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  • 65N30  (2)
  • Finite Elements  (2)
  • Doubled-haploid lines  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Analyse d'un élément mixte pour le problème de Stokes (1992)
    Springer
    Numerische Mathematik 62 (1992), S. 149-160 
    Details
    ISSN: 0945-3245
    Keywords: 65N30
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Description / Table of Contents: Résumé Nous considérons quelques extensions des résultats classiques d'estimation d'erreur pour les problèmes mixtes. Nous étudions en particulier l'effet de l'emploi d'une approximation non conforme et celui de la décomposition de la formeb(·,·) enb 1(·,·) etb 2(·,·). Nous employons cette dćomposition pour affiner certaines estimations dans le cas où la formea(·,·) n'est pas coercive dans la bonne norme. Nous considérons aussi des résultats de dualité dans le cas non conforme.
    Notes: Summary We consider some extensions of the classical error estimates for mixed problems. We take into account, in particular, nonconforming approximations and the splitting of the bilinear formb(·,·), intob 1(·,·) andb 2(·,·). We use this last fact to sharpen some estimates in a case where the forma(·,·) does not have coercivity in the right norm. We also consider duality results in the nonconforming case.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01396224
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Analyse d'un élément mixte pour le problème de Stokes (1992)
    Springer
    Numerische Mathematik 62 (1992), S. 161-188 
    Details
    ISSN: 0945-3245
    Keywords: 65N30
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Description / Table of Contents: Résumé Nous construisons un élément fini mixte pour le problème de Stokes. Cet élément est non conforme. Nous appliquons les résultats de la Partie I pour obtenir des estimations d'erreur optimales. Nous considérons aussi le traitement des conditions de raccords par des multiplicateurs de Lagrange et nous montrons que ces multiplicateurs peuvent être utilisés pour construire une approximation superconvergente.
    Notes: Summary We build a mixed finite element method for the Stokes problem. This method is nonconforming. We apply the results of Part I to prove convergence and obtain optimal error estimates. We also consider the treatment of interface conditions by multipliers and show that a superconvergent approximation can be built from those multipliers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01396225
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Random amplified polymorphic DNA and pedigree relationships in spring barley (1993)
    Springer
    Theoretical and applied genetics 85 (1993), S. 976-984 
    Details
    ISSN: 1432-2242
    Keywords: Kinship coefficient ; Polymerase chain reaction ; Genetic markers ; Hordeum vulgare ; Doubled-haploid lines
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We investigated random amplified polymorphic DNA (RAPD) in 27 inbred barley lines with varying amounts of common ancestry and in 20 doubled-haploid (DH) lines from a biparental cross. Of 33 arbitrary 10 base primers that were tested, 19 distinguished a total of 31 polymorphisms. All polymorphisms were scored as dominant genetic markers except for 1, where Southern analysis indicated the presence of two codominant amplification products. The inheritance of 19 RAPD polymorphisms and one morphological trait was studied in the DH lines. There was no evidence for segregation distortion, but a group of four tightly linked loci was detected. The frequencies of RAPD polymorphism in pairs of inbred lines were used to compute values of genetic distance (d), which were compared to kinship coefficients (r) between the same pairs of lines. A linear relationship between r and d was evident, but low values of r gave poor predictions of d. Cluster analysis showed that groups of inbred lines based on r were similar to those based on d with some notable exceptions. RAPD markers can be used to gain information about genetic similarities or differences that are not evident from pedigree information.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00215037
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Experiments with several elements for viscous incompressible flows (1985)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 5 (1985), S. 911-928 
    Details
    ISSN: 0271-2091
    Keywords: Incompressible ; Finite Elements ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: We present a numerical procedure to eliminate internal nodes from elements designed to approximate incompressible flow problems. We compare six elements in academic and industrial like flow problem and we discuss their relative qualities. A surprising conclusion is that richer elements may behave less well than simple ones if a good enforcement of incompressibility is not maintained.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650051005
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Simulation of forming processes by FEM with a Bingham fluid model (1986)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 6 (1986), S. 197-218 
    Details
    ISSN: 0271-2091
    Keywords: Bingham Fluids ; Forming Process ; Non-Newtonian Flows ; Finite Elements ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: We model the forming process as a fluid flow. A finite element program, FIDAP, which analyses flow problems, was used to calculate velocity and strain rates at points throughout the material during the deformation process. This allows predictions to be made on the shape and quality of the resulting part. The stress-strain relation we used models the plastic flow of metals (Bingham fluids). The FEM approximation of such a fluid is tested by comparing results for a simple analytical example. In forming processes provision must be made for friction between dye and workpiece, and the program was modified accordingly. Two classical ring forming simulations are compared to published results.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650060403
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    Paper (German National Licenses)
    Fulltext
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