A REVIEW OF PRACTICAL METHODS FOR REDUCING UNDERWATER NOISE POLLUTION FROM LARGE COMMERCIAL VESSELS

2021 ◽  
Vol 156 (A2) ◽  
Author(s):  
R C Leaper ◽  
M R Renilson
Keyword(s):  
Noise Level ◽  
Ambient Noise ◽  
Noise Pollution ◽  
Underwater Noise ◽  
Ambient Noise Level ◽  
Noise Impact

The paper provides an interesting and rather complete overview of the reasons for reducing shipping noise and the possible ways to achieve this. It is in particular interesting to note that the majority of noise impact is probably caused by the noisiest 10% of ships, and that the ambient noise level in the oceans increased by around 20 dB compared to pre-industrial conditions.

High ambient noise levels in Vadodara City, India, affected by urbanization

2016 ◽  
Vol 31 (4) ◽  
Author(s):  
Neha Singh ◽  
Hitesh Dhiman ◽  
Sadaf Shaikh ◽  
Purvish Shah ◽  
Roma Sarkar ◽  
...  
Keyword(s):  
Noise Level ◽  
Urban Areas ◽  
Ambient Noise ◽  
Noise Pollution ◽  
Unsupervised Classification ◽  
Sound Level ◽  
Continuous Exposure ◽  
Ambient Noise Level ◽  
High Level ◽  
The City

AbstractThe present research was conducted to study the urbanization of Vadodara city and to monitor the ambient noise level in the industrial, commercial, residential and silence zones of the city. A settlement map created by unsupervised classification for the land use and land cover study of Vadodara city clearly shows the increasing pattern of urbanization in its central part, which may be the result of urban sprawl due to migration of people from the rural to the urban areas. The fluctuation in ambient noise level was recorded using an A-weighted sound level meter in all the four zones of Vadodara city for 3 h at regular intervals of 15 min on 3 consecutive days at the same time. The results showed the highest equivalent noise level of 93.7 dBA in the commercial zone followed by 85.5 dBA in the industrial zone, 73.2 dBA in silence zone, and 70.2 dBA in the residential zone. The values of noise level were high in all the zones of the city increasing remarkably over the prescribed limit given in the Noise Pollution (Control and Regulation) Rules, 2000. Continuous exposure to such high level of noise may lead to detrimental effect on people.

The Professional Voice and Airline Flight

1984 ◽  
Vol 92 (3) ◽  
pp. 251-254 ◽  
Author(s):  
Robert J. Feder
Keyword(s):  
Noise Level ◽  
Ambient Noise ◽  
Protective Measure ◽  
Standard Practice ◽  
Ambient Noise Level ◽  
Cabin Temperature ◽  
The World ◽  
Voice User ◽  
Professional Voice ◽  
Airline Flight

As the world shrinks and demands for quality performers precipitously increase around the globe, travel becomes an important part of the professional's life. The professional voice user may encounter many circumstances and situations over which he has little control and which may subject him to potential vocal irritation or injury. Airline travel is an aspect that, by and large, is uncontrollable but absolutely necessary for professional survival, yet it may have the potential for harm. The majority of airline traffic is carried by wide-bodied aircraft, mainly the Boeing 747 and 767, the Lockheed L1011, the McDonnell Douglas DC-10, and the European Airbus. Similar but smaller aircraft include the Boeing 707, 727, and 737 and the McDonnell Douglas DC-8 and DC-9. Basically, these aircraft appear to exhibit relatively similar in-flight environments, including ambient noise level, cabin temperature, pressurization, humidity, and ozone. Each of these factors will be discussed to clarify aspects of flight which have been taken for granted, about which there have been misconceptions, or which have not been sufficiently considered. As otolaryngologists it is incumbent on us to be familiar with the consequences of flight for those patients with actual or potential voice problems. A voice lost to professional endeavor may be more emotionally devastating than an ear or sinus impairment. Careful briefing of the patient who is a professional voice user has not been standard practice prior to airline flight but certainly should be strongly considered as a protective measure.

scholarly journals Spectral Probability Density for Broadband Seismic Ambient Noise Level

2021 ◽  
Vol 1 (1) ◽  
pp. 17-21
Author(s):  
Endah Puspita Sari ◽  
Melda Panjaitan ◽  
Hery Sunandar ◽  
Erida Wati
Keyword(s):  
Time Series ◽  
Probability Density ◽  
Noise Level ◽  
Ambient Noise ◽  
Quality Of Information ◽  
Seismic Ambient Noise ◽  
Ambient Noise Level ◽  
Test Execution ◽  
Time Series Approach

The time-series approach is commonly utilized to get to the estimation of the likelihood thickness work of control ghostly densities (PDF PSD) of waveform information. This paper is concerned with the introduction of the evaluation of waveform commotion to degree the likelihood thickness work (PDF) be done inside, we utilized the metadata from a stock, a parser occurrence of DNP (Denpasar, Bali, Indonesia), IGBI (Ingas, Bali, Indonesia), and PLAI (Plampang, NTB, Indonesia) from BMKG IA-Networks and computations are based on the schedule utilized by McNamara Demonstrate. The point of this paper to characterize the current and past execution of the stations and recognizing the data on clamor levels at BMKG IA-Networks Station. The result of this paper shows the consistency of the unearthly is displayed the DNP, IGBI, and PLAI organize to confirm the quality of information conjointly acts as a test execution broadband arrange to the time taken by the broadband organize within the field and examination the Lombok earthquake in 2018.

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