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  • 1
    Electronic Resource
    Electronic Resource
    The control of turbulent end-wall boundary layers using surface suction (1999)
    Springer
    Experiments in fluids 27 (1999), S. 484-496 
    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 An experimental evaluation of the effects of spatially-limited (i.e. localized) surface suction on a turbulent junction flow was performed using Particle Image Velocimetry (PIV). The results indicate that surface suction can (1) weaken both the instantaneous turbulent vortex and its associated surface interactions in the symmetry plane, (2) effectively eliminate the presence of the average turbulent necklace vortex in the symmetry plane, and (3) weaken the average downstream extensions of the vortex. It was also established that suction effectively reduces the low frequency component of the Reynolds-stress in both the symmetry plane and trailing-edge cross-stream planes, and stabilizes the behavior of the trailing vortex legs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003480050373
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Megafauna Can Control the Quality of Organic Matter in Marine Sediments (1999)
    Springer
    Naturwissenschaften 86 (1999), S. 320-324 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Notes: Abstract  On the highly productive Oman Margin of the Arabian Sea, where an intense permanent oxygen minimum impinges on the continental slope, there is no relationship between oxygen concentration and sedimentary organic-carbon content. However, we provide photographic and molecular evidence that benthic invertebrates play a significant role in the redistribution of organic matter. High densities of spider crabs and brittle stars characterize a narrow band near the base of the oxygen minimum zone, where sediments have depleted organic carbon contents and a remarkable lipid composition that is indicative of metabolic alteration of phytoplankton-derived sterols by invertebrate detritivores. The distributions of sedimentary sterols and the high abundances of epifaunal crabs and brittle stars suggest that the metabolism of the megabenthos profoundly influences the quality of organic matter in underlying sediments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001140050624
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Axonal injury and the neuropathology of shaken baby syndrome (1998)
    Springer
    Acta neuropathologica 95 (1998), S. 625-631 
    Details
    ISSN: 1432-0533
    Keywords: Key words Shaken baby syndrome ; Shaken infant ; Axonal injury ; β-Amyloid precursor protein
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We examined an autopsy series of 14 children with shaken baby syndrome (SBS) who lacked skull fracture. Evidence of axonal injury was sought using immunohistochemical stains for neurofilament, 68-kDa neurofilament and β-amyloid precursor protein (βAPP). βAPP-positive axons were present in the cerebral white matter of all cases of SBS but were also present in 6 of 7 children dying of non-traumatic hypoxic ischemic encephalopathy (HIE). Swollen axons were present in 11 of 14 cases of SBS and in 6 of 7 cases of HIE. βAPP-positive axons were present in both groups in the midbrain and medulla. The cervical spinal cord in SBS contained βAPP-positive axons in 7 of 11 cases; 5 of 7 contained swollen axons within the white matter tracts; in 2 immunoreactivity was localized to spinal nerve roots; in all 7 there was a predilection for staining at the glial head of the nerve root. Among cases of HIE, none showed abnormal axons or βAPP-positive reactivity in the cervical cord white matter. We conclude that cerebral axonal injury is common in SBS, and may be due in part to hypoxic/ischemic injury. Cervical cord injury is also common, and cannot be attributed to HIE. These findings corroborate suggestions that flexion-extension injury about the cervical spinal column may be important in the pathogenesis of SBS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004010050849
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Blood flow capacity via direct acute myocardial revascularization (1997)
    Springer
    Basic research in cardiology 92 (1997), S. 45-51 
    Details
    ISSN: 1435-1803
    Keywords: Dog ; Vineberg procedure ; coronary artery disease ; coronary bypass surgery ; myocardial ischemia ; transmyocardial laser revascularization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The concept of direct myocardial revascularization, achieving myocardial perfusion through means other than the normal coronary vasculature, has a long history with the most widely investigated technique being the Vineberg procedure; current interest centers around the encouraging preliminary clinical results obtained with transmyocardial laser revascularization. Despite significant previous research, the acute blood flow potential through the direct myocardial route remains unknown. Nontransmural laser channels were made in the distal LAD territory from the epicardial surface of 5 mongrel dogs to which an internal mammary artery was connected. A flow probe was placed on the distal most portion of the artery and an intercostal branch was cannulated for infusion of colored microspheres. Measurements were taken under baselin conditions and following LAD and epicardial collateral ligation. Under all conditions, blood flow pattern was of a to-and-fronature. At baseline, there was an average 0.60±0.24 ml/min net flow into the myocardium which was all contained within 0.5 cm of the central channel with a final myocardial perfusion of 0.011±0.016 ml/min/g. Following induction of ischemia average flow increased to 1.41±0.51 ml/min which extended as far as 1 cm from the channel with a final myocardial perfusion of 0.22±0.19 ml/min/g. In conclusion, a limited amount of acute myocardial perfusion can be achieved by the present technique of direct myocardial revascularization and the amount of flow is highly dependent upon the amount of flow through the native circulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00803756
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    Paper (German National Licenses)
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