Sökning: "proton transport"

Visar resultat 21 - 25 av 78 avhandlingar innehållade orden proton transport.

  1. 21. Mass transport in proton conducting membranes for the direct methanol fuel cell

    Detta är en avhandling från Stockholm : KTH

    Författare :Thomas Vernersson; KTH.; [2005]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Chemical engineering; Kemiteknik; TECHNOLOGY Chemical engineering; TEKNIKVETENSKAP Kemiteknik;

    Sammanfattning : .... LÄS MER

  2. 22. Characterization of a new amino acid transport system in human epidermal Langerhans cells

    Detta är en avhandling från Department of Dermatology and Venereology, Lund University

    Författare :Niels Bendsöe; [2003]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; amino acid transport; energy charge; epidermis; glycolysis; lactate; Langerhans cells; L-dopa; mitochondria; omeprazole; Dermatology; venereology; Dermatologi; venereologi;

    Sammanfattning : Based on the discovery of a new amino acid transport system in Langerhans cells (LC), various aspects concerning the L-dopa uptake mechanism into human epidermal LC and the energy metabolism of epidermis have been examined and subsequently characterised. The system lacks any characteristics of other described amino acid transport systems in other cell types. LÄS MER

  3. 23. Analysis of Fluorescence Flicker as a Tool to Monitor Proton Transport and Biomolecular Interactions

    Detta är en avhandling från Stockholm : KTH

    Författare :Tor Sandén; KTH.; [2006]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURAL SCIENCES Physics; NATURVETENSKAP Fysik;

    Sammanfattning : The overall focus of this thesis is on fluorescence flicker processes of fluorescent molecules, e.g. protonation-deprotonation or singlet-triplet electronic state transitions, intrinsic or generated by their interaction with their environment, monitored by fluorescence spectroscopy. LÄS MER

  4. 24. Beyond average crystal structures: understanding extended and local environments in proton-conducting Sc-substituted BaTiO3 perovskites

    Detta är en avhandling från Gothenburg : Chalmers tekniska högskola

    Författare :Nico Torino; [2019]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; proton conducting oxide; IR; thermogravimetry; perovskite; neutron scattering; Raman; Reverse Monte Carlo; ordering; BaTiO3;

    Sammanfattning : Proton conducting ceramics are very promising for applications concerned with energy sourcing with cleaner, safer, more abundant and cheaper alternatives to fossil fuels. These materials are still in development and advances in the field depend on a better understanding of the role of defects, their identification and location in the host framework, and the assessment of their short- and long-range dynamics and kinetics. LÄS MER

  5. 25. Electrode degradation in proton exchange membrane fuel cells

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

    Författare :Alejandro Oyarce; KTH.; [2013]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; PEMFC; PEFC; Porous electrodes; Carbon corrosion; Carbon nanotubes; Carbon fibers; Polyhedral carbon nanofoams; Phosphonated hydrocarbon ionomer; Mass-transport losses; Electrode morphology; Electrode collapse; Start-up and shut-down; System strategies; Stainless steel; Bi-polar plates; In-situ contact resistance.;

    Sammanfattning : The topic of this thesis is the degradation of fuel cell electrodes in proton exchange membrane fuel cells (PEMFCs). In particular, the degradation associated with localized fuel starvation, which is often encountered during start-ups and shut-downs (SUs/SDs) of PEMFCs. At SU/SD, O2 and H2 usually coexist in the anode compartment. LÄS MER