OBJECTIVE To determine the prevalence of hearing loss associated with occupational noise exposure and other risk factors. DESIGN A cross-sectional study involving 269 exposed and 99 non-exposed subjects (non-industrial noise exposed subjects) randomly selected. Current noise exposure was estimated using both sound level meter and noise-dosimeter. Past noise exposure was estimated by interview...

The objective of this study is to analyze and assess the impact of traffic noise from newly expanded Bangkok-Chonburi Motorway, which links Bangkok-the capital of Thailand to Pattaya-the famous beach resort in the eastern seaboard of the country, with the utilization of visualized noise mapping technique in plan view and cross-section of this motorway. The newly expansion of main roadways of th...

BACKGROUND aircraft noise has been associated with several health effects. Because of the great success of low-cost flights, small airports have been turned into international airports thus exposing nearby residents to an increase in noise levels and potential disturbances and health disorders. OBJECTIVE to estimate the exposure levels and evaluate the health impact of aircraft noise on resid...

Noise pollution assessment was carried out in selected traffic junctions of Imphal city Manipur, India, using noise parameters and indices such as L10, L50, L90, Leq for the different periods day, i.e., morning, noon, evening hours. The study equivalent level (Leq), parameters, various have enabled evaluation overall environment city. index (TNI), climate (NC), (LNP), exposure (NEI) along with ...

In order to study noise levels associated with electronic arcade games, noise measurements were made in 3 selected game centers and 192 samples were taken in each location. The background noise was recorded at a level of 61 dB(A) and 64 dB(C). When the electronic games were performed these levels of noise reached to 88 approximately 90 dB(A). The 1/3 octave bands analyzing sound pressure levels...

This study attempted to investigate the effect of sound absorption on indoor environment for infants in nursery schools. The expected effects were reduction of noise level and improvement of speech intelligibility, and consequently lowered voice level of infants, which is known as Lombard effect. Polyester fiber boards were installed on the ceilings of three classrooms of a nursery school, whic...

The effects of nasal valve dilation on snoring and obstructed breathing were studied in 11 patients with habitual snoring and/or obstructive sleep apnea. The anterior part of the nose, the valve region, was dilated by means of a plastic device. Ten patients underwent polysomnographic investigation including pulse oximetry and measurement of snoring noise with and without the nasal dilator in a ...

In this paper we will generalize a singular value inequality that was proved before. In particular we obtain an inequality for numerical radius as follows: begin{equation*} 2 sqrt{t (1-t)} omega(t A^{nu}B^{1-nu}+(1-t)A^{1-nu}B^{nu}) leq omega(t A + (1- t) B), end{equation*} where, $ A $ and $ B $ are positive semidefinite matrices, $ 0 leq t leq 1 $ and $ 0 leq nu leq frac{3}{2}.$