Zobrazeno 1 - 10
of 1 862
pro vyhledávání: '"SATO, NAOKI"'
Autor:
Sato, Naoki, Hori, Kumiko
This work tackles a significant challenge in dynamo theory: the possibility of long-term amplification and maintenance of an axisymmetric magnetic field. We introduce a novel model that allows for non-trivial axially-symmetric steady-state solutions
Externí odkaz:
http://arxiv.org/abs/2407.17527
Here, we investigate the thermoelectric properties of the marcasite-type compounds MSb$_2$ (M = Ta, Nb) in the temperature range of 310-730 K. These compounds were synthesized by a solid-state reaction followed by the spark plasma sintering process.
Externí odkaz:
http://arxiv.org/abs/2403.12484
Autor:
Sato, Naoki, Iiduka, Hideaki
For nonconvex objective functions, including deep neural networks, stochastic gradient descent (SGD) with momentum has fast convergence and excellent generalizability, but a theoretical explanation for this is lacking. In contrast to previous studies
Externí odkaz:
http://arxiv.org/abs/2402.02325
Autor:
Sato, Naoki, Morrison, Philip J.
Publikováno v:
Fundamental Plasma Physics 10, 100054 (2024)
The phase space of a noncanonical Hamiltonian system is partially inaccessible due to dynamical constraints (Casimir invariants) arising from the kernel of the Poisson tensor. When an ensemble of noncanonical Hamiltonian systems is allowed to interac
Externí odkaz:
http://arxiv.org/abs/2401.15086
Autor:
Sato, Naoki, Iiduka, Hideaki
The graduated optimization approach is a heuristic method for finding globally optimal solutions for nonconvex functions and has been theoretically analyzed in several studies. This paper defines a new family of nonconvex functions for graduated opti
Externí odkaz:
http://arxiv.org/abs/2311.08745
Autor:
Sato, Naoki, Yamada, Michio
This paper studies the nonlinear evolution of magnetic field turbulence in proximity of steady ideal MHD configurations characterized by a small electric current, a small plasma flow, and approximate flux surfaces, a physical setting that is relevant
Externí odkaz:
http://arxiv.org/abs/2311.03095
The Clebsch representation of a velocity field represents an effective tool for the analysis of physical properties of fluid flows. Indeed, a suitable choice of Clebsch potentials can be used to extract structural features that would otherwise be hid
Externí odkaz:
http://arxiv.org/abs/2305.16673
Autor:
Sato, Naoki, Yamada, Michio
Publikováno v:
Physica D 459 (2024) 134031
The Generalized Hasegawa-Mima (GHM) equation, which generalizes the standard Hasegawa-Mima (HM) equation, is a nonlinear equation describing the evolution of drift wave turbulence in curved magnetic fields. The GHM equation can be obtained from a dri
Externí odkaz:
http://arxiv.org/abs/2305.16668