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Τι (ποιος) είναι Quadrature - ορισμός
WIKIMEDIA DISAMBIGUATION PAGE
Quadrature (disambiguation)
Quadrature
·adj A quadrate; a square.
II. Quadrature ·adj The integral used in obtaining the area bounded by a curve; hence, the definite integral of the product of any function of one variable into the differential of that variable.
III. Quadrature ·adj The position of one heavenly body in respect to another when distant from it 90°, or a quarter of a circle, as the moon when at an equal distance from the points of conjunction and opposition.
IV. Quadrature ·adj The act of squaring; the finding of a square having the same area as some given curvilinear figure; as, the quadrature of a circle; the operation of finding an expression for the area of a figure bounded wholly or in part by a curved line, as by a curve, two ordinates, and the axis of abscissas.
Quadrature
Waves or periodic motions the angle of lag of one of which, with
reference to one in advance of it, is 90°, are said to be in
quadrature
with each other.
[Transcriber's note: If the voltage and current of a power line are in
quadrature, the power factor is zero (cos(90°) = 0) and no
real power
is delivered to the load.]
quadrature
['kw?dr?t??]
¦ noun
1. Mathematics the process of constructing a square with an area equal to that of a circle or other curved figure.
2. Astronomy the position of the moon or a planet when 90° from the sun in the sky.
3. Electronics a phase difference of 90° between two waves of the same frequency.
Origin
C16: from L. quadratura 'a square', from quadrare (see quadrate).
Βικιπαίδεια
Quadrature
Quadrature may refer to:
In signal processing:
- Quadrature amplitude modulation (QAM), a modulation method of using both an (in-phase) carrier wave and a 'quadrature' carrier wave that is 90° out of phase with the main, or in-phase, carrier
- Quadrature phase, oscillations that are said to be in quadrature if they are separated in phase by 90° (π/2, or 𝜆/4)
- Quadrature filter, the analytic signal of a real-valued filter
- Quadrature phase-shift keying (QPSK), a phase-shift keying of using four quadrate points on the constellation diagram, equispaced around a circle
In mathematics:
- Quadrature (mathematics), drawing a square with the same area as a given plane figure (squaring) or computing that area
- Quadrature of the circle
- Numerical integration is often called 'numerical quadrature' or simply 'quadrature'
- Gaussian quadrature, a special case of numerical integration
- Formerly, a synonym for "integral"
- Integral
- Antiderivative
- Addition in quadrature, combining the magnitude of uncorrelated signals by taking the square root of the sum of their squares
In physics:
- In Optical phase space, quadratures are operators which represent the real and imaginary parts of the complex amplitude; see also in-phase and quadrature components
In astronomy:
- Quadrature (astronomy), the position of a body (moon or planet) such that its elongation is 90° or 270°; i.e., the body-earth-sun angle is 90°
In Hedge-funds:
- Quadrature (hedge-fund), the quant hedge-fund created in 2010, in London, England.
Quadrature may also refer to:
- Quadrature encoder, a device that detects mechanical position changes and direction of movement
- Illusionistic ceiling painting, sometimes called quadrature after the Italian term, quadratura
- La Quadrature du Net (Squaring of the Net in French), a French advocacy group that promotes digital rights and freedoms of citizens
- "Quadrature", a song by Squarepusher from the album Just a Souvenir
