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Mechanically induced dye-release from polyurea microcapsules in a rubbery adhesive
(2023-07-13)
Especially in the building industry the demand for in situ monitoring concepts of adhesive joints persists. In a new approach, microcapsules filled with special dyes, are added into a rubbery adhesive. Certain stress levels within the adhesive lead to a breakage of the capsules, which release their liquid cores. This results in a detectable colour change and thus, enables non-destructive condition monitoring of the bond. Dye-filled polyurea microcapsules were produced by interfacial polymerization by varying synthesis ...
Aufsatz
A General Strategy for Increasing the Air Stability of Phosphines Including Primary Phosphines
(2023-08-31)
A general approach for increasing the air-stability of various primary phosphines in the absence of kinetic stabilization is presented that contrasts with previous interpretations, which were limited to specific phosphines. This contribution shows the synthesis of a series of air-stable primary phosphines Fc(CH₂)nPH₂, where n=0,1,2,3; and Fc=ferrocenyl, and their corresponding isolable primary phosphine oxides. It was demonstrated that the ferrocene moiety exerts an antioxidant effect on the primary phosphine group, ...
Buch
Segregierte Quartiere – segregierte Freizeiträume
(Springer VS, 2024)
Dieses Open-Access-Buch stellt vor dem Hintergrund einer zunehmenden sozialen Segregation in deutschen Städten die Frage nach den Auswirkungen dieser sich verschärfenden räumlichen Polarisierung auf die Sozialisation von Jugendlichen. Die Arbeit geht dabei über den quartiersfixierten Ansatz der Nachbarschaftseffektforschung hinaus und untersucht, welche Räume in der Stadt von Berliner Jugendlichen in ihrer Freizeit tatsächlich genutzt werden und damit für sie sozialisationsrelevant sind. Der Fokus liegt auf dem ...
Aufsatz
Lipidome remodeling in response to nutrient replenishment requires the tRNA modifier Deg1/Pus3 in yeast
(2023-10-21)
In the yeast Saccharomyces cerevisiae, the absence of the pseudouridine synthase Pus3/Deg1, which modifies tRNA positions 38 and 39, results in increased lipid droplet (LD) content and translational defects. In addition, starvation-like transcriptome alterations and induced protein aggregation were observed. In this study, we show that the deg1 mutant increases specific misreading errors. This could lead to altered expression of the main regulators of neutral lipid synthesis which are the acetyl-CoA carboxylase (Acc1), ...
Aufsatz
Basisarbeit und menschengerechte Arbeitsgestaltung – Strategische Erfordernisse und Ansätze
(2023-11-24)
In diesem Beitrag wird der Aspekt der Basisarbeit beleuchtet, der aus der zunehmenden Komplexität der technischen Entwicklung resultiert. Eine technologische Entwicklung im Rahmen des Gesamtsystems wird nicht linear aus ergonomischen Anforderungen heraus entwickelt, sondern erwächst aus einem komplexen und dynamischen Wechselspiel zwischen unterschiedlichen Akteur/-innen. Aus dieser Eigendynamik des Gesamtsystems ergeben sich ungünstige Entwicklungen, die Sheridan (2002) als ‚Entfremdung‘ und ‚Versklavung‘ des Menschen ...
Aufsatz
Value-based bricolage
(2023-08-11)
Circular-born firms face resource constraints first, as they emphasize the use and reuse of materials as an opposite to the linear production system of taking, making, and disposing of resources, and second, due to systemic challenges like lack of scale and information on resources. Given these challenges, entrepreneurs need to find novel solutions for resource mobilization in the circular economy (CE). This study aims to identify how entrepreneurs mobilize resources to accomplish these challenges. With qualitative, ...
Aufsatz
Die Rolle der Beratung in der gesellschaftlichen Transformation zu mehr Nachhaltigkeit
(2024-01-10)
Die Welt befindet sich im Umbruch, die Transformationsforschung (Umweltbundesamt 2017) nimmt dies auf und denkt soziale und ökologische Faktoren zusammen, um die Dichotomie zwischen Profit und Gemeinwohl zu hinterfragen. Die tiefgreifenden Veränderungen führen zu einer überarbeiteten Strategieberatung. Sie wird iterativer und stellt sich stärker auf disruptive Entwicklungen ein. Kunden und externe Partner werden früher und intensiver eingebunden. Obwohl es einen Zweig sich entwickelnder Beratung von Nachhaltigkeit ...
Aufsatz
Universalist children’s services. From two-part to inclusive social infrastructure
(2024-01-11)
The scientific network “Universalist Children’s Services: From Two-Part to Inclusive Social Infrastructure,” funded by the German Research Foundation, comprises 20 researchers. Its purpose is to contribute to the development of a more inclusive design of the public children’s services system. To achieve this objective, the network integrates legal and educational perspectives in its analysis of the current structure of the children’s services system. The network’s starting point is the concept of universalist children’s ...
Aufsatz
Drought threatens agroforestry landscapes and dryland livelihoods in a North African hotspot of environmental change
(2024-02-08)
Dryland agroforestry is often hailed as a nature-based solution for rural people’s water- and climate-related struggles, yet appraisals of traditional agroforestry practices and interventions in Maghreb countries are scant. In this study, we appraise whether and how agroforestry delivers as a solution to Moroccan farmers’ plight with drought. Through an analysis of landscape observations, 75 qualitative interviews, and six group discussions, we show that the region’s mountain residents risk losing their livelihoods ...
Aufsatz
Analysis and Optimization of the Loss Distribution for a Two Stage AC/DC Power Supply
(2023-12-12)
This paper presents the analysis and optimization procedure of a two-stage bidirectional AC/DC power supply. The exemplary power supply consists of a silicon carbide based active front end and a dual active bridge DC/DC converter. It is designed to supply 600 V DC applications from universal low voltage AC grids with a power up to 6 kW. The paper includes the topology and design considerations, as well as an in-depth loss distribution analysis based on a validated loss model. The loss model is then utilized for an ...