Browsing Naturwissenschaften, Mathematik und Informatik by Title
Now showing items 3961-3980 of 5594
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Radio-frequency controlled low-energy electron pulses
(2024-08-23)Electron beams are invaluable for probing material structures and dynamic processes due to their large scattering cross sections and the versatility of tunable electron optics for diffraction and microscopy. Pulsed electron ... -
RAFT-Polymerisation an Oberflächen
(2007-07-24)Heterogeneous Reversible Addition-Fragmentation Chain Transfer (RAFT) polymerizations using solid-supported dithiobenzoates, trithiocarbonate, and xanthates, respectively, using nanometer-sized ... -
Rainfall partitioning and soil water dynamics along a tree species diversity gradient in a deciduous old-growth forest in Central Germany
(2010-09-06)Species diversity effects have been extensively investigated in grassland ecosystems, however, little is known about the influence of tree species diversity on the forest water cycle. ... -
Rainfall partitioning in differently used montane rainforests of Central Sulawesi, Indonesia
(2007-01-31)This study was conducted within the project 'Stability of Rainforest Margins in Indonesia' (STORMA) along the margins of the Lore Lindu National Park in Central Sulawesi, Indonesia. The ... -
Raman spectroscopy in Geobiology - Advances in detection and interpretation of organic signatures in rocks and minerals
(2014-01-21)In this thesis, Raman spectroscopy was applied to a broad range of rock types in order to test the ability of detecting and interpreting organic signals. In the field of geobiology Raman spectroscopy is relatively new, and ... -
Raman-Spektroskopie kleiner Moleküle und Molekülaggregate im Überschallstrahl nach thermischer Anregung
(2015-07-06)Small molecules and clusters have been characterized by spontaneous Raman scattering in a supersonic expansion. It is shown how vibrational and rotational temperatures in the jet can be determined using the Stokes/anti-Stokes ... -
Ramanspektroskopische Untersuchung der Esterfaltung in Überschallexpansionen, Oder: Wie man bei der Suche nach der Haarnadel im Esterhaufen fünf auf einmal findet
(2022-06-29)The conformational preference of linear alkyl chains with an ester group in the center was investigated using Raman spectroscopy in supersonic expansions. Like alkanes, short esters prefer a stretched conformation, but ... -
Ramanujan Regular Hypergraphs based on special Affine Bruhat-Tits Buildings
(2004-02-11)This dissertation is mainely about Ramanujan graphs and Hypergraphs, which are constracted with arithmetical tools. The unitgroups of Quaternions and division algebras play an important ... -
Ramularia collo-cygni an Gerste
(2011-07-04)A differentiation tool for symptomatically similar barley diseases developed in the course of researching this doctoral dissertation has wide practical applicability. However, R. collo-cygni ... -
Random Block Copolymer Melts in the Bulk and at Selective Substrates
(2011-12-15)Random block copolymers are polymers that consist of two different, randomly as- sembled types of blocks. Each of these blocks comprises one type of monomer and a repulsion between these ... -
Random Focusing of Tsunami Waves
(2015-11-09)Branched flow is a universal phenomenon of random focusing that occurs in wave or particle flows that propagate in weakly scattering, correlated random media. The consecutive effect of small random forces leads to regions ... -
Random Function Iterations for Stochastic Feasibility Problems
(2019-03-21)The aim of this thesis is to develop a theory that describes errors in fixed point iterations stochastically, treating the iterations as a Markov chain and analyzing them for convergence in distribution. These particular ... -
Random Iterations of Subhyperbolic Relaxed Newton's Methods
(2005-04-01)The family of the natural iterations of a subhyperbolic relaxed Newton s method of a complex polynomial devides the Riemann sphere into two disjoint sets: the nonempty, perfect, nowhere ... -
Randomized Approximation and Online Algorithms for Assignment Problems
(2015-06-10)In this thesis, we consider several combinatorial optimization problems which feature assignment decisions. The first part deals with variants of the generalized assignment problem. We study an extension with additional ... -
Rapid Determination of High-Resolution Protein Structures by Solution and Solid-state NMR Spectroscopy
(2008-04-08)NMR spectroscopy provides high-resolution structural information of biomolecules in near-physiological conditions. Structural studies of proteins and nucleic acids are critical for understanding biological processes at ... -
Rapid Determination of Protein Structures in Solution Using NMR Dipolar Couplings
(2005-04-06)Once NMR spectra are measured, two main steps follow to determine NMR structure. One is backbone resonance assignment and the other is structure calculation. The both are time consuming ... -
Raster-Thermospannungs-Mikroskopie der Interferenz von Elektronenwellen auf der Au(111)-Oberfläche
(2002-02-18)The interference pattern of scattered electron waves is studied for the 2D-electron gas of the Au(111)-surface. For this purpose, the local thermovoltage across the tunneling junction of ... -
Ratiometric fluorescence imaging and marker-free motion tracking of Langendorff perfused beating rabbit hearts
(2021-01-06)Optical mapping is a fluorescence based imaging technique used extensively in cardiac research to study the electrophysiological properties of isolated hearts kept at physiological conditions. The major limitation of ... -
Rational points and lines on cubic hypersurfaces
(2023-10-02)We study the solubility of cubic diophantine equations. In the first chapter, we discuss the convergence of the singular series of a cubic form, which is a central object in the study of the solutions of the associated ... -
Rauhigkeit und Durchmischung der Grenzflächen in laserdeponierten Cu-Ag- und Fe-Ag-Schichtsystemen
(2002-11-21)Due to the high kinetic energy of the ions that are produced during pulsed laser deposition, thin films prepared by this method show a number of marked differences when compared to films ...