Subjects -> PHYSICS (Total: 857 journals)
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    - MECHANICS (22 journals)
    - NUCLEAR PHYSICS (53 journals)
    - OPTICS (92 journals)
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    - SOUND (25 journals)
    - THERMODYNAMICS (30 journals)

SOUND (25 journals)

Showing 1 - 22 of 22 Journals sorted alphabetically
Acoustical Physics     Hybrid Journal   (Followers: 13)
Acoustics     Open Access   (Followers: 4)
Acoustics Australia     Hybrid Journal   (Followers: 1)
Acoustics Today     Hybrid Journal   (Followers: 9)
Acta Acustica     Open Access   (Followers: 4)
Advances in Acoustics and Vibration     Open Access   (Followers: 48)
Applied Acoustics     Hybrid Journal   (Followers: 36)
Archives of Acoustics     Open Access   (Followers: 22)
Australasian Journal of Ultrasound in Medicine (AJUM)     Hybrid Journal   (Followers: 2)
Bioacoustics : The International Journal of Animal Sound and its Recording     Partially Free   (Followers: 5)
Building Acoustics     Hybrid Journal   (Followers: 4)
Bulletin de l'AFAS     Open Access   (Followers: 1)
Journal of Sound and Vibration     Hybrid Journal   (Followers: 161)
Journal of the Acoustical Society of America     Full-text available via subscription   (Followers: 58)
Journal of Ultrasonography     Open Access   (Followers: 1)
Journal of Ultrasound in Medicine     Full-text available via subscription   (Followers: 12)
Open Journal of Acoustics     Open Access   (Followers: 23)
Phonica     Open Access  
Proceedings of Meetings on Acoustics     Open Access   (Followers: 14)
Sonography     Hybrid Journal   (Followers: 1)
SoundEffects - An Interdisciplinary Journal of Sound and Sound Experience     Open Access   (Followers: 4)
Ultrasound International Open     Open Access   (Followers: 2)
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Journal Cover
Acoustical Physics
Journal Prestige (SJR): 0.359
Citation Impact (citeScore): 1
Number of Followers: 13  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1562-6865 - ISSN (Online) 1063-7710
Published by Springer-Verlag Homepage  [2467 journals]
  • A Biological Sensor Based on the Acoustic Slot Mode Using Microbial Cells
           for the Determination of Ampicillin

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      Abstract: A biological sensor for the determination of ampicillin in conductive solutions is presented. The sensor is based on an acoustic slot mode in a structure consisting of two lithium niobate piezoplates of different cuts separated by an air gap. One of the piezoplates serves as the bottom of a liquid container into which a suspension of microbial cells sensitive to the antibiotic under study is introduced. The depth of resonant peaks in the frequency response of the total loss of the sensor is measured. After that, the studied antibiotic is added to the container and the measurements are repeated. An analytical signal indicating the appearance of an antibiotic in the cell suspension is the change in the depth of resonance peaks after it is added to the container.
      PubDate: 2022-12-01
       
  • The Cavitation Activity of Aqueous Suspensions of Porous Silicon
           Nanoparticles with Different Degrees of Surface Hydrophobicity

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      Abstract: The dependence of acoustic cavitation thresholds in aqueous suspensions of porous silicon nanoparticles (pSiNPs) on the degree of hydrophobicity of their surface has been studied. Nanoparticles with an average size of 100 nm were prepared by mechanical grinding of porous silicon (pSi) films in ethanol. According to IR spectroscopy data, such pSiNPs are initially characterized by a hydrophilic surface. To obtain amphiphilic (hydrophobic–hydrophilic) nanoparticles, pSi films were hydrophobized before grinding by surface modification with octadecylsilane. When hydrophobic pSi films are ground in ethanol to nanoparticles, silicon–silicon bonds are broken, followed by their oxidation, due to which the surface is partially hydrophilized. It has been shown that the threshold of acoustic cavitation in suspensions of amphiphilic pSiNPs is significantly reduced compared to that of hydrophilic pSiNPs. The threshold value of acoustic cavitation in a suspension of amphiphilic nanoparticles at a concentration of 1 mg/mL remained almost constant for 5 days. The results obtained are important for the development of methods for sonodynamic therapy of cancer using pSiNPs.
      PubDate: 2022-12-01
       
  • Convexity and Concavity Control of Laser Beam Using a Frequency Modulated
           Acoustic Wave

