Essays about: "Rare earth"

Showing result 1 - 5 of 125 essays containing the words Rare earth.

  1. 1. Measuring copper abundances in the Galactic Bulge

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

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

    Abstract : 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. READ MORE

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

    University essay from Luleå tekniska universitet/Geovetenskap och miljöteknik

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

    Abstract : 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. READ MORE

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

    University essay from KTH/Produktionsutveckling

    Author : Mayari Pérez Tay; [2023]
    Keywords : Simulation; remanufacturing; circular business; electric machine;

    Abstract : 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. READ MORE

  5. 4. Photoluminescence Mapping of Erbium Doped Lithium Niobate

    University essay from KTH/Tillämpad fysik

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

    Abstract : 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. READ MORE

  6. 5. Unveiling Contradictions: The Green Energy Transition and Sámi Indigenous Rights in the Per Geijer Expansion, Kiruna, Sweden

    University essay from Malmö universitet/Institutionen för Urbana Studier (US)

    Author : Maria Svensson; Maria Schmidt; [2023]
    Keywords : green energy transition; Indigenous rights; extractive industries; mining; sustainable development; Sámi; social sustainability;

    Abstract : In recent decades, there has been a growing recognition of Indigenous rights over traditional territories and natural resources, alongside the intensification of extractive activities on Indigenous lands, often in violation of their rights.The paradox is driven by several factors, including escalating global commodity prices, energy security concerns, and the shift towards green energy. READ MORE