Results 71 to 80 of about 1,476 (274)
On diagonal products of doubly stochastic matrices [PDF]
, 1980 The following result is proved: If A and B are distinct n × n doubly stochastic matrices, then there exists a permutation σ of {1, 2,…, n} such that ∏iaiσ(i) > ∏ib iσ(i)
Raghavan, T.E.S., Bapat, R.
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Advanced Science, EarlyView.High‐throughput quantum‐mechanical simulations reveal that amorphous carbon undergoes shear‐driven structural transformation into aromatic, graphene‐like interfaces. This mechanochemical process is governed by dopant chemistry: dopants with valency less than four promote the emergence of superlow‐friction amorphous graphene, whereas tetra‐valent ...
Takuya Kuwahara +4 more
wiley +1 more source
Flexoelectricity in Photoconversion: Fundamentals, Materials, and Outlooks
Advanced Science, EarlyView.Mechanical bending of a flexible cantilever induces a strain gradient in the photoactive material. The resulting flexoelectric field couples with photovoltaic and photoconductive effects, modulating charge generation, separation, and collection. A comparative analysis of oxide perovskites, halide perovskites, and two‐dimensional materials is presented,
Xiang Huang, Feng Li, Rongkun Zheng
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The diameter of the Birkhoff polytope
Special MatricesThe geometry of the compact convex set of all n×nn\times n doubly stochastic matrices, a structure frequently referred to as the Birkhoff polytope, has been an active subject of research as of late.
Bouthat Ludovick +2 more
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A note on symmetric doubly-stochastic matrices
Discrete Mathematics, 1975 AbstractEach extreme point in the convex set Δ∗n of all n×n symmetric doubly-stochastic matrices is shown to have the form 12(P + Pt), for some n×n permutation matrix P. The convex hull Σn of the integral points in Δ∗n (i.e., the symmetric permutation matrices) is shown to consist of those matrices, X = (xij) in Δ∗n satisfying Σi∈SΣj∈S−{i} xij ⩽ 2k ...
openaire +2 more sources
The relation between extreme doubly stochastic operators and extreme doubly stochastic matrices. [PDF]
, 2012 Doubly stochastic quadratic operators are put into correspondence with doubly stochastic matrices. It is shown that the operator is extreme only if the corresponding matrix is extreme.
Shahidi, Farruh
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Advanced Science, EarlyView.Expanded‐graphite/graphene‐nanoplatelet hybrids deliver a near‐order‐of‐magnitude thermal‐conductivity enhancement in paraffin phase‐change materials. A microCT‐informed 3D modeling framework resolves the percolating EG backbone and captures sub‐voxel GNP enrichment, quantitatively linking microstructure to heat flow and revealing a graphene‐enabled ...
Thomas Hoke +4 more
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G-decompositions of matrices and quadratic doubly stochastic operators [PDF]
, 2011 G.D Birkhoff characterized the set of extreme doubly stochastic matrices. Namely his result states as follows: the set of extreme points of the set of doubly stochastic matrices coincides with the set of all permutations matrices.
Mukhamedov, Farrukh +2 more
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Notes on the Birkhoff Algorithm for Doubly Stochastic Matrices [PDF]
, 1982 The purpose of this note is to tie together some results concerning doubly stochastic matrices and their representations as convex combinations of permutation matrices.
Richard A. Brualdi
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Advanced Science, EarlyView.PhosSight is a unified deep‐learning framework for phosphoproteome identification, featured by a phosphorylation‐aware detectability predictor. It improves identification sensitivity in DDA through deep re‐localization and rescoring, accelerates DIA searches by detectability‐guided spectral library pruning, and expands phosphoproteome coverage to ...
Ben Wang +10 more
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