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NOISE POLLUTION AND ITS EFFECT ON URBAN AREAS presentation


Posted by: seminar presentation
Created at: Saturday 01st of May 2010 09:11:28 AM
Last Edited Or Replied at :Saturday 01st of May 2010 09:11:28 AM
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It is measured in hertz. Audible frequency is a periodic vibration whose frequency is audible to average human.
Weighting networks
¢ The simplest method of measuring noise pollution is by assessing linear sound pressure level over a broad frequency level band covering the whole of audible frequency band.
¢ Filtering networks are used to measure the sensation whose sensitivity varies as that of hum..................[:=> Show Contents <=:]



NOISE POLLUTION


Posted by: seminar class
Created at: Monday 28th of March 2011 01:24:12 AM
Last Edited Or Replied at :Wednesday 13th of February 2013 10:54:58 PM
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cal effects affecting biological functions
d) Endocrine and hormonal changes relating to stress and noise levels. i.e. raised adrenaline and cholesterol.
e) Psychological effects; physical and mental fatigue, loss of concentration, lower efficiency……………..
Cardiovascular effects
Noise has been associated with important cardiovascular health problems. In 1999, the World Health Organization concluded that the available evidence showed suggested a weak association between long-term noise exposure above 67-70 dB(A) and hypertension. More recent studies have suggested that noi..................[:=> Show Contents <=:]



noise pollution and control in chemical industry


Posted by: srestha das
Created at: Friday 25th of February 2011 10:53:25 PM
Last Edited Or Replied at :Saturday 30th of April 2011 12:32:52 AM
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This is srestha Das.
i need to find about noise pollution happening in a particular industry and how can it be controlled????..................[:=> Show Contents <=:]



NOISE POLLUTION AND CONTROL IN CHEMICAL INDUSTRY


Posted by: nishantjr
Created at: Wednesday 22nd of September 2010 06:37:35 AM
Last Edited Or Replied at :Thursday 30th of September 2010 10:09:06 AM
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I am a student studying chemical engineering in thrissur government engineering co..................[:=> Show Contents <=:]



NOISE POLLUTION AND ITS EFFECT ON URBAN AREAS presentation


Posted by: seminar presentation
Created at: Saturday 01st of May 2010 09:11:28 AM
Last Edited Or Replied at :Saturday 01st of May 2010 09:11:28 AM
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Decibel

Decibel is widely used as measure of sound level. The ratio of the lowest sound power level to loudest power level is approximately one to one million.
Sound Power level, Lw= 10 log10 (W/ Wref)
Sound Pressure level , Lp= 20 log10 (P/ Pref)

Parameters that affect measurement


Sound Pressure Level vs. Distance from the Source
Attenuation of Sound
Wind Effects
Air Absorption
Temperature Gradient
Ground Attenuation






Sources causing Noise Pollutio..................[:=> Show Contents <=:]



noise barriers full report


Posted by: project report tiger
Created at: Monday 15th of February 2010 02:06:39 AM
Last Edited Or Replied at :Monday 15th of February 2010 02:06:39 AM
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(1) the construction of a highway on a new location or (2) the reconstruction of an existing highway to either significantly change the vertical or horizontal alignment or increase the number of through- traffic lanes. If the state transportation department identifies potential impacts, it must implement abatement measures, possibly including the construction of noise barriers, where reasonably and feasible.
2. MECHANISM OF NOISE PROPOGATION
Noise is defined as unwanted sound. It propagates through different media either sound or liquid or gas. In case of air, it propagates in the form of ..................[:=> Show Contents <=:]



NOISE POLLUTION AND CONTROL IN CHEMICAL INDUSTRY


Posted by: seminar projects crazy
Created at: Friday 30th of January 2009 01:00:49 PM
Last Edited Or Replied at :Friday 30th of January 2009 01:00:49 PM
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evel. Noise and industry always goes togethe..................[:=> Show Contents <=:]



AUTOMOBILE POLLUTION


Posted by: seminar projects crazy
Created at: Friday 30th of January 2009 12:43:19 PM
Last Edited Or Replied at :Friday 30th of January 2009 12:43:19 PM
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he started thinking about air pollution control devices and he became successful in inventing some devices which reduced the pollution up to certain limit. There are certain rules and specifications that have to be followed by automobile and they have to use devices to limit as per the specificati..................[:=> Show Contents <=:]



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