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  • Geschäftsordnung des Hochschulrats der Technischen Universität Dortmund vom 17. Januar 2020,Amtliche Mitteilungen der Technischen Universität Dortmund;2020;5,
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  • Brandschutzordnung für die Technische Universität Dortmund gemäß DIN 14096,Amtliche Mitteilungen der Technischen Universität Dortmund;2020, 2,
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  • Regeln guter wissenschaftlicher Praxis an der Technischen Universität Dortmund [Stand: 12.12.2019],Amtliche Mitteilungen der Technischen Universität Dortmund;2020,6,
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  • As negative impacts of climate change tend to increase in the future, densely-populated cities especially need to take action on being robust against natural hazards. Consequently, there is a growing interest from scientists in measuring the climate resilience of cities and regions. However, current measurements are usually assessed on administrative levels, not covering potential hotspots of hazardous or sensitive areas. The main aim of this paper focusses on the measurement of climate resilience in the City of Dortmund, Germany, using Geographic Information Systems (GIS). Based on a literature review, we identified five essential components of climate resilience and initially designed a theoretical framework of 18 indicators. Since climate resilience is still a vague concept in scientific discourses, we implemented local expert knowledge and fuzzy logic modelling into our analysis. The benefit of this study not only lies in the fine-scale application, but also in the relevance for multiple disciplines by integrating social and ecological factors. We conclude that climate resilience varies within the city pattern, with the urban core tending to be less resilient than its surrounding districts. As almost the entire geodata set used is freely available, the presented indicators and methods are to a certain degree applicable to comparable cities.,Sustainability;12(2),
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  • The paper is concerned with an optimal control problem governed by the rate-independent system of quasi-static perfect elasto-plasticity. The objective is optimize the displacement field in the domain occupied by the body by means of prescribed Dirichlet boundary data, which serve as control variables. The arising optimization problem is nonsmooth for several reasons, in particular, since the control-to-state mapping is not single-valued. We therefore apply a Yosida regularization to obtain a single-valued control-to-state operator. Beside the existence of optimal solutions, their approximation by means of this regularization approach is the main subject of this work. It turns out that a so-called reverse approximation guaranteeing the existence of a suitable recovery sequence can only be shown under an additional smoothness assumption on at least one optimal solution.,Ergebnisberichte des Instituts für Angewandte Mathematik;627,
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  • In this thesis we are dealing with the estimation of parameters under shifts in the mean. The results of this work are based on three articles. The first main chapter of this thesis presents estimation methods for the LRD parameter under shifts in the mean. In the context of long range dependent (LRD) stochastic processes the main task is estimation of the Hurst parameter H, which describes the strength of dependence. When data are contaminated by level shifts ordinary estimators of H, such as the Geweke and Porter-Hudak (GPH) estimator, may fail to distinguish between LRD and structural changes, such as jumps in the mean. As a consequence, the estimator may suffer from positive bias and overestimate the intensity of the LRD. This fact is e.g. a major issue when testing for changes in the mean. To overcome this problem, we propose to segregate the sample of size N into blocks and then to estimate H on each block separately. Estimates, calculated in different blocks, are then combined and a final estimate of the Hurst parameter is obtained. We investigate several possibilities of segregating the data and assess their performance in a simulation study. One possibility is segregation into two blocks. The position at which the data are separated into two parts is either estimated using the Wilcoxon change-point test or chosen at any point, yielding estimates, which are combined by averaging. Another possibility is dividing the sequence of observations into many overlapping or non-overlapping blocks and estimating H by averaging estimates from these blocks. In the presence of one or even several jumps this procedure performs well in simulations. When dealing with processes with long memory and short range dependence, such as the fractionally integrated ARMA process (ARFIMA), the proposed estimators do not yield desirable results. Therefore, we follow an ARMA correction procedure and estimate the Hurst parameter in several recursive steps, using the overlapping or the non-overlapping blocks approach. In the context of LRD we observe that segregation into many blocks improves the ordinary estimators of H considerably under abrupt changes in the mean. We follow this same idea of segregation to estimate the variance of independent or weakly dependent processes under level shifts. The second main chapter of this thesis deals with scale estimation under shifts in the mean. When dealing with a few level shifts in finite samples we propose usage of the ordinary average of sample variances, obtained from many non-overlapping blocks. Under some conditions on the number of change-points and the number of blocks we prove strong consistency and asymptotic normality for independent data, where full asymptotic efficiency compared to the ordinary sample variance is shown. For weakly correlated processes we prove weak consistency of the blocks estimator. This estimator performs well when the number of level shifts is moderately low. In the presence of many level shifts even better results are obtained by an adaptive trimmed mean of the sample variances from non-overlapping blocks. The fraction of trimmed blockwise estimates is chosen adaptively, where extraordinary high sample variances are removed before calculating the average value. Even though this procedure is developed under the assumption of independence, it performs well also under weak dependence, e.g. when dealing with AR processes. If the data are additionally contaminated by outliers the proposed estimators fail to estimate the variance properly, since they are not robust. Therefore, we investigate a modified version of the well-known median absolute deviation (MAD) to account for both sources of contamination - level shifts and outliers. The formula of the MAD involves the sample median, which is not a good estimator of location in the presence of level shifts. Our proposal is to calculate the sample median in non-overlapping blocks and to consider absolute differences involving blockwise medians instead of a single median calculated on the whole sample. In this way only some blocks are affected by level shifts and the resulting modified MAD is robust against outliers and level shifts simultaneously. We proved strong consistency and asymptotic normality for independent random variables under some conditions on the number of change-points and the number of blocks. The Bahadur representation of the proposed estimator is shown to be the same as in the case of the ordinary MAD, resulting in the same asymptotic variance. In a simulation study the modified MAD provides very good results. The proposed estimator performs well as compared to other robust methods, which are discussed for comparison, in many simulation scenarios.
