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Abstract This paper applies an efficient adaptive feedforward compensation (AFC) algorithm for periodic disturbance cancellation on hard disk drive (HDD) servo systems. Such an algorithm is shown to be equivalent to a linear time invariant (LTI) model. With the help of this equivalence, we can...
Abstract To explore the effects of infrasound on the memory function and neurogenesis in the rat hippocampus, BDNF and BrdU-labled neurons were investigated by the immunohistochemical method. After exposure to infrasound of 8Hz, 130dB for 14 days, the Morris water maze test was performed to...
Abstract The aim of this study was to assess annoyance related to low frequency noise (LFN) in employees of the control rooms and office-like areas. Subjects were 276 workers, aged 26–62 years, exposed to noise at A-weighted sound pressure level (SPL) of 41–66 dB. They were asked to assess noise...
When people are annoyed by low frequency noise, their first concern is to stop the noise. Therefore it is necessary to find the source of the noise. Unfortunately, not in every case is the source very obvious. In most cases a lot of potential sources are available both inside and outside the...
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