Digitalisierung und Onlinehandel: Fluch oder Segen für ländliche Räume? See

Die Digitalisierung unserer Wirtschaft und Gesellschaft bedingt nicht zuletzt für die Kommunen und den Handel einen tiefgreifenden Umbruch. Mit dem Onlinehandel ist eine Vertriebsform entstanden, die den Einkauf von den Geschäften und Stadtzentren entkoppelt und die in den Kommunen handelnden Akteure vor viele Fragen stellt. Dabei zeichnet sich ab, dass die Auswirkungen des Onlinehandels räumlich nicht neutral sind und insbesondere die Entwicklungsperspektiven ländlicher Räume beeinträchtigt ...

Zusammenhänge zwischen sprachlichen Kompetenzen und mathematischem Lernen vom Vorschulalter bis zum Ende des Grundschulalters unter besonderer Betrachtung des Arbeitsgedächtnisses See

In der Arbeit werden die Zusammenhänge sprachlicher Kompetenzen und mathematischen Lernens unter Berücksichtigung von Arbeitsgedächtniseinflüssen im Zeitraum zwischen Vorschulalter und Ende des Grundschulalters durch vier aufeinander aufbauende Teilstudien untersucht. Zunächst wird betrachtet inwiefern vorschulische Voraussetzungen in den Bereichen Sprache und/oder Mathematik einen Einfluss auf die Entwicklung beider Kompetenzbereiche erhalten (Teilstudie 1). Zudem ist von Interesse, welchen ...

Development of spatial strategies for small island landscapes in the Philippines See

Small islands are among the most fragile and vulnerable yet diverse and unique ecosystems on Earth. This complexity is enhanced by human communities relying on its resources. Understanding small islands therefore, includes analyses of its innate character and the spatial interaction. These ideas form the two-pronged theme of this research including (1) comprehensive profile gap analysis of the small island and (2) its spatial interaction analysis through the natural resources, which provided ...

A new mechanically-interlocked [Pd2L4] cage motif by dimerization of two peptide-based lemniscates See

Most metallo-supramolecular assemblies of low nuclearity adopt simple topologies, with bridging ligands spanning neighboring metal centers in a direct fashion. Here we contribute a new structural motif to the family of host compounds with low metal count (two) that consists of a pair of doubly-interlocked, figure-eight-shaped subunits, also termed “lemniscates”. Each metal is chelated by two chiral bidentate ligands, composed of a peptidic macrocycle that resembles a natural product with two ...

Pivotal tests for relevant differences in the second order dynamics of functional time series See

Motivated by the need to statistically quantify differences between modern (complex) datasets which commonly result as high-resolution measurements of stochastic processes varying over a continuum, we propose novel testing procedures to detect relevant differences between the second order dynamics of two functional time series. In order to take the between-function dynamics into account that characterize this type of functional data, a frequency domain approach is taken. Test statistics are d...

Concentration inequalities in random Schrödinger operators See

Limit theorems and soft edge of freezing random matrix models via dual orthogonal polynomials See

Limit theorems for Bessel and Dunkl processes of large dimensions and free convolutions See

Digitale Lehre der Fakultät Maschinenbau im Sommersemester 2020 See

Im Sommersemester 2020 musste der gesamte hochschulische Lehrbetrieb aufgrund der COVID-19-Pandemie in kürzester Zeit von Präsenz- auf Online-Lehre umgestellt werden. Für Lehrende und Studierende bedeutete dies eine große Umstellung und war mit vielen Herausforderungen verbunden. Im Rahmen dieser Projektarbeit wurde das Angebot digitaler Lehre an der Fakultät Maschinenbau der TU Dortmund im Sommersemester 2020 aus Perspektive der Studierenden untersucht. Ausgehend von einer Übersicht der eing...

Amtliche Mitteilungen der Technischen Universität Dortmund Nr. 24/2020 See

Detection and identification of electrons and photons See

It is important to exploit particle detectors for the detection and identification of electrons and photons in the best possible way, as it is adressed in this thesis by discussing three different application examples of precisely measuring electrons and photons at high-energy physics and test beam experiments. Firstly, the optimization of the photon identification within the ATLAS detector at the LHC is investigated. Appropriate selection criteria are needed to efficiently discriminate pr...

