Nyhedsanalysen
Kolibrien i vindtunnellen
National Geograhic har lavet et fænomenalt indtagende visuelt traktement med kolibrien som hovedperson. Hvem der bare havde de vinger. 100 slag i sekundet er da noget, og du har formentlig aldrig set en kolibri i en vindtunnel før.
A digital particle image of Rufous hummingbird hovering is seen in this undated handout. Hummingbirds hover by flapping their wings a bit like insects and a bit like other birds, and now a super-fast camera has made an image of the technique, scientists reported, June 22, 2005. Researchers used digital particle imaging velocimetry (DPIV), to study the aerodynamics of hummingbird hovering. DPIV couples a digital camera that uses a laser light source and a computer to track circulating microscopic oil droplets seeded in the air. The system allows scientists to follow the movement of individual particles when air is circulated by the bird's wings. FOR EDITORIAL USE ONLY REUTERS/Dean Briggins/U.S. Fish and Wildlife Service/Handout
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