The role of diffraction in sound transmission through air-water interfaces

2016 ◽  
Vol 140 (4) ◽  
pp. 3168-3168
Author(s):  
Oleg A. Godin
Keyword(s):  
Sound Transmission

The role of third windows on human sound transmission of forward and reverse stimulations: A lumped-parameter approach

2020 ◽  
Vol 147 (3) ◽  
pp. 1478-1490 ◽  
Author(s):  
Lin Xue ◽  
Houguang Liu ◽  
Wenbo Wang ◽  
Jianhua Yang ◽  
Yu Zhao ◽  
...  
Keyword(s):  
Sound Transmission ◽  
Lumped Parameter ◽  
Parameter Approach

scholarly journals The Role of Studs in the Sound Transmission of Double Walls

2009 ◽  
Vol 95 (3) ◽  
pp. 555-567 ◽  
Author(s):  
J. Poblet-Puig ◽  
A. Rodríguez-Ferran ◽  
C. Guigou-Carter ◽  
M. Villot
Keyword(s):  
Sound Transmission

The Role of Pars Flaccida in Human Middle Ear Sound Transmission

1988 ◽  
Vol 98 (4) ◽  
pp. 310-314 ◽  
Author(s):  
Hiroshi Aritomo ◽  
Richard L. Goode ◽  
James Gonzalez
Keyword(s):  
Middle Ear ◽  
Sound Transmission ◽  
Measuring System ◽  
Human Beings ◽  
Pars Flaccida ◽  
Acoustic Insulation ◽  
Before And After ◽  
Temporal Bones ◽  
A Minor

The role of the pars flaccida in middle ear sound transmission was studied with the use of twelve otoscopically normal, fresh, human temporal bones. Peak-to-peak umbo displacement in response to a constant sound pressure level at the tympanic membrane was measured with a noncontacting video measuring system capable of repeatable measurements down to 0.2 micron. Measurements were made before and after pars flaccida modifications at 18 frequencies between 100 and 4000 Hz. Four pars flaccida modifications were studied: (1) acoustic insulation of the pars flaccida to the ear canal with a silicone rubber baffle, (2) stiffening the pars flaccida with cyanoacrylate cement, (3) decreasing the tension of the pars flaccida with a nonperforating incision, and (4) perforation of the pars flaccida. All of the modifications (except the perforation) had a minimal effect on umbo displacement; this seems to imply that the pars flaccida has a minor acoustic role in human beings.

Study on the Influence of Volute to Flow-Induced Noise in Centrifugal Pump

2012 ◽  
Vol 516-517 ◽  
pp. 1009-1017 ◽  
Author(s):  
Qiao Rui Si ◽  
Shou Qi Yuan ◽  
Jian Ping Yuan ◽  
Chuan Wang ◽  
Jun Yang
Keyword(s):  
Centrifugal Pump ◽  
Transmission Loss ◽  
Incidence Angle ◽  
Sound Transmission ◽  
Sound Field ◽  
Acoustic Coupling ◽  
Flow Induced Noise ◽  
Structure Vibration ◽  
Full Reflection

More and more attention has been attached on flow-induced noise of centrifugal pump in recent years because of strict environmental noise restrictions and demands of clients.. In this paper, the role of volute impacted on flow-induced noise generation and propagation in centrifugal pump were summarized. The process of internal wave propagation was analyzed, and the transmission coefficient and loss of volute were calculated; In order to compare the effect of volute vibration on the sound field in a centrifugal pump, a hybrid algorithm based on CFD + BEM was adopted. The results reveals that: full reflection of sound wave occurs on the fluid-steel volute wall when the incidence angle is more than or equal to 13.8 °; otherwise a sound transmission appears; For onshore pumps, For onshore pumps the A-weighted sound transmission loss is more than 55dB under the condition that thickness volute is not less than 8mm; For submersible pumps, all-bottom sound below 3000Hz almost transmits to the outside field entirely; structure acoustic coupling between volute and the internal sound field influence little on directivity of sound field and the change of law, but structure vibration would average the sound pressure level in frequency.

