Low-frequency noise has been shown to cause certain functional changes in the organism of laboratory animals that manifest in changes of the state of the regulatory systems and metabolic disturbances at cellular and subcellular levels. The obtained data support the hypothesis of the mechanism of injurious effect of this physical factor including two basically correlated ways, i.e. the central mechanism associated with overexcitation of the hypotalamohypophysis-adrenal system and mediating the homeostatic parameters of the body, and the local one which is determined by a direct effect of low-frequency noise on highly organized structure of membraneous and genetic apparatus of cells.
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J Acoust Soc Am
January 2025
National Key Laboratory of Underwater Acoustic Technology, Harbin Engineering University, Harbin 150001, China.
With the vigorous development of maritime trade, the frequency band from 100 to 1500 Hz of shallow-sea ambient noise is not only affected by surface wind-induced noise but also the contribution of ship noise. Shallow-sea ambient noise can be described by a linear combination of surface wind-induced noise sources and ship noise sources. By using the correspondence between the real part of the vertical coherence and vertical energy flux, this work establishes a combined noise source model based on vertical coherence.
View Article and Find Full Text PDFAdv Mater
January 2025
School of Energy, School of Optoelectronic Science and Engineering, School of Biology and Basic Medical Sciences, School of Physical Science and Technology, Soochow University, Suzhou, 215000, P. R. China.
Human hearing cannot sensitively detect sounds below 100 Hz, which can affect the physical well-being and lead to dizziness, headaches, and nausea. Piezoelectric acoustic sensors still lack sensitivity to low-frequency sounds owing to the low piezoelectric coefficient or high elastic modulus of materials. The low elastic modulus and substantial piezoelectric coefficient of molecular ferroelectric materials make them excellent candidates for acoustic sensors.
View Article and Find Full Text PDFJASA Express Lett
January 2025
Department of Imaging Sciences, University of Rochester, Rochester, New York 14642, USA.
Eur Radiol Exp
January 2025
Unit of Medical Physics, Pisa University Hospital "Azienda Ospedaliero-Universitaria Pisana", Pisa, Italy.
ACS Appl Mater Interfaces
December 2024
Department of Electronic Engineering, Jeonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju 54896, Republic of Korea.
In this study, we investigate the origins of low-frequency noise (LFN) and 1/ noise in CuO thin-film transistors (TFTs). The static direct current (DC) - characterization demonstrates that the channel resistance () contributes significantly to mobility degradation in the TFTs, with channel thickness () controlled through the plasma-enhanced atomic layer deposition (PEALD) process. The 1/ noise followed the Hooge mobility fluctuation (HMF) model, and it was observed that both Coulomb and phonon scattering within the channel, which increased with a decrease in , contributed simultaneously.
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