A5006170990- Nonlinear Dynamics and Pattern Formation
- Chaos control and synchronization
- stochastic dynamics and bifurcation
- Magnetic properties of thin films
- Quantum chaos and dynamical systems
- Magnetic Properties and Applications
- Mechanical and Optical Resonators
- Characterization and Applications of Magnetic Nanoparticles
- Mathematical Dynamics and Fractals
- Theoretical and Computational Physics
- Magnetic Properties of Alloys
- Gyrotron and Vacuum Electronics Research
- Magneto-Optical Properties and Applications
- Advanced Differential Equations and Dynamical Systems
- Metallic Glasses and Amorphous Alloys
- Plant Reproductive Biology
- Geomagnetism and Paleomagnetism Studies
- Adhesion, Friction, and Surface Interactions
- Tribology and Lubrication Engineering
- Neural Networks and Applications
- Microstructure and Mechanical Properties of Steels
- Experimental and Theoretical Physics Studies
- Magnetic and transport properties of perovskites and related materials
- Advanced Chemical Sensor Technologies
- Advanced Research in Systems and Signal Processing
Shonan Institute of Technology
2020-2024
Yamagata University
2006-2021
Meiji University
2011-2020
Utsunomiya University
1996-2015
Chiba Institute of Technology
2015
University of Tsukuba
2012
Hitachi (Japan)
1991-2005
Dokkyo University
2005
Hitachi Maxell (Japan)
1999-2004
Keio University
1986-2003
Developments of magnetic head, recording medium, positioning, and signal processing technologies made it possible to perform at an areal density 2 Gb/in/sup 2/ on a prototype 3.5-in diameter hard disk drive. A track 17 kTPI, which is comparable or even greater than that used in optical storage systems, minimize the reduction physical clearance between medium head. The authors outline system its component technologies. read/write characteristics are also reported.< <ETX...
Compositional and temperature dependencies of saturation magnetization (M/sub s/) uniaxial magnetocrystalline anisotropy (K/sub u/) are determined using single crystal CoCr-alloy thin films. Temperature M/sub s/ K/sub u/ stronger with increasing Cr content. s/(OK) Curie (T/sub c/) decrease linearly content in a Co-Cr-X (X=Ta, Pt) system. T/sub c/ become zero at the concentration 33 at.%, Co-Cr-Pt specimens have higher than those Co-Cr-Ta similar concentration. The magnetic properties...
The dynamics of Bonhoeffer–van der Pol (BVP) oscillators are known to be equivalent those the FitzHugh–Nagumo model and have been extensively studied for many years. In a previous work (Inaba Kousaka, 2020), we discovered nested mixed-mode oscillations (MMOs) generated by piecewise-smooth driven oscillator. this study, focus on MMOs that occur between 1s- 1s+1-generating regions s=2 3 in classical BVP oscillator where nonlinear conductor is expressed as third-order polynomial function,...
Chaos via torus breakdown in the piecewise-linear forced van de Pol equation is studied rigorously by using degenerate technique. The model a negative resistance LC oscillator including diode driven sinusoidal voltage source. authors investigate an idealized case where assumed to operate as ideal switch. In this case, Poincare map derived strictly one-dimensional return mapping of circuit onto itself. This clarifies onset chaos observed circuit. obtain critical value bifurcation parameter...
This paper discusses nested mixed-mode oscillations (MMOs) generated by a nonautonomousBonhoeffer–van der Pol oscillator with diode. We use our previously-proposed constrained piecewise-smooth dynamics, where the diode is assumed to operate as switch (Kousaka et al., 2017). idealized model corresponds degenerate case in which one of parameters tends infinity and circuit dynamics are represented one-variable piecewise nonautonomous equation, enabling one-dimensional Poincaré return maps be...
In our previous studies (Inaba and Kousaka, (2020); Inaba Tsubone, (2020)), we discovered bifurcation structures represented by nested mixed-mode oscillations (MMOs) generated a driven Bonhoeffer–van der Pol (BVP) oscillator. BVP oscillators are equivalent to FitzHugh–Nagumo models have been subject of intense research for the last six decades. this study, consider case in which diode included oscillator is assumed operate as an ideal switch. case, Poincaré return maps can be rigorously...
Co epitaxial thin films were prepared on single-crystal MgO substrates of (100), (110), and (111) planes heated at 300degC by ultra high vacuum molecular beam epitaxy. The film crystal structure varies depending the substrate orientation. On MgO(100) substrate, a Co(112macr0) bi-crystalline with an hcp is obtained. A Co(110) fcc formed MgO(110) whereas Co(0001) grown MgO(111) substrate. growth follows Volmer-Weber mode. in-plane magnetization properties reflect magnetocrystalline anisotropy...
Bifurcations of complex mixed-mode oscillations denoted as oscillation-incrementing bifurcations (MMOIBs) have frequently been observed in chemical experiments. In a previous study [K. Shimizu et al., Physica D 241, 1518 (2012)], we discovered an extremely simple dynamical circuit that exhibits MMOIBs. Our model was represented by slow/fast Bonhoeffer-van der Pol under weak periodic perturbation near subcritical Andronov-Hopf bifurcation point. this study, experimentally and numerically...
In previous works [Inaba & Kousaka, 2020; Inaba Tsubone, et al., 2023], significant bifurcation structures referred to as nested Mixed-Mode Oscillations (MMOs) were found be present in forced Bonhoeffer–van der Pol (BVP) oscillators. It is well known that unnested Oscillation-Incrementing Bifurcations (MMOIBs) can generate [Formula: see text] oscillations (i.e. followed by repeated times) for successive values of text], where and are adjacent fundamental simple MMOs, e.g. an integer....
Two types of windows are found in a symmetric circuit that cannot be seen the logistic map and inherent structure this circuit. One type window exhibits complex bifurcation phenomena such as symmetry breaking recovering its own region, while other appears when one chaotic attractor bifurcates to two periodic attractors. The authors derive one-dimensional Poincare from by degeneration technique prove rigorously appear alternatively infinitely many times inside some applying certain scaling...
In this paper, we analyze the sudden change from chaos to oscillation death generated by Bonhoeffer--van der Pol (BVP) oscillator under weak periodic perturbation. The parameter values of BVP are chosen such that a stable focus and relaxation coexist if no perturbation is applied. system, complicated bifurcation structure expected emerge when applied because in close proximity phase plane. We draw diagram fundamental harmonic entrainment. complex there two sets. One set vicinity focus, other...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Munehisa Sekikawa, Naohiko Inaba, Kyohei Kamiyama, Kazuyuki Aihara; Three-dimensional tori Arnold tongues. Chaos 1 March 2014; 24 (1): 013137. https://doi.org/10.1063/1.4869303 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Dropdown...
Piecewise-linear Bonhoeffer–van der Pol dynamics explaining mixed-mode oscillation-incrementing bifurcations Kuniyasu Shimizu1,∗ and Naohiko Inaba2 1Department of Electrical, Electronics Computer Engineering, Chiba Institute Technology, 275-0016, Japan 2Organization for the Strategic Coordination Research Intellectual Property, Meiji University, Kawasaki 214-8571, ∗E-mail: kuniyasu.shimizu@it-chiba.ac.jp