Children’s vowel acquisition has long been examined on the basis of transcription-based evaluations of the accuracy rate of the vowel production in children before 5 years of age. This study examines the development of static and dynamic acoustic features in children between 3 and 7 years of age by comparing the acoustic features of children with those of adults. All acoustic analyses were base...

This work investigated the relationship between acoustic parameters and phonetic features for six Mandarin affricates. The acoustic parameters under study included normalized duration, normalized amplitude, spectral energy distribution, and F2 onset of the following vowel, while the phonetic features under study included place of articulation, state of aspiration, and identity of the following ...

Acoustic sampling has been used to investigate the ecology of Antarctic krill (Euphausia superba) and to provide information on dispersion and abundance necessary to manage their harvest. Population estimates based on multi-ship acoustic surveys have been used to set catch limits. More localized acoustic surveys have been conducted to study the response of landbreeding krill predators to local ...

INTRODUCTION: In WDM soliton systems, the main sources of timing jitter (TJ) include the Gordon-Haus (GH) effect, soliton-soliton collisions (SSC), the acoustic effect, and the polarization mode dispersion. Although TJ from the GH effect is random from pulse to pulse, other sources lead to nonrandom TJ. Because the time displacements from the nonrandom sources highly depend on the pattern of tr...

Low-frequency compressional waves were observed in a suspension of strongly coupled 9.4 mm spheres in an rf Kr plasma. Both parts of the complex wave number were measured to determine the dispersion relation, which agreed with a theoretical model of damped dust acoustic waves, ignoring strong coupling, but not with a strongly coupled dust-lattice wave model. The results yield experimental value...

There are several classes of coherent phonons whose generation mechanisms are completely different: impulsive stimulated Raman scattering, Brillouin oscillations, and coherent longitudinal-acoustic-phonon Bragg reflection. All of these are investigated in Si/SiGe superlattices using a picosecond ultrasonics technique at room temperature. Bragg reflection for a single vibrational mode is related...

The digital waveguide mesh is an extension of the one-dimensional digital waveguide technique. The mesh is used for simulation of twoand three-dimensional wave propagation in musical instruments and acoustic spaces. The rectangular digital waveguide mesh algorithm suffers from direction-dependent dispersion. By using the interpolated mesh, nearly uniform wave propagation characteristics are obt...

The linear dispersion of the low-dimensional acoustic surface plasmon (ASP) opens perspectives in energy conversion, transport, and confinement far below optical frequencies. Although the ASP exists in a wide class of materials, ranging from metal surfaces and ultrathin films to graphene and topological insulators, its properties are still largely unexplored. Taking Au(111) as a model system, o...

For time-domain modeling based on the acoustic wave equation, spectral methods have recently demonstrated promise. This letter presents an extension of a spectral domain decomposition approach, previously used to solve the lossless linear wave equation, which accommodates frequency-dependent atmospheric attenuation and assignment of arbitrary dispersion relations. Frequency-dependence is straig...

The underlying working principle of detecting impulsive stimulated scattering signals in a differential configuration of heterodyne diffraction detection is unraveled by involving optical scattering theory. The feasibility of the method for the thermoelastic characterization of coating-substrate systems is demonstrated on the basis of simulated data containing typical levels of noise. Besides t...