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Offline kullatiro

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[/youtube]

 Mosquitoes Fly in Rain Thanks to
Low Mass

 ScienceDaily (June 4, 2012) — The
mosquito is possibly summer's
biggest nuisance. Sprays, pesticides,
citronella candles, bug zappers --
nothing seems to totally deter the
blood-sucking insect. And neither can
rain apparently.

 Even though a single raindrop can
weigh 50 times more than a
mosquito, the insect is still able to fly
through a downpour.
Georgia Tech researchers used high-
speed videography to determine how
this is possible. They found the
mosquito's strong exoskeleton and
low mass render it impervious to
falling raindrops.
The research team, led by Assistant
Professor of Mechanical Engineering
David Hu and his doctoral student
Andrew Dickerson, found that
mosquitoes receive low impact forces
from raindrops because the mass of
mosquitoes causes raindrops to lose
little momentum upon impact. The
results of the research will appear in
the June 4 issue of the Proceedings
of the National Academy of
Sciences.
"The most surprising part of this
project was seeing the robustness this
small flyer has in the rain," Dickerson
said. "If you were to scale up the
impact to human size, we would not
survive. It would be like standing in
the road and getting hit by a car."
What the researchers learned about
mosquito flight could be used to
enhance the design and features of
micro-airborne vehicles, which are
increasingly being used by law
enforcement and the military in
surveillance and search-and-rescue
operations.
To study how mosquitoes fly in the
rain, the research team constructed a
flight arena consisting of a small
acrylic cage covered with mesh to
contain the mosquitoes but permit
entry of water drops. They used a
water jet to simulate rain stream
velocity and observed six mosquitoes
flying into the stream. All the
mosquitoes survived the collision.
"The collision force must equal the
resistance applied by the insect," Hu
said. "Mosquitoes don't resist at all,
but simply go with the flow."
The team also filmed free-flying
mosquitoes that were subjected to
rain drops. They found that upon
impact the mosquito is adhered to
the front of the drop for up to 20
body lengths.
"To survive, the mosquito must
eventually separate from the front of
the drop," Hu said. "The mosquito
accomplishes this by using its long
legs and wings, whose drag forces act
to rotate the mosquito off the point of
contact. This is necessary, otherwise
the mosquito will be thrown into the
ground at the speed of a falling
raindrop."
To view a video on this research, click
here: https://www.youtube.com/
watch?
v=LQ88ny09ruM&feature=youtu.be




source:
http://www.sciencedaily.com/releases/2012/06/120604155558.htm


jadi tetap tutup pintu rumah bila hujan karena nyamuk masih bisa terbang masuk ke rumah meskipun hujan deras mendera.
« Last Edit: 05 June 2012, 10:09:32 AM by daimond »