Sökning: "scalar fields"

Visar resultat 1 - 5 av 34 avhandlingar innehållade orden scalar fields.

  1. 1. Comparison and Tracking Methods for Interactive Visualization of Topological Structures in Scalar Fields

    Författare :Himangshu Saikia; Tino Weinkauf; Filip Sadlo; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; topology; scalar fields; merge tree; tree comparison; tracking; similarity search; Computer Science; Datalogi;

    Sammanfattning : Scalar fields occur quite commonly in several application areas in both static and time-dependent forms. Hence a proper visualization of scalar fieldsneeds to be equipped with tools to extract and focus on important features of the data. LÄS MER

  3. 2. Hot and Dense Gauge Theories with External Fields

    Författare :David Persson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : In the introductory part of this thesis, I briefly review quantum statistichal mechanics; quantum field theory with external fields; the real and imaginary time formalisms in thermal field theory; and the hard thermal loop resummation. In the second part, consisting of here reprinted research articles, we apply this to quantum electrodynamics and quantum chromodynamics with a background (chromo-) magnetic field in the presence of a heat and charge reservoir. LÄS MER

  4. 3. Anisotropy-resolving subgrid-scale modelling using explicit algebraic closures for large eddy simulation

    Författare :Amin Rasam; Arne Johansson; Bernard Geurts; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Turbulence; large eddy simulation; explicit algebraic subgridscale model; passive scalar; stochastic modelling; periodic hill flow; Engineering Mechanics; Teknisk mekanik;

    Sammanfattning : The present thesis deals with the development and performance analysis ofanisotropy-resolving models for the small, unresolved scales (”sub-grid scales”,SGS) in large eddy simulation (LES). The models are characterised by a descriptionof anisotropy by use of explicit algebraic models for both the subgridscale(SGS) stress tensor (EASSM) and SGS scalar flux vector (EASSFM). LÄS MER

  5. 4. Static Visualizations for Dynamic Hierarchies

    Författare :Wiebke Köpp; Tino Weinkauf; Vijay Natarajan; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Dynamic hierarchies; Static visualization; Pixel-based visualization; Scalar data; Topology; Layout stability; Dynamiska hierarkier; Statisk visualisering; Pixelbaserad visualisering; Skalärdata; Topologi; Layout-stabilitet; Datalogi; Computer Science;

    Sammanfattning : Dynamic hierarchical data describes phenomena in a wide range of domains, from file management to demographics and business administration, as well as feature extraction results in spatial scientific data. As with all data, visualization is an integral step for gaining understanding about dynamic hierarchical data. LÄS MER

  7. 5. Robust Sound Field Control for Audio Reproduction : A Polynomial Approach to Discrete-Time Acoustic Modeling and Filter Design

    Författare :Lars-Johan Brännmark; Anders Ahlén; Mikael Sternad; Mathias Johansson; Rodney Kennedy; Uppsala universitet; []
    Nyckelord :Acoustic signal processing; equalizers; error modeling; feedforward control; interpolation; loudspeakers; multivariable filters; polynomials; robustness; sound fields;

    Sammanfattning : This thesis is concerned with the design and analysis of robust discrete-time filters for audio equalization and sound field control in real reverberant environments. Inspired by methods in polynomial control theory, a unified framework for acoustic modeling and filter design is developed. LÄS MER