Technische Universität Berlin

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Recent Submissions
Tidal deformation of planets and satellites

Steinbrügge, Gregor (2018)

In this thesis, methods are developed and studied for radar and laser altimetry to measure radial tidal deformations of planets and satellites. The thesis investigates further how the tidal measurement allows constraining the interior structure and rheologic properties of the bodies. A semi-analytical performance model for laser altimetry has been developed to predict probability of false detec...

Magnetische und elektronische Eigenschaften von Übergangsmetallkomplexen in der Gasphase

Bülow, Christine (2018)

In dieser Arbeit wurde der Übergang von einem Hochspin- zu einem Niedrigspinzustand in verschiedenen Systemen mit jeweils einem Übergangsmetallatom mittels Röntgenabsorptions- und XMCD-Spektroskopie in der Gasphase untersucht. Im Vordergrund steht die Frage wie dieser magnetische Übergang von der Anzahl der 3d Elektronen, der Struktur und den Liganden abhängt. Dabei wird von in einem früheren P...

Microbial signatures and quality assessment of Siberian permafrost organic matter for future biogenic greenhouse gas production

Stapel, Janina Gabriele (2018)

The Earth´s high latitude regions, where recent warming has been amplified, are of particular concern in the light of future climate change. Annual average temperatures in the Arctic have risen by 0.6 °C per decade over the last 30 years, and this warming trend resulted into the thaw of perennially frozen ground (permafrost), which exposes substantial amounts of previously frozen organic carbon...

SLRefactor: Ein Refactoring-Ansatz für Simulink-Modelle

Tran, Quang Minh ; Winkler, Jonas Paul ; Dziobek, Christian (2015)

Bei der Funktionsmodellierung ist die Veränderung und Erweiterung der Struktur eines Modells eine häufig durchgeführte Aktivität. Während es bereits Refactoring-Ansätze für textuelle Programmiersprachen wie Java, C# usw. gibt, fehlt ein vergleichbarer, integraler und durchgehender Ansatz für Simulink-Modelle. Wir haben einen automatisierten Refactoring-Ansatz (im Folgenden SLRefactor-Ansatz gen...

Design, control and analysis of a novel multilevel converter with a reduced switch count

Norambuena, Margarita (2018)

Multilevel converters are used in a wide range of applications, such as drives, energy conversion and distributed generation. This Thesis proposes a new multilevel converter topology that allows increasing the number of output voltage levels with a fewer required power semiconductors than in standard multilevel topologies such as Active Neutral Point Clamped (ANPC), Flying Capacitor Converter (...

Automatic glossary term extraction from large-scale requirements specifications

Gemkow, Tim ; Conzelmann, Miro ; Hartig, Kerstin ; Vogelsang, Andreas (2018)

Creating glossaries for large corpora of requirments is an important but expensive task. Glossary term extraction methods often focus on achieving a high recall rate and, therefore, favor linguistic proecssing for extracting glossary term candidates and neglect the benefits from reducing the number of candidates by statistical filter methods. However, especially for large datasets a reduction o...

Microscopic aspects of ageing in Al-Mg-Si alloys

Madanat, Mazen (2018)

Al-Mg-Si alloys with a low solute content (0.4 %Mg, 0.4 %Si) and higher contents (Mg+Si=1.4 %, all in wt.%) were solutionized, quenched and then either artificially aged (AA) at 180 °C or naturally pre-aged (NPA) for 2 weeks at room temperature and then reverse aged (RA) at 250 °C. Subsequently, positron annihilation lifetime spectroscopy was applied with the objective of obtaining information ...

Behagliche Monumentalität in Frankfurt

Enders, Tina (2018)

Bisherige architektursoziologische Ansätze, die den Zusammenhang von Gesellschaft und Architektur aufzuschlüsseln versuchen, beziehen sich in aller Regel nur sehr wenig bis gar nicht auf das direkte bauliche Umfeld und dessen physisch-materiellen Aspekte. Auch der Entstehungsprozess von Architekturen gerät nur selten in den Untersuchungsfokus. Zwar werden regelmäßig soziale Vorgänge in eine dir...

Multidimensional modulation formats for optical transmission systems

Alreesh, Saleem (2018)

The ever-increasing demand for bandwidth is constantly driving deployment of new strategies to enable the upgrading of current optical transmission systems. Therefore, next generation optical networks are required to be elastic and more efficiently utilize the available optical spectrum; this in turn increases spectral efficiency and overall network capacity. To this end, future optical transce...

Verwendung von Krankenhausabrechnungsdaten für die Versorgungsforschung in Deutschland

Nimptsch, Ulrike (2018)

Seitdem die akutstationären Krankenhausleistungen in Deutschland auf der Grundlage des fallpauschalierenden Vergütungssystems der Diagnosis Related Groups (DRG) vergütet werden, sind in den administrativen Datenbeständen der deutschen Krankenhäuser umfassende medizinische Informationen verfügbar. Da die Abrechnung nach dem DRG-System für nahezu alle Patienten und alle Krankenhäuser zur Anwendun...