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      Abstract: Abstract The transformation of Gaussian beam into a flat top one is realized by interaction of laser beam with two perpendicular sinusoidal ultrasonic waves operating in Raman–Nath regime. In this paper we propose, theoretically demonstrate and numerically illustrate a convex-concave beam, having the same principle of flat top one, using a frequency-modulated ultrasonic wave. The novelty of this beam is that its intensity varies periodically and regularly as function of time. Furthermore, the amplitude and the frequency of this variation can be controlled, easily by acting on the frequency excursion and modulating signal frequency respectively. Finally, the change in intensity between the centre and the edges of beam will enable to find promising results in future.
      PubDate: 2022-12-01
       
  • Analysis of Secondary Sound Emission in an Acoustic Analogy with a
           Propagation Operator Containing Vortex Modes

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      Abstract: In this paper, we analyze the acoustic analogy method in relation to the sound radiation of a turbulent subsonic jet. This method of describing aerodynamic sound generation by turbulent flows is based on the use of a linear propagation operator with a random source on the right side. The main problem here is the choice of an effective way to separate the left side of the equation, which is responsible for the propagation of sound waves, and the right part, which is responsible for sound generation, so that the noise calculation result corresponds to experimental data and physical ideas about noise generation by turbulence. One of the unsolved problems of the approach, which is common in most acoustic analogies, is the problem of the so-called “shear noise” associated with the excitation of shear flow disturbances by sources and the additional contribution of these disturbances to sound radiation. It is still unclear whether the shear component of the noise is a reflection of real physical processes or is associated with the transformation of equations and inaccurate modeling of sources. Here, within the framework of the problem formulated above, we consider an acoustic analogy, in which the linearized Euler equations are used as the propagation operator. In this description, the propagation operator contains vortex modes, which leads to the appearance of a shear noise component that arises due to the pumping of vortex disturbances by the sources. When modeling sound sources, hypotheses about the quadrupole nature isotropy of sound sources, as well as the spatial uncorrelation of sound source production, are used. To validate the model, the measurement data of the sound emission of the jet using the azimuthal decomposition method are used. The comparison of the model and experiment indicates the absence of a shear component in the jet noise. This makes it possible to conclude that the idea of pumping linear vortex perturbations of the mean flow by nonlinear turbulent pulsations that is used in the considered acoustic analogy does not correspond to the real mechanism of noise generation by a turbulent jet. Possible causes of the discrepancy between the model and the data of acoustic measurements are analyzed. Possible ways of solving this problem, which make it possible to effectively separate the left side of the equation that is responsible for the propagation of sound waves and the right nonlinear part that is responsible for sound generation are considered.
      PubDate: 2022-12-01
       
  • Perturbations of Modal Attenuation Coefficients and Group Velocities due
           to Depth Variations along a Shallow-Water Acoustic Track

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      Abstract: Perturbations of attenuation coefficients and group velocities of acoustic modes is considered in a shallow-water waveguide with an inhomogeneous bottom relief. Explicit formulas are constructed for calculating the first and second derivatives of the aforementioned quantities with respect to the sea depth on the basis of the perturbation theory developed by the authors in previous publications. Application of the proposed formulas is illustrated by a model example. It is shown that they allow highly accurate approximation of depth dependences for group velocities and modal attenuation coefficients. The proposed formulas can be used to obtain simple analytic estimates of acoustic propagation loss in irregular waveguides, as well as to allow for inhomogeneities of the bottom relief in geoacoustic inversion according to the data on waveguide dispersion of signals.
      PubDate: 2022-12-01
       
  • Effect of Intermodal Correlations on the Efficiency of the Spatial
           Processing of Acoustic Signals in an Oceanic Waveguide with a Perturbed
           Surface

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      Abstract: The effect of intermodal correlations on the efficiency of the spatial processing of a signal in oceanic waveguides with a perturbed surface is studied. An algorithm of calculating the correlation matrix of a signal on the aperture of a horizontal antenna array with allowance for the interferential structure of an acoustic field in the sound channel is proposed. The antenna gain factor is analyzed for three spatial-processing methods, such as the standard phased antenna array, optimal linear processing, and optimal quadratic optimization techniques. The results of numerical modeling for the hydrological conditions of the Barents Sea in the winter period are given. Particular attention is paid to interferential oscillations in the gain factor of an antenna array and the dependence of its values “smoothened” at the scale of the interferential structure of an acoustic field in a waveguide on the problem parameters.
      PubDate: 2022-12-01
       
  • Models and Methods for Scalar Wave Filtration of Fields of Wall Turbulent
           Pressure Fluctuations

