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  • 1
    Electronic Resource
    Electronic Resource
    Computational limit analysis of rigid-plastic bodies in plane strain (1993)
    Springer
    Acta mechanica solida Sinica 6 (1993), S. 341-348 
    Details
    ISSN: 0894-9166
    Keywords: limit analysis ; mathematical programming ; finite element method
    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 computational methods for limit analysis of plane strain problems. The finite element mathematical programming formula (FE-MPF) for determining the upper bound load multiplier established by the authors earlier is adopted and modified for plane strain problems. The penalty method is used to impose the incompressibility constraint. The FE-MPF is solved by a direct iteration procedure without the need of a searching process. This algorithm is not sensitive to the volumetric locking effect. And it can be easily extended to the limit analysis of three dimensional problems. The results of numerical examples are satisfactory and show the stable convergency of the present algorithm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02208020
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A model of sterile vesicoureteric reflux in the sheep (1998)
    Springer
    Pediatric nephrology 12 (1998), S. 190-196 
    Details
    ISSN: 1432-198X
    Keywords: Key words: Vesicoureteric reflux ; Sheep ; Distal kidney tubules ; Cystometry ; Cystourethrogram
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Eighteen Coopworth ewe lambs were divided into three groups based on the initial cystourethrogram and cystometry findings at 5 – 7 weeks of age: group 1, 6 lambs with spontaneous low-pressure bilateral vesicoureteric reflux (VUR) on bladder filling were used to study the natural history of reflux; group 2, 5 lambs with no VUR detected were used to establish an experimental model of bilateral VUR using an unroofing surgical procedure; group 3, 7 lambs with spontaneous VUR detected during micturition had the same surgical procedure to increase the degree of VUR. All three animal groups were followed for 4 – 10 months. Spontaneous VUR was demonstrated in 13 of 18 lambs (25/36 ureters). The presence and severity of spontaneously occurring reflux in group 1 lambs diminished with increasing age. VUR was created successfully in group 2 and increased in degree in group 3 animals. The only significant histological finding in all three animal groups with grades II and III VUR was distal renal tubular dilatation. The sheep is a useful and readily available animal for studying VUR. During 4 – 10 months of follow-up, sterile reflux without bladder outflow obstruction resulted in distal renal tubular dilatation, but no renal parenchymal damage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004670050435
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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