Sökning: "väte spektrum"

Hittade 5 uppsatser innehållade orden väte spektrum.

  1. 1. An Infrared Stellar Thermometer: Exploiting IGRINS Spectra

    Kandidat-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

    Författare :Emelie Sandved; [2022]
    Nyckelord :Effective temperature; K-giants; surface gravity; oxygen abundance; carbon abundance; CO lines; OH lines; line sensitivities; Physics and Astronomy;

    Sammanfattning : Using the infrared (IR) spectral range when measuring stellar spectra is beneficial compared to using the optical range mainly when observing distant stars through the dust dense interstellar regions in the Galactic mid-plane. Methods to determine stellar parameters from IR spectra are, however, not fully developed yet because technological difficulties in creating reliable IR detectors have slowed the advance of such methods. LÄS MER

  3. 2. Tesla Valve for Hydrogen Decompression : Fluid Dynamic Analysis

    Kandidat-uppsats, KTH/Skolan för industriell teknik och management (ITM)

    Författare :Elias Bäckman; Mathilda Willén; [2019]
    Nyckelord :Decompression; Hydrogen gas; Tesla valve; no-moving parts; CFD; valve-to-valve; 压降；氢气；特斯拉阀；无可动阀芯；计算流体动力学；级间距; Decompression; Hydrogen gas; Tesla valve; No-moving parts; CFD; valve-to-valve;

    Sammanfattning : Människans påverkan på växthuseffekten har under de senaste åren varit en mycket aktuell fråga. Det är många olika faktorer som bidrar till ett negativt avtryck på miljön, där ett stort bidrag kommer från sektorn bilindustri. Majoriteten av dagens bilar drivs på fossila bränslen som genererar skadande utsläpp på miljön. LÄS MER

  4. 3. Copper abundances of F and G dwarf stars in the Milky Way

    Kandidat-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

    Författare :Filip Andersson; [2018]
    Nyckelord :Copper Abundance; Galaxy Formation; Dwarf Stars; Milky Way; Chemical Evolution; Physics and Astronomy;

    Sammanfattning : An investigation has been done in order increase the understanding of the origin and chemical evolution of copper in the Milky Way stellar disks. This is interesting to know as it plays a part of the Galaxy puzzle, so we become more able to map how and why galaxies look like they do. LÄS MER

  5. 4. Broadening of spectral lines in the Gaia-ESO survey

    Kandidat-uppsats, Uppsala universitet/Teoretisk fysik

    Författare :Kristoffer Bengtsson; [2018]
    Nyckelord :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;

    Sammanfattning : 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. LÄS MER

  7. 5. BNCT in vivo dosimetry A feasibility study using an HPGe detector for prompt gamma spectroscopy

    Master-uppsats, Lunds universitet/Sjukhusfysikerutbildningen

    Författare :Carl Östlund; [2005]
    Nyckelord :Strålterapi; Medicine and Health Sciences;

    Sammanfattning : Increased accuracy in patient dosimetry in BNCT is needed. This need for more accurate individual patient dose estimations initiated this project at the Swedish BNCT facility at Studsvik. One possible way to achieve this is to use an HPGe detector. LÄS MER