Risk governance in organizations

Dieses Buch dokumentiert 10 Jahre Risk-Governance-Forschung an der Universität Siegen. In 50 Beiträgen reflektieren Forscher und Praktiker Risk Governance vor dem Hintergrund ihrer eigenen Forschungen und/oder Erfahrungen und geben jeweils einen Entwicklungsimpuls für die Zukunft der Risk Governance. Das Buch zeigt die große Bandbreite und Tiefe des Forschungsgebietes auf und diskutiert Grundannahmen, Implementierungsfragen, die Rolle der Risk Governance als Transformationsmotor, ihre Wirkung in den verschiedenen betrieblichen Funktionen, Entwicklungsperspektiven und den Beitrag der Risk Governance zu einer nachhaltigen Ausrichtung von Unternehmen.This book documents 10 years of risk governance research at the University of Siegen. In 50 contributions, researchers and practitioners reflect on risk governance against the background of their own research and/or experience and provide a development impetus for the future of risk governance. The book shows the wide range and depth of the research field and discusses basic assumptions, implementation issues, the role of risk governance as transformation engine, its impact in the various operational functions, development perspectives, and the contribution of risk governance to a sustainable orientation of companies

Either accurate singlet-triplet gaps or excited-state structures: Testing and understanding the performance of TD-DFT for TADF emitters

The energy gap between the lowest singlet S1 and triplet T1 excited states ∆EST is a key property for thermally-activated delayed fluorescence (TADF) emitters. Time-dependent density functional theory (TD-DFT) is widely used to predict this gap and study TADF in general, despite its well-known shortcomings concerning charge-transfer (CT) states. Furthermore, polar CT states strongly interact with their environment, whose treatment is another issue when in quantum-chemical excited-state methods. Addressing these two major challenges, this work explores the performance of Tamm-Dancoff-approximated (TDA)-DFT for the calculation of a large set of ∆EST values included in the recent STGABS27 benchmark set. To this end, we employ a wide range of approaches to include orbital relaxation, environmental effects, and structural relaxation. Surprisingly, the best-performing approach for the specific task of predicting ∆EST heavily relies on error cancellation to mimic environmental and orbital-relaxation effects, using functionals with a low amount of Fock exchange of ≈ 10 % (e.g., TPSSh) in combination with ground-state structures. Generally, however, this approach is not very useful as it provides systematically wrong excitation energies, excited-state structures and state characters. To some extent, similar issues are observed with all studied TDA-DFT approaches. We thus conclude that for the description of CT states in dielectric environments, TDA-DFT is not competitive with the recently presented ROKS/PCM approach regarding robustness, accuracy, and computational efficiency