Sökning: "Mn As"

Visar resultat 16 - 20 av 337 avhandlingar innehållade orden Mn As.

  1. 16. Preparation and Characterization of the Magnetic Semiconductor (GaMn)As

    Författare :Martin Adell; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : The diluted ferromagnetic semiconductor (GaMn)As has been grown by low temperature molecular beam epitaxy and the effects of post growth treatments on the electronic, magnetic and structural properties have been studied. In situ low temperature annealing of (GaMn)As layers has been performed. LÄS MER

  3. 17. Manganese ores as oxygen carriers for chemical-looping combustion

    Författare :Sebastian Sundqvist; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Chemical-looping with oxygen uncoupling; gaseous fuel; methane; syngas; Chemical-looping combustion; manganese ores; combined oxides; wood char and solid fuels;

    Sammanfattning : Chemical looping combustion (CLC) is a fluidized bed system that circulates metal oxide particles in order to transport oxygen from an air reactor to a fuel reactor. In the fuel reactor a fuel reduces the oxygen carrier while producing CO2 and H2O. The oxygen carrier is then transported back to the air reactor and reoxidized. LÄS MER

  4. 18. Coastal signals of environmental changes: foraminifera as benthic monitors

    Författare :Inda Brinkmann; Kvartärgeologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; benthic foraminifera; proxy calibration; trace element geochemistry; environmental DNA; deoxygenation; drought; coastal environments;

    Sammanfattning : Climate changes, tightly linked to anthropogenic activities, are significantly altering environments and ecosystems globally, such as by increasing marine and coastal deoxygenation or occurrences of extreme weather events. The significance of paleoenvironmental and -climate reconstructions, as well as monitoring of current conditions, for unravelling baseline natural variation, today’s changes and potential future impacts, has been recognised by the Intergovernmental Panel on Climate Change (IPCC) reports. LÄS MER

  5. 19. Fissure-hosted mineral formation and metallogenesis in the Långban Fe-Mn-(Ba-As-Pb-Sb...) deposit, Bergslagen, Sweden

    Författare :Erik Jonsson; Ulf Hålenius; Tom Andersen; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; mineralogi; geologi; isotopgeokemi; mineraldiversitet; malmbildning; Palaeoproterozoikum; Bergslagen; Sverige; Earth sciences; Geovetenskap;

    Sammanfattning : The Långban deposit in the Bergslagen ore province is one of the most mineral-rich and complex localities on Earth. Yet, despite more than 100 years of research, much about its origin and evolution has remained unknown. LÄS MER

  7. 20. Lithium titanate as anode material in lithium-ion batteries : -A surface study

    Författare :Tim Nordh; Kristina Edström; Daniel Brandell; Carl Tengstedt; Carla Puglia; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; titanate battery anode SEI; Kemi med inriktning mot materialkemi; Chemistry with specialization in Materials Chemistry;

    Sammanfattning : The ever increasing awareness of the environment and sustainability drives research to find new solutions in every part of society. In the transport sector, this has led to a goal of replacing the internal combustion engine (ICE) with an electrical engine that can be powered by renewable electricity. LÄS MER