Results 71 to 80 of about 511,937 (269)
PLANTS, PEOPLE, PLANET, EarlyView.Forest management for wood products involves the conversion of primary forests to younger plantations. This has an immediate impact on biota such as ectomycorrhizal fungi, a diverse symbiotic fungal community. Alternatives to large clearcuts may be one way to mitigate harvesting effects.
Olivia M. Rianhard +4 more
wiley +1 more source
A Strong Szegő Theorem for Jacobi Matrices [PDF]
Communications in Mathematical Physics, 2007 We use a classical result of Gollinski and Ibragimov to prove an analog of the strong Szego theorem for Jacobi matrices on $l^2(\N)$. In particular, we consider the class of Jacobi matrices with conditionally summable parameter sequences and find necessary and sufficient conditions on the spectral measure such that $\sum_{k=n}^\infty b_k$ and $\sum_{k ...
openaire +3 more sources
A Physics‐Informed Learning Framework to Solve the Infinite‐Horizon Optimal Control Problem
International Journal of Robust and Nonlinear Control, EarlyView.ABSTRACT We propose a physics‐informed neural networks (PINNs) framework to solve the infinite‐horizon optimal control problem of nonlinear systems. In particular, since PINNs are generally able to solve a class of partial differential equations (PDEs), they can be employed to learn the value function of the infinite‐horizon optimal control problem via
Filippos Fotiadis +1 more
wiley +1 more source
Spectral results for perturbed periodic Jacobi matrices using the discrete Levinson technique [PDF]
, 2017 For an arbitrary Hermitian period-$T$ Jacobi operator, we assume a perturbation by a Wigner-von Neumann type potential to devise subordinate solutions to the formal spectral equation for a (possibly infinite) real set, $S$, of the spectral parameter.
Edmund Judge, S. Naboko, I. Wood
semanticscholar +1 more source
Systems Research and Behavioral Science, EarlyView.ABSTRACT Efficient allocation of financial resources through policy interventions is vital for fostering grassroots sports and promoting preventive health measures. However, the intricacies of impact‐oriented grassroots sports subsidies are shaped by factors within a specific funding cascade and the broader societal context.
Liliya Satalkina +2 more
wiley +1 more source
The mean spectral measures of random Jacobi matrices related to Gaussian beta ensembles [PDF]
, 2015 An explicit formula for the mean spectral measure of a random Jacobi matrix is derived. The matrix may be regarded as the limit of Gaussian beta ensemble (G$\beta$E) matrices as the matrix size $N$ tends to infinity with the constraint that $N \beta $ is
Trinh Khanh Duy, T. Shirai
semanticscholar +1 more source
Multiphysics Simulation Methods in Computer Graphics
Computer Graphics Forum, EarlyView.Abstract Physics simulation is a cornerstone of many computer graphics applications, ranging from video games and virtual reality to visual effects and computational design. The number of techniques for physically‐based modeling and animation has thus skyrocketed over the past few decades, facilitating the simulation of a wide variety of materials and ...
Daniel Holz +5 more
wiley +1 more source
On Fourier Series in the Context of Jacobi Matrices
AxiomsWe investigate the properties of matrices that emerge from the application of Fourier series to Jacobi matrices. Specifically, we focus on functions defined by the coefficients of a Fourier series expressed in orthogonal polynomials.
José M. A. Matos +2 more
doaj +1 more source
Spectral analysis of variable-order multi-terms fractional differential equations
Open Physics, 2023 In this work, a numerical scheme based on shifted Jacobi polynomials (SJPs) is deduced for variable-order fractional differential equations (FDEs). We find numerical solution of consider problem of fractional order. The proposed numerical scheme is based
Shah Kamal +3 more
doaj +1 more source
Mathematics, 2023 In this research, we provide sufficient conditions to prove the existence of local and global solutions for the general two-dimensional nonlinear fractional integro-differential equations. Furthermore, we prove that these solutions are unique.
Tahereh Eftekhari, Jalil Rashidinia
doaj +1 more source