Swift's Comet
نویسندگان
چکیده
منابع مشابه
Swifts: A Guide to the Swifts and Treeswifts of the World. 2nd edition
possibility that the cowbird trapping was ineffectively implemented. Hall and Rothstein digress somewhat from local cowbird-control removals to potential landscape alternatives. Sorely overlooked in that treatment was a critical appraisal of broad-scale control options. In fact, data and analyses of several studies elsewhere in this volume suggest potential cowbird effects on host communities a...
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Gliding flight performance and wake topology of a common swift (Apus apus L.) were examined in a wind tunnel at speeds between 7 and 11 m s(-1). The tunnel was tilted to simulate descending flight at different sink speeds. The swift varied its wingspan, wing area and tail span over the speed range. Wingspan decreased linearly with speed, whereas tail span decreased in a nonlinear manner. For ea...
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Swifts are among the most aerodynamically refined gliding birds. However, the overlapping vanes and protruding shafts of their primary feathers make swift wings remarkably rough for their size. Wing roughness height is 1-2% of chord length on the upper surface--10,000 times rougher than sailplane wings. Sailplanes depend on extreme wing smoothness to increase the area of laminar flow on the win...
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On 20-21 May 2015, more than 150 people with an interest in core outcome sets (COS) gathered at the University of Calgary in Alberta, Canada for the fifth meeting of the COMET Initiative. This was the first annual COMET meeting in North America, and the COMET Management Group are grateful to Cochrane Canada for facilitating the meeting and an excellent joint session on the second day. As well a...
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In his inspiring book Ontogeny and Phylogeny (1977), the late Stephen J. Gould explained why develop mental biology and evolution, two essential domains of the life sciences, had diverged during the course of the twentieth century; both disciplines had to reach independently a platform of mutual understanding, a theoretical framework wherein concepts are understood and accepted by both parties....
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ژورنال
عنوان ژورنال: Nature
سال: 1879
ISSN: 0028-0836,1476-4687
DOI: 10.1038/020265b0