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Topic: Bromwich integral


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In the News (Wed 1 Oct 14)

  
  Bromwich integral - Wikipedia, the free encyclopedia
In mathematics, the Bromwich integral or inverse Laplace transform of F(s) is the function f(t) which has the property
The Bromwich integral is thus sometimes simply called the inverse Laplace transform.
The Bromwich integral, also called the Fourier-Mellin integral, is a line integral defined by:
en.wikipedia.org /wiki/Bromwich_integral   (172 words)

  
 West Bromwich Community Page
West Bromwich, "the little village on the heath of broom" from which it gets its name, was the property of William Fitz Ansculf of Dudley Castle.
West Bromwich has the remains of a Benedictine Priory which dates back from 1130 and which suffered as most did in the dissolution of the monastaries in 1525.
Suprisingly even West Bromwich does not seem to make much of its obvious attractions and seems prepared to be content with travellers passing through it on their way to some other destination.
www.birminghamuk.com /westbromwich.htm   (607 words)

  
 Project history   (Site not responding. Last check: 2007-10-13)
Numerical integration of the Bromwich integral was one of the techniques used.
This research was broadened to other integral transforms and, in the light of Fourier transforms, to computation of oscillatory integrals.
This routine is the basis for ADAPT of Malik and Alan Genz and DCUHRE of Jarle Berntsen, Terje Espelid and Alan Genz.
www.cs.kuleuven.ac.be /onderzoek/nines/research/histni.html   (369 words)

  
 PlanetMath: Mellin's inverse formula
In practice, computing the complex integral can be done by using the Cauchy residue theorem.
Cross-references: Cauchy residue theorem, complex integral, real parts, real axis, imaginary axis, parallel, line, straight, Lebesgue measure, point, real function, continuous, piecewise, Laplace transform, inverse, function
g(t) by g(e^{-t})=f(t) we obtain the Laplace inversion formula, moreover, we can prove this one independently from the Fourier integral theorem and under somewhat broader assumptions.
planetmath.org /encyclopedia/BromwichIntegral.html   (309 words)

  
 Entry Duffy:1993:NIL from toms.bib   (Site not responding. Last check: 2007-10-13)
The first method is a straightforward application of the trapezoidal rule to Bromwich's integral.
The second method, developed by Weeks [22], integrates Bromwich's integral by using Laguerre polynomials.
The third method, devised by Talbot [18], deforms Bromwich's contour so that the integrand of Bromwich's integral is small at the beginning and end of the contour.
www.math.utah.edu /ftp/pub/tex/bib/idx/toms/19/3/333-359.html   (103 words)

  
 Series - LoveToKnow 1911   (Site not responding. Last check: 2007-10-13)
It follows that the general term of a recurring series is of the form E4(n)a n, where c5(n) is a rational integral algebraic function of n, and a is independent of n.
The series whose general term is of the form Ka n + (n), where 4)(n) is a rational integral algebraic function of degree r, is a recurring series whose scale of relation is (I - ax) (I - x) +l, but the general term of this series may be obtained by another method.
In the series so far considered the terms are actual numbers, or, at least, if the terms are functions of a variable, we have considered the convergency only when that variable has an assigned value.
www.1911ency.org /S/SE/SERIES.htm   (4868 words)

  
 The Historicity and Historicisation of Arthur
When the 'historical' references are pulled out of their context and viewed in isolation then, as we have seen, they may possibly represent the distorted traditions of a historical figure but at least equally as well they may not.
Bromwich, 1978a, p.274; Thomas, 1995, p.389) of Arthur from the early Welsh genealogies.
Bromwich, R., Jarman, A.O.H. and Roberts, B.F. (edd.) 1991, The Arthur of the Welsh.
www.arthuriana.co.uk /historicity/arthur.htm   (9629 words)

  
 Amazon.com: "contour integral": Key Phrase page   (Site not responding. Last check: 2007-10-13)
The inversion of Laplace transform via the Bromwich contour integral is discussed.
Let the pole be at the point zo and consider the contour integral around this CHAPTER 4 pole, as shown in Fig.
The contour integral and the residue theorem in the complex frequency domain are introduced in this chapter.
www.amazon.com /phrase/contour-integral   (437 words)

  
 Laplace transform
In mathematics and in particular, in functional analysis, the Laplace transform of a function f(t) defined for all real numbers t ≥ 0 is the function F(s), defined by:
This integral transform has a number of properties that make it useful for analysing linear dynamical systems.
Also, the output of a linear dynamic system can be calculated by convolving its unit impulse response with the input signal.
www.xasa.com /wiki/en/wikipedia/l/la/laplace_transform.html   (369 words)

  
 Forced magnetic reconnection due to an error field
In the next section, we present a method to calculate the inversion of the Laplace transform by use of an integral equation for the reconnected fluxes.
The kernel of the integral equation is given by the inverse Laplace transform of
The Bromwich integral consists of the sum of residues at the poles, R(t), and the integral along the branch cut (c
epub.iaea.org /fusion/subscribe/41/dec/ms7107IshizA/7107.html   (2846 words)

