Sökning: "spectra determination"

Visar resultat 1 - 5 av 27 uppsatser innehållade orden spectra determination.

  1. 1. Spectroscopic determination of stellar parameters to constrain atomic diffusion in the old open cluster M67

    Kandidat-uppsats, Uppsala universitet/Institutionen för fysik och astronomi

    Författare :Fabian Lundell; [2022]
    Nyckelord :;

    Sammanfattning : In an attempt to check published results on diffusion effects in M67 a non-LTE analysis is made on 28 high resolution FLAMES-UVES spectra of dwarfs and sub-giants around the turnoff point, where core hydrogen fusion halts. This analysis utilizes the software-suites LOTUS and iSpec to determine stellar parameters from equivalent-width measurements. LÄS MER

  3. 2. DEVELOPMENT, VALIDATION AND APPLICATION OF A METHOD FOR DETERMINATION OF METABOLITE CONCENTRATIONS WITH PRECLINICAL MAGNETIC RESONANCE SPECTROSCOPY

    Master-uppsats,

    Författare :Lukas Lundholm; [2021-05-10]
    Nyckelord :Medical physics; Basis sets; Metabolites; Quantification; Animal study; MRS;

    Sammanfattning : Background: Information on the metabolic content in tissue has diagnostic and prognostic value when examining for example cancer and diseases of the brain. MR spectroscopy is a non-invasive method that allows quantification of metabolite concentrations in vivo, without the use of ionizing radiation, which makes the method highly attractive for both research and clinical applications. LÄS MER

  4. 3. An Infrared Stellar Thermometer

    Kandidat-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

    Författare :Ieva Puspure; [2021]
    Nyckelord :Infrared Spectroscopy; Infrared; Red giants; Stellar Temperature; Spectroscopy; Physics and Astronomy;

    Sammanfattning : Infrared (IR) spectroscopy has many advantages over optical, one of which is allowing us to see through intergalactic dust, letting us probe deeper into space and dust-dense regions such as galactic centers. However the investigating the IR spectral range is a relatively new field, owing to recent developments in detector technology, and stellar parameter determination in IR is not well researched. LÄS MER

  5. 4. Reactivity and photochemistry of copper halide complexes

    Uppsats för yrkesexamina på grundnivå, KTH/Skolan för kemi, bioteknologi och hälsa (CBH)

    Författare :Needa Athitaya Wicksell Chuainukun; [2021]
    Nyckelord :Photochemistry; Copper iodide complexes; Substituted pyridines; Thin films; Luminescence lifetime;

    Sammanfattning : This paper deals with 3-picoline, 4-picoline, 3,4-lutidine and 3,5-lutidine complexes of copper(I) iodide (CuI(3-pic), CuI(4-pic), CuI(3,4-lut) and (CuI(3,5-lut)). The experimental investigation was divided into several parts. Firstly, the synthesis and characterization of the compounds both as powder and as thin films. LÄS MER

  7. 5. Towards a high resolution view of infrared line formation

    Master-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

    Författare :Martin Schmidt Montelius; [2021]
    Nyckelord :Spectroscopy; Near infrared; K giants; Galactic archeaology; Galactic chemical evolution; Abundances; Milky Way; Physics and Astronomy;

    Sammanfattning : Observing in the infrared has many benefits, such as seeing through the interstellar dust in the galaxy, easier use of adaptive optics, and better flux ratios for direct observations of exoplanets. Before the infrared spectral range can be utilised for highly accurate stellar spectroscopy there is a need for a better understanding of both stellar modelling and the atomic physics that go into forming spectral lines. LÄS MER