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Doctoral thesis (179)
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319 documents, page 1 of 32

Struktur und Magnetismus von Ferrocen und ferrocenhaltigen Polymeren in dünnen Filmen

Ferrocen ist ein organometallischer Sandwichkomplex, der aus zwei Cyclopentadienylringen besteht, welche um ein Eisenatom koordiniert sind. Die besondere Eigenschaft des metallischen Kerns besteht in der Möglichkeit eine paramagnetische Suszeptibilität durch Oxidation von Fe 2+ zu Fe 3+ auszubilden. Ziel dieser Arbeit ist es, den Einfluss der Struktur verschiedener ferrocenhaltiger Moleküle auf diese magnetische Suszeptibilität zu untersuchen. Im Zentrum der Untersuchung stehen dabei Ferro...

Studies on Boron-Carbon-Nitrides (B-C-N) Leading to the Discovery of the Novel Boron Oxynitride B6N4O3

The present thesis deals with studies on boron-carbon-nitrides (B-C-N) and with the discovery of a novel boron oxynitride (B-O-N) phase. Polymer-derived amorphous B-C-N compounds are studied under high-pressure and high temperature (HP-HT) conditions in order to investigate the formability of crystalline ternary B-C-N phases. Furthermore, the potential capability of amorphous B-C-N compounds for their electrochemical performance as promising anode materials for Li-ion battery (LIB) is evaluat...

Untersuchung der Verdampfung aus strukturierten Oberflächen in Reinstoffatmosphäre

Unser Alltag ist geprägt durch eine Vielzahl elektronischer Geräte, welche stetig kleiner und leistungsfähiger werden. Verbunden mit der zunehmenden Leistungsdichte ist der wachsende Bedarf an effizienten Wärmeübertragungstechniken zur Fortsetzung dieser Entwicklung. Für die Übertragung hoher Wärmestromdichten hat sich in den letzten Jahren zunehmend der Verdampfungsprozess etabliert, welcher die hohe, an den Phasenwechsel gebundene Energiemenge ausnutzt. Ein Anwendungsbeispiel dieses Prozess...

Electrons from decays of open charm and beauty hadrons in p-Pb collisions at sqrt(sNN) = 5.02 TeV

Charm and beauty quarks serve as a probe to study the deconfined medium of a quark-gluon plasma observed in A-A collisions. Due to their large mass they are produced in the first moments of the collision and interact with the expanding medium. Cold nuclear matter effects such as the modification of the nuclear Parton Distribution Functions in the Pb nuclei, parton momentum (k_T) broadening from soft scattering processes and initial- and final-state parton energy loss play a role in nuclear co...

Machine Learning through Exploration for Perception-Driven Robotics

The ability of robots to perform tasks in human environments has largely been limited to rather simple and specific tasks, such as lawn mowing and vacuum cleaning. As such, current robots are far away from the robot butlers, assistants, and housekeepers that are depicted in science fiction movies. Part of this gap can be explained by the fact that human environments are hugely varied, complex and unstructured. For example, the homes that a domestic robot might end up in ar...

Strommessung in einer vernetzten Welt. Entwicklung minimalinvasiver Methoden zur feingranularen Approximation von Stromflüssen in intelligenten Umgebungen

Bestehende vernetzte Stromzähler zur Erfassung der bezogenen elektrischen Arbeit sind zur Erstellung von Energiebedarfsanalysen ungeeignet. Zum einen wird die bezogene elektrische Arbeit lediglich mit einer niedrigen Abtastrate erhoben und zum anderen erfolgt keine Erfassung von Kontextdaten zu aktiven Verbrauchern. Daher erlaubt die alleinige Betrachtung von Energiedaten kaum Rückschlüsse auf die eigentlichen Ursachen des Energiebedarfs. Diese Intransparenz stellt sowohl für P...

Quantitative Analysis of Iterative Algorithms in Fixed Point Theory and Convex Optimization

The ongoing program of `proof mining' aims to extract new, quantitative information in the form of bounds and rates from prima facie noneffective proofs in mathematics. In doing so, proof mining and the thesis at hand draws a bridge between mathematics and logic, prompting a lively interaction between mathematical practice and logical theory. This thesis applies proof mining paradigms to several convergence results in fixed point theory and nonlinear optimization, resulting in new complexity ...

Improving Quality of Service in Wireless Sensor Networks for Industrial Automation

Monitoring and control systems have played a central role in industry and everyday life, often in a non-intrusive manner. Yet, they will become more ubiquitous, autonomous and distributed, with the rapid development of the envisioned technologies of "smart homes", "smart cities" and "industry 4.0". All these new technologies are built upon the enabling technology of WSN. Their success depends to a large extent on the communication capability of WSNs. Fast reaction and feedback is a common cha...

Robust Adaptation and Learning Over Networks

This doctoral dissertation centers on robust adaptive networks. Robust adaptation strategies are devised to solve typical network inference tasks such as estimation and detection in a decentralized manner in the presence of impulsive contamination. Typical in wireless communication environments, an impulsive noise process can be described as one whose realizations contain sparse, random samples of amplitude much higher than nominally accounted for. An attractive feature that these robust adap...