Sökning: "Rare earth"

Visar resultat 1 - 5 av 154 uppsatser innehållade orden Rare earth.

  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. Lär vi oss av historien? En kvalitativ studie som undersöker två perspektiv av hållbar utveckling i relation till gruvbrytning i Kiruna

    Kandidat-uppsats, Göteborgs universitet/Institutionen för globala studier

    Författare :Hanna Thomsen; [2023-10-26]
    Nyckelord :sustainable development; agenda 2030; indigenous; sami; mining; postcolonial theory; justice; global studies; development studies;

    Sammanfattning : To meet the contemporary demands of sustainable development, enterprises aim to undergo a green transition in order to handle the threats of climate change. Through the lens of postcolonial theories questioning the knowledge apprised from western societies, a new light can be shed on alternative approaches to global conventions such as Agenda 2030. LÄS MER

  4. 3. 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

  5. 4. 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

  7. 5. Photoluminescence Mapping of Erbium Doped Lithium Niobate

    Master-uppsats, KTH/Tillämpad fysik

    Författare :Chuanshi Xie; [2023]
    Nyckelord :Automotive mapping; Erbium emitters; Ion implantation; Lithium niobate on insulator; photoluminescence microscopy; Automatisk kartläggning; Erbium fotonemitterare; Jonimplantation; Litiumniobat på isolator; fotoluminiscensmikroskopi.;

    Sammanfattning : Lithium niobate (LiNbO3) is a human-made crystalline which is widely used in modern photonics due to its useful properties. In recent years, there has been significant progress in the development of lithium niobate on insulator (LNOI) technology, realizing a fully functional photonic integrated circuits, thanks to its capabilities in both electro-optics and second-order optical nonlinearity. LÄS MER