QUADRATURE

in astronomy, arrangement of two celestial bodies at right angles to each other as viewed from a reference point. If the reference point is the earth and the sun is one of the bodies, a planet is in quadrature when its elongation is 90°. As viewed from the earth, the half-moon is in quadrature to the sun. The inferior planets (Mercury and Venus) never reach quadrature; the superior planets each have two points of quadrature in their orbits.

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The Columbia Encyclopedia, Sixth Edition Copyright© 2004, Columbia University Press. Licensed from Lernout & Hauspie Speech Products N.V. All rights reserved.

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Questia Books and Articles on: Quadrature
We found: 558 results
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366  

 

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181  

 

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4  

 

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1  

 

Encyclopedia articles:

 

6  
 

books on: Quadrature  - 366 results

       More book Results: 1-10 11-20 21-30 31-40 41-50 >>  
 
1.
Computational Methods for the Study of Dynamic Economies
Book by Ramon Marimon, Andrew Scott; Oxford University, 1999
Subjects: Equilibrium (Economics)--Mathematical Models--Congresses, Macroeconomics--Computer Simulation--Congresses, Macroeconomics--Mathematical Models--Congresses
...numerical integration. If I apply Gaussian quadrature which is typically done , then equation 6.17 is replaced by 6.18 where 1 are the quadrature weights and the grid points k l are the quadrature abscissae . See Press et al. , 1986...
2.
Computational Methods for the Study of Dynamic Economies
Book by Ramon Marimon, Andrew Scott; Oxford University Press, 2001
Subjects: Equilibrium (Economics)--Mathematical Models--Congresses, Macroeconomics--Computer Simulation, Macroeconomics--Computer Simulation--Congresses, Macroeconomics--Mathematical Models--Congresses
...numerical integration. If I apply Gaussian quadrature (which is typically done), then equation...17) is replaced by where l are the quadrature weights and the grid points k l are the quadrature abscissae . (See Press et al. , 1986...
3.
Item Response Theory for Psychologists
Book by Susan E. Embretson, Steven P. Reise; Lawrence Erlbaum Associates, 2000
Subjects: Item Response Theory, Psychometrics
...number of specified values are called quadrature nodes . Typically, the densities or...conducted in this chapter, we set up 61 quadrature nodes that ranged from = -3.0 to...10 increments. The densities at each quadrature node Qr are called weights W Q r , and...
4.
Philosophy of Mathematics and Mathematical Practice in the Seventeenth Century
Book by Paolo Mancosu; Oxford University Press, 1996
Subjects: Mathematics--Europe--Philosophy--History--17th Century
...able to prove there is no algebraic quadrature of the circle. Moreover, the discussion on whether the quadrature of the circle was possible was still...Theologiques 1634 to the topic, "La quadrature du cercle est-elle impossible...
5.
Chambers's Technical Dictionary
Book by C. F. Tweney, L. E. C. Hughes; Macmillan, 1958
Subjects: Technology--Dictionaries
...between the quadrate and the jugal. quadrature Astron. . The position of the moon...in question are at right- angles. quadrature component Elec. Eng. . See reactive component. quadrature reactance Elec. Eng. . A term used...
More book Results: 1-10 11-20 21-30 31-40 41-50 >>

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journal articles on: Quadrature  - 181 results

       More journal Results: 1-10 11-20 21-30 31-40 41-50 >>  
 
1.
Comparison of Partially Measured Latent Traits across Nominal Subgroups
Journal article by Jon D. Cohen, Tao Jiang; Journal of the American Statistical Association, Vol. 94, 1999
Subjects: Education, Educational research--Methods, United States. National Assessment of Educational Progress--Research
...defining Q.sub.1 x Q.sub.2 quadrature points corresponding to theta and x...standard normal density function. We use quadrature over fixed equidistant points varying...through the foregoing formula. We use quadrature over the same set of equally spaced...
2.
Fitting Full-Information Item Factor Models and an Empirical Investigation of Bridge Sampling
Journal article by Xiao-Li Meng, Stephen Schilling; Journal of the American Statistical Association, Vol. 91, 1996
Subjects: Curve fitting--Research, Discriminant analysis--Models, Factor analysis--Models, Item response theory--Research
...reliance on Fixed-point Gauss -- Hermite quadrature, which can produce appreciable numerical...via fixed-point Gauss -- Hermite quadrature. This turns out to be a problematic...data model. Third, the numerical quadrature method used for the E step can be unreliable...
3.
Approximations to Multivariate Normal Rectangle Probabilities Based on Conditional Expectations
Journal article by Harry Joe; Journal of the American Statistical Association, Vol. 90, 1995
Subjects: Multivariate analysis--Research, Statistics (Data)--Research, Statistics--Research
...evaluated by multidimensional numerical quadrature or Monte Carlo simulation; alternatively...1992), the use of numerical quadrature was too time-consuming for dimensions greater than five. Numerical quadrature has computational time (and memory...
4.
Bayesian Statistics Using Mathematica
Journal article by Peyton Cook, Lyle D. Broemeling; The American Statistician, Vol. 49, 1995
Subjects: Bayesian statistical decision theory--Research, Mathematica 1.1 (Mathematical software)--Usage, Mathematical statistics--Usage
...analysis of the marginal distributions by quadrature as well as Monte Carlo. Section 5 describes...parameter: (1) an exact analysis using quadrature, and (2) a Monte Carlo analysis...the posterior moments for Phi. Using quadrature, EPhi where z = .283 with SD(Phi...
5.
Micro-Robots Based Learning Environments for Continued Education in Small and Medium Enterprises (SMEs)
Journal article by Pascal Leroux, Martial Vivet; Journal of Interactive Learning Research, 2000
Subjects: Continuing education--Equipment and supplies, Educational software--Product information, Employee training--Equipment and supplies, Instructional materials industry--Product information, Roboteach (Educational/training software)--Authorship, Robots--Usage, Small business--Training
...qualified persons in two projects: QUADRATURE (Vivet, Bruneau, Parmentier...our pedagogical environments. The QUADRATURE Project The first experiment proceeded within the framework of the QUADRATURE project, financed by the Ministry...
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magazine articles on: Quadrature  - 4 results

