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Перегляд Відділення фізики і астрономії за назвою

Репозиторій DSpace/Manakin

Перегляд Відділення фізики і астрономії за назвою

Сортувати за: Порядок: Результатів:

  • Validity of t–J approximation for extended Hubbard model with strong repulsion 
    Cheranovskii, V.O.; Klein, D.J.; Ezerskaya, E.V.; Tokarev, V.V. (Физика низких температур, 2018)
    It is shown that for finite cyclic systems described by two band Hubbard Hamiltonian with strong electron repulsion the reduction to effective t–J model may give incorrect description of the ground state symmetry due to ...
  • Van der Waals interaction between surface and particle with giant polarizability 
    Makhnovets, K.A. (Semiconductor Physics Quantum Electronics & Optoelectronics, 2016)
    We show that a nanoparticle with a “giant” polarizability α (i.e., with the polarizability volume α′ = α/4πε₀ significantly exceeding the particle volume) placed in the vicinity of a surface experiences a strongly increased ...
  • Variable range hopping in thin film with large dielectric constant 
    Shklovskii, B.I. (Физика низких температур, 2017)
    In a film with large dielectric constant κ the electric field of an electron spreads inside the film before exiting the film at large distances of order of κ d ( d is the film width). This leads to the logarithmic Coulomb ...
  • Variational approach to the calculation of the lowest Wannier exciton state in wide type-II single semiconductor quantum wells 
    Vertsimakha, G.V. (Semiconductor Physics Quantum Electronics & Optoelectronics, 2016)
    The possibility to change the spatial character of the Wannier exciton ground state in a wide single type-II semiconductor quantum well has been studied variationally. A heterostructure with the central layer forming a ...
  • Variational approach to the problem of energy spectrum of surface electrons over liquid-helium film 
    Sokolov, S.S. (Физика низких температур, 2004)
    The energies of first two subbands are calculated, within a variational approach, for electrons localized over the surface of a liquid-helium film covering a solid substrate. The results are obtained for arbitrary value ...
  • Variational two-particle wave equation in scalar quantum field theory 
    Darewych, J. (Condensed Matter Physics, 2000)
    We study two-particle systems in a model quantum field theory, in which scalar particles of different mass interact via a mediating scalar field. The Lagrangian of the model is reformulated using covariant Green's functions to ...
  • Variation of optical parameters of multilayer structures with thin silicon layers at laser annealing 
    Okhrimenko, O.B. (Semiconductor Physics Quantum Electronics & Optoelectronics, 2014)
    The experimental data on Raman scattering (RS) and optical absorption in structures with thin silicon layers on various substrates, as well as in multilayer quartz/Si/SiO₂, SiC/Si/SiO₂ and glass/Si₃N₄/Si/SiO₂ structures, ...
  • Variation of Subharmonic Function under Transformation of its Riesz Measure 
    Kudasheva, E.G.; Khabibullin, B.N. (Журнал математической физики, анализа, геометрии, 2007)
    The paper combines two aspects. First, it contains a compressed com- parative review of the well-known results on the change of growth of entire (subharmonic resp.) function under the shifts of its zeros (under T-shift of ...
  • Variations of the energy spectra of solar X-ray flares: interconnection with the photospheric, chromospheric, and magnetic activity of the Sun (1972−2001) 
    Kasinskii, V. (Кинематика и физика небесных тел, 2005)
    The problem of flare energy distribution of the Sun is strongly related to the power-law energy spectra of flares on the UV Ceti-type stars. In a preliminary study (1972–1993), the X-ray flare integral energy spectrum (IES) ...
  • Variations of the quasar radio spectra with period 130 h⁻¹ Mpc 
    Khodyachikh, M. (Кинематика и физика небесных тел, 2005)
