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Wyszukujesz frazę "Meshkova, V." wg kryterium: Autor

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    Wyświetlanie 1-3 z 3
    Tytuł:
    Coleopterous predators of pine bark beetles in the last years of the outbreak recorded in Ukraine
    Autorzy:
    Meshkova, V.
    Vorobei, A.
    Omelich, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/28407572.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Badawczy Leśnictwa
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2022, 64, 3; 161-172
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Xylophagous beetles (Coleoptera) in the zones of Gomilshanski lisy National Nature Park with different management regime
    Autorzy:
    Meshkova, V.
    Skrylnik, Y.
    Bieliavtsev, M.
    Zinchenko, O.
    Borysenko, O.
    Markina, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2106654.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    window trap
    species composition
    management regime
    biodiversity
    Coleoptera
    xylophage
    Gomilshanski lisy National Nature Park
    Opis:
    The purpose of the research was to assess the species composition and biodiversity indices for xylophagous beetles collected by window traps in the parts of Gomilshanski lisy National Nature Park with different management regimes and anthropogenic load. Four window traps were placed in each of the five groups of sample plots: clear felling, selective felling, stationary recreation, regulated recreation and protected zone. The data were analysed using the statistical software package PAST, particularly, the Menhinick index (DMn) and dominance index (D) were evaluated and classical clustering (unweighted pair-group average [UPGMA]) was performed. A total of 42 species of xylophages (9903 individuals) were collected from Curculionidae (Scolytinae and Cossoninae), Cerambycidae, Histeridae, Bostrichidae, Buprestidae and Lymexilidae. The highest species richness was in the plots of clear and selective felling (25 and 22 species, respectively) and the lowest was in the protected zone (16 species), regulated recreation (19 species) and stationary recreation (22 species). The Menhinick index (DMn) was the lowest in the protected zone (0.27), increased in the zone of regulated recreation (0.43) and stationary recreation (0.45) and was maximal in the plots of selective and clear felling (0.69 and 0.77, respectively). The number of individuals was maximal in the protected zone and minimal at the plots of selective and clear felling. All sites were dominated by Xyleborinus saxesenii (Ratzeburg, 1837) (66–85% individuals) and Anisandrus dispar (Fabricius, 1792) (8.5–20.7% individuals). Minimal dominance (0.49) was found in the plot of clear felling. Cluster analysis showed similarity of the xylophage complex in the plots of clear and selective felling, as well as in the zone of stationary and regulated recreation, which differed from the protected zone.
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2022, 64, 2; 69-82
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantum Efficiency of the Luminescence of Ytterbium(III) ß-Diketonates
    Autorzy:
    Meshkova, S. B.
    Topilova, Z. M.
    Bolshoy, D. V.
    Beltyukova, S. V.
    Tsvirko, M. P.
    Venchikov, V. Ya.
    Powiązania:
    https://bibliotekanauki.pl/articles/2010953.pdf
    Data publikacji:
    1999-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Cr
    Opis:
    The processes of the energy deactivation of electronic excitation in Yb(III) ß-diketonates and their dependence on the nature of ß-diketone and the second ligand as well as the environment and its state (complexes in organic solvents and polymer matrix) were studied. Taking as an example the ytterbium thenoyltrifluoroacetonate, it was shown that the energy losses in the ligand and Yb(III) ion, which is due to the high-frequency vibrations of the central C-H group of the ß-diketone, can lead to the decreased quantum yield of the luminescence. The increase in the medium rigidity causes the decrease in losses in the ligand, but does not affect the deactivation of the Yb(III) ion excited level. In the mix-ligand complexes the second ligand (1,10-phenanthroline) improves the screening of the central ion providing almost full transfer of the energy, absorbed by ligand, to ytterbium ion.
    Źródło:
    Acta Physica Polonica A; 1999, 95, 6; 983-990
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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