Results 1 to 10 of about 45,141 (181)
Acoustic non-destructive testing of high temperature degraded concrete with comparison of acoustic impedance [PDF]
MATEC Web of Conferences, 2018 The paper is focused on non-destructive measurement of high temperature degraded concrete test specimens of three mixtures different by the use of coarse aggregate. Testing is done by ultrasonicpulse velocitymethod and Impact-Echo method. Non-destructive
Dvořák Richard +2 more
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AcousticsIn this study, the limits of using the impedance tube, or Kundt tube, are examined using the two-microphone method to obtain the normal acoustic absorption coefficient when analyzing the sound absorption properties of lightweight acoustic fabrics ...
David Caballol +2 more
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Analysis of wideband tympanometry in Ménière’s disease
Brazilian Journal of Otorhinolaryngology, 2022 Introduction: Endolymphatic hydrops is the pathophysiological substrate of Ménière’s disease. The changes in the inner ear, transmitted to the middle ear through changes in the ossicular chain mobility, can be quantified by wideband tympanometry, through
Gisela Andrea Yamashita Tanno +7 more
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International Archives of Otorhinolaryngology, 2022 Introduction Otosclerosis is characterized by the fixation of the stapes to the oval window, thereby impairing acoustic signal absorbance. A commonly used surgical technique for improving hearing in cases of otosclerosis is stapedotomy.
Alessandra Spada Durante +5 more
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Acoustic Experimental Technology for Aircraft Nacelle Liner
Aerospace, 2023 An aircraft nacelle acoustic liner is a key mean of aircraft noise reduction. The success of its design depends strongly on the development of experimental technology, which is generally divided into two stages: impedance eduction and the modal ...
Qun Yan +5 more
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Middle ear resonance in infants: Age effects
International Archives of Otorhinolaryngology, 2012 Summary Introduction: The resonant frequency is the probe frequency in which susceptance is 0 due to the neutralization of the forces of mass and stiffness components that control the middle ear.
Karina Delgado André +2 more
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Polymer Testing, 2022 The acoustic properties of sealing systems are essential for the noise control of new-generation vehicles and closure systems. Accurate characterization of the elastic elastomer properties is essential to perform acoustic analyses; however, this ...
Orçun Saf, Haluk Erol, Ali Erkin Kutlu
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Eustachian Tube Opening Measurement by Sonotubometry Using Perfect Sequences for Healthy Adults [PDF]
Clinical and Experimental Otorhinolaryngology, 2016 Objectives The aim of this study was to establish the rate variation of sonotubometric measurements using a specific broadband class of signals, the so-called perfect sequences (PSEQ) among healthy adults and to identify an optimal and technically simple
Vilma Beleskiene +5 more
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Effect of Different Positions of the Head on Tympanometry Results: An Exploratory Study
Bengal Journal of Otolaryngology and Head Neck Surgery, 2017 Introduction Tympanometry is an objective measure of middle ear function that has been an integral part of the audiological evaluation test battery, for nearly three decades.
Indranil Chatterjee +3 more
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Experimentally testing impedance boundary conditions for acoustic liners with flow: Beyond upstream and downstream [PDF]
Journal of Sound and Vibration, 2020 Impedance eduction experiments on acoustic liners with flow have systematically shown the educed impedance depending on the direction of the incident wave. Recent attempts to model this dependence include impedance boundary conditions with an additional degree of freedom. In this case, both upstream and downstream acoustic sources must be used to educe
André Mateus Netto Spillere +3 more
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