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  • 11
    Electronic Resource
    Electronic Resource
    On the R-order of coupled sequences II (1982)
    Springer
    Computing 29 (1982), S. 73-81 
    Details
    ISSN: 1436-5057
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Die Bestimmung der R-Ordnung τ von Folgen {x n, i ∼, die über ein System (3) von Ungleichungen miteinander verkoppelt sind, wird wie in der vorangegangenen Arbeit [3] auf die nichtnegative Lösbarkeit des Systems (4) von linearen Ungleichungen zurückgeführt. Weiterhin wird gezeigt, daß die beste R-Ordnung τ, welche sich aus (3) herleiten läßt, gleich dem Spektralradius einer bestimmten Matrix ist, welche aus in (3) auftretenden Exponenten gebildet wird.
    Notes: Abstract As in the preceding paper [3], the question whether some of the sequences {x n, i } coupled by a system (3) of inequalities converge at least with a certain R-order τ is reduced to the nonnegative solvability of the system (4) of linear inequalities. Further, the optimal R-order τ implied by (3) is characterized as the spectral radius of a certain matrix composed of exponents appearing in (3).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02254852
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  • 12
    Electronic Resource
    Electronic Resource
    On the R-order of coupled sequences III (1983)
    Springer
    Computing 30 (1983), S. 157-169 
    Details
    ISSN: 1436-5057
    Keywords: 65H10 ; 15A48 ; Iterative parallel processes ; best individualR-orders ; ordered positive decomposition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Für konvergente Folgen {x n,1 },...,{x n,s }, welche über ein System (2) von Ungleichungen miteinander verkoppelt sind, werden die besten individuellenR-Ordnungen τ1,...,τ s bestimmt. Dazu wird gezeigt, daß diese gleich den Spektralradien von bestimmten Matrizen sind, welche aus Exponenten in (2) gebildet werden.
    Notes: Abstract For convergent sequences {x n,1 },...{x n,s } coupled by a system (2) of inequalities the optimal individualR-orders τ1,...,τ s are determined as the spectral radii of certain matrices composed of exponents appearing in (2).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02280786
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  • 13
    Electronic Resource
    Electronic Resource
    Enclosing methods in perturbed nonlinear operator equations (1984)
    Springer
    Computing 32 (1984), S. 1-11 
    Details
    ISSN: 1436-5057
    Keywords: 65 H ; 65 J ; Nonlinear equation ; monotonous enclosure ; perturbation ; Newton- ; Regula falsi- ; Jacobi-Newton-type methods
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Es werden nichtlineare Gleichungen betrachtet, die in gewissen Eingangsparametern störungsbehaftet sind. Durch eine Klasse monoton einschließender Verfahren werden Folgen von Intervallen konstruiert, die für jeden Wert der Störungsparameter mindestens eine Nullstelle der Aufgabe enthalten. Für endlich-dimensionale Räume werden u. a. Verfahrensrealisierungen vom Newton-, Regula falsi- und Jacobi-Newton-Typ angegeben.
    Notes: Abstract Nonlinear equations are considered, where some input parameters are subjected to errors. By a class of monotone enclosing methods sequences of intervals are constructed, containing for each value of the perturbation parameter at least one zero of the problem. In finite dimensional spaces concrete realizations are given, e. g. of Newton-, Regula falsi- and Jacobi-Newton-type.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02243015
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  • 14
    Electronic Resource
    Electronic Resource
    Determination of the cone radius for positive concave operators (1984)
    Springer
    Computing 33 (1984), S. 37-49 
    Details
    ISSN: 1436-5057
    Keywords: 65H10 ; 90C30 ; 15A48 ; Iterative processes ; bestR-orders ; cone radius of concave operators ; spectral radii ; partial ordering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Die Berechnung der bestenR-Ordnung von Folgen aus iterativen Näherungsverfahren führt auf die Ermittlung des hier eingeführten Kegelradius bestimmter konkaver Operatoren. Das Hauptergebnis der Arbeit ist die Darstellung des Kegelradius als Infimum der Spektralradien aller den konkaven Operator majorisierenden linearen Operatoren. Diese Charakterisierung ist von numerischem Intersse.
