Eldorado - Repository of the TU Dortmund
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Comment on logins – on the connection between normative explanatory reasons and normative reasoning reasons
(2024-09-07) Schmidt, Eva
The comment starts with a brief exposition of the Eroteric View put forth by Artūrs Logins. I then provide one friendly comment on the exact form of the normative question which is central to the view, and suggest that in addition to the question, ‘Why ought S to φ ?’, Logins should take the question, ‘Why is S permitted to φ?’ as definitive of normative reasons. In a more critical comment, I reflect on how normative explanatory reasons and normative reasoning reasons relate, calling into question Logins’s claim that the two kinds of reasons are fundamentally distinct. First, I argue that being a normative explanatory reason near enough guarantees being a normative reasoning reason; second, I argue that normative explanatory reasons as well as normative reasoning reasons can be weighed, and that they can be weighed against each other. But this causes trouble for the Eroteric View.
Bilevel optimization of the Kantorovich problem and its quadratic regularization
(2024-07-14) Hillbrecht, Sebastian; Manns, Paul; Meyer, Christian
This paper is concerned with an optimization problem which is governed by the Kantorovich problem of optimal transport. More precisely, we consider a bilevel optimization problem with the underlying problem being the Kantorovich problem. This task can be reformulated as a mathematical problem with complementarity constraints in the space of regular Borel measures. Because of the non-smoothness that is induced by the complementarity constraints, problems of this type are often regularized, e.g., by an entropic regularization. However, in this paper we apply a quadratic regularization to the Kantorovich problem. By doing so, we are able to drastically reduce its dimension while preserving the sparsity structure of the optimal transportation plan as much as possible. As the title indicates, this is the second part in a series of three papers. While the existence of optimal solutions to both the bilevel Kantorovich problem and its regularized counterpart were shown in the first part, this paper deals with the (weak-) convergence of solutions to the regularized bilevel problem to solutions of the original bilevel Kantorovich problem for vanishing regularization parameters.
Multiscale modelling of thermo-electro-mechanically coupled material behaviour
(2025) Güzel, Dilek; Menzel, Andreas; Pandolfi, Anna; Jänicke, Ralf
This work addresses the multiscale modelling of thermo-electro-mechanically coupled material behaviour, with particular emphasis on the influence of microstructural features such as inclusions, pores and material interfaces. In the first part, a thermodynamically consistent cohesive zone model is developed for electrical conductors subjected to coupled thermo-electro-mechanical loading. Special attention is given to the deformation-induced interface damage processes on the thermal and electrical conductivity. The formulation is validated through an analytical example and demonstrated via a numerical case study involving a wire bonding problem. The second part of the thesis is motivated by non-destructive testing of metals using resistivity measurements. A thermo-electro-mechanically coupled multiscale formulation for electrical conductors in small-strain settings is presented and later extended to explicitly account for material interfaces at the microscale. The proposed framework is illustrated through a series of numerical examples, capturing key features such as size effects and the impact of mechanically induced interfacial degradation. Furthermore, the predictive capabilities of the multiscale model are highlighted, particularly in relation to electrically conductive materials with resistive grain boundaries. In response to long-standing discrepancies in grain boundary resistivity measurements, the thesis revisits the Andrews method and reinterprets it within the proposed multiscale modelling framework using homogenisation theory. This reinterpretation establishes a clear link between measurable macroscopic resistance and microscopic interface behaviour. The final part of the thesis provides a mathematical foundation for the multiscale approach to thermo-electrical homogenisation. Using Hill--Mandel-type homogenisation, asymptotic expansions, and two-scale convergence technique, it is shown that the macroscopic equations governing coupled thermo-electrical behaviour -- previously derived from physical arguments -- can also be rigorously obtained through mathematical homogenisation theory. Overall, the developments in this thesis provide a mathematically and physically consistent basis for the multiscale analysis of thermo-electro-mechanically coupled fields in electrical conductors.
Brücke zwischen Theorie und Praxis: Eine Analyse und Entwicklungsmöglichkeiten der Praktikumsstrukturen in der ingenieurwissenschaftlichen Lehre
(2025-12-01) Nangue Nguimfack, Aline; Haertel, Tobias; Frye, Silke
Practical experience is an essential component of engineering education, as it supports the application of theoretical knowledge in real industrial contexts. This master’s thesis examines the role and effectiveness of internships within the engineering programs at the Technical University of Dortmund. The study focuses on how internships contribute to the transfer between academic learning and practical professional requirements. To explore this, semi-structured interviews were conducted with students, teaching staff, and company representatives. The collected data were analyzed using a qualitative content analysis to identify central themes and recurring patterns across the different perspectives.
The results indicate that internships are widely recognized as valuable learning opportunities that foster technical competencies, workplace understanding, and career orientation. However, the findings also reveal considerable differences in the structure, supervision, and learning outcomes of internship experiences. These variations influence the degree to which internships support meaningful professional development and integration of theoretical knowledge.
Overall, the study highlights the importance of a stronger alignment between academic expectations and practical learning environments. The work contributes to the ongoing discussion on how to enhance the theory-practice relationship in engineering education and provides a basis for further development of internship structures in higher education.