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Articoli di riviste sul tema "Sound – Transmission"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 20 febbraio 2023

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1

Fullerton, Jeffrey, e Alexander Maurer. "Horizontal impact sound transmission measurements". INTER-NOISE and NOISE-CON Congress and Conference Proceedings 264, n. 1 (24 giugno 2022): 900–908. http://dx.doi.org/10.3397/nc-2022-832.

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Impact sound transmission is typically considered for the floor/ceiling assembly that separates vertically stacked spaces. This is the context that ASTM E492 laboratory testing and ASTM E1007 field testing are performed. However, impact sounds often have the potential for causing significant flanking transmission through structural connections of the floor system to surrounding spaces. A common concern for possible impact sound transmission can occur with hard flooring finishes that are not isolated from the floor structure to adjacent spaces. For this condition, while it is possible to achieve adequate impact isolation vertically by using isolated ceiling assemblies, the lack of isolation for the flooring may allow significant horizontal impact sound transmission, which is not affected by the ceiling assembly. This study presents findings and comparisons from measurements of impact sound transmission testing between horizontally adjacent spaces on a concrete floor slab and a wood-framed floor assembly with different flooring underlayment conditions.

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2

Mansy, Hansen A., Robert A. Balk, William H. Warren, Thomas J. Royston, Zoujun Dai, Ying Peng e Richard H. Sandler. "Pneumothorax effects on pulmonary acoustic transmission". Journal of Applied Physiology 119, n. 3 (1 agosto 2015): 250–57. http://dx.doi.org/10.1152/japplphysiol.00148.2015.

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Pneumothorax (PTX) is an abnormal accumulation of air between the lung and the chest wall. It is a relatively common and potentially life-threatening condition encountered in patients who are critically ill or have experienced trauma. Auscultatory signs of PTX include decreased breath sounds during the physical examination. The objective of this exploratory study was to investigate the changes in sound transmission in the thorax due to PTX in humans. Nineteen human subjects who underwent video-assisted thoracic surgery, during which lung collapse is a normal part of the surgery, participated in the study. After subjects were intubated and mechanically ventilated, sounds were introduced into their airways via an endotracheal tube. Sounds were then measured over the chest surface before and after lung collapse. PTX caused small changes in acoustic transmission for frequencies below 400 Hz. A larger decrease in sound transmission was observed from 400 to 600 Hz, possibly due to the stronger acoustic transmission blocking of the pleural air. At frequencies above 1 kHz, the sound waves became weaker and so did their changes with PTX. The study elucidated some of the possible mechanisms of sound propagation changes with PTX. Sound transmission measurement was able to distinguish between baseline and PTX states in this small patient group. Future studies are needed to evaluate this technique in a wider population.

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3

Abrams, R. M., S. K. Griffiths, X. Huang, J. Sain, G. Langford e K. J. Gerhardt. "Fetal Music Perception: The Role of Sound Transmission". Music Perception 15, n. 3 (1998): 307–17. http://dx.doi.org/10.2307/40285770.

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The fetal sound environment is now known to be rich and varied. Playback of tapes made from intrauterine recordings of sounds reveals some muffling, suggesting an attenuation of high-frequency sounds at the surface of the abdominal wall and during transmission through abdominal and uterine tissues and fluids. The present experiments show how the spectral features of synthesized musical sounds are altered once they reach the ear of the fetal sheep. Below 300 Hz, intrauterine sound pressure levels are nearly identical to those recorded outside the ewe. Between 315 and 2500 Hz, the attenuation increases at a rate of 5 dB per octave. Spectral analyses of trumpet and flugelhorn sounds recorded in utero show a marked diminution in sound pressure level in partials above 600 Hz; this diminution could be perceived by the fetus as an altered timbre.

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4

Zhang, Ruojun, Guibo Wang, Xiaoming Zhou e Gengkai Hu. "A decoupling-design strategy for high sound absorption in subwavelength structures with air ventilation". JASA Express Letters 2, n. 3 (marzo 2022): 033602. http://dx.doi.org/10.1121/10.0009919.