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      Abstract: The notion of the scalar wavenumber-frequency spectrum of wall pressures is introduced, and its principal specific features are considered. A scalar wavenumber frequency spectrum representing the overall energy of all the wave component of a field of turbulent pressures with a specified wave vector module contains the brief information required for the solution of many problems of aerohydrodynamic acoustics. It is shown that loop filters enable the estimation of a wavenumber-frequency spectrum in the region of small wavenumbers. Despite the difficulty in practical implementation of scalar wave filtration of fields of turbulent pressure fluctuations, the construction of loop filters currently seems to be a promising trend of studies. The proposed methods and the results obtained in this study show that the broadband scalar wave filtration of a field of wall pressures may be performed on the basis of finite-size approximations of an “ideal” scalar wave filter with unit wave sensitivity within a specified range of wavenumbers and zero sensitivity outside this range.
      PubDate: 2022-12-01
       
  • A Correlation Method for Acoustic Sources Identification Using
           Multiple-Microphone Measurements

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      Abstract: A method for determining the source field by data of multiple-microphone measurements is developed. The method is based on the correlation analysis of acoustic fields. Under the assumption of delta-correlation of the source field, this approach allows the mathematical statement of the inverse problem to be fundamentally altered so that the problem becomes properly posed. In particular, this method allows simultaneously recognizing monopole and dipole components of the source field using measurements by a planar microphone array. The method is verified numerically using various test examples of simultaneous recognition of monopole and dipole components of the source field.
      PubDate: 2022-12-01
       
  • Acoustic Fields and Radiation Forces Induced by a Standing Surface Wave in
           Layered Viscous Media

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      Abstract: — Calculations are performed for the fields, amplitude, and dispersion characteristics of a surface acoustic wave in the “viscous fluid half-space–solid half-space” and “viscous fluid layer–elastic half-space” systems taken into account the shear components in the fluid. The resulting radiation pressure is calculated, which occurs in a viscous fluid layer under the impact of a standing surface wave and acts on the elementary fluid volume due to the nonlinearity of the equations of motion in single- and two-mode regimes. It is shown that viscosity results in a violation in the perfect periodicity and symmetry of the fields of the radiation forces and acoustic streaming. The shear components result in considerable radiation pressure forces localized in a narrow domain in the vicinity of the interface. The excitation of several wave modes in a system makes it possible to generate complex spatial distributions of radiation force fields. Then controlling the wave frequency and the layer thickness, one can reach either the predominance of the single-mode field or a comparable contribution of several modes. The fundamental mode is predominant in the vicinity of a wave resonance.
      PubDate: 2022-12-01
       
  • Synthesis of Bulk-Acoustic-Wave Bandpass Filters Taking into Account the
           Material Parameters of the Resonators Mulilayer Structure

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      Abstract: The article proposes a method for synthesizing Chebyshev bandpass filters (BPFs), based on bulk-acoustic-wave resonators, taking into account the influence of electromechanical parameters of all layers of multilayer resonators. Classical synthesis of a prototype filter with additional reactive elements makes it possible to formulate requirements on the frequency properties of the resonators in a BPF in order to obtain uniform ripple in the transmission band. The method is supplemented by an analytical model of the input impedance of the bulk-acoustic-wave resonators, which takes into account the electroacoustic structural parameters, derived from an experimental study of test resonators. A third-order bandpass filter based on bulk acoustic resonators is synthesized as a multilayer structure, acoustically isolated from the substrate.
      PubDate: 2022-12-01
       
  • The Use of Graphic Accelerators in Simulation of Nonlinear Ultrasonic
           Beams with Shock Fronts on the Basis of the Westerwelt Equation

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      Abstract: The problem of accelerating the algorithm for calculating nonlinear effects is considered, when modeling high-intensity ultrasonic beams based on the one-way Westervelt equation. When constructing a numerical solution for strongly distorted waves with shock fronts, it is necessary to take into account large number of harmonics (up to 1000) on spatial grids with a matrix size of the order of 10 000 by 10 000, which requires the processing of large amounts of data and a long calculation time. In this paper, the implementation of the nonlinearity operator is carried out in a time representation using a Godunov-type shock-catching scheme, which allows modeling nonlinear waves with shock fronts with a small (3) number of grid nodes on the shock front. The paper compares the efficiency of using this method when it is implemented on central processing units (CPUs) and graphics processing units (GPUs) in comparison with the spectral method implemented earlier for quasi-linear wave propagation. An analysis is made of the speed of algorithm execution on the CPU and GPU, depending on the size of the input data arrays.
      PubDate: 2022-12-01
       
  • Source Localization in a Range-Dependent Waveguide with Incomplete
           Information on Spatial Variability of the Propagation Medium

