Search results for "Acoustic impedance"

showing 2 items of 12 documents

Audiological Investigation of Otitis Media in Children with Atopy

2011

Otitis media (OM) describes an inflammatory process within the middle ear space that is generally associated with accumulation of fluid and that may lead to hearing loss, learning difficulties, and delays in language development. The pathogenesis of OM is multifactorial, involving the adaptive and native immune system, eustachian tube dysfunction, viral and bacterial load, and genetic and environmental factors. The involvement of IgE-mediated allergic reactions in the pathogenesis of OM has been suggested by clinical observations of a high prevalence of OM among patients with allergies. Evidence from studies involving tympanometric measurements, audiometric measurements, and otoscopic exami…

Pulmonary and Respiratory Medicinemedicine.medical_specialtyAllergyHearing lossImmunologyotitis media with effusion (OME)Otoscopymiddle-ear effusionAudiologyPathogenesisAtopyHypersensitivitymedicineHumansImmunology and AllergyChildOtitis mediabusiness.industryOtitis media; middle-ear effusion; acute otitis media (AOM); otitis media with effusion (OME); allergy; Auditory tube dysfunctionAudiologyEustachian tube dysfunctionmedicine.diseaseacute otitis media (AOM)allergySettore MED/32 - AudiologiaAuditory tube dysfunctionMiddle ear effusionmedicine.anatomical_structureOtitisSettore MED/31 - OtorinolaringoiatriaAcoustic Impedance TestsImmunologyMiddle earmedicine.symptombusiness
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Reliability of PEA Measurement in Presence of an Air Void Defect

2020

This paper deals with the reliability of the Pulsed Electro-Acoustic (PEA) technique in the case of a specimen containing an air layer. The first approach to this study has been proposed by the authors in previously published works. In these papers, the mathematical description, the PEA cell simulation model, and some experimental tests have been reported. In this work, a more accurate description of the acoustic wave behavior within the PEA cell and specimen with and without an air layer is given. Moreover, the comparison between simulation and experimental tests for both cases (specimen with and without air layer) allowed the validation of the previously developed PEA cell simulation mode…

Void (astronomy)Control and OptimizationMaterials sciencePEA method020209 energyair voidEnergy Engineering and Power Technology02 engineering and technologyDielectriclcsh:Technology01 natural sciencesAir layer0103 physical sciences0202 electrical engineering electronic engineering information engineeringElectrical and Electronic EngineeringComposite materialEngineering (miscellaneous)Space charge HVDC air void PEA method multilayer010302 applied physicsHVDCmultilayerlcsh:TRenewable Energy Sustainability and the EnvironmentAcoustic waveSpace chargeSettore ING-IND/31 - Elettrotecnicaspace charge; HVDC; air void; PEA method; multilayerspace chargeAcoustic impedanceSingle layerEnergy (miscellaneous)Energies
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