Sökning: "Rotational diffusion"

Visar resultat 1 - 5 av 38 avhandlingar innehållade orden Rotational diffusion.

  1. 1. Developing novel diffusion MRI methods for comprehensive analysis of restricted and anisotropic self-diffusion system

    Författare :Hong Jiang; Fysikalisk kemi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; MRI; diffusion; tissue microstructure; heterogeneity; diffusion encoding; q-vector; ;

    Sammanfattning : Diffusion MRI is a non-invasive imaging technique used to study the microstructural properties of biological tissues by observing the self-diffusion of water molecules. Traditional diffusion MRI methods, based on the pulsed gradient spin-echo sequence, employ magnetic field gradients to encode information about translational motion. LÄS MER

  3. 2. Dynamics and Thermodynamics of Translational and Rotational Diffusion Processes Driven out of Equilibrium

    Författare :Raffaele Marino; Erik Aurell; Lacoste David; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Translational and Rotational Diffusion Processes; Brownian; Fysik; Physics;

    Sammanfattning : Diffusion processes play an important role in describing systems in many fields of science, as in physics, biology, finance and social science. One of the most famous examples of the diffusion process is the Brownian motion. LÄS MER

  4. 3. Position Estimation and Tracking in Colloidal Particle Microscopy

    Författare :Mats Kvarnström; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; censored regression; colloidal chemistry; depth estimation; diffusion coefficient; nonparametric function estimation; position estimation; rotational symmetry; tracking; template matching; video microscopy; rotational symmetry;

    Sammanfattning : This thesis presents methods for estimating the locations (including depth) of spherical colloidal particles in images recorded in video microscopy. Understanding the behavior of colloidal interactions and diffusion is of crucial importance in a vast number of areas. LÄS MER

  5. 4. Two-Photon Excited Fluorescence Depolarisation : Experimental and Theoretical Development

    Författare :Linus Ryderfors; Emad Mukhtar; Lennart B.-Å. Johansson; Yehudi K. Levine; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Two-photon excitation; Fluorescence; Fluorescence depolarisation; Fluorescence anisotropy; Time-correlated single photon counting; Gold nanoparticles; Rotational diffusion; Excited state symmetry; Extended Förster theory; Orientation correlation functions; Donor-donor energy migration DDEM ; Chemical physics; Kemisk fysik;

    Sammanfattning : We have studied fundamental aspects of time-resolved two-photon excited fluorescence depolarisation. The thesis presents experimental as well as theoretical progress. LÄS MER

  7. 5. On the Use of Rotational CARS on Polyatomics and in Time Domain

    Författare :Ali Hosseinnia; Förbränningsfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Rotational CARS; Laser Diagnostics; Ethylene; Ethane; Internal Rotation; Coherent Lifetime; ultrafast spectroscopy; Fysicumarkivet A:2020:Hosseinnia;

    Sammanfattning : This thesis work concerns the further developments of dual-broadband rotational coherent anti-Stokes Raman spectroscopy (RCARS) through experimental and theoretical investigations. Rotational CARS is an established technique for gas-phase thermometry and concentration measurement with major applications in combustion diagnostics. LÄS MER