Results 91 to 100 of about 9,546 (165)

Entrywise transforms preserving matrix positivity and nonpositivity

open access: yesJournal of the London Mathematical Society, Volume 113, Issue 5, May 2026.
Abstract We characterize real and complex functions which, when applied entrywise to square matrices, yield a positive definite matrix if and only if the original matrix is positive definite. We refer to these transformations as sign preservers. Compared to the classical work on entrywise preservers by Schoenberg and others, we completely resolve this ...
Dominique Guillot   +3 more
wiley   +1 more source

Does Aromaticity Drive Metal Cation Binding to Nanographenes? Insights Into Regioselectivity and Cation‐π$$ \pi $$ Bonding

open access: yesJournal of Computational Chemistry, Volume 47, Issue 10, 15 April 2026.
Aromaticity of a ring by itself does not explain the binding energies of alkali and alkaline earth metal cations with nanographenes, but when combined with the Fukui function, it does. ABSTRACT Nanographenes, a subclass of polycyclic aromatic hydrocarbons (PAHs), have attracted significant interest due to their unique electronic properties and broad ...
Omkar Charapale   +3 more
wiley   +1 more source

Robust Inverse Material Design With Physical Guarantees Using the Voigt‐Reuss Net

open access: yesInternational Journal for Numerical Methods in Engineering, Volume 127, Issue 7, 15 April 2026.
ABSTRACT We apply the Voigt‐Reuss net, a spectrally normalized neural surrogate introduced in [38], for forward and inverse mechanical homogenization with a key guarantee that all predicted effective stiffness tensors satisfy Voigt‐Reuss bounds in the Löwner sense during training, inference, and gradient‐driven optimization.
Sanath Keshav, Felix Fritzen
wiley   +1 more source

Hotspots for mutations in the SARS-CoV-2 spike glycoprotein: a correspondence analysis. [PDF]

open access: yesSci Rep, 2021
Rahbar MR   +10 more
europepmc   +1 more source

Work, marriage and premature birth: the socio-medicalisation of pregnancy in state socialist East-Central Europe. [PDF]

open access: yesMed Hist, 2023
Lišková K   +4 more
europepmc   +1 more source

Human-Computer Interaction for Recognizing Speech Emotions Using Multilayer Perceptron Classifier. [PDF]

open access: yesJ Healthc Eng, 2022
Alnuaim AA   +7 more
europepmc   +1 more source

Home - About - Disclaimer - Privacy