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A strategy based on the decoupling design of two elementary structures, both made of coiled-up channels, is proposed. One channeling structure is designed for blocking sound transmission, while the other element is used for absorbing sounds at low-transmission frequencies. Based on this strategy, the sound-absorbing sample with air ventilation is fabricated and its high-absorption capability is demonstrated experimentally. The expanding of sound absorption bandwidth by combining different absorptive channels into the sample structure is also demonstrated. The proposed method provides a new route towards broadband high sound absorption in ventilated structures.

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5

Malcoci, Iulian. "Sound Reasearch in Precessional Transmission". Applied Mechanics and Materials 657 (ottobre 2014): 584–88. http://dx.doi.org/10.4028/www.scientific.net/amm.657.584.

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Sound may be defined as any pressure variation (in air, water or other medium) that the human ear can detect. Just like dominoes, a wave motion is set off when an element sets the nearest particle of air into motion. This motion gradually spreads to adjacent air particles further away from the source. Depending on the medium, sound propagates at different speeds. In air, sound propagates at a speed of approximately 340 m/s. In liquids and solids, the propagation velocity is greater 1500 m/s in water and 5000 m/s in steel [2].

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6

Tocci, Gregory C., Timothy J. Foulkes e Randolph E. Wright. "Glazing sound transmission loss studies". Journal of the Acoustical Society of America 79, S1 (maggio 1986): S31. http://dx.doi.org/10.1121/1.2023166.

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7

Mechel, F. P. "Sound transmission through suspended ceilings". Journal of the Acoustical Society of America 103, n. 5 (maggio 1998): 2783. http://dx.doi.org/10.1121/1.422269.

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8

Ou, Dayi, e Cheuk Ming Mak. "Sound transmission through stiffened plates". Journal of the Acoustical Society of America 131, n. 4 (aprile 2012): 3260. http://dx.doi.org/10.1121/1.4708178.

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9

Spindel, R. C. "Sound Transmission in the Ocean". Annual Review of Fluid Mechanics 17, n. 1 (gennaio 1985): 217–37. http://dx.doi.org/10.1146/annurev.fl.17.010185.001245.

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10

Liu, Dongxu, Zhijian Hu, Ge Wang e Lizhi Sun. "Sound Transmission-Based Elastography Imaging". IEEE Access 7 (2019): 74383–92. http://dx.doi.org/10.1109/access.2019.2921303.

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11

Brettell, J. M. "Sound transmission in granular PVC". Journal of the Acoustical Society of America 95, n. 4 (aprile 1994): 2281. http://dx.doi.org/10.1121/1.408641.

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12

CUMMINGS, A. "SOUND TRANSMISSION THROUGH DUCT WALLS". Journal of Sound and Vibration 239, n. 4 (gennaio 2001): 731–65. http://dx.doi.org/10.1006/jsvi.2000.3226.

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13

Hickling, Robert, e Wei Wei. "Sound transmission in stored grain". Applied Acoustics 45, n. 1 (1995): 1–8. http://dx.doi.org/10.1016/0003-682x(94)00017-p.

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14

Jean, P. "Sound transmission through opened windows". Applied Acoustics 70, n. 1 (gennaio 2009): 41–49. http://dx.doi.org/10.1016/j.apacoust.2008.01.007.

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15

van Zyl, B. G., e P. J. Erasmus. "Sound Transmission Analysis in Reactive Fields by Sound Intensimetry". Noise Control Engineering Journal 28, n. 3 (1987): 113. http://dx.doi.org/10.3397/1.2827682.

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16

Bohadana, A. B., e S. S. Kraman. "Transmission of sound generated by sternal percussion". Journal of Applied Physiology 66, n. 1 (1 gennaio 1989): 273–77. http://dx.doi.org/10.1152/jappl.1989.66.1.273.

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Abstract (sommario):

We indirectly determined the transmission path of sound generated by sternal percussion in five healthy subjects. We percussed the sternum of each subject while recording the output audio signal at the posterior left and right upper and lower lung zones. Sound measurements were done during apnea at functional residual capacity, total lung capacity, and residual volume both with the lungs filled with air and with an 80% He-20% O2 (heliox) gas mixture. Three acoustic indexes were calculated from the output sound pulse: the peak-to-peak amplitude, the peak frequency, and the mid-power frequency. We found that the average values of all indexes tended to be greater in the upper than in the ipsilateral lower lung zones. In the upper zones, peak-to-peak amplitude was greater at total lung capacity and residual volume than at functional residual capacity. Replacing air with heliox did not change these results. These experiments, together with others performed during Mueller and Valsalva maneuvers, suggest that resonance of the chest cage is the predominant factor determining the transmission of sternal percussion sounds to the posterior chest wall. The transmission seems to be only minimally affected by the acoustic characteristics of the lung parenchyma.

