Results 81 to 90 of about 325 (259)

Matrix summability in 𝐹-fields [PDF]

Proceedings of the American Mathematical Society, 1957
when u,, = a,iu, for all n _0. If the sequence to sequence transformation associated with A is such that [u ' ] exists and converges whenever [un] converges we call A a K matrix. If [un' ] exists and converges to limn-ao un whenever this limit exists we call A a T matrix. Similar names for the series to sequence and the series to series matrices are K1,
openaire   +1 more source

Uniform Toeplitz matrices

International Journal of Mathematics and Mathematical Sciences, 1990
We characterize all infinite matrices of bounded linear operators on a Banach space which preserve the limits of uniformly convergent sequences defined on an infinite set.
I. J. Maddox
doaj   +1 more source

Combined Process‐ and Phase‐Field‐Simulation to Predict the Microstructure of Single‐Crystal Ni‐Based Superalloys

Advanced Engineering Materials, EarlyView.
A combined finite element and phase‐field approach predicts the evolution of microstructure during the directional solidification of Ni‐based superalloys. The model reveals how withdrawal rate, temperature gradient, and wall thickness control the dendrite spacing, highlighting the strong effect of surface regions in thin sections where dendrite growth ...
Sean Böhm, André B. Baldissera, Rainer Völkl, Uwe Glatzel   +3 more
wiley   +1 more source

Pointwise Approximation of Functions from 𝐿𝑝(𝑤)𝛽 by Linear Operators of Their Fourier Series

Journal of Function Spaces and Applications, 2012
We show the results, corresponding to theorem of Lal (2009), on the rate of pointwise approximation of functions from the pointwise integral Lipschitz classes by matrix summability means of their Fourier series as well as the theorems on norm ...
Włodzimierz Łenski, Bogdan Szal
doaj   +1 more source

Creating Ti–Fe α/β Alloys by Diffusion‐Driven Solid‐State Processing

Advanced Engineering Materials, EarlyView.
This study proposes making alloys containing fast diffusing elements that are difficult to produce by ingot metallurgy, by diffusion‐driven solid‐state HIP processing of elemental powders and low‐temperature homogenisation. Here, novel Fe‐Ti α–β alloys are formed having fine α–β lamellae, a small β prior grain size without significant intermetallics ...
Jiaqi Xu, Xun Zhang, Jack M. Donoghue, Albert D. Smith, Rahul Unnikrishnan, Rhys Thomas, Vahid Nekouie, Jie Luo, Dongchen Hu, Michael Preuss, Philip J. Withers   +10 more
wiley   +1 more source

A Summability Factor Theorem for Quasi-Power-Increasing Sequences

Journal of Inequalities and Applications, 2010
We establish a summability factor theorem for summability , where is lower triangular matrix with nonnegative entries satisfying certain conditions.
Savaş E
doaj  

A new result on the quasi power increasing sequences

Annales Universitatis Paedagogicae Cracoviensis: Studia Mathematica, 2020
This paper presents a theorem dealing with absolute matrix summability of infinite series. This theorem has been proved taking quasi β-power increasing sequence instead of almost increasing sequence.
Hikmet Seyhan Özarslan
doaj  

Summability of alterations of convergent series

International Journal of Mathematics and Mathematical Sciences, 1981
The effect of splitting, rearrangement, and grouping series alterations on the summability of a convergent series by ℓ−ℓ and cs−cs matrix methods is studied.
T. A. Keagy
doaj   +1 more source

A Novel Fuzzy Parameterized Fuzzy Hypersoft Set and Riesz Summability Approach Based Decision Support System for Diagnosis of Heart Diseases. [PDF]

Diagnostics (Basel), 2022
Rahman AU, Saeed M, Mohammed MA, Jaber MM, Garcia-Zapirain B.   +4 more
europepmc   +1 more source

Rafting of Ni‐Based Superalloys Under Multiaxial Load as Understood by Phase‐Field Simulations and Critical Experiments

Advanced Engineering Materials, EarlyView.
Phase‐field simulations coupled with dislocation‐density‐based crystal plasticity modeling reproduce γ′ rafting behavior in single‐crystal Ni‐based superalloys under varied loading conditions. The model captures both macroscopic creep and microscopic morphology evolution, with results matching high‐temperature creep experiments.
Micheal Younan, David Bürger, Gunther Eggeler, Oleg Shchyglo, Ingo Steinbach, Muhammad Adil Ali   +5 more
wiley   +1 more source