Relevant bibliographies by topics / High frequency sound

Academic literature on the topic 'High frequency sound'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "High frequency sound"

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Harusawa, Koki, Yumi Inamura, Masaaki Hiroe, Hideyuki Hasegawa, Kentaro Nakamura, and Mari Ueda. "Measurement of very high frequency (VHF) sound in our daily experiences." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 2 (August 1, 2021): 4275–82. http://dx.doi.org/10.3397/in-2021-2647.

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Recently, it is frequently reported that very high frequency (VHF) sounds are emitted from daily necessaries such as home electric appliances. Although we measured VHF sounds from home electric appliances in our previous study, the origins of such VHF sounds have not yet been identified. In the present study, we tried to identify the VHF sound source in each home electric appliance using a "sound camera", which visualizes the spatial distribution of the sound intensity using a microphone array. The sound camera visualized the location of the sound source at frequencies from 2 to 52 kHz with a field of view of 63 degrees. The sound camera elucidated that the VHF sounds were emitted from the power source of a LET light, the ventilation duct of an electric fan, and the body of an IH cooker. Their frequency characteristics were dependent on the sound source, i.e., combinations of pure tones in the LED light and distributing in a wide frequency range in the electric fan.
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Oohashi, Tsutomu, Emi Nishina, Manabu Honda, Yoshiharu Yonekura, Yoshitaka Fuwamoto, Norie Kawai, Tadao Maekawa, Satoshi Nakamura, Hidenao Fukuyama, and Hiroshi Shibasaki. "Inaudible High-Frequency Sounds Affect Brain Activity: Hypersonic Effect." Journal of Neurophysiology 83, no. 6 (June 1, 2000): 3548–58. http://dx.doi.org/10.1152/jn.2000.83.6.3548.

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Although it is generally accepted that humans cannot perceive sounds in the frequency range above 20 kHz, the question of whether the existence of such “inaudible” high-frequency components may affect the acoustic perception of audible sounds remains unanswered. In this study, we used noninvasive physiological measurements of brain responses to provide evidence that sounds containing high-frequency components (HFCs) above the audible range significantly affect the brain activity of listeners. We used the gamelan music of Bali, which is extremely rich in HFCs with a nonstationary structure, as a natural sound source, dividing it into two components: an audible low-frequency component (LFC) below 22 kHz and an HFC above 22 kHz. Brain electrical activity and regional cerebral blood flow (rCBF) were measured as markers of neuronal activity while subjects were exposed to sounds with various combinations of LFCs and HFCs. None of the subjects recognized the HFC as sound when it was presented alone. Nevertheless, the power spectra of the alpha frequency range of the spontaneous electroencephalogram (alpha-EEG) recorded from the occipital region increased with statistical significance when the subjects were exposed to sound containing both an HFC and an LFC, compared with an otherwise identical sound from which the HFC was removed (i.e., LFC alone). In contrast, compared with the baseline, no enhancement of alpha-EEG was evident when either an HFC or an LFC was presented separately. Positron emission tomography measurements revealed that, when an HFC and an LFC were presented together, the rCBF in the brain stem and the left thalamus increased significantly compared with a sound lacking the HFC above 22 kHz but that was otherwise identical. Simultaneous EEG measurements showed that the power of occipital alpha-EEGs correlated significantly with the rCBF in the left thalamus. Psychological evaluation indicated that the subjects felt the sound containing an HFC to be more pleasant than the same sound lacking an HFC. These results suggest the existence of a previously unrecognized response to complex sound containing particular types of high frequencies above the audible range. We term this phenomenon the “hypersonic effect.”
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Dunning, Dennis J., Quentin E. Ross, Paul Geoghegan, James J. Reichle, John K. Menezes, and John K. Watson. "Alewives Avoid High-Frequency Sound." North American Journal of Fisheries Management 12, no. 3 (August 1992): 407–16. http://dx.doi.org/10.1577/1548-8675(1992)012<0407:aahfs>2.3.co;2.

