Results 41 to 50 of about 33,808 (304)
Demonstrating Vibrational Current Generation With a Self‐Assembled Bioelectret
Advanced Functional Materials, EarlyView.Vacuum‐deposited films of the plant‐derived molecule, Baicalein, form a self‐assembled bioelectret exhibiting spontaneous orientation polarization and a giant surface potential. The films induce alternating current during the vibration of a movable electrode without charging treatments. Hydrocarbon protection enhances the air stability of the Baicalein
Kouki Akaike +7 more
wiley +1 more source
The relationship between acoustic indices of speech motor control variability and other measures of speech performance in dysarthria [PDF]
, 2012 Previous studies suggested that variability indices based on information extracted from the acoustic signal are potentially useful in assessing dysarthric speech.
Van Brenk, Frits, Lowit, Anja
core
Phonon confinement and size effect in Raman spectra of ZnO nanoparticles
Heliyon, 2019 We study Raman spectra of ZnO nanoparticles of 5–12 nm size in the whole range of the first-order phonon bands. We apply the 3D phonon confinement model (PCM) for the interpretation of the observed Raman spectra.
Vitaly I. Korepanov +3 more
doaj +1 more source
Optical Signature of Moiré Superlattices Formed by Twisted SrTiO3 Membranes
Advanced Functional Materials, EarlyView.We discover optical signatures from bonded interfaces in twisted SrTiO3 moiré superlattices, including low‐frequency Raman vibrational modes and strong second‐harmonic generation, consistent with strong interlayer coupling inferred from cross‐sectional electron microscopy and ab initio calculations. ABSTRACT Moiré superlattices formed at the interfaces
T. A. M. Ragib Shahriar +13 more
wiley +1 more source
Weathering the storm: developments in the acoustic sensing of wind and rain [PDF]
, 2003 An Acoustic Rain Gauge (ARG) analyses the underwater sound levels across a wide frequency range, classifies the observed spectrum according to likely source and then determines the local wind speed or rain rate as appropriate. Thispaper covers a trial on
Guymer, Trevor H. +5 more
core
Acoustic and Optical Surface Phonons [PDF]
, 1983 Very recently surface Brillouin scattering from opaque materials and electron energy loss spectroscopy from metallic surfaces with adsorbate were succesfully emplyed to detect surface phonons.
BORTOLANI, Virginio +4 more
core +1 more source
Advanced Functional Materials, EarlyView.A piezoelectric microacoustic wave device exploiting topologically protected interface states with significantly higher dynamic compliance than Lamb or Rayleigh modes achieves record‐high out‐of‐plane particle velocities exceeding 51 m/s. These findings indicate that leveraging topological interface states can overcome key limitations of piezoelectric ...
Onurcan Kaya +12 more
wiley +1 more source
Relying on critical articulators to estimate vocal tract spectra in an articulatory-acoustic database [PDF]
, 2010 We present a new phone-dependent feature weighting scheme that can be used to map articulatory configurations (e.g. EMA) onto vocal tract spectra (e.g. MFCC) through table lookup.
Felps, Daniel +5 more
core
Quantum interference between dark-excitons and zone-edged acoustic phonons in few-layer WS2
Nature Communications, 2023 Here, the authors investigate the Raman spectra of few-layered WS2 when the excitation energy is in resonance with the dark exciton, and observe a Fano resonance between dark excitonsand zone-edge acoustic phonons.
Qing-Hai Tan +10 more
doaj +1 more source
On the robustness of acoustic black hole spectra
Journal of Physics: Conference Series, 2011 We study the robustness of the spectrum emitted by an acoustic black hole by considering series of stationary flows that become either subsonic or supersonic, i.e. when the horizon disappears. We work with the superluminal Bogoliubov dispersion of Bose--Einstein condensates.
Finazzi, Stefano, Parentani, Renaud
openaire +2 more sources