Sökning: "Rare earth elements"

Visar resultat 31 - 35 av 75 avhandlingar innehållade orden Rare earth elements.

1. 31. Structural Studies of Mn-X (X=Al, Bi): Permanent Magnetic Materials without Rare Earth Metals

   Författare :Hailiang Fang; Martin Häggblad Sahlberg; Peter Svedlindh; Samrand Shafeie; Linda Udby; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Synthesis; Magnetism; Diffraction.; Chemistry with specialization in Inorganic Chemistry; Kemi med inriktning mot oorganisk kemi;

   Sammanfattning : How to generate and use electricity in a more efficient way is a major challenge for humankind. In this context, permanent magnets play an important role within a very broad range of electric power applications. The strongest magnets used today are mainly based on alloys that contain rare-earth metals, which are neither economical nor sustainable. LÄS MER

3. 32. Fibre Optic Magnetic Field Sensors Utilizing Iron Garnet Materials

   Författare :Hans Sohlström; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; yig; iron garnets; rare earth garnets; magneto-opics; optical waveguide; fibre optical sensors; magnetic field measurement; current measurement;

   Sammanfattning : This thesis deals with the subject of fibre optic magnetic field sensors utilizing iron garnet materials. Such materials exhibit a large Faraday rotation which make them advantageous for application in compact mag­netic field sensors. LÄS MER

4. 33. Collective Structure of Neutron-Rich Rare-Earth Nuclei and Development of Instrumentation for Gamma-Ray Spectroscopy

   Författare :Pär-Anders Söderström; Johan Nyberg; Ayşe Ataç; John Simpson; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; nuclear structure; collective models; 150 < A < 189; AGATA; HPGe detectors; gamma-ray tracking; NEDA; pulse-shape discrimination; neutrons; neural network; Nuclear physics; Kärnfysik; Physics with specialization in Nuclear Physics; Fysik med inriktning mot kärnfysik;

   Sammanfattning : Neutron-rich rare-earth nuclei are among the most collective nuclei that can be found in nature. In particular, the doubly mid-shell nucleus 170Dy is expected to be the nucleus where the collective structure is maximized. LÄS MER

5. 34. Bridging the floods - The role of social learning for resilience building in urban water services

   Författare :Åse Johannessen; Avdelningen för Riskhantering och Samhällssäkerhet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; urban water services; climate change; adaptation; urban transformation; transition; flood risk management; water resources management; disaster risk reduction; resilience; resilient cities;

   Sammanfattning : The development of cities is increasingly threatened by a worldwide water crisis. Urban water services (including drinking water, sanitation and drainage) are facing complex and multiple pressures, which are becoming increasingly frequent and severe. LÄS MER

7. 35. Cohesive and Spectroscopic properties of the Lanthanides within the Hubbard I Approximation

   Författare :Inka Laura Marie Locht; Igor Di Marco; Olle Eriksson; Annalisa Fasolino; Mikhail I. Katsnelson; Tim Wehling; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Lantanides; rare earths; cohesive properties; volume; bulk modulus; magnetism; magnetic properties; photoemission spectroscopy; XPS; BIS; Hubbard I Approximation; DMFT; DFT; RSPt; Full Potential Linear Muffin-tin orbitals; 4f electrons; localization; bonding; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

   Sammanfattning : We describe the rare-earth elements using the Hubbard I approximation. We show that the theory reproduces the cohesive properties, like the volume and bulk modulus, and we find an excellent agreement between theory and experiment for the (inverse) photo emission spectra of the valence band. LÄS MER