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      Abstract: The problem of acoustic source localization in a range-dependent waveguide with interaction of normal waves, which leads to their amplitude coupling, is considered. For the given scenario, an adaptive reduced-rank algorithm is constructed, taking into account the difference between the expected signal replica and the true one and does not require knowledge of the corresponding coupling elements. By statistical modeling, it is found that the proposed estimation method gives a significant advantage both in the accuracy of coordinate measurement and in the probability of correct localization compared to the traditional MUSIC method, which does not take into account the effects of mode interaction.
      PubDate: 2022-12-01
       
  • The Influence of Microcracking Degree of Feldspars on the Spectral Power
           of Backscattered Broadband Pulses of Longitudinal Ultrasonic Waves

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      Abstract: In this work, we study the influence of microcracks in laboratory samples of feldspars on the spectral power of broadband pulses of longitudinal ultrasonic waves backscattered in a studied sample (so-called “structural noise power”). An optoacoustic transducer is used for this purpose, which combines laser excitation of probe broadband ultrasonic pulses in a black polyethylene film and piezoelectric detection of both probe pulses and those scattered in the sample. The orthoclase and plagioclase samples with the zones of the microcrack agglomerations nonuniformly distributed over the sample volume are studied. These zones were found using optical microscopy of the sample surface, as well as using the data of measurements of the attenuation coefficient of longitudinal ultrasonic waves in the 1–15 MHz frequency range. The zones with a higher ultrasonic attenuation exhibited an increased structural noise power. The revealed correlation between the concentration of microcracks and the structural noise power can serve as a basis for the development of a technique of nondestructive optoacoustic monitoring of the occurrence and evolution of local microcracks in samples of rocks and minerals under various external loadings.
      PubDate: 2022-12-01
       
  • Effect of the Electrical Conductivity of a Film on the Characteristics of
           an Radial Electric Field Excited Acoustic Resonator

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      Abstract: The results of a study of the influence of the electrical conductivity of a thin film deposited on the free end of a radial electric field excited acoustic resonator field or located in its immediate vicinity on the resonator characteristics are presented. Three situations were considered: there is no conductive film, the film is deposited directly on the resonator free end, and the film is located at a short distance from the resonator free end. In all three cases, the electrical impedance of the resonator was calculated and measured in a wide frequency range of 1–1500 kHz. For the first time, the material constants of piezoceramics were refined for a free and short-circuited resonator and it was shown that these constants coincide with each other with good accuracy. It is shown that a decrease in the resonator thickness and an increase in the gap between the electrodes increase its sensitivity to the presence of a conductive film at a short distance from the resonator end.
      PubDate: 2022-12-01
       
  • Nonlinear Localized Longitudinal Waves in a Metamaterial Designed as a
           “Mass-In-Mass” Chain

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      Abstract: Abstract The article considers a mathematical model of an acoustic (mechanical) metamaterial, which is a chain of oscillators consisting of nonlinear elastic elements and masses, each of which contains an internal nonlinear oscillator. It is shown that, in the long-wavelength approximation, the resulting system of equations can be reduced to the Benjamin–Bon–Mahoney nonlinear evolutionary equation, in the framework of which interaction of three modulated quasi-harmonic waves (wave packets) is studied under the phase matching conditions. We investigate the formation of coupled three-frequency envelope solitons, i.e., wave packets that retain their amplitude–phase profiles as they propagate in the metamaterial due to the compensating effect of nonlinear effects. It is noted that in addition to solutions describing quasi-harmonic processes, the resulting evolutionary equation has an exact analytical solution in the form of a solitary stationary wave (soliton). Differences in the properties of this soliton and the classical Korteweg–de Vries soliton are revealed.
      PubDate: 2022-10-01
      DOI: 10.1134/S1063771022040030
       
  • Effect of Ammonia on the Resonance Properties of a Piezoelectric Resonator
           with a Lateral Electric Field–Chitosan Film Structure

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      Abstract: The parameters of a resonator with a lateral electric field with a thin film of chitosan acetate and chitosan glycolate in an air–ammonia mixture have been studied. It is shown that when the ammonia concentration increases, the maximum value of the real part of the impedance and resonance frequency of the resonance peaks decrease significantly and recover in air. It is established that these effects are associated with an increase in the surface conductivity of the films in the presence of ammonia. In this case, the response and relaxation times for these chitosan films differ significantly.
      PubDate: 2022-10-01
      DOI: 10.1134/S106377102205013X
       
