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1991

Volume 33, Issue 4, pp. 519-694


Frequency Content of Randomly Scattered Signals

M. Asch, W. Kohler, G. Papanicolaou, M. Postel, and B. White

SIAM Rev. 33, pp. 519-625 (107 pages) | Cited 67 times

Online Publication Date: July 18, 2006

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The statistical properties of acoustic signals reflected by a randomly layered medium are analyzed when a pulsed spherical wave issuing from a point source is incident upon it. The asymptotic analysis of stochastic equations and geometrical acoustics is used to arrive at a set of transport equations that characterize multiply scattered signals observed at the surface of the layered medium. The results of extensive numerical simulations are presented, illustrating the scope of the theory. A number of inverse problems for randomly layered media are also formulated where we recover large-scale properties of the sound speed profile from the statistics of reflected signals.

Nonlinear and Stochastic Phenomena: The Grand Challenge for Partial Differential Equations

James Glimm

SIAM Rev. 33, pp. 626-643 (18 pages) | Cited 8 times

Online Publication Date: July 18, 2006

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The major problems for partial differential equations are either nonlinear or stochastic or both. Considerable progress has occurred recently in these areas, much of which has resulted from a striking interplay among theory, computation, and applications.
The nonlinear structures emphasized here are the nonlinear hyperbolic waves, which occur in the solutions of nonlinear hyperbolic conservation laws and associated dissipative equations. These equations are those most commonly used to model physical and chemical processes in continuum systems. In one space dimension these nonlinear waves form traveling waves, for which the methods of dynamical systems and bifurcation theory are very useful. Established points of view toward mathematical theories have been challenged by recent work (e.g., uniqueness of solutions, entropy conditions, and elliptic regions in hyperbolic equations). A type of geometry is defined in the state space of the conservation law by the nonlinear waves. This geometry is generically singular in the case of nonlinear resonance. A regularizing space, called the Fundamental Wave Manifold, has been constructed which removes nonessential singularities in this geometry; the remaining, essential, sin-gularities serve as organizing centers for the bifurcation of the nonlinear hyperbolic waves.
Stochastic solutions of partial differential equations may result from stochastic data, for example, in the form of random initial conditions or equation coefficients. This phenomenon can be called forced, driven, or external chaos. Stochastic solutions can also result from internal considerations, i.e., from instabilities inherent in the equation itself, if the equation is nonlinear. The instabilities which give rise to chaotic solutions are generally unstable on a very large range of length scales, or in some approximation, on all length scales. Fractal geometries provide one model for the typically intermittent, or blotchy, chaos which can occur, and the renormalization group is an analytic tool which in some cases has given a quantitatively correct theory of chaotic solutions of partial differential equations.

The Electric Bell as a Nonlinear Oscillator

W. O. Criminale and T. F. Mar

SIAM Rev. 33, pp. 644-649 (6 pages) | Cited 1 time

Online Publication Date: July 18, 2006

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A nonlinear autonomous model is constructed to explain the fundamental motion of the electric doorbell. Operation is graphically depicted under a variety of physical conditions by numerical integration of the governing equations.

Measuring the Speed and Altitude of an Aircraft Using Similar Triangles

Hassan Sedaghat

SIAM Rev. 33, pp. 650-654 (5 pages)

Online Publication Date: July 18, 2006

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In this note a simple and sometimes practical method is devised with which the average speed and the cruising altitude of an aircraft in flight can be computed from a window seat inside the aircraft. No knowledge of the mechanical structure of the vehicle is assumed. Rather, either two separate time measurements or a time and a length measurement are used allowing one to construct sets of similar triangles. These triangles can then be used to derive the formulas for speed and altitude. This method can also be used to determine the average speed of moving ground vehicles such as trains and buses.

An Affirmative Action Graph

D. J. Newman

SIAM Rev. 33, pp. 655-655 (1 page)

Online Publication Date: July 18, 2006

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Abstract Unavailable

Inequality of the AGM and the Logarithmic Mean

B. C. Carlson and M. Vuorinen

SIAM Rev. 33, pp. 655-655 (1 page) | Cited 1 time

Online Publication Date: July 18, 2006

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A Linear Integro-Differential Equation

John Melville

SIAM Rev. 33, pp. 655-656 (2 pages)

Online Publication Date: July 18, 2006

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Abstract Unavailable

A Finite Part Integral

B. Bertram and O. G. Ruehr

SIAM Rev. 33, pp. 656-656 (1 page)

Online Publication Date: July 18, 2006

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Approximation for the Location of the Center of a Disk

M. L. Glasser and J. Koplowitz

SIAM Rev. 33, pp. 657-657 (1 page)

Online Publication Date: July 18, 2006

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Simultaneous Functional Equations (Paul Schweitzer)

Wolfgang Berndt

SIAM Rev. 33, pp. 657-658 (2 pages)

Online Publication Date: July 18, 2006

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Exponentially Windowed Estimates of a Periodically Sampled Time-Series, and Its First and Second Derivatives Using Quadratic Regression

Ken Lever

SIAM Rev. 33, pp. 658-661 (4 pages)

Online Publication Date: July 18, 2006

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Orthogonal Matrices and the Matrix Exponential (Dennis S. Bernstein)

William C. Waterhouse

SIAM Rev. 33, pp. 661-662 (2 pages)

Online Publication Date: July 18, 2006

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The Mathematics of Great Amateurs (Julian Lowell Coolidge)

Peter Braunfeld

SIAM Rev. 33, pp. 663-664 (2 pages)

