Auflistung nach DDC-Klassifikation "ddc:530"
Anzeige der Dokumente 1-20 von 561
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3D Impedance Modelling of Metal Anodes in Solid-State Batteries − Incompatibility of Pore Formation and Constriction Effect in Physical-Based 1D Circuit Models
(2022-09-08)A non-ideal contact at the electrode/solid electrolyte interface of a solid-state battery arising due to pores (voids) or inclusions results in a constriction effect that severely deteriorates the electric transport ... -
A kinetic Fokker-Planck algorithm for simulating multiscale gas flows
(2022)Numerical, aerodynamic analysis of spacecraft requires the modeling of rarefied hypersonic flows. Such flow regimes are usually dominated by broad shock waves and strong expansion flows. In such areas of the flow the gas ... -
An ab initio approach to spin transport in magnetic tunnel junctions with disorder
(2015)In this work we investigate the spin(-dependent) transport in FeCo/MgO/FeCo magnetic tunnel junctions (MTJ) using advanced ab initio methods. Here, a special focus lies on the impact of the disordered alloy leads with ... -
Ab initio description of disorder effects in layered cathode active materials by the coherent potential approximation
(2022)Disorder effects in alloys are usually modeled by averaging various supercell calculations considering different positions of the alloy atoms. This approach, however, is only possible as long as the portion of the individual ... -
Ab initio description of lattice dynamics in oxide semiconductors
(2017)As non-toxic and sustainable materials the system of binary oxide semiconductors Cu2O, Cu4O3, and CuO is in the focus of current research, e.g., for solar-cell applications. The objective of this work is to analyse the ... -
Ab initio Description of Materials Properties: An Application to Thermoelectric and Raman Scattering Phenomena
(2019)The need of efficient and sustainable alternatives to raw materials for technological applications has driven an intense research effort in the field of materials science. The scientific strategies aim to replace or ... -
Ab initio description of transport in nanostructures including electron-phonon coupling
(2018)The ongoing trends toward miniaturization and exploitation of non-classical degrees of freedom severely challenge the available methods for the theoretical description of electronic devices, because in realistic situations ... -
Der Abschattungseffekt im nuklearen Photoabsorptionsquerschnitt
(2000)In dieser Arbeit wurde der Abschattungseffekt in nuklearen Reaktionen hochenergetischer Teilchen diskutiert, wobei der Schwerpunkt auf die Erklärung desNiederenergie-Einsatzes der Abschattung in nuklearer Photoabsorption ... -
Advanced group III-nitride nanowire heterostructures - self-assembly and position-controlled growth
(2017)Group III-nitride nanowires and nanowire heterostructures were grown by plasma-assisted molecular beam epitaxy. Structural characterization was carried out by electron microscopy and X-Ray diffraction analysis; the optical ... -
Advancement of the DLR TAU Code Method to Simulate Two-phase Flow with Phase-change at the Interface with Applications in Upper Stages of Space Launch Systems
(2023)The presented thesis discusses work that has been conducted to extend the German Aerospace Center (DLR) TAU Code to simulate heat and mass transfer in two-phase systems in launcher cryogenic upper stages. Preceding work ... -
Analysis of diamondoids on metallic surfaces with scanning probe Microscopy
(2017)In this work, we based the determination of self-assembled monolayers on Scanning Probe Microscopy (SPM). We focused on two different aspects of SPM. The frst aspect concerns the instrumentation applied in this research. ... -
Analysis of hard exclusive scattering processes of the HERMES recoil experiment
(2014)Deeply virtual Compton Scattering (DVCS), e p-> e p gamma is the simplest reaction giving indication of generalized parton distributions (GPD) of the nucleon. The DVCS process has the same final state as the Bethe-Heitler ... -
Analysis of Hypersonic Boundary Layer Turbulence by Means of Focused Laser Differential Interferometry
(2023)This thesis investigates a hypersonic turbulent boundary layer over a cone with cold walls and a sharp nose tip. The analyses include frequency spectra of density fluctuations up to a frequency of 10 MHz, as well as an ...