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@PHDTHESIS{Herrmann:44088,
      author       = {Herrmann, Karl-Heinz},
      title        = {{N}ichtinvasive {C}haracterisierung von
                      {T}ransporteigenschaften poröser {M}edien :
                      dreidimensionale {U}ntersuchungen mit {H}ilfe der
                      {K}ernspintomographie},
      volume       = {3915},
      issn         = {0944-2952},
      school       = {Univ. Bonn},
      type         = {Dr. (Univ.)},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zenralbibliothek, Verlag},
      reportid     = {PreJuSER-44088, Juel-3915},
      series       = {Berichte des Forschungszentrums Jülich},
      pages        = {VIII, 109 p.},
      year         = {2001},
      note         = {Record converted from VDB: 12.11.2012; Bonn, Univ., Diss.,
                      2001},
      abstract     = {In this thesis a method is presented which gives access to
                      the water flow and the transport of tracer substances an a
                      laboratory scale by using nuclear magnetic resonance
                      imaging. The nuclear magnetic resonance allows a
                      non-invasive and threedimensional observation of the flow
                      and transport properties of a porous media and can be
                      visualized as a time series. Two different NMR methods are
                      employed to columns filled wich model porous media under
                      water saturated conditions. The first method is monitoring
                      the movement of a tracer substance (Ni$^{2+}$) whereas the
                      second method uses a diffusion sensitive NMR sequence to
                      determine the local flow velocities of the water molecules
                      directly without the need of a tracer. Both methods are the
                      basis for further geostatistical analysis like the spatial
                      moments of the tracer concentration and the correlation
                      length of the local water flow velocities. From the spatial
                      concentration moments the macroscopic effective dis persion
                      coefficients are calculated and compared wich the dispersion
                      coefficient determined by conventional methods (break
                      through curves and one-dimensional CDE modeling). These
                      macroscopic dispersion coefficients represent the
                      heterogeneity of the complete columns and include
                      inhomogeneities like packing flaws. In contrast to the
                      tracer monitoring the diffusion sensitive NMR sequence
                      determines the localized dispersive effect of the porous
                      media an a sub-mm scale. To gain the macroscopic effective
                      dispersion an the column scale the three dimensional
                      particle tracking programs TRACE and PARTRACE are employed,
                      based an the experimentally determined local flow
                      velocities.},
      cin          = {ICG-IV},
      cid          = {I:(DE-Juel1)VDB50},
      pnm          = {Pflanzenschutzmittel und andere organische Stoffe im System
                      Boden/Wasser/Pflanzen/Luft},
      pid          = {G:(DE-Juel1)FUEK79},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/44088},
}