Results 271 to 280 of about 3,765,058 (318)

Association of Resistance With Frailty Among Components of the FRAIL Scale in Geriatric Trauma Patients. [PDF]

Cureus
Hersh BL, Lee K, Frank K, Moglia T, Erickson P, Frank B.   +5 more
europepmc   +1 more source

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The spectrum of animal flight: insects to pterosaurs

Progress in Aerospace Sciences, 2000
Abstract This paper summarises available data on the geometry and flight characteristics of all types of winged animals, including insects, gliders, birds, bats and pterosaurs. Helicopter momentum stream tube theory has been adapted for the estimation of the upper size limits for flying animals in gliding, hovering, solitary and formation flight, and
R. Templin
exaly   +3 more sources

On the aerodynamics of animal flight in ground effect

Philosophical Transactions of the Royal Society B: Biological Sciences, 1991
Abstract Flight in ground effect above a flat, smooth surface may give an animal considerable performance advantages, including a reduction in cost of transport of up to 15%, and a reduction in mechanical flight power of as much as 35%, compared with values for flight out of ground effect.
Jeremy M V Rayner
exaly   +3 more sources

8. Animal Flight

1975
James Lighthill
exaly   +3 more sources

Advances in animal flight studies1

Canadian Journal of Zoology, 2015
(Uploaded by Plazi for the Bat Literature Project) No abstract provided.
S. Swartz
semanticscholar   +3 more sources

The fascination of animal flight

Trends in Ecology & Evolution, 2005
The ability to fly in animals is one of the masterpieces of evolution. The ecological advantages include a rapid escape mechanism, and rapid and relatively (energetically) cheap transport. Even though humans have been interested in bird flight for centuries, the interest remains at a high level and modern research is steadily revealing new findings ...
A. Hedenström
semanticscholar   +2 more sources

Aerodynamic Aspects of Animal Flight

, 1975
A lecture or a course of lectures on ‘Aircraft’ would put approximately equal emphasis on aerodynamic, structural and power-plant aspects; whereas lectures on ‘Aerodynamics of Aircraft’ would concentrate principally on aerodynamic matters while referring to just the basic elements of what limitations are imposed by structural and power-plant ...
J. Lighthill
semanticscholar   +2 more sources

Biological and Aerodynamical Problems of Animal Flight

The Journal of the Royal Aeronautical Society, 1942
The recurring discussions regarding human flapping flight (if possible, by muscle-power!) have done more harm than good, because they distract attention from other more important subjects.For example, the heed for the faster and larger flying creatures (such as large birds) and for high-speed aeroplanes to reduce speed when necessary, without ...
E. Holst, D. Kuchemann
semanticscholar   +2 more sources

A vortex theory of animal flight. Part 2. The forward flight of birds

Journal of Fluid Mechanics, 1979
The vortex wake of a bird in steady forward flight is modelled by a chain of elliptical vortex rings, each generated by a single downstroke. The shape and inclination of each ring are determined by the downstroke geometry, and the size of each ring by the wing circulation; the momentum of the ring must overcome parasitic and profile drags and the bird ...
J. Rayner
semanticscholar   +2 more sources