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17

Kiyokawa, Hiroshi, e Hans Pasterkamp. "Volume-dependent variations of regional lung sound, amplitude, and phase". Journal of Applied Physiology 93, n. 3 (1 settembre 2002): 1030–38. http://dx.doi.org/10.1152/japplphysiol.00110.2002.

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Acoustic imaging of the respiratory system demonstrates regional changes of lung sounds that correspond to pulmonary ventilation. We investigated volume-dependent variations of lung sound phase and amplitude between two closely spaced sensors in five adults. Lung sounds were recorded at the posterior right upper, right lower, and left lower lobes during targeted breathing (1.2 ± 0.2 l/s; volume = 20–50 and 50–80% of vital capacity) and passive sound transmission (≤0.2 l/s; volumes as above). Average sound amplitudes were obtained after band-pass filtering to 75–150, 150–300, and 300–600 Hz. Cross correlation established the phase relation of sound between sensors. Volume-dependent variations in phase (≤1.5 ms) and amplitude (≤11 dB) were observed at the lower lobes in the 150- to 300-Hz band. During inspiration, increasing delay and amplitude of sound at the caudal relative to the cranial sensor were also observed during passive transmission in several subjects. This previously unrecognized behavior of lung sounds over short distances might reflect spatial variations of airways and diaphragms during breathing.

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18

Michelsen, A., e K. Rohrseitz. "Directional sound processing and interaural sound transmission in a small and a large grasshopper". Journal of Experimental Biology 198, n. 9 (1 settembre 1995): 1817–27. http://dx.doi.org/10.1242/jeb.198.9.1817.

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Physical mechanisms involved in directional hearing are investigated in two species of short-horned grasshoppers that differ in body length by a factor of 34. The directional cues (the effects of the direction of sound incidence on the amplitude and phase angle of the sounds at the ears) are more pronounced in the larger animal, but the scaling is not simple. At high frequencies (1020 kHz), the sound pressures at the ears of the larger species (Schistocerca gregaria) differ sufficiently to provide a useful directionality. In contrast, at low frequencies (35 kHz), the ears must be acoustically coupled and work as pressure difference receivers. At 35 kHz, the interaural sound transmission is approximately 0.5 (that is, when a tympanum is driven by a sound pressure of unit amplitude at its outer surface, the tympanum of the opposite ear receives a sound pressure with an amplitude of 0.5 through the interaural pathway). The interaural transmission decreases with frequency, and above 10 kHz it is only 0.10.2. It still has a significant effect on the directionality, however, because the directional cues are large. In the smaller species (Chorthippus biguttulus), the interaural sound transmission is also around 0.5 at 5 kHz, but the directionality is poor. The reason for this is not the modest directional cues, but rather the fact that the transmitted sound is not sufficiently delayed for the ear to exploit the directional cues. Above 7 kHz, the transmission increases to approximately 0.8 and the transmission delay increases; this allows the ear to become more directional, despite the still modest directional cues.

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19

Ren, Juan, Qingjun Liu, Ting Chen e Pingye Deng. "Analytic model research of sound propagation in pipe wall with sound absorption". MATEC Web of Conferences 355 (2022): 01016. http://dx.doi.org/10.1051/matecconf/202235501016.

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There are a lot of principles for sound transmission in the pipeline for whether sound transmission structure or noise reduction structure. Even in ultrasonic testing, there is a large number of principles for using pipeline sound transmission. Based on the sound propagation model and the boundary conditions of pipe wall sound absorption, the sound propagation equation for pipe wall sound absorption is given by establishing mathematical model and solving mathematical equation in this paper. When the distribution of sound field along the cross-section of the pipe (outlet) is ignored, the transmission efficiency of sound with different frequencies can be calculated or the sound absorption efficiency can be calculated. The analytical solution of the sound transmission equation in the pipeline has great theoretical significance and practical value for guiding the structural design of sound transmission and noise reduction, improving the calculation efficiency and verifying the numerical analysis results.