 
 
1.
The Cable Modem Picture Comes into Focus
Magazine article by Michael Finneran; Business Communications Review, Vol. 29, March 1999
Subjects: Broadband modems--Forecasts and trends, Cable modems, Internet--Forecasts and trends
...downstream data rate of 27 Mbps. The modem will use a 64-point Quadrature Amplitude Modulation (QAM) system, which encodes 6 bits...which will operate at 3.6 Mbps. The upstream modulation is Quadrature Phase Shift Keying (QPSK), which carries 2 bits per Hertz...
2.
V.fast: The Next Dial-Up Modem Standard. Are V.32 and V.32bis Modems Too Slow for You? Here Comes V.fast to the Rescue
Magazine article by Ken Krechmer; Business Communications Review, Vol. 21, June 1991
Subjects: Data communications--Innovations, International Telegraph and Telephone Consultative Committee--Management, Modems--Innovations, Telecommunications transmission technologies--Innovations, Telephone equipment, Telephone systems--Equipment and supplies
...necessary to achieve a data rate of 9,600 bps. At 2,400 bps, the V.22bis recommendation encodes signal space using quadrature amplitude modulation, which combines phase shift and amplitude modulation to achieve 16 possible four-bit constellation...
3.
The Sky in March
Magazine article by Joe Rao; Natural History, Vol. 113, March 2004
Subjects: Astrology, Planets
...It sets shortly after 3 A.M. local time on the 1st, and about two hours earlier by months end. The planet is at east quadrature (ninety degrees east of the Sun) on the 26th, and so from Earth we can more readily see the dark shadow the planet casts...
4.
The Sky in March
Magazine article by Joe Rao; Natural History, Vol. 112, March 2003
Subjects: Astronomy
...wonderful rings, tilted almost as far as they ever tilt toward Earth. Saturn will be 90 degrees east of the Sun, or at east quadrature, on March 13. The long shadow the planet casts on its rings is easily seen from Earth, giving the ensemble a greater appearance...


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newspaper articles on: Quadrature  - 1 result

 
 
1.
Pounds 40m Boost for Electricity Firm
Newspaper article; The Birmingham Post (England), May 12, 2011
Subjects: Alstom S.A., Railroads
...forwards when the re-emergence comes. "We have an order book to complete and we will have to take advantage of the investment when it starts." A quadrature booster made by Stafford-based Alstom, which hopes to create 150 new jobs


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encyclopedia articles on: Quadrature  - 6 results

       More encyclopedia Results: 1-6 >>  
 
1.
Quadrature
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
QUADRATURE in astronomy, arrangement of two celestial...sun is one of the bodies, a planet is in quadrature when its elongation is 90 . As viewed from the earth, the half-moon is in quadrature to the sun. The inferior planets (Mercury...
2.
Elongation
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...When a planets elongation is 90 , it is in quadrature . When its elongation is 180 , it is in opposition . Elongation is measured east (eastern quadrature) or west (western quadrature) from the sun. The superior planets can have...
3.
Archimedes
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...Cylinder, On the Measurement of the Circle, On the Equilibrium of Planes, On Conoids and Spheroids, On Spirals, On the Quadrature of the Parabola, Arenarius or sand-reckoner, On Floating Bodies, and On the Method of Mechanical Theorems. Archimedes...
4.
Wallis, John
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...geometry at Oxford from 1649. He systematized the use of formulas, introduced the symbol for infinity, and made a study of the quadrature of curves, which he recorded in Arithmetica infinitorum (1655). His collected mathematical works appeared in three volumes...
5.
Geometric Problems of Antiquity
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...having twice the volume of the original cubical altar; (2) the trisection of an arbitrary angle; (3) the squaring, or quadrature, of the circle, i.e., the construction of a square whose area is equal to that of a given circle. These problems were...
More encyclopedia Results: 1-6 >>

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