Eldorado - Repositorium der TU Dortmund

Ressourcen aus und für Forschung, Lehre und Studium

Bei diesem Service handelt es sich um das Institutionelle Repositorium der Technischen Universität Dortmund. Hier werden Ressourcen aus und für Lehre, Studium und Forschung gespeichert, erschlossen und der Öffentlichkeit zugänglich gemacht.

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Aktuellste Veröffentlichungen

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    Is it contagious? The effect of fear of failure on employee satisfaction
    (Elsevier BV, 2024-11-21) Rössig, Sarah-Alena; Schmidt, Corinna Vera Hedwig; Schrewentigges, Lisa; Strese, Steffen
    Fear of failure is a negative emotion among entrepreneurs at all stages of the entrepreneurial journey. However, prior research focuses on entrepreneurs in the aspiration stage or individual-level outcomes. Drawing on emotional contagion theory, we suggest that entrepreneurs’ fear of failure is transmitted to their employees, influencing their work experience. We use an exploratory mixed-method design combining survey and secondary data for the quantitative analysis (study I) and conducted interviews with entrepreneurs for the qualitative analysis (study II). We find that the entrepreneur’s fear of failure is negatively related to employee satisfaction. A context characterized by low participativeness in strategic decision-making or an entrepreneur’s low internal locus of control strengthens the negative relationship. Our research sheds light on the emotional contagion processes in entrepreneurship and extends the theory of emotional contagion by introducing participative strategic decision-making as a team environment and entrepreneurs’ locus of control as an individual trait.
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    Large housing estates in Germany’s major cities: a last bastion of affordable housing?
    (2026-07-20) Siedentop, Stefan; Schartmann, Maximilian; Münster, Melissa
    The affordable housing crisis in many major German cities has sparked a new wave of suburbanization. In thriving cities such as Berlin, Cologne, Munich, Frankfurt, and Hamburg, rental prices in central locations have reached unprecedented highs. Amid this situation, large housing estates (LHEs) built between the 1950s and 1980s on city outskirts are often regarded as the last strongholds of affordable housing. The sharp rise in housing prices within Germany’s major cities has reshaped the traditional perception of these residential areas as centers of social disadvantage and conflict. Nevertheless, rents within these LHEs have also been increasing over the years due to neoliberal policies promoting financialization and privatization. In this context, this article analyzes rent levels in LHEs across major German cities and compares them to the average rents within their respective urban areas. Using a geodata‐based methodology, we first identify LHEs that were built between 1949 and 1990 and that meet a minimum threshold of 1,000 inhabitants. Our study covers all German cities with populations exceeding 100,000 residents. Subsequently, fine‐grained raster data from the 2022 census is employed to calculate average rent levels at settlement scale. Our analysis revealed statistically significant differences between the average rent levels in LHEs and the overall citywide average. The article concludes with reflections on strategies to preserve affordable housing in the affected urban areas.
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    Datenmanagement für forschungsnahe Dienstleistungen
    (2026-07-23) Höhner, Kathrin; Becker, Hans Georg; Wirkner, Dominic
