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Dissertation
Existence and Asymptotic Behavior of Solutions to the Time-Periodic Navier-Stokes Equations in a Layer Domain with Nonhomogeneous Boundary Data
(2024)
This dissertation is dedicated to the analysis of the Navier-Stokes equations in a timeperiodic framework in the so-called layer domain Π = R2 × (0, 1), described by:
∂tu − νΔu + (u · ∇)u + ∇p = f in [0, T] × Π,
div u = 0 in [0, T] × Π,
u|∂Π = a for all t ∈ [0, T] ,
u|t=0 = u|t=T in Π.
The velocity field u and the pressure p are unknowns, while the external force f is prescribed. Challenges arise due to unboundedness of the layer Π and from introduction of a nonhomogeneous boundary condition a. The investigated ...
Teil eines Buches
Jenseits des Horizonts
(Schwabe Verlag, 2022)
Im Folgenden ist deshalb zu überlegen, was diesseits und was jenseits des kartografischen Horizonts damaliger Menschen lag, wie sich die Relationen zwischen beiden Zonen in Abhängigkeit von Zeit, visualisiertem Raum und vorhandenem Wissen verschoben und welche Relevanz dem jenseitig Gelegenen dabei zukam. Es ist also nach den Dynamiken am Horizont zu fragen, dem Suchen und Überschreiten, den Akten des Stabilisierens und Flexibilisierens, den erkenntnistheoretischen Voraussetzungen und den kulturellen Praktiken, die ...
Aufsatz
Consumers ’ perception of sustainable packaging in the food industry: An online experiment
(2022-01)
Consumers evaluate products and make purchasing decisions based on packaging and its sustainable aspects. This research investigated how different packages and their quality, eco-friendliness, expensiveness, and convenience affected consumers’ intentions to purchase. Our sample comprised 299 French consumers of muesli cereals. We conducted an online choice experiment to analyze and measure consumers’ perception of sustainable packaging, comparing three distinct experimental groups. Findings revealed that quality and ...
Aufsatz
Geschichtswissenschaft
(2021-07-15)
Die mittelalterliche Geschichte ist derzeit noch relativ fester Bestandteil des allgemeinen Geschichtsunterrichts, obwohl die zeitliche Differenzierung durch die Kompetenzorientierung in den Lehrplänen immer weiter zurückgedrängt wird. Anders als rein chronologisch-inhaltliche Lehrpläne bietet die Kompetenzorientierung jedoch grundsätzlich gute Möglichkeiten, ‚mittelalterliches‘ Material einzubauen. In den meisten geisteswissenschaftlichen Fakultäten existiert in der Regel – mit einigen Ausnahmen – eine eigene ...
Rezension
[Rezension zu:] Yossef Rapoport, Emilie Savage-Smith, Lost Maps of the Caliphs. Drawing the World in Eleventh-Century Cairo, Chicago (The University of Chicago Press) 2018, 368 p., ISBN 978-0-226-54088-7, USD 59,00.
(2022-12-21)
Rezension von Ingrid Baumgärtner zu: Yossef Rapoport, Emilie Savage-Smith, Lost Maps of the Caliphs. Drawing the World in Eleventh-Century Cairo, Chicago (The University of Chicago Press) 2018, 368 p., ISBN 978-0-226-54088-7, USD 59,00.
Rezension
[Rezension zu:] Alfred Hiatt, Dislocations. Maps, Classical Tradition, and Spatial Play in the European Middle Ages (Studies and Texts 218). Toronto, Pontifical Institute of Mediaeval Studies. Turnhout, Brepols 2020. XII, 347 S. 42 farb. Abb.
(2023-07-06)
Rezension von Ingrid Baumgärtner zu: Alfred Hiatt, Dislocations. Maps, Classical Tradition, and Spatial Play in the European Middle Ages (Studies and Texts 218). Toronto, Pontifical Institute of Mediaeval Studies. Turnhout, Brepols 2020. XII, 347 S. 42 farb. Abb.
Masterarbeit
Analysis and Method Selection of a Measure-Correlate-Predict Methodology for a Digital Wind Buoy
(2022)
The determination of the site-specific wind conditions has a significant influence on the development and use of offshore wind energy. Lower uncertainties of wind potential result in cost-effective project financing. Floating lidar systems (FLS) or wind lidar buoys have become increasingly common in recent years as a measuring technology for the determination of offshore wind resource. However, due to harsh offshore environmental conditions, offshore measurements with FLS are prone to reliability issues which might ...
Dissertation
City Development Regimes in-the-Making. Phronetic Analysis of Governance, Networks and Power in Cairo, 2011-2022
(2024)
Since the revolutionary uprising of January 2011, Cairo’s inner-city neighbourhoods have undergone rapid spatial transformations. Over the last decade, numerous old housing buildings have been replaced by modern ones, leading to the displacement of residents to the desert cities or newly-constructed neighbourhoods outside the city centre. The most remarkable transformations occurred since early 2018. Notably, these changes have been characterised by a fast implementation rate and a lack of community resistance to ...
Aufsatz
On the Influence of Surface Hardening Treatments on Microstructure Evolution and Residual Stress in Microalloyed Medium Carbon Steel
(2020-06-09)
Tailoring surface properties is a key to superior performance of components subjected to fatigue loadings in application. Process–microstructure–property relationships have to be established to allow for optimization of techniques employed for surface treatments such as deep rolling and induction hardening. Although both techniques are employed widely in industrial application, studies examining microstructure evolution and residual stress states for a single material in a comparative manner are missing. Amongst ...
Aufsatz
Cooling rate as a process parameter in advanced roll forming to tailor microstructure,mechanical and corrosion properties of EN AW 7075 tubes
(2022-12-14)
The effects of solution heat treatment parameters and quench media as a processing tool for tailoring microstructure, mechanical and corrosion properties in roll forming of EN AW 7075 alloy were studied. The highest yield stress and ultimate tensile strength were obtained for the specimens quenched in water, while the air-cooled specimens exhibited inferior mechanical properties. Microstructural analysis of specimens showed that except water-quenched specimens, the parts cooled/quenched in oil, in direct contact with ...