Display of resonance properties of the rock massifs in microtremors

2010 ◽  
pp. 301-304
Keyword(s):  
Resonance Properties

Resonance Properties of a Flat Waveguide with a Superconducting Wall

2001 ◽  
Vol 56 (2) ◽  
pp. 6
Author(s):  
Vladimir Pavlovich Modenov ◽  
Valerii Vyacheslavovich Konushenko
Keyword(s):  
Resonance Properties

On Resonance Properties of a 2D-Periodic Screen with Beyond-Cutoff Holes

2008 ◽  
Vol 67 (17) ◽  
pp. 1515-1529
Author(s):  
Andrei Olegovich Perov ◽  
A. A. Kirilenko
Keyword(s):  
Resonance Properties

Influence of interlayer magnetostatic coupling on the ferromagnetic resonance properties of lithographically patterned ferromagnetic trilayers

2008 ◽  
Vol 92 (16) ◽  
pp. 161903 ◽  
Author(s):  
Y. Nozaki ◽  
K. Tateishi ◽  
S. Taharazako ◽  
S. Yoshimura ◽  
K. Matsuyama
Keyword(s):  
Ferromagnetic Resonance ◽  
Resonance Properties ◽  
Magnetostatic Coupling

The effect of an interface boundary layer on the resonance properties of a buried structure

2004 ◽  
Vol 33 (2) ◽  
pp. 227-247 ◽  
Author(s):  
Y. S. Karinski ◽  
V. V. Shershnev ◽  
D. Z. Yankelevsky
Keyword(s):  
Boundary Layer ◽  
Interface Boundary ◽  
Resonance Properties

Analytical representation of hydrophone complex frequency response

2021 ◽  
pp. 16-20
Author(s):  
Alexander E. Isaev
Keyword(s):  
Frequency Response ◽  
Complex Variable ◽  
Active Element ◽  
Analytical Representation ◽  
Complex Frequency ◽  
Minimum Phase ◽  
Experimental Frequency ◽  
Resonance Properties ◽  
Fractional Rational Function ◽  
Sound Diffraction

The problem of analytical representation of hydrophone complex frequency response based on a model consisting of an advance line and a minimum-phase part, which describing the effect of sound diffraction and resonance properties of an active element, is considered. Algorithms are proposed for approximating the hydrophone complex frequency response by a fractional-rational function of the complex variable according to the data of the hydrophone amplitude-frequency and/or phasefrequency responses. Examples of the application of these algorithms for processing experimental frequency characteristics of hydrophones are given.

Kinematics of birdsong: functional correlation of cranial movements and acoustic features in sparrows

1993 ◽  
Vol 182 (1) ◽  
pp. 147-171 ◽  
Author(s):  
M. W. Westneat ◽  
J. H. Long ◽  
W. Hoese ◽  
S. Nowicki
Keyword(s):  
Vocal Tract ◽  
Active Role ◽  
Acoustic Properties ◽  
Zonotrichia Albicollis ◽  
Low Frequencies ◽  
Acoustic Frequency ◽  
Mean Frequency ◽  
Singing Behavior ◽  
Resonance Properties ◽  
Melospiza Georgiana

The movements of the head and beak of songbirds may play a functional role in vocal production by influencing the acoustic properties of songs. We investigated this possibility by synchronously measuring the acoustic frequency and amplitude and the kinematics (beak gape and head angle) of singing behavior in the white-throated sparrow (Zonotrichia albicollis) and the swamp sparrow (Melospiza georgiana). These birds are closely related emberizine sparrows, but their songs differ radically in frequency and amplitude structure. We found that the acoustic frequencies of notes in a song have a consistent, positive correlation with beak gape in both species. Beak gape increased significantly with increasing frequency during the first two notes in Z. albicollis song, with a mean frequency for note 1 of 3 kHz corresponding to a gape of 0.4 cm (a 15 degrees gape angle) and a mean frequency for note 2 of 4 kHz corresponding to a gape of 0.7 cm (a 30 degrees gape angle). The relationship between gape and frequency for the upswept third note in Z. albicollis also was significant. In M. georgiana, low frequencies of 3 kHz corresponding to beak gapes of 0.2-0.3 cm (a 10–15 degrees break angle), whereas frequencies of 7–8 kHz were associated with flaring of the beak to over 1 cm (a beak angle greater than 50 degrees). Beak gape and song amplitude are poorly correlated in both species. We conclude that cranial kinematics, particularly beak movements, influence the resonance properties of the vocal tract by varying its physical dimensions and thus play an active role in the production of birdsong.

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