Results 31 to 40 of about 440,511 (349)
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
doaj
Prediction of the vibroacoustic response of a structure-liner-fluid system based on a patch transfer function approach and direct experimental subsystem characterisation [PDF]
Applied Acoustics 112, 14-24 (2016), 2016 The vibro-acoustic response of a structure-liner-fluid system is predicted by application of a patch impedance coupling methodology. In contrast to existing numerical approaches, impedance matrices of structure and liner are determined by a direct experimental approach, avoiding the requirement of material parameters.
arxiv +1 more source
A linear acoustic model for multi-cylinder IC engine intake manifolds including the effects of the intake throttle [PDF]
, 2004 This paper presents a linear acoustic model of a multi-cylinder intake manifold that can be used as part of a hybrid time/frequency domain method to calculate the intake wave dynamics of practical naturally aspirated engines.
De Soto, I. +2 more
core +1 more source
Data-driven acoustic impedance inversion with reweighted L1 norm sparsity constraint
Frontiers in Earth Science, 2023 Acoustic impedance (AI) inversion is widely used in geophysics and reservoir prediction. But the traditional impedance inversion method cannot fully exploit the sparse characteristics of geological attributes. There are problems with multiplicity and low
Lian Zhao +7 more
doaj +1 more source
European Archives of Oto-Rhino-Laryngology, 2021 Purpose In most cases, tinnitus co-exists with hearing loss, suggesting that poorer speech understanding is simply due to a lack of acoustic information reaching the central nervous system (CNS).
D. Raj-Koziak +7 more
semanticscholar +1 more source
Towards Impedance Characterization of Carbon-Carbon Ultrasonically Absorptive Cavities via the Inverse Helmholtz Problem [PDF]
In 55th AIAA Aerospace Sciences Meeting (p. 0460) (2017), 2017 We present a numerical method to determine the complex acoustic impedance at the open surface of an arbitrarily shaped cavity, associated to an impinging planar acoustic wave with a given wavenumber vector and frequency. We have achieved this by developing the first inverse Helmholtz Solver (iHS), which implicitly reconstructs the complex acoustic ...
arxiv +1 more source
Real-time-controlled artificial quiet channel for acoustic cloaking under varying detection conditions [PDF]
, 2023 We consider the problem of hiding non-stationary objects from acoustic detection in a two-dimensional environment, where both the object's impedance and the properties of the detection signal may vary during operation. The detection signal is assumed to be an acoustic beam created by an array of emitters, which scans the area at different angles and ...
arxiv +1 more source
HADES - Hydrophone for Acoustic Detection at South Pole [PDF]
Nucl.Instrum.Meth.Suppl.A604:215-218,2009, 2008 The South Pole Acoustic Test Setup (SPATS) is located in the upper part of the optical neutrino observatory IceCube, currently under construction. SPATS consists of four strings at depths between 80 m and 500 m below the surface of the ice with seven stages per string. Each stage is equipped with an acoustic sensor and a transmitter.
arxiv +1 more source
Effect of Plastic Fibers on Properties of Foamed Concrete [PDF]
Engineering and Technology Journal, 2013 The main objective of this work is to study the effect of adding plastic fibers on Lightweight Aggregate Foamed Concrete (LWAFC) using mix proportion of 1:2.6:0.4 by volume (cement: fine Porcelanite: coarse Porcelanite) with 2% foaming agent by weight of
Hisham K. Ahmed +2 more
doaj +1 more source
Micromachines, 2022 The study of impedance matching between a transducer and its working medium is an important part of acoustic transducer design. The traditional quarter wavelength matching (Q-matching) scheme is not suitable for broadband capacitive micromachined ...
Bizhen Gao +9 more
doaj +1 more source