Results 81 to 90 of about 511,937 (269)
Conservation Biology, EarlyView.Abstract As nations seek to expand protected area (PA) networks to cover 30% of land and seas by 2030 (30×30), there is an urgent need for systematic conservation planning and spatial prioritization that considers the broad range of ecological and socioeconomic factors influencing the persistence of biodiversity.
Edmond Sacre +2 more
wiley +1 more source
The asymptotical spectrum of Jacobi matrices
Journal of Computational and Applied Mathematics, 1977 AbstractA method to calculate the asymptotical eigenvalue density (asymptotical density of zeros) ρ(x) of Jacobi matrices (orthogonal polynomials) in terms of its moments is presented. This method does not require the convergence of continued fractions and inversion of functional transformations as previous ones do.
openaire +2 more sources
Relaxation parameters and composite refinement techniques
Results in Applied Mathematics, 2022 A composite refinement technique for two stationary iterative methods, one of them contains a relaxation parameter, is introduced. Four new techniques, Jacobi successive over relaxation (SOR) composite refinement (RJSOR), SOR Jacobi composite refinement (
Sh.A. Meligy, I.K. Youssef
doaj
Journal of Child Psychology and Psychiatry, EarlyView.Background Both genetic and environmental factors contribute to the risk of developing disordered eating, with twin studies demonstrating environmental factors moderate genetic susceptibility. To date, gene–environment interactions leveraging polygenic risk scores (PRS) have not been studied in disordered eating phenotypes beyond anorexia nervosa (AN).
Madeleine Curtis +6 more
wiley +1 more source
Media amplification under the floodlight: Contextualizing 20 years of US risk news
Risk Analysis, EarlyView.Abstract This paper addresses the question of identifying and distinguishing risk amplification incidents and patterns in the news media. To meet this objective, our study incorporates a novel “floodlight” approach utilizing the Society for Risk Analysis Glossary in conjunction with topic modeling and time‐series analysis, to investigate risk‐focused ...
Cormac Bryce +3 more
wiley +1 more source
An inverse theorem for Jacobi matrices
Linear Algebra and its Applications, 1975 AbstractIt is shown that if two infinite Jacobi matrices of type D have the same spectrum {λi}∞1 and if ʃλ+0λ−0dσ∗(t), then they are identical. Here σ(t) and σ∗(t) are the weight functions associated with the two matrices.
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Spectral averaging techniques for Jacobi matrices [PDF]
Journal of Mathematical Physics, 2008 Spectral averaging techniques for one-dimensional discrete Schrödinger operators are revisited and extended. In particular, simultaneous averaging over several parameters is discussed. Special focus is put on proving lower bounds on the density of the averaged spectral measures.
Carmen Martinez +2 more
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The Stenger conjectures and the A-stability of collocation Runge-Kutta methods
Journal of Inequalities and Applications, 2023 Stenger conjectures are claims about the location of the eigenvalues of matrices whose elements are certain integrals involving basic Lagrange interpolating polynomials supported on the zeros of orthogonal polynomials. In this paper, we show the validity
Rachid Ait-Haddou, Hoda Alselami
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On classical solutions and canonical transformations for Hamilton–Jacobi–Bellman equations
Bulletin of the London Mathematical Society, EarlyView.Abstract In this note, we show how canonical transformations reveal hidden convexity properties for deterministic optimal control problems, which in turn result in global existence of Cloc1,1$C^{1,1}_{loc}$ solutions to first‐order Hamilton–Jacobi–Bellman equations.
Mohit Bansil, Alpár R. Mészáros
wiley +1 more source
Construction of Fractional Pseudospectral Differentiation Matrices with Applications
AxiomsDifferentiation matrices are an important tool in the implementation of the spectral collocation method to solve various types of problems involving differential operators.
Wenbin Li, Hongjun Ma, Tinggang Zhao
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