Design of high performance indium phosphide (InP) - based quantum dot light emitting diodes (QLEDs)

Kim, Yohan (2018)

This dissertation is dedicated to the development and understanding of fundamental device mechanism and engineering of the device architecture of quantum dot light-emitting diodes (QLEDs) based on indium phosphide (InP) quantum dots. QLEDs have emerged as a next-generation flat panel display (FPD) technology with promising properties. Their device performance and fabrication methods are develop...

Property-performance correlations in the oxidative coupling of methane

Wang, Huan (2018)

The oxidative coupling of methane is a “dream reaction” in heterogeneous catalysis to achieve direct conversion for natural gas towards value-added and easily transportable C2 products with high economic relevance. Although extensive academic papers and patents have been reported over the last three decades, no economically viable industrial-scale application is yet achieved because of the limi...

Optimierung der normgerechten Intensitätsbewertung und Untersuchung weiterer Referenzgerüche zur Qualitätssicherung

Brosig, Laura (2018)

For energy saving purposes buildings are constructed increasingly airtight. Due to insufficient ventilation emissions from building materials and products might accumulate indoors. Not only emissions of volatile organic compounds (VOC) may cause impact on health and well-being of occupants but odours as well. Therefore, their perceived intensity can be assessed based on acetone as reference sub...

Die Natur als Vorbild und Partner

Steup, Lara (2018)

Der menschliche Umgang mit den natürlichen Ressourcen der Erde hat dramatische ökologische (und soziale) Folgen: Hierzu gehören der Klimawandel, der degradierte Zustand unserer Ökosysteme sowie der damit einhergehende hohe Verlust der Biodiversität. Trotz aller Bemühungen um eine nachhaltige Entwicklung konnte in diesen Bereichen bisher keine Trendwende erzielt werden. Der Wissenschaftliche Bei...

Enzymes as modular catalysts for redox halfreactions in H2-powered chemical synthesis: from biology to technology

Reeve, Holly A. ; Ash, Philip A. ; Park, HyunSeo ; Huang, Ailun ; Posidias, Michalis ; Tomlinson, Chloe ; Lenz, Oliver ; Vincent, Kylie A. (2017-01-06)

The present study considers the ways in which redox enzyme modules are coupled in living cells for linking reductive and oxidative half-reactions, and then reviews examples in which this concept can be exploited technologically in applications of coupled enzyme pairs. We discuss many examples in which enzymes are interfaced with electronically conductive particles to build up heterogeneous cata...

Facile Control over the Supramolecular Ordering of Selfassembled Peptide Scaffolds by Simultaneous Assembly with a Polysacharride

Li, Rui ; Boyd-Moss, Mitchell ; Long, Benjamin ; Martel, Anne ; Parnell, Andrew ; Dennison, Andrew J. C. ; Barrow, Colin J. ; Nisbet, David R. ; Williams, Richard J. (2017-07-06)

Enabling control over macromolecular ordering and the spatial distribution of structures formed via the mechanisms of molecular self-assembly is a challenge that could yield a range of new functional materials. In particular, using the self-assembly of minimalist peptides, to drive the incorporation of large complex molecules will allow a functionalization strategy for the next generation of bi...

Research Information Standards Adoption

Riechert, Mathias ; Roberson, Owen ; Wastl, Jürgen (2017-03-21)

While Research Information continues to mature as an area of expertise, discussions regarding the implementation and adoption of standardisation initiatives, such as CASRAI and CERIF, have intensified. Possessing the capacity to use a standard does not obligate its adoption, so the extent to which standards are employed varies across use cases and institutions, in a way that is difficult to qua...

Enantioselektive Reduktionen mit Ru–S-Komplexen und Untersuchung der zugrundeliegenden Mechanismen

Bähr, Susanne (2018)

Die vorliegende Dissertation widmet sich der Synthese und Charakterisierung chiraler, kationischer Ruthenium(II)-Thiolatkomplexe und deren Anwendung in enantioselektiven Reduktionen. Die Aufklärung der Mechanismen dieser katalytischen Umsetzungen ist ein weiterer Schwerpunkt. Der erste Teil der Arbeit besteht in der mechanistischen Aufklärung der zuvor entwickelten 1,4-Hydrosilylierung von Py...

Optical interactions for internal signal tracking in ICs

Vogt, Ivo (2018)

This work investigates and improves two common techniques of electronics failure analysis, (spectral) photon emission microscopy (PEM/SPEM) and electro-optical frequency mapping (EOFM). The scientific focus is set on the physical interaction between light and an active semiconductor device. Investigated test structures include 14-40nm FinFETs of several technology generations, as well as planar...

Design of vehicle system dynamics using solution spaces

Eichstetter, Markus (2018)

The automotive industry is looking for an efficient product development process to offer a large diversity of high quality products while reducing development costs. An efficient product development process can be created by shifting many aspects of development into the virtual world. This work describes three contributions to a systematic virtual development process: first, a method to derive ...