Sökning: "vortex"

Visar resultat 1 - 5 av 207 avhandlingar innehållade ordet vortex.

  1. 1. Vortex Properties from Resistive Transport Measurements on Extreme Type-II Superconductors

    Detta är en avhandling från Fysiska institutionen

    Författare :Andreas Rydh; KTH.; [2001]
    Nyckelord :superconductivity; vortex; phase transition; YBa2Cu3O7-d; vortex dynamics; critical current; single crystal; oxygen deficiency; anisotropy; vortex glass; vortex lattice; melting; vortex liquid; vortex correlation; disorder; Lorentz force;

    Sammanfattning : .... LÄS MER

  2. 2. Wind turbine wakes controland vortex shedding

    Detta är en avhandling från Fysiska institutionen

    Författare :Davide Medici; KTH.; [2004]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Wind Energy; Power Optimisation; Active Control; Yaw; Vortex; TECHNOLOGY Engineering mechanics Mechanical and thermal engineering Mechanical energy engineering; TEKNIKVETENSKAP Teknisk mekanik Mekanisk och termisk energiteknik Mekanisk energiteknik;

    Sammanfattning : Wind tunnel studies of the wake behind a model wind turbine have been made in order to get a better understanding of wake development as well as the possibility to predict the power output from downstream turbines working in the wake of an upstream one. Both two-component hot-wire anemometry as well as particle image velocimetry (PIV) have been used to map the flow field. LÄS MER

  3. 3. Vortex fluctuations in superconductors

    Detta är en avhandling från Umeå : Umeå universitet

    Författare :Peter Olsson; Umeå universitet.; [1992]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Superconductor; Two dimensions; vortex; coulomb gas; XY model; Kosterlitz-Thouless transition; high-Tc.;

    Sammanfattning : The vortex fluctuations have proved to be responsible for the onset of dissipation in thin type-II superconducting Aims. There is also growing evidence that dissipation in high- temperature superconductors exhibits the same kind of two-dimensional (2D) behavior. LÄS MER

  4. 4. Analytical vortex solutions to Navier-Stokes equation

    Detta är en avhandling från Växjö : Växjö University Press

    Författare :Henrik Tryggeson; Växjö universitet.; [2007]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; conical vortex; Navier-Stokes equation; analytical solution; 2-D vortices; turbulence; vortex ring; stretched vortex; coherent structures; TECHNOLOGY Engineering mechanics Fluid mechanics; TEKNIKVETENSKAP Teknisk mekanik Strömningsmekanik;

    Sammanfattning : Fluid dynamics considers the physics of liquids and gases. This is a branch of classical physics and is totally based on Newton's laws of motion. Nevertheless, the equation of fluid motion, Navier-Stokes equation, becomes very complicated to solve even for very simple configurations. LÄS MER

  5. 5. Resistive studies of vortices and fluctuations in single crystal YBa2Cu3O7-

    Detta är en avhandling från Stockholm : Fysik

    Författare :Therese Björnängen; KTH.; [2004]
    Nyckelord :condensed matter physics; high temperature superconductors; YB2Cu3O7-d; untwinned YBCO; oxygen deficiency; superconducting fluctuations; magnetoconductivity; in-plane anisotropy; vortex liquid; vortex solid; vortex correlation;

    Sammanfattning : High-temperature superconductors have been intensely studiedsince the discovery, almost 20 years ago. Their layeredstructure, extreme type-II behavior, large anisotropy, andstrong fluctuations have led to a large number of new andinteresting problems. LÄS MER