Of hummingbirds and helicopters: Hovering costs, competitive ability, and foraging strategies [PDF]
, 2004 Wing morphology and flight kinematics profoundly influence foraging costs and the overall behavioral ecology of hummingbirds. By analogy with helicopters, previous energetic studies have applied the momentum theory of aircraft propellers to estimate ...
Altshuler, Douglas L. +2 more
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Convergent genomic signatures of flight loss in birds suggest a switch of main fuel
Nature Communications, 2019 Flight loss has occurred numerous times in bird evolution. Here, the authors examine convergent sites in the exonic and intronic sequences of 48 bird genomes, finding amino-acid changes in two genes, ATGL and ACOT7, with potential implications for a ...
Shengkai Pan +12 more
doaj +1 more source
Wave-Slope Soaring of the Brown Pelican [PDF]
, 2019 We theoretically assess the energy savings associated with wave-slope soaring of the brown pelican over near-shoaling ocean surface waves. The steady, constant altitude flight of a pelican is analyzed as a control.
Stokes, Ian
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Combining Bird Flight Algorithm and CUL Heuristic Algorithm for On-Demand Two-Dimensional Non-Guilline Cutting Problem [PDF]
چشمانداز مدیریت صنعتی, 2011 In this paper, the problem of two-dimensional shear is investigated with demand. In this case, by cutting large rectangular sheets, the smaller rectangles needed should be produced in a way that minimizes waste or the number of sheets consumed while ...
Faezeh Asadian Ardakani +1 more
doaj
V-like formations in flocks of artificial birds
, 2007 We consider flocks of artificial birds and study the emergence of V-like formations during flight. We introduce a small set of fully distributed positioning rules to guide the birds' movements and demonstrate, by means of simulations, that they tend to ...
Andre Nathan +4 more
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An investigation into the detection of latent marks on the feathers and eggs of birds of prey [PDF]
, 2014 There are numerous enhancement techniques (physical and chemical) which have been developed for the successful visualisation of latent fingermarks. Nonetheless, problems arise when latent fingermarks require enhancement on difficult surfaces such as ...
Farrugia, Kevin J. +2 more
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Quantifying nocturnal bird migration using acoustics: opportunities and challenges
Remote Sensing in Ecology and ConservationAcoustic recordings have emerged as a promising tool to monitor nocturnal bird migration, as it can uniquely provide species‐level detection of migratory movements under the darkness of the night sky.
Siméon Béasse +3 more
doaj +1 more source
Battery-operated Independent Radiation Detector Data Report from Exploration Flight Test 1 [PDF]
, 2015 Citation: Bahadori AA, Semones EJ, Gaza R, Kroupa M, Rios RR, Stoffle NN, Campbell-Ricketts T, Pinsky LS, and Turecek D 2015 Battery-operated Independent Radiation Detector Data Report from Exploration Flight Test 1 NASA/TP-2015-218575 NASA Johnson Space
Bahadori, Amir A. +8 more
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Ontogeny of aerial righting and wing flapping in juvenile birds [PDF]
, 2014 Mechanisms of aerial righting in juvenile Chukar Partridge (Alectoris chukar) were studied from hatching through 14 days post hatching (dph). Asymmetric movements of the wings were used from 1 to 8 dph to effect progressively more successful righting ...
Cam, Sharlene +4 more
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