2014年1月16日 Nature

nero1981

2014年1月16日 Nature5 N7 d, w( N' h' U
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Northern bald ibises flying in V formation during a human-led migratory flight. Some bird species have refined their flying skills to the extent that they can fly in near-perfect V, but why they adopt such a tactic has been a matter of conjecture. One suggestion is that by flying in a V the birds are able to minimize energy costs, and now an analysis of data captured from free-flying migratory ibises suggests that there are energetic benefits. The data also reveal a sophisticated and dynamic process of in-flight control. Birds in the V phase their wing-beats to path-match, allowing a trailing bird to exploit the aerodynamic upwash from the bird in front. A bird flying directly behind, however, flaps with opposite phasing in order to minimize the detrimental downwash from the leader’s wings. All this must require the birds to have developed a range of phasing strategies to cope with the dynamic wakes produced by flapping wings. Cover: Markus Unsöld.$ U! a, H% r. h1 n% H9 ?
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ljs

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2012luhui

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tty

多谢多谢啊
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redmaple

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wbj1983

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sysuhoo

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一群小水滴

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youngyoungzhao

久违了，终于又回到这个网站了

ivangile

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