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Dissertation
Combining crop growth models with the Precision Agriculture concept of yield gap analysis to evaluate yield limiting and reducing factors
(2022)
The agricultural sector is considered as one of the main elements of a “functional” society and its welfare for providing means to fulfil the most basic human need for food. In the past, an improved overall welfare of developed countries was directly related to early investment in conventional farming machinery parallel to the industrial development. With the expected future population increase and climate change, farm yield gaps are expected to increase and become more volatile. The awareness of negative externalities ...
Aufsatz
Ti6Al4V lattice structures manufactured by electron beam powder bed fusion - Microstructural and mechanical characterization based on advanced in situ techniques
(2022-12-17)
Powder bed fusion (PBF) processes enable the manufacturing of complex components in a time- and cost-efficient manner. Especially lattice structures are currently focused since they show varying mechanical properties, including different deformation and damage behaviors, which can be used to locally tailor the mechanical behavior. However, the present process-structure-property relationships are highly complex and have to be understood in detail in order to enable an implementation of PBF manufactured lattice structures ...
Aufsatz
Predicting Flow Stress Behavior of an AA7075 Alloy Using Machine Learning Methods
(2022-09-09)
The present work focuses on the prediction of the hot deformation behavior of thermo-mechanically processed precipitation hardenable aluminum alloy AA7075. The data considered focus on a novel hot forming process at different tool temperatures ranging from 24°C to 350°C to set different cooling rates after solution heat-treatment. Isothermal uniaxial tensile tests in the temperature range of 200°C to 400°C and at strain rates ranging from 0.001 s-¹ to 0.1 s-¹ were carried out on four different material conditions. ...
Dissertation
Designing Breeding Programs For Improving Milk Yield Performance Of Indigenous Genous Dairy Cattle In Sudan
(2022)
The overall aim of the present study was to design appropriate breeding programs for the sustainable improvement of Butana cattle in Sudan. Four studies were conducted, beginning with a comprehensive review of literature on indigenous dairy cattle breeding strategies in sub-Saharan Africa with a focus on the factors that contribute to their success or failure. It showed that crossbreeding of indigenous breeds with exotic breeds has been widely used for genetic improvement, but it largely failed under low-input ...
Dissertation
Taking a Closer Look at the Desirability of Desirable Difficulties - Additionally Focusing on Required Prerequisites, Negative Side-Effects, and Negative Consequences
(2022)
As the title of my dissertation already indicates, the main purpose of the following work was to take a closer, more thorough, and encompassing look at the desirability of desirable difficulties. The term desirable difficulties thereby subsumes varying types of difficult, demanding, and challenging learning strategies—like the application of (learning/practice) tests and generation tasks: Working on and successfully solving those difficult tasks requires more (cognitive) effort compared to working on easier learning ...
Dissertation
Validation of a generalized model for the description of polycrystalline exchange-biased magnetic thin films
(2022)
Applications based on nano- and microscaled systems have become indispensable in many aspects in everyday life, industry, research and medicine. In this regard, thin film technology plays a crucial role with the physical properties of solids changing significantly when they are reduced to thin layers with thicknesses in the nanometer range. In this regime, a solid’s microstructure as well as boundary and surface effects start to dominate. A prominent example is the exchange bias effect, which results due to the ...
Teil eines Buches
La tradición discursiva como concepto transdisciplinario: lingüística, literatura y ciencias culturales
(Iberoamericana / Vervuert, 2022)
Una cuestión fundamental que la lingüística se plantea es averiguar qué principios, reglas y tradiciones se emplean en la realización de tareas comunicativas y de dónde viene la tradicionalidad del habla. El concepto de tradición discursiva responde a cómo se configuran las plantillas textuales y los patrones del discurso y permite reconocer la tradicionalidad del habla. El propósito de esta contribución es mostrar cómo este concepto, forjado en la lingüística románica, resulta productivo en las áreas de confluencia ...
Teil eines Buches
sie hazeten sie vil sêre: Eine intersektionale Analyse der Dido-Episode in Heinrichs von Veldeke Eneasroman
(V&R unipress, 2022)
Im titelgebenden Zitat aus Heinrichs von Veldeke Eneasroman (1170–1188), einem mittelhochdeutschen Versepos, schildert die Erzählinstanz, wie die karthagische Königin Dido zum Hassobjekt ihrer ehemaligen Werber und fortan Feinde wird, nachdem sie den vertriebenen Trojaner Eneas zum Mann nimmt. Dabei wird deutlich, dass mehrere Kategorien angesprochen werden, deren Interdependenzen es zu ergründen gilt.
Dissertation
Entwicklung einer vereinfachten europaweit anwendbaren Methodik zur Festlegung von Effizienzanforderungen an Wärmerückgewinnungssysteme in der Raumlufttechnik für Nicht-Wohngebäude auf der Grundlage mehrdimensionaler Optimierungsberechnungen
(2022)
Die vorliegende Dissertation beschäftigt sich mit der Anpassung der EU-Verordnung 1253/2014, welche die Effizienzkriterien an die WRG von RLT-Geräten in NWG festlegt. Die Verordnung definiert die Anforderungen als starre Grenzwerte, die vom Süden bis zum Norden Europas gelten ohne den jeweiligen Standort oder die Gebäudenutzung zu berücksichtigen. Gemäß den Referenzwerten der aktuellen Verordnung wurde eine Verschärfung des Anforderungsniveaus diskutiert, wobei auch hier zunächst starre Grenzwerte geplant waren. Der ...
Rezension
[Rezension zu:] Colin Dupont, Cartographie et pouvoir au XVIe siècle. L’atlas de Jacques de Deventer. (TERRARVM ORBIS. Histoire des répresentations de l’espace: textes, images, vol. 16.) Turnhout, Brepols 2019. 351 S., 89 Abb., € 120,–. // doi 10.1515/hzhz-2022-1044
(2022-02-01)
Rezension von Ingrid Baumgärtner zu: Colin Dupont, Cartographie et pouvoir au XVIe siècle. L’atlas de Jacques de Deventer. (TERRARVM ORBIS. Histoire des répresentations de l’espace: textes, images, vol. 16.) Turnhout, Brepols 2019. 351 S., 89 Abb., € 120,–.