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Keywords = hypersound

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16 pages, 2875 KB  
Article
Nanoscale Structural Phase Transitions in Aqueous Solutions of Organic Molecules
by Nikolai Bunkin, Leonard Sabirov, Denis Semenov, Faxriddin Ismailov and Muxriddin Khasanov
Condens. Matter 2023, 8(3), 64; https://doi.org/10.3390/condmat8030064 - 26 Jul 2023
Cited by 2 | Viewed by 1886
Abstract
Adiabatic compressibility βS of the 4-methylpyridine + water solution is investigated in a wide concentration and temperature variation interval using Mandelstam–Brillouin scattering spectroscopy. The adiabatic compressibility minimum caused by the microinhomogeneous structure of the solution is experimentally established at the concentration of [...] Read more.
Adiabatic compressibility βS of the 4-methylpyridine + water solution is investigated in a wide concentration and temperature variation interval using Mandelstam–Brillouin scattering spectroscopy. The adiabatic compressibility minimum caused by the microinhomogeneous structure of the solution is experimentally established at the concentration of 0.06 molar fractions of 4-methylpyridine in the solution. The results of the investigations allow the construction of a diagram of possible states caused by a continuous three-dimensional hydrogen bond network of water. The results of experimental study of the excessive hypersound absorption in acetone + water and 3-methylpyridine + water solutions are discussed based on the conclusions of the theory of high-frequency sound scattering near the critical point (developed by Chaban) and the Landau theory. These results are described within the framework of the Landau and Chaban theories and explained by the existence of two different states with minimum thermodynamic stability in the solution. Full article
(This article belongs to the Special Issue Physics of Light-Matter Coupling in Nanostructures)
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4 pages, 560 KB  
Article
Safety of the Hypersound® Audio System in Subjects with Normal Hearing
by Ritvik P. Mehta, Sara L. Mattson, Brian A. Kappus and Robin L. Seitzman
Audiol. Res. 2015, 5(2), 136; https://doi.org/10.4081/audiores.2015.136 - 20 Nov 2015
Viewed by 885
Abstract
The objective of the study was to assess the safety of the HyperSound® Audio System (HSS), a novel audio system using ultrasound technology, in normal hearing subjects under normal use conditions; we considered preexposure and post-exposure test design. We investigated primary and secondary [...] Read more.
The objective of the study was to assess the safety of the HyperSound® Audio System (HSS), a novel audio system using ultrasound technology, in normal hearing subjects under normal use conditions; we considered preexposure and post-exposure test design. We investigated primary and secondary outcome measures: i) temporary threshold shift (TTS), defined as >10 dB shift in pure tone air conduction thresholds and/or a decrement in distortion product otoacoustic emissions (DPOAEs) >10 dB at two or more frequencies; ii) presence of new-onset otologic symptoms after exposure. Twenty adult subjects with normal hearing underwent a pre-exposure assessment (pure tone air conduction audiometry, tympanometry, DPOAEs and otologic symptoms questionnaire) followed by exposure to a 2-h movie with sound delivered through the HSS emitter followed by a post-exposure assessment. No TTS or new-onset otological symptoms were identified. HSS demonstrates excellent safety in normal hearing subjects under normal use conditions. Full article
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