    It is known that the spatial distribution of galaxies and quasars is structured at a scale LS = 130 h⁻¹Mpc. The same scale can be present at a spatial distribution of the physical characteristics of quasars. The search of ...
  • Variety of critical state nature manifestations 
    Soldatova, E.D. (Condensed Matter Physics, 1999)
    The thermodynamical method of studying the critical state is developed based on the constructive definition of the critical state by means of linear uniform equation systems and the study of the critical state stability criteria. ...
  • Various Types of Convergence of Sequences of Subharmonic Functions 
    Nguyen Van Quynh (Журнал математической физики, анализа, геометрии, 2015)
    Let υn(x) be a sequence of subharmonic functions in a domain G is subset of Rm. The conditions under which the convergence of υn(x), as a sequence of generalized functions, implies its convergence in the Lebesgue spaces ...
  • Varistor-like current-voltage characteristic of porous silicon 
    Vakulenko, O.V.; Kondratenko, S.V.; Shutov, B.M. (Semiconductor Physics Quantum Electronics & Optoelectronics, 1999)
    The porous silicon (PS) current-voltage characteristic (CVC) has measured in transverse and longitudinal applied electric field. The obtained CVC has a varistor-like shape. Besides the practical application this confirms ...
  • Vertical cloud distribution in the Uranian atmosphere 
    Kostogryz, N.M. (Advances in Astronomy and Space Physics, 2011)
    In this work, the vertical cloud distribution in the Uranian atmosphere is investigated. We used the method of determinination of the deviation scope of the real atmosphere from homogeneity conditions. The idea of this ...
  • Vertical spin transport in semiconductor heterostructures 
    Sankowski, P.; Kacman, P.; Majewski, J.A.; Dietl, T. (Физика низких температур, 2007)
    The Landauer—B ttiker formalism combined with the tight-binding transfer matrix method is employed to model vertical coherent spin transport within magnetization modulated semiconductor heterostructures based on GaAs. ...
  • Vibrational dynamical and thermodynamical characteristics of the superlattices based on the metal-hydrogen system 
    Feodosyev, S.B.; Gospodarev, I.A.; Grishaev, V.I.; Syrkin, E.S. (Физика низких температур, 2003)
    The phonon spectra and vibrational thermodynamical characteristics of the Pd-H superlattices are investigated. Results of our calculations give a possibility to agree the data of neutronographic and calorimetric experiments ...
  • Vibrational dynamics of solid molecular nitrogen to megabar pressures 
    Goncharov, A.F.; Gregoryanz, E.; Mao, H.-K.; Hemley, R.J. (Физика низких температур, 2001)
    We report the results of Raman and synchrotron infrared absorption measurements of several molecular phases of solid nitrogen to pressures above 100 GPa (300 K). Low- temperature vibrational spectra to 45 GPa are also ...
  • Vibrational states of hexagonal ZnO doped with Co 
    Kupchak, I.M.; Serpak, N.F.; Strelchuk, V.V.; Korbutyak, D.V. (Semiconductor Physics Quantum Electronics & Optoelectronics, 2015)
    Vibrational density of states of 12.5% cobalt doped bulk hexagonal ZnO has been studied using the density functional theory method. It has been shown that introduction of cobalt into ZnO leads to appearance of additional ...
  • Vibronic interaction in crystals with the Jahn-Teller centers in the elementary energy bands concept 
    Bercha, D.M.; Bercha, S.A.; Glukhov, K.E.; Sznajder, M. (Condensed Matter Physics, 2015)
    The order-disorder type phase transition caused by the vibronic interaction (collective Jahn-Teller effect) in a monoclinic CuInP₂S₆ crystal is analyzed. For this purpose, a trigonal protostructure model of CuInP₂S₆ is ...
  • VIII Ukrainian-Polish and III East-European Meeting on Ferroelectrics Physics 
    Автор відсутній (Condensed Matter Physics, 2007)
    This issue contains Proceedings of the VIII Ukrainian-Polish and III~East-European Meeting on Ferroelectrics Physics (Ukr-Pol 8) held in Lviv on September 4--7, 2006. The Meeting was the continuation of the common ...

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