quadrature
Contents
English[edit]
Etymology[edit]
From Latin quadrātūra.
Noun[edit]
quadrature (plural quadratures)
 The process of making something square; squaring.
 (mathematics) The act or process of constructing a square that has the same area as a given plane figure, or of computing that area.
 1976, D. T. Whiteside (editor), The Mathematical Papers of Isaac Newton, Volume 7: 16911695, Cambridge University Press, page 3,
 Craige was then on the point of publishing a short tract wherein he expounded a systematic (if far from general) 'Method of determining the quadrature of figures comprehended by straight lines and curves',^{[editor's translation]} there gathering a variety of techniques of rational algebraic quadrature and arcrectification […] .
 1976, D. T. Whiteside (editor), The Mathematical Papers of Isaac Newton, Volume 7: 16911695, Cambridge University Press, page 3,
 (mathematics, numerical analysis) The calculation of a definite integral by numerical means.
 1992, Bernard Bielecki, SINC Quadratures for Cauchy Principal Value Integrals, T.O. Espelid, Alan Genz, Springer, Numerical Integration: Recent Developments, Software and Applications, page 81,
 Three types of SINC quadratures are surveyed for the evaluation of Cauchy principal value integrals , , where is an arc in the complex plane. Under suitable assumptions on F, the quadrature errors are of order , where N is the number of quadrature nodes and c is a constant independent of N.
 2011, Narayan Kovvali, Theory and Applications of Gaussian Quadrature Methods, Morgan & Claypool, page 37,
 In this chapter, we present some example applications of the Gaussian quadrature methods discussed in the previous chapters. […] Figure 4.1 shows the accuracy of the polynomial Gaussian quadratures used to evaluate the first two integrals as a function of N.
 2015, Bernard Shizgal, Spectral Methods in Chemistry and Physics, Springer, page 71,
 The integral is thus given by a variant of the Fejér quadrature with two points at the interval boundaries, namely x_{1} = −1 and x_{N} = 1 analogous to the Lobatto quadratures of the next section.
 1992, Bernard Bielecki, SINC Quadratures for Cauchy Principal Value Integrals, T.O. Espelid, Alan Genz, Springer, Numerical Integration: Recent Developments, Software and Applications, page 81,
 (mathematics, analysis) The act or process of solving an indefinite integral by symbolic means.
 (astronomy) A situation in which the directions of two celestial bodies (or a celestial body and the Sun) form a rightangle from the perspective of the observer.

When the Moon is in quadrature, it appears in the sky as a halfmoon.

 (physics) The condition in which the phase angle between two alternating quantities is 90°.
 2008, Luis B. Oliveira, Jorge R. Fernandes, Igor M. Filanovsky, Chris J. M. Verhoeven, Manuel M. Silva, Analysis and Design of Quadrature Oscillators, Springer, page 33,
 If ν_{IN} has 50% dutycycle, then the outputs are in quadrature.
 2011, M. V. Deshpande, Electrical Machines, PHI Learning, page 315,
 The total mmf in a synchronous machine may be split up into two components—one along the pole axis or direct axis and the other at right angles to this or the quadrature axis. […] In the case of salient pole construction, however, the reluctances of the magnetic circuits on which the mmfs act are different along the direct axis and the quadrature axis.
 2015, Mohammad Elbadry, Ramesh Harjani, Quadrature Frequency Generation for Wideband Wireless Applications, Springer, page 7,
 Quadrature LO generation is critical to the operation of directdownconversion receivers [7]. Two common techniques for quadrature generation are dividebytwo frequency dividers, and polyphase filters.
 2008, Luis B. Oliveira, Jorge R. Fernandes, Igor M. Filanovsky, Chris J. M. Verhoeven, Manuel M. Silva, Analysis and Design of Quadrature Oscillators, Springer, page 33,
 (art) A painting painted on a wooden panel.
Derived terms[edit]
Related terms[edit]
Translations[edit]
squaring


mathematics


astronomy


physics: condition in which the phase angle is 90 degrees

See also[edit]
French[edit]
Noun[edit]
quadrature f (plural quadratures)
Italian[edit]
Noun[edit]
quadrature f
 plural of quadratura
Latin[edit]
Participle[edit]
quadrātūre
Categories:
 English terms derived from Latin
 English lemmas
 English nouns
 English countable nouns
 en:Mathematics
 en:Mathematical analysis
 en:Astronomy
 English terms with usage examples
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 French lemmas
 French nouns
 French feminine nouns
 French countable nouns
 Italian nonlemma forms
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