منابع مشابه
Wingbeat frequency of barn swallows and house martins: a comparison between free flight and wind tunnel experiments.
The flight paths and wingbeat patterns of 39 barn swallows (Hirundo rustica) and 26 house martins (Delichon urbica) were recorded by tracking radar during the spring migration. Depending mostly on flight angle, hirundines performed anything from continuous flapping flight during climbing to single pulse-like wing beats during descent. Unlike most other passerines, hirundines rarely showed regul...
متن کاملFlexibility in flight behaviour of barn swallows (Hirundo rustica) and house martins (Delichon urbica) tested in a wind tunnel.
The flight behaviour of barn swallows (Hirundo rustica) and house martins (Delichon urbica) was tested in a wind tunnel at 15 combinations of flight angles and speeds. In contrast to that of most other small passerines, the intermittent flight of hirundines rarely consists of regular patterns of flapping and rest phases. To vary mechanical power output, both species used intermittent flight, co...
متن کامل217-223 Martins LAJP 1428
1 Department of Clinical and Toxicological Analysis, University of Alfenas-MG, Av. Gabriel Monteiro da Silva, 714, Alfenas, MG, Brazil, 37130.000 2 Laboratory of Industrial Hygiene and Toxicology, University of Brescia, P.le Spedali Civili, 1, 25100, Brescia, Italy 3 Department of Clinical and Toxicological Analysis, Faculty of Pharmaceutical Sciences, University of São Paulo, Av. Lineu Prestes...
متن کاملPurple Martins in Oak Woodlands
Purple martins are cavity-nesting swallows that once nested fairly widely in California’s oak woodlands but are now rare in that habitat. The old oaks of the Tehachapi Range (southern Sierra Nevada) may now host the last martins that nest in oak woodlands, with approximately 100-200 pairs or about 15 percent of the California population. In summer of 2000, we found 57 nests in 46 valley and blu...
متن کاملThe Ulm Sparrows 99 Ulm - Sparrows
In RoboCup-98, ULM-Sparrows team worked hard just to get both a simulation and a middle size robot team to work and to successfully participate in a major tournament. For this year, we were in a better position to start some more serious research work. Aside of improvements in the robot hardware and an extension of the vision processing capabilities, we implemented a more complete version of ou...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Blue Jay
سال: 1952
ISSN: 2562-5667,0006-5099
DOI: 10.29173/bluejay1386