نتایج جستجو برای: rational normal scroll

تعداد نتایج: 626727  

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2013
Antony J Durston

The excitable cells of Dictyostelium discoideum show traveling waves of signaling and generate a variety of complex wave forms during their morphogenesis. Important among these wave forms is the 3D spiral or scroll wave, which has been proposed previously to have a twisted variant: the "turbine wave." Herein we argue that a D. discoideum scroll or concentric wave territory containing prespore a...

2007
Dequan Li

This Letter introduces a new chaotic member to the three-dimensional smooth autonomous quadratic system family, which derived from the classical Lorenz system but exhibits a three-scroll chaotic attractor. Interestingly, the two other scrolls are symmetry related with respect to the z-axis as for the Lorenz attractor, but the third scroll of this three-scroll chaotic attractor is around the z-a...

Journal: :Chaos 2008
Tamás Bánsági Oliver Steinbock

We report experimental results on spiral and scroll waves in the 1,4-cyclohexanedione Belousov-Zhabotinsky reaction. The propagating concentration waves are detected by two-dimensional photometry and optical tomography. Wave pulses can disappear in front-to-front and front-to-back collisions. This anomaly causes the nucleation of vortices from collisions of three nonrotating waves. In three-dim...

2004
IVAN CHELTSOV

In this paper we study cubic del Pezzo fibrations f : X → P such that the 3-fold X is smooth and rkPic(X) = 2. These are the examples of smooth 3-fold Mori fibre spaces. The 3-fold X is a divisor in the linear system |3M + nL| on the rational scroll Proj(⊕ i=1 OP1(di)), where n and di are integers, d1 ≥ d2 ≥ d3 ≥ d4 = 0, M is a tautological line bundle, and L is a fibre of the projection to P. ...

2016
Xiao-Ping Yuan Jiang-Xing Chen Ye-Hua Zhao Gui-Quan Liu He-Ping Ying

The dynamics of a scroll wave in an excitable medium with gradient excitability is studied in detail. Three parameter regimes can be distinguished by the degree of gradient. For a small gradient, the system reaches a simple rotating synchronization. In this regime, the rigid rotating velocity of spiral waves is maximal in the layers with the highest filament twist. As the excitability gradient ...

1999
Kei EGUCHI Takahiro INOUE Akio TSUNEDA

In this paper, a new digital chaos circuit which can generate multiple-scroll strange attractors is proposed. Being based on the piecewise-linear function which is determined by on-chip supervised learning, the proposed digital chaos circuit can generate multiple-scroll strange attractors. Hence, the proposed circuit can exhibit various bifurcation phenomena. By numerical simulations, the learn...

2002
Yuji Ono Kazuhiro Fukushima

Recently, the fluctuation-spectrum theory has been developed in order to characterize the fluctuation of stochastic time series [ 11. Some scaling properties of fluctuation spectra have been found near the intermittent transition point [2]. In experiment Fukushima et al. also showed scaling laws for an intermittency in a coupled chaos system [ 3 1. It is important to investigate the scaling pro...

2014
Bin Peng Jun Wang Zhenquan Liu BIN PENG JUN WANG ZHENQUAN LIU

The parts optimization are very important for scroll compressor design. According to existing problems of current optimization algorithm and actual optimization problems, the improved optimization algorithm—genetic-particle swarm optimization (GA-PSO) is proposed for scroll plate optimization. The optimization method integrates crossover of genetic algorithm (GA) and evolutionary mechanism of p...

Journal: :TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B 1988

Journal: :Scientific American 1910

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