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检索条件"任意字段=Conference on Chaos/Nonlinear Dynamics: Methods and Commercialization"

共 264 条记录，以下是111-120 订阅

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chaos-CHARACTERISTIC ANALYSIS OF SEWAGE INWARD-FLOW QUANTITY DATA BASED ON THE MAXIMAL LYAPUNOV INDEX ANALYSIS AND THE methods OF SUBSTITUTION

CHAOS-CHARACTERISTIC ANALYSIS OF SEWAGE INWARD-FLOW QUANTITY...

引用

International conference on Machine Learning and Cybernetics

作者： Chen, Jun-Xia Hebei Univ Sci & Technol Coll Econ & Management Shijiazhuang 050018 Peoples R China

ISBN: (纸本)9781424447053

This article conducts the research in view of the chaos characteristic of inward flow quantity data in Sewage Treatment Plant. During the research, we put to use small sampling time: tau(s) = 1 h, to avoid losing some partial information in the primary signal. First, we calculate the Lyapunov's maximal index to determine the chaos characteristics of time sequence based on the phase space restructuring foundation. Then there will be the CRP analysis to the sewage time series. At last, by using the substitution data law, we can eliminate the possibility that time series is quasi periodic, and we can get the conclusion that the time series of contaminated water volume is deterministic system produced by nonlinear dynamics.

关键词： chaos Time sequence Lyapunov's maximal index Substitution data analysis

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A Review of Diagnosis methods for Heart Rhythm Disorders

A Review of Diagnosis Methods for Heart Rhythm Disorders

引用

1st Annual ORNL Biomedical Science and Engineering conference

作者： Xia, Henian Zhao, Xiaopeng Bains, Jujhar Wortham, Dale C. Univ Tennessee Mech Aerosp & Biomed Engn Dept Knoxville TN 37996 USA Univ Tennessee Med Ctr Knoxville TN 37996 USA

ISBN: (纸本)9781424438372

The human cardiovascular system exhibits complicated dynamics. Various signal analysis techniques have been utilized to study electrocardiogram (ECG) rate and morphology for their potentials in diagnosis and prediction of cardiovascular diseases. Conventional methods of linear signal theory, including power spectral analysis and time-domain analysis, have been widely adopted to analyze heart rhythm disorders due to cardiomyopathy and fibrillation. However, the success of these techniques is often hampered by the nonstationary and nonlinear character of the heart's activities. To overcome these limitations, many techniques based on nonlinear dynamics and chaos theory have been developed. In this work, we investigate various existing techniques for their potential application in the diagnosis of rhythm disorders. This comparison of different methodologies can be used as a guideline in selecting proper ECG signal analysis techniques.

关键词： Signal analysis

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Complex dynamic optofluidics: Symbiotic nonlinear controls, self-pulsation, and chaos

Complex dynamic optofluidics: Symbiotic nonlinear controls, ...

引用

Laser Science, LS 2009

作者： Greenfield, Elad Rotschild, Carmel Lamhot, Yuval Szameit, Alexander Nemirovsky, Yoni Segev, Mordechai El-Ganainy, Ramy Christodoulides, Demetrios N. Saraf, Meirav Lifshitz, Efrat Physics Department Solid State Institute Technion Haifa 32000 Israel CREOL-College of Optics and Photonics University of Central Florida Orlando FL 32816 United States Chemistry Department Solid State Institute Technion Haifa 32000 Israel

We experimentally demonstrate dynamic nonlinear optofluidic controls: symbiotic action between light and fluid introduces a new class of high-level, entirely optofluidic devices, revealing a self-pulsating light-fluid... 详细信息

ISBN: (纸本)9781557528780

关键词： Laser beams Light beams Optofluidics Oscillators Phase space analysis methods Power spectra Other areas of optics (350.0350) Micro-optics (350.3950) Photothermal effects (350.5340)

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Topics on chaotic systems : selected papers from chaos 2008 International conference, Chania, Crete,

引用

2009年

作者： chaos

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Recent advances in non-intrusive polynomial chaos and stochastic collocation methods for uncertainty analysis and design

Recent advances in non-intrusive polynomial chaos and stocha...

引用

作者： Eldred, M.S. Optimization and Uncertainty Estimation Department Sandia National Laboratories MS-1318 Albuquerque NM 87185 United States

ISBN: (纸本)9781563479731

Non-intrusive polynomial chaos expansion (PCE) and stochastic collocation (SC) methods are attractive techniques for uncertainty quantification (UQ) due to their strong mathematical basis and ability to produce functional representations of stochastic variability. PCE estimates coefficients for known orthogonal polynomial basis functions based on a set of response function evaluations, using sampling, linear regression, tensor-product quadrature, or Smolyak sparse grid approaches. SC, on the other hand, forms interpolation functions for known coefficients, and requires the use of structured collocation point sets derived from tensor product or sparse grids. When tailoring the basis functions or interpolation grids to match the forms of the input uncertainties, exponential convergence rates can be achieved with both techniques for a range of probabilistic analysis problems. In addition, analytic features of the expansions can be exploited for moment estimation and stochastic sensitivity analysis. In this paper, the latest ideas for tailoring these expansion methods to numerical integration approaches will be explored, in which expansion formulations are modified to best synchronize with tensor-product quadrature and Smolyak sparse grids using linear and nonlinear growth rules. The most promising stochastic expansion approaches are then carried forward for use in new approaches for mixed aleatory-epistemic UQ, employing second-order probability approaches, and design under uncertainty, employing bilevel, sequential, and multifidelity approaches. Copyright © 2009 by the American Institute of Aeronautics and Astronautics, Inc.

