Results 31 to 40 of about 805,934 (287)

Magnetic helicity in magnetohydrodynamic turbulence with a mean magnetic field [PDF]

open access: yes, 1995
A computational investigation of magnetic helicity of the fluctuatingmagnetic fieldHm in ideal and freely decaying three‐dimensional (3‐D) magnetohydrodynamics (MHD) in the presence of a uniform mean magnetic field is performed.
Bieber J. W.   +5 more
core   +2 more sources

Invariant means on an ideal [PDF]

open access: yesTransactions of the American Mathematical Society, 1985
Let G G be a compact abelian group and Q Q an invariant ideal of L ∞ ( G ) {L^\infty }(G) . Let M Q {M_Q} be the set of invariant means ν \nu on
openaire   +2 more sources

Vector-valued invariant means

open access: yesAequationes mathematicae, 2023
AbstractIn the paper, we will present some important results from the theory of vector-valued invariant means. Discussing the results contained in the author’s paper Badora (Ann Pol Math 58:147–159, 1993), we will add new facts that were previously not published.
openaire   +1 more source

Optimal transport and dynamics of expanding circle maps acting on measures [PDF]

open access: yes, 2013
Using optimal transport we study some dynamical properties of expanding circle maps acting on measures by push-forward. Using the definition of the tangent space to the space of measures introduced by Gigli, their derivative at the unique absolutely ...
Ambrosio, BENOÎT KLOECKNER, Krzyżewski
core   +3 more sources

Black-Box Optimization Using Geodesics in Statistical Manifolds

open access: yesEntropy, 2015
Information geometric optimization (IGO) is a general framework for stochastic optimization problems aiming at limiting the influence of arbitrary parametrization choices: the initial problem is transformed into the optimization of a smooth function on a
Jérémy Bensadon
doaj   +1 more source

Domain-Invariant Feature and Generative Adversarial Network Boundary Enhancement for Multi-Source Unsupervised Hyperspectral Image Classification

open access: yesRemote Sensing, 2023
Hyperspectral image (HIS) classification, a crucial component of remote sensing technology, is currently challenged by edge ambiguity and the complexities of multi-source domain data.
Tuo Xu, Bing Han, Jie Li, Yuefan Du
doaj   +1 more source

Invariant Means on Banach Spaces [PDF]

open access: yesAnnales Mathematicae Silesianae, 2017
Abstract In this paper we study some generalization of invariant means on Banach spaces. We give some sufficient condition for the existence of the invariant mean and some examples where we have not it.
openaire   +3 more sources

Boost-invariant mean field approximation and the nuclear Landau-Zener effect

open access: yes, 2007
We investigate the relation between time-dependent Hartree-Fock (TDHF) states and the adiabatic eigenstates by constructing a boost-invariant single-particle Hamiltonian.
J. A. Maruhn   +4 more
core   +1 more source

Non-normal parameter blowout bifurcation: an example in a truncated mean field dynamo model [PDF]

open access: yes, 1997
We examine global dynamics and bifurcations occurring in a truncated model of a stellar mean field dynamo. This model has symmetry-forced invariant subspaces for the dynamics and we find examples of transient type I intermittency and blowout bifurcations
Ashwin, Peter   +2 more
core   +2 more sources

Some results of Heron mean and Young’s inequalities

open access: yesJournal of Inequalities and Applications, 2018
In this paper, we will show some improvements of Heron mean and the refinements of Young’s inequalities for operators and matrices with a different method based on others’ results.
Changsen Yang, Yonghui Ren
doaj   +1 more source

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