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Träfflista för sökning "WFRF:(Schmid J. P.) srt2:(2000-2004)"

Sökning: WFRF:(Schmid J. P.) > (2000-2004)

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  • Lundgren, Edvin, et al. (författare)
  • Geometry of the valence transition induced surface reconstruction of Sm(0001).
  • 2002
  • Ingår i: Physical Review Letters. - 1079-7114 .- 0031-9007. ; 88:13, s. 136102-136102
  • Tidskriftsartikel (refereegranskat)abstract
    • We present a structural determination of the surface reconstruction of the Sm(0001) surface using surface x-ray diffraction, scanning tunneling microscopy, and ab initio calculations. The reconstruction is associated with a large (22%) expansion of the atomic radius for the top monolayer surface Sm atoms. The mechanism driving the surface reconstruction in Sm is unique among all elements and is connected to the strong correlations of the 4f electrons in Sm and the intermediate valence observed in certain Sm compounds. The atoms constituting the top monolayer of Sm(0001) have vastly different chemical properties compared to the layer underneath and behave as if they were an adsorbate of a different chemical species.
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  • Bernasconi, G, et al. (författare)
  • Evolutionary ecology of the prezygotic stage
  • 2004
  • Ingår i: Science. - : American Association for the Advancement of Science (AAAS). - 1095-9203 .- 0036-8075. ; 303:5660, s. 971-975
  • Forskningsöversikt (refereegranskat)abstract
    • The life cycles of sexually reproducing animals and flowering plants begin with male and female gametes and their fusion to form a zygote. Selection at this earliest stage is crucial for offspring quality and raises similar evolutionary issues, yet zoology and botany use dissimilar approaches. There are striking parallels in the role of prezygotic competition for sexual selection on males, cryptic female choice, sexual conflict, and against selfish genetic elements and genetic incompatibility. In both groups, understanding the evolution of sex-specific and reproductive traits will require an appreciation of the effects of prezygotic competition on fitness.
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