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Development and Process Integration of an Alternative Demoulding System for High-Pressure Die Casting Using a Contoured Vacuum Mask
(2024-06-11)
This study presents the development and process integration of an alternative demoulding system for high-pressure die casting. The system is aimed at the removal of large structural castings, which are becoming increasingly popular in the industry under the terms mega- and gigacasting. The development differs from conventional systems in the fact that it completely avoids ejectors and realises the demoulding via the principle of vacuum suction cups. Preliminary tests were carried out in which various established ...
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Soil contribution to the cobalamin (vitamin B12) supply of terrestrial organisms
(2024-05-09)
Cobalamin (Vitamin B12) is a cofactor for many enzymes, including those in bacteria, archaea, algae, and mammals. In humans, cobalamin deficiency can lead to pernicious anaemia as well as gastrointestinal and neurological disorders. In contrast to marine ecosystems, there is a great paucity of information on the role of soils and terrestrial plants in the supply of cobalt and cobalamin to microorganisms and animals. The content of cobalt cations in most soils is usually sufficient to maintain growth, and the density ...
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Pectin forms polymeric pigments by complexing anthocyanins during red winemaking and ageing
(2024-05-05)
The long-term stability of red wine color depends on the formation of polymeric pigments from anthocyanins. Although there is still a lot of uncertainty about the specific structure of this diverse group of pigments, there is consensus that they are reaction products of anthocyanins and other polyphenols. Interactions between anthocyanins and pectic polysaccharides have been suggested to stabilize anthocyanins. This study explores the impact of such interactions by adding pectin during red winemaking. The results ...
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Galactosamine and mannosamine are integral parts of bacterial and fungal extracellular polymeric substances
(2024-03-22)
Extracellular polymeric substances (EPS) are produced by microorganisms and interact to form a complex matrix called biofilm. In soils, EPS are important contributors to the microbial necromass and, thus, to soil organic carbon (SOC). Amino sugars (AS) are used as indicators for microbial necromass in soil, although the origin of galactosamine and mannosamine is largely unknown. However, indications exist that they are part of EPS. In this study, two bacteria and two fungi were grown in starch medium either with or ...
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Investigations of lightweight concrete by in situ compression tests using high-resolution computed tomography (μ-CT)
(2024-02-24)
The fracture behaviour of concrete is studied in various micro- and macrodamage models. This is important for estimating serviceability and stability of concrete structures. However, a detailed understanding of the material behaviour under load is often not available. In order to better interpret the fracture behaviour and pattern, images of lightweight concrete were taken using a highresolution computed tomography (μ-CT) scanner. The samples were loaded between the taken images and the load was kept constant during ...
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Sexuelle Inaktivität und sexuelle Unzufriedenheit bei Paaren in der mittleren Lebensphase nach im Mittel 31 Jahren Beziehungsdauer
(2024-04-30)
Theoretischer Hintergrund. Sexuelle Aktivität und Erleben verändern sich über die Lebensspanne. Unabhängig vom Alter ist ein reduziertes bzw. fehlendes sexuelles Verlangen die am häufigsten berichtete sexuelle Problematik. Es fehlen Studien an Paaren in langjährigen stabilen Partnerschaften. Fragestellung. Ziel war, die sexuelle Inaktivität und Unzufriedenheit von Paaren in der mittleren Lebensphase zu untersuchen. Methode. Es wurden Daten des 18-Jahres Follow-Ups der Längsschnittstudie „Zukunft Familie“ verwendet. ...
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“Industry impacts more than nature” - Risk perception of natural hazards in more-than-human worlds
(2024-05-18)
Understanding the risk perceptions of natural hazards is vital for disaster mitigation. Despite extensive research on the topic, local and indigenous perspectives often remain marginalized and underrepresented. One reason discussed is the inherent Eurocentrism in knowledge production. Using narrative interviews with fishermen in the Patagonian fjord lands, we developed a grounded theory on risk perception against the background of actor–network theory to adress this criticism.
The emergent order of risk perception ...
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Electron beam powder bed fusion of Ti-30Ta high-temperature shape memory alloy: microstructure and phase transformation behaviour
(2024-06-19)
The present study reports on additive manufacturing of a Ti-30Ta (at.%) high-temperature shape memory alloy (HT-SMA) using electron beam powder bed fusion (PBF-EB/M) technique. Detailed microstructure analysis was conducted to reveal the microstructural evolution along the entire process chain, i.e. from gas-atomised powder to post-processed material. PBF-EB/M processed structures with near full density and an isotropic, β-phase stabilised microstructure, i.e. equiaxed β-grains of around 20 μm in diameter with no ...
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Machine learning parameter systems, Noether normalisations and quasi-stable positions
(2024-06-25)
We discuss the use of machine learning models for finding “good coordinates” for polynomial ideals. Our main goal is to put ideals into quasi-stable position, as this generic position shares most properties of the generic initial ideal, but can be deterministically reached and verified. Furthermore, it entails a Noether normalisation and provides us with a system of parameters. Traditional approaches use either random choices which typically destroy all sparsity or rather simple human heuristics which are only ...
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The impact of testosterone-lowering medication on recidivism in individuals convicted of sexual offenses
(2024-06-05)
Introduction: Treatment of individuals who have committed sexual offences with Testosterone-Lowering Medication (TLM) is a comparatively intrusive kind of intervention, which regularly takes place in coercive contexts. Thus, the question of efficacy, but also the question of who should be treated, when and for how long, are of great importance. Methods: Recidivism rates of TLM-treated high-risk individuals (þTLM; n¼54) were compared with high-risk individuals treated with psychotherapy only in the same forensic ...