Study by means of liquid side acoustic barrier of the influence of leaky Rayleigh waves on bounded beam reflection
Nico F. Declercq and Ebrahim Lamkanfi
The Schoch effect in ultrasonics, when sound is incident at the Rayleigh angle on a liquid-solid interface, consists of a forward beam displacement of the reflected beam, usually accompanied by a null strip in between the specular portion and the nonspecular reflected beam portion. It is a widely ac ... [Appl. Phys. Lett. 93, 054103 (2008)] published Thu Aug 7, 2008.
Improved temperature stability in SAW resonator filters using multiple coupling paths
L. A. Coldren
An extension of the interfering delay path concept, put forth by Browning and Lewis, is used to provide temperature compensation within a class of two-section SAW resonator filters without adding significantly to to filter complexity. An example calculation shows that the temperature range DeltaT fo ... [Appl. Phys. Lett. 35, 678 (2008)] published Thu Aug 7, 2008.
Temperature-compensated PbTiO[sub 3] ceramics for surface acoustic wave applications
Yukio Ito, Hiroshi Takeuchi, Shigeru Jyomura, Kazuyuki Nagatsuma, and Sakichi Ashida
Lead titanate PbTiO ceramics with a zero temperature coefficient of surface wave delay time are developed by addition of NdO, InO, and MnO. These ceramics have very small temperature coefficients of less than 1 ppm/ degrees C over a wide temperature range (10+60 degrees C). They have a large elect ... [Appl. Phys. Lett. 35, 595 (2008)] published Thu Aug 7, 2008.
Surface-acoustic-wave plate convolvers at 1 GHz
R. D. Colvin and P. H. Carr
Convolution has been performed at 800 MHz and 1 GHz on Y cut, Z propagating and 38 degrees (rotated from +Z) cut, X propagating lithium niobate, respectively. No saturation of the convolved output was observed for an acoustic power of 178 mW/mm. An attenuation of 1.40.3 dB/[mu]sec due to a 500-A Al ... [Appl. Phys. Lett. 35, 522 (2008)] published Thu Aug 7, 2008.
Enhancement of convolution voltage due to transverse drift of carriers in piezoelectric semiconductor SAW convolvers
Shigetaka Matsumoto
The enhancement of the convolution voltage of piezoelectric surface acoustic wave (SAW) convolvers due to the transverse drift of carriers is predicted theoretically. The theoretical prediction is qualitatively in agreement with the result of experiments using photoconductive CdS samples. ... [Appl. Phys. Lett. 35, 520 (2008)] published Thu Aug 7, 2008.
A SAW/CCD programmable matched filter
R. W. Ralston, D. L. Smythe, and E. Stern
A charge-coupled device (CCD) has been integrated with a surface-acoustic-wave (SAW) piezoelectric delay line in a hybrid gap-coupled structure to produce an electronically programmable analog matched filter in which the filter function is controlled by the charge pattern clocked into the CCD. This ... [Appl. Phys. Lett. 35, 388 (2008)] published Thu Aug 7, 2008.
Acoustic microscopy of interior planes
V. B. Jipson
It has been recently demonstrated that the acoustic microscope can be used to image planes relatively deep beneath the surface with a lateral resolution of approximately one acoustic wavelength. In order to minimize the aberration effects caused by refraction at the liquid-solid interface, liquid ga ... [Appl. Phys. Lett. 35, 385 (2008)] published Thu Aug 7, 2008.
Efficient conversion of surface acoustic waves in shallow gratings to bulk plate modes
John Melngailis, H. A. Haus, and A. Lattes
Nearly 100% conversion of surface acoustic waves to bulk plate modes via gratings has been observed and characterized. The gratings constructed on YZ LiNbO had 200 grooves of 20-[mu]m period and 0.47-[mu]m depth. Surface acoustic waves with wavelengths near 20 [mu]m were normally incident on the gra ... [Appl. Phys. Lett. 35, 324 (2008)] published Thu Aug 7, 2008.
Edge-bonded surface-acoustic-wave transducer array
H. C. Tuan, G. S. Kino, B. T. Khuri-Yakub, and A. R. Selfridge
A new type of transducer array has been designed and built for imaging surface defects in metals such as aluminum. The array is formed by edge bonding a piece of piezoelectric material to a substrate of the same material as the sample to be tested. The individual elements in the array are formed by ... [Appl. Phys. Lett. 35, 320 (2008)] published Thu Aug 7, 2008.
SAW dispersion and film-thickness measurement by acoustic microscopy
R. D. Weglein
The reflection acoustic microscope has been used to measure SAW velocity dispersion and to indirectly measure the film thickness in a layered composite consisting of Au on a Si substrate. A quantitative thickness determination was made via the acoustic material signature technique, that is nondestru ... [Appl. Phys. Lett. 35, 215 (2008)] published Thu Aug 7, 2008.
Large-angle acoustic-beam steering in acoustically anisotropic crystal
E. G. Lean and W. H. Chen
We have demonstrated a unique scheme for electronically steering an acoustic beam over an angle large than 70 degrees in a TeO crystal. The idea is based on the principle that the acoustic energy flow direction is always normal to the slowness curve in an acoustically anisotropic crystal. In the pl ... [Appl. Phys. Lett. 35, 101 (2008)] published Thu Aug 7, 2008.
Frequency-crossing phonon spectrometer techniques
M. N. Wybourne, D. J. Jefferies, L. J. Challis, and A. A. Ghazi
An ac technique for measuring magnetothermal conductivities using frequency crossing has been developed and shows a 13-fold increase in signal-to-noise ratio over the conventional dc technique. The ac technique employs low-frequency field modulation coupled with phase-sensitive detection and a 45-fo ... [Rev. Sci. Instrum. 50, 1634 (2008)] published Wed Aug 6, 2008.
Composite torsional quartz transducer for shear ultrasonic measurements of aqueous liquids
Shigeki Mitaku, Koji Ohsawa, Akio Matoba, Toshiya Ohtsuki, and Koji Okano
A composite torsional quartz transducer has been developed for the shear ultrasonic measurements of aqueous solutions in the frequency range from 10 to 100 kHz. In order to prevent the electric interaction and low contact angle between the transducer and water, a torsional quartz crystal transducer ... [Rev. Sci. Instrum. 50, 1437 (2008)] published Wed Aug 6, 2008.
Multiparameter system for investigation of the effects of high-power ultrasound on metals
Richard B. Mignogna and Robert E. Green, Jr.
