Sökning: "rare earth elements"

Visar resultat 1 - 5 av 56 uppsatser innehållade orden rare earth elements.

  1. 1. Measuring copper abundances in the Galactic Bulge

    Kandidat-uppsats, Lunds universitet/Astrofysik; Lunds universitet/Fysiska institutionen

    Författare :Nikolei Höglinger; [2024]
    Nyckelord :Copper; Galaxy: abundances; Galaxy: bulge; Chemical Evolution; Physics and Astronomy;

    Sammanfattning : Context: The chemical evolution of Cu in the Galactic bulge have been studied in a few studies using red giant branch stars, but the ages of individual red giant stars are difficult to determine. In addition, the bulge has been a challenging region of the Milky Way galaxy to obtain high-resolution spectra of stars, except when observing through certain few small fields into the bulge that are known to have low extinction. LÄS MER

  3. 2. PGE Geochemistry and Mineralogy of Dunite, Chromitite, and Laterite Samples from the Acoje Ophiolite Block, Philippines

    Master-uppsats, Luleå tekniska universitet/Geovetenskap och miljöteknik

    Författare :Michelle Dossey; [2023]
    Nyckelord :PGM; PGE; laterite; limonite; chromitite; dunite; platinum group minerals; platinum group elements; Acoje; Philippines;

    Sammanfattning : Ni-laterites have the potential to become unconventional ore deposits for platinum group elements (PGE). This study was conducted to determine enrichment trends of PGE as a result of the Ni-laterization process. LÄS MER

  4. 3. A Simulation-Based Decision Support Tool for Circularity : Remanufacturing of an Electric Machine Case Study

    Master-uppsats, KTH/Produktionsutveckling

    Författare :Mayari Pérez Tay; [2023]
    Nyckelord :Simulation; remanufacturing; circular business; electric machine;

    Sammanfattning : Over the last years, environmental concerns have grown regarding the pressure manufacturing activities exerts on natural resources. Many materials have been classified by the EU as scarce, rare earth elements found in magnets are amongst critical materials with high supply risk. LÄS MER

  5. 4. The Promise of a Green Revolution : Conceptions of climate change and sustainability in local movements objecting to mining establishment

    Master-uppsats, Uppsala universitet/Institutionen för kulturantropologi och etnologi

    Författare :Caroline Reinhammar; [2023]
    Nyckelord :;

    Sammanfattning : This study explores how vernacular understandings of climate change and sustainability are formed in relation to local disputes concerning mineral exploration. In a search for a solution to climate change, the interest in rare earth elements (REEs), and other metals used in green technology has resulted in granting mining companies processing concessions in Sweden. LÄS MER

  7. 5. A numerical comparison of the thermoacoustics for different equivalence ratios for n-dodecane using LES

    Master-uppsats, Lunds universitet/Institutionen för energivetenskaper

    Författare :Björn Jarfors; [2023]
    Nyckelord :Computational Fluid Dynamics; Bluff-body stabilised flames; Large Eddy Simulation; Thermoacoustics; Acoustics; NEUMANN Project; Jet engines; Aero engines; Airplanes; Combustion; Numerics; Technology and Engineering;

    Sammanfattning : Klimatförändringarna påverkar vår värld och det behövs ett mer hållbart samhälle. Flygindustrin är i behov av förändring, men flygmotorer är mycket komplexa och tar tid att utveckla. Termoakustiska instabiliteter har kraften att förstöra en motor, men också att minska miljöpåverkan. LÄS MER