51,699 research outputs found
Sound separation probe
Probe separates sound waves from turbulent flow pressure fluctuations in ducted airstreams by using principle that sound waves and turbulent flow pressure perturbations travel at different velocities
Sound waves in hadronic matter
We argue that recent high energy CERN LHC experiments on transverse momenta
distributions of produced particles provide us new, so far unnoticed and not
fully appreciated, information on the underlying production processes. To this
end we concentrate on the small (but persistent) log-periodic oscillations
decorating the observed spectra and visible in the measured ratios . Because such
spectra are described by quasi-power-like formulas characterised by two
parameters: the power index and scale parameter (usually identified
with temperature ), the observed log-periodic behaviour of the ratios
can originate either from suitable modifications of or (or both, but
such a possibility is not discussed). In the first case becomes a complex
number and this can be related to scale invariance in the system, in the second
the scale parameter exhibits itself log-periodic oscillations which can be
interpreted as the presence of some kind of sound waves forming in the
collision system during the collision process, the wave number of which has a
so-called self similar solution of the second kind. Because the first case was
already widely discussed we concentrate on the second one and on its possible
experimental consequences.Comment: 10 pages, 4 figures. Presented at the XLVII International Symposium
on Multiparticle Dynamics (ISMD2017) held in Tlaxcala City, Mexico, during
September 11-15, 201
Acoustic excitations and elastic heterogeneities in disordered solids
In the recent years, much attention has been devoted to the inhomogeneous
nature of the mechanical response at the nano-scale in disordered solids.
Clearly, the elastic heterogeneities that have been characterized in this
context are expected to strongly impact the nature of the sound waves which, in
contrast to the case of perfect crystals, cannot be completely rationalized in
terms of phonons. Building on previous work on a toy model showing an
amorphisation transition [Mizuno H, Mossa S, Barrat JL (2013) EPL {\bf
104}:56001], we investigate the relationship between sound waves and elastic
heterogeneities in a unified framework, by continuously interpolating from the
perfect crystal, through increasingly defective phases, to fully developed
glasses. We provide strong evidence of a direct correlation between sound waves
features and the extent of the heterogeneous mechanical response at the
nano-scale
Phonocardiograph transducer Patent
Piezoelectric transducer for monitoring sound waves of physiological origi
- …