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Dissertation
Development of Selectively Actuatable Micromirror Arrays and Scalable Lithography Processes for Large-Area Applications as Smart Window
(2023)
This thesis provides an extensive overview on the state-of-the-art daylighting systems for applications in buildings and subsequently addresses the implementation of subfield addressing in micromirror arrays and investigation of a potential scalable lithography process for the large-area fabrication, both have been identified as the research gap in achieving the envisioned application as smart window. The work is conducted in continuation of the optimized fabrication process and the successful fabrication of a lab ...
Dissertation
Algorithms for Emotion Recognition
(2023)
Technological advancements have increasingly facilitated emotion recognition through physiological sensors integrated into intelligent devices, such as earables and wristbands. People commonly wear these devices in their everyday lives (i.e., in the wild). Patterns can be extracted from various physiological signals, enabling the recognition of emotions. This capability can be integrated into diverse applications, such as attention management systems, human-robot interaction, and stress detection, enhancing them to ...
Dissertation
Transforming towards a sustainable circular economy: exploring the social dimension, actor contribution and emerging paradoxes
(2023)
Pressing global societal challenges highlight organisational vulnerability and the need to transform towards more sustainable production and consumption measures. The circular economy concept is considered an alternative to the prevalent linear economic system. It aims to contribute to sustainable development by slowing and closing resource cycles and facilitating cross-sectoral collaboration of multiple stakeholders. Yet, the desired transformation is lagging behind and the current debate focuses primarily on the ...
Dissertation
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Plastic packaging waste management in Germany: Evaluating and optimizing material flows and environmental impacts
(2023)
Since 1990, the annual plastic packaging consumption by private end users in Germany more than doubled. This trend can be attributed to plastic's advantageous properties such as its low weight, cost-effectiveness, and customizable features. However, plastic packaging is also widely criticized due to its dependency on fossil fuels, short lifespan, and potential contribution to marine littering. The tension between the popularity of plastic packaging and the environ-mental challenges associated with a short-term product ...
Dissertation
Investigation and Elimination of Substructures in Formal Concept Analysis focusing on Boolean Suborders and Subcontexts
(2023)
In the field of Formal Concept Analysis, data is mainly presented in so-called formal contexts, which assign to a set of objects their respective attributes. From those concept lattices can be generated, where the objects are grouped with respect to their common attributes to represent the relationships in the data in a way that enhances the understandability for humans. However, since a concept lattice can be of exponential size compared to its associated formal context, the presented relationships often become hard ...
Dissertation
Regulatory mechanisms of Protein kinase A - Isoform mediated fine-tuning
(2023)
cAMP-dependent protein kinase (PKA) is a crucial part in eukaryotic signal transduction and controls biological processes. With a multitude of substrates, a great variety of cellular functions are regulated by PKA. Regulation of metabolism, cell growth and -differentiation, conductivity of ion channels, movement of sperm cells, embryonic development, neuroplasticity as well as conversion of short- to long-term memory are just examples for the many tasks of the kinase. To achieve and coordinate these diverse functions, ...
Dissertation
Entwicklung und Erprobung einer kognitiv-sensorischen Methodik für die Erhöhung der Reliabilität von erhobenen Daten in Bezug auf Nachhaltigkeit und Konsumentenverhalten in Deutschland und in der Ukraine
(2023)
Die menschlichen Sinne werden als Brücke zwischen der Mitwelt und dem menschlichen Körper sowie als entscheidender Faktor bei der Bildung von Ernährungserfahrungen beginnend schon im Mutterleib betrachtet. Diese Studie zielt darauf ab, wissenschaftlich zu untersuchen, wie der Wandel hin zu einer nachhaltigen Ernährung unterstützt werden kann, indem das Konsumentenverhalten sowie deren Flexibilität und Änderungsbereitschaft mithilfe einer neuen kognitiv-sensorischen Methode bewertet und bemessen wird.
Im Literaturteil ...
Dissertation
Lignocellulosic biorefinery with a thermo-biological pretreatment concept
(2023)
There is great interest, not only in technologically advanced societies, in developing innovative sources of raw materials, especially lignocellulosic biomasses such as cereal straw, which do not interfere with food production. In Germany, 4 – 9 million tons of cereal straw, mainly wheat, are utilized annually, corresponding to an energy potential of 57 – 129 PJ/a. Lignocellulose, found in plant cell walls, consists of hemicellulose, cellulose, and lignin, and it requires complex fractionation to enable its polymers ...
Dissertation
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Populationsgenetik und Phylogeographie des Großen Immergrüns (Vinca major L.; Apocynaceae) im autochthonen vs. allochthonen Verbreitungsgebiet
(2023-04-21)
Populationsgenetik und Phylogeographie des Großen Immergrüns (Vinca major L.; Apocynaceae) im autochthonen vs. allochthonen Verbreitungsgebiet
Das Große Immergrün (Vinca major L., Apocynaceae) stammt aus dem Mittelmeerraum und wurde durch den Menschen als Nutz-, Arznei- und Zierpflanze sowie wegen seiner mythologischen Bedeutung in zahlreiche zuvor unbesiedelte Gebiete verschleppt. In einigen Regionen des allochthonen Areals (Australien, Neuseeland, USA) gilt V. major als invasiv und wird massiv bekämpft. Ziel ...
Dissertation
The role of sustainability in capital markets
(2023)
This doctoral thesis explores capital market sustainability, focusing on the European capital market.
The work takes two different angles, either from the investors perspective while subsequently examining if reported ESG activities and an ESG rating's sustainability performance affect a company's valuation or risk.