Online Publication Date: July 18, 2006

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An Introduction to Dynamical Systems (D. K. Arrowsmith and C. M. Place)

Kenneth R. Meyer

SIAM Rev. 33, pp. 664-664 (1 page)

Online Publication Date: July 18, 2006

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Pearls in Graph Theory: A Comprehensive Introduction (N. Hartsfield and G. Ringel)

John S. Maybee

SIAM Rev. 33, pp. 664-665 (2 pages)

Online Publication Date: July 18, 2006

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Chaos in Systems with Noise (Tomasz Kapitaniak)

R. S. MacKay

SIAM Rev. 33, pp. 666-666 (1 page)

Online Publication Date: July 18, 2006

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Chaotic Dynamics: An Introduction (Gregory Baker and Jerry Gollub)

Peter J. Bryant

SIAM Rev. 33, pp. 666-668 (3 pages)

Online Publication Date: July 18, 2006

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Measure, Topology, and Fractal Geometry (Gerald A. Edgar)

Robert L. Devaney

SIAM Rev. 33, pp. 668-669 (2 pages) | Cited 1 time

Online Publication Date: July 18, 2006

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Ordinary Differential Equations: An Introduction to Nonlinear Analysis (Herbert Amann)

Robert W. Easton

SIAM Rev. 33, pp. 669-670 (2 pages)

Online Publication Date: July 18, 2006

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A Course in Mathematics for Students of Physics. Volume 2 (Paul Bamberg and Shlomo Sternberg)

Roger Waxler

SIAM Rev. 33, pp. 670-671 (2 pages)

Online Publication Date: July 18, 2006

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Optimization of Stochastic Systems: Topics in Discrete-Time Dynamics (Masanao Aoki)

Tze Leung Lai

SIAM Rev. 33, pp. 671-672 (2 pages)

Online Publication Date: July 18, 2006

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Asymptotic Modeling of Atmospheric Flows (R. Zeytounian)

Huijun Yang

SIAM Rev. 33, pp. 672-673 (2 pages)

Online Publication Date: July 18, 2006

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The Physics of Fluid Turbulence (W. D. McComb)

James Glimm

SIAM Rev. 33, pp. 673-674 (2 pages)

Online Publication Date: July 18, 2006

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General Relativity. An Introduction to the Theory of the Gravitational Field (Hans Stephani)

Jorge Pullin

SIAM Rev. 33, pp. 674-675 (2 pages)

Online Publication Date: July 18, 2006

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Numerical Continuation Methods, An Introduction (Eugene Allgower and Kurt Georg)

Romesh Saigal

SIAM Rev. 33, pp. 675-675 (1 page)

Online Publication Date: July 18, 2006

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Semiconductor Equations (P. A. Markowich, C. A. Ringhofer, and C. Schmeiser)

Carl L. Gardner

SIAM Rev. 33, pp. 675-677 (3 pages)

Online Publication Date: July 18, 2006

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Statistical Spectral Analysis: A Nonprobabilistic Theory (William A. Gardner)

Melvin J. Hinich

SIAM Rev. 33, pp. 677-678 (2 pages)

Online Publication Date: July 18, 2006

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Kinematic Geometry of Mechanisms (K. H. Hunt)

Joseph Duffy

SIAM Rev. 33, pp. 678-679 (2 pages)

Online Publication Date: July 18, 2006

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An Introduction to the History of Structural Mechanics, Part I: Statics and Resistance of Solids, Part II: Vaulted Structures and Elastic Systems (Edoardo Benvenuto)

W. R. Spillers

SIAM Rev. 33, pp. 679-680 (2 pages)

Online Publication Date: July 18, 2006

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Multilevel Adaptive Methods for Partial Differential Equations (Stephen F. McCormick)

Alan Weiser

SIAM Rev. 33, pp. 680-681 (2 pages)

Online Publication Date: July 18, 2006

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Abstract Unavailable

Mathematical Modelling. A Tool for Problem Solving in Engineering, Physical, Biological and Social Sciences (D. N. P. Murthy, N. W. Page, and E. Y. Rodin)

Arthur Sherman

SIAM Rev. 33, pp. 681-682 (2 pages)

Online Publication Date: July 18, 2006

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Electro-Diffusion of Ions (Isaak Rubinstein)

Joseph W. Jerome

SIAM Rev. 33, pp. 682-684 (3 pages)

Online Publication Date: July 18, 2006

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Abstract Unavailable

New Computer Methods for Global Optimization (H. Ratschek and J. Rokne)

Faiz Al-Khayyal and Panos Pardalos

SIAM Rev. 33, pp. 684-686 (3 pages)

Online Publication Date: July 18, 2006

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Adaptive Markov Control Processes (D. Hernandez-Lerma)

Gerhard Hübner

SIAM Rev. 33, pp. 686-687 (2 pages)

Online Publication Date: July 18, 2006

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Parameter Estimation in Ecology: The Link between Data and Models (O. Richter and D. Söndgerath)

Philip M. Dixon

SIAM Rev. 33, pp. 687-688 (2 pages)

Online Publication Date: July 18, 2006

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Aspects of Risk Theory (Jan Grandell)

Matti Ruohonen

SIAM Rev. 33, pp. 688-689 (2 pages)

Online Publication Date: July 18, 2006

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New Members

SIAM Rev. 33, pp. 690-692 (3 pages)

Online Publication Date: July 18, 2006

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Report of the Treasurer for the Year Ended December 31, 1990

SIAM Rev. 33, pp. 693-694 (2 pages)

Online Publication Date: July 18, 2006

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