Browsing Naturwissenschaften, Mathematik und Informatik by Title
Now showing items 21-40 of 5496
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A colimit construction for groupoids
(2016-08-03)We consider Ore monoid actions in a certain bicategory of étale groupoids Gr_prop. Examples of such actions include self-similar groups, higher rank graphs and actions of Ore monoids on spaces by topological correspondences. ... -
A Comparison of Models and Methods for Spatial Interpolation in Statistics and Numerical Analysis
(2010-06-18)Interpolation of spatial data is a very general mathematical problem with many applications, such as surface reconstruction, the numerical solution of partial differential equations, learning ... -
A Content-Oriented Architecture for Publish/Subscribe Systems
(2015-04-01)With the user behavior of Internet shifting towards data dissemination and retrieval, Information Centric Networking (ICN) is proposed to suit these demands. ICN treats content as the first-class entity, with nodes exchanging ... -
A coronal loop in a box: From energy generation to coronal emission
(2023-03-17)The corona is the outer atmosphere of the Sun. It contains an abundance of bright arcs that consist of hot plasma trapped by the magnetic field. These coronal loops are heated to temperatures far surpassing the solar surface ... -
A cross-cultural study of motivational factors and values influencing purchase of organic food in Germany and Mexico.
(2010-09-15)The present dissertation compares the motives and values associated with the purchase of organic food in Germany and in Mexico. After an international literature review enough evidence ... -
A Dedicated Endstation for Waveguide-based X-Ray Imaging
(2012-08-30)X-ray microscopy has emerged as a powerful and versatile imaging technique in many fields of science over the last years, offering insights in opaque media at high spatial resolution. A major challenge remains the ... -
A Detailed Study of Axon Initial Segment Maturation and Structural Organization by Fluorescence Microscopy
(2016-02-03)The distribution and density of neuronal voltage-gated sodium channels (VGSCs) is important for neuronal excitability, maturation and plasticity. High density of VGSCs in the axon initial segment (AIS) depends on the ... -
A Dinuclear Dihydride Complex for Bimetallic Reductive Activation and Transformation of a Range of Inert Substrates
(2018-03-19)In this thesis, a dinickel(II) dihydride complex was used for small molecules activation, such as H2, O2, N2, S8, CO and so on. Here, we present the results of these works and analysis these results by various spectroscopies. -
A discrete geometric view on shear-deformable shell models
(2012-08-15)This thesis presents the construction of a geometrically nonlinear shear-deformable (Cosserat type) shell model by methods from discrete differential geometry (DDG). The model aims at applications in real-time simulations ... -
A feasibility study about the use of vector tomography for the reconstruction of the coronal magnetic field
(2006-03-20)The magnetic field contains the dominant energy per unit volume in the solar corona and therefore plays an important role in most coronal phenomena. But until now, no direct measurement of ... -
A Fine-Grain Scalable and Channel-Adaptive Hybrid Speech Coding Scheme for Voice over Wireless IP
(2006-12-13)Wireless LANs (WLANs) are being more and more widely deployed at present. They are a key element in dynamic business environments where permanent access to network resources is vital. They ... -
A Force Spectroscopy Setup to Mimic Cellular Interaction Processes
(2013-06-21)The main objective of this thesis was to establish a biophysical model system that permits to quantify forces involved in cell-cell contacts and cell-substrate-adhesion in a native-like fashion. For this purpose, colloidal ... -
A Fragment-Based Construction of a Neural Network Potential for Metal-Organic Frameworks
(2023-02-24)In recent years, many types of machine learning potentials (MLPs) have been developed, which are used to represent the high-dimensional potential-energy surface (PES) of a chemical system with similar accuracy as electronic ... -
A Framework for managing Quality of Service in Cloud Computing through Service Level Agreements
(2017-01-16)Until today, Cloud providers only offer a limited set of non-negotiable service levels to their customers. Most often these service levels are expressed as guarantees for availability together with the offer to have ... -
A Framework for Property-preserving Encryption in Wide Column Store Databases
(2017-08-15)While traditional database software usually relies on the relational SQL model, a lot of alternative approaches, commonly referred to as NoSQL (short for \Not only SQL") databases, occurred within the last years to meet ... -
A genetic system to study the nuclear pore complex permeability barrier of the yeast Saccharomyces cerevisiae
(2012-11-20)All nucleocytoplasmic transport occurs through nuclear pore complexes (NPCs). To hinder uncontrolled mixing of cytoplasmic and nuclear content, NPCs maintain the permeability barrier that suppresses passage of inert macromolecules ... -
A geobiological approach to carbonate factories and ecosystem changes across the Permian–Triassic boundary
(2022-04-05)Contemporary climate change is accelerating. Meanwhile, “Has the Earth’s sixth mass extinction already arrived?” is inquired. The Permian–Triassic crisis, as a possible analog in the Earth history, has aroused great ... -
A Grid-Adaptive Algebraic Hybrid RANS/LES Method
(2016-04-04)The present thesis considers the compressible Navier-Stokes equations to simulate the flow of air about basic and complex test cases. As numerical solution method the unstructured finite-volume solver DLR-TAU is used. The ... -
A healthy social life? Sociality and health indicators in wild red-fronted lemurs
(2022-06-29)In the last 40 years, an increasing number of studies from medicine, neurosciences, and psychology demonstrated links between many aspects of sociality, health, and fitness in humans and laboratory animals. Some studies ... -
A Hybrid Method for Inverse Obstacle Scattering Problems
(2007-05-30)We are interested in solving the time-harmonic inverse acoustic scattering problem. In this work, we present the state of the art of a new iterative method to numerically solve this problem. ...