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  • 1
    Digitale Medien
    Digitale Medien
    Baryon resonances as bound (q)3-states coupled to meson fields (1987)
    Springer
    The European physical journal 326 (1987), S. 413-420 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 12.40.Qq ; 13.30.Eg ; 14.20.−c
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Within the framework of the non-relativistic quark model (NRQM) we discuss the influence of the coupling between baryonic excitations and meson fields. This leads to the interpretation of the baryon resonances as bound (q)3-configurations embedded in the corresponding meson-baryon continua. This concept is formulated analytically and applied to the description of the low-lying (N=0)- and (N=1)-multiplets with strangeness (S=0) and (S=−1). It turns out that the effects of this coupling are comparable in size to the effects induced by the hyperfine interaction. In particular, a remarkable cancellation of the spin-orbit forces of theqq-interaction and the meson-baryon interaction is observed. The implications of the strong baryon-meson coupling on the baryon-baryon interaction and on the formulation of the Hamiltonian for a multibaryon system are briefly discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01289545
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  • 2
    Digitale Medien
    Digitale Medien
    A study of meson-baryon couplings in the constituent quark model (1990)
    Springer
    The European physical journal 337 (1990), S. 451-463 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 13.30.Eg ; 12.40.Aa ; 14.20.Gk
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Within the framework of the constituent quark model we discuss the effects of different types of meson-baryon-baryon vertex operators on the form factors and the coupling strengths of the lowest-lying positive and negative parity non-strange baryons. We compare the quark pair creation model (3P0-model) with the SU(6)-model in which mesons are treated as elementary fields that directly couple to the quarks. The latter model is employed both in the so-called static limit and in a modification motivated by Galilei invariance. It is demonstrated that the inclusion of non-static effects simulates some features of the3P0 vertex. Especially the reaction πN→ππN is found to be very sensitive to the different assumptions on the dynamics of theq¯q pair creation process. More indirect hints for the internal structure of the mesons might be obtained from the predicted asymmetry for the two form factors ofN→Δ+π andΔ→N+π, which occurs in the3P0-model, only.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01294983
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  • 3
    Digitale Medien
    Digitale Medien
    Viscosity of defined and undefined hydrocarbon liquids calculated using an extended corresponding-states model (1996)
    Springer
    International journal of thermophysics 17 (1996), S. 213-221 
    Details
    ISSN: 1572-9567
    Schlagwort(e): corresponding states ; petroleum fractions ; viscosity prediction
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We predict the viscosity of petroleum fractions using extended corresponding states. Our model builds upon the TRAPP procedure, which is the most advanced approach to predict transport properties of straight-chain nonpolar hydrocarbons and their mixtures. We perform comparisons with experimental viscosity data for pure hydrocarbons, treating them as nonstandard components; we find deviations of 10–15%. We also extend the model to predict the transport properties of petroleum fractions and compare with an experimental database of more than 80 crude oils, including highly aromatic petroleum fractions. The model predicts the viscosity of the crude oil fractions within experimental uncertainty.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01448223
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  • 4
    Digitale Medien
    Digitale Medien
    Transport Properties of Petroleum Fractions (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 85-95 
    Details
    ISSN: 1572-9567
    Schlagwort(e): corresponding states ; petroleum fractions ; propane ; viscosity, thermal conductivity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A corresponding-states model for the transport properties of petroleum fractions is presented. The model requires only the API specific gravity and the mean average boiling point as input parameters. The extended correspanding-states model uses propane as a reference fluid, and new generalized shape factor expressions that are functions of the acentric factor and the reduced temperature are presented. Also presented are new correlating functions for the viscosity and thermal conductivity of the reference fluid that can be extrapolated well below the freezing point of propane. The performance of the model is demonstrated by comparing with experimental data for viscosity and thermal conductivity of petroleum fractions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1021426113355
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