Eldorado - Repositorium der TU Dortmund

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Bei diesem Service handelt es sich um das Institutionelle Repositorium der Technischen Universität Dortmund. Hier werden Ressourcen aus und für Lehre, Studium und Forschung gespeichert, erschlossen und der Öffentlichkeit zugänglich gemacht.

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Aktuellste Veröffentlichungen

Self‐transcendent leadership: a meta‐perspective
(Wiley, 2024-02-23) Theissen, Maximilian H.; Theissen, Hubertus H.; Gümüsay, Ali A.
Self-transcendence as a concept is increasingly found in leadership literature—yet in diverse ways. It is this diversity that serves as the motivation for the current article in which we develop a comprehensive and coherent conceptualization of self-transcendence for leadership research. We demonstrate that self-transcendence is the cognitive orientation of accepting something other than one's self to be of highest worth. We show that this something, which is greater than the self, may take four different forms: other people, social collectives, moral principles and ideals, or metaphysical beings. We contribute to leadership research by linking each greater something to one theory: servant, transformational, moral, and spiritual leadership. Our conceptualization of self-transcendence allows us to integrate different leadership theories into a meta-perspective of self-transcendent leadership. We conclude with implications for leadership research as well as practice.
Der Beobachter der Beobachter
(2026) Bigl, Benjamin
Sample size calculation under nonproportional hazards using average hazard ratios
(Wiley, 2024-08-12) Dormuth, Ina; Pauly, Markus; Rauch, Geraldine; Herrmann, Carolin
Many clinical trials assess time-to-event endpoints. To describe the difference between groups in terms of time to event, we often employ hazard ratios. However, the hazard ratio is only informative in the case of proportional hazards (PHs) over time. There exist many other effect measures that do not require PHs. One of them is the average hazard ratio (AHR). Its core idea is to utilize a time-dependent weighting function that accounts for time variation. Though propagated in methodological research papers, the AHR is rarely used in practice. To facilitate its application, we unfold approaches for sample size calculation of an AHR test. We assess the reliability of the sample size calculation by extensive simulation studies covering various survival and censoring distributions with proportional as well as nonproportional hazards (N-PHs). The findings suggest that a simulation-based sample size calculation approach can be useful for designing clinical trials with N-PHs. Using the AHR can result in increased statistical power to detect differences between groups with more efficient sample sizes.
Shape‐complementary multicomponent assembly of low‐symmetry Co(III)salphen‐based coordination cages
(Wiley, 2024-04-04) Zhang, Bo; Lee, Haeri; Holstein, Julian J.; Clever, Guido H.
While metal-mediated self-assembly is a popular technique to construct discrete nanosized objects, highly symmetric structures, built from one type of ligand at a time, are dominating reported systems. The tailored integration of a set of different ligands requires sophisticated approaches to avoid narcissistic separation or formation of statistical mixtures. Here, we demonstrate how the combination of three structure-guiding effects (metal-templated macrocyclization, additional bridging ligands and shape-complementarity) based on Co(III)salphen metal nodes allows for a rational and high-yielding synthesis of structurally complex, lantern-shaped cages with up to four differentiable bridges. Three new heteroleptic coordination cages based on dinuclear Co(III)salphen macrocycles were synthesized in a one-pot reaction approach and fully characterized, including single crystal X-ray analyses. One cage groups two of the same ligands, another two different ligands around a symmetric Co2-bis-salphen ring. In the most complex structure, this ring is unsymmetric, rendering all four connections between the two metal centers distinguishable. While heteroleptic assembly around Pd(II) nodes has been shown to be dynamic, beneficial for cage-to-cage transformations, assembly cascades and adaptive systems, the herein introduced cages based on kinetically more inert Co(III)salphen will be advantageous for applications in enzyme-like catalysis and molecular machinery that require enhanced structural and chemical stability.
Shape sensitivity analysis of history‐dependent materials for dynamic structures
(Wiley, 2024-12-30) Ghasemi, Seyed Ali; Barthold, Franz‐Joseph
This work presents a sensitivity analysis of inelastic material behavior within dynamic structures. The primary focus is on using the direct differentiation method to derive sensitivity matrices for displacement, velocity, acceleration, and history variables. These methods are validated through a detailed academic example.