Results 11 to 20 of about 188,504 (277)
impedance tuning a method for active control of the acoustic boundary conditions of combustion test rigs [PDF]
, 2009 Eine der größten Herausforderungen für die Entwicklung zukünftiger schadstoffarmer Gasturbinenkraftwerke ist die Gewährleistung eines stabilen Verbrennungsprozesses. Um die immer strikter werdenden Emissionsrichtlinien, vor allem hinsichtlich NOx, zu erfüllen, führte die Gasturbinenindustrie die Mager-Vormisch-Verbrennung ein.
Mirko R. Bothien
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Construction and testing of a modern acoustic impedance tube
, 2001 The acoustic impedance of a material describes its reflective and absorptive properties. Acoustic impedance may be measured in a wide variety of ways. This thesis describes the construction and testing of an acoustic impedance measurement tube which employs modem Fourier Transform techniques.
Sean P. O'Malley
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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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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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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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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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Journal of the Acoustical Society of America, 2021 Measurements of acoustic properties of sound absorbing materials in impedance tubes show poor reproducibility, which was demonstrated in round robin tests.
M. Stender +4 more
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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.
Tamyne Ferreira Duarte de Moraes +2 more
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Tympanometry and CT Measurement of Middle Ear Volumes in Patients with Unilateral Chronic Otitis Media [PDF]
Clinical and Experimental Otorhinolaryngology, 2008 ObjectivesThe goals of the study were to compare the middle ear (ME) volumes from both normal and lesioned ears, and these ME volumes were measured by a digital image processing computed tomography (CT) program in patients with unilateral chronic otitis ...
Jae-Yoon Ahn +7 more
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