Results 161 to 170 of about 382,986 (293)

On Symmetries of Hyperbolic Lattices of Large Rank

Mathematische Nachrichten, EarlyView.
ABSTRACT For an even, integral hyperbolic lattice L$L$, the symmetry group of L$L$ is the quotient of the group of positive isometries of L$L$ by the Weyl subgroup of (−2)$(-2)$‐reflections. Following Nikulin, the exceptional lattice of L$L$ is defined as the sublattice generated by elements that have finite orbit under the symmetry group of L$L$.
Torben Grabbel, Gebhard Martin, Giacomo Mezzedimi, Maia Raitz von Frentz, Paul Jakob Schmidt   +4 more
wiley   +1 more source

An All‐At‐Once Solver for Visco‐Acoustic Full Waveform Inversion in the Time‐Domain

Mathematical Methods in the Applied Sciences, EarlyView.
ABSTRACT Full waveform inversion (FWI) is the cutting‐edge seismic imaging technique used to reconstruct subsurface material properties such as wave velocities, mass density, and attenuation from measurements of reflected wavefields. In this article, we present the first implementation of FWI in the visco‐acoustic regime, based on a new time‐domain all‐
Christian Rheinbay, Andreas Rieder
wiley   +1 more source

Discrete Transforms and Orthogonal Polynomials of (Anti)symmetric Multivariate Sine Functions. [PDF]

Entropy (Basel), 2018
Brus A, Hrivnák J, Motlochová L.
europepmc   +1 more source

Self‐Correction of B0 Drift and Trajectory Error in Alternating Unbalanced SSFP‐FID and SSFP‐ECHO (AUSFIDE)‐Based 3D Transverse Relaxometry of the Human Brain

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose The alternating unbalanced SSFP (AUSFIDE) pulse sequence, which consists of multi‐echo trains of SSFP‐FID and SSFP‐ECHO modules, enables rapid estimation of R2 and R2′, but is prone to errors from temporal drift of the main magnetic field (B0) and k‐space trajectory mismatch.
Eunseo Bae, Sung Suk Oh, Dongyeob Han, Kathryn M. Jaroszynski, Felix W. Wehrli, Hyunyeol Lee   +5 more
wiley   +1 more source

Boundary characteristic orthogonal polynomials method in the vibration analysis of multi-span plates acting upon a moving mass. [PDF]

Heliyon, 2019
Kashani Rad H, Ghalehnovi M, Shariatmadar H.   +2 more
europepmc   +1 more source

RVE‐Based Mechanical Modeling of Woven CFRPs With Nonorthogonal Yarn Angles via Micro‐CT Scan and Deep Learning

Polymer Composites, EarlyView.
The overview of the CT‐based RVE reconstruction and FEA simulation processes of CFRPs. ABSTRACT This work mainly explores the effectiveness of using deep‐learning‐based reconstruction methods from CT scan images to directly establish the representative volume element (RVE) of woven composite materials with nonorthogonal yarn angles for high‐fidelity ...
Chongrui Tang, Deyong Sun, Ting Fai Kong, Meiyu Liu, Weizhao Zhang   +4 more
wiley   +1 more source

Numerical analysis, spectral graph theory, orthogonal polynomials and quantum algorithms. [PDF]

Philos Trans A Math Phys Eng Sci
Minenkova A, Mograby G, Zhan H.
europepmc   +1 more source

Recurrence relations for orthogonal polynomials for PDEs in polar and cylindrical geometries. [PDF]

Springerplus, 2016
Richardson M, Lambers JV.
europepmc   +1 more source

Spectral Submanifolds of Delay Systems: Control in Continuous and Discrete Time

International Journal of Robust and Nonlinear Control, EarlyView.
ABSTRACT This paper presents both continuous‐time and discretization‐based approaches for constructing spectral submanifolds (SSMs) for time delay systems. The continuous‐time approach built upon sun–star calculus, reformulates the governing delay differential equation (DDE) as an operator differential equation (OpDE).
Bence Szaksz, Gábor Orosz, Gábor Stépán   +2 more
wiley   +1 more source

Constrained numerical deconvolution using orthogonal polynomials. [PDF]

Heliyon
Maestre JM, Chanfreut P, Aarons L.
europepmc   +1 more source