Results 31 to 40 of about 15,028 (168)
Communications Chemistry, 2022 Infrared spectroscopy-based diffraction tomography has a high potential to be used for 3D reconstruction of intact samples, however, the inverse problem is highly non-linear and remains challenging.
Eirik Almklov Magnussen +11 more
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Fractal and Fractional, 2023 The paper considers the solvability of some inverse problems for fractional differential equations with a nonlocal biharmonic operator, which is introduced with the help of involutive transformations in two space variables.
Moldir Muratbekova +3 more
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Quantitative Spectral Data Analysis Using Extreme Learning Machines Algorithm Incorporated with PCA
Algorithms, 2021 Extreme learning machine (ELM) is a popular randomization-based learning algorithm that provides a fast solution for many regression and classification problems.
Michael Li +3 more
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Inverse Spectral Problems for Weighted Graphs
Mohyla Mathematical Journal, 2022 The paper is devoted to inverse spectral problems for weighted graphs. We give the sharp upper bound for spectral reconstruction number of trees and unicyclic graphs.
Pylypiva, Oleksandra +1 more
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Mathematics, 2023 In this paper, an approach to solving direct and inverse scattering problems on the half-line for a one-dimensional Schrödinger equation with a complex-valued potential that is exponentially decreasing at infinity is developed.
Vladislav V. Kravchenko +1 more
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Etudes for the inverse spectral problem
Journal of the London Mathematical Society, 2023 AbstractIn this note, we study inverse spectral problems for canonical Hamiltonian systems, which encompass a broad class of second‐order differential equations on a half‐line. Our goal is to extend the classical results developed in the work of Marchenko, Gelfand–Levitan, and Krein to broader classes of canonical systems and to illustrate the solution
Makarov, Nikolai G., Poltoratski, Alexei
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Inverse Spectral Problems for Sturm-Liouville Operators with Transmission Eonditions
پژوهشهای ریاضی, 2020 : This paper deals with the boundary value problem involving the differential equation -y''+q(x)y=lambda y subject to the standard boundary conditions along with the following discontinuity conditions ...
Mohammad Shahriari
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Inverse Problems for the Quadratic Pencil of the Sturm-Liouville Equations with Impulse
Abstract and Applied Analysis, 2013 In this study some inverse problems for a boundary value problem generated with a quadratic pencil of Sturm-Liouville equations with impulse on a finite interval are considered.
Rauf Kh. Amırov, A. Adiloglu Nabıev
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Inverse spectral problems for certain differential operators [PDF]
Pacific Journal of Mathematics, 1984 Soit L o un operateur differentiel donne a matrice spectrale (ρ ij o ); soit une mesure matricielle positive (ρ ij ). On donne la technique pour construite L a partir de (ρ ij ) et (ρ ij o )
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Inverse spectral problems for nonlinear Sturm-Liouville problems
Electronic Journal of Differential Equations, 2007 This paper concerns the nonlinear Sturm-Liouville problem $$ -u''(t) + f(u(t)) = lambda u(t), quad u(t) > 0, quad t in I := (0, 1), quad u(0) = u(1) = 0, $$ where $lambda $ is a positive parameter. We try to determine the nonlinear term $f(u)$ by means
Tetsutaro Shibata
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