  
 Course Descriptions
Revision of contour integrals, Cauchy’s theorem, Cauchy’s integral formula and the residue theorem.
Deduction of new integrals from known ones by shift of contour.
Extension to the case in which the transform variable is complex and the inverse transform is a contour integral.
www.ma.man.ac.uk /DeptWeb/UGCourses/Syllabus/MT3211.html   (356 words)

  
 Bromwich integral - the free encyclopedia   (Site not responding. Last check: 2007-10-13)
Laplace transform of F(s) is the function f(t) which has the property
Laplace transform and the inverse Laplace transform together have a number of properties that make them useful for analysing
The Bromwich integral, also called the Fourier-Mellin integral, is a
www.the-free-web-encyclopedia.com /default.asp?t=Bromwich_integral   (78 words)

  
 Numerical Inverse Laplace Transform | MaplePrimes
With all of that said, using the Bromwich Integral might be a better method for higher orders of "s".
Bromwich integral requires knowing the maximum real part of the poles.
These integrals with oscillating factor can be computed efficiently according to Mori and Ooura (the latter provides C and Fortran code, translate that to Maple and mildly increase precision for the nasty inversion problem).
beta.mapleprimes.com /blog/alec/numerical-inverse-laplace-transform-0   (1812 words)

  
 Numerical inversion of real-valued Laplace transforms. Regularization method by Vladimir Kryzhniy   (Site not responding. Last check: 2007-10-13)
In this case the original function can be computed by evaluation of the complex integral of inverse transformation.
In general, no one has needs in numerical inversion if the answer is known from the tables, unless it is too complicated.
Similarly, if a LT is known in complex half plane, the numerical inversion based calculations of the Bromwich integral (whenever it is possible) should result in a better output.
www-users.cs.umn.edu /~yelena/web/mathmethod.php   (920 words)

  
 Math 421 diary, fall 2005
Please notice that the arguments to the "factors" under the integral must have sum equal to t (the outside variable), and that there is a minus sign in one, and the integration variable (tau, the inside variable) in the other.
Notice now that the integral of the partial derivative with respect to x at x=0 is 0, but the derivative of the integral of the function with respect to y at x=0 is 1.
The integral is with respect to t, and t is the "dummy variable" in the integral.
www.math.rutgers.edu /~greenfie/mill_courses/math421b/diary.html   (12120 words)

  
 [No title]
Whittaker's method is well-known in the source distribution (assumed given) by a suitable choice of stream functions.
The Debye potentials and the Bromwich potentials are essentially radial components of the vector potentials of which Whittaker potentials are the real parts.
So in general the particular integral (i.e., the stream potentials) of the inhomogeneous Maxwell equations may be chosen such that the complementary function can be expressed in terms of only two scalars, which are components of the vector superpotentials.
www.cheniere.org /references/superpotential.htm   (600 words)

  
 J.A.C. (Andre) Weideman: Abstracts of Papers   (Site not responding. Last check: 2007-10-13)
Talbot's method for the numerical inversion of the Laplace Transform consists of numerically integrating the Bromwich integral on a special contour by means of the trapezoidal or midpoint rules.
Many computational problems can be solved with the aid of contour integrals containing exp(z) in the the integrand: examples include inverse Laplace transforms, special functions, functions of matrices and operators, parabolic PDEs, and reaction-diffusion equations.
One approach to the numerical quadrature of such integrals is to apply the trapezoid rule on a Hankel contour defined by a suitable change of variables.
dip.sun.ac.za /~weideman/abs.html   (2952 words)

  
 [No title]
Piessens, R. "Gaussian quadrature formulas for the numerical integration of Bromwich's integral and the inversion of the Laplace transform".
Widder D.V. : "A generalisation of Dirichlet's series and of Laplace's integral by means of a Stieljes integral", Trans.
Widder D.V. : "Necessary and sufficient conditions for the representation of a function by a Laplace integral", Trans.
www.douillet.info /~douillet/thesis/bib_lapl.html   (1226 words)

  
 THE HARMONIC OSCILLATOR IN PHYSICS - AND THEN SOME
The hard way is actually performing the inverse transform via a Bromwich integral derived from a Cauchy integral over suitable path in the complex s-plane, which may, and often does, express the answer as an infinite series anyhow.
We can get a first integral of the equation, which is usually helpful, by rewriting it as dv ------------- = - (w_0)² x(t) dt (1 - (v/c)²) which has the advantage of at least isolating the variable v on the LHS.
For a > 0, the indefinite integral of this approximating integrand containing the singularity is: ln(2 sqrt(a) sqrt(ax² - b) + 2ax) ----------------------------------- sqrt(a) showing that the turning point singularities are actually integrable, and not a source of problematic physics.
graham.main.nc.us /~bhammel/PHYS/sho.html   (13373 words)

