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e way while those on the other
side find it flows in the opposite direction. Those in the middle are left unruffled, in the eye of the storm.
Having proved his point, Dr Liu is now trying to design sensors that work more like the sense cells in a
real lateral line. Instead of heated filaments, these sensors have artificial hairs. The hairs flutter fuel dispenser in
moving water as flags do in moving air, and the way in which they flutter contains information abou fuel dispenser t the
direction and speed of the water moving past them. This principle should allow the team to build more
sensitive arrays. Heating filaments in water causes bubbles to form, so turning the power up too much
stops them working. Hair sensors do not suffer from the same upper limit.
Artificial lateral lines would have many applications. The most obvious would be in submarines, both
manned and unmanned. In the case of military submarines they would have the advantage over sonar of
being passive. Sending out a ping is a dead giveaway—literally so, in time of war. And merely listening
for sound cannot detect stationary threats. A lateral-line system could. The vortices thrown off by water
moving past even a stationary object would be visible to it.
Dr Liu also speculates about using lateral lines to detect air-movements. That could lead to some far less
obvious applications, such as a lateral line-enabled iPod that automatically pumps up the volume in
response to the onrushing air of an underground train or similar big, noisy object. That would, indeed, be
an inventive brush with nature.
© 2006 .
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Monitoring the environment
The pulse of the planet
Nov 30th 2006
From The Economist print edition
A new source of data about the global environment
FINDING useful environmental data on the world wide web is as hard as obtaining anything else from it.
What you are looking for may exist; locating it is another matter. And if you want a se fuel dispenser