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Spangler, Hayward G. "High-Frequency Sound Production by Honeybees." Journal of Apicultural Research 25, no. 4 (January 1986): 213–19. http://dx.doi.org/10.1080/00218839.1986.11100720.

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Ridwan, Muhammad, and Ulfah Nurul Amanah. "Fundamental Frequency and Tone in Arabic Vowels and Consonants by Indonesian Speakers Aged 5 Years Old." Jurnal Humaniora 31, no. 3 (December 2, 2019): 274. http://dx.doi.org/10.22146/jh.32581.

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This study discusses the fundamental frequency and tone in Arabic vowels and consonants by Indonesian speakers aged 5 years old. The method of data collecting used an interview method by recording and writing techniques. It also employed one respondent who was 5 years old from the Javanese who resides in Surakarta city. The device used for recording was OPPO Joy 3 mobile phone, which is equipped with RecForge II program and microphone that can record sound clearly. An instrument that was used to know the fundamental frequency and tone was Praat 6.0.26 version. The method of data analysis employed comparing method using the basic technique of elemental sorter technique, connecting technique, and differential technique. The result of the analysis showed that the fundamental frequency is correlated with the tone. If the fundamental frequency was high and likewise the tone. A vowel sound with the high fundamental frequency is sound [u], followed by [i], then [a]. The high and low frequency of vowel sounds affected the frequency of the consonant sound followed by the vowel. It was known that 52% of consonants with the high tone were accompanied by punctuation [d̪ˤammah], 40% were accompanied by punctuation [kasrah], and 8% were accompanied by punctuation [fatħah]. The highest frequency sounding group was the apico-palatal sound. It happened since the apico-palatal sound was produced by vocal cord in a high vibration influencing the fundamental frequency and tone. Whereas, the group of consonant sounds with the lowest frequency was a pharyngeal sound as it had a low vibration on the vocal cord; hence, it only produced the low frequency sound.
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ITO, Kae, Tatsuya ISHII, Shunji ENOMOTO, and Hitoshi ISHIKAWA. "High frequency sound reduction by air shield." Transactions of the JSME (in Japanese) 86, no. 884 (2020): 19–00374. http://dx.doi.org/10.1299/transjsme.19-00374.

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Davis, J. P., H. Choi, J. Pollanen, and W. P. Halperin. "High Frequency Sound in Superfluid 3He-B." Journal of Low Temperature Physics 153, no. 1-2 (August 19, 2008): 1–14. http://dx.doi.org/10.1007/s10909-008-9819-1.

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Dell'Anna, R., G. Ruocco, M. Sampoli, and G. Viliani. "High Frequency Sound Waves in Vitreous Silica." Physical Review Letters 80, no. 6 (February 9, 1998): 1236–39. http://dx.doi.org/10.1103/physrevlett.80.1236.

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Ma, Zha Gen, Xue Ying Xu, and Guo Hua Han. "The Study on Influence of High Frequency Noise on Sound Quality for Generator." Applied Mechanics and Materials 105-107 (September 2011): 74–79. http://dx.doi.org/10.4028/www.scientific.net/amm.105-107.74.

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As cars become quieter the sound quality of components becomes more critical in the customer perception of car quality. This requires a need of new evaluation method for the specification of component sounds. Considering that high frequency noise plays an important roll for internal noise, the noise signals in the range from 7000Hz to 8000Hz are specially emphasized. Then the acoustic evaluation parameters, such as Sound Pressure Level, Sharpness and Steadiness have been evaluated. Judged from experiences and measuring results, an abnormal noise comes from Generator, through the exchange of Generator, Sound Pressure Level and sharpness were greatly improved. At the same time, subjective evaluation also indicated that there was no complaint any more in passenger compartment. Low Sound Pressure Level, sharpness can lead to perceived high product quality.
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Vos, Joos, and Mark M. J. Houben. "Annoyance caused by the low-frequency sound produced by aircraft during takeoff." Journal of the Acoustical Society of America 152, no. 6 (December 2022): 3706–15. http://dx.doi.org/10.1121/10.0016596.

