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Träfflista för sökning "WFRF:(Schumann G) srt2:(2008)"

Search: WFRF:(Schumann G) > (2008)

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  • Alwall, J., et al. (author)
  • Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions
  • 2008
  • In: European Physical Journal C. Particles and Fields. - : Springer Science and Business Media LLC. - 1434-6044. ; 53:3, s. 473-500
  • Journal article (peer-reviewed)abstract
    • We compare different procedures for combining fixed-order tree-level matrix-element generators with parton showers. We use the case of W-production at the Tevatron and the LHC to compare different implementations of the so-called CKKW and MLM schemes using different matrix-element generators and different parton cascades. We find that although similar results are obtained in all cases, there are important differences.
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  • Smedmark, Jenny E. E., et al. (author)
  • A Phylogeny of Urophylleae (Rubiaceae) based on rps16 intron data
  • 2008
  • In: Taxon. - 0040-0262. ; 57:1, s. 24-32
  • Journal article (peer-reviewed)abstract
    • This is the first study of phylogenetic relationships within the pantropical group Urophylleae. Previous studies have included few representatives from this group and little is known about its phylogeny. Here we use sequence data from the rps16 intron to address the question of where the four genera Temnopteryx, Pentaloncha, Pleiocarpidia, and Poecilocalyx, which have sometimes been classified in this group belong. By using different outgroups we show that there is conflict regarding the resolution among lineages in Rubioideae, which partly affects the support for relationships within Urophylleae. Urophylleae is shown to consist of two sister groups, one larger consisting only of Old World taxa and one smaller including the New World genera Amphidasya and Raritebe, and as sister of these two groups the African monotypic genus Temnopteryx. Pentaloncha, Pleiocarpidia, and Poecilocalyx all belong in the large Old World clade, which only comprises taxa included in the original circumscription of Urophylleae. Relationships within this group are not completely resolved, but Poecilocalyx is found to be the sister of Stelechantha and Pleiocarpidia to be the sister of Urophyllum leucophleum. Urophyllum is paraphyletic, as it seems to include Maschalocorymbus, Pleiocarpidia, Praravinia, and Pravinaria. It is not clear from the present analysis whether Pauridiantha is monophyletic or not.
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