A multiparameter system has been developed which, for the first time, permits simultaneous measurement of sufficient quantities to test all of the proposed mechanisms for the influence of high-power ultrasound on metal specimens. Results of measurements using this system give new insight into the me ... [Rev. Sci. Instrum. 50, 1274 (2008)] published Wed Aug 6, 2008.
Automatic and simultaneous measurements of ultrasonic velocity and attenuation changes
Takashi Matsuda and Ichiro Hatta
A method is described for measuring ultrasonic velocity and attenuation simultaneously by sampling echo pulses along with the repetition rate of velocity measurements. This is achieved by extending the pulse superposition method. This system enables us to measure the attenuation coefficient with a p ... [Rev. Sci. Instrum. 50, 1239 (2008)] published Wed Aug 6, 2008.
Frequency multiplexer for ultrasonic Doppler blood flow signals
F. J. Thomson
An instrument is described which uses single-sideband techniques to combine two channels of Doppler flow signals into a form suitable for simultaneous processing by a single-channel real-time spectral analyzer. The maximum input frequency range is 50 Hz to 10 kHz. ... [Rev. Sci. Instrum. 50, 882 (2008)] published Wed Aug 6, 2008.
Broadband electrostatic acoustic transducer for ultrasonic measurements in liquids
John H. Cantrell, Jr., Joseph S. Heyman, W. T. Yost, M. A. Torbett, and M. A. Breazeale
A broadband capacitive electrostatic acoustic transducer (ESAT) has been developed for use in a liquid environment at megahertz frequencies. The ESAT basically consists of a thin conductive membrane stretched over a metallic housing. The membrane functions as the ground plate of a parallel plate cap ... [Rev. Sci. Instrum. 50, 31 (2008)] published Wed Aug 6, 2008.
Cavitation of a bubble in an inviscid compressible liquid, with comparisons to a viscous incompressible liquid
G. J. Lastman and R. A. Wentzell
A model of a bubble, consisting of an adiabatic gas surrounded by an inviscid compressible liquid with surface tension at the liquid-gas interface, is studied in order to explain experimental results not explained (or not adequately explained) by the viscous incompressible liquid model. The inviscid ... [Phys. Fluids 22, 2259 (2008)] published Wed Aug 6, 2008.
Reply to the comments of D. F. Parker
R. Ishii
In response to comments by Parker, it is claimed by Ishii that Parker's comments and corrections are based upon a misinterpretation and misunderstanding of Ishii's procedure. ... [Phys. Fluids 22, 2044 (2008)] published Wed Aug 6, 2008.
Comments on ''Wave fronts of nonlinear waves in a vibrationally relaxing gas''
D. F. Parker
By a slight modification of Ishii's procedure, it is shown that his recently derived results for weak shock propagation apply only when conditions behind the shock are nearly uniform. ... [Phys. Fluids 22, 2042 (2008)] published Wed Aug 6, 2008.
Sound-wave propagation in a rarefied gas
S. K. Loyalka and T. C. Cheng
The problem of sound wave propagation in a rarefied gas is studied by the use of the linearized BGK model and diffuse reflection boundary conditions. The relevant integrodifferental equation and boundary conditions for the half-space are converted to a system of linear integral equations, which is t ... [Phys. Fluids 22, 830 (2008)] published Wed Aug 6, 2008.
Noise reduction combining time-frequency epsilon-filter and M-transform
Tomomi Abe, Mitsuharu Matsumoto, and Shuji Hashimoto
This paper introduces noise reduction combining time-frequency epsilon-filter (TF epsilon-filter) and time-frequency M-transform (TF M-transform). Musical noise is an offensive noise generated due to noise reduction in the time-frequency domain such as spectral subtraction and TF epsilon-filter. It ... [J. Acoust. Soc. Am. 124, 994 (2008)] published Tue Aug 5, 2008.
Reliability of estimating the room volume from a single room impulse response
Martin Kuster
The methods investigated for the room volume estimation are based on geometrical acoustics, eigenmode, and diffuse field models and no data other than the room impulse response are available. The measurements include several receiver positions in a total of 12 rooms of vastly different sizes and aco ... [J. Acoust. Soc. Am. 124, 982 (2008)] published Tue Aug 5, 2008.
Verifying the attenuation of earplugs in situ: Method validation using artificial head and numerical simulations
Annelies Bockstael, Bram de Greve, Timothy Van Renterghem, Dick Botteldooren, Wendy D'Haenens et al.
The use of in situ measurements of hearing protectors' (HPD's) attenuation following the microphone in real ear (MIRE) protocol is increasing. The attenuation is hereby calculated from the difference in sound levels outside the ear and inside the ear canal behind the HPD. Custom-made earplugs have b ... [J. Acoust. Soc. Am. 124, 973 (2008)] published Tue Aug 5, 2008.
Noise reduction in tunnels by hard rough surfaces
Ming Kan Law, Kai Ming Li, and Chun Wah Leung
This paper examines the feasibility of using two-dimensional hard rough surfaces to reduce noise levels in traffic tunnels with perfectly reflecting boundaries. First, the Twersky boss model is used to estimate the acoustic impedance of a hard rough surface. Second, an image source model is then use ... [J. Acoust. Soc. Am. 124, 961 (2008)] published Tue Aug 5, 2008.
Fast affine projections and the regularized modified filtered-error algorithm in multichannel active noise control
J. M. Wesselink and A. P. Berkhoff
In this paper, real-time results are given for broadband multichannel active noise control using the regularized modified filtered-error algorithm. As compared to the standard filtered-error algorithm, the improved convergence rate and stability of the algorithm are obtained by using an innerouter f ... [J. Acoust. Soc. Am. 124, 949 (2008)] published Tue Aug 5, 2008.
Bottom-up approach for microstructure optimization of sound absorbing materials
Camille Perrot, Fabien Chevillotte, and Raymond Panneton
Results from a numerical study examining micro-/macrorelations linking local geometry parameters to sound absorption properties are presented. For a hexagonal structure of solid fibers, the porosity phi, the thermal characteristic length Lambda, the static viscous permeability k, the tortuosity alph ... [J. Acoust. Soc. Am. 124, 940 (2008)] published Tue Aug 5, 2008.
Nature of orchestral noise
Ian O'Brien, Wayne Wilson, and Andrew Bradley
Professional orchestral musicians are at risk of exposure to excessive noise when at work. This is an industry-wide problem that threatens not only the hearing of orchestral musicians but also the way orchestras operate. The research described in this paper recorded noise levels within a professiona ... [J. Acoust. Soc. Am. 124, 926 (2008)] published Tue Aug 5, 2008.
