23 research outputs found

    Dynamic nuclear polarization and spin-diffusion in non-conducting solids

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    There has been much renewed interest in dynamic nuclear polarization (DNP), particularly in the context of solid state biomolecular NMR and more recently dissolution DNP techniques for liquids. This paper reviews the role of spin diffusion in polarizing nuclear spins and discusses the role of the spin diffusion barrier, before going on to discuss some recent results.Comment: submitted to Applied Magnetic Resonance. The article should appear in a special issue that is being published in connection with the DNP Symposium help in Nottingham in August 200

    The Physics of the B Factories

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    ISOLLE: Locally linear embedding with geodesic distance

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    Varini C, Degenhard A, Nattkemper TW. ISOLLE: Locally linear embedding with geodesic distance. In: Jorge A, ed. KNOWLEDGE DISCOVERY IN DATABASES: PKDD 2005. Lecture notes in computer science ; 3721 : Lecture notes in artificial intelligence. Vol 3721. Berlin, Heidelberg: SPRINGER-VERLAG BERLIN; 2005: 331-342.Locally Linear Embedding (LLE) has recently been proposed as a method for dimensional reduction of high-dimensional nonlinear data sets. In LLE each data point is reconstructed from a linear combination of its n nearest neighbors, which are typically found using the Euclidean Distance. We propose an extension of LLE which consists in performing the search for the neighbors with respect to the geodesic distance (ISOLLE). In this study we show that the usage of this metric can lead to a more accurate preservation of the data structure. The proposed approach is validated on both real-world and synthetic data
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