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In a laboratory study, the indoor annoyance caused by the sound produced by aircraft during the takeoff on the runway is investigated. This aircraft sound is dominated by relatively high sound levels in the 16 and 31.5 Hz octave bands. Road-traffic and passenger railway sounds, which lack high sound levels in these octave bands, are included as references. The sounds are presented at indoor A-weighted equivalent levels of 32 and 42 dB. The participants are males and females between 20 and 40, or between 40 and 60 years of age. The indoor annoyance increased with sound level, but it was not affected by source type. Moreover, it was not or hardly affected by gender or age. With the dose expressed as A-weighted outdoor levels, the penalty for the aircraft sound and the bonus for the passenger railway sound at least qualitatively correspond to those obtained in pertinent previous studies. In the present study, such adjustments can be avoided by including the difference between the outdoor C-weighted and A-weighted levels as a second predictor, yielding an explained variance in the mean indoor annoyance ratings as high as 98%.
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Dissertations / Theses on the topic "High frequency sound"

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Joseph, P. F. "Active control of high frequency enclosed sound fields." Thesis, University of Southampton, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280927.

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Torres, Juan C. "Modeling of high-frequency acoustic propagation in shallow water." Thesis, Monterey, Calif. : Naval Postgraduate School, 2007. http://bosun.nps.edu/uhtbin/hyperion-image.exe/07Jun%5FTorres.pdf.

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Rouse, Jerry Wayne. "Energy-Based Boundary Element Method for High-Frequency Broadband Sound Fields in Enclosures." NCSU, 2000. http://www.lib.ncsu.edu/theses/available/etd-20000911-161316.

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This work sets forth a new method for predicting the spatialvariation of mean square pressure within two-dimensionalenclosures containing high-frequency broadband sound fieldsand light to moderate absorption. In the new method, theenclosure boundaries are replaced by a continuousdistribution of broadband uncorrelated sources, each ofwhich provides a constituent field expressed in terms ofmean square pressure and time average intensity variables.Superposition of these fields leads to the overall meansquare pressure and time average intensity as a function ofposition. Boundary conditions for radiating and absorbingsurfaces are recast in terms of energy and intensityvariables. The approach is implemented as a boundaryelement formulation for efficient evaluation of the pressureand intensity fields in enclosures. In contrast totraditional boundary element methods, the new method isindependent of frequency. A two-dimensional model problemenclosure is investigated to verify the new method. The exact analytical solution for the mean square pressuredistribution within the model problem enclosure is obtainedand compared to the results predicted by the new method.The comparisons indicate that the new method is asignificant improvement upon classical diffuse field theoryand computationally efficient relative to traditional boundary element methods and ray tracing techniques.

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Davis, Darren D. "Characterization of the MEMS directional sound sensor in the high frequency (15 - 20 kHz) range." Monterey, California. Naval Postgraduate School, 2011. http://hdl.handle.net/10945/10588.

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The Sensor Research Laboratory (SRL) at Naval Postgraduate School (NPS) has developed a micro-electromechanical system (MEMS) based directional sound sensors that mimics the aural system of the Ormia Ochracea Fly. The goal of this research is to characterize a set of directional sound sensors with varying configurations that operate in the high frequency range (15?20 kHz). The sensor consists of two identical wings coupled in the middle and the entire structure is connected to a substrate using two legs in the middle. In response to sound, the coupled wings oscillate with rocking and bending like motions at frequencies that depend on the mechanical characteristics of the structure. A simulation of sensor characteristics using COMSOL finite element software showed a resonant frequency of about 20 kHz for each device. The devices were fabricated by the MEMSCAP foundry service using silicon-on-insulator (SOI) substrate with a 25 ?m device layer. Using a laser vibrometer, response to incident sound pressure was measured at different frequencies and angles. All the devices showed that measured and simulated frequencies were in reasonably close agreement. The measurements showed good sensitivity to the direction of sound as predicted.
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Sun, Chao. "Acoustic characterisation of ultrasound contrast agents at high frequency." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/8093.