Defect detection and localization in orthotropic wood slabs by inversion of dynamic surface displacements
Anthony J. Romano, Joseph A. Bucaro, and Saikat Dey
The nondestructive evaluation inversion and generalized force-mapping techniques developed and demonstrated for isotropic thin plates by Bucaro et al. [(2004). Detection and localization of inclusions in plates using inversion of point actuated surface displacements, J. Acoust. Soc. Am. 115, 201206] ... [J. Acoust. Soc. Am. 124, 918 (2008)] published Tue Aug 5, 2008.
Nondestructive characterization of musical pillars of Mahamandapam of Vitthala Temple at Hampi, India
Anish Kumar, T. Jayakumar, C. Babu Rao, Govind K. Sharma, K. V. Rajkumar et al.
This paper presents the first scientific investigation on the musical pillars of the Vitthala Temple at Hampi, India. The solid stone columns in these pillars produce audible sound, when struck with a finger. Systematic investigations on the acoustic characteristics of the musical pillars of mahaman ... [J. Acoust. Soc. Am. 124, 911 (2008)] published Tue Aug 5, 2008.
Smart panel with active damping units. Implementation of decentralized control
Cristobal Gonzalez Diaz, Christoph Paulitsch, and Paolo Gardonio
This paper contains the second part of a study on a smart panel with five decentralized velocity feedback control units using proof mass electrodynamic actuators [Gonzalez Diaz et al., J. Acoust. Soc. Am. 124, 886 (2008)]. The implementation of five decentralized control loops is analyzed, both theo ... [J. Acoust. Soc. Am. 124, 898 (2008)] published Tue Aug 5, 2008.
Active damping control unit using a small scale proof mass electrodynamic actuator
Cristobal Gonzalez Diaz, Christoph Paulitsch, and Paolo Gardonio
This paper presents a study on the design and use of a small scale proof mass electrodynamic actuator, with a low mounting resonance frequency, for velocity feedback control on a thin rectangular panel. A stability-performance formula is derived, which can be effectively used to assess the down scal ... [J. Acoust. Soc. Am. 124, 886 (2008)] published Tue Aug 5, 2008.
Edge resonance in semi-infinite thick pipe: Numerical predictions and measurements
M. Ratassepp, A. Klauson, F. Chati, F. Leon, and G. Maze
This paper presents theoretical and experimental studies of axisymmetric longitudinal guided wave L(0,2) interaction with the free edge of the pipe. A numerical method based on normal mode superposition is applied to predict the edge resonance by an analysis of dispersion relations of separate modes ... [J. Acoust. Soc. Am. 124, 875 (2008)] published Tue Aug 5, 2008.
Guided wave propagation and mode differentiation in hollow cylinders with viscoelastic coatings
Jing Mu and Joseph L. Rose
Guided wave propagation theories have been widely explored for about one century. Earlier theories on single-layer elastic hollow cylinders have been very beneficial for practical nondestructive testing on piping and tubing systems. Guided wave flexural (nonaxisymmetric) modes in cylinders can be ge ... [J. Acoust. Soc. Am. 124, 866 (2008)] published Tue Aug 5, 2008.
Ultrasound attenuation estimation using backscattered echoes from multiple sources
Timothy A. Bigelow
The objective of this study was to devise an algorithm that can accurately estimate the attenuation along the propagation path (i.e., the total attenuation) from backscattered echoes. It was shown that the downshift in the center frequency of the backscattered ultrasound echoes compared to echoes ob ... [J. Acoust. Soc. Am. 124, 1367 (2008)] published Tue Aug 5, 2008.
The inner ears of Northern Canadian freshwater fishes following exposure to seismic air gun sounds
Jiakun Song, David A. Mann, Peter A. Cott, Bruce W. Hanna, and Arthur N. Popper
An earlier study examined the effects of exposure to seismic air guns on the hearing of three species of fish from the Mackenzie River Delta in Northern Canada [Popper et al. (2005). Effects of exposure to seismic airgun use on hearing of three fish species, J. Acoust. Soc. Am. 117, 39583971]. The s ... [J. Acoust. Soc. Am. 124, 1360 (2008)] published Tue Aug 5, 2008.
Temporal scales of auditory objects underlying birdsong vocal recognition
Timothy Q. Gentner
Vocal recognition is common among songbirds, and provides an excellent model system to study the perceptual and neurobiological mechanisms for processing natural vocal communication signals. Male European starlings, a species of songbird, learn to recognize the songs of multiple conspecific males by ... [J. Acoust. Soc. Am. 124, 1350 (2008)] published Tue Aug 5, 2008.
Low frequency vocalizations attributed to sei whales (Balaenoptera borealis)
Mark F. Baumgartner, Sofie M. Van Parijs, Frederick W. Wenzel, Christopher J. Tremblay, H. Carter Esch et al.
Low frequency (<100 Hz) downsweep vocalizations were repeatedly recorded from ocean gliders east of Cape Cod, MA in May 2005. To identify the species responsible for this call, arrays of acoustic recorders were deployed in this same area during 2006 and 2007. 70 h of collocated visual observations ... [J. Acoust. Soc. Am. 124, 1339 (2008)] published Tue Aug 5, 2008.
Courtship and agonistic sounds by the cichlid fish Pseudotropheus zebra
J. Miguel Simoes, Ines G. Duarte, Paulo J. Fonseca, George F. Turner, and M. Clara Amorim
Courtship and agonistic interactions in an African cichlid species present a richer diversity of acoustic stimuli than previously reported. Male cichlids, including those from the genus Pseudotropheus (P.), produce low frequency short pulsed sounds during courtship. Sounds emitted by P. zebra males ... [J. Acoust. Soc. Am. 124, 1332 (2008)] published Tue Aug 5, 2008.
Influence of wall vibrations on the behavior of a simplified wind instrument
Guillaume Nief, Francois Gautier, Jean-Pierre Dalmont, and Joel Gilbert
The issue of the influence of wall vibrations on the behavior of wind instruments is still under debate. The mechanisms of vibroacoustic couplings involved in these vibrations are difficult to investigate, as fluid-structure interactions are weak. Among these vibroacoustic interactions, the present ... [J. Acoust. Soc. Am. 124, 1320 (2008)] published Tue Aug 5, 2008.
