enow.com Web Search

Search results

1. Results from the WOW.Com Content Network

2. Day-night average sound level - Wikipedia

   en.wikipedia.org/wiki/Day-Night_Average_Sound_Level

   The day-night average sound level (Ldn or DNL) is the average noise level over a 24-hour period. The noise level measurements between the hours of 22:00 and 07:00 are artificially increased by 10 dB before averaging. This noise is weighted to take into account the decrease in community background noise of 10 dB during this period.

3. EPNdB - Wikipedia

   en.wikipedia.org/wiki/EPNdB

   Detailed information on measurement of aircraft acoustic signature to meet the requirements of Annex 16 is found in ICAO Document 9501 [5] and IEC 61265. [6] Data acquisition in one-third-octave bands is required, followed by processing to yield a logarithmically-scaled value in decibels relative to a sound pressure of 20 micropascals for each one-third-octave band.

4. Day–evening–night noise level - Wikipedia

   en.wikipedia.org/wiki/Day–evening–night_noise...

   The day–evening–night noise level or L den is a 2002 European standard to express noise level over an entire day. It imposes a penalty on sound levels during evening and night [ 1 ] and it is primarily used for noise assessments of airports , busy main roads, main railway lines and in cities over 100,000 residents.

5. Sound level meter - Wikipedia

   en.wikipedia.org/wiki/Sound_level_meter

   A noise dosimeter (American) or noise dosemeter (British) is a specialized sound level meter intended specifically to measure the noise exposure of a person integrated over a period of time; usually to comply with Health and Safety regulations such as the Occupational Safety and Health (OSHA) 29 CFR 1910.95 Occupational Noise Exposure Standard ...

6. Weighting filter - Wikipedia

   en.wikipedia.org/wiki/Weighting_filter

   A-weighting is only really valid for relatively quiet sounds and for pure tones as it is based on the 40-phon Fletcher–Munson equal-loudness contour. [3] The B and C curves were intended for louder sounds (though they are less used) while the D curve is used in assessing loud aircraft noise .

7. KFC Has an All-New $5 Bowl—Plus, 3 Returning Fan Favorites

   www.aol.com/kfc-5-bowl-plus-3-200000281.html

   KFC is known for its crispy fried chicken made with 11 herbs and spices—but that’s not all the fast food chain has to offer. Over the last year, it has gone above and beyond, expanding the ...

8. Trump announces $20B US investment by Emirati businessman - AOL

   www.aol.com/news/trump-announces-20b-us...

   President-elect Donald Trump on Tuesday announced a $20 billion investment for data centers in the United States by an Emirati company led by billionaire Hussain Sajwani, a close business partner ...

9. Stereoplotter - Wikipedia

   en.wikipedia.org/wiki/Stereoplotter

   With the introduction of computers, the analytical stereoplotter became a popular machine of choice for photogrammetry in the late 1960s to 1970s. A stereoplotter is an instrument that uses stereo photographs to determine elevations for the purpose of creating contours on topographic maps. Computers brought the capability to execute more ...