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Sökning: WFRF:(Hirata Kentaro)

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1.
  • Yabuta, Hikaru, et al. (författare)
  • Macromolecular organic matter in samples of the asteroid (162173) Ryugu
  • 2023
  • Ingår i: Science. - : American Association for the Advancement of Science. - 0036-8075 .- 1095-9203. ; 379:6634
  • Tidskriftsartikel (refereegranskat)abstract
    • Samples of the carbonaceous asteroid (162173) Ryugu were collected and brought to Earth by the Hayabusa2 spacecraft. We investigated the macromolecular organic matter in Ryugu samples and found that it contains aromatic and aliphatic carbon, ketone, and carboxyl functional groups. The spectroscopic features of the organic matter are consistent with those in chemically primitive carbonaceous chondrite meteorites that experienced parent-body aqueous alteration (reactions with liquid water). The morphology of the organic carbon includes nanoglobules and diffuse carbon associated with phyllosilicate and carbonate minerals. Deuterium and/or nitrogen-15 enrichments indicate that the organic matter formed in a cold molecular cloud or the presolar nebula. The diversity of the organic matter indicates variable levels of aqueous alteration on Ryugus parent body.
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2.
  • Aikawa, Hiroaki, 1956, et al. (författare)
  • MARTIN BOUNDARY FOR UNION OF CONVEX SETS
  • 2002
  • Ingår i: 京都大学数理解析研究所, Potential Theory and Related Topics. ; 1293, s. 1-14
  • Tidskriftsartikel (refereegranskat)abstract
    • We study Martin boundary points of aproper subdomain in $\mathbb{R}^{n}$ , where $n$ $\geq 2$ , that can be represented as the union of open convex sets. Especially, we give acertain sufficient condition for aboundary point to have exactly one (minimal) Martin boundary point.
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3.
  • Aikawa, Hiroaki, 1956, et al. (författare)
  • Martin boundary points of a John domain and unions of convex sets
  • 2006
  • Ingår i: J. Math. Soc. Japan. - 0025-5645 .- 1881-1167. ; 58:1, s. 247-274
  • Tidskriftsartikel (refereegranskat)abstract
    • We show that a John domain has finitely many minimal Martin boundary points at each Euclidean boundary point. The number of minimal Martin boundary points is estimated in terms of the John constant. In particular, if the John constant is bigger than $\sqrt3/2$ , then there are at most two minimal Martin boundary points at each Euclidean boundary point. For a class of John domains represented as the union of convex sets we give a sufficient condition for the Martin boundary and the Euclidean boundary to coincide.
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  • Resultat 1-3 av 3

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