Fakultät 2 Mathematik und Naturwissenschaften
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1501 Submissions in this community.

Recent Submissions
Synthesis, characterization and catalytic testing of metal tungstates as catalysts for activation of lower alkanes

Li, Xuan (2017)

The electronic and structural properties of vanadium-containing phases govern the formation of isolated active sites at the surface of these catalysts for selective alkane oxidation. This concept i...

In situ observation of reactive oxygen species forming on oxygen-evolving iridium surfaces

Pfeifer, Verena; Jones, Travis E.; Velasco Vélez, Juan J.; Arrigo, Rosa; Piccinin, Simone; Hävecker, Michael; Knop-Gericke, Axel; Schlögl, Robert (2017)

Water splitting performed in acidic media relies on the exceptional performance of iridium-based materials to catalyze the oxygen evolution reaction (OER). In the present work, we use in situ X-ray...

Reactive oxygen species in iridium-based OER catalysts

Pfeifer, Verena; Jones, Travis E.; Wrabetz, Sabine; Massué, Cyriac; Velasco Vélez, Juan J.; Arrigo, Rosa; Scherzer, Michael; Piccinin, Simone; Hävecker, Michael; Knop-Gericke, Axel; Schlögl, Robert (2016)

Tremendous effort has been devoted towards elucidating the fundamental reasons for the higher activity of hydrated amorphous IrIII/IV oxyhydroxides (IrOx) in the oxygen evolution reaction (OER) in ...

What makes Xanthomonas albilineans unique amongst xanthomonads?

Pieretti, Isabelle; Pesic, Alexander; Petras, Daniel; Royer, Monique; Süssmuth, Roderich D.; Cociancich, Stéphane (2015)

Xanthomonas albilineans causes leaf scald, a lethal disease of sugarcane. Compared to other species of Xanthomonas, X. albilineans exhibits distinctive pathogenic mechanisms, ecology and taxonomy. ...

Mathematical optimization of rolling stock rotations

Reuther, Markus (2017)

We show how to optimize rolling stock rotations that are required for the operation of a passenger timetable. The underlying mathematical ptimization problem is called rolling stock rotation proble...

Identification of reactive oxygen species in iridium-based OER catalysts by in situ photoemission and absorption spectroscopy

Pfeifer, Verena (2017)

A change in our energy supply from fossil fuels to intermittent renewables requires energy storage capacity. Part of this capacity may be delivered from chemical energy conversion relying on H2 as ...

Active emulsion droplets driven by Marangoni flow

Schmitt, Maximilian (2017)

Diese Forschungarbeit beinhaltet Theorie und Simulation aktiver Emulsionstropfen, die aufgrund einer inhomogenen Oberflächenspannung auf ihrer Grenzfläche schwimmen. Der zugrundeliegende Effekt hei...

On some aspects of recovery of sparse signals in high dimensions from nonlinear measurements using compressed sensing

Kolleck, Anton (2017)

In data processing we often aim for the recovery of signals in very high dimensions from linear measurements. In many applications such as medical imaging, it turns out that the signal of interest ...

Entwicklung eines neuartigen kryogenen 22-Pol Ionenfallenspektrometers (BerlinTrap) und spektroskopische Analyse von isolierten Flavinionenkomplexen

Günther, Alan (2017)

Diese Dissertation beschäftigt sich mit der spektroskopischen Untersuchung biologisch relevanter Flavinmoleküle in der Gasphase. Experimentelle Ergebnisse, unterstützt durch quantenchemische Rechnu...

Noble metal nanoparticles supported in ordered mesoporous carbon coatings as efficient electrocatalysts for the hydrogen evolution reaction

Bernsmeier, Denis Robert (2017)

Hydrogen has the highest gravimetric energy density of all chemical substances. Accordingly, hydrogen is a promising candidate as a fuel or for energy storage. One efficient way to produce hydrogen...

Sugar surfactant based microemulsions at solid surfaces

Vargas Ruiz, Salome (2017)

This study investigates the structural properties of sugar surfactant-based microemulsions at solid-liquid interfaces. In particular, this thesis attempts to correlate these structural properties a...

Cover graphs and order dimension

Wiechert, Veit (2017)

The goal of this dissertation is to study the various connections between the dimension of posets and graph theoretic properties of their cover graphs. We are particularly interested in properties ...

CO2 utilisation today : report 2017

Tzimas, Evangelos; Leitner, Walter; Arlt, Wolfgang; Styring, Peter; Arning, Katrin; Ziefle, Martina; Meys, Raoul; Kätelhön, Arne; Bardow, André; Castillo Castillo, Arturo; Flanders, Nicholas; Marinić, Saša; Mechnig, Stefan-Paul (2017)

This report provides perspectives on CO2 utilisation from a variety of angles: interviews with scientists, essays on business, environment and social impact, as well as stories from CO2-utilising c...

Dense colloidal suspensions in microchannel flow

Kanehl, Philipp (2017)

Kolloidale Suspensionen im Scherrfluss migrieren in Richtung kleiner Scherrate. Suspensionen mit zwei verschiedenen Teilchengrößen entmischen sich im Zentrum eines Mikrokanals. Kolloide in Kanälen ...

Vibrational properties of low-dimensional inorganic layered materials

Staiger, Matthias (2017)

The family of low-dimensional inorganic layered materials covers a wide spectrum of properties, structurally and electronically. Ever since their synthesis as nanotubes and their preparation as mon...

Oxidative coupling of methane

Fleischer, Vinzenz (2017)

Nowadays, ethene is produced through steam cracking of naptha, which is a fraction of crude oil obtained after its distillation. Ethene is an important basic chemical for the chemical industry, but...

Processing, structuring, and switching of microporous polymers

Becker, Daniel (2017)

This work presents results from three different topics that stand independent from each other. If one wants to find a common denominator connecting all these topics it might be porosity. Whereas th...

On superradiant phase transitions in generalised Dicke models

Hayn, Mathias (2017)

In this doctoral thesis, the thermodynamic phases und phase transitions of a generalised Dicke model are studied and characterised. Both, finite and vanishing temperatures are considered. The Dic...

Relativistic laser plasma dynamics with ultrathin foils

Bränzel, Julia (2017)

This thesis investigated the fundamental interaction processes of laser pulses of relativistic intensity interacting with dense plasmas, created from ultrathin foils. These processes include, ion a...

Development and analysis of all diode laser ns-MOPA systems for high peak power applications

Vu, Thi Nghiem (2017)

The aim of this work is to design and characterize all-diode laser based master oscillator power amplifier (MOPA) systems, which operate in the ns-pulse region with peak powers in the range of more...