Technische Universität Berlin

6491 Items

Recent Submissions
Stochastisches Verfahren zur Simulation von Breitbandschall in Triebwerkfans

Wohlbrandt, Attila (2017)

Die vorliegende Arbeit beschäftigt sich mit der Anwendung des Random-Particle-Mesh-Verfahrens (RPM) zur Simulation von Fanbreitbandschall. Aus zeitgemittelten, turbulenten Größen erzeugt das Verfahren zeitabhängige Fluktuationen, die zur Vorhersage der Schallentstehung hinreichend sind. Es wird isotrope, freie Turbulenz in Form von divergenzfreien Geschwindigkeitsfluktuationen synthetisiert. D...

Tribologisch induzierte Oberflächenveränderungen im Reib-Verschleiß-Kontakt Kolbenring gegen Zylinderlaufbahn

Biberger, Julian (2017)

In Verbrennungsmotoren ist der Tribokontakt Topring gegen Zylinderlaufbahn einer der am höchsten beanspruchten Kontakte. Die Anforderungen an Reibungsoptimierung und geringen Verschleiß bei gleichzeitig hoher Laufzeit erfordern ein detailliertes Verständnis dieses tribologischen Kontaktes. Aus diesem Grund ist es erforderlich, unterschiedliche Kolbenringbeschichtungen auf ihr tribologisches Ver...

Proteome characterization of Escherichia coli cells evolved to tolerate elongation factor P deletion

Wang, Mingjian (2017)

Elongation factor P (EF-P) is an essential translation factor in bacteria, it has been reported that EF-P plays an important role in rescuing the translation stalling caused by the oligo-proline containing peptides stretch. The growth rate of E. coli was significantly restricted when EF-P was knocked out. However, through a continuous directed evolution in the turbidostatic model, both the wild...

Flashback prevention in lean-premixed hydrogen combustion

Reichel, Thoralf G. (2017)

The focus of this study is the combustion of hydrogen in air as it relates to typical gas turbine engines. Hydrogen–air combustion occurs in the absence of any carbon-based emissions and the only combustion products are water vapor and oxides of nitrogen (NOx). However, due to the very low flammability limit of hydrogen, it can be burned at much lower equivalence ratios than typical hydrocarbon...

Computer vision and computer algebra

Wagner, André (2017)

In Multiview-Geometrie, einem Teilgebiet der Computer-Vision, werden Bilder mit Kameras von 3D-Objekten aus verschiedenen Perspektiven aufgenommen. Diese Arbeit studiert Multiview-Geometrie mit Methoden aus der Computer-Algebra. Hauptprobleme des Maschinellen Sehens sind die Objektrekonstruktion und die Bestimmung der Kameraparameter. In diesen beiden fundamentalen Fragestellungen erzielen wir ...

Systematic coalescence investigations in liquid/liquid systems

Kamp, Johannes (2017)

Liquid/liquid dispersions, which are mixtures of (nearly) immiscible liquids, are an integral part of many technical processes and everyday consumer products. For example, in technical processes the interfacial area is increased by dispersion to enhance mass and heat transfer; or consumer products like lotions and creams consist of stabilised oil/water dispersions. The process efficiency and re...

The random conductance model under degenerate conditions

Nguyen, Tuan Anh (2017)

Random motions in random media is an interesting topic that has been studied intensively since several decades. Although these models are relatively simple mathematical objects, they have a wide variety of interesting properties from the theoretical point of view. In this dissertation, we study an important branch within this topic, namely reversible random walks moving among nearest neighbo...

Identical emitters, collective effects and dissipation in quantum optics

Gegg, Michael (2017)

In this thesis a formalism for indistinguishable multi-level quantum emitters in quantum master equations is developed. The complexity of the approach scales only polynomially in the number of quantum emitters. Complexity here means the number of coupled equations or rather the dimension of the Liouville space. This approach opens new possibilities for calculating open quantum systems. The meth...

Bor-Lewis-Säure-katalysierte Aktivierung von substituierten Cyclohexa-1,4-dienen: Anwendungen als Transferreagenzien in der Synthesechemie

Keeß, Sebastian (2017)

Die vorliegende Arbeit widmet sich der Entwicklung geeignet substituierter Cyclohexa-1,4-diene und deren Anwendung als sicher handhabbare Ersatzstoffe für als Reinsubstanz gefährliche Chemikalien in Lewis-Säure-katalysierten Transferreaktionen. Im ersten Teil dieser Dissertation wurde im Rahmen einer systematischen Untersuchung der Einfluss verschiedener Faktoren auf die im Jahr 2013 von Simonn...

