What is OPUS?
Siegen University Library provides a free of charge repository named OPUS Siegen (OPUS = Online PUblication Server) with the purpose to publish, archive and retrieve electronical documents produced at the University of Siegen.
What will you find here?
You will find Open-Access-Publications from all faculties of Siegen University and from the "universi" publishing house. The University Library applies acknowledged quality standards and offers support for publishing your documents.
How to participate?
For uploading documents, sign on to OPUS via Shibboleth using your ZIMT-Account.
Recently published
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Publication Open Access Die Repräsentation der Black Widow(2022-10-31)Die Masterarbeit untersucht die Repräsentation der Marvel-Superheldin Black Widow und deren Entwicklung innerhalb des Marvel Cinematic Universe (MCU) von einer sexualisierten und objektifizierten Nebenfigur zu einer zunehmend selbstbestimmten feministischen Heldinnenfigur. Im Zentrum steht die Frage, wie sich diese Entwicklung über acht Filme und einen Zeitraum von elf Jahren vollzieht und welche Rolle Geschlechterkonstruktionen sowie filmische Blickstrukturen dabei spielen. Auf Grundlage feministischer Filmtheorien zum männlichen und weiblichen Blick sowie theoretischer Ansätze zu Geschlechterstereotypen, Weiblichkeit und weiblichen Figuren im Superheld:innengenre wird die Darstellung Natasha Romanoffs hinsichtlich ihrer Figurenkonstruktion, Körperinszenierung, Kostümierung, Beziehungen, Handlungsmacht und filmischen Inszenierung analysiert. Dabei wird auch die Comicgeschichte der Figur sowie der Produktions- und gesellschaftspolitische Kontext des MCU berücksichtigt. Die Analyse zeigt, dass Black Widows frühe Filmauftritte stark durch den männlichen Blick geprägt sind. Insbesondere in Iron Man 2 (2008) und Marvel’s The Avengers (2012) wird ihr Körper sexualisiert und sie trotz vorhandener Handlungsmacht wiederholt als Objekt männlichen Begehrens inszeniert. Im weiteren Verlauf des MCU nimmt diese Form der Objektifizierung ab, während ihre Charakterentwicklung, Eigenständigkeit und narrative Bedeutung zunehmen. Einen entscheidenden Wandel markiert der Solofilm Black Widow (2021), in dem die Figur stärker als vollständiges, handlungsfähiges und emotional komplexes Subjekt inszeniert wird und sich die filmische Perspektive zunehmend einem weiblichen Blick annähert. Die Arbeit kommt zu dem Ergebnis, dass sich Black Widow innerhalb des MCU von einer sexistisch geprägten Figurenkonstruktion zu einer feministischen Ikone mit fortbestehenden Defiziten entwickelt. Dieser Wandel steht nicht nur für eine Veränderung der Figur selbst, sondern verweist zugleich auf Veränderungen der Geschlechterrepräsentation und der Produktionsbedingungen im Superheld:innengenre. Dabei spielen sowohl gesellschaftliche und feministische Diskurse als auch Veränderungen vor und hinter der Kamera eine wesentliche Rolle.Source Type: - Some of the metrics are blocked by yourconsent settings
Publication Open Access - Some of the metrics are blocked by yourconsent settings
Publication Open Access Defects in high lattice energy metal oxides by magnetic resonance and X-ray diffraction(2025-06-02)The properties of all crystalline solids are affected by structural defects and disorder. Some crystal structures tolerate or even favor various forms of defects while others restrict imperfections. How does the structure of high-valence metal oxides accommodate and keep impurities? This PhD was undertaken to experimentally examine some relationships between defects in high-valence metal oxides and their properties. As an ideal model system and technologically important material, a large part of the work is focused on alumina in two forms: anodic alumina (AAO) and fumed alumina. Some other high-valence oxides such as TiO2 and CeO2 were studied to a lesser extent. AAO films anodized in H2C2O4 were subjected to heat treatments up to 1 050 ◦C mostly in air and investigated by MAS NMR, MQMAS, XRD, ESR, FESEM and nanoindentation. A series of fumed aluminas with BET surface areas from 220 to 30m2 g−1 were also investigated by similar techniques. Deemed an essential technique to the research, the MQMAS experiment was practised on the 23Na isotope in a heavily disordered metal amide material. Additionally, it was necessary to carry out a systematic study of Guinier X-ray diffraction cameras in order to identify sources of instrumental and procedural errors in the XRD data. With the implementation of a rotatable, circular sample holder, the IPreader digitization software, and a data averaging script, the quality of the data was suitable for a reliable Rietveld refinement as quantitatively tested. With the heat treatments of AAO films and ESR, correlation between color and concentration of paramagnetic impurities was observed. The microstructural transformations in AAO, including those involving disorder, were monitored up to the highest temperature, and correlated with the mechanical properties. Similarly, a clear and consistent correlation between the microstructure of fumed alumina and its surface area, or equivalently, flame residence time, was observed. Several H species in the form of isolated OH groups were detected. Overall, the degree of defects and disorder in these oxides depended on the temperature and duration of heat treatment. The higher the temperature, the lower the level of impurities and disorder after cooling. In the case of AAO, a thermal hardening occurred above 1 000 ◦C. A similar trend is expected in other high-valence metal oxides if the atmosphere and cooling rate are chosen right.Source Type:1 4 - Some of the metrics are blocked by yourconsent settings
