Quantum

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Contents of the July/August 1997 issue of Quantum


Feature articles

Colder Means Slower

by Henry D. Schreiber

The elegant and wide-ranging Arrhenius equation tells us how much slower.


All Sorts of Sorting

by P. Blekher and M. Kelbert

An introduction to the comparatively young science of pattern recognition theory—specifically, a look at various classification methods.


Can You See the Magnetic Field?

by Alexander Mitrofanov

How to use your TV in a new and enlightening way.


Seeing is Believing

by Daniel J. Davidson and Louis H. Kauffman

Visual proofs of the Pythagorean theorem.

Art by Daniel J. Davidson

Departments

Kaleidoscope: The Complete Quadrilateral

by I. F. Sharygin

It’s a figure formed by four straight lines on the plane none of which are parallel and no three of which pass through the same point. This article examines some interesting properties of complete quadrilaterals.


Physics Contest: A Physics Soufflé

by Arthur Eisenkraft and Larry D. Kirkpatrick

In physics as in cooking, you can have too much of a good thing. When is a piece of information crucial, and when can you get by without it?


Math Investigations: Counting Problems in Finite Groups

by George Berzsenyi

In his last column for Quantum, Dr. Berzsenyi presents a problem from the Research Experiences for Undergraduates program.


At the Blackboard I: Whirlwinds over the Runway

by Albert Stasenko

A look at the vortices created by large planes near the ground.


Cowculations: Out Standing in the Field

by Dr. Mu

How to divvy up the championship purse in a storm-shortened season of baseball: the Holsteins vs. the Jerseys.


At the Blackboard II: Remarkable Limits

by M. Crane and A. Nudelman

Two sequences created by two different types of means (arithmetic, geometric, or harmonic)—repeatedly taking the means of the means obtained—converge to a common limit. This article presents various ways of finding that limit.


Fundamentals: Internal Energy and Heat

by Alexey Chernoutsan

Why does “Q” appear in the reference tables and not “delta U”?


Feedback: Caution: No Air Brakes on This Planet!

by David P. Stern

A response to “A Planetary Air Brake” (Quantum, March/April 1997).


How Do You Figure?: Challenges in Physics and Math


Brainteasers: Just for the Fun of It!

Check out this sample!


Happenings

The Quantum Bulletin Board.


Crisscross Science

Scientific crossword puzzle.


Answers, Hints & Solutions


Index (1996–97)


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