The structural parameter optimization of interdigital transducer in single electron transport devices
Li Song, Hui Yuan, Chuanyu Zhang, Ling Li, Chuan Lu et al.
We investigate the influence of the interdigital transducer (IDT) structure on the amplitude of the surface acoustic wave (SAW) in a SAW device. The SAW amplitude at the entrance of the quantum point contact (QPC) is obtained by using coupling-of-modes theory and p-matrix method. The calculated resu ... [J. Appl. Phys. 106, 104508 (2009)] published Thu Nov 19, 2009.
Gas Void Fraction Measurement in Two-Phase Gas/Liquid Slug Flow Using Acoustic Emission Technology
S. Al-lababidi, A. Addali, H. Yeung, D. Mba, and F. Khan
The gas-liquid two-phase slug flow regime phenomenon is commonly encountered in the chemical engineering industry, particularly in oil and gas production transportation pipelines. Slug flow regime normally occurs for a range of pipe inclinations, and gas and liquid flowrates. A pipeline operating in ... [J. Vib. Acoust. 131, 064501 (2009)] published Wed Nov 18, 2009.
Sound control by temperature gradients
Jose Sanchez-Dehesa, Mitko I. Angelov, Francisco Cervera, and Liang-Wu Cai
This work reports experiments showing that airborne sound propagation can be controlled by temperature gradients. A system of two heated tubes is here used to demonstrate the collimation and focusing of an ultrasonic beam by the refractive index profile created by the temperature gradients existing ... [Appl. Phys. Lett. 95, 204102 (2009)] published Wed Nov 18, 2009.
The intelligibility of pointillistic speech
Gerald Kidd, Jr., Timothy M. Streeter, Antje Ihlefeld, Ross K. Maddox, and Christine R. Mason
A form of processed speech is described that is highly discriminable in a closed-set identification format. The processing renders speech into a set of sinusoidal pulses played synchronously across frequency. The processing and results from several experiments are described. The number and width of ... [J. Acoust. Soc. Am. 126, EL196 (2009)] published Mon Nov 16, 2009.
Acoustic measurements of clay-size particles
Wayne O. Carpenter, Jr., James P. Chambers, Daniel G. Wren, Roger A. Kuhnle, and Jeffrey A. Diers
Knowledge of sediment concentration is important in the study of streams and rivers. The work presented explores using high frequency (20 MHz) acoustic signal attenuation to measure the concentration of fine sediment particles (0.25.0 [mu]m) in a fluvial environment. A small laboratory tank with a ... [J. Acoust. Soc. Am. 126, EL190 (2009)] published Mon Nov 16, 2009.
Time-Series Analysis: Assessing the Effects of Multiple Educational Interventions in a Small-Enrollment Course
Aaron R. Warren
Time-series designs are an alternative to pretest-posttest methods that are able to identify and measure the impacts of multiple educational interventions, even for small student populations. Here, we use an instrument employing standard multiple-choice conceptual questions to collect data from stud ... [AIP Conf. Proc. 1179, 293 (2009)] published Thu Nov 12, 2009.
Source-filter interaction in the opposite direction: subglottal coupling and the influence of vocal fold mechanics on vowel spectra during the closed phase
Steven M. Lulich, Matias Zanartu, Daryush D. Mehta, and Robert E. Hillman
Studies of speech source-filter interaction usually investigate the effect of the speech transfer function (loading) on vocal fold vibration and the voice source. In this study we explore how vocal fold mechanics affect the transfer function throughout the glottal cycle, with emphasis on the closed ... [POMA 6, 060007 (2009)] published Tue Nov 10, 2009.
Transient processes in acoustic resonators
Armen Sarvazyan, Lev A. Ostrovsky, and Andrey Rubyanets
The use of ultrasound in resonators for manipulating particles in various biomedical applications is a relatively well studied topic. These studies were mostly concerned with steady-state processes. However, in certain important applications, such as stirring and mixing fluids in microfluidics and ... [POMA 6, 020002 (2009)] published Tue Nov 10, 2009.
Acoustic paper diaphragm and acoustic transducer apparatus
Masaru Uryu and Kunihiko Tokura
Abstract not available. [J. Acoust. Soc. Am. 126, 2828 (2009)] published Thu Nov 5, 2009.
Acoustical Standards News
Abstract not available. [J. Acoust. Soc. Am. 126, 2818 (2009)] published Thu Nov 5, 2009.
New Fellows of the Acoustical Society of America
Abstract not available. [J. Acoust. Soc. Am. 126, 2815 (2009)] published Thu Nov 5, 2009.
Erratum: Detection of time-varying harmonic amplitude alterations due to spectral interpolations between musical instrument tones [J. Acoust. Soc. Am. 125, 492 (2009)]
Andrew B. Horner, James W. Beauchamp, and Richard H. Y. So
Abstract not available. [J. Acoust. Soc. Am. 126, 2814 (2009)] published Thu Nov 5, 2009.