Publication Open Access Flucht ohne Ankunft. Formen der Hilfe als politische Momente in Begegnungen(2026)Die Studie zeigt die Herausforderungen des Ankommens von Geflüchteten in Deutschland. Flucht wird als biografische Zäsur verstanden, die das »Ganze des Lebens« infrage stellt. Basierend auf Interviews mit Geflüchteten werden Formen der Hilfe als politische Momente in Begegnungen herausgearbeitet. Solche volatilen Begegnungen ähneln »schmalen Stegen«, die biografische Brüche überwinden und es Geflüchteten ermöglichen, sich als Person zu zeigen. Indem die Arbeit das initiative Handeln von Geflüchteten betont und zeigt, wie sie trotz prekärer Bedingungen um politische Teilhabe ringen, leistet sie einen wichtigen Beitrag für eine subjektorientierte Soziale Arbeit mit Geflüchteten.Source Type:1 6 - Some of the metrics are blocked by yourconsent settings
Publication Open Access Implementierungsbedingungen digital unterstützter Angebote in der medizinischen Rehabilitation: eine Analyse förderlicher und hemmender Faktoren unter besonderer Berücksichtigung der Technikakzeptanz von Rehabilitanden(2026-08-31)Background: Digital transformation in the field of rehabilitation has gained significant momentum in recent years. It is seen as a means of addressing key societal challenges, such as demographic change, the shortage of skilled workers, and social exclusion. The COVID-19 pandemic acted as a catalyst in this regard. In order to comply with hygiene regulations and maintain rehabilitation services during the pandemic, many rehabilitation facilities increasingly turned to digital alternatives. Some of these services had already been approved by the cost bearer before the pandemic and were now used more extensively (e.g. the IRENA® aftercare services), whilst others were granted temporary approval by the cost bearer via a simplified approval process (e.g. the digital provision of services for addiction disorders). In addition, many facilities quickly digitised services previously delivered in person on their own initiative (e.g. training programmes for rehabilitation patients). Although the effectiveness of digitally supported services is now considered proven for many indications, there is still relatively little evidence regarding the conditions of composition, acceptance and implementation. However, these factors are essential for a sustainable integration into standard care and are therefore examined in this work. Methodology: This paper comprises four individual studies. At the beginning of the research project, a scientific literature review was conducted to assess the current state of international research in the field of implementing digitally supported rehabilitation services. The subsequent methodological approach was based on a sequential-explanatory mixed-methods design aimed at integrating qualitative and quantitative methods of empirical social research. The subject of the research project was first analyzed using quantitative methods (study 2 and 3) and then examined in greater depth through a qualitative approach (study 4). The results led to recommendations for action. Results: In the implementation process of digitally supported rehabilitation services, support from management, flexibility in terms of time and location, and the involvement and motivation of staff have shown to be particularly beneficial. On the other hand, technical difficulties, a lack of resources, and financial and regulatory conditions that are perceived as inadequate have caused an inhibiting effect. Overall, the acceptance of digitally supported services among rehabilitation patients is high. Habit (β = .340, p < .001), Hedonic Motivation (β = .300, p < .001), and Performance Expectancy (β = .298, p < .001) all have a significant positive influence on Attitudinal Acceptance. Conclusion: Sustainable integration of digitally supported services requires not only the measurement of effectiveness but also systematic implementation and acceptance research. In this context, existing frameworks and models should be consistently adapted to the specific research topic and empirically validated. The recommendations for action derived from the studies can serve as an important first step in identifying factors that facilitate or hinder implementation processes and in promoting the acceptance of digitally supported services.Source Type:
