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Search Results: 1 - 10 of 3784 matches for " Noise "
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What Does “Noise Pollution” Mean?  [PDF]
Alice Elizabeth González
Journal of Environmental Protection (JEP) , 2014, DOI: 10.4236/jep.2014.54037

Noise features different characteristics that make it different from every other “classic” pollutant. Noise is invisible; it does not smell; it disappears when the source is turned off and leaves no traces in the environment. In addition, when people perceive something wrong about their hearing capacity, it is often long time after the beginning of noise exposure. This fact contributes to strengthening the misconception that noise is not harmful to human health or, at least, efforts and funds aim preferably at controling and decreasing the emission of other pollutants. Adding to this, most people tend to consider that noise is the price to pay for accessing to the amenities of the Technological Era and it is indivisible and inevitably linked to them. Last but not least, noise pollution could adversely affect ecosystems and ecological services. Then, how is it possible to convince the decision makers that noise pollution is one of the major current environmental problems? The aim of this paper is to discuss step by step the applicability of noise of a “pollution” definition, as a way to ease the understanding that lowering environmental noise levels should be prioritized: because it will lead to a healthier and better society.

Impact of Noise on Health: The Divide between Policy and Science  [PDF]
Arline L. Bronzaft
Open Journal of Social Sciences (JSS) , 2017, DOI: 10.4236/jss.2017.55008
Abstract: In her chapter “Sources of Noise” in Noise and Health, Annette Zaner [1] writes that sounds have been environmental pollutants for thousands of years, citing examples of stories of loud music in the Old Testament and noisy delivery wagons in ancient times. The Industrial Revolution and urbanization in more recent times raised the decibel levels in our communities, especially with the growth in transportation on the roads, on the rails and in the air, as well as the growth of noise polluting products. The proliferation of boom cars, cell phones and wind turbines during the past twenty years has made our world even noisier. Studies have been carried out that have demonstrated the potential impact of these noises on our mental and physical health, and there have been some efforts to lessen some of the intrusive sounds, e.g. aircraft and road traffic noise, but there is still too little attention paid to the deleterious effects of noise. While noise complaints top the list of complaints in major cities worldwide and noise even threatens the natural sound systems of our planet, there is no movement globally to address the noise pollutant. The following paper will examine the research linking noise to health effects, question why governments have not seriously attempted to lower noise levels and suggest ways to lessen the din. Doing so will not only be beneficial to our health and well-being but it would also be wise economically.
Annoyance and Health-Related Quality of Life: A Cross-Sectional Study Involving Two Noise Sources  [PDF]
Daniel Shepherd, David McBride, Kim N. Dirks, David Welch
Journal of Environmental Protection (JEP) , 2014, DOI: 10.4236/jep.2014.55043

Noise remains a potent degrader of health in many global contexts, capable of inducing severe annoyance and sleep disturbance. An epidemiological study was undertaken to compare noise annoyance and health-related quality of life of individuals residing close to a major international airport or wind turbine complex with those located in demographically matched areas. Results indicate that domains of health-related quality of life may be degraded in those living in areas more likely to induce noise annoyance. Furthermore, the addition of aviation noise to environments already encroached by road noise may induce further annoyance and degradations in health-related quality of life, indicating that one noise sources may not mask the impact of another.

