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- Valenti, S., et al.
(författare)
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SN 2009jf : a slow-evolving stripped-envelope core-collapse supernova
- 2011
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Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 416:4, s. 3138-3159
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Tidskriftsartikel (refereegranskat)abstract
- We present an extensive set of photometric and spectroscopic data for SN 2009jf, a nearby Type Ib supernova (SN), spanning from similar to 20 d before B-band maximum to 1 yr after maximum. We show that SN 2009jf is a slowly evolving and energetic stripped-envelope SN and is likely from a massive progenitor (25-30 M(circle dot)). The large progenitor's mass allows us to explain the complete hydrogen plus helium stripping without invoking the presence of a binary companion. The SN occurred close to a young cluster, in a crowded environment with ongoing star formation. The spectroscopic similarity with the He-poor Type Ic SN 2007gr suggests a common progenitor for some SNe Ib and Ic. The nebular spectra of SN 2009jf are consistent with an asymmetric explosion, with an off-centre dense core. We also find evidence that Herich Ib SNe have a rise time longer than other stripped-envelope SNe, however confirmation of this result and further observations are needed.
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- Bergström, Johan, et al.
(författare)
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Some Thoughts on How to Align the Theoretical Understanding of Team Performance with Resilience Engineering Theory
- 2014
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Ingår i: Resilience Engineering in Practice : Becoming Resilient - Becoming Resilient. - 9781317065234 - 9781472425157 ; 2
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Bokkapitel (refereegranskat)abstract
- Recent contributions to the field of Resilience Engineering (RE) have added to the continuous development of new concepts and methodologies to improve resilience at different organisational levels. Part of these contributions has focused on training for adaptive capacity of individuals and teams to cope with changes and disturbances of work, since literature recognise that working tasks (at least in complex settings) are not as stable as procedures, manuals and regulations might depict. It is becoming accepted that more is needed than training for recognition of pre-defined situations and application of corresponding procedures, that is, individuals and teams should be prepared by their training to also cope with unexpected situations. In previous volumes of RE contributions we have introduced new methods in order to address these unexpected situations (Bergström, Dahlström and Petersen, 2011; Dekker, Dahlström, van Winsen and Nyce, 2008). In this volume we will rather discuss the theoretical foundation of team training and the potential to align such a foundation with RE theory. Guided by two of the four cornerstones of RE(Hollnagel, 2011) our argument is that traditional approaches to sharp-end training should be reviewed, revised and readapted to concepts more aligned with RE thinking.
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- Sommer, G., et al.
(författare)
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Multiaxial mechanical properties and constitutive modeling of human adipose tissue : A basis for preoperative simulations in plastic and reconstructive surgery
- 2013
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Ingår i: Acta Biomaterialia. - : Elsevier BV. - 1742-7061 .- 1878-7568. ; 9:11, s. 9036-9048
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Tidskriftsartikel (refereegranskat)abstract
- A preoperative simulation of soft tissue deformations during plastic and reconstructive surgery is desirable to support the surgeon's planning and to improve surgical outcomes. The current development of constitutive adipose tissue models, for the implementation in multilayer computational frameworks for the simulation of human soft tissue deformations, has proved difficult because knowledge of the required mechanical parameters of fat tissue is limited. Therefore, for the first time, human abdominal adipose tissues were mechanically investigated by biaxial tensile and triaxial shear tests. The results of this study suggest that human abdominal adipose tissues under quasi-static and dynamic multiaxial loadings can be characterized as a nonlinear, anisotropic and viscoelastic soft biological material. The nonlinear and anisotropic features are consequences of the material's collagenous microstructure. The aligned collagenous septa observed in histological investigations causes the anisotropy of the tissue. A hyperelastic model used in this study was appropriate to represent the quasi-static multiaxial mechanical behavior of fat tissue. The constitutive parameters are intended to serve as a basis for soft tissue simulations using the finite element method, which is an apparent method for obtaining promising results in the field of plastic and reconstructive surgery.
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