72 research outputs found
The Active Traveling Wave in the Cochlea
A sound stimulus entering the inner ear excites a deformation of the basilar
membrane which travels along the cochlea towards the apex. It is well
established that this wave-like disturbance is amplified by an active system.
Recently, it has been proposed that the active system consists of a set of
self-tuned critical oscillators which automatically operate at an oscillatory
instability. Here, we show how the concepts of a traveling wave and of
self-tuned critical oscillators can be combined to describe the nonlinear wave
in the cochlea.Comment: 5 pages, 2 figure
Observation of the Doubly Charmed Baryon Ξ++cc
A highly significant structure is observed in the
mass spectrum, where the baryon is reconstructed in the decay
mode . The structure is consistent with originating from a weakly
decaying particle, identified as the doubly charmed baryon . The
difference between the masses of the and states
is measured to be , and the mass is then
determined to be , where the last uncertainty is due to
the limited knowledge of the mass. The state is observed in a
sample of proton-proton collision data collected by the LHCb experiment at a
center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of
1.7 , and confirmed in an additional sample of data collected
at 8 TeV.Comment: All figures and tables, along with any supplementary material and
additional information, are available at
https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2017-018.htm
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