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Search Results: 1 - 10 of 191 matches for " Atsuya Otani "
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An entropy formula for a non-self-affine measure with application to Weierstrass-type functions
Atsuya Otani
Mathematics , 2015,
Abstract: Let $ \tau : [0,1] \rightarrow [0,1] $ be a piecewise expanding map with full branches. Given $ \lambda : [0,1] \rightarrow (0,1) $ and $ g : [0,1] \rightarrow \mathbb{R} $ satisfying $ \tau ' \lambda > 1 $, we study the Weierstrass-type function \[ \sum _{n=0} ^\infty \lambda ^n (x) \, g (\tau ^n (x)), \] where $ \lambda ^n (x) := \lambda(x) \lambda (\tau (x)) \cdots \lambda (\tau ^{n-1} (x)) $. Under certain conditions, Bedford proved that the box counting dimension of its graph is given as the unique zero of the topological pressure function \[ s \mapsto P ((1-s) \log \tau ' + \log \lambda) . \] We give a sufficient condition under which the Hausdorff dimension also coincides with this value. We adopt a dynamical system theoretic approach which was originally used to investigate special cases including the classical Weierstrass functions. For this purpose we prove a new Ledrappier-Young entropy formula, which is a conditional version of Pesin's formula, for non-invertible dynamical systems. Our formula holds for all lifted Gibbs measures on the graph of the above function, which are generally not self-affine.
Bifurcation and Hausdorff dimension in families of chaotically driven maps with multiplicative forcing
Gerhard Keller,Atsuya Otani
Physics , 2012,
Abstract: We study bifurcations of invariant graphs in skew product dynamical systems driven by hyperbolic surface maps T like Anosov surface diffeomorphisms or baker maps and with one-dimensional concave fibre maps under multiplicative forcing when the forcing is scaled by a parameter r=e^{-t}. For a range of parameters two invariant graphs (a trivial and a non-trivial one) coexist, and we use thermodynamic formalism to characterize the parameter dependence of the Hausdorff and packing dimension of the set of points where both graphs coincide. As a corollary we characterize the parameter dependence of the dimension of the global attractor A_t: Hausdorff and packing dimension have a common value dim(A_t), and there is a critical parameter t_c determined by the SRB measure of T^{-1} such that dim(A_t)=3 for t < t_c and t --> dim(A_t) is strictly decreasing for t_c < t < t_{max}.
Spermatocele Presenting as Acute Scrotum
Atsuya Hikosaka,Yutaka Iwase
Urology Journal , 2008,
Dynamical Induction of s-wave Component in d-wave Superconductor Driven by Thermal Fluctuations
Atsuya Kumagai,Hiromichi Ebisawa
Physics , 1998, DOI: 10.1143/JPSJ.67.3585
Abstract: We investigated the mutual induction effects between the d-wave and the s-wave components of order parameters due to superconducting fluctuation above the critical temperatures and calculated its contributions to paraconductivity and excess Hall conductivity based on the two-component stochastic TDGL equation. It is shown that the coupling of two components increases paraconductivity while it decreases excess Hall conductivity compared to the cases when each component fluctuates independently. We also found the singular behavior in the paraconductivity and the excess Hall conductivity dependence on the coupling parameter which is consistent with the natural restriction among the coefficients of gradient terms.
Rede de saúde do trabalhador para o estado de S?o Paulo
Otani, Koshiro;
S?o Paulo em Perspectiva , 2003, DOI: 10.1590/S0102-88392003000100009
Abstract: this article considers various ministry of health documents and contributions by members of the intra-sectorial commission on workers' health, created to integrate and harmonize the work of various sectors of the s?o paulo state secretariat of workers' health to address the issue of health and labor. this commission developed the action plan for workers' health for the state of s?o paulo (for the years 2002-2003-2004), which set as its top priority the creation of a model for workers' health that envisioned a network of technical references for treatment, prevention, and training.
Erratum to “Site-Specific Antioxidative Therapy for Prevention of Atherosclerosis and Cardiovascular Disease”
Hajime Otani
Oxidative Medicine and Cellular Longevity , 2013, DOI: 10.1155/2013/936436
Cooper Pair Formation in U(1) Gauge Theory of High Temperature Superconductivity
Atsuya Kumagai,Masahiko Hayashi,Hiromichi Ebisawa
Physics , 2000, DOI: 10.1143/JPSJ.70.509
Abstract: We study the two-dimensional spin-charge separated Ginzburg-Landau theory containing U(1) gauge interactions as a semi-phenomenological model describing fluctuating condensates in high temperature superconductivity. Transforming the original GL action, we abstract the effective action of Cooper pair. Especially, we clarify how Cooper pair correlation evolves in the normal state from the point of view of spin-charge separation. Furthermore, we point out how Cooper pair couples to gauge field in a gauge-invariant way, stressing the insensitivity of Cooper pair to infrared gauge field fluctuation.
Smart Inverter Functionality Testing for Battery Energy Storage Systems  [PDF]
Jun Hashimoto, Taha Selim Ustun, Kenji Otani
Smart Grid and Renewable Energy (SGRE) , 2017, DOI: 10.4236/sgre.2017.811022
Abstract: Variable distributed energy resources (DERs) such as photovoltaic (PV) systems and wind power systems require additional power resources to control the balance between supply and demand. Battery energy storage systems (BESSs) are one such possible resource for providing grid stability. It has been proposed that decentralized BESSs could help support microgrids (MGs) with intelligent control when advanced functionalities are implemented with variable DERs. One key challenge is developing and testing smart inverter controls for DERs. This paper presents a standardized method to test the interoperability and functionality of BESSs. First, a survey of grid-support standards prevalent in several countries was conducted. Then, the following four interoperability functions defined in IEC TR 61850-90-7 were tested: the specified active power from storage test (INV4), the var-priority Volt/VAR test (VV) and the specified power factor test (INV3) and frequency-watt control (FW). This study then out-lines the remaining technical issues related to basic BESS smart inverter test protocols.
Ant Colony Optimization Routing Algorithm with Tabu Search
Masaya Yoshikawa,Kazuo Otani
Lecture Notes in Engineering and Computer Science , 2010,
Global bifurcation result for the p-biharmonic operator
Pavel Drabek,Mitsuharu Otani
Electronic Journal of Differential Equations , 2001,
Abstract: We prove that the nonlinear eigenvalue problem for the p-biharmonic operator with $p > 1$, and $Omega$ a bounded domain in $mathbb{R}^N$ with smooth boundary, has principal positive eigenvalue $lambda_1$ which is simple and isolated. The corresponding eigenfunction is positive in $Omega$ and satisfies $frac{partial u}{partial n} < 0$ on $partial Omega$, $Delta u_1 < 0$ in $Omega$. We also prove that $(lambda_1,0)$ is the point of global bifurcation for associated nonhomogeneous problem. In the case $N=1$ we give a description of all eigenvalues and associated eigenfunctions. Every such an eigenvalue is then the point of global bifurcation.
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