关键词： Uncertainty analysis

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Study on Bifurcation and chaos in Boost Converter Based on Energy Balance Model

Study on Bifurcation and Chaos in Boost Converter Based on E...

引用

IEEE PES Asia-Pacific Power and Energy Engineering conference (APPEEC)

作者： Quanmin Niu Zhizhong Ju Chengchao Qi Hengli Wang Department of Information Countermeasure Air Force Radar Academy Wuhan China

Based on boost converter operating in discontinuous mode, this paper proposes an energy balance model (EBM) for analyzing bifurcation and chaos phenomena of capacitor energy and output voltage when the converter parameter is varying. It is found that the capacitor energy and output voltage dynamic behaviors exhibit the typical period- doubling route to chaos by increasing the feedback gain constant K of proportional controller. The accurate position of the first bifurcation point and the iterative diagram of the capacitor energy with every K can be derived from EBM. Finally, the underlying causes for bifurcations and chaos of a general class of nonlinear systems such as power converters are analyzed from the energy balance viewpoint. Comparing with the discrete iterative model, EBM is simple and high accuracy .This model can be easily developed on the nonlinear study of the other converters.

关键词： Bifurcation chaos Power system modeling Capacitors Voltage Power system dynamics Sampling methods nonlinear dynamical systems Switching circuits DC-DC power converters

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chaos-CHARACTERISTIC ANALYSIS OF SEWAGE INWARD-FLOW QUANTITY DATA BASED ON THE MAXIMAL LYAPUNOV INDEX ANALYSIS AND THE methods OF SUBSTITUTION

CHAOS-CHARACTERISTIC ANALYSIS OF SEWAGE INWARD-FLOW QUANTITY...

引用

2009 International conference on Machine Learning and Cybernetics(2009机器学习与控制论国际会议)

作者： JUN-XIA CHEN College of Economics and Management Hebei University of Science and Technology Shijiazhuang 050018 China

This article conducts the research in view of the chaos characteristic of inward flow quantity data in Sewage Treatment Plant During the research, we put to use small sampling time: τs = 1 h, to avoid losing some partial information in the primary signal. First, we calculate the Lyapunov's maximal index to determine the chaos characteristics of time sequence based on the phase space restructuring foundation. Then there will be the CRP analysis to the sewage time series. At last, by using the substitution data law, we can eliminate the possibility that time series is quasi periodic, and we can get the conclusion that the time series of contaminated water volume is deterministic system produced by nonlinear dynamics.

关键词： chaos Time sequence Lyapunov's mazimal indez Substitution data analysis

来源：评论

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A review of diagnosis methods for heart rhythm disorders

A review of diagnosis methods for heart rhythm disorders

引用

Annual ORNL Biomedical Science & Engineering conference (BSEC)

作者： Henian Xia Xiaopeng Zhao Jujhar Bains Dale C. Wortham Biomedical Engineering Department University of Tennessee Knoxville TN USA Health Science Center University of Tennessee USA

ISBN: (纸本)9781424438372

关键词： Heart Rhythm Signal analysis Electrocardiography Humans Cardiovascular system Morphology Cardiovascular diseases Spectral analysis Time domain analysis

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Control methods on unstable periodic orbits of a chaotic dynamical system - Control chaos in buck converter

Control methods on unstable periodic orbits of a chaotic dyn...

引用

11th International conference on Optimization of Electrical and Electronic Equipment

作者： Ivan, Cosmin Serbanescu, Alexandru Petrom SA B Dul Petrochim 127 Pitesti Romania Mil Tech Acad Dept Commun Bucharest Romania

ISBN: (纸本)1424415446

Recently, there has been an extensive interest in research on the analysis and control of chaotic behavior in nonlinear systems. Various control problems can be defined for such systems, such as targeting the trajectories to a desired point, stabilizing unstable periodic orbits etc. In this paper we present the necessity and possibility to control chaotic dynamic systems. The first part of this paper describes the methods for the identification of Unstable Periodic Orbits (UPO) of a chaotic dynamic system. Some methods of control are applied to stabilize UPO embedded in the dynamics of the system. The chaos control was first advanced by Ott, Grebogi and York (OGY method). Finally, the resonant parametric perturbation method is applied to control chaos in buck converter. In particular, the effect of phase shift in the perturbing signal is studied.

关键词： chaos control

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Multivariate Chaotic Models vs Neural Networks in Predicting Storm Surge dynamics

Multivariate Chaotic Models vs Neural Networks in Predicting...

引用

International Joint conference on Neural Networks

作者： Siek, Michael Solomatine, Dimitri Velickov, Slavco UNESCO-IHE Institute for Water Education 2601 DA Delft P.O. Box 3015 Netherlands Department of Hydroinformatics UNESCO-IHE Institute for Water Education 2601 DA Delft P.O. Box 3015 Netherlands SKF Engineering and Research Centre Netherlands

ISBN: (纸本)9781424418206

The recently developed methods in nonlinear dynamics and chaos time series analysis are used in this study to analyze, delineate and quantify the underlying coastal water level and surge dynamics in the North Sea along several locations at the Dutch coast. This study analyzes seven water level and surge data sets, five of which characterize coastal locations and two relate to the open sea locations. Both the water level data and the surge data (with the astronomical fide removed) are analyzed. The main objective of this analysis is to delineate and quantify the underlying dynamics of the coastal water levels and to quantify the variability and predictability of the coastal dynamics along the Dutch coast based on time series of observables. Based on the reconstructed multivariate phase space of the water level and surge dynamics, adaptive multivariate local models were built which typically yield more reliable and accurate short-term predictions compared to neural networks.

关键词： Water levels

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