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Monday, April 06, 2009

The Doppler Effect

The Doppler effect (or Doppler shift), named after Austrian physicist Christian Doppler who proposed it in 1842, is the change in frequency and wavelength of a wave for an observer moving relative to the source of the waves. It is commonly heard when a vehicle sounding a siren approaches, passes and recedes from an observer. The received frequency is increased (compared to the emitted frequency) during the approach, it is identical at the instant of passing by, and it is decreased during the recession. For waves that propagate in a medium, such as sound waves, the velocity of the observer and of the source are relative to the medium in which the waves are transmitted. The total Doppler effect may therefore result from motion of the source, motion of the observer, or motion of the medium. Each of these effects is analyzed separately. For waves which do not require a medium, such as light or gravity in special relativity, only the relative difference in velocity between the observer and the source needs to be considered.
http://en.wikipedia.org/wiki/Doppler_effect

There is an unfortunate optical illusion - a variant on the Doppler effect - that besets all frauds. It's unfortunate, because it has the effect of exacerbating the pecuniary losses that fraud victims endure, by unfairly leaving them, like many rape victims, irrationally ashamed of themselves. The Doppler principle we posit holds that as a victim approaches a swindler, he sees nothing but green lights. But as soon as he realizes that his money is gone, he spins around and beholds, as if by magic, bright red flags as far as the eye can see.
http://money.cnn.com/2009/03/31/news/newsmakers/parloff_dreier.fortune/index4.htm

Some people are smart but in the end lose everything. It's a state of mind.

Bill Cunningham Viewpoint

On the Street The Birth of Spring
http://www.nytimes.com/interactive/2009/04/03/fashion/20090405-street-feature/index.html#

Brilliant. I loved it. Thank you Bill.

Fareed Zakaria Viewpoint

Free At Last
http://www.newsweek.com/id/192479

Useful links:
www.fareedzakaria.com
www.mcdonough.com

Great essay.

Art Market Update

Pen and ink
http://www.economist.com/opinion/displayStory.cfm?story_id=13432496

Useful links:
www.ville-ge.ch/mah
www.frick.org
www.christies.com

Great review.

Plushmusic

Watch live classical, jazz and world performances from some of the world’s most exciting musicians via Plushmusic @ www.plushmusic.tv

Jim Davis Interview

Garfield's Fun Fest: Jim Davis interview
http://www.telegraph.co.uk/culture/film/starsandstories/5099241/Garfields-Fun-Fest-Jim-Davis-interview.html

Useful link:
www.garfield.com

Jim, keep on drawing.

Luke Johnson Viewpoint

Rekindle those risk-taking animal spirits
http://www.ft.com/cms/s/0/ef69109e-1e09-11de-830b-00144feabdc0,dwp_uuid=782015c4-f2e3-11dd-abe6-0000779fd2ac.html

As John Maynard Keynes put it: 'The thought of ultimate loss which overtakes pioneers, as experience undoubtedly tells us and them, is put aside as a healthy man puts aside the expectation of death.' Right now, too many would-be pioneers are worrying about dangers and not rewards. Fear has overwhelmed greed: the adventurous are on the retreat. Until we reverse this psychology, we shall never recover our economic momentum.
- Luke Johnson

Useful links:
www.lukejohnson.org
www.riskcapitalpartners.co.uk

Spot on.

Rare Blue Diamond

Rare Blue Diamond
http://www.msnbc.msn.com/id/21134540/vp/30029818#30029818

There will be buyers for the rare blue diamond in Hong Kong.