ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Numerische Mathematik 53 (1988), S. 739-739 
    ISSN: 0945-3245
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Numerische Mathematik 56 (1989), S. 775-787 
    ISSN: 0945-3245
    Keywords: AMS(MOS): 65R20 ; 65D32 ; CR: G1.9
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary In this paper we consider the so-called generalized airfoil singular integral equation, with a smooth input function, and present “ad hoc” quadrature rules to compute efficiently the elements of collocation and Galerkin matrices.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Numerische Mathematik 86 (2000), S. 655-683 
    ISSN: 0945-3245
    Keywords: Mathematics Subject Classification (1991): 65R20, 45B05, 33A65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary. To solve 1D linear integral equations on bounded intervals with nonsmooth input functions and solutions, we have recently proposed a quite general procedure, that is essentially based on the introduction of a nonlinear smoothing change of variable into the integral equation and on the approximation of the transformed solution by global algebraic polynomials. In particular, the new procedure has been applied to weakly singular equations of the second kind and to solve the generalized air foil equation for an airfoil with a flap. In these cases we have obtained arbitrarily high orders of convergence through the solution of very-well conditioned linear systems. In this paper, to enlarge the domain of applicability of our technique, we show how the above procedure can be successfully used also to solve the classical Symm's equation on a piecewise smooth curve. The collocation method we propose, applied to the transformed equation and based on Chebyshev polynomials of the first kind, has shown to be stable and convergent. A comparison with some recent numerical methods using splines or trigonometric polynomials shows that our method is highly competitive.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Numerische Mathematik 52 (1988), S. 219-240 
    ISSN: 0945-3245
    Keywords: AMS(MOS):65R20 ; 65D32 ; CR: G1.4
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary In this paper we present a product quadrature rule for the discretization of the well-known linear transport equation in slab geometry. In particular we give an algorithm for constructing the weights of the rule and prove that the order of convergence isO(n −3+δ ), δ〉0 small as we like. Numerical examples are given, and our formula is also compared with product Simpson rules. Finally, we examine a Nyström method based on our quadrature.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Numerische Mathematik 81 (1998), S. 273-291 
    ISSN: 0945-3245
    Keywords: Mathematics Subject Classification (1991): 65D30
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract. In this paper we compare G(p), the Mellin transform (together with its analytic continuation), and $\overline{\overline{G}}(p)$ , the related Hadamard finite-part integral of a function g(x), which decays exponentially at infinity and has specified singular behavior at the origin. Except when p is a nonpositive integer, these coincide. When p is a nonpositive integer, $\overline{\overline{G}}(p)$ is well defined, but G(p) has a pole. We show that the terms in the Laurent expansion about this pole can be simply expressed in terms of the Hadamard finite-part integral of a related function. This circumstance is exploited to provide a conceptually uniform proof of the various generalizations of the Euler-Maclaurin expansion for the quadrature error functional.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Computing 29 (1982), S. 337-354 
    ISSN: 1436-5057
    Keywords: Primary 65D30 ; Cauchy principal value integrals ; poles ; quadrature rules ; convergence ; algorithms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung In dieser Arbeit untersuchen wir die numerische Integration (d. h. die Bestimmung des Hauptwertes im Sinne von Cauchy) von Funktionen mit mehreren reellen Polen erster Ordnung. Wir beschreiben Quadraturformeln vom interpolatorischen Typus, die von Delves, Hunter, Elliott-Paget und anderen Autoren gegeben sind: einige einfache Verallgemeinerungen werden vorgeschlagen und berechnungstechnische Fragen werden diskutiert. Endlich geben wir einen alternativen Algorithmus zum Ausrechnen von Integralen der Form
    Notes: Abstract In this paper we examine the numerical integration (in the Cauchy principal value sense) of functions having (several) first order real poles. We give a survey of results concerning some quadrature formulas of interpolatory type proposed by Delves, Hunter, Elliott and Paget, and several other authors; along with the description we present some minor generalizations and make comments on the computational aspects. Finally, we propose an alternative algorithm for the numerical evaluation of integrals of the form
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Computing 37 (1986), S. 31-42 
    ISSN: 1436-5057
    Keywords: Primary 65D32 ; secondary 65R20 ; Cauchy principal value integral ; singular integral equations ; quadrature rules ; convergence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung In dieser Arbeit konstruieren wir eine interpolatorische Quadraturformel der Form $$\mathop {\rlap{--} \smallint }\limits_{ - 1}^1 \frac{{f'(x)}}{{y - x}}dx \approx \sum\limits_{i = 1}^n {w_{ni} (y)f(x_{ni} )} ,$$ wobeif(x)=(1−x)α(1+x)β f 0(x), α, β〉0, und {xni} dien Nullstellen des Chebyshevpolynomsn-ten Grades vom ersten TypT n (x) sind. Ferner geben wir ein Konvergenzergebnis an und untersuchen das Verhalten der Größe $$ \sum\limits_{i = 1}^n {|w_{ni} (y)|} $$ , fürn→∞.
    Notes: Abstract In this paper we construct an interpolatory quadrature formula of the type $$\mathop {\rlap{--} \smallint }\limits_{ - 1}^1 \frac{{f'(x)}}{{y - x}}dx \approx \sum\limits_{i = 1}^n {w_{ni} (y)f(x_{ni} )} ,$$ wheref(x)=(1−x)α(1+x)β f o(x), α, β〉0, and {x ni} are then zeros of then-th degree Chebyshev polynomial of the first kind,T n (x). We also give a convergence result and examine the behavior of the quantity $$ \sum\limits_{i = 1}^n {|w_{ni} (y)|} $$ asn→∞.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 29 (1978), S. 983-986 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Zusammenfassung Mit Hilfe einer einfachen notwendigen Bedingung für die Knoten wird gezeigt, daß keine erweiterten Gauß-Laguerre- bzw. Gauß-Hermite-Quadraturformeln (vom Kronrod-Typ) mit positiven Gewichten existieren, wenn im Falle der ersterenn〉0, im Falle der letzterenn=3 odern〉4 gilt.
    Notes: Abstract A simple necessary condition on the nodes is used to establish that extended Gauss-Laguerre and Gauss-Hermite quadrature formulas (Kronrod type) do not exist with positive weights whenn〉0 in the Laguerre case andn=3 orn〉4 in the Hermite case.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Computational mechanics 22 (1998), S. 1-11 
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract We consider hypersingular integral equations associated with 2D boundary value problems and defined on domains given by piecewise smooth parametric representations. In particular, given any (polynomial) local basis, we consider all integrals whose evaluation is required when the equations are solved by Galerkin BEM. In order to compute these integrals we use very efficient numerical schemes, recently proposed, which require the user to define a mesh, not necessarily uniform, on the boundary and to specify the local degrees of the approximant. Therefore these rules are quite suitable for the construction of p- and h-p versions of Galerkin BEM.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 40 (1997), S. 1977-1999 
    ISSN: 0029-5981
    Keywords: Galerkin ; hypersingular BIE ; singular integrals ; quadrature rules ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: We consider hypersingular integral formulation of some elasticity and potential boundary value problems on 2-D domains. In particular, we consider all integrals whose evaluation is required when the equations are solved by a Galerkin BEM based on piecewise polynomial approximants of arbitrary local degrees. In order to compute these integrals, we use very efficient formulas recently proposed, which require the user to define a mesh, not necessarily uniform, on the boundary and specify the local degrees of the approximant. These rules are quite suitable for the construction of h-p version of the BEM. Implementation of h-, p- and h-p methods are applied to some classical problems and several numerical results are presented. © 1997 by John Wiley & Sons, Ltd.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...