@article{BrilliantovSchmidt2009,
  author    = {Brilliantov, Nikolai V. and Schmidt, J{\"u}rgen},
  title     = {Aggregation kinetics in a flow : the role of particle-wall collisions},
  issn      = {1951-6355},
  doi       = {10.1140/epjst/e2009-01006-X},
  year      = {2009},
  abstract  = {Agglomeration in a fluid flow, when collisions of aggregates with channel walls are important is analyzed. We assume the diffusion-limited mechanism for clusters growth and the Stokes' force exerted on the agglomerates from the flow. Collisions of the particles with the channel walls are modeled by a random Poisson process. We develop an analytical theory for the size distribution of the aggregates and check the theoretical predictions by Monte Carlo simulations. The numerical data agree well with the analytical results.},
  language  = {en}
}
@article{JonesArridgeCoatesetal.2009,
  author    = {Jones, Geraint H. and Arridge, Christopher S. and Coates, Andrew J. and Lewis, Gethyn R. and Kanani, Sheila and Wellbrock, Anne and Young, David T. and Crary, Frank J. and Tokar, Robert L. and Wilson, R. J. and Hill, Thomas W. and Johnson, Robert E. and Mitchell, Donald G. and Schmidt, J{\"u}rgen and Kempf, Sascha and Beckmann, Uwe and Russell, Christopher T. and Jia, Y. D. and Dougherty, Michele K. and Waite, J. Hunter and Magee, Brian A.},
  title     = {Fine jet structure of electrically charged grains in Enceladus' plume},
  issn      = {0094-8276},
  doi       = {10.1029/2009gl038284},
  year      = {2009},
  abstract  = {By traversing the plume erupting from high southern latitudes on Saturn's moon Enceladus, Cassini orbiter instruments can directly sample the material therein. Cassini Plasma Spectrometer, CAPS, data show that a major plume component comprises previously-undetected particles of nanometer scales and larger that bridge the mass gap between previously observed gaseous species and solid icy grains. This population is electrically charged both negative and positive, indicating that subsurface triboelectric charging, i.e., contact electrification of condensed plume material may occur through mutual collisions within vents. The electric field of Saturn's magnetosphere controls the jets' morphologies, separating particles according to mass and charge. Fine-scale structuring of these particles' spatial distribution correlates with discrete plume jets' sources, and reveals locations of other possible active regions. The observed plume population likely forms a major component of high velocity nanometer particle streams detected outside Saturn's magnetosphere.},
  language  = {en}
}
@article{PostbergKempfSchmidtetal.2009,
  author    = {Postberg, Frank and Kempf, Sascha and Schmidt, J{\"u}rgen and Brilliantov, Nikolai V. and Beinsen, Alexander and Abel, Bernd and Buck, Udo and Srama, Ralf},
  title     = {Sodium salts in E-ring ice grains from an ocean below the surface of Enceladus},
  issn      = {0028-0836},
  doi       = {10.1038/Nature08046},
  year      = {2009},
  abstract  = {Saturn's moon Enceladus emits plumes of water vapour and ice particles from fractures near its south pole(1-5), suggesting the possibility of a subsurface ocean(5-7). These plume particles are the dominant source of Saturn's E ring(7,8). A previous in situ analysis(9) of these particles concluded that the minor organic or siliceous components, identified in many ice grains, could be evidence for interaction between Enceladus' rocky core and liquid water(9,10). It was not clear, however, whether the liquid is still present today or whether it has frozen. Here we report the identification of a population of E-ring grains that are rich in sodium salts (similar to 0.5- 2\% by mass), which can arise only if the plumes originate from liquid water. The abundance of various salt components in these particles, as well as the inferred basic pH, exhibit a compelling similarity to the predicted composition of a subsurface Enceladus ocean in contact with its rock core(11). The plume vapour is expected to be free of atomic sodium. Thus, the absence of sodium from optical spectra(12) is in good agreement with our results. In the E ring the upper limit for spectroscopy(12) is insufficiently sensitive to detect the concentrations we found.},
  language  = {en}
}
@article{ShepelyanskyPikovskijSchmidtetal.2009,
  author    = {Shepelyansky, Dima L. and Pikovskij, Arkadij and Schmidt, J{\"u}rgen and Spahn, Frank},
  title     = {Synchronization mechanism of sharp edges in rings of Saturn},
  issn      = {0035-8711},
  doi       = {10.1111/j.1365-2966.2009.14719.x},
  year      = {2009},
  abstract  = {We propose a new mechanism which explains the existence of enormously sharp edges in the rings of Saturn. This mechanism is based on the synchronization phenomenon due to which the epicycle rotational phases of particles in the ring, under certain conditions, become synchronized with the phase of external satellite, e. g. with the phase of Mimas in the case of the outer B ring edge. This synchronization eliminates collisions between particles and suppresses the diffusion induced by collisions by orders of magnitude. The minimum of the diffusion is reached at the centre of the synchronization regime corresponding to the ratio 2:1 between the orbital frequency at the edge of B ring and the orbital frequency of Mimas. The synchronization theory gives the sharpness of the edge in a few tens of meters that is in agreement with available observations.},
  language  = {en}
}