Results 61 to 70 of about 5,309,525 (360)

Saddle point states and energy barriers for vortex entrance and exit in superconducting disks and rings

, 2000
The transitions between the different vortex states of thin mesoscopic superconducting disks and rings are studied using the non-linear Ginzburg-Landau functional.
Baelus, B. J., Peeters, F. M., Schweigert, V. A.   +2 more
core   +1 more source

Covalent Organic Frameworks for Photocatalysis

Advanced Materials, EarlyView.
This review provides an overview of recent advances in covalent organic frameworks (COFs) for photocatalysis, focusing on sustainable energy applications like water splitting, hydrogen peroxide generation, and CO2 and N2 reduction. It discusses design principles, structure‐function relationships, challenges in COF photocatalysis, and strategies to ...
Bikash Mishra, Akhtar Alam, Avanti Chakraborty, Bidhan Kumbhakar, Samrat Ghosh, Pradip Pachfule, Arne Thomas   +6 more
wiley   +1 more source

Kuramoto Phase Model with Inertia: Bifurcations Leading to the Loss of Synchrony and to the Emergence of Chaos

Моделирование и анализ информационных систем, 2015
We consider a finite-dimensional model of phase oscillators with inertia in the case of star configuration of coupling. The system of equations is reduced to a nonlinearly coupled system of pendulum equations.
V. N. Belykh, M. I. Bolotov, G. V. Osipov   +2 more
doaj   +1 more source

Saddle point least squares for the reaction–diffusion problem

Results in Applied Mathematics, 2020
We consider a mixed variational formulation for the reaction–diffusion problem based on a saddle point least square approach with an optimal test norm and nonconforming trial spaces.
Constantin Bacuta, Jacob Jacavage
doaj   +1 more source

Structurally unstable quadratic vector fields of codimension two: families possessing a finite saddle-node and an infinite saddle-node

Electronic Journal of Qualitative Theory of Differential Equations, 2021
In 1998, Artés, Kooij and Llibre proved that there exist 44 structurally stable topologically distinct phase portraits modulo limit cycles, and in 2018 Artés, Llibre and Rezende showed the existence of at least 204 (at most 211) structurally unstable ...
Joan Artés, Marcos Mota, Alex Rezende
doaj   +1 more source

FeNb2O6 as a High‐Performance Anode for Sodium‐Ion Batteries Enabled by Structural Amorphization Coupled with NbO6 Local Ordering

Advanced Materials, EarlyView.
FeNb2O6 is applied for the first time as a high‐performance anode material for sodium‐ion batteries. The presence of iron disrupts the long‐range order by local disorder of the FeO6 octahedra during initial sodiation. Simultaneously, the formation of short‐range ordered zigzag‐chain structures within the NbO6 planes establishes a robust intercalation ...
Yanchen Liu, Ana Guilherme Buzanich, Paola Alippi, Luciano A. Montoro, Kug‐Seung Lee, Taeyeol Jeon, Kilian Weißer, Martin A. Karlsen, Patrícia A. Russo, Nicola Pinna   +9 more
wiley   +1 more source

Numerical saddle point method

Journal of Mathematical Analysis and Applications, 1972
AbstractAn asymptotic expansion of integrals containing an exponential integrand with a large parameter can be obtained by the well-known saddle point method. For integrands further containing Hankel functions a numerical double saddle point method is described herein, allowing the numerical computation of these integrals without using an asymptotic ...
openaire   +3 more sources

Néel Tensor Torque in Polycrystalline Antiferromagnets

Advanced Materials, EarlyView.
This work introduces a Néel tensor torque based on a rank‐two symmetric tensor capturing spin correlations in a polycrystalline antiferromagnet. It shows the Néel tensor can be shaped and reshaped through the spin‐orbit torque (SOT) technique, enabling field‐free SOT switching with a specific polarity of the adjacent ferromagnet. This discovery opens a
Chao‐Yao Yang, Sheng‐Huai Chen, Chih‐Hsiang Tseng, Hsiu‐Hau Lin, Chih‐Huang Lai   +4 more
wiley   +1 more source

Convergence of Some Iterative Methods for Symmetric Saddle Point Linear Systems

SIAM Journal on Matrix Analysis and Applications, 2019
We consider the iterative solution of linear systems with a symmetric saddle point system matrix.
Y. Notay
semanticscholar   +1 more source

A generalized saddle point theorem

Journal of Differential Equations, 1989
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
openaire   +2 more sources