Put a little chaos in your life. Don't forget the 3-D glasses when you do.

The award-winning CHAOS DEMONSTRATIONS software program published by
Physics Academic Software has been expanded with new demonstrations of
chaotic events, including 13 three-dimensional animations that allow
viewers to follow the action with red-and-blue 3-D glasses.

Designed primarily for classroom lectures, museum exhibits, and as a study
tool for individuals, the package provides 22 demonstrations of "chaos"
found in nature, including chaotic patterns such as fractals. More than 30
parameters can be adjusted by the user, allowing thousands of chaotic
variations to unfold.

New demonstrations for version 2.0 include the Duffing oscillator and the
Rossler attractor. Also included are all the demonstrations from version
1.0, which won the 1990 Computers in Physics Award for best program in
chaos. The driven pendulum demonstration, for example, and the Van der Pol
equation are included from the original program. The first shows
complicated motions when different forces are applied to a simple harmonic
oscillator, such as a swinging pendulum, while the Van der Pol equation
has been used to model such events as the pulsating stars called Cephids.

Other new features for CHAOS DEMONSTRATIONS version 2.0 include the
following:

 Five new one-dimensional maps for sine, sine-square, cubic, tent, and
shift maps;

 Eight new deterministic fractals, including devil's staircase, Von Koch
island, and a fractal tree;

 Significantly improved calculation speed, accuracy, graph labels, and
sound quality;

 Enhanced "museum mode" operation and additional scripting features for
use as a lecture aid.

Despite their inherent beauty, such phenomena as clouds, snowflakes, or
water tumbling over a waterfall seem to defy clear rules of behavior. Yet
water over the dam is merely an example of chaotic behavior, and the shape
of a cloud is a fractal. They follow simple mathematical rules that are
examined by the program. The behavior of even simple systems soon becomes
complex, often appearing to become random or chaotic.

Instructors who have used the new version respond favorably. John
Mallinckrodt, California State Polytechnic University, says CHAOS
DEMONSTRATIONS "seems well-targeted, offers a reasonable amount of
interactivity, and has a clean, professional look." W. T. Sobol, Bowman
Gray School of Medicine, claims, "This is one of the best programs I have
evaluated for Physics Academic Software so far." And Joseph Harrison,
University of Alabama, Birmingham, comments, "Very nice package. Every
time I brought it up, I drew a crowd around my desk."

The program operates on IBM PC, XT, AT, and PS/2 personal computers with at
least 348K of RAM and CGA, HGA, MCGA, EGA, or VGA graphics. A math
coprocessor, mouse, and graphics-capable printer are recommended.

CHAOS DEMONSTRATIONS was created by Julien C. Sprott, professor of physics
at the University of Wisconsin, Madison, and by George Rowlands, reader of
theoretical physics at the University of Warwick, Coventry, England. The
program is part of a continuing series of educational software published
by Physics Academic Software, a publishing project of the American
Institute of Physics in cooperation with the American Physical Society and
the American Association of Physics Teachers.

The program is licensed for use on one machine for $69.95, plus $2.75 for
shipping and handling. Physics Academic Software offers a no-risk
guarantee a full refund is given for packages returned within 30 days.
Other software programs in chaos offered by Physics Academic Software
include CHAOS SIMULATIONS and CHAOTIC DYNAMICS WORKBENCH. Orders and
requests for a free catalog of all Physics Academic Software titles should
be directed to The Academic Software Library, Campus Box 8202, North
Carolina State University, Raleigh, NC 27695-8202. By telephone, call
800-955-TASL or 919-515-7447. The FAX number is 919-515-2682.

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