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  • Dynamic cerebral CT scanning  (1)
  • non-Newtonian liquid  (1)
  • principal stretches  (1)
  • 1
    Electronic Resource
    Electronic Resource
    A constitutive equation for a non-Newtonian liquid (1992)
    Springer
    Rheologica acta 31 (1992), S. 3-13 
    Details
    ISSN: 1435-1528
    Keywords: Liquid ; non-Newtonian liquid ; constitutive equation ; principal stretches
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract The K-BKZ constitutive equation for non-Newtonian liquids usually uses as invariants the coefficients of the characteristic equation of a certain finite strain tensor. We show that the use of the roots of this equation, the squares of the principal stretches, is more efficient. We use a product of the linear relaxation spectrum and a simple sum of powers of the principal stretches as the “energy function” in the K-BKZ theory. The predictions of this theory agree with Meissner's data to a good approximation over many decades.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396462
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Dynamic CT brain scanning in the haemodynamic evaluation of cerebral arterial occlusive disease (1987)
    Springer
    Neuroradiology 29 (1987), S. 259-265 
    Details
    ISSN: 1432-1920
    Keywords: Dynamic cerebral CT scanning ; Arterial occlusive lesions ; Haemodynamic effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Dynamic cerebral CT scanning (DCT) was used to quantitatively analyse the haemodynamic effects of extracranial and intracranial arterial occlusive lesions in 17 patients with TIA's or minor cerebral infarcts. Using DCT and gamma variate curve fitting, mean transit times were determined for the terminal internal carotid arteries, middle cerebral arteries and middle cerebral-supplied Sylvian cortex at the level of the Circle of Willis. Six patients were studied sequentially, four before and after transcranial bypass surgery. No arterial or tissue delays were found in patients without haemodynamic arterial lesions or cortical infarcts. Seven of nine patients with haemodynamic, extracranial carotid lesions showed ipsilateral delays in arterial or tissue transit times. Tissue delays usually correlated with CT or clinical evidence of infarction. Improved haemodynamics in patients re-studied correlated with the effects of surgery or clinical recovery. DCT has several important limitations but has the potential to provide additional haemodynamic information about the cerebral circulation in selected patients with cerebral arterial occlusive disease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00451764
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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