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  • For process development on lab‐scale, it is necessary to have equipment that represents the industrial apparatuses as similar as possible to offer short time‐to‐market. Accordingly, a draft tube baffle (DTB) crystallizer was scaled down from typical m3‐scale to 1 L filling volume. The suspension characteristics were determined for fluidized crystals in saturated solution. For further characterization of the DTB tank, the residence time of the liquid and solid phases were experimentally determined for the continuous operation mode. Additionally, the classifying behavior of the particles in the DTB was investigated.,Chemie Ingenieur Technik;Vol. 92. 2020, Issue 3, 288-294,
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  • Due to their high strength-to-weight-ratio, magnesium alloys are very attractive for use in automotive engineering. For application at elevated temperatures, the alloys must be creep-resistant. Therefore, the influence of the operating temperature on the material properties under quasistatic and cyclic load has to be understood. A previous study investigated tensile-tensile fatigue behavior of the magnesium alloys DieMag422 and AE42 at room temperature (RT). The aim of this study was the comparison of both alloys regarding compression, tensile, and compression-compression fatigue behavior. The quasistatic behavior was determined by means of tensile and compression tests, and the tensile-compression asymmetry was analyzed. In temperature increase fatigue tests (TIFT) and constant amplitude tests (CAT), the temperature influence on the cyclic creeping (ratcheting) behavior was investigated, and mechanisms-relevant test temperatures were determined. Furthermore, characteristic fracture mechanisms were evaluated with investigations of the microstructure and the fracture surfaces. The initial material was analyzed in computed tomographic scans and energy dispersive X-ray (EDX) analyses.,Materials;13(3),
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  • Fächerspezifische Bestimmungen an der Technischen Universität Dortmund für das Unterrichtsfach Englisch für ein Lehramt an Haupt-, Real-, Sekundar- und Gesamtschulen zur Prüfungsordnung für die Lehramtsbachelorstudiengänge,Fächerspezifische Bestimmungen an der Technischen Universität Dortmund für das Unterrichtsfach Englisch für ein Lehramt an Haupt-, Real-, Sekundar- und Gesamtschulen zur Prüfungsordnung für die Lehramtsmasterstudiengänge,Fächerspezifische Bestimmungen an der Technischen Universität Dortmund für das Unterrichtsfach Englisch für ein Lehramt an Gymnasien und Gesamtschulen zur Prüfungsordnung für die Lehramtsbachelorstudiengänge,Fächerspezifische Bestimmungen an der Technischen Universität Dortmund für das Unterrichtsfach Englisch für ein Lehramt an Gymnasien und Gesamtschulen zur Prüfungsordnung für die Lehramtsmasterstudiengänge,Fächerspezifische Bestimmungen an der Technischen Universität Dortmund für das Unterrichtsfach Englisch für ein Lehramt an Berufskollegs zur Prüfungsordnung für die Lehramtsbachelorstudiengänge,Fächerspezifische Bestimmungen an der Technischen Universität Dortmund für das Unterrichtsfach Englisch für ein Lehramt an Berufskollegs zur Prüfungsordnung für die Lehramtsmasterstudiengänge,Amtliche Mitteilungen der Technischen Universität Dortmund;2020,3,
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  • Fostering entrepreneurship and inclusive societies are on top of EU policy agenda. This article is bringing together both aims by discussing a social innovation framework for inclusive entrepreneurial education for persons with disabilities. Similar to other disadvantaged groups, persons with disabilities can benefit from entrepreneurial skills for self-management or, on a next level, for starting own, opportunity-driven businesses. The framework suggests several building blocks considered necessary for successful entrepreneurial education for the beneficiaries. First, it is approaching the framework through a social innovation perspective. In doing so, it suggests a social innovation ecosystem perspective to operationalize all relevant stakeholders and contextual aspects relevant for the framework. Second, it suggests to build on socially innovative, hence novel, practices by starting from co-creation and co-production in order to meet individual demands and needs of learners. Furthermore, it takes the concept of universal design into account as it holds major implications for inclusive entrepreneurial education for persons with disabilities and underlines the need of different, more suitable practices in entrepreneurship education and beyond, toward an inclusive learning ecosystem.,Front. Educ.;5,
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