Results 11 to 20 of about 392,964 (284)
A Lower Estimate for Entropy Numbers
Journal of Approximation Theory, 2001 The \(k\)-th entropy number \(e_k(T)\) of a bounded and linear operator \(T:X \to Y\) between quasi-Banach spaces \(X\) and \(Y\) is defined as the infimum of the \(\delta\)'s such that the image by \(T\) of the unit ball of \(X\) can be covered by \(2^{k-1}\) balls of radius \(\delta\) in \(Y\). For the case when \(T\) is the identity operator between
Thomas Kühn
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Study of the reverse transition in pipe flow
Scientific Reports, 2023 In the reverse transition in pipe flow, turbulent flow changes to less disturbed laminar flow. The entropy of the flow appears to decrease. This study examined the reverse transition experimentally and theoretically using entropy change and momentum ...
Hikaru Yokoo +4 more
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Entropy and the Law of Small Numbers [PDF]
, 2004 Two new information-theoretic methods are introduced for establishing Poisson approximation inequalities. First, using only elementary information-theoretic techniques it is shown that, when $S_n=\sum_{i=1}^nX_i$ is the sum of the (possibly dependent ...
Harremoes, Peter +2 more
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Salem numbers of automorphisms of K3 surfaces with Picard number $4$
Comptes Rendus. Mathématique, 2023 We construct automorphisms of positive entropy of K3 surfaces of Picard number $4$ with certain Salem numbers. We also prove that there is a fixed point free automorphism of positive entropy on a K3 surface of Picard number $4$ with Salem degree $4$.
Lee, Kwangwoo
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Entropy, 2017 Entropy generation for a paramagnetic fluid in a square enclosure with thermomagnetic convection is numerically investigated under the influence of a magnetic quadrupole field. The magnetic field is calculated using the scalar magnetic potential approach.
Er Shi +3 more
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Scientific Reports, 2022 In this study, Galerkin Finite Element Method or GFEM is used for the modeling of mixed convection with the entropy generation in wavy lid-driven porous enclosure filled by the CNT-water nanofluid under the magnetic field. Two different cases of boundary
Hameed K. Hamzah +2 more
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Applied Sciences, 2015 This paper deals with the numerical simulation of heat transfer and entropy generation in a 2D square enclosure for convective melting. A thermal lattice Boltzmann method (TLBM) is used to handle the study, which has been conducted for Prandtl numbers ...
Alissar Yehya, Hassane Naji
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Entropy generation of a hybrid nanofluid on MHD mixed convection is a lid-driven cavity with partial heating having two rounded corners [PDF]
E3S Web of Conferences, 2021 This research aims to investigate thermal and flow behaviors and entropy generation of magnetohydrodynamic Al2O3-Cu/water hybrid nanofluid in a lid-driven cavity having two rounded corners.
Korei Zakaria, Benissaad Smail
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Entropy, 2004 : The entropy generation due to steady laminar forced convection fluid flow through parallel plates microchannel is investigated numerically. The effect of Knudsen, Reynolds, Prandtl, Eckert numbers and the nondimensional temperature difference on ...
Mohammad Al-Nimr +2 more
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A remark on entropy numbers [PDF]
Studia Mathematica, 2022 Talagrand's fundamental result on the entropy numbers is slightly improved. Our proof uses different ideas based on results from greedy approximation.
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