نتایج جستجو برای: passive noise control
تعداد نتایج: 1562069 فیلتر نتایج به سال:
background and aims: Hospital acoustics, noisy equipment and people have adversely impacts on patient’s physical and mental health. This paper aims to identify the major sources of noise and noise control techniques in hospitals of Behbahan Methods: Noise measurement was done according to ISO9612 at designated stations. Equivalent sound pressure levels were measured at 243...
While ideally noise should be reduced at the source, in the military environment the most effective solution in terms of both cost and operational effectiveness has been to provide personnel with personal hearing protection. This protection may be in the form of either an earplug that occludes the ear canal or a circumaural protector that inserts a barrier between the ambient noise and the ear....
On-chip decoupling capacitors (decaps) are widely used to reduce power supply noise by placing them at the appropriate locations on the chip between blocks. While passive decaps can provide a certain degree of protection against IR drop, if a problem is found after the physical design is completed, it is difficult to implement a quick fix to the problem. In this paper, we investigate the use of...
Background: Liver is an important organ that responsible for biological detoxification. There are few studies about the effect of co-exposure to organic solvents and noise on hepatic system enzymes. The study aim was to assess the effects of short-term exposure to noise and styrene on rat liver enzymes. Materials and Methods: In this experimental study, we studied the liver enzymes of male r...
We study the effect of randomly distributed diffusivities and speeds in two models for active particle dynamics with passive fluctuations. demonstrate how non-Gaussian displacement distributions emerge these long time limit, including Cauchy-type exponential (Laplace) shapes. Notably resulting shapes considered here are striking contrast to diffusion models. For motion our discussion points out...
conclusions it seems that noise pollution has harmful effects on the fertility of males. also these findings may suggest the use of a natural curative approach rather than pharmaceutical drugs to optimize both neuroendocrine gonadal axis and testicular integrity induced by pathogenesis stress, and enhance fertility capacity in men. background this study was conducted to examine the efficacy of ...
Introduction: Nowadays, noise exposure is one of the most important industrial health problems. Noise exposure can cause hearing loss and many other health problems. So, paying attention to the noise exposure problem should be of main priority in industrial health programs. This study was conducted in an oil producing region, aimed to assess noise pollution and noise induced hearing loss. Met...
Background and aims: Based on various studies, the noise can have a significant effect on human health. Annoyance is the most common bad effect that may be caused by the noise and traffic. Awareness of costs of traffic noise has various advantages in decision making and on control measures to reduce the traffic noise. Therefore, the purpose of this study is to analyze the costs of traffic noi...
Introduction: Noise is one of the most important physical agents in the workplace which causes numerous effects on physical and mental health. Hence its elimination or control is necessary in noisy industrial workplaces. Saab dyamples device is one of the most important sources of noise in the sub line in granite industry. Thus, this study intended to reduce noise using enclosure method i...
background: the effect of smoking cigarettes is followed by diverse effects on ovaries and developing follicles but the effect of passive smoking on ovarian function is unknown. on the other hand, the ovarian response to induction is a very important step in assisted reproduction. the aim of this study is to compare ovarian response in passive smokers and non-passive smokers in an assisted repr...
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