Segregation of unvoiced speech from nonspeech interference
Guoning Hu and DeLiang Wang
Monaural speech segregation has proven to be extremely challenging. While efforts in computational auditory scene analysis have led to considerable progress in voiced speech segregation, little attention has been given to unvoiced speech, which lacks harmonic structure and has weaker energy, hence m ... [J. Acoust. Soc. Am. 124, 1306 (2008)] published Tue Aug 5, 2008.
The effect of age on auditory spatial attention in conditions of real and simulated spatial separation
Gurjit Singh, M. Kathleen Pichora-Fuller, and Bruce A. Schneider
The contributions of auditory and cognitive factors to age-dependent differences in auditory spatial attention were investigated. In conditions of real spatial separation, the target sentence was presented from a central location and competing sentences were presented from left and right locations. ... [J. Acoust. Soc. Am. 124, 1294 (2008)] published Tue Aug 5, 2008.
Perception of silent-center syllables by native and non-native English speakers
Catherine L. Rogers and Alexandra S. Lopez
The amount of acoustic information that native and non-native listeners need for syllable identification was investigated by comparing the performance of monolingual English speakers and native Spanish speakers with either an earlier or a later age of immersion in an English-speaking environment. Du ... [J. Acoust. Soc. Am. 124, 1278 (2008)] published Tue Aug 5, 2008.
The combined effects of reverberation and nonstationary noise on sentence intelligibility
Erwin L. J. George, Joost M. Festen, and Tammo Houtgast
Listening conditions in everyday life typically include a combination of reverberation and nonstationary background noise. It is well known that sentence intelligibility is adversely affected by these factors. To assess their combined effects, an approach is introduced which combines two methods of ... [J. Acoust. Soc. Am. 124, 1269 (2008)] published Tue Aug 5, 2008.
Consonant identification in noise by native and non-native listeners: Effects of local context
Anne Cutler, Maria Luisa Garcia Lecumberri, and Martin Cooke
Speech recognition in noise is harder in second (L2) than first languages (L1). This could be because noise disrupts speech processing more in L2 than L1, or because L1 listeners recover better though disruption is equivalent. Two similar prior studies produced discrepant results: Equivalent noise e ... [J. Acoust. Soc. Am. 124, 1264 (2008)] published Tue Aug 5, 2008.
Coding of intonational meanings beyond F0: Evidence from utterance-final /t/ aspiration in German
Oliver Niebuhr
An acoustic analysis of a German read-speech corpus showed that utterance-final /t/ aspirations differ systematically depending on the accompanying nuclear accent contour. Two contours were included: Terminal-falling early and late F0 peaks in terms of the Kiel Intonation Model. They correspond to H ... [J. Acoust. Soc. Am. 124, 1252 (2008)] published Tue Aug 5, 2008.
Cue-specific effects of categorization training on the relative weighting of acoustic cues to consonant voicing in English
Alexander L. Francis, Natalya Kaganovich, and Courtney Driscoll-Huber
In English, voiced and voiceless syllable-initial stop consonants differ in both fundamental frequency at the onset of voicing (onset F0) and voice onset time (VOT). Although both correlates, alone, can cue the voicing contrast, listeners weight VOT more heavily when both are available. Such differe ... [J. Acoust. Soc. Am. 124, 1234 (2008)] published Tue Aug 5, 2008.
Consonant confusions in white noise
Sandeep A. Phatak, Andrew Lovitt, and Jont B. Allen
The classic [MN55] confusion matrix experiment (16 consonants, white noise masker) was repeated by using computerized procedures, similar to those of Phatak and Allen (2007). [Consonant and vowel confusions in speech-weighted noise, J. Acoust. Soc. Am. 121, 23122316]. The consonant scores in white n ... [J. Acoust. Soc. Am. 124, 1220 (2008)] published Tue Aug 5, 2008.
A simple-shear rheometer for linear viscoelastic characterization of vocal fold tissues at phonatory frequencies
Roger W. Chan and Maritza L. Rodriguez
Previous studies reporting the linear viscoelastic shear properties of the human vocal fold cover or mucosa have been based on torsional rheometry, with measurements limited to low audio frequencies, up to around 80 Hz. This paper describes the design and validation of a custom-built, controlled-st ... [J. Acoust. Soc. Am. 124, 1207 (2008)] published Tue Aug 5, 2008.
Compensation strategies for a lip-tube perturbation of French [u]: An acoustic and perceptual study of 4-year-old children
Lucie Menard, Pascal Perrier, Jerome Aubin, Christophe Savariaux, and Melanie Thibeault
The relations between production and perception in 4-year-old children were examined in a study of compensation strategies for a lip-tube perturbation. Acoustic and perceptual analyses of the rounded vowel [u] produced by twelve 4-year-old French speakers were conducted under two conditions: normal ... [J. Acoust. Soc. Am. 124, 1192 (2008)] published Tue Aug 5, 2008.
Patterns of acquisition of native voice onset time in English-learning children
Joanna H. Lowenstein and Susan Nittrouer
Learning to speak involves both mastering the requisite articulatory gestures of one's native language and learning to coordinate those gestures according to the rules of the language. Voice onset time (VOT) acquisition illustrates this point: The child must learn to produce the necessary upper voca ... [J. Acoust. Soc. Am. 124, 1180 (2008)] published Tue Aug 5, 2008.
Experimental investigation of the influence of a posterior gap on glottal flow and sound
Jong Beom Park and Luc Mongeau
The influence of a posterior gap on the airflow through the human glottis was investigated using a driven synthetic model. Instantaneous orifice discharge coefficient of a glottal shaped orifice was obtained from the time-varying orifice area and the velocity distribution of the pulsated jet measure ... [J. Acoust. Soc. Am. 124, 1171 (2008)] published Tue Aug 5, 2008.
Spectrogram denoising and automated extraction of the fundamental frequency variation of dolphin whistles
Asitha Mallawaarachchi, S. H. Ong, Mandar Chitre, and Elizabeth Taylor
Marine mammal vocalizations are often analyzed using time-frequency representations (TFRs) which highlight their nonstationarities. One commonly used TFR is the spectrogram. The characteristic spectrogram time-frequency (TF) contours of marine mammal vocalizations play a significant role in whistle ... [J. Acoust. Soc. Am. 124, 1159 (2008)] published Tue Aug 5, 2008.
Tuning in the spatial dimension: Evidence from a masked speech identification task
Nicole Marrone, Christine R. Mason, and Gerald Kidd, Jr.