The Telephone Revisited

2021 ◽  
pp. 151-164
Author(s):  
Laszlo Solymar
Keyword(s):  
Civil Wars ◽  
Sound Transmission ◽  
German Occupation ◽  
The Us

The telephone becomes widespread in Europe (particularly in Denmark and Sweden) and in the US. In France, according to Colette, a popular authoress at the time: “The telephone is only for men concerned with important business matters and for women who have something to hide.” The principles of sound transmission and the operation of the telephone are discussed in simple terms. The use of the telephone is recommended in advertisements for contact with domestic staff and a cartoon is shown depicting the usefulness of the telephone by contacting the police in case of a burglary. The role of the telephone in revolutions, in civil wars, and during the German Occupation of France is discussed.

Sound insulation of multi-layer glass-fiber felts: Role of morphology

2016 ◽  
Vol 87 (3) ◽  
pp. 261-269 ◽  
Author(s):  
Yong Yang ◽  
Binbin Li ◽  
Zhaofeng Chen ◽  
Ni Sui ◽  
Zhou Chen ◽  
...  
Keyword(s):  
Glass Fiber ◽  
Transmission Loss ◽  
Resonance Effect ◽  
Sound Transmission ◽  
Areal Density ◽  
Sound Insulation ◽  
Sound Transmission Loss ◽  
Layer Structures ◽  
Air Layers

Glass-fiber felts have emerged as a popular material for noise reduction. This paper investigates the effect of various morphologies (micro-layer, macro-layer and air-layer) of glass-fiber felts on sound insulation. The sound transmission loss is measured by a Brüel & Kjár (B&K) impedance tube. The results show that the sound insulation of glass-fiber felts can be improved by increasing the number of macro-layers. The comparison between the macro- and micro-layer of glass-fiber felts on sound insulation is systematically carried out. Notably, the sound transmission loss of glass-fiber felts with similar areal density and thickness favors macro-layer structures over micro-layer structures. A simple model is established to explain this phenomenon. In addition, the sound transmission loss exhibits period fluctuations due to the presence of the air-layer between glass-fiber felts, which can be theoretically explained by the resonance effect. It is found that sound transmission loss can be improved by increasing the number of air-layers.

scholarly journals Are suspensory ligaments important for middle ear reconstruction?

PLoS ONE ◽  
2021 ◽  
Vol 16 (8) ◽  
pp. e0255821
Author(s):  
Eileen Y. Brister ◽  
Robert H. Withnell ◽  
Pavel Shevchenko ◽  
Claus-Peter Richter
Keyword(s):  
Middle Ear ◽  
Significant Role ◽  
Sound Transmission ◽  
Ossicular Chain ◽  
Ear Reconstruction ◽  
Hearing Sensitivity ◽  
Wide Range ◽  
Middle Ear Reconstruction ◽  
The Impact

As the resolution of 3D printing techniques improves, the possibility of individualized, 3-ossicle constructions adds a new dimension to middle ear prostheses. In order to optimize these designs, it is essential to understand how the ossicles and ligaments work together to transmit sound, and thus how ligaments should be replicated in a middle ear reconstruction. The middle ear ligaments are thought to play a significant role in maintaining the position of the ossicles and constraining axis of rotation. Paradoxically, investigations of the role of ligaments to date have shown very little impact on middle ear sound transmission. We explored the role of the two attachments in the gerbil middle ear analogous to human ligaments, the posterior incudal ligament and the anterior mallear process, severing both attachments and measuring change in hearing sensitivity. The impact of severing the attachments on the position of the ossicular chain was visualized using synchrotron microtomography imaging of the middle ear. In contrast to previous studies, a threshold change on the order of 20 dB across a wide range of frequencies was found when both ligaments were severed. Concomitantly, a shift in position of the ossicles was observed from the x-ray imaging and 3D renderings of the ossicular chain. These findings contrast with previous studies, demonstrating that these ligaments play a significant role in the transmission of sound through the middle ear. It appears that both mallear and incudal ligaments must be severed in order to impair sound transmission. The results of this study have significance for middle ear reconstructive surgery and the design of 3D-printed three-ossicle biocompatible prostheses.

Role of dactinomycin in the improved survival of children with Wilms' tumor

JAMA ◽  
1966 ◽  
Vol 195 (12) ◽  
pp. 1005-1009 ◽  
Author(s):  
D. J. Fernbach
Keyword(s):  
Wilms Tumor
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