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januari 02, 2004
Två Nature-artiklar
Secrets of stone skimming revealed:
Want to skim the perfect stone? A team of French researchers have worked out how, using their very own stone-skipping machine.
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To achieve the maximum number of rebounds, the angle between a spinning stone and the water should be about 20 degrees1, advises [Christophe] Clanet: "This is the magic angle."
Se även
The physics of stone skipping (PDF) av Lydéric Bocquet.
Kasta smörgås (tyvärr är den refererade Discoverartikeln inte tillgänglig längre).
Songbird duets resonate to beat
The synchronized rhythms of South American ovenbirds may be driven by simple physics, say researchers, rather than deep-rooted musical talent.
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The male's song 'drives' the pattern of the female song, the researchers think, rather like a pendulum that is set swinging by vibration of the beam from which it hangs. But the songs differ from a simple pendulum, or linear oscillator, that swings with a single, steady rhythm.
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In theory, a typical sequence might go from perfectly synchronised notes of 1:1 to 2:3, 1:2, 2:5, 1:3, and so on all the way to 1:5. This is just what seems to happen in the real duets as the male speeds up his song.
Se även Deconstructing Birdsong
Posted by hakank at januari 2, 2004 10:48 FM Posted to Komplexitet/emergens