  • Evaluations of the Annoyance Effects of Noise

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      Abstract: Abstract Noise is defined as audible sound that disrupts silence and causes annoyance. Such annoyance is traditionally assessed by the A-weighted sound pressure level of noise, roughly corresponding to the level of perceived loudness. However, the A-weighted scale is inapplicable for analyzing tonal, pulsed, and predominantly low-frequency noise; therefore, methods have been developed for calculating noise loudness in linear units, sones, which take into account not only auditory sensitivity, but also masking properties and auditory temporal effects. The existence of noise reduction limits and their informational significance have led to other methods for assessing noise annoyance. Annoyance, in addition to loudness, is caused by such subjective noise qualities as sharpness, roughness, fluctuation strength, tonality, etc. Units of measurements have been defined for these and calculation methods developed. Taking such qualities into account, a metric of short-term psychoacoustic annoyance (PAA) has been proposed, which is valid for many types of noise. Another method for evaluating PAA includes conducting an auditory examination and constructing a mathematical model that relates the rank of auditory annoyance to the measured subjective qualities of the noise. The resulting model helps to identify the causes of annoyance (subjective annoying qualities); develop work plans aimed at noise suppression, the formation of pleasant noise by machines and mechanisms; and control changes in the rank of annoyance in the implementation of such plans. This paper compares different methods for assessing the annoyance caused by noise recorded in Moscow subway cars.
      PubDate: 2022-10-01
      DOI: 10.1134/S1063771022050098
       
  • Internal Thermal Effects in Axial Paratellurite-Based Acoustooptic
           Deflector

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      Abstract: The thermal angular deviation of the zero and working orders in an axial paratellurite-based acoustooptic deflector is experimentally investigated at a control power up to 6.5 W in the continuous mode. Regional measurements (near the transducer, in the middle, and at the sound absorber) are performed for variants of +1 and –1 working order diffraction and show a linear dependence of the angular deviation on the control power. A qualitative description of deviation of the working order as a combined action of two factors is proposed: (1) zeroth-order deviation at passage of two thermal optically denser prisms attached to the transducer and sound absorber and (2) reduction in the diffraction angle due to the growth in the sound speed at crystal heating. The inhomogeneity of the temperature field cannot be used to uniquely separate the contributions of these factors to the averaged working-order deviation. It is shown that the technology of the liquid contact between the endface surface of a piezoelectric transducer and the body increases the stability of the deflector parameters as light passes in the zone adjacent to the transducer. It is revealed that for +1 order diffraction there is a zone with a minimum thermal deviation between the piezoelectric transducer and the absorber. This is explained by the mutual compensation between the zeroth-order deviation (in the field of the thermal optical wedge from the absorber) and the factor of increased in sound speed.
      PubDate: 2022-10-01
      DOI: 10.1134/S1063771022050050
       
  • Comparison of the Theory with the Results of Measurements of Fluid
           Filtration Noise in a Porous Medium

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      Abstract: Abstract A method for remote studies of structurally inhomogeneous media is considered: study of filtration noise. A brief description of the previously proposed model for the occurrence of filtration noise is given. The results of calculations are presented, and the features of the internal structure of natural porous materials that govern the generation of acoustic emission, are noted. The calculation results are compared with experimental data recently published in the journal “Acoustical Physics”. Satisfactory agreement is demonstrated between prediction with the proposed theoretical model and measurement results. This opens up possibilities for determining the parameters of porous media and fluid velocity by measuring the filtration noise.
      PubDate: 2022-10-01
      DOI: 10.1134/S1063771022040054
       
  • Mode Coupling Due to a Local Inhomogeneity in a Shallow-Water Acoustic
           Waveguide in a Broad Frequency Band

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      Abstract: Abstract Analytically and by numerical simulation, we consider the effect of a local inhomogeneity on a broadband (50–250 Hz) sound field formed in a shallow-water (40 m) waveguide on a stationary track at a range of up to 5 km. Analytical estimates are obtained using mode coupling theory, and numerical simulation is carried out using the wide-angle parabolic equation. It is assumed that the sound source is a single omnidirectional emitter, and the receiving system is a vertical array spanning the entire waveguide over depth. As an inhomogeneity, a local change in thickness of the water layer or a internal wave soliton is chosen, the presence of which causes mode coupling. Analytical estimates and numerical simulation show that when there is a local inhomogeneity on the acoustic track, the frequency dependence of the mode amplitudes acquires a characteristic modulation, the period of which decreases in frequency domain with increasing of the distance from the sound source to the inhomogeneity. This effect can be used to determine the position of a local inhomogeneity on a stationary track.
      PubDate: 2022-10-01
      DOI: 10.1134/S1063771022050062
       
 
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