  
 Football chant - Wikipedia, the free encyclopedia
They frequently contain vulgar or antagonistic lyrics; many of them would not be acceptable in a number of situations outside of a football stadium, and as long as the chants are not used outside of football, they are tolerated.
Football chants generally contribute to fans' enjoyment of a game and its atmosphere, and are an integral part of football culture.
This is particularly the case in English, Scottish, German and Dutch football in which national anthems are also sung at the beginning of international games.
en.wikipedia.org /wiki/Football_chant   (3266 words)

  
 ► » sinc() question
finite range of time, which may not be an integral multiple of Fs.
However the contour for the Bromwich integral is taken
Laplace transform, and the inverse Laplace transform is a Bromwich
www.fourelectronics.com /sinc-question-1283710.html   (1808 words)

  
 Diary for Math 421:02, spring 2004
Of course we recognize the integral as a convolution (this is a problem in a textbook, darn it!).
But the integral of t from -infty to +infty is "surely" 1 (well, I want it to have integral 1).
Approximate the integral by a Riemann sum using the left-hand endpoints as sample points.
www.math.rutgers.edu /~greenfie/mill_courses/math421/ltdiary.html   (10383 words)

  
 S.O.S. Mathematics CyberBoard :: View topic - Inverse Laplace
One way to do this is to use the well known Bromwich Integral for the Inverse Laplace transformation, but it demands some work to be done:
is a meromorphic function (analytic everywhere but in a finite set of points and with no essential singularities) on the left hand side of that line (on the complex plane), then you can calculate this integral (relatively) easily using contour integration (ie.
In order to compute the contour integral you have to find the singularities (in the case of a meromorphic function they are poles of finite order) and calculate their residues.
www.sosmath.com /CBB/viewtopic.php?p=8086   (404 words)

  
 Amazon.com: "Bromwich's Infinite": Key Phrase page   (Site not responding. Last check: 2007-10-13)
See all pages with references to Bromwich's Infinite.
Hardy's Pure Mathematics and Bromwich's Infinite Series were not available the first year.
Whittaker's Modern analysis had not yet spread so far, and Bromwich's Infinite series did not exist.
www.amazon.com /phrase/Bromwich's-Infinite   (390 words)

  
 Encyclopedia   (Site not responding. Last check: 2007-10-13)
In mathematics, the Bromwich integral or inverse Laplace transform of F(s) is the function f(t) which has the property :
The Bromwich integral, also called the Fourier-Mellin integral, is a path integral defined by: :
[http:/eqworld.ipmnet.ru/en/auxiliary/aux-inttrans.htm Tables of Integral Transforms] at EqWorld: The World of Mathematical Equations.
www.wikiworld.biz /bromwich_integral   (145 words)

  
 A closed form solution for constant flux pumping in a well under partial penetration condition
The Laplace domain solution is derived by the application of the Laplace transforms with respect to time and the finite Fourier cosine transforms with respect to the vertical coordinates.
A time domain solution is obtained using the inverse Laplace transforms, convolution theorem, and Bromwich integral method.
The effect of partial penetration is apparent if the test well is completed with a short screen.
www.agu.org /pubs/crossref/2006/2004WR003889.shtml   (283 words)

  
 FORTRAN77 Source Codes
toms353, a library of routines which estimate an integral involving a cosine or sine factor using Filon quadrature;
toms379, a library of routines which approximate the integral of a function;
toms706, a library of routines to estimate the integral of a function over a triangulated region;
www.csit.fsu.edu /~burkardt/f77_src/f77_src.html   (1847 words)

  
 Robin van Persie @ Arsenal.y2u.co.uk   (Site not responding. Last check: 2007-10-13)
These performances, including his playing an integral part in the 3-2 UEFA Cup final victory over Borussia Dortmund at the De Kuip on May 8, 2002, earned him the prestigious Best Young Talent award offered by the Dutch PFA for the 2001/02 season.
His return to the first team has been marked with numerous goals, the pinnacle of his achievements coming in the FA Cup semi-final against Blackburn Rovers where he scored two stunning goals to secure victory for Arsenal.
He also scored the vital breakthrough goal against West Bromwich Albion to help Arsenal secure second place in the Premiership after the Albion defence had proved difficult to break down.
arsenal.y2u.co.uk /Current_Players/Ar_robin_van_persie.htm   (712 words)

  
 NA Group Research Report NA-05/29
Parabolic and Hyperbolic Contours for Computing the Bromwich Integral
Some of the most effective methods for the numerical inversion of the Laplace transform are based on the approximation of the Bromwich contour integral.
The accuracy of these methods often hinges on a good choice of contour, and several such contours have been proposed in the literature.
web.comlab.ox.ac.uk /oucl/publications/natr/na-05-29.html   (138 words)

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