Maryam Nikpour; Omid Rahaei
Abstract
Abstract:The interior of airport lounges is often exposed to a lot of noise, which can increase the risk to human health. Due to the dangers of high noise pollution for airport users, the present study was conducted to reduce noise pollution in the transit lounges of Ahvaz International Airport.Background ...
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Abstract:The interior of airport lounges is often exposed to a lot of noise, which can increase the risk to human health. Due to the dangers of high noise pollution for airport users, the present study was conducted to reduce noise pollution in the transit lounges of Ahvaz International Airport.Background and Aim:This study is considered interdisciplinary and applied research and its method is a combination of experimental, simulation and case study methods. firstly, the acoustic status of Ahwaz International Airport was obtained experimentally by measuring the amount of noise pollution during the test period (8 AM to 2 PM) by the Brüel & Kjær sound level meter model 2260 B&K in twelve places. Then the sound absorbing plates were tested with different geometric models. After proving the validity and reliability of the research, the experiments were performed by simulation using EASE 4.4 software.Materials and methods:In this study, the noise level of the airport lounge is considered as a dependent variable and four sound indices including, reverberation time (RT) (main index), indirect sound index (STI), total sound pressure level (SPL) and auditory error coefficient (〖AL〗_CONSE ) were evaluated according to the international standards ISO3382 and ISO 3382-1.Results:After the simulation, it was found that the use of raster pattern sound-absorbing plates (Model A in research) in walls and ceilings with different frequencies has the lowest sound pressure and the above-studied indices are at a desirable level. As a result, Model A has the greatest effect on reducing noise in the tested space.
Gharibreza Nazerirad; Fatemeh Zare Mehrjerdi; Fatemeh Khojasteh
Abstract
Abstract
Background and Aim: Environmental noise pollution can cause physical and mental disorders, especially in cities. This study aimed to investigate the effects of Low-Frequency (LF) and High-Frequency (HF) noise on anxiety and sleep disorder in male rats.
Materials and Methods: Fifteen male Wistar ...
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Abstract
Background and Aim: Environmental noise pollution can cause physical and mental disorders, especially in cities. This study aimed to investigate the effects of Low-Frequency (LF) and High-Frequency (HF) noise on anxiety and sleep disorder in male rats.
Materials and Methods: Fifteen male Wistar rats were randomly divided into three groups: 1) control group (no exposure to noise), 2) group exposed to low-frequency traffic noise (LF group), and 3) group exposed to high-frequency traffic noise (HF group). Sleep duration was monitored by CCTV. Anxiety-like behaviors were measured using the Elevated Plus Maze (EPM).
Results: The results of the EPM test showed that time spent in the open arm was significantly lower in the HF group than in the control (P <0.05). Sleep duration was significantly lower in rats exposed to LF and HF noise (P <0.01). There was no significant difference in sleep duration between the HF and LF groups.
Conclusion: Exposure to high and low-frequency noise can reduce sleep duration and high-frequency noise can increase anxiety-like behavior in rats.