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Topic: DB

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  Encyclopedia of Laser Physics and Technology - decibel, gain, loss, dB, dBm, dBc/Hz   (Site not responding. Last check: 2007-11-01)
The decibel (dB) is often used to quantify the gain of an amplifier or the loss of some optical element.
The number of decibels is 10 times the logarithm (with base 10) of the power amplification factor or loss factor, or alternatively 20 times the logarithm of the amplitude ratio.
For example, if the peak-to-peak modulation of an optical power is increased by a factor of 10, this increases the signal power by 20 dB, not 10 dB.
www.rp-photonics.com /decibel.html   (343 words)

 Encyclopedia entries starting with DB
DBPF (file format) - DB7 Volante - Db4o - DB - D.
- DBF - DBZ (meteorology) - DBDMH - D.B. Woodside
- DB Class 420 - DBI Stadium - D.
encycl.opentopia.com /D/DB   (40 words)

 Carnegie Mellon Libraries: DB: Routledge Encyclopedia of Philosophy   (Site not responding. Last check: 2007-11-01)
Carnegie Mellon Libraries: DB: Routledge Encyclopedia of Philosophy
Routledge Encyclopedia of Philosophy (REP) is the updated online version of the Routledge Encyclopedia of Philosophy published in 1998.
Copyright: Routledge, an imprint of the Taylor & Francis Group
www.library.cmu.edu /Search/DB/RoutledgePhil.html   (61 words)

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