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  • 1
    Electronic Resource
    Electronic Resource
    Antagonistic effects upon cutaneous circulation of muscular exercise and exposure to a high ambient temperature (1975)
    Springer
    Pflügers Archiv 359 (1975), S. 137-146 
    Details
    ISSN: 1432-2013
    Keywords: Skin Blood Flow ; Plethysmography ; Exercise ; Heat Stress ; Hand Blood Flow ; Peripheral Circulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Measurements were made in man of heart rate (Fc), arterial blood pressure (Pa), cutaneous blood flow ( $$\dot Q$$ ) (by plethysmography of the hand) as well as variation sin venous volume (ΔV) in the course of muscular exercise of 70 Watts intensity corresponding from 48% to 60% of the maximal oxygen consumtion of the subjects. These exercises were carried out at ambient temperatures of 22° and 29° C. for 8 min. In every case, an initial lowering of the $$\dot Q$$ and ΔV followed by a progressive climb was found. The average maximal reduction in output was virtually identical at 22° and 29° C (4.10±2.05 and 4.00±2.31 ml/min. 100 cm3). But the average maximal fall in volume turned out to be less at 29° C (0.30±0.40 ml/100 cm3) than at 22° C (0.60±0.60 ml/100 cm3). The resistive sector of cutaneous circulation conserves the same vasomotor capacities at the two ambient temperatures studied: the cutaneous capacitive sector shows lower reactivity at the higher ambient temperature. This would suggest that diminished venous return may be partially responsible for poor tolerance to exercise in warm climates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00581283
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  • 2
    Electronic Resource
    Electronic Resource
    The Schur algorithm and its applications (1985)
    Springer
    Acta applicandae mathematicae 3 (1985), S. 255-284 
    Details
    ISSN: 1572-9036
    Keywords: 35P25 ; 47B35 ; 65M25 ; 86.34 ; 93E10 ; Inverse scattering ; two-component wave equations ; scattering matrix ; fast Cholesky recursions ; Schur algorithm ; inverse seismic problem ; linear estimation ; ladder filters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract The Schur algorithm and its time-domain counterpart, the fast Cholseky recursions, are some efficient signal processing algorithms which are well adapted to the study of inverse scattering problems. These algorithms use a layer stripping approach to reconstruct a lossless scattering medium described by symmetric two-component wave equations which model the interaction of right and left propagating waves. In this paper, the Schur and fast Chokesky recursions are presented and are used to study several inverse problems such as the reconstruction of nonuniform lossless transmission lines, the inverse problem for a layered acoustic medium, and the linear least-squares estimation of stationary stochastic processes. The inverse scattering problem for asymmetric two-component wave equations corresponding to lossy media is also examined and solved by using two coupled sets of Schur recursions. This procedure is then applied to the inverse problem for lossy transmission lines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00047331
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    Paper (German National Licenses)
    Fulltext
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