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This thesis aims to investigate the acoustic properties of ultrasound contrast agents (UCAs) at high ultrasound frequencies. In recent years, there has been increasing development in the use of high frequency ultrasound in the fields of preclinical, intravascular, ophthalmology and superficial tissue imaging. Although research studying the acoustic response of UCAs at low diagnostic ultrasonic frequencies has been well documented, quantitative information on the acoustical properties of UCAs at high ultrasonic frequencies is limited. In this thesis, acoustical characterisation of three UCAs was performed using a preclinical ultrasound scanner (Vevo 770, VisualSonics Inc., Canada). Initially the acoustical characterisation of five high frequency transducers was measured using a membrane hydrophone with an active element of 0.2 mm in diameter to quantify the transmitting frequencies, pressures and spatial beam profiles of each of the transducers. Using these transducers and development of appropriate software, high frequency acoustical characterisation (speed and attenuation) of an agar-based tissue mimicking material (TMM) was performed using a broadband substitution technique. The results from this study showed that the acoustical attenuation of TMM varied nonlinearly with frequency and the speed of sound was approximately constant 1548m·s-1 in the frequency range 12-47MHz. The acoustical properties of three commercially available lipid encapsulated UCAs including two clinical UCAs Definity (Lantheus Medical Imaging, USA) and SonoVue (Bracco, Italy) and one preclinical UCAs MicroMarker (untargeted) (VisualSonics, Canada) were studied using the software and techniques developed for TMM characterisation. Attenuation, contrast-to-tissue ratio (CTR) and subharmonic to fundamental ratio were measured at low acoustic pressures. The results showed that large off-resonance and resonant MBs predominantly contributed to the fundamental response and MBs which resonated at half of the driven frequency predominantly contributed to subharmonic response. The effect of needle gauge, temperature and injection rate on the size distribution and acoustic properties of Definity and SonoVue was measured and was found to have significant impacts. Acoustic characterisations of both TMM and UCAs in this thesis extend our understanding from low frequency to high frequency ultrasound and will enable the further development of ultrasound imaging techniques and UCAs design specifically for high frequency ultrasound applications.
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MORE, SHASHIKANT R. "EXPERIMENTAL CHARACTERIZATION AND ACTIVE CONTROL SIMULATION OF THE ACOUSTIC NOISE RESPONSE OF A HIGH-FIELD, HIGH RATE MRI SCANNER." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1100536748.

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Posner, H. Ingmar. "A composite linear aperture model of the high-frequency sound scattering profile of schools of farmed fish." Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.427758.

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Brewin, Mark Paul. "Carotid atherosclerotic plaque characterisation by measurement of ultrasound sound speed in vitro at high frequency, 20 MHz." Thesis, Queen Mary, University of London, 2010. http://qmro.qmul.ac.uk/xmlui/handle/123456789/699.

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The first part of the study was to characterise the acoustic properties of an IEC agar-based tissue mimicking material (TMM) at ultrasound frequencies centred around 20 MHz. The TMM acoustic properties measured were the amplitude attenuation coefficient (dB cm-1MHz-1), the sound speed (ms-1) and the backscattered power spectral density characteristics of spectral slope (dB MHz-1), y-axis intercept (dB) and reflected power (dB). The acoustic properties were measured over a temperature range of 22 - 37oC. Both the attenuation coefficient and sound speed, both group and phase, showed good agreement with the expected values of 0.5 dB cm-1 MHz-1 and 1540 ms-1 respectively with average values of 0.49 dB cm-1MHz-1 (st.dev. ± 0.03) and 1541.9 ms-1 (st.dev. ± 8.5). Overall, this non-commercial agar-based TMM was shown to perform as expected at the higher frequency range of 17-23 MHz and was seen to retain its acoustic properties of attenuation and speed of sound over a three year period. For the second part of the study, composite sound speed was measured in carotid plaque embedded in TMM. The IEC TMM was adapted to a clear agar gel. The contour maps from the attenuation plots were used to match the composite sound speed data to the photographic mask of plaque outline and thus the histological data. By solution of sets of simultaneous equations using a matrix inversion, the individual speed values for five plaque components were derived; TMM, elastin, fibrous/collagen, calcification and lipid. The results for derived sound speed in the adapted TMM were consistently close to the expected value of soft tissue, 1540 ms-1. The fibrous tissue showed a mean value of 1584 ms-1 at body temperature, 37oC. The derived sound speeds for elastic and lipid exhibited large inter-quartile ranges. The calcification had a significantly higher sound speed than the other plaque components at 1760 - 2000 ms-1.
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Griffin, S. J. "Sensitivity to interaural timing differences within high-frequency sounds." Thesis, University College London (University of London), 2006. http://discovery.ucl.ac.uk/1445561/.

