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Wyszukujesz frazę "Yampolskii, Yu." wg kryterium: Autor

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    Wyświetlanie 1-3 z 3
    Tytuł:
    Nanoporosity of Polymer Sorbents and Membrane Materials as Seen by PALS and Low Temperature Gas Sorption
    Autorzy:
    Shantarovich, V.
    Bekeshev, V.
    Kevdina, I.
    Yampolskii, Yu.
    Bermeshev, M.
    Belov, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033916.pdf
    Data publikacji:
    2017-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    61.43.Gt
    Opis:
    The limits of application of positron annihilation lifetime spectroscopy and low temperature gas sorption for studying nanoporosity of polymer sorbents and membrane materials are discussed relying on the results previously obtained by the authors. For the two methods, limitations are determined by different factors: the dispersion of the material is essential for low temperature gas sorption, while concentration of nanopores of given size is important for positron annihilation lifetime spectroscopy. The both methods came out to be a useful addition to each other in the studies of micropores and mesopores.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 5; 1548-1551
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Local Rigidity as a Criterion of Gas Permeation of Polymer and Composition Materials; PAL and TSL Experiments
    Autorzy:
    Shantarovich, V.
    Gustov, V.
    Belousova, E.
    Polyakova, A.
    Bekeshev, V.
    Kevdina, I.
    Yampolskii, Yu.
    Pastukhov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1196455.pdf
    Data publikacji:
    2014-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.41.+e
    61.43.Fs
    68.43.Vx
    78.70.Bj
    82.35.Lr
    Opis:
    Various commercial and industrial properties of polymeric materials can be developed by the way of purposeful synthesis. For example, there are polymeric materials of extremely developed intrinsic microporosity. In attempts to further develop membrane properties (permeability and selectivity), the researchers artificially increase the pore sizes by various external influences, such as plastification by saturation of polymers with gases, sometimes in supercritical state, filling of a polymer with some non-organic components (zeolites). Sometimes, porosity of the composition appears to become higher than that of the components. This porosity, in difference with intrinsic one, can be called externally affected. The reason of these phenomena is not always clear, and in order to get some ideas in this field we suggest an experimental study using a combination of the two genetically interconnected (by spur processes) methods: positron annihilation lifetime spectroscopy and thermostimulated luminescence. This paper summarizes recently published and completely new results of the authors in order to illustrate the benefits of this experimental approach.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 3; 806-811
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Negative Magnetoresistance of Layered High-t$\text{}_{c}$ Compounds
    Autorzy:
    Medvedev, Yu. V.
    Yampolskii, S. V.
    Lewandowski, S. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2011093.pdf
    Data publikacji:
    1999-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.72.Jt
    74.80.Dm
    Opis:
    Magnetoresistance of layered high-T$\text{}_{c}$ systems with quasi-two-dimensional superconductivity in magnetic field H applied parallel to superconducting planes was investigated theoretically. In such configuration an increase in the magnetic field intensity decreases the critical temperature of superconducting regions. It causes both a suppression of the gap parameter Δ and an increase in the tunneling current between the decoupled superconducting planes and, as a consequence, leads to negative magnetoresistance. The dependence of tunneling current on H was calculated for superconducting layer thickness d$\text{}_{S}$ smaller than the superconducting correlation length. The results can be used for analysis of current-voltage characteristics of both superconductor-insulator-superconductor and superconductor-insulator normal metal multilayered tunnel structures.
    Źródło:
    Acta Physica Polonica A; 1999, 96, 3-4; 501-504
    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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