Sökning: "Langevin equation"

Hittade 5 uppsatser innehållade orden Langevin equation.

  1. 1. Model-Based Output-Only Identication of Coupled Thermoacoustic Modes

    Master-uppsats, KTH/MWL Marcus Wallenberg Laboratoriet

    Författare :Michael Kristian Pau; [2017]
    Nyckelord :;

    Sammanfattning : A model-based output-only method for identifying from time-series data the parameters that determine the dynamics of a stochastically forced thermoacoustic oscillator has previously been implemented in the case of a single standing thermoacoustic mode. This thesis presents an extension of the method in question to two coupled standing modes at the same frequency. LÄS MER

  3. 2. Nanoparticle Removal and Brownian Diffusion by Virus Removal Filters: Theoretical and Experimental Study

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Nanoteknologi och funktionella material

    Författare :Olof Gustafsson; [2017]
    Nyckelord :virus removal filtration; Péclet number; nanocellulose; hydrodynamic constraint; convective capture; diffusion;

    Sammanfattning : This study aims to examine the throughput of nanoparticles through a Cladophora cellulose based virus removal filter. The effect of Brownian motion and flow velocity on the retention of 5 nm gold nanoparticles, 12.8 nm dextran nanoparticles and 28 nm ΦX174 bacteriophages was examined through MATLAB simulations and filtration experiments. LÄS MER

  4. 3. Modeling and implementation of dense gas effects in a Lagrangian dispersion model

    Master-uppsats, Umeå universitet/Institutionen för fysik

    Författare :Niklas Brännlund; [2015]
    Nyckelord :Dense gas; Lagrangian dispersion model; Langevin equation; Stochastic modeling; Accidental releases;

    Sammanfattning : The use of hazardous toxic substances is very common in the industrial sector. The substances are often stored in tanks in storage compartments or transported between industrial premises. In case of an accident involving these substances, severe harm can affect both population and the environment. LÄS MER

  5. 4. Dissipative Quantum Dynamics and Decoherence

    Magister-uppsats, Institutionen för fysik

    Författare :Viktor Löfgren; [2011]
    Nyckelord :decoherence; quantum mechanics; dissipation; caldeira-leggett;

    Sammanfattning : Abstract This thesis has two parts, in the first, the Caldeira-Leggett model is introduced; its derivation and general consequences are explored following a paper by Caldeira and Leggett[1]. An operator-formalism shortcut through some of the more mathematically cumbersome parts of the derivation of the model is also developed. LÄS MER

  7. 5. A Particle Dispersion Model backward in time for the Stably Stratied Boundary Layer

    Master-uppsats, Institutionen för fysik

    Författare :Erik Sandström; [2011]
    Nyckelord :;

    Sammanfattning : At present FOI has a forward model for simulations of particle dispersion in the stablystratied boundary layer, based on the Langevin model and the Fokker-Planck equation.This thesis project aims to complement that model for the case of predicting the origin of aspecied dispersion given the location of the particles at a given time after the start of thedispersion. LÄS MER