Browsing Naturwissenschaften, Mathematik und Informatik by Title
Now showing items 5064-5083 of 5496
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Ueber die Funktion von Zinkfinger Proteinen bei der Induktion des Mesoderms in Xenopus laevis
(2001-12-10)Mesoderm induction and dorsal-ventral patterning in vertebrates and invertebrates involves signalli ng by members of the transforming growth factor-beta (TGF-beta) superfamily cytokines. ... -
Ultra-low Energy Ion Implantation into Graphene
(2023-11-03)This thesis explores the advancement of ultra-low energy (ULE) ion implantation as a method for precisely doping of graphene, with the aim of tailoring its properties for specific applications. The incorporation of impurity ... -
Ultrafast electron dynamics measured with a novel time-resolved high-repetition rate momentum microscopy setup
(2021-03-25)In this thesis, a new generation of a trARPES experiment has been successfully built up from scratch combining the advantages of a ToF momentum microscope with a lab-based HHG source, delivering femtosecond EUV pulses, ... -
Ultrafast Lorentz Microscopy using High-Coherence Electron Pulses
(2019-05-08)Information processing and storage applications demand increasing miniaturization and operation speeds, where optical manipulation of magnetic order may play a very important role. It is hence essential to study how light ... -
Ultrafast low-energy electron diffraction at surfaces
(2019-02-22)Due to their reduced dimensionality, surfaces and quasi two-dimensional materials exhibit numerous intriguing physical phenomena that drastically differ from the bulk. To resolve these effects and the associated dynamics ... -
Ultrafast momentum microscopy of dark exciton dynamics in real- and reciprocal-space
(2023-12-22)Combining both worlds of momentum and real-space time-resolved momentum microscopy, this thesis introduces a new approach to probe the entire exciton landscape and dynamics of twisted TMD heterostructures with momentum-, ... -
Ultrafast photoelectron spectroscopy near liquid water interfaces: The solvated electron
(2010-08-24)The nature of the solvated electron, which was first observed in liquid ammonia in 1864, continues to pose fundamental problems. In liquid water, the hydrated electron is essential to many ... -
Ultrafast Probing and Coherent Vibrational Control of a Surface Structural Phase Transition
(2021-08-26)The present thesis explores the coherent control of surface structural phase transitions by all-optical manipulation of key vibrational modes. To this end, ultrafast low-energy electron diffraction (ULEED) in combination ... -
Ultrafast spin dynamics in FeNi alloys
(2023-11-17)In this thesis, the optical intersite spin transfer in ferromagnetic FeNi alloys is studied on the femtosecond timescale. Extreme ultraviolet transverse magneto-optical Kerr effect spectroscopy (EUV T-MOKE) is used to ... -
Ultrafast transmission electron microscopy of a structural phase transition
(2021-08-09)High hopes are placed on materials with tunable properties and excitations for future applications in energy conversion devices. Functionality of devices, however, not only arises from the properties of individual materials ... -
Ultraschallabsorptionsspektroskopie zur Untersuchung schneller molekularer Prozesse in Alkylglykosid-Lösungen
(2008-08-06)Alkylglycosides are molecules consisting of a hydrophobic alkyl chain and a hydrophilic head group, a glycoside. Due to this ambivalent structure of the molecules, above a specific concentration ... -
Ultraschallspektrometrie zum dynamischen Verhalten von Domänen in peptidhaltigen Lipidmembranen
(2005-08-05)In this thesis the influence of peptides on lipid membranes in vicinity of the main phase transition is investigated using ultrasonic spectrometry. For these experiments unilamellar vesicles ... -
Ultraschallunterstützte Kupferabscheidung
(2017-08-03)The electroless and electrolytic copper deposition are essential process steps in the production of printed circuit boards. Various studies have already shown that ultrasound can improve these processes. However, ultrasound ... -
Ultraschnelle, lichtinduzierte Primärprozesse im elektronisch angeregten Zustand des Grün Fluoreszierenden Proteins (GFP)
(2003-02-11)The photophysical processes of Green Fluorescent Protein (GFP) were studied by femtosecond time- and frequency-resolved as well as time-correlated single photon counting (TCSPC) experiments. ... -
Ultrasonic tomography for the characterization of the weathering state of marble
(2021-05-25)The present thesis investigated the application of ultrasonic tomography to evaluate the weathering condition of different marble varieties. Ultrasound analysis is a non-destructive examination method which is often used ... -
UML Profile for Communicating Systems
(2007-04-24)This thesis presents a new Unified Modeling Language 2 (UML) profile for communicating systems. It is developed for the unambiguous, executable specification and description of communication ... -
UML-based Test Specification for Communication Systems
(2004-10-28)Nowadays, the complexity of modern telecommunication systems has increased significantly and the requirement for thorough and systematic testing is undisputed. The TTCN-3 is an universal ... -
Umwelt-Genomik als Quelle für die Isolierung von neuen Operons und Genclustern aus mikrobiellen Konsortien
(2002-10-15)The main goal of the present work was the isolation of biotin biosynthesis genes and operons from microbial consortia employing a combined enrichment and direct cloning strategy. Cosmid ... -
Unbiased evaluation and development of Green's-function-based density-matrix functionals
(2016-10-25)Ab-initio calculations are dominated by density functional theory (DFT), which provides an efficient and accurate description of the electronic structure for most materials. For materials with strong correlations, however, ... -
Unconventional Carbene-Donor Ligands for the Development of new Catalysts
(2016-11-01)The development of a new synthesis strategy towards unconventional carbene ligands is shown in this work. Our major aim was to establish a synthetic strategy that would enable the efficient palladium or nickel catalysed ...