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Subject: Music

This US group was formed in Los Angeles, California, in 1978 by Steve Allen (guitar, vocals) and Ron Flynt (bass, vocals), two expatriate musicians from Tulsa, Oklahoma. Drummer Mike Gallo ...

ultrasonic

ultrasonic   Quick reference

A Dictionary of Construction, Surveying and Civil Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2020

...Very high sound frequencies above the human audio range, which are about 20...

oxygen

oxygen   Quick reference

A Dictionary of Construction, Surveying and Civil Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2020

...A gas at ambient temperature comprising 20% of the Earth’s...

specific gravity

specific gravity   Quick reference

A Dictionary of Chemical Engineering

Reference type:
Subject Reference
Current Version:
2014

...specific gravity The ratio of the density of a substance to the density of water at 20 º C. The specific gravity of water at 20°C is therefore 1.0. ...

audio spectrum

audio spectrum   Quick reference

A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018

...spectrum The range of sound frequencies that are audible to the human ear. This is typically considered to be the range from 20 to 20 000 hertz , a span of eleven octaves . ...

subsonic frequency

subsonic frequency   Quick reference

A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018

...frequency A frequency of value less than the lower limit of the human hearing range, i.e. frequencies below about 20 hertz. ...

ultrasound

ultrasound   Quick reference

A Dictionary of Mechanical Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2019

...ultrasound ( ultrasonic waves ) Inaudible sound waves, with frequencies greater than about 20 kHz up to many...

reference temperature

reference temperature   Quick reference

A Dictionary of Mechanical Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2019

...reference temperature (Unit K or °C) 1. In dimensional metrology, the reference temperature is 20°C. 2. See standard state...

normal temperature and pressure

normal temperature and pressure   Quick reference

A Dictionary of Mechanical Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2019

...normal temperature and pressure ( NTP ) Reference conditions defined by NIST as 20°C and 1 atm. See also standard state...

low-temperature solar collector

low-temperature solar collector   Quick reference

A Dictionary of Mechanical Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2019

...low-temperature solar collector A solar collector operating at temperatures a few degrees (maximum 20°C) above ambient. Swimming-pool heating is a typical...

spectrum

spectrum   Quick reference

A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018

...The range of possible frequencies that a particular (electrical) signal can have. For example, the audio spectrum is generally considered to extend from 20 hertz to 20 kilohertz, so a given audio signal will be found in this range, and a given instrument will have its own spectrum of frequencies or spectral response within this range. ...

geometric mean

geometric mean   Quick reference

A Dictionary of Chemical Engineering

Reference type:
Subject Reference
Current Version:
2014

...geometric mean A type of mean value that is the average value of a set of n numbers, and calculated by multiplying them together, and extracting the nth root of the product. For example, the geometric mean of 10, 20, and 40 is and is less than the arithmetic mean, which is (10 + 20 + 40)/3 = 23.33. ...

factorial

factorial   Quick reference

A Dictionary of Chemical Engineering

Reference type:
Subject Reference
Current Version:
2014

...factorial (Symbol !) The product of all the positive whole integers being considered. Note that 0! has a value of 1. For example, 5! is 0 × 1 × 2 × 3 × 4 × 5 = 20. ...

schedule number

schedule number   Quick reference

A Dictionary of Chemical Engineering

Reference type:
Subject Reference
Current Version:
2014

...schedule number A classification for pipes in terms of their wall thickness. There are ten schedule numbers in common usage: 10, 20, 30, 40, 60, 80, 100, 120, 140, and 160. ...

primary air

primary air   Quick reference

A Dictionary of Mechanical Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2019

...primary air In a combustor , the fraction (typically 15–20%) of the total air required for combustion which is introduced at the same time as the...

Doppler ultrasonic flowmeter

Doppler ultrasonic flowmeter   Quick reference

A Dictionary of Mechanical Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2019

...Doppler ultrasonic flowmeter A Doppler current meter where the frequency of the sound waves is in the ultrasonic region, i.e. above about 20 kHz. See also ultrasonic flow meter...

sonicator

sonicator   Quick reference

A Dictionary of Mechanical Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2019

...sonicator A high-frequency ( c. 20 kHz) sound generator used to agitate liquids. Applications include ultrasonic cleaning , agitation of suspended particles, dispersion of nanoparticles , and...

maximum allowable operating pressure

maximum allowable operating pressure   Quick reference

A Dictionary of Mechanical Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2019

...maximum allowable operating pressure (Unit Pa) The highest pressure at which any pressure system may be operated, usually 10 to 20% below the maximum allowable working pressure...

decibel

decibel   Quick reference

A Dictionary of Mechanical Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2019

...( G ) A logarithmic measure of the ratio of two variables, V 1 and V 2 say, defined by G (dB) = 20log 10 ( V 1 / V 2 ). By choosing a suitable reference value for V 2 the decibel can be used as a measure of a variable V 1 , rather than of the ratio between variables. For example, sound pressure level ( SPL ) is expressed in decibel by SPL (dB) = 20log 10 ( p/p REF ) where p is the sound pressure and p REF a reference pressure, normally taken as 20 μ ‎Pa. Because decibels are a logarithmic measure, they are additive when two variables expressed in...

low-frequency oscillator

low-frequency oscillator   Quick reference

A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018

...oscillator ( LFO ) An oscillator found in musical synthesizers operating at frequencies up to approximately 20 hertz. It is used to modulate the fundamental frequency or amplitude of the output sound, referred to as ‘vibrato’ or ‘tremolo’ respectively. ...

sound pressure level

sound pressure level   Quick reference

A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018
Subject:
Science and technology, Engineering and Technology
Length:
60 words
Illustration(s):
1

...pressure level ( SPL ) The root-mean-square (r.m.s.) pressure of a sound wave at a particular instant ( P actual ), usually expressed in decibels (dBSPL) with respect to the average threshold of hearing at 1 kilohertz ( P ref ) of 20 micropascal: ...

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