Search for dissertations about: "Lanthanides"

Showing result 21 - 25 of 34 swedish dissertations containing the word Lanthanides.

  2. 21. 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

  4. 22. METHOD DEVELOPMENT FOR SIGNATURES IN NUCLEAR MATERIAL FOR NUCLEAR FORENSIC PURPOSES

    Author : Anna Vesterlund; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Uranium; Nuclear forensics; Lanthanide patterns; ICP-MS; gamma spectrometry; 241Am;

    Abstract : Nuclear forensics is a scientific discipline where signatures in nuclear and other radioactive material are investigated and evaluated in order to aid in criminal investigations concerning these materials. Examples of signatures that may be useful is the age and isotopic composition of the nuclear material and trace elements in the material. READ MORE

  5. 23. 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. 24. Physics of Strong Correlations in Electronic Structure and Model Calculations

    Author : Urban Lundin; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Physics; Strongly correlated electrons; Electronic structure calculations; Fysik; Physics; Fysik; fysik; Physics;

    Abstract : Using field theoretical methods models of strongly correlated electrons have been investigated. Application to electronic structure calculations has been made. READ MORE

  7. 25. Unifying first-principles and model approaches for strongly correlated materials : Interplay between long- and short-range correlations

    Author : Fredrik Nilsson; Matematisk fysik; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; first-principle methods; strongly correlated materials; GW approximation; cRPA; random-phase approximation; dynamical mean-field theory; GW DMFT; downfolding;

    Abstract : In materials with open 3$d$ and 4$f$ shells the valence electrons are relatively localized around the atoms which leads to large electron-electron correlations. These, so called strongly correlated materials, exhibit many intriguing properties such as high $T_c$ superconductivity, colossal magneto-resistance and heavy fermion behaviour. READ MORE