Sökning: "Solid state NMR"

Visar resultat 11 - 15 av 103 avhandlingar innehållade orden Solid state NMR.

  1. 11. Solid state NMR of multiple-spin systems

    Författare :Mattias Edén; Joseph Virlet; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physical Chemistry; fysikalisk kemi;

    Sammanfattning : Many nuclear magnetic resonance (NMR) experiments subject the nuclear spins to time-periodic modulations, for example, mechanical sample rotation and irradiation by periodic radio-frequency pulse sequences. An efficient simulation algorithm (COMPUTE) has been proposed for calculating NMR spectra from such systems. LÄS MER

  3. 12. Studies in nuclear solid state physics : investigation of impurity states in metals by means of PAC, +SR and NMR

    Författare :Kjell M. Pernestål; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP;

    Sammanfattning : .... LÄS MER

  4. 13. Drugs and polymers in dissolving solid dispersions : NMR imaging and spectroscopy

    Författare :Carina Dahlberg; István Furó; Anna Millqvist-Fureby; Michael Schuleit; Jadwiga Tritt-Goc; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Physical chemistry; Fysikalisk kemi; Surface and colloid chemistry; Yt- och kolloidkemi; PHARMACY; FARMACI;

    Sammanfattning : The number of poorly water-soluble drug substances in the pharmaceutical pipeline is increasing, and thereby also the need to design effective drug delivery systems providing high bioavailability. One favourable formulation approach is preparation of solid dispersions, where dispersing a poorly water-soluble drug in a water-soluble polymer matrix improves the dissolution behaviour and the bioavailability of the drug. LÄS MER

  5. 14. New solid-state NMR methods for exciting and separating anisotropic interactions of spin I=1 nuclei

    Författare :Rihards Aleksis; Andrew Pell; Robert Schurko; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; solid-state NMR; quadrupolar; paramagnetic shifts; spinning solids; materials; Physical Chemistry; fysikalisk kemi;

    Sammanfattning : Solid-state NMR has become an essential tool for structural characterisation of materials, in particular systems with poor crystallinity and structural disorder. In recent years, a surge of interest has been observed for the study of paramagnetic systems, in which the interaction between nuclei and unpaired electrons allows to probe the electronic structure and properties of materials more directly. LÄS MER

  7. 15. Estimating molecular conformations by solid-state NMR spectroscopy

    Författare :Xiaolong Feng; R Griffin; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physical chemistry; Fysikalisk kemi; Physical Chemistry; fysikalisk kemi;

    Sammanfattning : Our understanding of structure-function relationships in biological systems demands new and more sophisticated methods for examining molecular structure. This thesis presents an effort of methodology development for molecular structure determination by solid-state NMR spectroscopy and applications to biological systems. LÄS MER