    Notes: Abstract The computation of bestR-orders of sequences produced by iterative methods leads to the determination of the cone radius of certain concave operators. The main result of the paper is the representation of the cone radius as the infimum of spectral radii of all linear operators majorizing the concave operator. This characterization is of numerical interest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02243074
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  • 15
    Electronic Resource
    Electronic Resource
    RNA-tumoriviruses, oncogenes, and their possible role in human carcinogenesis (1983)
    Springer
    Journal of molecular medicine 61 (1983), S. 1217-1231 
    Details
    ISSN: 1432-1440
    Keywords: RNA tumor viruses ; Human leukemia ; Viral carcinogenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The detection and characterization of oncogenes via RNA tumor viruses (or retroviruses) and the recognition of their location at breakpoints of chromosomal translocations which are frequently found in certain human neoplasms has promoted present understanding of molecular mechanisms underlying carcinogenesis. Oncogenes are cellular genes which can be transduced by RNA tumorviruses and induce malignant transformation under experimental conditions in vivo and in vitro. A role of retroviruses in human leukemogenesis is suggested by epidemiological observations and by the isolation of such viruses from several human T-cell leukemias and lymphomas (human T-cell leukemia/lymphoma virus or HTLV) as well as by biochemical association of retroviral markers with human leukemias. A role of HTLV has been suggested also in a human immune deficiency syndrome (AIDS). In view of the well known role of many factors in carcinogenesis the concept of carcinogenesis as a multistep process as well as the concept of cocarcinogenesis and the role of cofactors other than viruses, such as radiation and chemicals, aging, hormones, graft vs host reaction, environmental factors etc., will have to be carefully considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01540470
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  • 16
    Electronic Resource
    Electronic Resource
    Anatomische und röntgenologische Untersuchungen zur endoskopischen Punktion der großen Körperschlagadern (1955)
    Springer
    European archives of oto-rhino-laryngology and head & neck 168 (1955), S. 101-132 
    Details
    ISSN: 1434-4726
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung 1. Mit Hilfe der endoskopischen Punktion gelingt es auf einfache Weise und zuverlässig, die großen Körperschlagadern zu erreichen: durch den Oesophagus den distalen Aortenbogen und die absteigende Aorta, durch den proximalen Abschnitt der Hauptbronchien bzw. durch die Seitenwand der Trachea die Pulmonalarterien; der aufsteigende Anteil des Aortenbogens wird pertracheal punktiert. 2. An Hand anatomischer Präparate werden die typischen Einstichstellen gezeigt. 3. Auf Grund von Punktionsstudien an der Leiche wurden Trefferskizzen angefertigt, welche die günstigsten Positionen zur peroesophagealen und pertrachealen Punktion der Aorta und zur pertrachealen Punktion der Art. pulmonalis und ihrer beiden Hauptäste augenfällig machen. 4. Mit Hilfe der Röntgenuntersuchung läßt sich vor der Punktion bestimmen, an welcher Seite, in welcher Höhe und in welcher Richtung eingestochen werden sollte, um die Aorta, die Art. pulmonalis und den linken Vorhof sicher zu erreichen. 5. Die günstigsten Einstichstellen werden für alle wichtigen Punktionsarten angegeben und hierbei Alter, Geschlecht und Konstitution der Patienten berücksichtigt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02278865
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  • 17
    Electronic Resource
    Electronic Resource
    Ein Einschliessungsverfahren für Lösungen Fehlerbehafteter Linearer Gleichungen (1982)
    Springer
    Periodica mathematica Hungarica 13 (1982), S. 29-37 
    Details
    ISSN: 1588-2829
    Keywords: Primary 65F10 ; Secondary 47B55 ; Linear perturbed equations in partially ordered spaces ; monotonically enclosing methods ; computation of initial vectors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In a partially ordered space, the method xn+1 = L+x n + − N+x n - − L−y+ + N− y n - + r, yn+1 = N+y+ − L+y n - − N−x n + + L−x− + t of successive approximation is developed in order to enclose the solutions of a set of linear fixed point equations monotonously. The method works if only the inequalities x0 ≤ y0, x0 ≤ x1, y1 ≤ y0 related to the starting elements are satisfied. In finite-dimensional spaces suitable starting vectors can be computed if a sufficiently good approximation for the fixed points is known.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01848094
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  • 18
    Electronic Resource
    Electronic Resource
    Mandibular gland allomones ofDasymutilla occidentalis and other mutillid wasps (1980)
    Springer
    Journal of chemical ecology 6 (1980), S. 895-903 
    Details
    ISSN: 1573-1561
    Keywords: Dasymutilla occidentalis ; Dasymutilla ; Timulla ; Pseudomethoca ; Smicromyrme ; Traumatomutilla ; Pappognatha ; Hymenoptera ; Mutillidae ; 4-methyl-3-heptanone ; 4,6-dimethyl-3-nonanone ; 4,6-dimethyl-3-octanone ; allomones
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The mandibular gland secretion of the mutillid wasp,Dasymutilla occidentalis, possesses three short-chained ketones-4-methyl-3-heptanone (4MH), 4,6-dimethyl-3-nonanone (4,6DMN), 4,6-dimethyl-3-octanone (4,6DMO)—and several unidentified compounds. This is the first report of 4,6DMN as a natural product and its synthesis is described. These ketones, which are either known to be ant alarm pheromones or are structurally very similar to ant alarm pheromones, appear to function as allomones against ants, major potential predators of mutillid wasps. The major secretory component, 4-methyl-3-heptanone, which was identified in females and/ or males of the species analyzed within the generaDasymutilla, Timulla, Traumatomutilla, andPappognatha, appears to constitute a chemical character of the defensive secretions of these genera.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00990473
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  • 19
    Electronic Resource
    Electronic Resource
    Die Herzformen des Mannes und der Frau im Röntgenbild (1957)
    Springer
    Basic research in cardiology 25 (1957), S. 163-178 
    Details
    ISSN: 1435-1803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung Die Formgestalt des Herzschattens im Röntgenbild ist beim Manne anders als bei der Frau. Die Herzform des Mannes kann trotz mancher Abwandlungen auf einen bestimmten Grundtypus zurückgeführt werden. Das Frauenherz ist einförmiger gestaltet, und es ist in seiner Form dem jugendlichen Herzen ähnlich. Die Unterschiede zwischen den Geschlechtern treten nur in den mittleren Lebensjahren deutlich hervor. In der Jugend und im Alter aber zeigt die Formgestalt des Herzens bei Mann und Frau gemeinsame Züge. Die Formunterschiede lassen sich in bestimmten Abmessungen zum Ausdruck bringen: in der Länge des Gefäßbandes, der Breite des Gefäßbandes und der Höhe des Herzschattens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02119128
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  • 20
    Electronic Resource
    Electronic Resource
    Pressure influences on the viscosity of polymer solutions (1982)
    Springer
    Rheologica acta 21 (1982), S. 505-507 
    Details
    ISSN: 1435-1528
    Keywords: Polystyrene solution ; viscosity ; pressure influence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01534331
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