Sökning: "Excitation transfer"

Visar resultat 21 - 25 av 128 avhandlingar innehållade orden Excitation transfer.

  1. 21. Towards Conduction Band Mediated Multi-electron Transfer: Spectroscopic Studies of Photosensitizer-semiconductor-acceptor Assemblies

    Författare :Elin Sundin; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Solar fuels; charge separation; dye-sensitized; semiconductor thin films; electron transfer;

    Sammanfattning : Converting solar energy into a storable form in chemical bonds, i.e., generating solar fuels, is a promising strategy for producing renewable fuels. This however comes with several challenges that need to be solved before generation of solar fuels can become a reality. LÄS MER

  3. 22. Energy Transfer Processes and Quenching Pathways in Lanthanide Complexes: The Role of Structural Changes

    Författare :Daniel Kocsi; K. Eszter Borbas; Raphaël Tripier; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; lanthanide; luminescence; sensitisation; quenching; electron transfer; organic chromophores; fluorination; Chemistry with specialization in Inorganic Chemistry; Kemi med inriktning mot oorganisk kemi; Chemistry with specialization in Organic Chemistry; Kemi med inriktning mot organisk kemi;

    Sammanfattning : Due to their unique magnetic and luminescent properties, trivalent lanthanides (Ln(III)) have been widely utilised in cellular imaging. Ln(III) luminescence is usually sensitized by a light-harvesting ‘antenna’, a chromophore that can transfer the excitation energy to the Ln(III). LÄS MER

  4. 23. Experimental Investigation of the Acoustic Properties of Perforate using Acoustic Three-Ports

    Författare :Shail A. Shah; Susann Boij; Hans Bodén; Wim De Roeck; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Duct Acoustics; Acoustical Three-port; Perforated plate; Transfer Impedance; Scattering Matrix; Grazing Flow; High-level Excitation; Non-linear effects; Flow-Acoustic Interaction; Rectangular T-Junction; Farkostteknik; Vehicle and Maritime Engineering;

    Sammanfattning : This thesis discusses the aero-acoustic characterisation of a perforate sample using a three-port technique. A rectangular T-junction with a flush mounted perforated sample at the intersection form the acoustical three-port. LÄS MER

  5. 24. Applications of the Complex Modulation Transfer Function on SEA-systems

    Författare :Karl-Ola Lundberg; Teknisk akustik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; vacuum technology; hydraulics; Mechanical engineering; modulated noise; in-situ; modulation transfer function; loss factor; SEA; vibration and acoustic engineering; Maskinteknik; hydraulik; vakuumteknik; vibrationer; akustik;

    Sammanfattning : The SEA coupling and dissipation loss factors are determined in-situ from Complex Modulation Transfer Functions, CMTF:s, based on measured impulse-responses. A quotient of CMTF:s is least-square curve-fitted to a SEA model and the SEA loss factors are determined from the results of the curve-fit. LÄS MER

  7. 25. Transient State Fluorescence Microscopy - method development and biological applications : Exploiting the dark states of fluorophores to measure oxygen concentrations, redox state, Förster resonance energy transfer and membrane viscosity

    Författare :Thiemo Spielmann; Jerker Widengren; Karsten König; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Transient States imaging TRAST ; Triplet State imaging; fluorescence microscopy; modulated excitation; triplet state; radical state; trans-cis isomerisation;

    Sammanfattning : Due to their long lifetime, triplet, redox and other transient states of fluorophores are highly sensitive to the micro-environment. Imaging their spatial distribution in biological samples can therefore help answer interesting questions about the metabolism, molecular interactions and dynamics in living cells. LÄS MER