Here, we will only report on the influence of window length on chord recognition rate, since preliminary experiments using different window types (i.e., Hanning, Hamming, Kaiser, and Blackman) had showed that no significant difference in performance is observed for any of the investigated features, i.e., STD, RC, and HRC.
A series of tests were carried out by using the verified finite element model to measure the SCF of circular chord and square braces K-joints with a reasonable range of three important parameters, i.e. β ratio of brace side length to chord diameter), 2γ ratio of chord diameter to chord thickness), τ ratio of brace thickness to chord thickness).
Far-field noise measurements have been taken at a single observer location and with two perpendicular microphone arrays in an anechoic wind tunnel at Reynolds numbers of Rec= 9.2×104 1.6×105, based on chord, and for a variety of airfoil aspect ratios (length to chord ratio of L/C= 0.2 2, corresponding to length to thickness ratio of L/T= 1.7 16.7).
Chapters 10 and 11 of the first book of the Almagest deal with the construction of a table of chords, in which the length of a chord in a circle is given as a function of the central angle that subtends it, for angles ranging from 0° to 180° at intervals of one-half degree.
For instance, Ptolemy's table of the lengths of chords in a circle is the earliest surviving table of a trigonometric function.
The camber of the mid wing is calculated as the perpendicular distance from the chord (wrist P V t [pt4 13] to the point P V i [pt 15] divided by the length of the chord.
To compute the various parts of the triangle, one has to find the length of each chord as a function of the central angle that subtends it or, equivalently, the length of a chord as a function of the corresponding arc width.
In his formula "technique of intersecting circles", he created an approximation of the arc of a circle s given the diameter d, sagita v, and length of the chord c subtending the arc, the length of which he approximated as s = c + 2v2/d.
Claw curvature radii were calculated for both inner and outer curvature from the angle of curvature and the length of the chord created by the line drawn from claw base to tip.
All individuals were weighed (in g) and standard body measurements were taken (in mm): length of wing chord, bill, culmen, seventh primary, tail and tarsus.
DOI: http://dx.doi.org/10.7554/eLife.00699.007 In experiment 3, the length of each chord in the SFG stimulus was halved to 25 ms, thereby reducing the corresponding durations of the figure and the stimulus.