A Variational Model for Removing Multiple Multiplicative Noises  [PDF]
Xuegang Hu, Yan Hu
Open Journal of Applied Sciences (OJAppS) , 2015, DOI: 10.4236/ojapps.2015.512075
Abstract: The problem of multiplicative noise removal has been widely studied in recent years. Many methods have been used to remove it, but the final results are not very excellent. The total variation regularization method to solve the problem of the noise removal can preserve edge well, but sometimes produces undesirable staircasing effect. In this paper, we propose a variational model to remove multiplicative noise. An alternative algorithm is employed to solve variational model minimization problem. Experimental results show that the proposed model can not only effectively remove Gamma noise, but also Rayleigh noise, as well as the staircasing effect is significantly reduced.
A Perceptual Approach to Reduce Musical Noise Using Critical Bands Tonality Coefficients and Masking Thresholds  [PDF]
Ch. V. Rama Rao, M. B. Rama Murthy, K. Srinivasa Rao
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2009, DOI: 10.4236/ijcns.2009.28085
Abstract: Traditional noise reduction techniques have the drawback of generating an annoying musical noise. A new scheme for speech enhancement in high noise environment is developed by considering human auditory system masking characteristics. The new scheme considers the masking threshold of both noisy speech and the denoised one, to detect musical noise components. To make them inaudible, they are set under the noise masking threshold. The improved signal is subjected to extensive subjective and objective tests. It is ob-served that the musical noise is appreciably reduced even at very low signal to noise ratios.
Numerical Modelling of Aerodynamic Noise in Compressible Flows  [PDF]
S?awomir Dykas, Sebastian Rulik, W?odzimierz Wroblewski
Open Journal of Fluid Dynamics (OJFD) , 2012, DOI: 10.4236/ojfd.2012.23007
Abstract: The solution of the AeroAcoustics (CAA) problems by means of the Direct Numerical Simulation (DNS) or even the Large Eddy Simulation (LES) for a large computational domain is very time consuming and cannot be applied widely for engineering applications. In this paper the in-house CFD and CAA codes are presented. The in-house CFD code is based on the LES approach whereas the CAA code is an acoustic postprocessor solving the non-linearized Euler equations for fluctuating (acoustic) variables. These codes are used to solve the aerodynamically generated sound field by a flow over a rectangular cavity with inlet Mach number 0.53.
Relationship between Urban Noise and the Health of Users of Public Spaces—A Case Study in Vitoria, ES, Brazil  [PDF]
Greicikelly Gaburro Paneto, Cristina Engel de Alvarez, Paulo Henrique Trombetta Zannin
Journal of Building Construction and Planning Research (JBCPR) , 2017, DOI: 10.4236/jbcpr.2017.52004
Abstract: Urban populations today are exposed to high levels of noise, which may cause discomfort and lead to health problems. Most of these noises are traffic-generated; therefore, this study focuses on evaluating the soundscapes of urban open spaces to determine its importance for the health of the citizen, since such spaces can function as noise attenuators. The methodology of this study involved a literature review, computer simulations and interviews with users of the aforementioned open spaces. The case study was conducted in an urban area in the city of Vitória, state of Espírito Santo, Brazil. The results indicate that, in the period of this study, traffic noise dissipated through open spaces but noise levels still exceeded the maximum allowable levels established by regulations. Nevertheless, the population proved to be largely unaware of the noise. It should be pointed out that the areas under study are used predominantly as recreational spaces for health and wellbeing activities. The findings of this study may serve to underpin urban planning policies that encourage the inclusion of open spaces, especially in areas of high urban density where the transport system consists of motor vehicles, in order to help control urban noise.
Performance of a New Method of Multicomponent Images Segmentation in the Presence of Noise  [PDF]
Sié Ouattara, Olivier Asseu, Alain Clément, Bertrand Vigouroux
Engineering (ENG) , 2011, DOI: 10.4236/eng.2011.311134
Abstract: Any undesirable signal limiting to a degree or another the integrity and the intelligibility of a useful signal can be considered as noise. In the general rule, the good performance of a system is assured only if the level of power of the useful signal exceeds by several orders of magnitude that of the noise (signal to noise of a several tens of decibels). However certain elaborate methods of treatment allow working with very low signal to noise ratio in an optimal way any a priori knowledge available on the signal useful to interpret. In this work, we evaluate the robustness of the noise on a new method of multicomponent image segmentation developed recently. Two types of additional noises are considered, which are the Gaussian noise and the uniform noise, with varying correlation between the different components (or planes) of the image. Quantitative results show the influence of the noise level on the segmentation method.
The Legal Regime of Noise Pollution in Nigeria  [PDF]
Hakeem Ijaiya
Beijing Law Review (BLR) , 2014, DOI: 10.4236/blr.2014.51001

Man is born with noise and dies with that, thus noise is part of human life and a natural product of human environment. Noise like smog, is a slow agent of death. Noise may not appear as a threat to global environment on the same level as deforestation, hazardous wastes or emission of poisonous gases into the atmosphere but if it continued the next 30 years as it has for the last 30 years, it could become lethal. Against this background, this paper examines noise as a factor harmful to the environment with focus on Nigeria. The paper looks at noise pollution in Nigeria and the legal regime relating to the problem. The paper examines how environmental law and other relevant sources of law endeavoured to tackle noise pollution in the country.

Comparison of Mental Health Status of People Exposed to Noise Pollution with People in Non-Polluted Areas of Sari  [PDF]
Abbas Masoudzadeh, Pezhman Hadinezhad, Maede Gooran
Health (Health) , 2017, DOI: 10.4236/health.2017.95059
Noise pollution in psychological terms is defined as an unpleasant, undesirable or unwanted sound and in quantitative terms, it is a sound possessing all different wavelengths and intensities with no certain combination which is unpleasant to ear. The present study was conducted to compare the mental health status of people exposed to noise pollution with people in non-polluted areas of Sari. The sample population in the present descriptive study included 200 people selected by Random sampling method. Then, Sari was divided into four areas in terms of noise pollution, and after implementing GHQ-28 questionnaire (which reliability and validity have been confirmed), general health as well as mental health of samples were compared with each other. Data analysis was conducted based on occupation and residence location using variance analysis tests and t-Test for quantitative data and Square-test for qualitative data. Complaints about physical difficulties in traders’ group working in non-polluted environment are lower than traders’ group working in an environment exposed to noise pollution. These complaints among residents in non-polluted areas are at the lowest level. In overall review, the prevalence and average of mental health disorders amongst traders in areas exposed to noise pollution are higher than traders in non-polluted areas. Average complaints about physical difficulties, anxiety and sleeping problems, problems with social performance, depression and in general average mental and physical disorders are higher in resident and working groups in areas exposed to noise pollution, however, only complaints about physical difficulties are statistically significant.
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