggest that whereas ownership concentration per se does not substitute for monitoring by the board, shareholdings held by board and top management and presence of a shareholder on the board act as substitutes for board independence. Moreover, we found that substitution effects differ with the identity of the largest shareholder. Firms owned by financial institutions exhibit a negative relationship between board independence and shareholder representation on board, whereas in family controlled firms board and managerial ownership is the main substitute for board monitoring.
Publisher: Wiley
Date: 03-2010
DOI: 10.1057/EMR.2009.27
Publisher: Elsevier BV
Date: 06-2009
Publisher: Wiley
Date: 02-08-2010
Publisher: Elsevier BV
Date: 04-2011
Publisher: Wiley
Date: 15-10-2012
DOI: 10.1002/SMJ.2021
Publisher: Springer Science and Business Media LLC
Date: 20-03-2010
Publisher: Oxford University Press (OUP)
Date: 17-08-2020
Abstract: Rapidly evolving transients (RETs), also termed fast blue optical transients, are a recently discovered group of astrophysical events that display rapid luminosity evolution. RETs typically rise to peak in less than 10 d and fade within 30, a time-scale unlikely to be compatible with the decay of Nickel-56 that drives conventional supernovae (SNe). Their peak luminosity spans a range of −15 & Mg & −22.5, with some events observed at redshifts greater than 1. Their evolution on fast time-scales has hindered high-quality follow-up observations, and thus their origin and explosion/emission mechanism remains unexplained. In this paper, we present the largest s le of RETs to date, comprising 106 objects discovered by the Dark Energy Survey, and perform the most comprehensive analysis of RET host galaxies. Using deep-stacked photometry and emission lines from OzDES spectroscopy, we derive stellar masses and star formation rates (SFRs) for 49 host galaxies, and metallicities ([O/H]) for 37. We find that RETs explode exclusively in star-forming galaxies and are thus likely associated with massive stars. Comparing RET hosts to s les of host galaxies of other explosive transients as well as field galaxies, we find that RETs prefer galaxies with high specific SFRs (〈log (sSFR)〉 ∼ −9.6), indicating a link to young stellar populations, similar to stripped-envelope SNe. RET hosts appear to show a lack of chemical enrichment, their metallicities akin to long-duration gamma-ray bursts and superluminous SN host galaxies (〈12 + log (O/H)〉 ∼ 9.4). There are no clear relationships between mass or SFR of the host galaxies and the peak magnitudes or decline rates of the transients themselves.
Publisher: SAGE Publications
Date: 08-2009
Abstract: While in idual-level social psychological processes may promote top management team (TMT) homogeneity, a number of organizational and environmental factors pose requirements for increasing TMT heterogeneity. These opposing mechanisms lead to different predictions regarding the outcome of the TMT selection process. This article investigates the interactions between the different level factors influencing TMT heterogeneity in order to determine under what conditions pressures towards heterogeneity prevail over the tendency towards homosocial reproduction. Based on a panel dataset of 165 Swiss listed companies, the results of hierarchical linear model (HLM) analyses provide support for attraction—selection—attrition (ASA) and similarity— attraction tendencies. Newly appointed TMT members were more likely to be similar to the rest of the team when the prior degree of homogeneity in the TMT was high. However, this tendency was lower in firms with a high degree of internationalization or facing dynamic industry environments. At the same time, munificent industries lify tendencies towards TMT homogeneity.
Publisher: Wiley
Date: 22-07-2009
Publisher: Springer Science and Business Media LLC
Date: 05-2006
Publisher: Edward Elgar Publishing
Date: 28-02-2023
Publisher: Wiley
Date: 04-01-2011
DOI: 10.1002/JOB.743
Publisher: Springer Science and Business Media LLC
Date: 08-01-2009
Publisher: Wiley
Date: 07-2007
Publisher: Edward Elgar Publishing
Date: 28-02-2023
Publisher: Elsevier BV
Date: 02-2016
No related grants have been discovered for Sabina Nielsen.