Spatial release from masking was studied in a three-talker soundfield listening experiment. The target talker was presented at 0 degrees azimuth and the maskers were either colocated or symmetrically positioned around the target, with a different masker talker on each side. The symmetric placement ... [J. Acoust. Soc. Am. 124, 1146 (2008)] published Tue Aug 5, 2008.
Sound segregation based on temporal envelope structure and binaural cues
Othmar Schimmel, Steven van de Par, Jeroen Breebaart, and Armin Kohlrausch
The ability to segregate two spectrally and temporally overlapping signals based on differences in temporal envelope structure and binaural cues was investigated. Signals were a harmonic tone complex (HTC) with 20 Hz fundamental frequency and a bandpass noise (BPN). Both signals had interaural diff ... [J. Acoust. Soc. Am. 124, 1130 (2008)] published Tue Aug 5, 2008.
Predicting the path of a changing sound: Velocity tracking and auditory continuity
Poppy A. C. Crum and Ervin R. Hafter
Three studies demonstrate listeners' ability to use the rate of a sound's frequency change (velocity) to predict how the spectral path of the sound is likely to evolve, even in the event of an occlusion. Experiments 1 and 2 use a modified probe-signal method to measure attentional filters and demons ... [J. Acoust. Soc. Am. 124, 1116 (2008)] published Tue Aug 5, 2008.
Spectral integration of speech bands in normal-hearing and hearing-impaired listeners
Joseph W. Hall, III, Emily Buss, and John H. Grose
This investigation examined whether listeners with mildmoderate sensorineural hearing impairment have a deficit in the ability to integrate synchronous spectral information in the perception of speech. In stage 1, the bandwidth of filtered speech centered either on 500 or 2500 Hz was varied adaptiv ... [J. Acoust. Soc. Am. 124, 1105 (2008)] published Tue Aug 5, 2008.
Comparison of behavioral and auditory brainstem response measures of threshold shift in rats exposed to loud sound
Henry E. Heffner, Gimseong Koay, and Rickye S. Heffner
The purpose of this study was to determine how closely the auditory brainstem response (ABR) can estimate sensorineural threshold shifts in rats exposed to loud sound. Behavioral and ABR thresholds were obtained for tones or noise before and after exposure to loud sound. The results showed that the ... [J. Acoust. Soc. Am. 124, 1093 (2008)] published Tue Aug 5, 2008.
Medial olivocochlear efferent inhibition of basilar-membrane responses to clicks: Evidence for two modes of cochlear mechanical excitation
John J. Guinan, Jr. and Nigel P. Cooper
Conceptualizations of mammalian cochlear mechanics are based on basilar-membrane (BM) traveling waves that scale with frequency along the length of the cochlea, are amplified by outer hair cells (OHCs), and excite inner hair cells and auditory-nerve (AN) fibers in a simple way. However, recent exper ... [J. Acoust. Soc. Am. 124, 1080 (2008)] published Tue Aug 5, 2008.
Statistics of instabilities in a state space model of the human cochlea
Emery M. Ku, Stephen J. Elliott, and Ben Lineton
A state space model of the human cochlea is used to test Zweig and Shera's [(1995) The origin of periodicity in the spectrum of evoked otoacoustic emissions, J. Acoust. Soc. Am. 98(4), 20182047 ] multiple-reflection theory of spontaneous otoacoustic emission (SOAE) generation. The state space formul ... [J. Acoust. Soc. Am. 124, 1068 (2008)] published Tue Aug 5, 2008.
Sources of variability in distortion product otoacoustic emissions
Cassie A. Garner, Stephen T. Neely, and Michael P. Gorga
The goal of this study was to determine the extent to which the variability seen in distortion product otoacoustic emissions (DPOAEs), among ears with normal hearing, could be accounted for. Several factors were selected for investigation, including behavioral threshold, differences in middle-ear tr ... [J. Acoust. Soc. Am. 124, 1054 (2008)] published Tue Aug 5, 2008.
Adaptive spatial combining for passive time-reversed communications
Joao Gomes, Antonio Silva, and Sergio Jesus
Passive time reversal has aroused considerable interest in underwater communications as a computationally inexpensive means of mitigating the intersymbol interference introduced by the channel using a receiver array. In this paper the basic technique is extended by adaptively weighting sensor contri ... [J. Acoust. Soc. Am. 124, 1038 (2008)] published Tue Aug 5, 2008.
Removing additive noise via neuro-fuzzy-based reinforcement learning
Ching-Shun Lin and Chris Kyriakakis
In this paper, a systematic treatment for developing a noise removal system based on the fundamental principle of reinforcement learning and fuzzy cerebellar model articulation controller (FCMAC) is presented. The proposed system improves its performance over time through two mechanisms. First, the ... [J. Acoust. Soc. Am. 124, 1026 (2008)] published Tue Aug 5, 2008.
Prediction of the acoustic form function by neural network techniques for immersed tubes
A. Dariouchy, E. Aassif, G. Maze, D. Decultot, and A. Moudden
A new approach is used to predict the acoustic form function (FF) for an infinite length cylindrical shell excited perpendicularly to its axis using the artificial neural network (ANN) techniques. The WignerVille distribution is used like a comparison tool between the FF calculated by the analytical ... [J. Acoust. Soc. Am. 124, 1018 (2008)] published Tue Aug 5, 2008.
Time reversal of flexural waves in a beam at audible frequency
Dany Francoeur and Alain Berry
There has been very limited work on the application of time Reversal to the propagation of audible frequency waves in mechanical structures. The present work concentrates on the application of time reversal to the focusing of audible range, flexural waves in an infinite beam, and to the detection of ... [J. Acoust. Soc. Am. 124, 1006 (2008)] published Tue Aug 5, 2008.
Modeling of wave dispersion along cylindrical structures using the spectral method
Florian Karpfinger, Boris Gurevich, and Andrey Bakulin
Algorithm and code are presented that solve dispersion equations for cylindrically layered media consisting of an arbitrary number of elastic and fluid layers. The algorithm is based on the spectral method which discretizes the underlying wave equations with the help of spectral differentiation matr ... [J. Acoust. Soc. Am. 124, 859 (2008)] published Tue Aug 5, 2008.
Stability analysis of thermally induced spontaneous gas oscillations in straight and looped tubes
Yuki Ueda and Chisachi Kato
A gas in a tube spontaneously oscillates when the temperature gradient applied along the wall of the tube is higher than the critical value. This spontaneous gas oscillation is caused by the thermal interaction between the gas and the tube wall. The stability limit of the thermally induced gas oscil ... [J. Acoust. Soc. Am. 124, 851 (2008)] published Tue Aug 5, 2008.
