Estimating bird flight height using 3‐D photogrammetry

2021 ◽  
Author(s):  
N. D. Prinsloo ◽  
M. Postma ◽  
P. G. Ryan ◽  
M. Coetzee ◽  
P. J. N. de Bruyn
Keyword(s):  
Bird Flight ◽  
Flight Height

Study on the Correlations between the Flight Height and the Two-Legged and One-Legged Take-Off Power in the "Division A" Female Volleyball Players

2010 ◽  
Vol 19 (3-4) ◽  
Author(s):  
Gloria Raţă ◽  
Florin Grapă ◽  
Bogdan Raţă ◽  
Lăcrămioara Manole ◽  
Dana Ciocan
Keyword(s):  
Flight Height ◽  
Volleyball Players

Fifteen Testable Predictions about Bird Flight

Oikos ◽  
1978 ◽  
Vol 30 (2) ◽  
pp. 165 ◽  
Author(s):  
Colin J. Pennycuick
Keyword(s):  
Bird Flight

scholarly journals Reply to Brougham and Brusatte: Overall anatomy confirms posture and flight model offers insight into the evolution of bird flight

2010 ◽  
Vol 107 (40) ◽  
pp. E156-E156 ◽  
Author(s):  
D. E. Alexander ◽  
E. Gong ◽  
L. D. Martin ◽  
D. A. Burnham ◽  
A. R. Falk
Keyword(s):  
Bird Flight ◽  
Flight Model ◽  
Insight Into

Comparative power curves in bird flight

Nature ◽  
2003 ◽  
Vol 421 (6921) ◽  
pp. 363-366 ◽  
Author(s):  
B. W. Tobalske ◽  
T. L. Hedrick ◽  
K. P. Dial ◽  
A. A. Biewener
Keyword(s):  
Bird Flight ◽  
Power Curves

scholarly journals Influence of spray mixture volume and flight height on herbicide deposition in aerial applications on pastures

2014 ◽  
Vol 32 (1) ◽  
pp. 227-232 ◽  
Author(s):  
M.A.P. Oliveira ◽  
U.R. Antuniassi ◽  
E.D. Velini ◽  
R.B. Oliveira ◽  
J.F. Salvador ◽  
...  
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
High Performance ◽  
Mineral Oil ◽  
Mato Grosso ◽  
Significant Difference ◽  
Flight Height ◽  
Mixture Volume ◽  
Pasture Area ◽  
Experimental Plots

The objective of the present study was to analyze the influence of spray mixture volume and flight height on herbicide deposition in aerial applications on pastures. The experimental plots were arranged in a pasture area in the district of Porto Esperidião (Mato Grosso, Brazil). In all of the treatments, the applications contained the herbicides aminopyralid and fluroxypyr (Dominum) at the dose of 2.5 L c.p. ha-1, including the adjuvant mineral oil (Joint Oil) at the dose of 1.0 L and a tracer to determine the deposition by high-performance liquid chromatography (HPLC) (rhodamine at a concentration of 0.6%). The experiment consisted of nine treatments that comprised the combinations of three spray volumes (20, 30 and 50 L ha-1) and three flight heights (10, 30 and 40 m). The results showed that, on average, there was a tendency for larger deposits for the smallest flight heights, with a significant difference between the heights of 10 and 40 m. There was no significant difference among the deposits obtained with the different spray mixture volumes.

Aeronautics of Bird Flight

The Condor ◽  
1930 ◽  
Vol 32 (6) ◽  
pp. 269-287 ◽  
Author(s):  
Sterling Bunnell
Keyword(s):  
Bird Flight

The Mechanics of Bird-Flight

Science ◽  
1881 ◽  
Vol os-2 (29) ◽  
pp. 20-21
Keyword(s):  
Bird Flight

A new low-turbulence wind tunnel for bird flight experiments at Lund University, Sweden

1997 ◽  
Vol 200 (10) ◽  
pp. 1441-1449 ◽  
Author(s):  
C J Pennycuick ◽  
T Alerstam ◽  
A Hedenström
Keyword(s):  
Wind Speed ◽  
Wind Tunnel ◽  
Test Section ◽  
Safety Net ◽  
Turbulence Level ◽  
Bird Flight ◽  
Contraction Ratio ◽  
Unrestricted Access ◽  
Side Walls ◽  
Air Speed

A new wind tunnel for experiments on bird flight was completed at Lund University, Sweden, in September 1994. It is a closed-circuit design, with a settling section containing five screens and a contraction ratio of 12.25. The test section is octagonal, 1.20 m wide by 1.08 m high. The first 1.2 m of its length is enclosed by acrylic walls, and the last 0.5 m is open, giving unrestricted access. Experiments can be carried out in both the open and closed parts, and comparison between them can potentially be used to measure the lift effect correction. The fan is driven by an a.c. motor with a variable-frequency power supply, allowing the wind speed to be varied continuously from 0 to 38 m s-1. The whole machine can be tilted to give up to 8 ° descent and 6 ° climb. A pitot-static survey in the test section showed that the air speed was within ±1.3 % of the mean at 116 out of 119 sample points, exceeding this deviation at only three points at the edges. A hot-wire anemometer survey showed that the turbulence level in the closed part of the test section was below 0.04 % of the wind speed throughout most of the closed part of the test section, rising to approximately 0.06 % in the middle of the open part. No residual rotation from the fan could be detected in the test section. No decrease in wind speed was detectable beyond 3 cm from the side walls of the closed part, and turbulence was minimal beyond 10 cm from the walls. The installation of a safety net at the entrance to the test section increased the turbulence level by a factor of at least 30, to 1.2 % longitudinally and 1.0 % transversely.

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