Sökning: "Beryllium"

Visar resultat 1 - 5 av 27 avhandlingar innehållade ordet Beryllium.

  1. 1. Ion Beam Analysis of First Wall Materials Exposed to Plasma in Fusion Devices

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Per Petersson; Göran Possnert; Anders Hallén; Marek Rubel; Eduardo C. Alves; [2010]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ion beam analysis; Microbeam; Plasma wall interaction; Deuterium; Beryllium; Carbon fibre composites; Divertor; Nuclear reaction analysis; Helium-3; TECHNOLOGY Engineering physics Plasma physics with fusion; TEKNIKVETENSKAP Teknisk fysik Plasmafysik med fusion; Ion Physics; Jonfysik;

    Sammanfattning : One major step needed for fusion to become a reliable energy source is the development of materials for the extreme conditions (high temperature, radioactivity and erosion) caused by hot plasmas. The main goal of the present study is to use and optimise ion beam methods (lateral resolution and sensitivity) to characterise the distribution of hydrogen isotopes that act as fuel. LÄS MER

  2. 2. Influence of solar activity and environment on 10Be in recent natural archives

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Ann-Marie Berggren; Ala Aldahan; Göran Possnert; Anne Hormes; [2009]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; cosmogenic isotopes; beryllium; ice cores; varved lake sediments; accelerator mass spectrometry; co-precipitation; NATURAL SCIENCES Earth sciences Exogenous earth sciences Quaternary geology; NATURVETENSKAP Geovetenskap Exogen geovetenskap Kvartärgeologi;

    Sammanfattning : Understanding the link between the Sun and climate is vital in the current incidence of global climate change, and 10Be in natural archives constitutes an excellent tracer for this purpose. As cosmic rays enter the atmosphere, cosmogenic isotopes like 10Be and 14C are formed. LÄS MER

  3. 3. Experimental studies of materials migration in magnetic confinement fusion devices Novel methods for measurement of macro particle migration, transport of atomic impurities and characterization of exposed surfaces

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Igor Bykov; Henric Bergsåker; Matej Mayer; [2014]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; fusion; tokamak; RFP; divertor; limiter; SOL; transport; migration; surface analysis; IBA; ion micro beam; beryllium; tritium; Physics; Fysik;

    Sammanfattning : During several decades of research and development in the field of Magnetically Confined Fusion (MCF) the preferred selection of materials for Plasma Facing Components (PFC) has changed repeatedly. Without doubt, endurance of the first wall will decide research availability and lifespan of the first International Thermonuclear Research Reactor (ITER). LÄS MER

  4. 4. Incorporation and preservation of geochemical fingerprints in peat archives

    Detta är en avhandling från Umeå : Umeå Universitet

    Författare :Sophia V. Hansson; Richard Bindler; Dominik Weiss; [2013]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Peat; Beryllium; bulk density; C N-ratio; decomposition; deposition; downwash; elemental mobility; geochemistry; humification; lead; light transmission; mercury; peat accumulation; precipitation; Environmental Science; miljövetenskap;

    Sammanfattning : The present status of the environment, including environmental problems such as heavy metal accumulation in aquatic and terrestrial ecosystems, is in part the consequence of long-term changes. Cores from peatlands and other natural archives provide us with the potential to study aspects of the atmospheric cycling of elements, such as metal pollutants, on timescales much longer than the decade or two available to us with atmospheric deposition monitoring programs. LÄS MER

  5. 5. Om litium och beryllium i stjärnorna

    Detta är en avhandling från Stockholm : Stockholm University

    Författare :Lennart Hultqvist; [1977]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : .... LÄS MER