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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 ...
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Prognostic Implications of Prestent Pullback Pressure Gradient and Poststent Quantitative Flow Ratio in Patients Undergoing Percutaneous Coronary Intervention [PDF]
Journal of the American Heart Association : Cardiovascular and Cerebrovascular Disease, 2022 Background Coronary diffuse disease associates with poor outcomes, but little is known about its role after percutaneous coronary intervention (PCI). We aimed to investigate the prognostic implication of pre‐PCI focal or diffuse disease patterns combined
N. Dai +14 more
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A pullback operation on a class of currents [PDF]
Annales de l'Institut Fourier, 2020 For any holomorphic map $f\colon X\to Y$ between a complex manifold $X$ and a complex Hermitian manifold $Y$ we extend the pullback $f^*$ from smooth forms to a class of currents in a cohomologically sound way.
Kalm, Håkan Samuelsson
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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
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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
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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 +3 more
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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 +5 more
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Existence of pullback attractors for pullback asymptotically compact processes [PDF]
Nonlinear Analysis: Theory, Methods & Applications, 2010 This paper is concerned with the existence of pullback attractors for evolution processes. Our aim is to provide results that extend the following results for autonomous evolution processes (semigroups) i) An autonomous evolution process which is bounded dissipative and asymptotically compact has a global attractor.
Caraballo Garrido, Tomás +3 more
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On the $K$-theory of pullbacks [PDF]
Annals of Mathematics, 2019 To any pullback square of ring spectra we associate a new ring spectrum and use it to describe the failure of excision in algebraic $K$-theory. The construction of this new ring spectrum is categorical and hence allows to determine the failure of excision for any localizing invariant in place of $K$-theory.
Land, Markus, Tamme, Georg
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南方能源建设, 2021 [Introduction] Trenchless horizontal directional drilling is widely used in power cable line project to cross natural or artificial obstacles at present.Multiple cable protection tubes need to be laid successfully at one time in engineering applications.
CAO Bo, HUANG Longxiang, LUO Yan
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