نتایج جستجو برای: noise level
تعداد نتایج: 1250460 فیلتر نتایج به سال:
background: hospital is a place to provide medical services. it is affected by noise pollution sources that can be associated with negative impacts on health and comfort status of the staff members and patients. the aim of this study was to measure noise levels in different wards of hospitals and to determine the irritation caused by noise among the hospital staff members in hamadan, iran. meth...
Background and aims: Discharging compressed air through conventional single jet nozzles or open pipes is a common jet noise in industry. This study is aimed to reduce air blow gun jet noise by designing and fabrication of multiple jet nozzle as a substitute for conventional single jet nozzles. Methods: One of the most common commercial air blow gun equipped with a conventional single j...
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: Chronic occupational noise exposure may constitute a risk factor for cardiovascular disease for workers. The aim of this study was to investigate the relationship between occupational noise exposure and noise annoyance with blood pressure, serum cholesterol and triglyceride levels in workers of a textile industry. Material and Method: This cross-sectional study was carried out ...
Introduction: Among the environmental pollutions, noise is very important for its physiological and psychological effects on human. Traffic noise is one of the most important pollutants and the hospitals are one of the critical places regarding this type of noise. For these reasons, in the summer of 1382, the traffic noise of Mashhad main streets around the hospit...
In recent years, promising methods have been used to increase thermal efficiency, reduce nitrogen oxide and particle matter, which can be described as an example of an ethanol fuelled HCCI engine. But despite the many benefits of these engines, they continue to face problems such as increasing carbon monoxide production, unburned hydrocarbon, and producing combustion noise at high loads. In thi...
Background and aims : Among all systems that each person may interact with in daily life public transportation systems may expose them to various risks. The noise exposure of drivers can cause accidents through developing hearing loss and stress and consequent impact on driver’s safety performance. The main objective of this study was to evaluate the relation between noise exposure and occupa...
background: the adverse effects of noise are well known and noise problems due to industrialization of communities are increasing over the time. oil industries due to the process and nature of production; contain many noise sources such as compressors, turbines, and pumps, which cause excessive noise exposure. the objective of this study was to evaluate the noise characteristics of compressors ...
The article presents a method for estimating the level of discrete white noise in an image, based on use linear difference operators with vector mask. Two variants new are proposed, which differ accuracy obtained estimates and computational complexity. first version can be attributed to class block methods, whereas second one is intended rapid image analysis processing small number rows or colu...
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