Results 71 to 80 of about 16,710 (257)

Data‐Driven Discovery of Unconventional Antiferromagnets

Advanced Science, EarlyView.
A high‐throughput workflow that combines the physics‐informed pre‐screening, high‐throughput exchange calculations, Luttinger‐Tisza analysis and symmetry classification is established for accurate identification of unconventional antiferromagnets from the broad structural database.
Qirui Cui, Chenxu Liu, Anna Delin, Kaiyou Wang   +3 more
wiley   +1 more source

A Note on Positive Definite Matrices [PDF]

, 1971
4 pages, 1 article*A Note on Positive Definite Matrices* (Solomon, D.
Solomon, D. L., Cornell University. Dept. of Biological Statistics and Computational Biology., Cornell University. Biometrics Unit., Cornell University. Dept. of Biometrics.   +3 more
core  

On Projection of a Positive Definite Matrix on a Cone of Nonnegative Definite Toeplitz Matrices [PDF]

, 2018
We consider approximation of a given positive definite matrix by nonnegative definite banded Toeplitz matrices. We show that the projection on linear space of Toeplitz matrices does not always preserve nonnegative definiteness.
Filipiak, Katarzyna, Mieldzioc, Adam, Markiewicz, Augustyn, Sawikowska, Aneta   +3 more
core   +1 more source

Independence Characterization for Wishart and Kummer Random Matrices

Revstat Statistical Journal, 2020
We generalize the following univariate characterization of the Kummer and Gamma distributions to the cone of symmetric positive definite matrices: let X and Y be independent, non-degenerate random variables valued in (0,∞), then U = Y /(1 +X) and V = X ...
Bartosz Ko lodziejek , Agnieszka Piliszek   +1 more
doaj   +1 more source

Fundamental Challenges, Physical Implementations, and Integration Strategies for Ising Machines in Large‐Scale Optimization Tasks

Advanced Electronic Materials, EarlyView.
Ising machines are emerging as specialized hardware solvers for computationally hard optimization problems. This review examines five major platforms—digital CMOS, analog CMOS, emerging devices, coherent optics, and quantum systems—highlighting physics‐rooted advantages and shared bottlenecks in scalability and connectivity.
Hyunjun Lee, Joon Pyo Kim, Sanghyeon Kim
wiley   +1 more source

On Principal Minors of Positive Definite Matrices [PDF]

, 1981
3 pages, 1 article*On Principal Minors of Positive Definite Matrices* (Searle, S.
Searle, S. R., Cornell University. Dept. of Biological Statistics and Computational Biology., Cornell University. Biometrics Unit., Cornell University. Dept. of Biometrics.   +3 more
core  

A note on matrices with positive definite real part [PDF]

, 1981
A lemma characterizing complex matrices with positive definite real part is given. It is shown that many results concerning such matrices are straightforward consequences of this lemma.
David London
core   +1 more source

Partial Least Squares Regression on Symmetric Positive-Definite Matrices

Revista Colombiana de Estadística, 2013
Recientemente ha habido un aumento en el interés de analizar diferentes tipos de datos variedad-valuados, dentro de los cuáles aparecen los datos de matrices simétricas definidas positivas.
RAÚL ALBERTO PÉREZ, GRACIELA GONZÁLEZ-FARIAS   +1 more
doaj  

Necessary and Sufficient Conditions for the Existence of a Positive Definite Solution for the Matrix Equation

Journal of Applied Mathematics, 2013
In this paper necessary and sufficient conditions for the matrix equation to have a positive definite solution are derived, where , is an identity matrix, are nonsingular real matrices, and is an odd positive integer.
Naglaa M. El-Shazly
doaj   +1 more source

Do Politically Motivated Import Bans Leave Lasting Scars? Evidence From Australian–Chinese Beef Trade

Agribusiness, EarlyView.
ABSTRACT In May 2020, China abruptly suspended imports from several major Australian beef processors, escalating a diplomatic dispute between the two countries. This trade measure disrupted one of the largest beef export relationships in the world almost overnight.
K. Aleks Schaefer, Youngjune Kim
wiley   +1 more source