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Interaural Timing Differences (ITDs) are a cue for sound localisation. In response to low-frequency sounds, sensitivity to ITDs can be conveyed by the fine-structure of the sound waveform. In response to high-frequency sounds, sensitivity to ITDs can only be conveyed by the amplitude modulated envelope of the sound waveform. Sensitivity to ITDs within high-frequency sounds has classically been described as poorer than in response to low-frequency sounds. However, using a "transposed" sound stimulus, it has been shown that human sensitivity to ITDs in high-frequency sounds can be equivalent to sensitivity to ITDs in low-frequency sounds. In the present study, sensitivity to ITDs was investigated in the responses of neurons from the Inferior Colliculus of the guinea pig using transposed, and conventional, stimuli. A neural correlate of the improvement in sensitivity to ITDs provided by transposed tones was found. ITD-tuning functions had greater depths of modulation in response to transposed tones as compared to conventional stimuli, and neural discrimination thresholds for ITDs in transposed tones were similar to those obtained in response to low-frequency tones. Neural coding of ITDs at low frequencies has been shown to depend on a neuron's frequency tuning. Therefore, the responses of neurons were examined for evidence of frequency-dependent tuning to ITDs in the envelope of high-frequency stimuli. The frequency-dependent ITD-tuning that was found contradicts a model of ITD coding proposed in 1948 by Jeffress. ITD-coding at high-frequencies, similarly to at low- frequencies, may use a population of neurons which are broadly tuned to ITDs. It is suggested that sensitivity to ITDs in the envelope of high-frequency sounds is restricted both by peripheral processing and also by an upper fm above which sensitivity to ITDs does not occur. For these reasons, the physiological relevance of sensitivity to ITDs in the envelope of high-frequency may be limited.
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Kubálek, Jiří. "Vysokofrekvenční pulsace při provozu vodní turbíny." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-234198.

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This thesis is concentrated on mathematical modeling of high frequency pulsations in pump turbines, which are the source of high-cycle continuous stress of the spiral casing cover, wicket gates and runner. There are proposed the solutions using the transfer matrix for the tube with a constant and conical cross-section. The paper compares variations of cylindrical and conical tubes, changes in boundary conditions. There are the models of PSPP Dlouhé Stráně made only of cylindrical tubes comparing to the model with cylindrical and conical tubes
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Books on the topic "High frequency sound"

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High Frequency Ocean Acoustics Conference (2004 La Jolla, Calif.). High frequency ocean acoustics: High Frequency Ocean Acoustics Conference : La Jolla, California, 1-5 March, 2004. Edited by Porter Michael B, Siderius Martin, Kuperman William A, United States. Office of Naval Research., and Acoustical Society of America. Melville, N.Y: American Institute of Physics, 2004.

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Redford, Allan Gordon. The response of the averaged compound auditory action potential to high frequency sound in Locusta migratoria. Ottawa: National Library of Canada, 1990.

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Molinet, édéric. Acoustic High-Frequency Diffraction Theory. Momentum Press, 2011.

