Results 51 to 60 of about 408,199 (314)
International Journal of Adaptive Control and Signal Processing, EarlyView.This paper proposes two projector‐based Hopfield neural network (HNN) estimators for online, constrained parameter estimation under time‐varying data, additive disturbances, and slowly drifting physical parameters. The first is a constraint‐aware HNN that enforces linear equalities and inequalities (via slack neurons) and continuously tracks the ...
Miguel Pedro Silva
wiley +1 more source
Almost-Hermitian Random Matrices: Crossover from Wigner-Dyson to Ginibre eigenvalue statistics
, 1997 By using the method of orthogonal polynomials we analyze the statistical properties of complex eigenvalues of random matrices describing a crossover from Hermitian matrices characterized by the Wigner- Dyson statistics of real eigenvalues to strongly non-
A. Edelman +31 more
core +1 more source
Complex Eigenvalues and Trend-Reverting Fluctuations
, 1998 Autoregressions of quarterly or annual aggregate time series provide evidence of trend-reverting output growth and of short-term dynamic adjustment that appears to be governed by complex eigenvalues. This finding is at odds with the predictions of reasonably parameterized, convex one-sector growth models, most of which have positive real characteristic
Costas Azariadis +2 more
openaire +3 more sources
Variational Principles for Complex Eigenvalues
The Astrophysical Journal, 1979 The onset of instabilities occurring in a variety of physical systems, including plasmas and galaxies, is often studied by carrying out a harmonic analysis of linearized equations of motion. A variational principle is described for the complex normal mode frequencies found in a wide class of problems.
C. E. Detar, F. E. Low
openaire +1 more source
Advanced Engineering Materials, EarlyView.This article presents a solver‐agnostic domain‐specific language (DSL) for computational structural mechanics that strengthens interoperability in virtual product development. Using a hierarchical data model, the DSL enables seamless exchange between diverse simulation tools and numerical methods.
Martin Rädel +3 more
wiley +1 more source
THE PROCESS OF HEAT TRANSFER IN TWO-LAYERED CYLINDRICAL BODY
Известия высших учебных заведений: Проблемы энергетики, 2019 Determination of thermal regimes of composite cylindrical bodies by analytical methods leads to the appearance of complex characteristic equations, the solution of which is the determination of eigenvalues.
U. V. Vidin, R. V. Kazakov, V. S. Zlobin
doaj +1 more source
Real eigenvalues in the non-Hermitian Anderson model
, 2018 The eigenvalues of the Hatano--Nelson non-Hermitian Anderson matrices, in the spectral regions in which the Lyapunov exponent exceeds the non-Hermiticity parameter, are shown to be real and exponentially close to the Hermitian eigenvalues.
Goldsheid, Ilya, Sodin, Sasha
core +1 more source
Eigenvalue density of correlated complex random Wishart matrices [PDF]
Physical Review E, 2004 Using a character expansion method, we calculate exactly the eigenvalue density of random matrices of the form M^\dagger M where M is a complex matrix drawn from a normalized distribution P(M) ~ exp(-\Tr(A M B M^\dagger) with A and B positive definite (square) matrices of arbitrary dimensions.
Simon, S, Moustakas, A
openaire +3 more sources
Advanced Functional Materials, EarlyView.This study uncovers the unexplored role of intermolecular interactions in multiphoton absorption in coordination polymers. By analyzing [Zn2tpda(DMA)2(DMF)0.3], it shows how the electronic coupling of the chromophores and confinement in the MOF enhance two‐and three‐photon absorption.
Simon Nicolas Deger +11 more
wiley +1 more source
Pseudo-Hermiticity for a Class of Nondiagonalizable Hamiltonians
, 2002 We give two characterization theorems for pseudo-Hermitian (possibly nondiagonalizable) Hamiltonians with a discrete spectrum that admit a block-diagonalization with finite-dimensional diagonal blocks.
Ali Mostafazadeh +2 more
core +1 more source