Results 31 to 40 of about 45,161 (201)
Real ear unaided gain and its relation with the equivalent volume of the external and middle ear
International Archives of Otorhinolaryngology, 2012 Introduction: Old age is associated with changes in the characteristics of the middle ear transmission system and in external ear resonance, and these carry implications for the hearing aid (HA) verification process for which targets and measures of the ...
Bastos, Bárbara Guimarães +2 more
doaj +3 more sources
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
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THE EFFECT OF COARSE AGGREGATE RATIO ON THE PROPERTIES OF NO FINE LIGHT WEIGHT CONCRETE
Journal of Engineering, 2009 The main object of this work is to study the effect of coarse aggregate/cement ratio (A/C) on the property of no fine concrete. In this work, three ratio of A/C were used (6, 9 and 12 by weight).The cement content is maintained constant (125kg/m3) while
Hind.H. HAMAD +1 more
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Mechanical and Acoustic properties of Bagasse – Coconut Coir based Hybrid Reinforced Composites
Journal of Natural Fibers, 2022 In this paper, a hybrid composite is developed from natural fibers of bagasse and coconut coir. The mechanical and acoustic properties of the hybrid composites are investigated.
M.K. Marichelvam +2 more
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Design and performance of duct acoustic treatment [PDF]
, 1991 The procedure for designing acoustic treatment panels used to line the walls of aircraft engine ducts and for estimating the resulting suppression of turbofan engine duct noise is discussed.
Kraft, R. E., Motsinger, R. E.
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Damage location method for thin composites structures - application to an aircraft door [PDF]
, 2013 Piezoelectric sensors are widely used for Structure Health Monitoring (SHM) technique due to their high-frequency capability. In particular, electromechanical impedance (EMI) techniques give simple and low cost solutions for detecting damage in composite
Cherrier, Olivier +3 more
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Reliability of PEA Measurement in Presence of an Air Void Defect
Energies, 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.
Antonino Imburgia +5 more
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AiResearch QCGAT engine: Acoustic test results [PDF]
, 1980 The noise levels of the quiet, general aviation turbofan (QCGAT) engine were measured in ground static noise tests. The static noise levels were found to be markedly lower than the demonstrably quiet AiResearch model TFE731 engine.
Kisner, L. S.
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Atrial fibrillation designation with micro-Raman spectroscopy and scanning acoustic microscope
Scientific Reports, 2022 Atrial fibrillation (AF) is diagnosed with the electrocardiogram, which is the gold standard in clinics. However, sufficient arrhythmia monitoring takes a long time, and many of the tests are made in only a few seconds, which can lead arrhythmia to be ...
Ugur Parlatan +10 more
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Gravitational Wave Detection with High Frequency Phonon Trapping Acoustic Cavities [PDF]
, 2014 There are a number of theoretical predictions for astrophysical and cosmological objects, which emit high frequency ($10^6-10^9$~Hz) Gravitation Waves (GW) or contribute somehow to the stochastic high frequency GW background.
Goryachev, Maxim, Tobar, Michael E.
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