Linear behavior of a preformed microbubble containing light absorbing nanoparticles: Insight from a mathematical model
E. Sassaroli, K. C. P. Li, and B. E. O'Neill
Microbubbles are used as ultrasonic contrast agents in medical imaging because of their highly efficient scattering properties. Gold nanoparticles absorb specific wavelengths of optical radiation very effectively with the subsequent generation of thermo-acoustic waves in the surrounding medium. A th ... [J. Acoust. Soc. Am. 126, 2802 (2009)] published Thu Nov 5, 2009.
Behavioral measures of signal recognition thresholds in frogs in the presence and absence of chorus-shaped noise
Mark A. Bee and Joshua J. Schwartz
Anuran amphibians are superb animal models for investigating the mechanisms underlying acoustic signal perception amid high levels of background noise generated by large social aggregations of vocalizing individuals. Yet there are not well-established methods for quantifying a number of key measures ... [J. Acoust. Soc. Am. 126, 2788 (2009)] published Thu Nov 5, 2009.
Effects of syllable-final segment duration on the identification of synthetic speech continua by birds and humans
Thomas E. Welch, James R. Sawusch, and Micheal L. Dent
In an attempt to test whether experience with or knowledge of language is necessary to show typical speaking rate effects in the perception of speech, budgerigars (Melopsittacus undulatus) and humans categorized stimuli from the synthetic continua /ba/-/wa/ and /bas/-/was/, with both short and long ... [J. Acoust. Soc. Am. 126, 2779 (2009)] published Thu Nov 5, 2009.
Vocalizations of wild Asian elephants (Elephas maximus): Structural classification and social context
Smita Nair, Rohini Balakrishnan, Chandra Sekhar Seelamantula, and R. Sukumar
Elephants use vocalizations for both long and short distance communication. Whereas the acoustic repertoire of the African elephant (Loxodonta africana) has been extensively studied in its savannah habitat, very little is known about the structure and social context of the vocalizations of the Asian ... [J. Acoust. Soc. Am. 126, 2768 (2009)] published Thu Nov 5, 2009.
Acoustic radiation patterns of mating calls of the tungara frog (Physalaemus pustuosus): Implications for multiple receivers
Ximena E. Bernal, Rachel A. Page, Michael J. Ryan, Theodore F. Argo, IV, and Preston S. Wilson
In order for a signal to be transmitted from a sender to a receiver, the receiver must be within the active space of the signal. If patterns of sound radiation are not omnidirectional, the position as well as the distance of the receiver relative to the sender is critical. In previous measurements o ... [J. Acoust. Soc. Am. 126, 2757 (2009)] published Thu Nov 5, 2009.
Shock-induced bubble jetting into a viscous fluid with application to tissue injury in shock-wave lithotripsy
J. B. Freund, R. K. Shukla, and A. P. Evan
Shock waves in liquids are known to cause spherical gas bubbles to rapidly collapse and form strong re-entrant jets in the direction of the propagating shock. The interaction of these jets with an adjacent viscous liquid is investigated using finite-volume simulation methods. This configuration serv ... [J. Acoust. Soc. Am. 126, 2746 (2009)] published Thu Nov 5, 2009.
Optical tracking of acoustic radiation force impulse-induced dynamics in a tissue-mimicking phantom
Richard R. Bouchard, Mark L. Palmeri, Gianmarco F. Pinton, Gregg E. Trahey, Jason E. Streeter et al.
Optical tracking was utilized to investigate the acoustic radiation force impulse (ARFI)-induced response, generated by a 5-MHz piston transducer, in a translucent tissue-mimicking phantom. Suspended 10-[mu]m microspheres were tracked axially and laterally at multiple locations throughout the field ... [J. Acoust. Soc. Am. 126, 2733 (2009)] published Thu Nov 5, 2009.
Vocal cues to identity and relatedness in giant pandas (Ailuropoda melanoleuca)
Benjamin D. Charlton, Zhang Zhihe, and Rebecca J. Snyder
A range of acoustic characteristics typically carry information on individual identity in mammalian calls. In addition, physical similarities in vocal production anatomy among closely related individuals may result in similarities in the acoustic structure of vocalizations. Here, acoustic analyses b ... [J. Acoust. Soc. Am. 126, 2721 (2009)] published Thu Nov 5, 2009.
The player and the bowed string: Coordination of bowing parameters in violin and viola performance
E. Schoonderwaldt
An experiment was conducted with four violin and viola players, measuring their bowing performance using an optical motion capture system and sensors on the bow. The measurements allowed for a detailed analysis of the use and coordination of the main bowing parameters bow velocity, bow force, and bo ... [J. Acoust. Soc. Am. 126, 2709 (2009)] published Thu Nov 5, 2009.