Essays about: "Spectral theory"

Showing result 1 - 5 of 47 essays containing the words Spectral theory.

  1. 1. Diffusion MRI of Brain Tissue: Importance of Axonal Trajectory

    University essay from Lunds universitet/Fysiska institutionen; Lunds universitet/Kärnfysik

    Author : Jan Brabec; [2018]
    Keywords : dMRI; diffusion magnetic resonance; axonal trajectory; axonal geometry; undulations; modeling; axons; inverse problem; diffusion spectrum; time-dependent diffusion; Physics and Astronomy;

    Abstract : Obtaining microstructural information non-invasively on brain tissue remains a challenge. Diffusion magnetic resonance imaging (dMRI) is an imaging method that can provide such information. That includes geometrical considerations of nerve cells projections, axons, that are present in the white matter of the human brain. READ MORE

  2. 2. Use of Diffuser Fibres in the Treatment of Prostate Cancer by Interstitial Photodynamic Therapy

    University essay from Lunds universitet/Matematik LTH

    Author : Shaineze Afir; [2018]
    Keywords : photodynamic therapy; cancer treatment; matlab; diffuser fibres; biomedical; Mathematics and Statistics;

    Abstract : SpectraCure AB is a start-up company aiming at treating internal solid tumours such as prostate tumours with an innovative technology called ‘Interstitial Photodynamic Therapy’. This treatment requires the use of fibres to deliver the amount of light required to activate a drug injected to the patient which leads to the destruction of the tumours. READ MORE

  3. 3. Broadening of spectral lines in the Gaia-ESO survey

    University essay from Uppsala universitet/Teoretisk fysik

    Author : Kristoffer Bengtsson; [2018]
    Keywords : Astronomy; Hydrogen; Iron; Spectral line broadening; collisional broadening; pressure broadening; Gaia; Stellar atmosphere; spectrum; stars: abundances; Atomic data; Astronomi; tryckbreddning; kollisionsbreddning; breddning av spektrallinjer; spektrum; väte; järn; Gaia; stjärnatmosfär; atomdata;

    Abstract : Analyzing stellar spectra plays a big role in understanding the evolution of our galaxy. Having good data for spectral line properties is very important when analyzing these spectra. One part of the Gaia-ESO public spectroscopic survey (GES) is to gather data for spectral line properties from stellar spectra. READ MORE

  4. 4. Higgs inflation

    University essay from Uppsala universitet/Teoretisk fysik

    Author : Erik Schildt; [2018]
    Keywords : inflation; Higgs inflation; nonminimal coupling; conformal transformation; Higgs cosmology; cosmology; higgs inflaton; inflaton;

    Abstract : In this project a recent model of inflation in which the Standard Model Higgs field with a nonminimal coupling to gravity takes on the role of the inflaton field is investigated. The tensor to scalar ratio, spectral index and the running of the spectral index  is calculated for a tree level analysis and compared with the Planck experiment. READ MORE

  5. 5. Limiting Spectral Distribution and Capacity of MIMO Systems

    University essay from Linköpings universitet/Matematiska institutionenLinköpings universitet/Tekniska fakulteten

    Author : Simon Jönsson; [2017]
    Keywords : Random Matrices; Statistical Theory; MIMO systems; Wigner Matrices; Wishart Matrices; Spectral Distribution; Channel Capacity;

    Abstract : In this thesis we will brush through fundamental multivariate statistical theory and then present MIMO-systems briefly in order to later calculate the channel capacity of a MIMO system. After theory has been presented we will then look at different properties of the channel capacity and then investigate a supposed MIMO system dataset and use standardized methods to verify it’s model. READ MORE