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  • Finite Volume  (1)
  • Microcirculation  (1)
  • Red blood cell velocity  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Analysis of the bidirectional optical three-stage prism grating system for red blood cell velocity measurements in microvessels (1984)
    Springer
    Medical & biological engineering & computing 22 (1984), S. 521-528 
    Details
    ISSN: 1741-0444
    Keywords: Microcirculation ; Red blood cell velocity ; Spatial filtering ; Three-stage prism grating
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract A bidirectional optical (BDO) three-stage prism grating system has been developed to measure online direction and magnitude of red blood cell (RBC) velocities in the microcirculation. The paper describes a mathematical evaluation of the BDO system. The optical grating configuration was simulated in terms of a spatial filter. The input signal was the simulated spatial light distribution of a group of moving RBCs Three methods for estimating the mean frequency (fmean) of the signal corresponding to RBC velocity were evaluated on the criteria of accuracy and noise sensitivity. All underestimated the RBC velocity. The reference method calculates fmean from the power density spectrum. A zero-crossing counting technique and a method based on time differentiation underestimated the mean frequency by 14·1±11·3 per cent (mean ±SD) and 0·9±0·1 per cent, respectively. The zero-crossing counting technique was more sensitive to noise than both other methods. The reference method, operating in the frequency domain, is preferred, because the power density spectrum obtained can be corrected for filtering errors induced by higher-order passbands of the optical filter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02443865
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    On the consistency of four different control surfaces used for finite area blade-to-blade flow calculations (1984)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 4 (1984), S. 1083-1095 
    Details
    ISSN: 0271-2091
    Keywords: Turbomachines ; Finite Volume ; Consistency ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The aim of this contribution is to investigate the consistency and order of accuracy of different control surfaces used for finite area blade-to-blade flow calculations. The following cases will be treated: a hexagonal element, a trapezoidal element, a bitrapezoidal element and a quadrilateral element. Finally, the consistency conditions will be discussed and compared with respect to a cascade flow application.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650041107
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    Paper (German National Licenses)
    Fulltext
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