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Who wants to learn harder? The relationship between conservatism and liberalism, desirable difficulties, and academic learning
(2022-01-04)
Previous work has shown that challenging learning strategies like desirable difficulties improve long-term learning. Nonetheless, because they might be regarded as strict and demanding learning strategies, they should not be perceived as positive by everyone. They should, however, fit conservative political attitudes since those are, among others, positively correlated with individuals’ need for order and structure as well as with challenging learning environments. Hence, we hypothesized conservative political attitudes ...
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Bonding Behaviour of Steel Fibres in UHPFRC Based on Alkali-Activated Slag
(2022-03-04)
The mechanical performance of fibre-reinforced ultra-high-performance concrete based on alkali-activated slag was investigated, concentrating on the use of steel fibres. The flexural strength is slightly higher compared to the UHPC based on Ordinary Portland Cement (OPC) as the binder. Correlating the flexural strength test with multiple fibre-pullout tests, an increase in the bonding behaviour at the interfacial-transition zone of the AAM-UHPC was found compared to the OPC-UHPC. Microstructural investigations on the ...
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Dissolution of Portlandite in Pure Water: Part 1 Molecular Dynamics (MD) Approach
(2022-02-14)
The current contribution proposes a multi-scale bridging modeling approach for the dissolution of crystals to connect the atomistic scale to the (sub-) micro-scale. This is demonstrated in the example of dissolution of portlandite, as a relatively simple benchmarking example for cementitious materials. Moreover, dissolution kinetics is also important for other industrial processes, e.g., acid gas absorption and pH control. In this work, the biased molecular dynamics (metadynamics) coupled with reactive force field ...
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Transmission Electron Microscopy Study on the Precipitation Behaviors of Laser-Welded Ferritic Stainless Steels and Their Implications on Intergranular Corrosion Resistance
(2022-01-04)
The intergranular corrosion susceptibility of ferritic stainless-steel weldments is strongly dependent on chromium carbide precipitation phenomena. Hence, stabilization is widely used to mitigate the aforementioned precipitation. In contrast, stabilization has proved ineffective to fully prevent intergranular corrosion due to segregation of unreacted chromium during solid-state heat-treatments. To analyze the precipitation behavior of 17 wt.-% chromium ferritic stainless steels during laser welding, sheets of ...
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Welchen Herausforderungen begegnen Kreativdirektor/innen in Werbeagenturen? Exploration einer neuen Zielgruppe für Beratung
(2022-03-18)
Obwohl creative leadership zu den buzzwords der letzten Jahre gehörte, sind Kreativdirektor/innen in Werbeagenturen von der Wissenschaft in Deutschland bislang unbeachtet geblieben. Die vorliegende qualitative Untersuchung hat im Rahmen von sechs Interviews mit Kreativdirektor/innen analysiert, welchen Herausforderungen diese Zielgruppe in ihrem Berufsalltag begegnen. Das Ergebnis der Untersuchung zeigt, dass neben der Vereinbarung von kreativem Arbeiten mit Führungsaufgaben neue Organisationsformen, der digitale ...
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Weinen im Coaching – oder: Gehört der Taschentuchspender in jede Coachingpraxis?
(2022-03-30)
Das Weinen als fundamentaler menschlicher Emotionsausdruck wirft innerhalb verschiedener Fachdisziplinen seit jeher Fragen auf. In den letzten Jahren lässt sich auch innerhalb der klinischen Forschung eine zunehmende Beschäftigung mit diesem Thema beobachten. U. a. konnte im Rahmen einer Untersuchung an der Universität Kassel eine Systematisierung über verschiedene Formen des Weinens in der Psychotherapie und unterschiedliche therapeutische Verhaltensweisen im Umgang damit entwickelt werden. Im vorliegenden Artikel ...
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Harnessing the Potential of Wheat-Pea Species Mixtures: Evaluation of Multifunctional Performance and Wheat Diversity
(2022-03-25)
Species mixtures and heterogeneous crop populations are two promising approaches for diversified ecological cropping systems with increased resilience and reduced dependency on external inputs. Inter- and intraspecific diversity were evaluated in combination using 15 wheat (Triticum aestivum) entries, including line cultivars and heterogeneous populations (HPs), from central Europe and Hungary and one winter pea cultivar under organic conditions. Monocultures and wheat mixtures were evaluated multi-functionally for ...
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Growth of C-S-H phases on different metallic surfaces
(2022-02-21)
The influence of reinforcement, especially fibre reinforcement in ultra-high performance concrete is strongly dependent on the bonding (adhesive, shear and friction bond) between metallic surface and cementitious matrix. As usually straight fibres are used for fibre reinforcement and, thus, no significant mechanical bonding is existent, the adhesive bond is particularly important. Previous studies stated that the adhesive bonding behaviour between metallic materials and cementitious matrix strongly depends on the ...
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Control of Jump Markov Uncertain Linear Systems With General Probability Distributions
(2022-02-25)
This paper introduces a method to control a class of jump Markov linear systems with uncertain initialization of the continuous state and affected by disturbances. Both types of uncertainties are modeled as stochastic processes with arbitrarily chosen probability distributions, for which however, the expected values and (co-)variances are known. The paper elaborates on the control task of steering the uncertain system into a target set by use of continuous controls, while chance constraints have to be satisfied for ...
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An engineering perspective on the numerics of quasi-periodic oscillations
(2022-04-29)
The phenomenon of quasi-periodicity in deterministic dynamical systems describes stationary solutions, which neither exhibit a finite period length nor are chaotic. Recently, an increasing demand for robust numerical methods is driven by applied dynamics and industrial applications. In this context, direct time integration proves to be impractical due to extensive integration intervals. Therefore, in a first step, this contribution aims on giving an application oriented survey of the basic theory as well as alternative ...