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20

Byun. "Long-Range Sound Transmission Characteristics in Shallow-Water Channel with Thermocline". Journal Of The Acoustical Society Of Korea 33, n. 5 (2014): 273. http://dx.doi.org/10.7776/ask.2014.33.5.273.

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21

TAKARA, Yusuke, e Nobuo Tanaka. "3C15 Cluster control of sound transmission loss using double-leaf wall". Proceedings of the Symposium on the Motion and Vibration Control 2010 (2010): _3C15–1_—_3C15–12_. http://dx.doi.org/10.1299/jsmemovic.2010._3c15-1_.

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22

Kang, Chun-Won, e Yung-Bum Seo. "Sound Absorption and Sound Transmission Loss of Perforated Corrugated Board". Journal of Korea Technical Association of the Pulp and Paper Industry 50, n. 4 (31 agosto 2018): 32–39. http://dx.doi.org/10.7584/jktappi.2018.08.50.4.32.

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23

Sas, Paul, Wouter Dehandschutter, Rene Boonen e Antonio Vecchio. "Active control of sound transmission through an industrial sound encapsulation". Journal of the Acoustical Society of America 103, n. 5 (maggio 1998): 2964–65. http://dx.doi.org/10.1121/1.421670.

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24

Peters, Aemil J. M., Robert M. Abrams, Kenneth J. Gerhardt e Scott K. Griffiths. "Transmission of Airborne Sound from 50-20,000 Hz into the Abdomen of Sheep". Journal of Low Frequency Noise, Vibration and Active Control 12, n. 1 (marzo 1993): 16–24. http://dx.doi.org/10.1177/026309239301200103.

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The transmission of audible sounds from the environment of the pregnant woman to the foetus is of growing interest to obstetricians who utilize foetal vibracoustic stimulation in their examinations, and to occupational health professionals who believe that high-intensity sound in the workplace is potentially damaging to the foetus. Earlier reports on transmission of sound into the abdomen and uterus of sheep revealed a significant amount of sound attenuation at frequencies above 2,000 Hz. and some enhancement at frequencies below 250 Hz. However, frequencies above 10,000 Hz, and stimulus levels as possible variables, were not studied. In this report, the effects of frequency from 50-20,000 Hz. and stimulus levels (90 to 110 dB sound pressure level), were studied in five sheep. Sound attenuation varied as a function of frequency (p<0.001). Sound attenuation varied inversely as a function of stimulus level for low frequencies (50-125 Hz) and for high frequencies (7,000–20,000 Hz) (p<0.001). In the mid frequency range (200-4,000 Hz), no effect of stimulus level (p=0.96) was found. Additionally, in the 800-2,000 Hz range there was enhancement of sound pressure of up to 10 dB.

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25

Kraler, Anton, e Paola Brugnara. "Acoustic behaviour of CLT structures: influence of decoupling bearing stripes, floor assembly and connectors under storey-like loads". INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, n. 6 (1 febbraio 2023): 1179–90. http://dx.doi.org/10.3397/in_2022_0162.

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Timber buildings do not have a high acoustic performance regarding vibration transmission through the structure. Sophisticated acoustic design methods are usually not applied and noise control design for wooden buildings is often merely based on the experience of engineers. To find out the peculiarity of timber transmission, an acoustic lab test with CLT was set up. Several measurement configurations were built and airborne sound measurements according to EN ISO 16283-1 and impact sound measurements according to EN ISO 16283-2 were carried out. The test results were set in relation to reference measurements on the bare CLT slab and on a floor assembly, with and without decoupling bearing stripes and with and without connectors. In addition to the standard sound measurements, the sound transmissions through the ceiling element and through the flank components (walls) were also measured with accelerometers. The results showed in an experimental evaluation method a reduction in sound transmission and standard impact sound level. All tests were carried out with the same load of 17 kN/m on the decoupling bearing stripes and the ceiling element. The load was applied by means of threaded rods and secured by strain gauges. The influence of decoupling bearings stripes, types of fastening systems and floor structures on sound transmission through the flanking components on a real scale mock-up could therefore be investigated.

