Results 21 to 30 of about 44,343,636 (185)
Neural Mechanisms of Feedback Processing and Regulation Recalibration During Neurofeedback Training. [PDF]
Hum Brain MappWe conducted a pre‐registered mega‐analysis of eight fMRI neurofeedback studies, finding feedback associated with activity in the reward system, attention, and default mode networks, as well as with connectivity in the salience network. No positive results appeared in regulation blocks, but recalibration may have occurred during feedback presentation ...
Pamplona GSP +15 more
europepmc +2 more sources
Two generalized Tricomi equations [PDF]
, 2021 In this note we give existence results for the generalized Tricomi equations Ru′ ′+ Bu= f and (Ru′)′+Bu=f with suitable boundary data where R may be an operator (or a function) depending also on time assuming positive, null and negative sign, while B is ...
Paronetto F.
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Krylov complexity and orthogonal polynomials
Nuclear Physics B, 2022 Krylov complexity measures operator growth with respect to a basis, which is adapted to the Heisenberg time evolution. The construction of that basis relies on the Lanczos algorithm, also known as the recursion method.
Wolfgang Mück, Yi Yang
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Existence of Running Solutions in a Relativistic Tricomi’s Equation Using Perturbation Theory
Mediterranean Journal of Mathematics, 2023 We use perturbation methods to establish the existence of a second kind periodic solution (running solution) of a nonlinear Tricomi’s equation type under relativistic effects. First, we estimate conditions for the existence of either an equilibrium point
Z. Daniel Cortés, G. A. Gutiérrez
semanticscholar +1 more source
Blow-up and lifespan estimate for the generalized Tricomi equation with mixed nonlinearities [PDF]
Advances in Pure and Applied Mathematics, 2020 We study in this article the blow-up of the solution of the generalized Tricomi equation in the presence of two mixed nonlinearities, namely we consider $$ (Tr) \hspace{1cm} u_{tt}-t^{2m}\Delta u=|u_t|^p+|u|^q, \quad \mbox{in}\ \mathbb{R}^N\times[0 ...
M. Hamouda, M. Hamza
semanticscholar +1 more source
, 1986 The Tricomi equation is solved by the decomposition method[6–8] on the half-space x, y > 0 and also for suitable boundary conditions given on the Boundary of the hyperbolic-elliptic ...
Bellomo, N. +3 more
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Bessel Integrals and Fundamental Solutions for a Generalized Tricomi Operator [PDF]
, 2001 The method of partial Fourier transform is used to find explicit formulas for two remarkable fundamental solutions for a generalized Tricomi operator. These fundamental solutions reflect clearly the mixed type of the Tricomi operator.
Cardoso, Fernando +3 more
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Boundary Value Problems with Integral Gluing Conditions for Fractional-Order Mixed-Type Equation
International Journal of Differential Equations, 2011 Analogs of the Tricomi and the Gellerstedt problems with integral gluing conditions for mixed parabolic-hyperbolic equation with parameter have been considered.
A. S. Berdyshev +2 more
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THE BOUNDARY VALUE PROBLEM FOR THIRD ORDER EQUATION OF PARABOLIC–HYPERBOLIC TYPE [PDF]
Vestnik KRAUNC: Fiziko-Matematičeskie Nauki, 2019 In this paper we study the boundary value problem for third order equation of parabolic-hyperbolic type. The existence and uniqueness theorem of a regular solution is proved. The solution to the problem under study was found explicitly.
R. Kh. Makaova
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Existence and uniqueness for some equation of a mixed elliptic-hyperbolic type
Boundary Value Problems, 2019 In the paper, we prove results on existence and uniqueness of weak solutions for closed Dirichlet problem for a transonic flow model, and interior regularity results are also given in the important special case of the Tricomi equation.
Zhang Haixia, Xiao Wei
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