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Author: Johan Grasman
Publisher: Springer Science & Business Media
ISBN: 1461210569
Category : Science
Languages : en
Pages : 229
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Book Description
In various fields of science, notably in physics and biology, one is con fronted with periodic phenomena having a remarkable temporal structure: it is as if certain systems are periodically reset in an initial state. A paper of Van der Pol in the Philosophical Magazine of 1926 started up the investigation of this highly nonlinear type of oscillation for which Van der Pol coined the name "relaxation oscillation". The study of relaxation oscillations requires a mathematical analysis which differs strongly from the well-known theory of almost linear oscillations. In this monograph the method of matched asymptotic expansions is employed to approximate the periodic orbit of a relaxation oscillator. As an introduction, in chapter 2 the asymptotic analysis of Van der Pol's equation is carried out in all detail. The problem exhibits all features characteristic for a relaxation oscillation. From this case study one may learn how to handle other or more generally formulated relaxation oscillations. In the survey special attention is given to biological and chemical relaxation oscillators. In chapter 2 a general definition of a relaxation oscillation is formulated.
Author: Johan Grasman
Publisher: Springer Science & Business Media
ISBN: 1461210569
Category : Science
Languages : en
Pages : 229
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Book Description
In various fields of science, notably in physics and biology, one is con fronted with periodic phenomena having a remarkable temporal structure: it is as if certain systems are periodically reset in an initial state. A paper of Van der Pol in the Philosophical Magazine of 1926 started up the investigation of this highly nonlinear type of oscillation for which Van der Pol coined the name "relaxation oscillation". The study of relaxation oscillations requires a mathematical analysis which differs strongly from the well-known theory of almost linear oscillations. In this monograph the method of matched asymptotic expansions is employed to approximate the periodic orbit of a relaxation oscillator. As an introduction, in chapter 2 the asymptotic analysis of Van der Pol's equation is carried out in all detail. The problem exhibits all features characteristic for a relaxation oscillation. From this case study one may learn how to handle other or more generally formulated relaxation oscillations. In the survey special attention is given to biological and chemical relaxation oscillators. In chapter 2 a general definition of a relaxation oscillation is formulated.
Author: Nikolaĭ Nikolaevich Bogoli︠u︡bov
Publisher: CRC Press
ISBN: 9780677200507
Category : Science
Languages : en
Pages : 556
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Book Description
Author: Johan Grasman
Publisher:
ISBN:
Category :
Languages : en
Pages : 19
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Author: Elena V. Grigorieva
Publisher: Birkhäuser
ISBN: 3319428608
Category : Science
Languages : en
Pages : 233
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Book Description
In this book we analyze relaxation oscillations in models of lasers with nonlinear elements controlling light dynamics. The models are based on rate equations taking into account periodic modulation of parameters, optoelectronic delayed feedback, mutual coupling between lasers, intermodal interaction and other factors. With the aim to study relaxation oscillations we present the special asymptotic method of integration for ordinary differential equations and differential-difference equations. As a result, they are reduced to discrete maps. Analyzing the maps we describe analytically such nonlinear phenomena in lasers as multistability of large-amplitude relaxation cycles, bifurcations of cycles, controlled switching of regimes, phase synchronization in an ensemble of coupled systems and others. The book can be fruitful for students and technicians in nonlinear laser dynamics and in differential equations.
Author: E. Mishchenko
Publisher: Springer Science & Business Media
ISBN: 1461590477
Category : Science
Languages : en
Pages : 235
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Book Description
A large amount of work has been done on ordinary differ ential equations with small parameters multiplying deriv atives. This book investigates questions related to the asymptotic calculation of relaxation oscillations, which are periodic solutions formed of sections of both sl- and fast-motion parts of phase trajectories. A detailed discussion of solutions of differential equations involving small parameters is given for regions near singular points. The main results examined were obtained by L.S. Pontryagin and the authors. Other works have also been taken into account: A.A. Dorodnitsyn's investigations of Van der Pol's equation, results obtained by N.A. Zheleztsov and L.V. Rodygin concerning relaxation oscillations in electronic devices, and results due to A.N. Tikhonov and A.B. Vasil'eva concerning differential equations with small parameters multiplying certain derivatives. E.F. Mishchenko N. Kh. Rozov v CONTENTS Chapter I. Dependence of Solutions on Small Parameters. Applications of Relaxation Oscillations 1. Smooth Dependence. Poincare's Theorem . 1 2. Dependence of Solutions on a Parameter, on an Infinite Time Interval 3 3. Equations with Small Parameters 4 Multiplying Derivatives 4. Second-Order Systems. Fast and Slow Motion.
Author: Evgeniĭ Frolovich Mishchenko
Publisher:
ISBN:
Category : Mathematics
Languages : en
Pages : 304
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Book Description
Furthers the construction of a full asymptotic theory of relaxation oscillations begun by earlier authors, and contains the results of a number of new problems, especially in systems of parabolic partial differential equations. Considers a singularly perturbed system to be one in which as the parame
Author: A. I︠U︡ Kolesov
Publisher: American Mathematical Soc.
ISBN: 9780821804100
Category : Mathematics
Languages : en
Pages : 140
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Book Description
This book presents for the first time a systematic exposition of techniques for constructing relaxation oscillations and methods for investigating stability properties of certain classes of systems with delay. The authors bring out some of the distinctive features that have no analogues in relaxation systems of ordinary differential equations. The exposition provides analysis of significant examples from biophysics, mathematical ecology, and quantum physics that elucidate important patterns. Many unsolved problems are posed. The book would appeal to researchers and specialists interested in the theory and applications of relaxation oscillations.
Author: E.F. Mishchenko
Publisher: Springer
ISBN: 9781461523772
Category : Mathematics
Languages : en
Pages : 0
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Book Description
There are many books devoted to ordinary differential equations con taining small parameters (small perturbations). The investigation of the dependence of solutions, in a finite time interval, on regular perturbations (the small parameter regularly appears on the right-hand sides of the equa tions) was carried out by Poincare and was practically completed long ago. However, problems connected with singular perturbations still attract the attention of mathematicians. This is what we understand by a singularly perturbed system: a system of differential equations dependent on a small parameter is said to be singularly perturbed if, as the parameter tends to zero, Cauchy's resolvent operator for the main range of time values and initial conditions from bounded sets (or the Poincare operator) converges, in a suitable topology, to a limit object acting in a space of smaller dimension. In different cases this general idea of a singularly perturbed system becomes specific and leads to numerous important and interesting problems. A certain class of these problems was only recently considered in mono graphic literature. This class includes problems connected with the so-called relaxation oscillations, a phenomenon well known to physicists, mechani cians, chemists, and ecologists. Van der Pol, Andronov, Haag, Dorodnitsyn, Stoker, Zheleztsov and others were the first to study relaxation oscillations. A comprehensive study of this phenomenon is hindered by considerable mathematical difficulties and requires the development of new asymptotic methods in the theory of differential equations. These methods, interesting in themselves, lead to the statement of new mathematical problems.
Author: Nikolaĭ Nikolaevich Bogoli︠u︡bov
Publisher:
ISBN:
Category : Asymptotes
Languages : en
Pages : 898
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Author: N. N. Bogoliubov
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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