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(Editor), Michael B. Porter, Martin Siderius (Editor), and William A. Kuperman (Editor), eds. High Frequency Ocean Acoustics: High Frequency Ocean Acoustics Conference (AIP Conference Proceedings). American Institute of Physics, 2004.

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Grad, Harold. High Frequency Sound According to the Boltzmann Equation. Creative Media Partners, LLC, 2018.

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High-frequency instability of the sheath-plasma resonance. Los Angeles, CA: Dept. of Physics, University of California, 1990.

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High-frequency instability of the sheath-plasma resonance. Los Angeles, CA: Dept. of Physics, University of California, 1990.

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Propogation of high frequency jet noise using geometric acoustics. [Washington, DC: National Aeronautics and Space Administration, 1993.

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A, Krejsa E., and United States. National Aeronautics and Space Administration., eds. Propagation of high frequency jet noise using geometric acoustics. [Washington, DC: National Aeronautics and Space Administration, 1993.

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A, Krejsa E., and United States. National Aeronautics and Space Administration., eds. Propagation of high frequency jet noise using geometric acoustics. [Washington, DC]: National Aeronautics and Space Administration, 1993.

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Book chapters on the topic "High frequency sound"

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Brekhovskikh, Leonid M., and Oleg A. Godin. "High Frequency Sound Fields." In Springer Series on Wave Phenomena, 193–208. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-662-03889-5_5.

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Brekhovskikh, Leonid M., and Oleg A. Godin. "High Frequency Sound Fields." In Springer Series on Wave Phenomena, 179–93. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-662-02776-9_5.

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Farmer, David M., and Sherman R. Waddell. "High Frequency Ambient Sound in the Arctic." In Sea Surface Sound, 555–63. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-3017-9_40.

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Farmer, D. M., and S. Vagle. "Observations of High Frequency Ambient Sound Generated by Wind." In Sea Surface Sound, 403–15. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-3017-9_29.

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Ayton, Lorna. "High-Frequency Sound Generated by Sound-Aerofoil Interaction in Subsonic Uniform Flow." In Asymptotic Approximations for the Sound Generated by Aerofoils in Unsteady Subsonic Flows, 11–62. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19959-7_2.

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Kolaini, Ali R., Ronald A. Roy, and Lawrence A. Crum. "The Production of High-Frequency Ambient Noise by Capillary Waves." In Natural Physical Sources of Underwater Sound, 407–18. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1626-8_32.

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Liu, Bocheng, and Xiaoman Wang. "Indoor Navigation System Based on Sub High Frequency Sound Wave." In Advances in Intelligent Systems and Computing, 704–10. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-98776-7_81.

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Yang, Liang, Xiaohong Kuang, Shuo Zhang, and Haiyan Zhang. "Middle and High Frequency Sound Attenuation Optimization of Air Cleaner." In Lecture Notes in Electrical Engineering, 197–207. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-33832-8_15.

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Furduev, A. V. "On Cosmic Radiation Possible Contribution in Dead Calm High Frequency Ocean Noise Formation." In Natural Physical Sources of Underwater Sound, 711–20. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1626-8_53.

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Garrett, Steven L. "Attenuation of Sound." In Understanding Acoustics, 673–98. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44787-8_14.

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Abstract We will capitalize on our understanding of thermoviscous loss to develop an understanding of the attenuation of sound waves in fluids that are not influenced by proximity to solid surfaces. Such dissipation mechanisms are particularly important at very high frequencies and short distances (for ultrasound) or very low frequencies over geological distances (for infrasound). The Standard Linear Model of viscoelasticity introduced the nondimensional frequency, ωτR, that controlled the medium’s elastic (in-phase) and dissipative (quadrature) responses. Those response curves were “universal” in the sense that causality linked the elastic and dissipative responses through the Kramers-Kronig relations. That relaxation-time perspective is essential for attenuation of sound in media that can be characterized by one or more relaxation times related to those internal degrees of freedom that make their equation of state a function of frequency. Examples of these relaxation-time effects include the rate of collisions between different molecular species in a gas (e.g., nitrogen and water vapor in air), the pressure dependence of ionic association-dissociation of dissolved salts in sea water (e.g., MgSO4 and H3BO3), and evaporation-condensation effects when a fluid is oscillating about equilibrium with its vapor (e.g., fog droplets in air or gas bubbles in liquids).
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Conference papers on the topic "High frequency sound"

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Destgeer, Ghulam, Anas Alazzam, and Hyung Jin Sung. "Ultra-High Frequency Sound Waves for Microparticle Separation." In ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ajkfluids2015-18682.