Coupled hydrodynamic-acoustic modeling of sound generated by impacting cylindrical water jets
Xuemei Chen, Steven L. Means, William G. Szymczak, and Joel C. W. Rogers
A coupled hydrodynamic-acoustic model describing acoustic propagation in a fluid containing multiple bubbles is proposed and applied to simulate noise generated by impacting water jets. The total pressure is decomposed into a hydrodynamic part and an acoustic part and computed using different scheme ... [J. Acoust. Soc. Am. 124, 841 (2008)] published Tue Aug 5, 2008.
Tank measurements of scattering from a resin-filled fiberglass spherical shell with internal flaws
Alessandra Tesei, Piero Guerrini, and Mario Zampolli
This paper presents results of acoustic inversion and structural health monitoring achieved by means of low to midfrequency elastic scattering analysis of simple, curved objects, insonified in a water tank. Acoustic elastic scattering measurements were conducted between 15 and 100 kHz on a 60-mm-ra ... [J. Acoust. Soc. Am. 124, 827 (2008)] published Tue Aug 5, 2008.
Analysis of time delay effects on a linear bubble chain system
Andrew Ooi, Aneta Nikolovska, and Richard Manasseh
A chain of vertically rising discrete air bubbles represents a transition phenomenon from individual to continuum behavior in a bubbly liquid. Previous studies have reported that there is a preference for acoustic energy to propagate along the bubble chain and that this behavior could be explained b ... [J. Acoust. Soc. Am. 124, 815 (2008)] published Tue Aug 5, 2008.
Acoustic characterization of panel materials under simulated ocean conditions using a parametric array source
Victor F. Humphrey, Stephen P. Robinson, John D. Smith, Michael J. Martin, Graham A. Beamiss et al.
A technique for evaluating the underwater acoustic performance of panels under simulated ocean conditions in a laboratory test facility is described. The method uses a parametric array as a source of sound within a test vessel capable of simulating ocean depths down to 700 m and water temperatures ... [J. Acoust. Soc. Am. 124, 803 (2008)] published Tue Aug 5, 2008.
Classification of live, untethered zooplankton from observations of multiple-angle acoustic scatter
Paul L. D. Roberts and Jules S. Jaffe
A broadband, multiple-angle acoustic array was used to classify millimeter to centimeter sized live zooplankton in a laboratory tank. Reflections in the frequency range from 1.5 to 2.5 MHz were recorded from untethered 14 mm calanoid copepods and 812 mm mysids over an angular range of 0 degrees ... [J. Acoust. Soc. Am. 124, 796 (2008)] published Tue Aug 5, 2008.
Bayesian geoacoustic inversion of ship noise on a horizontal array
Dag Tollefsen and Stan E. Dosso
This paper applies geoacoustic inversion to low-frequency narrow-band acoustic data from a quiet surface ship recorded on a bottom-moored horizontal line array in shallow water. A Bayesian matched-field inversion method is employed which quantifies geoacoustic uncertainties and allows for meaningful ... [J. Acoust. Soc. Am. 124, 788 (2008)] published Tue Aug 5, 2008.
Characterization of an elastic target in a shallow water waveguide by decomposition of the time-reversal operator
Franck D. Philippe, Claire Prada, Julien de Rosny, Dominique Clorennec, Jean-Gabriel Minonzio et al.
This paper reports the results of an investigation into extracting of the backscattered frequency signature of a target in a waveguide. Retrieving the target signature is difficult because it is blurred by waveguide reflections and modal interference. It is shown that the decomposition of the time-r ... [J. Acoust. Soc. Am. 124, 779 (2008)] published Tue Aug 5, 2008.
Directionality and maneuvering effects on a surface ship underwater acoustic signature
Mark V. Trevorrow, Boris Vasiliev, and Svein Vagle
This work examines underwater source spectra of a small (560 tons, 40 m length), single-screw oceanographic vessel, focusing on directionality and effects of maneuvers. The measurements utilized a set of four, self-contained buoys with GPS positioning, each recording two calibrated hydrophones wit ... [J. Acoust. Soc. Am. 124, 767 (2008)] published Tue Aug 5, 2008.
Sound transmission at ground level in a short-grass prairie habitat and its implications for long-range communication in the swift fox Vulpes velox
Safi K. Darden, Simon B. Pedersen, Ole N. Larsen, and Torben Dabelsteen
The acoustic environment of swift foxes Vulpes velox vocalizing close to the ground and the effect of propagation on individual identity information in vocalizations were quantified in a transmission experiment in prairie habitat. Sounds were propagated (0.45 m above the ground) at distances up to ... [J. Acoust. Soc. Am. 124, 758 (2008)] published Tue Aug 5, 2008.
Sound-wave coherence in atmospheric turbulence with intrinsic and global intermittency
D. Keith Wilson, Vladimir E. Ostashev, and George H. Goedecke
The coherence function of sound waves propagating through an intermittently turbulent atmosphere is calculated theoretically. Intermittency mechanisms due to both the turbulent energy cascade (intrinsic intermittency) and spatially uneven production (global intermittency) are modeled using ensembles ... [J. Acoust. Soc. Am. 124, 743 (2008)] published Tue Aug 5, 2008.
Sound propagation in the vicinity of an isolated building: An experimental investigation
W. C. Kirkpatrick Alberts, II, John M. Noble, and Mark A. Coleman
Recently, the study of acoustics in urban terrain has been concerned with the propagation of sound through street canyons typical of residential areas in large cities, while sparsely built suburban and rural areas have received little attention. An isolated building's effect on propagating sound is ... [J. Acoust. Soc. Am. 124, 733 (2008)] published Tue Aug 5, 2008.
The Herschel--Quincke tube: The attenuation conditions and their sensitivity to mean flow
Mikael Karlsson, Ragnar Glav, and Mats Abom
The classic HerschelQuincke tube is a parallel connection of two ducts yielding multiple noise attenuation maxima via destructive interference. This problem has been discussed to different degrees by a number of authors over the years. This study returns to the basics of the system for the purpose o ... [J. Acoust. Soc. Am. 124, 723 (2008)] published Tue Aug 5, 2008.
