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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 58 (1994), S. 149-157 
    ISSN: 1432-0630
    Keywords: 61.10.Lx ; 61.72.−y ; 68.55.Ln
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract X-ray double-crystal topography is, together with section topography, the most deformation-sensitive method. Its advantages and problems are discussed especially in view of the widely spread Lang topography. There are advantages regarding sensitivity, exposure time and the simplicity of contrast evaluation. The disadvantage of its sensitivity to sample warping can be overcome to some extent by a special double-crystal technique with an adaptable bending of the collimator crystal compensating for a homogeneous sample curvature. In contrast to other techniques, double-crystal topography preserves its high-deformation sensitivity also in reflection geometry. That is advantageous if near-surface defects and deformations are investigated as shown by several examples.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Annals of biomedical engineering 17 (1989), S. 13-38 
    ISSN: 1573-9686
    Keywords: Oxygen transport ; Microcirculation ; Cerebral circulation ; Carbon monoxide ; Mathematical model ; Computer simulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract A compartmental model is formulated for oxygen transport in the cerebrovascular bed of the brain. The model considers the arteriolar, capillary and venular vessels. The vascular bed is represented as a series of compartments on the basis of blood vessel diameter. The formulation takes into account such parameters as hematocrit, vascular diameter, blood viscosity, blood flow, metabolic rate, the nonlinear oxygen dissociation curve, arterial PO2, P50 (oxygen tension at 50% hemoglobin saturation with O2) and carbon monoxide concentration. The countercurrent diffusional exchange between paired arterioles and venules is incorporated into the model. The model predicts significant longitudinal PO2 gradients in the precapillary vessels. However, gradients of hemoglobin saturation with oxygen remain fairly small. The longitudinal PO2 gradients in the postcapillary vessels are found to be very small. The effect of the following variables on tissue PO2 is studied: blood flow, PO2 in the arterial blood, hematocrit, P50, concentration of carbon monoxide, metabolic rate, arterial diameter, and the number of perfused capillaries. The qualitative features of PO2 distrbution in the vascular network are not altered with moderate variation of these parameters. Finally, the various types of hypoxia, namely hypoxic, anemic and carbon monoxide hypoxia, are discussed in light of the above sensitivity analysis.
    Type of Medium: Electronic Resource
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