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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Reliable computing 1 (1995), S. 9-14 
    ISSN: 1573-1340
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Description / Table of Contents: Abstract Прелставлены точные формулы для вычнсления шнрнны произвеления нитервалов, являющиеся как более простыми, так н более зффективными, чем нспользовавшиеся до снх пор. Зти формулы могут быть полезны для приложений; кроме того, они прелставляют собой хорошнй ииструмент для оценки качества нитервального оиенивания. Доказтезательства таких формпл, вообше говоря, требппт разбора большого числа числа случаеВ и, соотсвенио, обБемных вычислений. Применение функкпионалов, инвариантных по отношений к определеннум интервальным преобразоаниям, позволило сократить сократить до минимума число слудаев иобБем вычислений.
    Notes: Abstract Sharp formulas for the width of the product of intervals are derived which are simpler and more effective than the ones previously known. These formulas are useful in applications and they are appropriate tools for estimating the quality of interval evaluations. Proofs of such formulas will, in general, result in a number of different cases involving longwinded calculations. By utilizing certain functionals which are invariants of appropriate interval transformations the calculations are reduced to the ones required for a minimum number of cases.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Reliable computing 6 (2000), S. 1-8 
    ISSN: 1573-1340
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Reliable computing 6 (2000), S. 39-60 
    ISSN: 1573-1340
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract In this paper we present a topologically correct and efficient version of the algorithm by Guibas and Stolfi (Algorithmica 7 (1992), pp. 381-413) for the exact computation of Delaunay and power triangulations in two dimensions. The algorithm avoids numerical errors and degeneracies caused by the accumulation of rounding errors in fixed length floating point arithmetic when constructing these triangulations. Most methods for computing Delaunay and power triangulations involve the calculation of two basic primitives: the INCIRCLE test and the CCW orientation test. Both primitives require the computation of the sign of a determinant. The key to our method is the exact computation of this sign and is based on an algorithm for determining the sign of the sum of a finite set of normalized floating point numbers of fixed mantissa length (machine numbers) exactly. The exact computation of the primitives allows the construction of the correct Delaunay and power triangulations. The method has been implemented and tested for the incremental construction of Delaunay and power triangulations. Tests have been conducted for different distributions of points for which non-exact algorithms may encounter difficulties, for example, slightly perturbed points on a grid or on a circle. Experimental results show that the performance of our implementation is comparable with that of a simple implementation of the incremental algorithm in single precision floating point arithmetic. For random distribution of points the exact algorithm is only 4 times slower than the inexact implementation. The algorithm is easy to implement, robust and portable as long as the input data to the algorithm remains exact.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of elasticity 11 (1981), S. 329-335 
    ISSN: 1573-2681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract This paper deals with the stress distribution in a homogeneous isotropic elastic hemisphere embedded in a semi-infinite homogeneous isotropic elastic medium when a rigid circular disc is clamped to the plane face of the hemisphere and the stresses are caused by the rotation of the disc through an angle β. The problem is reduced to the solution of a Fredholm integral equation of the second kind in the auxiliary function ψ(t). An analytical expression for the torque T required to rotate the die through an angle β is obtained in terms of ψ(t). The Fredholm integral equation is solved numerically, and the numerical values of T are graphed.
    Type of Medium: Electronic Resource
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  • 5
    Title: Light interaction with plants : a computer graphics perspective
    Author: Baranoski, Gladimir Valerio Guimaraes
    Contributer: Rokne, Jon G.
    Publisher: Chichester :Horwood Pub.,
    Year of publication: 2004
    Pages: xxx, 154 p. : , ill. (some col.)
    ISBN: 1-904275-11-7
    Type of Medium: Book
    Language: English
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