The paper reviews current knowledge of intensity and directionality of bat echolocation signals. Recent studies have revealed that echolocating bats can be much louder than previously believed. Bats previously dubbed "whispering" can emit calls with source levels up to 110 dB SPL at 10 cm and the louder open space hunting bats have been recorded at above 135 dB SPL. This implies that maximum em...

Vector acoustic intensity provides both the direction and magnitude of energy flow at the probe location and is, hence, more informative than acoustic pressure measurements. However, this important quantity has seen little application previously in aeroacoustics. In the present work, an intensity probe, consisting of four microphones, captured the radiated field to the sideline and aft of a tet...

introduction when a liquid is irradiated with high-intensity and low-frequency ultrasound, acoustic cavitation occurs and there are some methods to determine and quantify this phenomenon. the existing methods for performing these experiments include sonochemiluminescence (scl) and chemical dosimetric methods. the particles in a liquid decrease the ultrasonic intensity threshold needed for cavit...

Initially used in the treatment of prostate cancer and uterine fibroids, the role of focused ultrasound has expanded as transcranial acoustic wave distortion and other limitations have been overcome. Its utility relies on focal energy deposition via acoustic wave propagation. The duty cycle and intensity of focused ultrasound influence the rate of energy deposition and result in unique physiolo...

This study investigates F0, intensity and duration as acoustic parameters for the perception changing their relative weight, according to the perceptual development. Four groups – native Japanese who have studied German for one year at the Department of German, native Germans who don’t understand Japanese, Japanese students who had lived in Germany for more than one year, and German students wh...

PURPOSE This study aims to demonstrate, using human cadavers the feasibility of energy-based adaptive focusing of ultrasonic waves using magnetic resonance acoustic radiation force imaging (MR-ARFI) in the framework of non-invasive transcranial high intensity focused ultrasound (HIFU) therapy. METHODS Energy-based adaptive focusing techniques were recently proposed in order to achieve aberrat...

We examined cross-language differences in neural encoding and tracking of intensity and pitch cues signaling English stress patterns. Auditory mismatch negativities (MMNs) were recorded in English and Mandarin listeners in response to contrastive English pseudowords whose primary stress occurred either on the first or second syllable (i.e., "nocTICity" vs. "NOCticity"). The contrastive syllable...

This study deals with the relevance of spectral emphasis for accent detection. Spectral emphasis may be described as an acoustic feature reflecting the relative intensity in the higher frequency bands. In an experiment using a rudimentary accent detector, spectral emphasis was shown to be more useful for the detection of accents than overall intensity. Furthermore, spectral emphasis was found t...

We report on a new click type found in Mangetti Dune !Xung (M.D. !Xung) a forward released denti-alveolar lateral click, transcribed [ ||| ]. We present acoustic data showing that ||| is distinct from the "typical" lateral (post-) alveolar ||, and the central (post-) alveolar !, a conclusion supported by synchronic and diachronic analyses of Northern Khoisan [8, 12]. We use Adaptive Dispersion ...

A numerical and experimental investigation of the acoustic streaming flow in the near field of a circular plane ultrasonic transducer in water is performed. The experimental domain is a parallelepipedic cavity delimited by absorbing walls to avoid acoustic reflection, with a top free surface. The flow velocities are measured by particle image velocimetry, leading to well-resolved velocity profi...