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  • On controllability problems for the wave equation on a half-plane 
    Fardigola, L.V. (Журнал математической физики, анализа, геометрии, 2005)
    Necessary and sufficient conditions for null-controllability and approximate null-controllability are obtained for the wave equation on a half-plane. Controls solving these problems are found explicitly. Moreover bang-bang ...
  • On convergence of generators of equilibrium dynamics of hopping particles to generator of a birth-and-death process in continuum 
    Lytvynov, E.; Polara, P.T. (Condensed Matter Physics, 2008)
    We deal with the two following classes of equilibrium stochastic dynamics of infinite particle systems in continuum: hopping particles (also called Kawasaki dynamics), i.e., a dynamics where each particle randomly hops over ...
  • On Convergence of Solutions of Singularly Perturbed Boundary-Value Problems 
    Anoshchenko, O.; Lysenko, O.; Khruslov, E. (Журнал математической физики, анализа, геометрии, 2009)
    A perturbation of the Poisson equation by a biharmonic operator with a small multiplier ε is considered. The asymptotic behavior of the solution of the Dirichlet problem for this equation as ε → 0 is studied. The gradient ...
  • On convergence theory for Beltrami equations 
    Ryazanov, V.; Srebro, U.; Yakubov, E. (2008)
    This paper is devoted to convergence theorems which play an important role in our scheme for deriving theorems on the existence of solutions of the Beltrami equations.
  • On (co)pure Baer injective modules 
    Hamid, M.F. (Algebra and Discrete Mathematics, 2021)
    For a given class of R-modules Q, a module M is called Q-copure Baer injective if any map from a Q-copure left ideal of R into M can be extended to a map from R into M. Depending on the class Q, this concept is both a ...
  • On correlated heterogeneities of glass-forming liquids 
    Bakai, A.S. (Физика низких температур, 2002)
    The thermodynamics and structure of glass-forming liquids are considered within the framework of the heterophase fluctuation (HPF) model. The main goal of the theory developed is to fined for a description of the long-range ...
  • On cospectral signed digraphs 
    Bhat, M.A.; Naikoo, T.A.; Pirzada, S. (Algebra and Discrete Mathematics, 2019)
    The set of distinct eigenvalues of a signed digraph S together with their respective multiplicities is called its spectrum. Two signed digraphs of same order are said to be cospectral if they have the same spectrum. In ...
  • On countable almost invariant partitions of g-spaces 
    Kharazishvili, A.B. (Український математичний журнал, 2014)
    For any σ -finite G-quasiinvariant measure μ given in a G-space, which is G-ergodic and possesses the Steinhaus property, it is shown that every nontrivial countable μ-almost G-invariant partition of the G-space has a ...
  • On creation of a cathode units for the X -band klystron using a high-current magnetron gun as a base 
    Dovbnya, A.N.; Ayzatsky, N.I.; Boriskin, V.N.; Zakutin, V.V.; Kushnir, V.A.; Mitrochenko, V.A.; Reshetnyak, N.G.; Perezhogin, S.A.; Stepin, D.L. (Вопросы атомной науки и техники, 2004)
    The article presents the results from studies, performed at the R&D “Accelerator” NSC KIPT, on development of units for the X-band klystron with an output power 1...2 MW and at a voltage 50...100 kV. A magnetron gun with ...
  • On critical parameters of photonuclear isotope production 
    Uvarov, V.L. (Вопросы атомной науки и техники, 2019)
    Analytical model for description of isotope generation in a thick production target exposed to no uniform flux of high-energy bremsstrahlung radiation is developed. A set of principal process parameters determinative the ...
  • On Cyclic Functions in Weighted Hardy Spaces 
    Dilnyi, V. (Журнал математической физики, анализа, геометрии, 2011)
  • On Darboux's Approach to R-Separability of Variables 
    Sym, A.; Szereszewski, A. (Symmetry, Integrability and Geometry: Methods and Applications, 2011)
    We discuss the problem of R-separability (separability of variables with a factor R) in the stationary Schrödinger equation on n-dimensional Riemann space. We follow the approach of Gaston Darboux who was the first to give ...
  • On decompilation of VLIW executable files 
    Jakub, K. (Проблеми програмування, 2015)
    Machine-code decompilation (i.e. reverse program compilation) is a process often used in reverse engineering. Its task is to transform a platform-specific executable file into a high-level language representation, which ...
  • On decompositions of affine Coxeter groups in semi-direct products 
    Jushenko, E. (Algebra and Discrete Mathematics, 2004)
    In this paper we study affine Coxeter groups. We show how to construct decompositions of the investigated groups into semi-direct products. We use this to give the complete list of irreducible representations of affine ...
  • On Deformations and Contractions of Lie Algebras 
    Fialowski, A.; Marc de Montigny (Symmetry, Integrability and Geometry: Methods and Applications, 2006)
    In this contributed presentation, we discuss and compare the mutually opposite procedures of deformations and contractions of Lie algebras. We suggest that with appropriate combinations of both procedures one may construct ...
  • On derived π-length of a finite π-solvable group with supersolvable π-Hall subgroup 
    Monakhov, V.S.; Gritsuk, D.V. (Algebra and Discrete Mathematics, 2013)
    It is proved that if π-Hall subgroup is a supersolvable group then the derived π-length of a π-solvable group G is at most 1 + maxr∈π lαr(G), where lαr(G) is the derived r-length of a π-solvable group G.
  • On Designing Constant-Stress Partially Accelerated Life Tests under Time-Censoring 
    Ismail, A.A. (Проблемы прочности, 2014)
    It is not easy to obtain more failure data from products with high quality and long life at normal (use) condition. Thus, accelerated tests are needed in this respect. This paper considers the constant-stress partially ...
  • On Designing Time-Censored Step-Stress Life Test for the Burr Type-XII Distribution 
    Ismail, Ali A.; Al-Habardi, K. (Проблемы прочности, 2017)
    This article presents the optimal designing of time step-stress partially accelerated life test (PALT) under censored data from two-parameter Burr type-XII distribution. The maximum likelihood (ML) approach is used to ...
  • On determination of mean values of observed quantities according to O. Ya. Orlov 
    Tyshchuk, M.; Gozhy, A. (Кинематика и физика небесных тел, 2005)
    The definition of O.Ya.Orlov for mean values of observed quantities for any epoch suits for application not only in astronomy, and in geophysics, geodesy, meteorology. The method of seasonal decomposition and adjustment ...
  • On differentiability of solution to stochastic differential equation with fractional Brownian motion 
    Mishura, Yu.S.; Shevchenko, G.M. (2007)
    Stochastic differential equation with pathwise integral with respect to fractional Brownian motion is considered. For solution of such equation, under different conditions, the Malliavin differentiability is proved. Under ...