Personalizing human-agent interaction through cognitive models See

Cognitive modeling of human behavior has advanced the understanding of underlying processes in several domains of psychology and cognitive science. In this article, we outline how we expect cognitive modeling to improve comprehension of individual cognitive processes in human-agent interaction and, particularly, human-robot interaction (HRI). We argue that cognitive models offer advantages compared to data-analytical models, specifically for research questions with expressed interest in theor...

Neuartiger CMOS-kompatibler nanostrukturierter Vakuumsensor See

Während Mikro- und Nanosensoren in einigen Sensorkategorien bekanntermaßen seit Jahren zum Stand der Technik gehören und Teil des täglichen Lebens sind, werden im Bereich der Vakuummeter weiterhin überwiegend herkömmliche Sensoren und Messgeräte verwendet. Obwohl zahlreiche wissenschaftliche Arbeiten aus den vergangenen Jahrzehnten die Entwicklung von Mikro- und Nano-Vakuumsensoren thematisieren, haben diese sich bisher noch nicht gegen herkömmliche Messzellen durchgesetzt. In diesem Buch wir...

Complexity of bulk-robust combinatorial optimization problems See

This thesis studies three robust combinatorial optimization problems on graphs. Most robust combinatorial optimization problems assume that the cost of the resources, e.g. edges in a graph, are uncertain. In this thesis, however, we study the so called bulk-robust approach which models the uncertainty in the underlying combinatorial structure. To be more precise, in the bulk-robust model we are given an explicit list of scenarios comprising a set of resources each, which fail if the correspon...

Probabilistic studies on the shear strength of slender steel fiber reinforced concrete structures See

Shear failure is a brittle and undesirable mode of failure in reinforced concrete structures. Many of the existing shear design equations for steel fiber reinforced concrete (SFRC) beams include significant uncertainty due to the failure in accurately predicting the true shear capacity. Given these, adequate quantification and description of model uncertainties considering the systematic variation in the model prediction and measured shear capacity is crucial for reliability-based investigati...

Social evaluation and imitation of prosocial and antisocial agents in infants, children, and adults See

The question of whether infants prefer prosocial agents over antisocial agents is contentious. Therefore, the first goal of the present study was to replicate previous findings regarding infants’ preference. The second goal was to assess whether infants are more likely to imitate a prosocial agent than an antisocial agent. We tested 9-month-old, 14-month-old, and 4-year-old children. The study used the “opening a box to get a toy” paradigm in which an animal puppet is trying unsuccessfully to...

Exchange-mediated magnetic blue-shift of the band-gap energy in the antiferromagnetic semiconductor MnTe See

In magnetic semiconductors the optical spectrum and, in particular, the absorption edge representing the band-gap are strongly affected by the onset of the magnetic order. This contribution to the band-gap energy has hitherto been described theoretically in terms of a Heisenberg Hamiltonian, in which a delocalized conduction carrier is coupled to the localized magnetic moments by the exchange interaction. Such models, however, do not take into account the strong correlations displayed in a wi...

"I heard the News today, oh Boy" See

News-based indicators are in vogue in economics. But they tend to be applied with little consideration for the properties of news itself. In this paper, we try to shed light on the nature of this type of data. Drawing from established findings in communication science and journalism studies we argue that news-based indicators should be taken with a pinch of salt, since news is a somewhat biased representation of political and social reality. Contrary to economics and other social scienc...

Untersuchungen zur Topographie- und Umfangsgestaltoptimierung von Einlippentiefbohrwerkzeugen See

Die zunehmende Elektrifizierung der Automobile sowie die sinkende Nachfrage nach Fahr-zeugen mit Dieselmotoren führen zu einer Steigerung des Kosten- und Fertigungsdrucks in der spanenden Fertigungsbranche. Der Wandel im Automobilsektor sowie der prognostizierte Konjunkturabschwung führen dazu, dass aktuell bestehende Prozesse hinsichtlich der resul-tierenden Fertigungskosten durch eine gezielte Auswahl verschiedener Verfahren zu optimie-ren sind. Zur Gewährleistung einer erfolgreichen Umsetz...