Results 41 to 50 of about 163,993 (328)
Hybrid V-Cycle Algebraic Multilevel Preconditioners [PDF]
Mathematics of Computation, 1992 The paper describes a new algebraically defined multilevel preconditioner for the finite element matrix arising from the discretization of a second-order selfadjoint elliptic boundary value problem. The construction of the preconditioner is based on a sequence of grids (levels) given by successive refinement and the corresponding hierarchical two-by ...
openaire +1 more source
Quadratic systems with a symmetrical solution
Electronic Journal of Qualitative Theory of Differential Equations, 2018 In this paper we study the existence and uniqueness of limit cycles for so-called quadratic systems with a symmetrical solution: \begin{equation*} \begin{split} \frac{dx(t)}{dt}& = P_2(x,y) \equiv a_{00}+a_{10}x+a_{01}y+a_{20}x^2+a_{11}xy+a_{02}y^2 ...
Andre Zegeling, Robert Kooij
doaj +1 more source
Backbone Heterojunction Photocatalysts for Efficient Sacrificial Hydrogen Production
Advanced Functional Materials, EarlyView.Herein, a ‘single‐component’ organic semiconductor photocatalyst is presented in which a molecular donor is bonded to a polymer acceptor. The resultant material demonstrates exceptional photocatalytic activity for hydrogen evolution in aqueous triethylamine with an outstanding external quantum efficiency of 38% at 420 nm.
Richard J. Lyons +11 more
wiley +1 more source
Algebraic construction of a coboundary of a given cycle [PDF]
Opuscula Mathematica, 2007 We present an algebraic construction of the coboundary of a given cycle as a simpler alternative to the geometric one introduced in [M. Allili, T. Kaczyński, Geometric construction of a coboundary of a cycle, Discrete Comput. Geom. 25 (2001), 125–140, T.
Marcin Mazur, Jacek Szybowski
doaj
Algebraic cycles and algebraic K-theory
Journal of Algebra, 1979 ‘l’he purpose of this paper is to develop higher algebraic K-theory into a tool for understanding algebraic cycles on a variety. Bloch made the first step: he showed that the group of zero-cycles modulo rational equivalence is Ha(X, L%$) on a nonsingular surface X. Gersten reduced the general statement that H”(X, .%‘J is A”(X), the group of codimension
openaire +1 more source
Algebras with cycle-finite Galois coverings [PDF]
Transactions of the American Mathematical Society, 2011 It is proved that every finite-dimensional algebra over an algebraically closed field which admits a cycle-finite Galois covering with torsion-free Galois group is tame, and a description of the indecomposable finite-dimensional modules over these algebras is given.
de la Peña, José A. +1 more
openaire +2 more sources
Observation of Topological Chirality Switching Induced Freezing of a Skyrmion Crystal
Advanced Materials, EarlyView.Using Lorentz Transmission electron microscopy, it is shown that in the insulating van der Waals ferromagnet, CrBr3, a magnetic field can cause Bloch skyrmionic bubbles to spontaneously switch their chirality. As achiral type‐II bubbles are an intermediate state, the bubbles rapidly elongate and shrink when switching, thereby inducing a freezing of the
John Fullerton +10 more
wiley +1 more source
An ant colony genetic fusion routing algorithm based on soft define network
IET Networks, EarlyView., 2022 Abstract Aiming at the problem that there are many paths in data forwarding in soft define network (SDN) network, and the optimal path is difficult to find, combined with the advantages of ant colony algorithm and Genetic algorithm (GA), a routing control strategy based on the ant colony genetic fusion algorithm is proposed.
Kaixin Zhao, Yong Wei, Yang Zhang
wiley +1 more source
Lower bounds for the algebraic connectivity of graphs with specified subgraphs
Electronic Journal of Graph Theory and Applications, 2021 The second smallest eigenvalue of the Laplacian matrix of a graph G is called the algebraic connectivity and denoted by a(G). We prove thata(G)>π2/3(p(12g(n1, n2, …, np)2 − π2)/4g(n1, n2, …, np)4 + 4(q − p)(3g(np + 1, np + 2, …, nq)2 − π2)/g(np + 1 ...
Zoran Stanic
doaj +1 more source
Advanced Materials, EarlyView.Holographic microlithography enables the fabrication of fully connected 3D liquid crystalline structures in a single exposure. The process maintains precise control over the director orientation within the entire object, preventing local director distortions typically observed in sequential printing.
Lovish Gulati +8 more
wiley +1 more source