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  • 1985-1989  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Wall pressure and its relation to turbulent structure of a boundary layer (1986)
    Springer
    Experiments in fluids 4 (1986), S. 49-55 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Wall pressure fluctuations were measured in relation to the structure of coherent motions of a turbulent boundary layer. Their high and low frequency parts were found to be related with the large scale motions of the outer layer and the bursts in the wall region respectively. Based on the experimental results, a structure model of the coherent motions is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00316786
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    LCBF values decline while Lλ values increase during normal human aging measured by stable xenon-enhanced computed tomography (1988)
    Springer
    Neuroradiology 30 (1988), S. 463-472 
    Details
    ISSN: 1432-1920
    Keywords: Cerebral blood flow ; Partition coefficient ; Computed tomography ; Stable xenon ; Aging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Results of measurements of LCBF and Lλ values utilizing optimal CT-CBF methods under resting conditions are reported among thirty-two neurologically normal volunteers aged between 20 and 88 years. Measurements were made during inhalation of 26–30% stable xenon gas for 8 min and serial scanning utilizing a state-of the-art CT scanner with both eyes closed and ears unplugged. LCBF values for cortical gray matter were lowest in occipital cortex and highest in frontal cortex. Gray matter flow values were also high in subcortical structures with highest values measured in the thalamus. For white matter, highest flow values were measured in the internal capsule. Changes in LCBF and Lλ values were analyzed with respect to advancing age. Significant age-related declines in LCBF values were observed in occipital cortex and frontal white matter. Significant age-related increases in Lλ values were measured in frontal and temporal cortex, caudate nucleus and thalamus. Possible explanations are offered for these age-related increases in Lλ values for gray matter, such as accumulation of lipofuscin in neurons and relative compacting of gray matter with advancing age. The latter increases the numbers of nerve cells sampled per volume of gray matter measured.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00339684
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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