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In this study, we have demonstrated a particle separation device taking advantage of the ultra-high frequency sound waves. The sound waves, in the form of surface acoustic waves, are produced by an acoustofluidic platform build on top of a piezoelectric substrate bonded to a microfluidic channel. The particles’ mixture, pumped through the microchannel, is focused using a sheath fluid. A travelling surface acoustic wave (TSAW), propagating normal to the flow, interacts with the particles and deflect them from their original path to induce size-based separation in a continuous flow. We initially started the experiment with 40 MHz TSAWs for deflecting 10 μm diameter polystyrene particles but failed. However, larger diameter particles (∼ 30 μm) were successfully deflected from their streamlines and separated from the smaller particles (∼ 10 μm) using TSAWs with 40 MHz frequency. The separation of smaller diameter particles (3, 5 and 7 μm) was also achieved using an order of magnitude higher-frequency (∼ 133 MHz) TSAWs.
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Robertson, Ian, Matthew Padaon, and Manoj Thota. "Liquid Applied Sound Damping for High Frequency Vibrations." In Noise and Vibration Conference & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2021. http://dx.doi.org/10.4271/2021-01-1123.

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Demeure, C. J. "A new modem for high quality sound broadcasting at short waves." In 7th International Conference on High Frequency Radio Systems and Techniques. IEE, 1997. http://dx.doi.org/10.1049/cp:19970759.

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Cook, Bill D. "Measurement of high frequency sound fields by optical techniques." In Vibration Measurements by Laser Techniques: First International Conference, edited by Enrico P. Tomasini. SPIE, 1994. http://dx.doi.org/10.1117/12.185330.

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Dahl, Peter H. "High Frequency Noise Emitted from Ocean Breaking Waves." In Proceedings of the III International Meeting on Natural Physical Processes Related to Sea Surface Sound. WORLD SCIENTIFIC, 1996. http://dx.doi.org/10.1142/9789814447102_0012.

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Zhang, Liang, Xiao Yuan Li, and Chun Xia Meng. "Modeling of High Frequency Sound Propagation Characteristics in Shallow Sea." In 2020 IEEE International Conference on Signal Processing, Communications and Computing (ICSPCC). IEEE, 2020. http://dx.doi.org/10.1109/icspcc50002.2020.9259498.

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Kopiev, V., and S. Chernyshev. "Sound radiation by high frequency oscillations of the vortex ring." In 15th Aeroacoustics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1993. http://dx.doi.org/10.2514/6.1993-4362.

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Glegg, Stewart. "High Frequency Sound Radiation From Fans With Transonic Tip Speeds." In 11th AIAA/CEAS Aeroacoustics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.2005-2879.

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Sabirov, Leonard M., and Ya T. Turakulov. "Negative dispersion of high-frequency sound velocity in water solutions of nonelectrolytes." In 13th Symposium and School on High-Resolution Molecular Spectroscopy, edited by Leonid N. Sinitsa. SPIE, 2000. http://dx.doi.org/10.1117/12.375386.

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Takagawa, Shinichi. "Small High Frequency Powerful Vibrator and its Application to Underwater Sound Generator." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-10265.

