ASTRONOMY: 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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Comet P/Swift-Tuttle was observed in the light of H2O, CO+ and continuum with the 2-m telescope of the Bulgarian National Astronomical Observatory (BNAO) on Nov. 25, 1992. We present column density maps of the H2O and CO+ ions and a map of the product of filling factor, geometrical albedo, and phase function. The H2O ions are more concentrated toward the nucleus than CO+. The ion distributions ...
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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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The Springer-Praxis Popular Astronomy programme covers the latest observations, techniques and discoveries in astronomy, astrophysics and cosmology, selecting key topics designed to fire the imagination of keen astronomers everywhere. Many of the topics selected for titles in this programme are refreshingly new, and away from the accepted mainstream of titles published in this area. Topics inc...
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ژورنال
عنوان ژورنال: Science
سال: 1880
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.os-1.26.305