Sökning: "mass balance model"

Visar resultat 16 - 20 av 135 avhandlingar innehållade orden mass balance model.

  1. 16. Force Budget Analysis of Glacier Flow : Ice Dynamical Studies on Storglaciären, Sweden, and Ice Flow Investigations of Outlet Glaciers in Dronning Maud Land, Antarctica

    Författare :Jim Hedfors; Veijo Pohjola; Else Kolstrup; Niels Reeh; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physical geography and sedimentology; force budget; ice flux; ice dynamics; mass balance; strain heating; climate change; Storglaciären; Dronning Maud Land; Antarctica; Naturgeografi och sedimentologi; Physical geography; Naturgeografi;

    Sammanfattning : This thesis contributes to the understanding of glacier response to climate change by ice dynamical studies on Storglaciären, Sweden, and Bonnevie-Svendsenbreen, Kibergbreen and Plogbreen in Dronning Maud Land, Antarctica. Ice surface velocities, ice geometry and temperature information is fed through a force budget model to calculate ice mass outflux of these glacial systems via three-dimensional stress distributions for a flux-gate. LÄS MER

  3. 17. Nitrogen removal in treatment wetlands : Factors influencing spatial and temporal variations

    Författare :Sofia Kallner Bastviken; Karin Sundblad-Tonderski; Jos Verhoeven; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Wetlands; denitrification; macrophytes; nitrogen; nitrification; model; treatment wetlands; potential denitrification; Biology; Biologi;

    Sammanfattning : Decreasing the nitrogen transport from land to surrounding seas is a major task throughout the world to limit eutrophication of the coastal areas. Several approaches are currently used, including the establishment of wetlands, to decrease the transport of nitrogen. LÄS MER

  4. 18. A qualitative and quantitative study of nitrotyrosine using mass spectrometry and immunochemistry

    Författare :Ann-Sofi Söderling; Göteborgs universitet; []
    Nyckelord :mass spectrometry; oxidative stress; nitrotyrosine; nitric oxide; protein modification;

    Sammanfattning : Background: Reactive oxygen (ROS), and nitrogen (RNS) species are formed during normal metabolism and in higher concentration in pathological conditions. They may cause cellular damage when the antioxidant defence is unable to balance the production of oxidants. LÄS MER

  5. 19. Combining Models of Coronal Mass Ejections and Solar Dynamos

    Författare :Jörn Warnecke; Axel Brandenburg; Juri Toomre; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Magnetohydrodynamics; convection; turbulence; solar dynamo; solar rotation; solar activity; coronal mass ejections; Astronomy; astronomi;

    Sammanfattning : Observations show that Coronal Mass Ejections (CMEs) are associated with twisted magnetic flux configurations. Conventionally, CMEs are modeled by shearing and twisting the footpoints of a certain distribution of magnetic flux at the solar surface and letting it evolve at the surface. LÄS MER

  7. 20. From Peak to Peak: Exploring Electron Hopping and Mass Transport in Metal-Organic Frameworks

    Författare :Ashleigh T. Castner; Sascha Ott; Deanna M. D'Alessandro; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; charge transport; mass transport; metal-organic frameworks; electrocatalytic materials; electrochemistry; Kemi; Chemistry;

    Sammanfattning : Incorporating molecular electrocatalysts into solid support structures combines the best of two worlds: their molecular nature allows precise structural tunability for selective and efficient conversion of small molecule substrates, while their structural integrity is greatly improved by the heterogeneous support matrix to allow for long-term stability and potentially industrial-scale applications. Metal-organic frameworks (MOFs) represent a potential class of materials to act as viable support scaffolds for hosting molecular catalysts for sustainable energy conversion, exhibiting well-ordered porous structures that can support high loading densities of catalyst species. LÄS MER