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The author has developed a small and powerful high frequency cam-type vibrator using roller thrust bearings with uneven races. The diameter of the vibrator is nearly the same as the outer diameter of the thrust bearing, and it is very small compared with other vibrators. This vibrator can be installed at the bottom end of a drill string as a high frequency vibro-hammering gear. Although the amplitude of the axial displacement is fixed, combination of two vibrators of this type can make the amplitude variable by superimposition. This variable superimposition can also be used as an On-Off switch of the vibration. The underwater sound used for seismic survey is usually a short pulse with a duration of several to several tens of milliseconds. The vibrator described in this paper is capable of generating such short sound pulses owing to the variable superimposition. Present sound generators for seismic survey are usually big and heavy and generate sound pulses with a wide frequency spectrum, centered around 100Hz. The cam-type vibrator described in this research is much smaller and lighter than present systems, making the deployment near the seafloor easy for even at great depths, which in return leads to more detailed results in stratum surveys. The emitted sound is a pure tone whose frequency can be anywhere between 100 and 1000Hz. The author has tried to develop this type of sound generator under the support of JOGMEC (Japan Oil, Gas and Metals National Corporation). In this paper, the principle of the vibration, the design of the sound generator and the result of the experiment shall be discussed.
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Reports on the topic "High frequency sound"

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Thorsos, Eric I., Kevin L. Williams, Dajun Tang, and Steven G. Kargl. High-Frequency Sound Interaction in Ocean Sediments. Fort Belvoir, VA: Defense Technical Information Center, September 2003. http://dx.doi.org/10.21236/ada628566.

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Thorsos, Eric I., Kevin L. Williams, Darrell R. Jackson, and Dajun Tang. High-Frequency Sound Interaction in Ocean Sediments. Fort Belvoir, VA: Defense Technical Information Center, September 2001. http://dx.doi.org/10.21236/ada625470.

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Thorsos, Eric I., Kevin L. Williams, Darrell R. Jackson, and Dajun Tang. High-Frequency Sound Interaction in Ocean Sediments. Fort Belvoir, VA: Defense Technical Information Center, August 2002. http://dx.doi.org/10.21236/ada627152.

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Nystuen, Jeffrey A. Monitoring the Ocean Using High Frequency Ambient Sound. Fort Belvoir, VA: Defense Technical Information Center, October 2008. http://dx.doi.org/10.21236/ada487219.

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Richardson, Michael, and Kevin Briggs. High-Frequency Sound Interaction in Ocean Sediments: Modeling Environmental Controls. Fort Belvoir, VA: Defense Technical Information Center, September 2003. http://dx.doi.org/10.21236/ada629546.

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Richardson, Michael, Kevin Briggs, Dawn Lavoie, and Dale Bibee. High-Frequency Sound Interaction in Ocean Sediments: Modeling Environmental Controls. Fort Belvoir, VA: Defense Technical Information Center, September 1999. http://dx.doi.org/10.21236/ada630779.

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Richardson, Michael, and Kevin Briggs. High-Frequency Sound Interaction in Ocean Sediments: Modeling Environmental Controls. Fort Belvoir, VA: Defense Technical Information Center, September 2001. http://dx.doi.org/10.21236/ada625526.

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Richardson, Michael, and Kevin Briggs. High-Frequency Sound Interaction in Ocean Sediments: Modeling Environmental Controls. Fort Belvoir, VA: Defense Technical Information Center, September 2002. http://dx.doi.org/10.21236/ada627189.

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Rubio, Anna, Emma Reyes, Carlo Mantovani, Lorenzo Corgnati, Pablo Lorente, Lohitzune Solabarrieta, Julien Mader, et al. European High Frequency Radar network governance. EuroSea, May 2021. http://dx.doi.org/10.3289/eurosea_d3.4.

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This report describes the governance of the European HF radar network including: the landscape of the Ocean observation networks and infrastructures, the role and links between operators of observational systems and stakeholders, the role and activities of the EuroGOOS HF radar Task Team in building a sound community strategy, the roadmap of the community with current achievements and future work lines.
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Nystuen, Jeffrey A. Monitoring Sea Surface Processes Using the High Frequency Ambient Sound Field. Fort Belvoir, VA: Defense Technical Information Center, September 2006. http://dx.doi.org/10.21236/ada612581.

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