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Open Journal of Acoustics (OJA) is an international journal dedicated to the advancement of the study of acoustics. The goal of this journal is to provide a platform for scientists and academicians all over the world to promote, share, and discuss various new issues and developments in different areas of acoustics. Al…
Mohammad Al Zubi
The availability of ideal conditions like anechoic chamber to characterize some sound parameters, like sound intensity and sound power necessities the determination of free field and cut off frequency measurements. In this article, full experiment was execute…
Weiyang Lin
A Krylov space based time domain method for wave propagation problems is introduced. The proposed method uses the Arnoldi algorithm to obtain broad-band frequency domain solutions. This method is especially advantageous in cases where slow convergence is obse…
Fabián Acquaticci, Maximiliano M. Yommi, Sergio N. Gwirc, Sergio E. Lew
Acoustic measurements or ultrasonic testing can be strongly affected by reflections or echoes from test tank walls. In order to create a non-reflecting environment equivalent to infinite medium, a pyramidal structured absorber (PSA) can be used to coat the wa…
Shaum P. Bhagat, Anusha Yellamsetty
Stimulation of medial olivocochlear (MOC) efferent neurons reduces basilar membrane (BM) sensitivity and increases the slope of BM input-output (I/O) functions in animal models. Decreased compression of I/O functions associated with activation of MOC efferent…
William A. Hibbert, Shahram Taherzadeh, David B. Sharp
It is well established that musical sounds comprising multiple partials with frequencies approximately in the ratio of small integers give rise to a strong sensation of pitch even if the lowest or fundamental partial is missing—the so-called virtual pitch eff…
Jesús Madrigal-Melchor, Agustín Enciso-Muñoz, David Armando Contreras-Solorio, Xochitl Saldaña-Saldaña, Raúl Alberto Reyes-Villagrana
Using the transfer matrix method we calculate the frequency dependence of the transmission of longitudinal elastic waves for a layered structure where the specific acoustic impedance of the layers with odd numbering follows a Gaussian distribution, while the…
Haydar Aygün
Sound absorbers including porous materials are used widely for noise control. The most widely-exploited and acknowledged absorption mechanism in porous materials is viscous friction due to relative motion between solid and fluid. Acoustical performance of wov…
Syed Ahmed Shah, Chinta Nageswaranath, Modem Ramesh, Mangipudi Venkata Ramanamurthy
Torsional vibrations of coated hollow poroelastic spheres are studied employing Biot’s theory of wave propagation in poroelastic solid. The dilatations of solid and liquid media are zero, therefore the frequency equation of torsional vibrations is same both f…
Bernd Willimek, Daniela Willimek
The first part of this article addresses the main premise of the Theory of Musical Equilibration. It states that in contrast to previous hypotheses, music does not directly describe emotions: instead; it evokes processes of the will which the listener identif…
Paulo Henrique Trombetta Zannin, Fernanda Ferraz
This paper describes an analysis of the sound pressure levels at the exterior fa ç ade and inside the Hospital de Clínicas of the Federal University of Paraná. Measurements were taken at a total of 45 points, 24 at the exterior facade and 21 points ins…
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Open Journal of Acoustics (OJA) is an international journal dedicated to the advancement of the study of acoustics. The goal of this journal is to provide a platform for scientists and academicians all over the world to promote, share, and discuss various new issues and developments in different areas of acoustics. Al… All articles are open access under a CC BY 4.0 licence, with authors retaining copyright.
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