4 papers
Group-Theoretic Upper Bounds on Reconstructability in Inverse Problems
Isshin Arai, Tomoaki Itano
Reconstructing the causal structure of physical systems from observational data constitutes a fundamental inverse problem. Here we show that the reconstruction dimension---defined…
Nonlinear Aggregation of Phase Elements on the Unit Circle under Parametric External Fields
Isshin Arai, Tomoaki Itano, Masako Sugihara-Seki
We investigate nonlinear aggregation dynamics of phase elements distributed on the unit circle under parametrically modulated external fields. Our model, inspired by flaky particle…
Probabilistic description of flake orientation suspended in rotating wave flows
Tomoaki Itano, Isshin Arai
In fluid dynamics experiments, flake-based flow visualization is a common technique to capture flow structures through the rays reflected from flat tracers suspended in the fluid.…
Revisiting visualization of spiral states in a wide-gap spherical Couette flow
Isshin Arai, Tomoaki Itano, Masako Sugihara-Seki
A pioneering study conducted by Egbers and Rath [Acta Mech. 111 pp. 125--140 (1995)] experimentally captured spiral waves to elucidate the transition in the wide-gap spherical Coue…