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  • 1980-1984  (5)
  • Engineering  (3)
  • Glycosaminoglycan  (2)
  • Esox lucius
  • Mitochondrial DNA
  • 1
    Electronic Resource
    Electronic Resource
    Stresses from arbitrary loads on a penny-shaped crack (1984)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 20 (1984), S. 2093-2105 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: An implementation of a solution to the problem of a penny-shaped crack in an infinite elastic solid with arbitrary normal and shear loads is described, and is used to generate the stresses corresponding to some simple crack loads. The program described is fast and stable, and is shown to give accurate results even if the crack loads are not of the desired polynomial form. Stress intensity factors are obtained directly from combinations of load constants.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620201111
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    On the finite-element calculation of turbulent flow using the k-∊ model (1984)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 4 (1984), S. 303-319 
    Details
    ISSN: 0271-2091
    Keywords: Finite Element ; Turbulent Flow ; 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: Although the finite-element (FE) method has been successful in analysing complex laminar flows, a number of difficulties can arise when two-equation turbulence models (e.g. the k-∊ model) are incorporated. This work describes a particular FE discretization of the k-∊ model and reports its performance in recirculating flow. Severe problems encountered in attempts to obtain convergence of the numerical scheme are isolated and analysed, and methods by which the problems can be overcome are suggested.Insight gained in this work has enabled a practical turbulent flow FE code to be constructed which is robust and efficient. This code is the subject of a further paper.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650040402
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A practical method of two-equation turbulence modelling using finite elements (1984)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 4 (1984), S. 321-336 
    Details
    ISSN: 0271-2091
    Keywords: 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: Incorporation of the k-∊ turbulence model into Galerkin finite-element fluid-flow codes (which, unlike upwind finite-difference codes, have no artificial damping) can lead to severe iterative convergence difficulties. This paper introduces an alternative turbulence model (the q-f model) and an associated finite-element discretization method which are designed to overcome these problems. The new model forms the basis of a finite-element fluid-flow code which is robust and efficient. Furthermore, it is demonstrated on a practical example that the code can give good agreement with experiment on fairly coarse meshes.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650040403
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Comparison of cartilage destruction between infectious and adjuvant arthritis (1983)
    Hoboken, NJ [u.a.] : Wiley-Blackwell
    Journal of Orthopaedic Research 1 (1983), S. 136-143 
    Details
    ISSN: 0736-0266
    Keywords: Glycosaminoglycan ; Collagen ; Proteoglycan ; Infectious arthritis ; Adjuvant arthritis ; Articular cartilage ; Life and Medical Sciences
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The timing and molecular profile of cartilage destruction in Escherichia coli and Staphylococcus aureus infectious arthritis and killed Mycobacterium butyricum adjuvant arthritis are presented. Infectious arthritis was studied for 3 weeks; cartilage samples were analyzed at 2, 10, and 21 days. At 48 h postinfection, glycosaminoglycan content was reduced by 20% (p 〈 0.05) in E. coli infected knees and by 42% (p 〈 0.05) in tibial plateau cartilage of S. aureus infected knees. By the 3rd week of infection, glycosaminoglycan losses amounted to as much as 73% (p 〈 0.005). In comparison, collagen losses were not significant prior to the 3rd week of infection, at which time 42% (p 〈 0.05) was lost. Adjuvant arthritic tibial plateau cartilage was examined at 1, 3 and 12 weeks. Glycosaminoglycans decreased by 42% the 1st week, plateauing at 62% by the 3rd and 12th weeks. Collagen degradation began at 3 weeks (28% loss, p 〈 0.10) and by the 12th week was reduced by 49% (p 〈 0.005). Analysis of the individual species of glycosaminoglycan showed a parallel loss of chondroitin sulfate and keratan sulfate. Fractionation of glycosaminoglycans with respect to size produced no evidence of shortened chains in cartilage from infected joints. Hyaluronic acid losses were greatest when collagen was significantly decreased. The pattern by which chondroitin and keratan sulfates are lost demonstrates that a prominent feature of infectious and noninfectious inflammatory arthritis is a rapid loss of proteoglycan subunits that precedes collagen loss.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jor.1100010204
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Keratan sulfate content and articular cartilage maturation during postnatal rabbit growth (1984)
    Hoboken, NJ [u.a.] : Wiley-Blackwell
    Journal of Orthopaedic Research 2 (1984), S. 143-150 
    Details
    ISSN: 0736-0266
    Keywords: Keratan sulfate ; Cartilage maturation ; Glycosaminoglycan ; Proteoglycan ; Rabbit ; Life and Medical Sciences
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: This article describes the macromolecular changes in keratan sulfate and proteoglycan that occur in rabbit articular cartilage during postnatal development. Articular cartilage glycosaminoglycan from femoral condyles and the tibial plateaus of rabbits at 8, 12, 18, and 26 weeks and 2 years of age were extracted, fractionated, and quantified. The predominant glycosaminoglycan present in articular cartilage at 8 weeks was chondroitin sulfate. During subsequent maturation the relative proportions of keratan sulfate and chondroitin sulfate varied inversely. The greatest increase in the amount of keratan sulfate present in cartilage was observed between 12 and 26 weeks of age. Hyaluronic acid content was measurable at 12 weeks; afterward the amount remained relatively constant with age. Proteoglycans, extracted from 6-, 12-, and 22-week-old rabbit femoral and tibial cartilage in the presence of protease inhibitors, were analyzed on columns of Sepharose CL-2B. Cartilage proteoglycans decreased in hydrodynamic size between 12 and 22 weeks, corresponding to the period of maximal change in content of keratan and chondroitin sulfate.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jor.1100020205
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    Paper (German National Licenses)
    Fulltext
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