نتایج جستجو برای: noise control
تعداد نتایج: 1505459 فیلتر نتایج به سال:
本稿では不快な騒音を音で制御・低減するアクティブノイズコントロール（ANC）について，これまでの技術の変遷を展望するとともに最近の動向について解説する．ANCはスピーカ（二次音源）からの制御音により騒音源（一次音源）からの騒音を制御・低減する技術であり，近年ではノイズキャンセリングヘッドホンなどを通じて一般にもその技術が広く知られるようになった．しかしながら，オフィスやイベント会場などの公共空間や車内や住宅内などの交通・住環境において，三次元的に騒音を制御することは未だ広くは実用化されていない．このような音空間において三次元的に騒音制御を実現するためには乗り越えるべき課題が多々残されている．本稿では，まずANCシステムを実装する上で重要となる消音領域（ZoQ）を任意の位置に移動させるバーチャルセンシングについて，代表的な3手法を紹介するとともに，それらの性能比較を示す．また，フィード...
Introduction: After presbycusis, noise-induced hearing loss is the second most common cause of acquired hearing loss. Numerous studies have shown that high-intensity noise exposure increases free radical species; therefore, use of antioxidants to detoxify the free radicals can prevent cellular damage in the cochlea. We studied the potential hearing protective effect of different doses of ascorb...
Background: Noise Induced Hearing Loss (NIHL) is one of the most common occupational diseases in the world. About 16% of hearing loss is associated with noise exposure in the workplaces. The aim of this research was investigation of the relationship between noise exposure and hearing loss. Methods: This cross-sectional study was conducted in 2010 on1062 workers in Tabriz Tractor Manufacturing ...
This study was conducted to determine the combined effects of noise and shift work on physiological parameters including body temperature, heart rate and blood pressure. This study was performed in a chemical industry in Tehran in 1993. The workers’ physiological parameters was recorded at the beginning and at t...
Background: Noise pollution is one of the most important environmental pollutions that affects human health in different dimensions. The current study aimed to survey the effects of noise pollution on residents of the Samen district in Mashhad. Methods: To understand the psychological effects that noise pollution caused by vehicles has on people, 400 questionnaires designed to gather demograph...
Background & Aims of the Study: Among the environmental pollutions, noise pollution, due to the potential physiological and psychological effects on humans, is of a particular importance. Exposure to noise can result in hearing loss in citizens. Health risks from noise associated with road traffic. Noise health effects are the health consequences of elevated sound levels. This ...
Background and Objective : Noise is considered as a common occupational health hazard in a wide range of occupational settings including oil and gas industries and related companies. This research aimed to assess the environmental noise and personal exposure in a petrochemical plant. Method: First, environmental noise measurement was performed as recommended by ISO9612 (1997) and next, shor...
background: noise-induced hearing loss (nihl) is one of the most common occupational illnesses. most of the studies on nihl were conducted at high noise levels that people are rarely exposed to but in industries. the function of the outer hair cells (ohcs) is impaired after exposure to industrial noise. distortion product otoacoustic emissions (dpoaes) are useful in examination of noise-induced...
Background: This study aimed to investigate the inhibitory effects of simultaneous formaldehyde (FA) and noise exposure on the sperm kinematic parameters sexual hormones in male mice. Materials and Methods: Forty eight NMRI adult male mice were randomly assigned to control group and experimental groups which were exposed to formaldehyde vapour (10 ppm) (F), noise (100 dB) (N), and simultaneous ...
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