Results 71 to 80 of about 17,645 (222)
Canadian Journal of Statistics, Volume 53, Issue 4, December 2025.Abstract Modern longitudinal data from wearable devices consist of biological signals at high‐frequency time points. Distributed statistical methods have emerged as a powerful tool to overcome the computational burden of estimation and inference with large data, but methodology for distributed functional regression remains limited.
Cole Manschot, Emily C. Hector
wiley +1 more source
A Conforming Least Squares Approach for the Numerical Approximation of Parabolic Equations
PAMM, Volume 25, Issue 4, December 2025.ABSTRACT We propose a least squares formulation for the numerical approximation of parabolic partial differential equations, which minimizes the residual of the equation using the natural L2(0,T;H−1(Ω))$L^2(0,T;H^{-1}(\Omega))$ norm. In particular, we avoid making regularity assumptions on the problem's data.
Michael Hinze +2 more
wiley +1 more source
Frequency Response Analysis of State Space Models for Time Series Analysis
Earth and Space Science, Volume 12, Issue 12, December 2025.Abstract State space models are well‐suited for time series in which the evolution of variables cannot be well represented by deterministic basis functions. A key challenge in using state space models is the selection of the noise variance parameters. To better understand their impact on the model's filtering behavior, we derive the frequency response ...
Koen Haakman +2 more
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Thermal Resistance of 1D Micron‐Wide Interface Under External Force Modulation
Advanced Materials Interfaces, Volume 12, Issue 22, November 22, 2025.A novel TET‐based technique is developed to characterize the interfacial thermal resistance at the microscale. The interfacial thermal resistance is measured at ≈1200–1400 mK/W for natural contact. Externally applied force reduces the thermal resistance dramatically down to ≈125 mK/W.
Amin Karamati +3 more
wiley +1 more source
, 2015 Basing on a modification of the "Dichotomy Algorithm" (Terekhov, 2010), we propose a parallel procedure for solving tridiagonal systems of equations with Toeplitz matrices.
Terekhov, Andrew V.
core +1 more source
Toeplitz matrices commuting with tridiagonal matrices
Linear Algebra and its Applications, 1981 Abstractwe prove that if R is a nonscalar Toeplitz matrix Ri, j=r∦i−j∦ which commutes with a tridiagonal matrix with simple spectrum, then rkr1=uk-1r2r1cos puk-1(cos p), k=4, 5,…, with Uk the Chebychev polynomial of the second kind, where p is determined from cos p=12r21−r1r3r22−r1r3.
openaire +2 more sources
Spectra of Tridiagonal Matrices
, 2017 20 pages, 5 ...
Veerman, J. J. P. +2 more
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Shell extremal eigenvalues of tridiagonal Toeplitz Matrices
The Electronic Journal of Linear Algebra, 2023 The shell of a complex tridiagonal Toeplitz matrix is studied. Closed formulas for all quantities involved in its equation are presented. Necessary and sufficient conditions for a Toeplitz tridiagonal matrix to have shell extremal eigenvalues are given.
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Dispersion of First Sound in a Weakly Interacting Ultracold Fermi Liquid
Annalen der Physik, Volume 537, Issue 11, November 2025.The weak‐interaction, low‐temperature region of the phase diagram of a Fermi gas the so‐called Fermi liquid regime, which has been somewhat overlooked in ultracold gases‐is investigated. Precise and measurable predictions are presented for the viscosity and dispersion of first sound to leading order in the scattering length.
Thomas Repplinger +4 more
wiley +1 more source
On a Discrete Inverse Problem for Two Spectra
Discrete Dynamics in Nature and Society, 2012 A version of the inverse spectral problem for two spectra of finite-order real Jacobi matrices (tridiagonal symmetric matrices) is investigated. The problem is to reconstruct the matrix using two sets of eigenvalues: one for the original Jacobi matrix ...
Gusein Sh. Guseinov
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