Results 81 to 90 of about 5,309,525 (360)
Angewandte Chemie, EarlyView.Equidistant stacking of radicals is typically unstable due to symmetry‐lowering distortions. We predict that such arrangements can be stabilized by multicentered covalent (“pancake”) bonding and Coulombic repulsion between negatively charged radicals.
Alvaro Lobato +2 more
wiley +2 more sources
Saddle point duality theorems for Pareto optimization
Journal of Numerical Analysis and Approximation Theory, 1986 Not available.
Paul Iacob
doaj +2 more sources
The Antitriangular Factorization of Saddle Point Matrices [PDF]
SIAM Journal on Matrix Analysis and Applications, 2014 Mastronardi and Van Dooren [SIAM J. Matrix Anal. Appl., 34 (2013), pp. 173--196] recently introduced the block antitriangular (``Batman'') decomposition for symmetric indefinite matrices. Here we show the simplification of this factorization for saddle point matrices and demonstrate how it represents the common nullspace method.
Pestana, Jennifer, Wathen, Andrew
openaire +4 more sources
Random Matrix Theory by the Supersymmetry Method Beyond the Sigma-Model
, 1997 The leading correction to the smoothed connected energy density-density correlation function is obtained for the large energy difference, within the context of the Gaussian Random Matrix Theory.
Ambjørn +58 more
core +1 more source
Impact of System‐Model Mismatch in Fourier Ptychographic Microscopy
Advanced Photonics Research, EarlyView.This study investigates the robustness of Fourier ptychography microscope (FPM) reconstruction algorithms across various scenarios, each representing challenges encountered in practical FPM experiments, and deduces the extent to which FPM can provide diffraction‐limited resolution under the influence of various sources of error.
Tuo Yin +4 more
wiley +1 more source
N‐Doped Nonalternant Molecular Bowl/Saddle Hybrids
Angewandte Chemie, EarlyView.N‐Doped molecular bowl/saddle hybrids were developed via core‐expansion synthetic strategy. Owing to the structural features containing both positive and negative curvatures, these molecules exhibit unique molecular dynamics, photophysical properties and multiple guest bindings. Abstract Herein, we report the straightforward synthesis and properties of
Shuhai Qiu +10 more
wiley +2 more sources
The alternate direction iterative methods for generalized saddle point systems
Journal of Inequalities and Applications, 2019 The paper studies two splitting forms of generalized saddle point matrix to derive two alternate direction iterative schemes for generalized saddle point systems.
Shuanghua Luo +2 more
doaj +1 more source
Journal of Mathematics, 2021 The preconditioned generalized shift-splitting (PGSS) iteration method is unconditionally convergent for solving saddle point problems with nonsymmetric coefficient matrices.
Yao Xiao, Qingbiao Wu, Yuanyuan Zhang
doaj +1 more source
Analysis of Preconditioners for Saddle-Point Problems [PDF]
SIAM Journal on Scientific Computing, 2004 The authors describe a preconditioning technique for ``saddle-point'' structure matrices arising from mixed finite element formulations. The construction of preconditioners is based on some more general spectral eqivalence-like assumptions (norm and field-of-values equivalences), for problems satisfying Babuška's stability conditions.
Loghin, D, Wathen, A
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A Mild and Efficient Iridium‐Catalyzed Method for Aldimine Hydrogenation
Advanced Synthesis &Catalysis, EarlyView.A mild, efficient, and broadly applicable iridium‐catalyzed method for aldimine hydrogenation, facilitating access to an array of corresponding amine products in high isolated yields is reported. The developed methodology employs a bidentate iridium‐N‐heterocyclic carbene‐phosphine complex for use at low catalyst loadings, and proceeds under an ...
Aidan McKeown +4 more
wiley +1 more source