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Träfflista för sökning "(WFRF:(Diehl M)) srt2:(2005-2009) srt2:(2005)"

Sökning: (WFRF:(Diehl M)) srt2:(2005-2009) > (2005)

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1.
  • Collins, J, et al. (författare)
  • Unintegrated parton density functions
  • 2005
  • Ingår i: CERN Reports. - 0007-8328. ; CERN-2005-014, s. 256-273
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • An overview on activities to determine unintegrated parton density functions is given and the concept and need for unintegrated PDFs is discussed. It is also argued that it is important to reformulate perturbative QCD results in terms of fully unintegrated parton densities, differential in all components of the parton momentum. Also the need for non-linear BFKL evolution is discussed and results using the BK equation supplemented by DGLAP corrections at short distances is reviewed. Finally the use unintegrated generalized parton distributions for hard diffractive processes is discussed.
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2.
  • Anderson, K. E., et al. (författare)
  • Scaling population responses to spatial environmental variability in advection-dominated systems
  • 2005
  • Ingår i: Ecology Letters. ; 8:9, s. 933-943
  • Tidskriftsartikel (refereegranskat)abstract
    • We model the spatial dynamics of an open population of organisms that disperse solely through advection in order to understand responses to multiscale environmental variability. We show that the distance over which a population responds to a localized perturbation, called the response length, can be characterized as an organisms average lifetime dispersal distance, unless there is strong density-dependence in demographic or dispersal rates. Continuous spatial fluctuations in demographic rates at scales smaller than the response length will be largely averaged in the population distribution, whereas those in per capita emigration rates will be strongly tracked. We illustrate these results using a parameterized example to show how responses to environmental variability may differ in streams with different average current velocities. Our model suggests an approach to linking local dynamics dominated by dispersal processes to larger-scale dynamics dominated by births and deaths.
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