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  • 1
    Electronic Resource
    Electronic Resource
    Adaptive procedure for estimating parameters for the nonsymmetric Tchebychev iteration (1978)
    Springer
    Numerische Mathematik 31 (1978), S. 183-208 
    Details
    ISSN: 0945-3245
    Keywords: AMS(MOS): 65F10 ; CR: 5.14
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary An iteration based upon the Tchebychev polynomials in the complex plane can be used to solve large sparse nonsymmetric linear systems whose eigenvalues lie in the right half plane. The iteration depends upon two parameters which can be chosen from knowledge of the convex hull of the spectrum of the linear operator. This paper deals with a procedure based upon the power method for dynamically estimating the convex hull of the spectrum. The stability of the procedure is discussed in terms of the field of values of the operator. Results show the adaptive procedure to be an effective method of determining parameters. The Tchebychev iteration compares favorably with several competing iterative methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01397475
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The Tchebychev iteration for nonsymmetric linear systems (1977)
    Springer
    Numerische Mathematik 28 (1977), S. 307-327 
    Details
    ISSN: 0945-3245
    Keywords: AMS (Mos): 65 F 10 ; CR: 5.14
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary In this paper an iterative method for solving nonsymmetric linear systems based on the Tchebychev polynomials in the complex plane is discussed. The iteration is shown to converge whenever the eigenvalues of the linear system lie in the open right half complex plane. An algorithm is developed for finding optimal iteration parameters as a function of the convex hull of the spectrum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01389971
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Use of tolazoline enhanced superior mesenteric arteriography to improve opacification of a cecal vascular ectasia: A case report (1979)
    Springer
    Abdominal imaging 4 (1979), S. 339-341 
    Details
    ISSN: 1432-0509
    Keywords: Angiography ; Vasodilators ; Cecal vascular ectasia ; Angiodysplasia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The use of vasodilators to enhance venous opacification during superior mesenteric arteriography is well established. This is a report on the use of intra-arterial tolazoline hydrochloride during angiography to improve opacification of a cecal vascular ectasia which was poorly demonstrated on an arteriogram performed without tolazoline.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01887552
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Probit analysis of the atrioventricular (AV) junctional tissues of the ferret heart (1979)
    Springer
    Cell & tissue research 199 (1979), S. 225-234 
    Details
    ISSN: 1432-0878
    Keywords: AV Node ; AV Bundle ; P cells ; Atrioventricular conduction ; Atrial muscle cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Probit frequency analysis, a graphic method for determining whether a population is normally distributed, skewed, or multinodal, was used to determine whether P cells are present in different regions of the AV junction in the ferret heart. This analysis indicated that at least 95% of the cells of the transitional zone, superficial AV node, deep AV node, and distal AV bundle of the ferret heart are morphologically homogeneous. In the proximal AV bundle a large cell population is found in addition to the AV bundle cells. The probit analysis was also used to characterize the shape of the cells of each region of the AV junction further. AV nodal cells are not as elongated as the atrial muscle cells and AV bundle cells. These nodal cells also do not branch as extensively as the AV bundle cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236134
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    Paper (German National Licenses)
    Fulltext
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