Results 81 to 90 of about 143,594 (316)

Rational design of Ni‐based catalysts for methane dry reforming: Recent advances and future perspectives

FlexMat, EarlyView.
Addressing the challenges inherent in dry reforming of methane (DRM), this paper focuses on the structural design and performance optimization of Ni‐based catalysts. The modulation strategies for DRM are systematically reviewed across four dimensions: the micromorphology of active metals, metal‐support interactions, electronic modifications by ...
Bowei Cao, Junlei Zhang, Wanglei Wang
wiley   +1 more source

Commutative Chain Rings with Index of Nilpotency 5 and Residue Field ${\mathbb{F}}_{p^m}$

Axioms
This paper gives a thorough characterization of chain rings with index of nilpotency 5 and residue field Fpm, where p represents a prime number, contributing valuable insights to the field of algebraic structures.
Alhanouf Ali Alhomaidhi, Sami Alabiad, Nawal A. Alsarori   +2 more
doaj   +1 more source

Operator representation of weakly Cauchy sequences in projective tensor products of Banach spaces

International Journal of Mathematics and Mathematical Sciences, 1980
It is shown that the above sequences always determine linear transformations and if the sequences are bounded under the least cross norm, that the transformations are continuous.
J. M. Baker
doaj   +1 more source

R ( 5 , 5 ) ≤ 46 $R(5,5)\le 46$

Journal of Graph Theory, EarlyView.
ABSTRACT We prove that the Ramsey number R ( 5 , 5 ) $R(5,5)$ is less than or equal to 46. The proof uses a combination of linear programming and checking a large number of cases by computer. All of the computational parts of the proof were independently implemented by both authors, with consistent results.
Vigleik Angeltveit, Brendan D. McKay
wiley   +1 more source

Compact elliptic curve representations

Journal of Mathematical Cryptology, 2011
Let y2 = x3 + ax + b be an elliptic curve over 𝔽p, p being a prime number greater than 3, and consider a, b ∈ [1, p]. In this paper, we study elliptic curve isomorphisms, with a view towards reduction in the size of elliptic curves coefficients. We first
Ciet Mathieu, Quisquater Jean-Jacques, Sica Francesco   +2 more
doaj   +1 more source

Treewidth Versus Clique Number. V. Further Connections With Tree‐Independence Number

Journal of Graph Theory, EarlyView.
ABSTRACT We continue the study of ( tw , ω ) $({\mathsf{tw}},\omega )$‐bounded graph classes, that is, hereditary graph classes in which large treewidth is witnessed by the presence of a large clique, and the relation of this property to boundedness of the tree‐independence number, a graph parameter introduced independently by Yolov in 2018 and by ...
Claire Hilaire, Martin Milanič, Ðorđe Vasić   +2 more
wiley   +1 more source

Structure and Enumeration of Constacyclic Codes over Cube-Zero Local Rings of Order q⁵

Mathematics
We investigate λ-constacyclic codes of length n over finite commutative local rings R of characteristic p and order q5, where q=pm is an odd prime power, whose Jacobson radical N satisfies N3=0≠N2, under the coprimality condition gcd(n,p)=1.
Sami H. Saif, Shayea Aldossari
doaj   +1 more source

A note on zero-divisor graph of amalgamated duplication of a ring along an ideal

AKCE International Journal of Graphs and Combinatorics, 2017
Let be a commutative ring and be a non-zero ideal of . Let be the subring of consisting of the elements for and . In this paper we characterize all isomorphism classes of finite commutative rings with identity and ideal such that is planar.
A. Mallika, R. Kala
doaj   +1 more source

On isomorphism testing of a class of 2-Nilpotent groups

Journal of Computer and System Sciences, 1991
Let \(G\) be a group. A 3-tuple \((x_ 1,x_ 2,x_ 3)\) of elements of \(G\) satisfies \(P_ 3\) if there exists a nontrivial permutation \(\sigma\) of its components such that \(x_ 1x_ 2x_ 3=x_{\sigma(1)} x_{\sigma(2)} x_{\sigma(3)}\). \(G\) satisfies \(P_ 3\) if every 3-tuple of elements of \(G\) satisfies \(P_ 3\).
Max H. Garzon, Yechezkel Zalcstein
openaire   +2 more sources

Signed Projective Cubes, a Homomorphism Point of View

Journal of Graph Theory, EarlyView.
ABSTRACT The (signed) projective cubes, as a special class of graphs closely related to the hypercubes, are on the crossroad of geometry, algebra, discrete mathematics and linear algebra. Defined as Cayley graphs on binary groups, they represent basic linear dependencies.
Meirun Chen, Reza Naserasr, Alessandra Sarti   +2 more
wiley   +1 more source