No. 4 (2021): Reports of the National Academy of Sciences of Ukraine

View No. 4 (2021): Reports of the National Academy of Sciences of Ukraine

№ 4 (2021): Доповіді Національної академії наук України

DOI: https://doi.org/10.15407/dopovidi2021.04
Published: 18.03.2026

Mathematics

  • Fredholm boundary- value problems with parameter in Sobolev— Slobodetsky spaces

    V.A. Mikhailets, T.B. Skorobohach
    3-8
    DOI: https://doi.org/10.15407/dopovidi2021.04.003

  • Flags of subalgebras in contracted Lie algebras

    D. R. Popovych
    9-17
    DOI: https://doi.org/10.15407/dopovidi2021.04.009

  • An extremal problem for the invariant differential operators on a class of Cauchy-type integrals

    V.V. Savchuk, M.V. Savchuk
    18-23
    DOI: https://doi.org/10.15407/dopovidi2021.04.018

  • On the primitive irreducible representations of finitely generated nilpotent groups

    A.V. Tushev
    24-27
    DOI: https://doi.org/10.15407/dopovidi2021.04.024

Information Science and Cybernetics

  • Convergence of the operator extrapolation method

    V.V. Semenov, D.S. Siryk, O.S. Kharkov
    28-35
    DOI: https://doi.org/10.15407/dopovidi2021.04.028

Mechanics

Materials Science

  • Electrophysical properties of A3 IILaNb3O12 (AII = Sr, Ba) with slab perovskite-like structure

    Y.A. Titov, M.S. Slobodyanik, R.N. Kuzmin, V.V. Chumak
    53-60
    DOI: https://doi.org/10.15407/dopovidi2021.04.053

Geosciences

Chemistry

  • Sorption of ions Cu(II), Cd(II), Co(II), Zn(II), and Cr(VI) by a composite sorbent on the base of nano-sized iron

    I.A. Kovalchuk, I.V. Pylypenko, V.Yu. Tobilko, B.Yu. Kornilovych
    70-76
    DOI: https://doi.org/10.15407/dopovidi2021.04.070

  • A new method for the synthesis of nanomaterials for the needs of nanotechnologies

    O.M. Korduban, T.V. Kryshchuk, M.M. Medvedskij
    77-85
    DOI: https://doi.org/10.15407/dopovidi2021.04.077

Biology

  • Bioclimatic factors and the course of the COVID-19 pandemic in Europe: the place of Ukraine

    S.V. Mezhzherin, I.I. Kozynenko, V.M. Tytar
    86-93
    DOI: https://doi.org/10.15407/dopovidi2021.04.086

Biochemistry

Biophysics