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  • Cerebral blood flow  (1)
  • Polymer and Materials Science  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 27 (1996), S. 246-251 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Hard Particle Dissolution and Structure of Coarsegrained Dispersion Layers on Steel Produced by Convection-reduced Laser MeltingWith the aim to produce hard and wear-resistant dispersion layers coarse grained TiC-and TiB2-particles were incorporated into the surface layers of steels by means of a two-step laser melting process with reduced melt bath convection. The influence of the carbon conent of the steel and content of alloying elements and hard particles in the screen printed layer on solidification structures and particle dissolution was investigated by optical and electron microscopy and x-ray microanalysis. The produced layers were also characterized by hardness measurements.
    Notes: Mit dem Ziel, harte und verschleißfeste Dispersionsschichten zu erzeugen, wurden in die Oberfläche von Stahlproben grobkörnige TiC- und TiB2-Partikel nach einem zweistufigen Prozeß mit Hilfe eines CO2-Leistungslasers eingeschmolzen. Die Laserbehandlung erfolgte derart, daß eine Schmelzbadkonvektion weitgehend unterdrückt werden konnte. Der Einfluß des Kohlenstoffgehaltes im Stahl sowie der Art und der Gehaltes von metallischen Zusätzen und Hartstoffen in der Vorbeschichtung auf die Hartstoffauflösung und die Ausbildung der Schichtgefüge wurde mittels Lichtmikroskopie, Rasterelektronenmikroskopie und Röngenmikroanalyse untersucht. Außerdem wurden zur Schichtcharakterisierung Härtemessungen durchgeführt.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Medical & biological engineering & computing 18 (1980), S. 39-47 
    ISSN: 1741-0444
    Keywords: Cerebral blood flow ; Isotope clearance ; Noninvasive technique
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract The validity of atraumatic measurements of regional cerebral blood flow (r.c.b.f) by intravenous injection of Xenon 133 has been studied in 17 patients with cerebrovascular diseases. The results were directly compared with those obtained in the same subjects using the intracarotid-injection method. Clearance curves obtained by the intravenous method were analysed by means of a bicompartmental model of blood circulation corrected for recirculation of the tracer. Use of different modes of intravenous injection and systematic analysis of the portion of the clearance curve usable for estimation of regional cerebral blood flow enabled the authors to define the optimal conditions for measurement of r.c.b.f. in subjects with cerebrovascular disorders. A predominant source of error was found to be the difficulty in defining the exact instant when clearance begins. As a result, the best conditions were as follows: slow injection (1 min) of tracer and analysis of the portion of clearance curve between 3 and 11 min after the beginning of the clearance. Under these conditions this atraumatic method is as precise in subjects with cerebrovascular disease as in those with normal cerebral circulation.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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