Zobrazeno 1 - 10
of 190
pro vyhledávání: '"N. Koleva"'
Autor:
S. Stefanov, N. Stoyanov, N. Koleva, D. Mikova, A. Yordanov, Z. Pavlova, E. Kinova, I. Petrova, L. Demirevska, T. Todorov, T. Chamova, M. Garcheva, A. Kundurdjiev, A. Todorova, I. Tournev, Y. Palashev, I. Daskalov, M. Dimova, I. Gruev, Y. Yotov, A. Goudev, V. Velchev, Mariana Gospodinova
Publikováno v:
Българска кардиология, Vol 30, Iss 2, Pp 70-82 (2024)
Introduction: Transthyretin amyloid cardiomyopathy (ATTR-CM) is a severe progressive disease, more common than previously expected. The main objectives were to evaluate hereditary and wild type ATTR-CM frequency and clinical manifestations. Material
Externí odkaz:
https://doaj.org/article/dbba1ecd13bf4efa9afc24a3acd3556a
Publikováno v:
Българска кардиология, Vol 30, Iss 2, Pp 7-25 (2024)
The 2023 European Society of Cardiology guidelines for the management of cardiomyopathies (CM) provide practical recommendations for diagnosis and treatment. They emphasize on the need for a systematic clinical evaluation beginning with clinical susp
Externí odkaz:
https://doaj.org/article/e8a792344f444221897fd08be72fcc6c
Autor:
Miglena N. Koleva, Lubin G. Vulkov
Publikováno v:
Applied Sciences, Vol 14, Iss 13, p 5949 (2024)
The mathematical analysis of viscous magnetohydrodynamics (MHD) models is of great interest in recent years. In this paper, a finite element Galerkin method is employed for the estimation of an unknown time-dependent convection coefficient and source
Externí odkaz:
https://doaj.org/article/04f7b43ea2e642c79422e1dac90fd006
Autor:
Miglena N. Koleva, Lubin G. Vulkov
Publikováno v:
Mathematics, Vol 12, Iss 11, p 1748 (2024)
A body may have a structural, thermal, electromagnetic or optical role. In wave propagation, many models are described for transmission problems, whose solutions are defined in two or more domains. In this paper, we consider an inverse source hyperbo
Externí odkaz:
https://doaj.org/article/415ad1476e8940bda6756b689504100a
Autor:
Miglena N. Koleva, Lubin G. Vulkov
Publikováno v:
Mathematics, Vol 12, Iss 10, p 1499 (2024)
In this paper, two-dimensional (2D) heat equations on disjoint rectangles are considered. The solutions are connected by interface Robin’s-type internal conditions. The problem has external Dirichlet boundary conditions that, in the forward (direct
Externí odkaz:
https://doaj.org/article/5af0f9032aac4a0a89923a90b39eb1ec
Autor:
Miglena N. Koleva, Lubin G. Vulkov
Publikováno v:
Fractal and Fractional, Vol 8, Iss 4, p 196 (2024)
This paper is concerned with solving the problem of identifying the control vector problem for a fractional multi-order system of nonlinear ordinary differential equations (ODEs). We describe a quasilinearization approach, based on minimization of a
Externí odkaz:
https://doaj.org/article/f9639cd4601e4e55aed1951eb55bd21b
Autor:
Miglena N. Koleva, Lubin G. Vulkov
Publikováno v:
Mathematics, Vol 12, Iss 2, p 299 (2024)
A time stepping quasilinearization approach to the mixed (or coupled) form of one and two dimensional Richards’ equations is developed. For numerical solution of the linear ordinary differential equation (ODE) for 1D case and elliptic for 2D case,
Externí odkaz:
https://doaj.org/article/e95ad7b4d2e04dd8a9368ab159776105
Autor:
Miglena N. Koleva, Lubin G. Vulkov
Publikováno v:
Axioms, Vol 13, Iss 1, p 64 (2024)
In this work, we consider Cauchy-type problems for Laplace’s equation with a dynamical boundary condition on a part of the domain boundary. We construct a discrete-in-time, meshless method for solving two inverse problems for recovering the space
Externí odkaz:
https://doaj.org/article/caf959d1caad4bd3bdd20633c58fed86
Publikováno v:
Symmetry, Vol 15, Iss 12, p 2099 (2023)
We consider an inverse problem of recovering the mortality rate in the honey bee difference equation model, that tracks a forage honeybee leaving and entering the hive each day. We concentrate our analysis to the model without pesticide contamination
Externí odkaz:
https://doaj.org/article/6f5f4c36f3f347d781305cb5c2605397
Autor:
Miglena N. Koleva, Lubin G. Vulkov
Publikováno v:
Computation, Vol 11, Iss 10, p 204 (2023)
The retrospective inverse problem for evolution equations is formulated as the reconstruction of unknown initial data by a given solution at the final time. We consider the inverse retrospective problem for a one-dimensional parabolic equation in two
Externí odkaz:
https://doaj.org/article/b19ae1f9585d4bdfaacf84bd89c893e9