Application of Hamiltonian of ray motion to room acoustics
Sin'ichiro Koyanagi, Takeru Nakano, and Tetsuji Kawabe
Based on a standard Hamiltonian of acoustic ray, it is shown that a ray motion in a finite region can be treated as a particle motion inside a potential well. The boundary reflections of ray can be described by introducing a so-called confining potential to confine a ray motion in a closed domain. I ... [J. Acoust. Soc. Am. 124, 719 (2008)] published Tue Aug 5, 2008.
Simultaneous production of low- and high-frequency sounds by neonatal finless porpoises
Songhai Li, Kexiong Wang, Ding Wang, Shouyue Dong, and Tomonari Akamatsu
Phocoenids are generally considered to be nonwhistling species that produce only high-frequency pulsed sounds. Here our results show that neonatal finless porpoises (Neophocaena phocaenoides) frequently produce clear low-frequency (23 kHz) pulsed signals, without distinct high-frequency energy, jus ... [J. Acoust. Soc. Am. 124, 716 (2008)] published Tue Aug 5, 2008.
Flexible cue use in nonnative phonetic categorization
Mirjam Broersma
Native and nonnative listeners categorized final /v/ versus /f/ in English nonwords. Fricatives followed phonetically long (originally /v/-preceding) or short (originally /f/-preceding) vowels. Vowel duration was constant for each participant and sometimes mismatched other voicing cues. Previous res ... [J. Acoust. Soc. Am. 124, 712 (2008)] published Tue Aug 5, 2008.
Ultrasonic scatterer, ultrasonic imaging method and ultrasonic imaging apparatus
Hirohiko Tsuzuki
... [J. Acoust. Soc. Am. 124, 711 (2008)] published Tue Aug 5, 2008.
Method and apparatus for performing CW doppler ultrasound utilizing a 2D matrix array
Kjell Kristoffersen and Glenn Reidar Lie
... [J. Acoust. Soc. Am. 124, 711 (2008)] published Tue Aug 5, 2008.
Three dimensional locator for diagnostic ultrasound or medical imaging
Wayne J. Gueck and John C. Lazenby
... [J. Acoust. Soc. Am. 124, 710 (2008)] published Tue Aug 5, 2008.
Method and apparatus for ultrasound compound imaging with combined fundamental and harmonic signals
Xiaohui Hao
... [J. Acoust. Soc. Am. 124, 710 (2008)] published Tue Aug 5, 2008.
Systems and methods for delivering ultrasound energy at an output power level that remains essentially constant despite variations in transducer impedance
Todd A. Thompson
... [J. Acoust. Soc. Am. 124, 710 (2008)] published Tue Aug 5, 2008.
Ultrasonic transmitting and receiving apparatus
Tomoo Satoh
... [J. Acoust. Soc. Am. 124, 710 (2008)] published Tue Aug 5, 2008.
Device for guiding the movement of a transducer of an ultrasonic probe
Won Soon Hwang
... [J. Acoust. Soc. Am. 124, 710 (2008)] published Tue Aug 5, 2008.
Telephone device having operation function by voice input
Hiroyuki Otagaki
... [J. Acoust. Soc. Am. 124, 709 (2008)] published Tue Aug 5, 2008.
Error-tolerant language understanding system and method
Huei-Ming Wang and Yi-Chung Lin
... [J. Acoust. Soc. Am. 124, 709 (2008)] published Tue Aug 5, 2008.
Speech recognition apparatus and method
Kenichiro Nakagawa
... [J. Acoust. Soc. Am. 124, 709 (2008)] published Tue Aug 5, 2008.
Sound effecter, fundamental tone extraction method, and computer program
Masaru Setoguchi
... [J. Acoust. Soc. Am. 124, 709 (2008)] published Tue Aug 5, 2008.
Hearing prosthesis with automatic classification of the listening environment
Nils Peter Nordqvist and Arne Leijon
... [J. Acoust. Soc. Am. 124, 709 (2008)] published Tue Aug 5, 2008.
Spectral enhancement using digital frequency warping
James M. Kates
... [J. Acoust. Soc. Am. 124, 708 (2008)] published Tue Aug 5, 2008.
Optimum solution method, hearing aid fitting apparatus utilizing the optimum solution method, and system optimization adjusting method and apparatus
Hideyuki Takagi
... [J. Acoust. Soc. Am. 124, 708 (2008)] published Tue Aug 5, 2008.
Method for electrically stimulating the Cochlea
Ben M. Clopton
... [J. Acoust. Soc. Am. 124, 708 (2008)] published Tue Aug 5, 2008.
Device and method to adjust a hearing device
Josef Chalupper
... [J. Acoust. Soc. Am. 124, 708 (2008)] published Tue Aug 5, 2008.
Hearing aid and operating method with switching among different directional characteristics
Eghart Fischer
... [J. Acoust. Soc. Am. 124, 707 (2008)] published Tue Aug 5, 2008.
Wireless communication device having electromagnetic compatibility for hearing aid devices
Yiu K. Chan
... [J. Acoust. Soc. Am. 124, 707 (2008)] published Tue Aug 5, 2008.
Signal processing in a hearing aid
Arthur Schaub
... [J. Acoust. Soc. Am. 124, 707 (2008)] published Tue Aug 5, 2008.
Hearing assistive apparatus having sound replay capability and spatially separated components
Trevor I. Blumenau
... [J. Acoust. Soc. Am. 124, 707 (2008)] published Tue Aug 5, 2008.
Hearing aid device and operating method for automatically switching voltage supply to a connected external device
Kunibert Husung
... [J. Acoust. Soc. Am. 124, 706 (2008)] published Tue Aug 5, 2008.
Method for dynamic determination of time constants, method for level detection, method for compressing an electric audio signal and hearing aid, wherein the method for compression is used
Joachim Neumann
... [J. Acoust. Soc. Am. 124, 706 (2008)] published Tue Aug 5, 2008.
Acoustic pressure calibrator
Guenther Mueller and Joseph Steigenberger
... [J. Acoust. Soc. Am. 124, 706 (2008)] published Tue Aug 5, 2008.
Sound control method
Ralph Michael Fay
... [J. Acoust. Soc. Am. 124, 706 (2008)] published Tue Aug 5, 2008.
Milking plant and method for reducing sound emissions in a milking plant
Erwin Bilgery
... [J. Acoust. Soc. Am. 124, 706 (2008)] published Tue Aug 5, 2008.
System and method for optimized active controller design in an ANR system
Michael A. Vaudrey
... [J. Acoust. Soc. Am. 124, 705 (2008)] published Tue Aug 5, 2008.
