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  • ESR  (1)
  • motion analysis  (1)
  • polyvinylpyrrolidone  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Robust Estimation of Rotation Angles from Image Sequences Using the Annealing M-Estimator (1998)
    Springer
    Journal of mathematical imaging and vision 8 (1998), S. 181-192 
    Details
    ISSN: 1573-7683
    Schlagwort(e): deterministic annealing ; global optimization ; M-estimator ; motion analysis ; robust statistics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract A robust method is presented for computing rotation angles of image sequences from a set of corresponding points containing outliers. Assuming known rotation axis, a least-squares (LS) solution are derived to compute the rotation angle from a clean data set of point correspondences. Since clean data is not guaranteed, we introduce a robust solution, based on the M-estimator, to deal with outliers. Then we present an enhanced robust algorithm, called the annealing M-estimator (AM-estimator), for reliable robust estimation. The AM-estimator has several attractive advantages over the traditional M-estimator: By definition, the AM-estimator involves neither scale estimator nor free parameters and hence avoids instabilities therein. Algorithmically, it uses a deterministic annealing technique to approximate the global solution regardless of the initialization. Experimental results are presented to compare the performance of the LS, M- and AM-estimators for the angle estimation. Experiments show that in the presence of outliers, the M-estimator outperforms the LS estimator and the AM-estimator outperforms the M-estimator.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1008281429730
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Studies on the interactions between anionic surfactants and polyvinylpyrrolidone: Surface tension measurement, 13C NMR and ESR (1998)
    Springer
    Colloid & polymer science 276 (1998), S. 1-10 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Key words Interaction ; anionic surfactant ; polyvinylpyrrolidone ; ESR ; NMR
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract  The interaction between anionic surfactants and polyvinylpyrrolidone (PVP) are investigated using 13C NMR, ESR spectroscopy and surface tension measurements at the air/water interface. The behavior of single-chained surfactant, sodium dodecyl sulphonate (AS), is compared with that of the double-chained surfactant, sodium bis(2-ethylhexyl) phosphate (NaDEHP). The results showed that a surfactant–polymer complex of “necklace and head structure” is formed in AS aqueous solutions in the presence of PVP due to the hydrophobic interaction between PVP and AS. The AS micelles nucleate on the polymer hydrophobic sites, and the mobility of the AS head groups is not affected. But, for NaDEHP surfactant, it was found that PVP is little effective in influencing the monomer–micelle equilibrium and no surfactant– polymer complex formed in the NaDEHP aqueous solution.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s003960050201
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