منابع مشابه
Upper Frequency Limit of Hearing – A New Screening Method or an Illusion?
The aim of this study was to develop a prototype generator with electro-acoustical connection, verify the parameters of the new apparatus, perform clinical trials in patients with normal hearing. A digital oscilloscope and artificial ear were used to check electrical and sound parameters. Sound intensity in the 0.5-20 kHz frequency range was 86.8 ± 9 dB SPL. This was followed by clinical trials...
متن کاملEvaluation of combined effect of organic solvents and noise by the upper limit of hearing.
To clarify the combined effects of organic solvents and noise on hearing, the upper limit of hearing was measured in 48 male workers exposed to organic solvents and/or noise in a factory producing plastic buttons. Measuring the organic solvent concentrations in working environments and breathing zone air, and the noise level in workplaces were also done. The readings suggested that most exposur...
متن کاملUpper altitude limit for Rayleigh lidar
It has long been assumed that Rayleigh lidar can be used to measure atmospheric temperature profiles up to about 90 or 100 km and that above this region the technique becomes invalid due to changes in atmospheric composition which affect basic assumptions on which Rayleigh lidar is based. Modern powerful Rayleigh lidars are able to measure backscatter from well above 100 km requiring a closer e...
متن کاملAn upper limit for macromolecular crowding effects
BACKGROUND Solutions containing high macromolecule concentrations are predicted to affect a number of protein properties compared to those properties in dilute solution. In cells, these macromolecular crowders have a large range of sizes and can occupy 30% or more of the available volume. We chose to study the stability and ps-ns internal dynamics of a globular protein whose radius is ~2 nm whe...
متن کاملHuman frequency-following responses: representation of second formant transitions in normal-hearing and hearing-impaired listeners.
Auditory nerve single-unit studies have demonstrated that phase-locking plays an important role in the neural encoding of the spectrum of speech-like sounds. Recently, it has been reported that the phase-locked activity underlying the scalp-recorded human frequency-following response (FFR) also encodes the first two formants of several steady-state vowels and the time-variant frequency presente...
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ژورنال
عنوان ژورنال: Nature
سال: 1951
ISSN: 0028-0836,1476-4687
DOI: 10.1038/167438c0