Results 1 to 10 of about 56,089 (229)

Pullback dynamics and robustness for the 3D Navier-Stokes-Voigt equations with memory

Electronic Research Archive, 2023
The tempered pullback dynamics and robustness of the 3D Navier-Stokes-Voigt equations with memory and perturbed external force are considered in this paper.
Keqin Su, Rong Yang
doaj   +2 more sources

Pullback dan Pushout di Kategori Modul Topologis [PDF]

Jurnal Matematika Integratif, 2022
A pullback of two morphisms with a common codomain $f\colon A\to C$ and $g\colon B\to C$ is the limit of a diagram consisting $f$ and $g$. The dual notion of a pullback is called a pushout. A pushout of two morphisms with a common domain $k\colon A\to B$
Yunita Septriana Anwar, Indah Emilia Wijayanti, Budi Surodjo, Dewi Kartika Sari   +3 more
doaj   +2 more sources

Cosmic Crystallography with a Pullback [PDF]

Physics Letters A, 1999
We present a modified version of the cosmic crystallography method, especially useful for testing closed models of negative spatial curvature. The images of clusters of galaxies in simulated catalogs are ``pulled back'' to the fundamental domain before ...
Best, Cornish, Evelise Gausmann, Fagundes, Fagundes, Helio V Fagundes, Lachièze-Rey, Lehoucq   +7 more
core   +6 more sources

Pullback 𝒟-Attractor of Nonautonomous Three-Component Reversible Gray-Scott System on Unbounded Domains [PDF]

Abstract and Applied Analysis, 2013
The long time behavior of solutions of the nonautonomous three-components reversible Gray-Scott system defined on the entire space ℝn is studied when the external forcing terms are unbounded in a phase space.
Anhui Gu
doaj   +2 more sources

Impact of pullback speed on evaluation of lipid core plaque using near-infrared spectroscopy-intravascular ultrasound. [PDF]

Cardiovasc Interv Ther
Kasahara T, Kitahara H, Takou K, Tateishi K, Saito Y, Kato K, Iimori T, Kobayashi Y.   +7 more
europepmc   +3 more sources

Pullback parking functions

The American Journal of Combinatorics
We introduce a generalization of parking functions in which cars are limited in their movement backwards and forwards by two nonnegative integer parameters \(k\) and \(\ell\), respectively.
Jennifer Elder, Pamela Harris, Lybitina Koene, Ilana Lavene, Lucy Martinez, Molly Oldham   +5 more
doaj   +3 more sources

Classification of 1-absorbing comultiplication modules over a pullback ring [PDF]

Categories and General Algebraic Structures with Applications, 2023
One of the aims of the modern representation theory is to solve classification problems for subcategories of modules over a unitary ring R. In this paper, we introduce the concept of 1-absorbing comultiplication modules and classify 1-absorbing ...
Farkhondeh Farzalipour, Peyman Ghiasvand
doaj   +1 more source

Finite fractal dimension of pullback attractors for a nonclassical diffusion equation

AIMS Mathematics, 2022
In this paper, we investigate the finite fractal dimension of pullback attractors for a nonclassical diffusion equation in $ H^1_0(\Omega) $. First, we prove the existence of pullback attractors for a nonclassical diffusion equation with arbitrary ...
Xiaolei Dong, Yuming Qin
doaj   +1 more source

Flatness properties of acts over semigroups [PDF]

Categories and General Algebraic Structures with Applications, 2021
In this paper we study flatness properties (pullback flatness, limit flatness, finite limit flatness) of acts over semigroups. These are defined by requiring preservation of certain limits from the functor of tensor multiplication by a given act. We give
Valdis Laan, Ülo Reimaa, Lauri Tart, Elery Teor   +3 more
doaj   +1 more source

An Improved Model to Calculate Pullback Force of Trenchless Horizontal Directional Drilling Pipeline

Advances in Civil Engineering, 2022
In the pullback operation of horizontal directional drilling pipeline crossing, the existing calculation and prediction models of pullback force are relatively simple.
Xiao-qiang Liang, Da Hu, Yong-suo Li, Xian Yang, Lei Jiang, Yun-yi Zhang   +5 more
doaj   +1 more source