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26

Hosseini-Toudeshky, H., M. R. Mofakhami e R. Yarmohammadi. "Sound transmission between partitioned contiguous enclosures". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 223, n. 5 (4 febbraio 2009): 1091–101. http://dx.doi.org/10.1243/09544062jmes1166.

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By increasing the application of lightweight constructions, sound transmission between the adjacent enclosures becomes a more important consideration in designing new buildings. In this article, the parameters that may significantly affect the sound transmission level through a partition between two adjacent enclosures are investigated, i.e. geometrical dimensions, arrangement of enclosures, boundary conditions, multi-layered partitions, and framed (or reinforced) conditions of the partitions. For this purpose, sound transmission is modelled using the finite-element method. The obtained results from sound transmission using Perspex party walls with different width and boundary conditions are compared with those obtained from a double-layered wall with an air layer. The effects of an enclosure's arrangements and dimensions on sound transmission of the party walls are also studied. Using the cross-framed party wall causes more noise reduction than the double-layered party wall. The results also show that sound transmission between rooms with an asymmetric arrangement is less than that obtained from a symmetric configuration.

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27

Dimino, Ignazio, Pasquale Vitiello e Ferri Aliabadi. "Sound Transmission Through Triple Panel Partitions". Recent Patents on Mechanical Engineering 6, n. 3 (24 settembre 2013): 200–215. http://dx.doi.org/10.2174/22127976113069990007.

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28

Mano, Hajimu, Hiroshi Kawabe e Kouji Masaoka. "Sound Transmission of Ship Structural Panel". Journal of the Society of Naval Architects of Japan 1990, n. 168 (1990): 347–54. http://dx.doi.org/10.2534/jjasnaoe1968.1990.168_347.

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29

Park, Junhong, Luc G. Mongeau e Thomas Siegmund. "Sound transmission characteristics of bulb seals". Journal of the Acoustical Society of America 108, n. 5 (novembre 2000): 2526–27. http://dx.doi.org/10.1121/1.4743348.

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30

Cummer, S. A. "Selecting the Direction of Sound Transmission". Science 343, n. 6170 (30 gennaio 2014): 495–96. http://dx.doi.org/10.1126/science.1249616.

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31

Pizzirusso, Joseph F. "Sound transmission and absorption control media". Journal of the Acoustical Society of America 101, n. 1 (gennaio 1997): 21. http://dx.doi.org/10.1121/1.418021.

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32

Walker, Keith W. "Sound transmission loss single number ratings". Journal of the Acoustical Society of America 81, S1 (maggio 1987): S12. http://dx.doi.org/10.1121/1.2024105.

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33

Quirt, J. D., e R. E. Halliwell. "Measuring sound transmission through suspended ceilings". Journal of the Acoustical Society of America 83, S1 (maggio 1988): S60. http://dx.doi.org/10.1121/1.2025435.

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34

Morfey, Christopher L., e Roger J. Pinnington. "Sound transmission to the human fetus". Journal of the Acoustical Society of America 96, n. 5 (novembre 1994): 3305. http://dx.doi.org/10.1121/1.410830.

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35

Zhao, Jiajun, Zhi Ning Chen, Baowen Li e Cheng-Wei Qiu. "Acoustic cloaking by extraordinary sound transmission". Journal of Applied Physics 117, n. 21 (7 giugno 2015): 214507. http://dx.doi.org/10.1063/1.4922120.

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36

Young, Sarah M., Brian E. Anderson, Nicholas B. Morrill, Robert C. Davis e Richard R. Vanfleet. "Sound transmission measurements through porous screens". Journal of the Acoustical Society of America 139, n. 4 (aprile 2016): 2119. http://dx.doi.org/10.1121/1.4950307.

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37

Brenot, D. "Sound transmission into an axisymmetric enclosure". Journal of Sound and Vibration 287, n. 1-2 (ottobre 2005): 45–75. http://dx.doi.org/10.1016/j.jsv.2004.10.048.

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38

Allan, P. S., A. Ahmadnia, R. Withnall e J. Silver. "Sound transmission testing of polymer compounds". Polymer Testing 31, n. 2 (aprile 2012): 312–21. http://dx.doi.org/10.1016/j.polymertesting.2011.12.007.

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39

Shaw, Michael F., e Courthey B. Burroughs. "Airborne sound transmission across resilient mounts". Journal of the Acoustical Society of America 86, S1 (novembre 1989): S14. http://dx.doi.org/10.1121/1.2027382.