From axenic to mixed cultures: technological advances accelerating a paradigm shift in microbiology

Meyer, Vera ; Nai, Corrado (2017)

Since the onset of microbiology in the late 19th century, scientists have been growing microorganisms almost exclusively as pure cultures, resulting in a limited and biased view of the microbial world. Only a paradigm shift in cultivation techniques – from axenic to mixed cultures – can allow a full comprehension of the (chemical) communication of microorganisms, with profound consequences for ...

Gefäßsteifigkeitsmessung als Screening-Verfahren zur verbesserten Beurteilung des kardiovaskulären Risikos

Karczewski, Tina (2017)

In 2003 the ESH/ESC recommended the arterial stiffness measurement for arterial hypertension management in their guidelines for the first time. In addition to the conventional blood pressure measurement, the clinicians are advised to measure following parameters: pulse wave velocity (PWV), augmentation pressure (AugP) and central blood pressure (zBD). A change in shape of the blood pressure wav...

Die Schädigung des unreifen Kleinhirns durch Hyperoxie in Ratten als Modell der Hirnschädigung bei Frühgeborenen

Scheuer, Till (2017)

Former preterm infants often suffer from impaired postnatal brain development. In general, brain injury is reported to be caused by hypoxia/ischemia, infection/inflammation and hyperoxia. Due to recent insights, pathologies of the cerebellum can often be found, too. Preterm birth seems to be associated with a reduction of the cerebellar volume and decreased cell density in the cerebellar cortex...

Radio over fibre techniques for backhaul and fronthaul

Gomes dos Santos, Jessé (2017)

The 5th generation of the mobile network, foreseen to work commercially from 2020, promises to offer significant improvements when compared to previous mobile generations. Among these advances, the minimum experienced user throughput in uplink 50 [Mbps] and downlink 100 [Mbps] stands out. Such new requirements will lead to an exponential growth of aggregation network traffic. To address such th...

Entwicklung von HPLC-MS/MS-Methoden zum Nachweis von proteinbasierten Bindungssystemen in Fleisch und Fleischerzeugnissen

Jira, Wolfgang (2017)

Im Rahmen der vorliegenden Arbeit wurden auf Basis der Kopplung von Hochleistungsflüssigchromatographie und Tandem-Massenspektrometrie (HPLC-MS/MS) basierende Methoden zum Nachweis des Einsatzes der marktrelevanten proteinbasierten Bindungssysteme mikrobielle Transglutaminase (TG) und Fibrinogen/Thrombin (FT) von Rind und Schwein bei Fleisch und rohen Fleischerzeugnissen entwickelt. Für die Er...

Production of extracellular DNA (eDNA) of the γ-Proteobacterium Rheinheimera sp. F8 in biofilms

Schuster, Anna-Kathrin (2017)

Abstract F8 is a gram-negative γ-Proteobacterium, which belongs to the genus Rheinheimera. The strain has been isolated from the South Saskatchewan River in Canada (Böckelmann, 2002). It has been discovered in previous studies that F8 releases DNA into the extracellular space (Böckelmann et al., 2006; Böckelmann et al., 2007). The aim of this study was a more detailed analysis of the F8 extrace...

Coupling of continuum mechanics and electrodynamics

Reich, Felix Alexander (2017)

In the literature, many models of electromagnetic momentum are proposed. Each model implies a form of the electromagnetic force density, which acts as a source in the mechanical momentum balance. The debate as to which model of the electromagnetic force is "correct" for arbitrary materials and processes is ongoing. Most authors argue in favor or against specific models by virtue of thought expe...

Wutreden – Konstruktion einer Gattung in den digitalen Medien

Meier, Simon (2016)

This paper proposes a reception-oriented and discursive concept of genre by using the example of „Wutreden“, i. e. public and medially distributed rants and their coverage in (online) media and Web 2.0. On the basis of a corpus of video recordings and transcriptions of Wutreden as well as comments made by journalists and users, it is shown that neither their linguistic features nor their situat...

Angemessenheit. Pragmatische Perspektiven auf ein linguistisches Bewertungskriterium

Meier, Simon (2015)

null

Post-modernism, post-structuralism, post-semiotics? Sign theory at the fin de siècle

Posner, Roland (2011)

The contribution describes the differences between modernism and postmodernism as historical periods of the twentieth century and establishes comparable differences between structuralism and post-structuralism as semiotic approaches. Like modernism, structuralism rejects traditional modes of thought, attempts to reconstruct academic disciplines on the basis of a few fundamental principles and s...

Power in society, economy, and mentality: Towards a semiotic theory of power

Siefkes, Martin (2010)

It is a well-known fact that power is closely connected with signs, but usually this connection is thought to be “after the fact”: signs representing a power whose origin could be understood in non-semiotic terms. In this paper, a different view is introduced: power is an inherently semiotic phenomenon, which can be analyzed with concepts of cultural semiotics. To reach this aim, the three area...