Results 71 to 80 of about 351,014 (282)
Existence of solutions for Kirchhoff-type problems via the method of lower and upper solutions
Electronic Journal of Differential Equations, 2019 This article considers elliptic problems of Kirchhoff-type. We give some new definitions of lower and upper solutions for the problem and establish the method of lower and upper solutions when the upper and lower solutions are well ordered, i.e., the ...
Baoqiang Yan +2 more
doaj
Smith-Knight/Rayleigh-Knight Essay [PDF]
, 2009 On a complex variety X, two different approaches to K-theory are available: the algebraic K-theory of the variety, and the topological K-theory of the underlying topological space.
Zibrowius, Marcus
core
Degree based topological indices of polysiloxanes
, 2021 Summary: Molecules can be modelled by graphs to obtain their required properties by means of only mathematical methods and formulae. In this paper, we consider several degree based topological graph indices of a chemical molecule called polysiloxanes.
Demirci, Musa +3 more
openaire +3 more sources
Domain Wall Rebounds Driven by Competing Entropic and Spin‐Transfer Torques in Cylindrical Nanowires
Advanced Functional Materials, EarlyView.Domain‐wall motion in cylindrical magnetic nanowires driven by nanosecond current pulses. Low current densities efficiently displace domain walls, whereas higher currents cause rebound at the wire ends. The effect results from the interplay between spin‐transfer torque and thermally induced processes, highlighting the role of thermal gradients in ...
Elias Saugar +11 more
wiley +1 more source
Topological degree and Sperner's lemma [PDF]
Fundamenta Mathematicae, 1983 The author introduces a topological degree mod 2 for a certain class of continuous maps from an n-dimensional finite polyhedron \(\Pi^ n\) into \({\mathbb{R}}^{n+1}\backslash\{0\}\). In case \(\Pi^ n\) is an n-simplex the degree is based on a strong version of Sperner's lemma.
openaire +2 more sources
Stacking‐Engineered Magnonic Topology and Transport in Honeycomb Homobilayers
Advanced Functional Materials, EarlyView.ABSTRACT Topological magnons have emerged as a promising platform for dissipationless bosonic transport. However, a straightforward and effective strategy to engineer such topological states in real materials has yet to be fully realized. Here, a general scheme for controlling magnonic topological states via stacking engineering in van der Waals ...
Xiaoran Feng +6 more
wiley +1 more source
Extremal Topological Indices with Prescribed Degree Sequences
Vestnik KRAUNC: Fiziko-Matematičeskie NaukiThis paper explores the extremal properties and bounds of two significant topological indices in graph theory: the Albertson and Sigma indices, with an emphasis on trees and bipartite graphs.
Hamoud, J., Belov, A.Ya.
doaj +1 more source
Advanced Functional Materials, EarlyView.Covalent organic frameworks (COFs) with metals have been recognized as versatile platforms for photocatalytic CO2 reduction (CO2PRR). Herein, an overview of metal integration strategies for COFs is systematically summarized. Regulatory mechanisms and structure–activity relationships between metal integration and COF‐based CO2PRR are emphasized.
Jie He +5 more
wiley +1 more source
On Molecular Descriptors of Carbon Nanocones
Biomolecules, 2018 Many degree-based topological indices can be obtained from the closed-off M-polynomial of a carbon nanocone. These topological indices are numerical parameters that are associated with a structure and, in combination, determine the properties of the ...
Waqas Nazeer +4 more
doaj +1 more source
Mathematics, 2020 In this paper, we study the existence of nontrivial solutions for a system of fractional q-difference equations involving q-integral boundary conditions, and we use the topological degree to establish our main results by considering the first eigenvalue ...
Yaohong Li +3 more
doaj +1 more source