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Träfflista för sökning "hsv:(NATURVETENSKAP) hsv:(Annan naturvetenskap) ;pers:(Shestopalov Yury 1953)"

Sökning: hsv:(NATURVETENSKAP) hsv:(Annan naturvetenskap) > Shestopalov Yury 1953

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  • Sheina, Elena, et al. (författare)
  • Optimal parameters of experiment for determining dielectric constant of a layer in a rectangular waveguide
  • 2020
  • Konferensbidrag (refereegranskat)abstract
    • The inverse problem is considered of reconstructing real permittivity of a plane-parallel layer in a perfectly conducting rectangular waveguide from experimental data using explicit expression for the scattering matrix. This problem is incorrect because of the presence of self-intersection points on the scattering coefficients curves on the complex plane. It is shown that the traditional multi-frequency method of measurements applied in vector network analyzers can be justified using the fact that the algorithm for processing the measurement results that employs least squares becomes stable if the number of frequencies is large enough.
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  • 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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