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  • 1
    Electronic Resource
    Electronic Resource
    Urine saturation with calcium salts in normal subjects and idiopathic calcium stone-formers estimated by an improved computer model system (1985)
    Springer
    Urological research 13 (1985), S. 189-193 
    Details
    ISSN: 1434-0879
    Keywords: Calcium stone disease ; Calcium oxalate ; Brushite ; Urine saturation ; Stability constants ; Soluble complexes ; Computer system
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The state of saturation of urine with calcium salts has been estimated by means of a computer model system whose accuracy has been improved by the use of stability constants of 31 complexes which were re-determined at 37°C and at the actual ionic strength of urine. The experimental determination of the concentration solubility products of calcium oxalate monohydrate (CaOx) and of calcium hydrogen phosphate dihydrate (bsh) allows an expression of the saturation degree as free concentration product ratio βCaOx and βbsh. Morning urine samples from 50 healthy controls and 50 idiopathic calcium stone-formers and 24 h urines from 40 normal subjects and 192 stoneformers, taking normal diet were investigated by this technique. From our results urine supersaturation with calcium oxalate salts seems to play an important role in calcium stone disease. Hypercalciuria and hyperoxaluria seem to be the main pathological features in this regard. The data concerning βbsh values have not confirmed previous reports in which this parameter was found to be increased in stone-formers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00261822
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Time-Dependent Traffic Equilibria (1999)
    Springer
    Journal of optimization theory and applications 103 (1999), S. 543-555 
    Details
    ISSN: 1573-2878
    Keywords: Transportation networks ; equilibrium solutions ; Wardrop condition ; time-dependent requirements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We consider the existence, characterization, and calculation of equilibria in transportation networks, when the route capacities and demand requirements depend on time. The problem is situated in a Banach space setting and formulated in terms of a variational inequality.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021779823196
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    Paper (German National Licenses)
    Fulltext
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