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Shared digital artifacts – Co-creators as beneficiaries in microlearning development
(2023-08-11)
Continuing vocational training benefits from the employees’ ability to share individual experience and expertise with their co-workers, as these assets constitute competitive advantages for companies. IT-supported systems can facilitate processes of knowledge elicitation (e. g. as part of collaborative co-creation) to ensure retainment of preferred qualitative characteristics of the resulting knowledge artifacts and provide ample opportunities to manage and configure a growing number of such artifacts in a company’s ...
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Conditional Freedoms: Non-State Labour in Cuba between Institutional Delegitimisation and Civic Recognition
(2023-09-11)
During the height of its power over everyday life, between 1968 and 1993, the Cuban Communist Party outlawed virtually all non-state labour and exchange. Since then, however, its continuity in power has increasingly depended on devolution: shifting responsibility for the provision of basic goods and services from failing state enterprises back to the self-employed. The latter now produce the majority of food and basic products; receive most of the national income from tourism, remittances and foreign investment; and ...
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Ultra-high performance alkali-activated slag as a reusable mold for light metal casting
(2023-12-06)
Light metal die casting is usually performed using steel molds. However, these lead to a reduced quality of the casting due to the occurrence of metal corrosion on the surface and the incorporation of hydrogen into the casting as a result of required process chemistry. Ultra-high performance concrete based on alkali-activated slag can be used to produce mineral molds for aluminum casting. The use of reusable mineral molds not only enables the production of various thin-walled geometries. The risk of metal corrosion ...
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Numerical detection of synchronization phenomena in quasi-periodic solutions
(2023-10-05)
In science and technology, dynamical systems can show so-called quasi-periodic solutions. These solutions are composed of two or more base frequencies. The solution in the time domain can be represented by an invariant manifold. To parametrize the invariant manifold, we choose the hyper-time parametrization. If quasi-periodic solutions branches are continued by means of a path continuation, the phenomenon of synchronization may occur. This is important, because the hyper-time parametrization is only valid, as long ...
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Neural network interatomic potential for laser-excited materials
(2023-08-15)
Data-driven interatomic potentials based on machine-learning approaches have been increasingly used to perform large-scale, first-principles quality simulations of materials in the electronic ground state. However, they are not able to describe situations in which the electrons are excited, like in the case of material processing by means of femtosecond laser irradiation or ion bombardment. In this work, we propose a neural network interatomic potential with an explicit dependency on the electronic temperature. Taking ...
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Mental health and stress level of Ukrainians seeking psychological help online
(2023-11-04)
Due to the Russian invasion of Ukraine on February 24th, 2022, more than 8 million Ukrainians have been displaced from their homes. Ukrainians exposed to armed conflict and migration are likely to have low levels of mental health status and seek help. We provide a uniform quantitative assessment of the mental health conditions of Ukrainians seeking help soon after the invasion and resettlement. We screen the mental well-being and psychological distress of 1165 refugees, migrants, internally displaced, and non-displaced ...
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Verbesserung der CO₂-Bilanz von Kalksandsteinen durch den Einsatz von Sägeschlamm als Optimierungszuschlag
(2023-12-06)
Rund 20% der aus den Rohstoffen Kalk, Sand und Wasser hergestellten Kalksandsteine (KS) in KS-XL-Formaten werden zur Vorkonfektionierung gesägt. Dabei fallen in den KS-Werken insgesamt rd. 20.000 t Sägeschlämme pro Jahr an, die derzeit keiner gezielten Verwendung zugeführt werden. Allerdings handelt es sich dabei bereits unter Einsatz von CO₂-intensivem Branntkalk gehärtetes Material, welches als Optimierungszusatz genutzt werden kann.
Insgesamt 13 verschiedene Sägeschlämme (SäS) wurden hinsichtlich ihrer Eignung ...
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Latent heat effects in inductive heating of shape memory alloy fibers
(2023-11-23)
Motivation of the present work is an inductive heating process, used in manufacturing a new kind of improved ultra-high performance concrete. In this novel material, fibers made out of shape memory alloys are used to increase the maximum possible fiber volume fraction, or to create an internal state of compressive stress. In contrast to other works, the underlying microstructure transformation from martensite to austenite is highlighted based on thermal analysis. Dynamic scanning calorimetry measurements are adapted ...
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Topology optimization considering self-weight
(2023-11-10)
In civil engineering self-weight loading usually represents the preponderant load case and shall therefore be considered in structural optimization. The present study investigates numerical topology optimization of structural stiffness with a bound on disposable amount of material. A customized topology optimization routine based on Sequential Quadratic Programming was built and is examined by means of known benchmark problems complemented by consideration of self-weight. This study aims to highlight the relevance ...
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Adaption of the meat attachment scale (MEAS) to Germany: interplay with food neophobia, preference for organic foods, social trust and trust in food technology innovations
(2023-09-19)
Meat-based diets are still the norm, and vegans and vegetarians represent only a small minority of the population. A transition, respectively, behavioural change towards a diet with less meat can only occur by adopting a positive attitude towards dietary changes based on reasons and motivations. The main aim of this study is to apply the meat attachment scale (MEAS) in Germany in order to analyse if this construct is a barrier towards a diet with less meat in this country. For this purpose, the impact of meat attachment ...