Results 11 to 20 of about 3,530,342 (253)
Computational modelling of acoustic scattering of a sound source in the vicinity of the ground [PDF]
, 2009 The paper presents a computational model for acoustic scattering of a near-the- ground sound source around a body moving in a uniform flow. Using the method of images and the concept of reflection coefficient, the half space Green's function in a ...
Pantazopoulou, Panagiota +1 more
core +7 more sources
Acoustic Vector-Corrected Impedance Meter [PDF]
, 2014 We describe the development of a novel instrument intended for the measurement of the acoustical reflection coefficient of materials. The instrument effectively implements a one-port vector-corrected network analyzer in the acoustic, rather than the ...
Scott, Jonathan B., Pennington, Kyle
core +1 more source
Multifrequency tympanometry in infants
International Archives of Otorhinolaryngology, 2012 Introduction: The use of conventional tympanometry is not sufficiently sensitive to detect all cases of middle ear changes, and this hinders accurate diagnosis.
Moraes, Tamyne Ferreira Duarte +2 more
doaj +3 more sources
A comparison of impedance boundary conditions for flow acoustics [PDF]
, 2013 Acoustic liners remain a key technology for reducing community noise from aircraft engines. The choice of optimal impedance relies heavily on the modeling of sound absorption by liners under grazing flows.
Gabard, G.
core +1 more source
Enhancement in fire retardant Properties of Coconut Coir/Polyurethane acoustic composites
Journal of Natural Fibers, 2022 This study aims to enhance the flammability properties of coconut coir and polyurethane resin sound-absorbing material. Sound absorption properties of the material for normal sound incidence were measured using impedance tube setup up based on ISO 10534 ...
Nirmala H. Bhingare, S. Prakash
doaj +1 more source
The impact of regular diving on the condition of the middle ear
International Journal of Occupational Medicine and Environmental Health, 2021 Objectives It is generally held that exposure to both high-pressure and long-lasting contact with water makes diving a potentially hazardous sports activity as far as the ears are concerned.
Olgierd Stieler +6 more
doaj +1 more source
Clinical evaluation of Eustachian tube transience and function in patients with different types of increased nasal resistance [PDF]
Vojnosanitetski Pregled, 2009 Background/Aim. Eustachian tube is a connection between throat and the middle ear. Inflammatory processes and malformations of nasal cavity could lead to dysfunction of the whole upper respiratory tract, this emphasizing the evaluation of the Eustachian ...
Andrić-Filipović Snežana +3 more
doaj +1 more source
The potential of date palm midribs-based fabric acoustic panels for sustainable interior design
Ain Shams Engineering Journal, 2023 This paper presents an experimental study of acoustic absorption of novel fabric acoustic panels utilizing non-woven fabric cores and fabric facings made of date palm midribs-fibers; to be used as absorbent panels for spaces with privacy needs.
E.A. Darwish, Mohamad Midani
doaj +1 more source
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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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