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40

Zwislocki, Jozef J., e John J. Rosowski. "Auditory Sound Transmission: An Autobiographical Perspective". Journal of the Acoustical Society of America 113, n. 3 (marzo 2003): 1191. http://dx.doi.org/10.1121/1.1547439.

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41

Fringuellino, M., e R. S. Smith. "Sound Transmission through Hollow Brick Walls". Building Acoustics 6, n. 3 (settembre 1999): 211–24. http://dx.doi.org/10.1260/1351010991501419.

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42

PARK, J., T. SIEGMUND e L. MONGEAU. "SOUND TRANSMISSION THROUGH ELASTOMERIC BULB SEALS". Journal of Sound and Vibration 259, n. 2 (gennaio 2003): 299–322. http://dx.doi.org/10.1006/jsvi.2002.5162.

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43

Golzari, Masoud, e Ali Asghar Jafari. "Sound transmission through truncated conical shells". Applied Acoustics 156 (dicembre 2019): 186–207. http://dx.doi.org/10.1016/j.apacoust.2019.07.008.

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44

Craik, R. J. M., e R. Wilson. "Sound transmission through masonry cavity walls". Journal of Sound and Vibration 179, n. 1 (gennaio 1995): 79–96. http://dx.doi.org/10.1006/jsvi.1995.0005.

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45

Wilson, R., e R. J. M. Craik. "SOUND TRANSMISSION THROUGH DRY LINED WALLS". Journal of Sound and Vibration 192, n. 2 (maggio 1996): 563–79. http://dx.doi.org/10.1006/jsvi.1996.0204.

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46

Steel, J. A., R. J. M. Craik e R. Wilson. "A Study of Vibration Transmission in a Framed Building". Building Acoustics 1, n. 1 (marzo 1994): 49–64. http://dx.doi.org/10.1177/1351010x9400100104.

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Abstract (sommario):

Sound transmission through large buildings can be studied using Statistical Energy Analysis (SEA). In this study measurements were carried out to investigate sound transmission through a framed building. Sound transmission between columns, beams, walls and floors is investigated. Sound transmission through the building is investigated and measured and predicted results are shown. Difficulties were encountered when modelling large floor slabs. The work demonstrates the application of Statistical Energy Analysis methods to the study of sound transmission in framed buildings and highlights some of the diiffculties.

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47

Borzym, Jim. "Acoustical performance of horizontal-sliding-panel operable partition walls". INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, n. 1 (1 agosto 2021): 5125–30. http://dx.doi.org/10.3397/in-2021-2974.

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Field measurements of airborne sound transmission loss were made on several operable partitions of the horizontal-sliding-panel type between conference rooms. Apparent Sound Transmission Class (ASTC) and Noise Isolation Class (NIC) ratings were computed. Very significant deviation of field-measured sound transmission ratings and manufacturers' Sound Transmission Class (STC) ratings were found. Clients were not satisfied by actual sound isolating performance. Transmission of voice was clearly audible. Some deficiencies of field conditions were found. Some deficiencies of partition installation were found. Modifications were made; acoustical performance did not change significantly.

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48

Kang, Chun-Won, Eun-Suk Jang, Sang-Sik Jang, Ho-Yang Kang, Seog-Goo Kang e Se-Chang Oh. "Sound Absorption Rate and Sound Transmission Loss of Wood Bark Particle". Journal of the Korean Wood Science and Technology 47, n. 4 (luglio 2019): 425–41. http://dx.doi.org/10.5658/wood.2019.47.4.425.

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49

Kang, Chun-Won, Nam-Ho Lee, Sang-Sik Jang e Ho-Yang Kang. "Sound Absorption Coefficient and Sound Transmission Loss of Rice Hull Mat". Journal of the Korean Wood Science and Technology 47, n. 3 (maggio 2019): 290–98. http://dx.doi.org/10.5658/wood.2019.47.3.290.

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50

Lau, S. K., e S. K. Tang. "Sound fields in a rectangular enclosure under active sound transmission control". Journal of the Acoustical Society of America 110, n. 2 (agosto 2001): 925–38. http://dx.doi.org/10.1121/1.1387095.

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