Results 141 to 150 of about 6,521,824 (285)

Note on traces of matrix products involving inverses of positive definite ones

Journal of Applied Mathematics and Computational Mechanics, 2018
Andrzej Z. Grzybowski
doaj   +1 more source

The Requirement of a Positive Definite Covariance Matrix of Security Returns for Mean-Variance Portfolio Analysis: A Pedagogic Illustration

Spreadsheets in Education, 2010
This study considers, from a pedagogic perspective, a crucial requirement for the covariance matrix of security returns in mean-variance portfolio analysis.
Clarence C. Y. Kwan
doaj  

Italian International Trauma Questionnaire for Children and Adolescents: Factor structure, measurement invariance, and validity in community and high‐risk samples

Journal of Traumatic Stress, EarlyView.
Abstract Complex posttraumatic stress disorder (CPTSD) is recognized as a distinct diagnosis in the ICD‐11. The International Trauma Questionnaire for Children and Adolescents (ITQ‐CA) assesses CPTSD symptoms in youth aged 7–17 years; however, no validated Italian version is currently available.
Marvita Goffredo, Alessandro Costantini, Gabrielle Coppola, Pasquale Musso, Michele Simeone, Jonathan I Bisson, Marylene Cloitre, Francesco Mancini, Maria Grazia Foschino Barbaro   +8 more
wiley   +1 more source

Stochastic threshold dynamics of an HIV model with latent cell activation under mean-reverting environmental noise. [PDF]

Infect Dis Model
Cao Z, Jiang Y, Shi Z, Jiang D, Wei S, Zhou Y.   +5 more
europepmc   +1 more source

Spatial Patterns, Driving Forces, and Potential Grain Losses of Non‐Grain Production of Farmland in Central Yunnan Urban Agglomeration, China

Land Degradation &Development, EarlyView.
ABSTRACT The expansion of farmland non‐grain production (NGP) poses a potential threat to food security and agricultural land protection, particularly in mountainous urban agglomerations. However, the utilization patterns, driving mechanisms, and associated production‐loss effects of farmland NGP in this specific regional context remain insufficiently ...
Xiaoliang Ma, Chun Li, Shanshan Chen, Yiting Wang, Zhiqiang Lin, Liding Chen   +5 more
wiley   +1 more source

Distributed Kalman Filter with Maximum Correlation Entropy Criterion and Consensus Weighted Term Fusion. [PDF]

Entropy (Basel)
Feng X, Gao Z, Liu T.
europepmc   +1 more source

Quantization of Polaritons Confined in Dielectric Structures

Laser &Photonics Reviews, EarlyView.
This study addresses the limitations of the Hopfield model of strong light‐matter coupling in the case of structured dieletrics. A method to derive quantum models in the polariton basis using Bogoliubov transformation and third quantization is introduced, demonstrating how to boost interaction strength and engineer nonlocal interactions for strongly ...
Amir Rahmani, Dogyun Ko, Maciej Dems, Andrzej Opala, Michał Matuszewski   +4 more
wiley   +1 more source

Frequency-filtered attention for cross-species fMRI time series prediction under small-sample learning. [PDF]

iScience
Du C, Zhao F, Sun Y, Yue Z, Wu R, Wang J, Zhang Q, Zeng Y.   +7 more
europepmc   +1 more source

Theory of Supercritical Coupling and Generalized Bound States in the Continuum

Laser &Photonics Reviews, EarlyView.
We develop a general theory of supercritical coupling and generalized bound states in the continuum (gBICs), revealing how interference between radiative and absorptive channels enables quality factors beyond conventional material‐loss limits. The framework unifies non‐Hermitian mode coupling, causality‐driven reactive interactions, and interference ...
Sergio Balestrieri, Bruno Miranda, Silvia Romano, Gianluigi Zito   +3 more
wiley   +1 more source

Adaptive Event-Triggered Distributed Estimation for a Class of Non-Linear Systems over Sensor Networks with Replay Attacks: The Finite-Horizon Case. [PDF]

Entropy (Basel)
Bu X, Lu T, Dong W, Li J, Hou N.
europepmc   +1 more source