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  • Copernicus  (1)
  • Nature Publishing Group  (1)
  • 2005-2009  (1)
  • 1940-1944  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Production of Electron Pairs (1941)
    [s.l.] : Nature Publishing Group
    Nature 148 (1941), S. 86-86 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SOME time ago we described a method1 for calculating rigorously (neglecting screening) the cross-section for production of electron-positron pairs in the field of a nucleus by a beam of γ-rays. This method also gave the energy distribution of the electrons or positrons. Results ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/148086b0
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    Paper (German National Licenses)
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    Mid-Tertiary palaeoenvironments in Thailand: pollen evidences (2009)
    Copernicus
    Details
    Publication Date: 2009-02-27
    Description: Only few data from South-East Asia document paleoenvironments evolution during the Cenozoic. Here we analyse palynological records from four sites of Thailand. The unique site dated from the Oligocene shows a temperate signal, while younger Miocene records show a tropical signal with variations in the hydrology of the deposition basin, as well as a temperate extra-local signal that could be related to a mid-altitude flora. The mid-Miocene Chiang Muan basin has delivered several occurrences of an opened biotope (Poaceae) alternatively replaced by what could be Syzygium gallery-forests. Khorat (−9 to −6.5 Ma) pollen records deliver similar results, but linked to a strong local signal. Regional and local signals remain difficult to separate, notably because of badly known palynomorphs, but our high resolution record confirm oceanic data that suggest high variability in Miocene climate, as well as modelling studies inferring an early onset of the Asian monsoon.
    Print ISSN: 1814-9340
    Electronic ISSN: 1814-9359
    Topics: Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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