Sökning: "Echo control"

Visar resultat 21 - 25 av 27 avhandlingar innehållade orden Echo control.

  1. 21. Hydrogen in oxides: a density-functional study of thermodynamic and kinetic aspects

    Författare :Mårten Björketun; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; proton conduction; La$_2$Zr$_2$O$_7$; protonation; kinetic Monte Carlo; density functional theory.; BaZrO$_3$; hydrogen oxide systems; electronic structure;

    Sammanfattning : Many solid oxides, especially those possessing a perovskite structure, exhibit significant proton conductivity when being acceptor doped and placed in hydrogen-containing atmospheres. Consequently, they have attracted attention foruse as solid membranes in electrochemical devices such as gas sensors, steam electrolyzers and fuel cells. LÄS MER

  3. 22. Assessment of skeletal structure by MR relaxometry

    Författare :Torkel B Brismar; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :magnetic resonance imaging; bone and bones; osteoporosis;

    Sammanfattning : Introduction: More than 40 per cent of all women older than 50 years will suffer from a hip, wrist or vertebral fracture. Most of these fractures are related to bone fragility, osteoporosis. If the disease is diagnosed and treated at an early stage the risk of fracture can be decreased. LÄS MER

  4. 23. Wet Low-Intensity Magnetic Separation: Measurement methods and Modelling

    Författare :Jan Stener; Holger Lieberwirth; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mineralteknik; Mineral Processing;

    Sammanfattning : In the mining industry, ferromagnetic particles (e.g. magnetite) are concentrated using wet low-intensity magnetic separation (LIMS). Mineral particles in suspension with water are pumped into the separator tank, and a magnetic concentrate is extracted by use of magnetic forces. LÄS MER

  5. 24. Individual and Family Consequences of Involuntary Job Loss

    Författare :Marcus Eliason; Göteborgs universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; job displacment; job loss; displaced workers; plant closure; linked employer-employee data; divorce; mortality; unemployment; job specific capital; added worker effect; female labour supply; family income;

    Sammanfattning : This thesis studies the long-term consequences of involuntary job loss. It consists of four self-contained essays. Essay I: Does Job Loss Shorten Life? This paper examines whether there is a causal relationship from job displacement to mortality. LÄS MER

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

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

    Sammanfattning : 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. LÄS MER