Apparatus and method for generating acoustic energy in a receiver assembly
Stephen C. Thompson
... [J. Acoust. Soc. Am. 124, 705 (2008)] published Tue Aug 5, 2008.
Sound suppressor
Thomas Trail Hoel
... [J. Acoust. Soc. Am. 124, 705 (2008)] published Tue Aug 5, 2008.
Acoustic mechanical retainer
Scott Sanicki and Mark W. Costa
... [J. Acoust. Soc. Am. 124, 704 (2008)] published Tue Aug 5, 2008.
Magnetostrictive stress wave sensor
Steven R. Stuve
... [J. Acoust. Soc. Am. 124, 704 (2008)] published Tue Aug 5, 2008.
Suspension control apparatus
Toru Uchino
... [J. Acoust. Soc. Am. 124, 704 (2008)] published Tue Aug 5, 2008.
Roll, in particular middle roll of a calendar, and calendar
Rolf van Haag
... [J. Acoust. Soc. Am. 124, 704 (2008)] published Tue Aug 5, 2008.
Vibration damping system
John Christian Asmussen
... [J. Acoust. Soc. Am. 124, 704 (2008)] published Tue Aug 5, 2008.
Anti-seismic device with vibration-reducing units arranged in parallel
Chi-Chang Lin and Jer-Fu Wang
... [J. Acoust. Soc. Am. 124, 704 (2008)] published Tue Aug 5, 2008.
Internal viscous damper monitoring system and method
Peter Moller and Erik Svenske
... [J. Acoust. Soc. Am. 124, 703 (2008)] published Tue Aug 5, 2008.
Method of preparing and method of applying a vibration damping system
John Asmussen
... [J. Acoust. Soc. Am. 124, 703 (2008)] published Tue Aug 5, 2008.
Vibration damping in chemical mechanical polishing system
Hung Chih Chen
... [J. Acoust. Soc. Am. 124, 703 (2008)] published Tue Aug 5, 2008.
Silent chain
Kazufumi Kotani
... [J. Acoust. Soc. Am. 124, 703 (2008)] published Tue Aug 5, 2008.
Strap silencer
Jaffrey A. Owens
... [J. Acoust. Soc. Am. 124, 703 (2008)] published Tue Aug 5, 2008.
Instrumented platform for vibration-sensitive equipment
Vyacheslav M. Ryaboy and Warren Booth
... [J. Acoust. Soc. Am. 124, 703 (2008)] published Tue Aug 5, 2008.
Microphone
Wolfgang Niehoff
... [J. Acoust. Soc. Am. 124, 702 (2008)] published Tue Aug 5, 2008.
Headphones with a multichannel guiding mechanism
Jui-Shu Huang
... [J. Acoust. Soc. Am. 124, 702 (2008)] published Tue Aug 5, 2008.
Individual acoustic wave switch
Terence J. Knowles and Charles F. Bremigan III
... [J. Acoust. Soc. Am. 124, 702 (2008)] published Tue Aug 5, 2008.
Surface acoustic wave device, surface acoustic wave apparatus, and communications equipment
Yuuko Yokota
... [J. Acoust. Soc. Am. 124, 702 (2008)] published Tue Aug 5, 2008.
Lightweight speaker enclosure
Ross Ritto
... [J. Acoust. Soc. Am. 124, 701 (2008)] published Tue Aug 5, 2008.
Arbitrary coverage angle sound integrator
Scott M. Opie
... [J. Acoust. Soc. Am. 124, 701 (2008)] published Tue Aug 5, 2008.
Acoustic transducer with mechanical balancing
An Duc Nguyen and Charles M. Sprinkle
... [J. Acoust. Soc. Am. 124, 701 (2008)] published Tue Aug 5, 2008.
Acoustic radiator with a baffle of a diameter at least as large as the opening of the speaker enclosure to which it is mounted
Joseph Y. Sahyoun
... [J. Acoust. Soc. Am. 124, 701 (2008)] published Tue Aug 5, 2008.
Diaphragm for loud speaker and loud speaker employing it
Ryo Kuribayashi and Shinsaku Sawa
... [J. Acoust. Soc. Am. 124, 700 (2008)] published Tue Aug 5, 2008.
System of sound transducers with controllable directional properties
Johan van der Werff
... [J. Acoust. Soc. Am. 124, 700 (2008)] published Tue Aug 5, 2008.
Loudspeaker system for virtual sound synthesis
Ulrich Horbach and Etienne Corteel
... [J. Acoust. Soc. Am. 124, 700 (2008)] published Tue Aug 5, 2008.
Acoustic pulse actuator
Joshua M. Chambers
... [J. Acoust. Soc. Am. 124, 699 (2008)] published Tue Aug 5, 2008.
Torque sensor
James Zt Liu and Steven J. Magee
... [J. Acoust. Soc. Am. 124, 699 (2008)] published Tue Aug 5, 2008.
Method for using variable supersonic Mach number air heater utilizing supersonic combustion
Kenneth J. Wilson
... [J. Acoust. Soc. Am. 124, 699 (2008)] published Tue Aug 5, 2008.
What exactly is meant by the term ``auralization?''
Jason E. Summers
... [J. Acoust. Soc. Am. 124, 697 (2008)] published Tue Aug 5, 2008.
Cumulative Indexes to the Journal of the Acoustical Society of America
... [J. Acoust. Soc. Am. 124, 693 (2008)] published Tue Aug 5, 2008.
Preliminary Notice: 156th Meeting of the Acoustical Society of America
... [J. Acoust. Soc. Am. 124, 689 (2008)] published Tue Aug 5, 2008.
Effects of transverse temperature gradient on acoustic and streaming velocity fields in a resonant cavity
Majid Nabavi, Kamran Siddiqui, and Javad Dargahi
Effects of transverse temperature gradient on acoustic and streaming velocity fields inside a gas-filled rectangular enclosure subject to acoustic standing wave are investigated experimentally. Synchronized particle image velocimetry technique has been used to measure the acoustic and streaming velo ... [Appl. Phys. Lett. 93, 051902 (2008)] published Mon Aug 4, 2008.
Doing Arithmetic With Nonlinear Acoustic Vortices
Regis Marchiano and Jean-Louis Thomas
Phase singularities of wave-front-like screw dislocations or vortices possess a well-defined quantity that can only take integer value: the topological charge. In the nonlinear regime, it has been demonstrated that optical or acoustical vortices interact and the topological charge follows a conserva ... [Phys. Rev. Lett. 101, 064301 (2008)] published Mon Aug 4, 2008.