    Das Poster präsentiert die Systemlandschaft der Universitätsbibliothek Dortmund in den Bereichen "Publikationsunterstützung und forschungsnaher Dienstleistungen". Linked Data und deren optimierte Nachnutzung sind leitende Aspekte in der Planung und Umsetzung. Wann immer möglich, werden Normdaten, systemagnostische und offene Identifikatoren sowie Standardschnittstellen verwendet. Das Metadatenmanagementsystem (MMS), das kooperativ mit der UB Bochum entwickelt wurde, bildet das Fundament der Hochschulbibliographie, erzeugt Publikationslisten und dient als Quelle für das Suchwerkzeug Katalog Plus. Über die ORCID-Anbindung werden Informationen und Änderungen an Publikations- und Beschäftigungsdaten bidirektional synchronisiert. Darüber hinaus wird das MMS durch die Repositorien Eldorado (Textdokumente) und TUDOdata (Forschungsdaten) mit Metadaten versorgt. Beide Repositorien werden kuratiert und erfüllen wichtige Anforderungen, wie die Pflichtabgabe an die Deutsche Nationalbibliothek oder Möglichkeiten zur Langzeitverfügbarkeit, letztere unterstützt durch die vom HBZ NRW betriebene Software Rosetta. Um Forschende zusätzlich im Bereich Open-Access zu unterstützen, werden im Laufe des Jahres 2025 Publikationsplattformen für Zeitschriften und Monografien bereitgestellt. An Eldorado angebunden, profitieren diese automatisch von den genannten Vorteilen und verteilen ihre Metadaten dadurch über die gesamte Systemlandschaft. Die implementierten Schnittstellen ermöglichen zudem einen Informationsaustausch über Drittmittelprojekte und liefern Daten für Reporting-Anfragen (TU-intern, ministeriale Anfragen) mit den Systemen der Hochschulverwaltung und der Forschungsberichterstattung. Eine derart vernetzte Systemlandschaft ist sicherlich eine Herausforderung, bietet jedoch enorme Vorteile im Hinblick auf Zuverlässigkeit und Nachhaltigkeit. Sie ermöglicht einen direkten und effizienten Informationsaustausch zwischen Forschenden, Verwaltung und Bibliothek. Die umgesetzte Modularität erhöht zudem die Anpassungsfähigkeit der Infrastruktur und sichert dadurch einen langfristigen Betrieb.
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    Hole spin coherence in InAs/InAlGaAs self‐assembled quantum dots emitting at telecom wavelengths
    (arXiv, 2024-09-02) Evers, Eiko; Kopteva, Nataliia E.; Nedelea, Vitalie; Kors, Andrei; Kaur, Ranbir; Reithmaier, Johann Peter; Benyoucef, Mohamed; Bayer, Manfred; Greilich, Alex
    Measurements of the longitudinal and transverse spin relaxation times of holes in an ensemble of vertically tunnel-coupled self-assembled InAs/In0.53 Al0.24 Ga0.23 As quantum dots (QDs), emitting in the telecom spectral range, are reported. The spin coherence is determined using the spin mode-locking method in the inhomogeneous ensemble of QDs. Modeling the signal allows us to extract the hole spin coherence time to be in the range of 𝑇2 =0.02 −0.4  μs. The longitudinal spin relaxation time 𝑇1 =0.5  μs is measured using the spin inertia method. The parameters investigated allow us to suggest that the main relaxation mechanism at low magnetic fields is related to the electron–hole spin exchange.
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    Modeling of residence time distributions of twin-screw extrusion processes considering various screw types
    (MDPI AG, 2026-07-18) Kimmel, Vincent; Zöllig, Dario; Hoheisel, Werner; Winck, Judith; Thommes, Markus
    Residence time in pharmaceutical hot-melt extrusion is a crucial process parameter affecting the quality attributes of a dosage form such as content uniformity, bioavailability and toxicity. There is a lack of knowledge about the influence of screw element types on the residence time distribution, which will be addressed in this study. Methods: Different conveying and kneading elements will be characterized concerning their effect on the residence time using a co-rotating twin-screw extruder with a 28 mm screw diameter. Tracer experiments will be performed while concentration time profiles are measured via inline UV-Vis spectroscopy. Results: The residence time distribution of all screw types is primarily related to the volume flow but independent of pressure. The two-compartment model of Reitz was utilized to describe the experimental data mathematically. Screw-type-specific dimensionless parameters were derived to quantify the axial mixing performance, as well as the effect on residence time. Conclusions: The influence of different screw elements on the residence time in hot-melt extrusion processes was quantified using a dimensionless mixing volume and a dimensionless axial dispersion coefficient. The results meet the quantitative descriptions from the literature.