Sökning: "SPECTRA"

Visar resultat 1 - 5 av 917 avhandlingar innehållade ordet SPECTRA.

  1. 1. Sparse Modeling of Grouped Line Spectra

    Detta är en avhandling från Centre for Mathematical Sciences, Lund University

    Författare :Ted Kronvall; Lunds universitet.; Lund University.; Lund University.; [2015]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; line spectra; parameter estimation; convex optimization; group-sparsity; block-sparsity; dictionary learning; ADMM; adaptive penalty; total variation; multi-pitch estimation; chroma; audio processing; TDOA; near-field localization; amplitude modulation;

    Sammanfattning : This licentiate thesis focuses on clustered parametric models for estimation of line spectra, when the spectral content of a signal source is assumed to exhibit some form of grouping. Different from previous parametric approaches, which generally require explicit knowledge of the model orders, this thesis exploits sparse modeling, where the orders are implicitly chosen. LÄS MER

  2. 2. Modélisation théorique de la spectroscopie d'actinides des solvatés

    Detta är en avhandling från Stockholm : Department och Physics, Stockholm University

    Författare :Cecile Danilo; Stockholms universitet.; [2009]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Actinides; spectra; solution; NATURAL SCIENCES Physics Atomic and molecular physics Chemical physics; NATURVETENSKAP Fysik Atom- och molekylfysik Kemisk fysik; Chemical Physics; kemisk fysik;

    Sammanfattning : The framework of this PhD is the interpretation of Nuclear Magnetic Relaxation Dispersion experiments performed on solvated U4+, NpO2+ and PuO22+, which all have an f2 configuration. Unexpectedly the two actinyl ions have a much higher relaxivity than U4+. LÄS MER

  3. 3. Excitation and Ground-State Properties of Natural and Modified Nucleic Acid Bases

    Detta är en avhandling från Chalmers University of Technology

    Författare :Anders Holmén; Chalmers tekniska högskola.; Chalmers University of Technology.; [1997]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Kemi; Chemistry; DNA bases; transition moment; linear dichroism; spectra; ab initio; DFT; tautomerism; structure; IR;

    Sammanfattning : The nucleic acid bases are the carriers of genetic information in DNA and RNA. They are also the main chromophores of nucleic acids and determine their optical properties and sensitivity to UV radiation. LÄS MER

  4. 4. Mean Wind and Turbulence Conditions in the Boundary Layer above Forests

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Johan Arnqvist; Uppsala universitet.; [2015]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Wind power; Forest; Turbulence; Waves; Spectra; Wind model; Atmospheric stability; Vindkraft; Skog; Turbulens; Vågor; Spektra; Modell; Atmosfärisk stabilitet;

    Sammanfattning : As wind turbines have grown, new installation areas become possible. Placing wind turbines in forested landscapes introduce uncertainties to the wind resource estimation. LÄS MER

  5. 5. Spectra of interacting electrons in metals

    Detta är en avhandling från Chalmers University of Technology

    Författare :Bengt I. Lundqvist; Chalmers tekniska högskola.; Chalmers University of Technology.; [1969]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : .... LÄS MER