Search for dissertations about: "Rare-earth"

Showing result 1 - 5 of 146 swedish dissertations containing the word Rare-earth.

  2. 1. Modeling and Optimization of Rare Earth Element Chromatography

    Author : Mark Max-Hansen; Avdelningen för kemiteknik; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Rare Earth Elements; Chromatography; Modeling; Optimization;

    Abstract : The Rare Earth Elements are a group of metals, that are of growing technical and economical importance. Current separation techniques can be detrimental to the environment, and a clean technology for separation has been devised, based on analytical chromatography of the REEs. READ MORE

  4. 2. Robust Multi-objective Optimization of Rare Earth Element Chromatography

    Author : Hans-Kristian Knutson; Avdelningen för kemiteknik; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Chromatography; Rare earth elements; Modeling; Multi-objective optimization; Robust optimization; Chromatography; Rare earth elements; Modeling; Multi-objective optimization; Robust optimization;

    Abstract : Rare earth elements comprise the metallic elements known as lanthanides as well as scandium and yttrium. They are extensively used in modern technological industries and are considered as strategic commodities in many countries. READ MORE

  5. 3. Recovery of Rare Earth Elements from an Apatite Concentrate

    Author : Mahmood Alemrajabi; Kerstin Forsberg; Åke C. Rasmuson; Koen Binnemans; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Rare earth elements; precipitation; nitrophosphate process; hollow fiber supported liquid membrane extraction; Chemical Engineering; Kemiteknik;

    Abstract : Rare earth elements (REE) are a group of 17 elements including lanthanides, yttrium and scandium; which are found in a variety of classes of minerals worldwide. The criticality of the application, lack of high grade and economically feasible REE resources and a monopolistic supply situation has raised significant attention in recovery of these metals from low grade ores and waste materials. READ MORE

  6. 4. Rare Earth Metal–Free Permanent Magnet Generators

    Author : Petter Eklund; Sandra Eriksson; Leijon Mats; Sonja Lundmark; Uppsala universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Engineering Science with specialization in Science of Electricity; Teknisk fysik med inriktning mot elektricitetslära;

    Abstract : Permanent magnet (PM) synchronous generators (SGs) are used in renewable energy production. The preferred PM material is neodymium-iron-boron (NdFeB), which has very high performance and, until recently, low cost. READ MORE

  7. 5. Coherent Processes in Rare-Earth-Ion-Doped Solids

    Author : Andreas Walther; Atomfysik; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; quantum memories; laser stabilization; quantum computation; rare-earth-ion-doped crystals; spectral hole-burning; superradiance; entanglement; spectroscopy; slow light;

    Abstract : This thesis describes a number of coherent processes, such as quantum information processing, superradiance and electromagnetically induced transparency, which have been experimentally implemented using rare-earth-ion-doped crystals. The rare-earths are a class of elements that have in common, an atomic structure that allows for very long lifetimes as well as coherence times, both on optical transitions and on spin transitions. READ MORE