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Sökning: hsv:(NATURVETENSKAP) > Ryska

  • Resultat 1-10 av 123
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1.
  • Kozlov, Alexander, et al. (författare)
  • About dynamics of publication activity on synchronization
  • 2022
  • Ingår i: Izvestiya VUZ. Applied Nonlinear Dynamics. - : Saratov State University. - 0869-6632 .- 2542-1905.
  • Tidskriftsartikel (refereegranskat)abstract
    • Purpose of the work is to research of the world science publications dynamics on the synchronization. Methods. The research methods are the statistical methods of data processing. Results. The emphasis in the study of synchronization over the past twenty years has shifted from physical and technical sciences to neuroscience with Asian countries domination.
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2.
  • Shestopalov, Yury, 1953-, et al. (författare)
  • Alternative conception of the monitoring and optimization of water flooding of oil reservoirs  under instability of displacement front
  • 2019
  • Ingår i: Oil industry (Neftyanoye khozyaystvo). - Moscow. - 0028-2448. ; :12, s. 118-123
  • Tidskriftsartikel (refereegranskat)abstract
    • The theory of Buckley and Leverett does not take into account the loss of stability of the displacement front whch provokes a stepwise change and the triple value of water saturation. Traditionally a mathematically simplified approach was proposed: a differentiable approximation to eliminate the ' jump' in water saturation. Such a simplified solution led to negative consequences well-know from the water flooding practice, recognized by experts as 'viscous instability of the displacement front' and 'fractal geometry of the displacement front'.The core of the issue is to attempt to predict the beginning of the stability loss of the front of oil displacement by water and to prevent its negative effect on the water flooding process under difficult conditions of interaction of hydro-thermodynamic, capillary, molecular, inertial, and gravitational forces. In this study, catastrophe theory methods applied for the analysis of nonlinear polynomial dynamical systems are used as a novel approach. namely, a mathematical growth model is developed and an inverse problem is formulated so that the initial coefficients of the system of differential equations for a two-phase flow can be determined using this model. A unified control parameter has been selected which enables one to propose and validate a discriminant criterion for  oil and water growth models for monitoring and optimization.
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3.
  • Adeyev, V.M., et al. (författare)
  • Features of auger-investigations of ultrathin periodic metallic film structures
  • 2006
  • Ingår i: Metallofizika i novejsie tehnologii. - 1024-1809. ; 28:2, s. 193-200
  • Tidskriftsartikel (refereegranskat)abstract
    • In the presented work the applicability of Auger Electron Spectroscopy for studying layered metal film structures Fe/(Au, Cu)/Tb on Si substrate with thickness of layers up to 30 Å was shown. It was ascertained that Fe layer is interacting with Si substrate and as a result Fe-silicide is formed. The thickness of buffer layers aimed to protect Fe layer appeared to be insufficient for complete suppression of silicide formation
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6.
  • Asekritova, Irina, et al. (författare)
  • Interpolation of Besov spaces in the nondiagonal case
  • 2006
  • Ingår i: St. Petersburg Mathematical Journal. - 1061-0022 .- 1547-7371. ; 18:4, s. 1-9
  • Tidskriftsartikel (refereegranskat)abstract
    • In the nondiagonal case, interpolation spaces for a collection of Besov spaces are described. The results are consequences of the fact that, whenever the convex hull of points (formula presented) includes a ball of ℝm+1, we have (formula presented).
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8.
  • Astashkin, S., et al. (författare)
  • On interpolation in Lp-spaces
  • 2003
  • Ingår i: Mathematical notes of the Academy of Sciences of the USSR. - : Steklov Mathematical Institute. - 0001-4346 .- 1573-8876. ; 74:5, s. 782-786
  • Tidskriftsartikel (refereegranskat)
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