Results 41 to 50 of about 1,476 (274)

Star-Convexity of the Eigenvalue Regions for Stochastic Matrices and Certain Subclasses

Mathematics
Star-convexity of the eigenvalue region for the set of n×n stochastic matrices has already been proven, for n≥2, by Dmitriev and Dynkin. The star-convexity property enables full determination of the eigenvalue region by its boundary.
Brando Vagenende, Brecht Verbeken, Marie-Anne Guerry   +2 more
doaj   +1 more source

On the Inverse Eigenvalue Problem for Irreducible Doubly Stochastic Matrices of Small Orders

Abstract and Applied Analysis, 2014
The inverse eigenvalue problem is a classical and difficult problem in matrix theory. In the case of real spectrum, we first present some sufficient conditions of a real r-tuple (for r=2; 3; 4; 5) to be realized by a symmetric stochastic matrix.
Quanbing Zhang, Changqing Xu, Shangjun Yang   +2 more
doaj   +1 more source

Politopo de Birkhoff acíclico [PDF]

, 2011
Doutoramento em MatemáticaNeste trabalho estabelece-se uma interpreta c~ao geom etrica, em termos da teoria dos grafos, para v ertices, arestas e faces de uma qualquer dimens~ao do politopo de Birkho ac clico, Tn = n(T), onde T e uma arvore com ...
Costa, Liliana Manuela Gaspar Cerveira da
core   +1 more source

Organic Materials of Tomorrow: Horizons of Artificial Intelligence

Advanced Materials, EarlyView.
This review examines machine learning techniques accelerating the discovery of organic semiconductors by linking molecular structure to properties. Key methods include graph neural networks, generative models, and active learning. Applications to organic photovoltaics demonstrate practical impact.
Harold Mena, J. Terence Blaskovits, Kun‐Han Lin, Denis Andrienko   +3 more
wiley   +1 more source

Doubly stochastic matrices whose powers eventually stop [PDF]

, 2001
In this note we characterize doubly stochastic matrices A whose powers A,A2,A3,… eventually stop, i.e., Ap=Ap+1=⋯ for some positive integer p.
Sung-Soo Pyo, Suk-Geun Hwang, Pyo, Sung-Soo, Hwang, Suk-Geun   +3 more
core   +1 more source

Reprogramming the Immunosuppressive Microenvironment in Triple‐Negative Breast Cancer via FAP‐Targeted Nanoprobes for Multimodal Imaging and Photothermal Therapy

Advanced Materials, EarlyView.
Targeting cancer‐associated fibroblasts (CAFs) with fibroblast activation protein (FAP)‐directed nanoprobes for multimodal imaging and photothermal remodeling of the immunosuppressive microenvironment to enhance immunotherapy in triple‐negative breast cancer (TNBC).
Ling Zhan, Yanhong Chen, Jingjing Hu, Chunting Wang, Huanhuan Liu, Defan Yao, Dengbin Wang   +6 more
wiley   +1 more source

The theory and applications of complex matrix scalings

Special Matrices, 2014
We generalize the theory of positive diagonal scalings of real positive definite matrices to complex diagonal scalings of complex positive definite matrices.
Pereira Rajesh, Boneng Joanna
doaj   +1 more source

Dynamic Mechanical Loading Modulates Extracellular Vesicle Production and Cargo in Meniscus Fibrochondrocytes

Advanced Materials Interfaces, EarlyView.
Dynamic mechanical loading of outer meniscus fibrochondrocytes increases extracellular vesicle (EV) yield and alters EV composition. When applied to progenitor cells, these mechanically primed EVs modulate the expression of matrix‐related genes.
Catherine Cheung, Zizhao Li, Sung‐Han Jo, Se‐Hwan Lee, Il Keun Kwon, Jina Ko, Su Chin Heo   +6 more
wiley   +1 more source

Stability Conditions in Multiple-Input Multiple-Output Systems

Axioms
This paper investigates the stabilization of unstable third-order Multiple-Input Multiple-Output (MIMO) systems whose interaction structure is described by a doubly stochastic combined matrix, also known as the Relative Gain Array (RGA).
Macarena Boix, Begoña Cantó
doaj   +1 more source

Optimal Approximation of Doubly Stochastic Matrices

CoRR, 2019
We consider the least-squares approximation of a matrix C in the set of doubly stochastic matrices with the same sparsity pattern as C. Our approach is based on applying the well-known Alternating Direction Method of Multipliers (ADMM) to a reformulation of the original problem.
Nikitas Rontsis, Paul Goulart
openaire   +3 more sources