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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 256 (1978), S. 718-718 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Mathematical programming 15 (1978), S. 228-231 
    ISSN: 1436-4646
    Keywords: Traveling-Salesman Problem ; 1-tree ; Matroid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract In this note we propose to find a degree-constrained minimum 1-tree in the Held—Karp algorithm [5, 6] for the symmetric traveling-salesman problem, and show that it is reduced to finding a minimum common basis of two matroids.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 255 (1977), S. 620-620 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Archive of applied mechanics 45 (1976), S. 161-170 
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Übersicht Es wird der induzierte Widerstand eines Tragflügels mit optimaler Auftriebsverteilung untersucht. Der Tragflügel Hegt diametral in einem geschlossenen Windkanal mit Kreisquerschnitt. Aus einer Betrachtung des Strömungsfeldes in der Trefftz-Ebene werden exakte Ausdrücke für die Auftriebs- und Widerstandsverteilung abgeleitet. Wenn das Verhältnis b/d von Flügelspannweite zum Kanaldurchmesser vergrößert wird, dann ändert sich die Auftriebsverteilung allmählich von einer elliptischen zu einer gleichförmigen, und der induzierte Widerstand nimmt bis auf Null ab. Eine alternativ gewonnene Lösung mit Hilfe von gemischten asymptotischen Reihenentwicklungen bestätigt die Richtigkeit der Theorie. Bei den Untersuchungen wird die Strömung als reibungsfrei und inkompressibel vorausgesetzt, jedoch werden Zähigkeitseffekte kurz beschrieben.
    Notes: Summary The Induced drag of a wing with optimum lift distributions is studied, which lies on a diameter of a closed wind tunnel of circular cross section. Exact expressions of the spanwise lift distribution and the induced drag are obtained from the Trefftz plane flow field. When the ratio b/d of wing span to tunnel diameter increases, the lift distribution changes gradually from elliptic to uniform ones, and the induced drag also gradually decreases until it becomes zero. An alternative solution based on the method of matched asymptotic expansions confirms the exact theory to be valid. Throughout this paper the flow is assumed inviscid and incompressible, whereas the viscous effect are briefly descirbed.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of optimization theory and applications 22 (1977), S. 41-49 
    ISSN: 1573-2878
    Keywords: Controllability ; nonlinear systems ; sufficiency theorems ; control theory ; comparison theorems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Some sufficient conditions are presented for the controllability of general nonlinear systems. First, the controllability problem is transformed into the problem of existence of fixed points for some operator; using Schauder's theorem, it is derived that a sufficient condition for controllability is the existence of a subsetS inC n+m (T) which is invariant for a derived operator. Secondly, with the aid of the notion of comparison principle, the existence of the subsetS is guaranteed by the existence of solutions for some nonlinear integral inequality or equality equations. For example, one solution for such nonlinear integral equations is obtained under the assumption of the uniform boundedness for a nonlinear term of the differential equation.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Medical & biological engineering & computing 17 (1979), S. 135-137 
    ISSN: 1741-0444
    Keywords: Impedance measurement ; Skin impedance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Medical & biological engineering & computing 16 (1978), S. 592-594 
    ISSN: 1741-0444
    Keywords: Dispersion of skin impedance ; Skin impedance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Medical & biological engineering & computing 16 (1978), S. 623-632 
    ISSN: 1741-0444
    Keywords: Performance evaluation of drugs and cosmetics ; Skin impedance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Description / Table of Contents: Sommaire De nombreuses études ont déjà été effectuées sur les applications de la mesure de l'impédance aux variations de paramètres biologiques. La base de ces mesures est la différence due au facteur objectif entre l'impédance de référence (qui ne contient pas de facteur objectif) et l'impédance qui le contient. Dans le passé, les efforts ont surtout porté sur la relation entre le changement d'impédance de la peau et les facteurs objectifs tels que des maladies, et seules quelques études ont porté sur ce principe de mesure pour établir une impédance de référence en vue d'une méthode d'analyse de données. L'article propose: (a) une méthode pour la détermination d'un niveau de référence basée sur la transformation d'identité de l'impédance de la peau, (b) une théorie de transformation linéaire pour l'analyse des données et (c) le triangle exprimant le taux de changement des résultats obtenus, et il établit un principe de base des mesures. L'évaluation de performances de cosmétiques a été effectuée pour donner un exemple d'application du principe.
    Abstract: Zusammenfassung In den letzten Jahren wurden zahlreiche Untersuchungen der Anwendung von Hauptimpedanz auf biologische Messungen durchgeführt. Die Basis für dieses Veifahren ist, daß zwischen einer Referenzimpedanz und der Impedanz ein Unterschied entsteht. In der Vergangenheit wurde die Wichigkeit der Relation zwischen einer Veränderung in der Hautimpedanz und den objektiven Faktoren, wie Z.B. Krankheiten, betont, und es gibt nur wenige Studien über das Meßprinzip, die Bestimmung der Referenzimpedanz und Datenauswertungsmethode. (a) Eine Methode zur Festlegung eines auf der Identitätstransformation der Hautimpedanz basierenden Referenzniveaus, (b) lineare Transformationstheorie zur Datenanalyse und (c) ein Grundprinzip zum Messen wurden erarbeitet. Als Anwendungsbeispiel dieses Prinzips wurde eine Leistungsbewertung für Kosmetika durchgeführt.
    Notes: Abstract Numerous studies have been carried out on the application of skin impedance to biological measurement. Measurement is possible because a difference will result due to the objective factor of the impedance, and the reference impedance (which does contain the objective factor). Emphasis has been placed, in the past, on the relationship between the change in skin impedance and objective factors such as disease, and there are only a few studies on the principle of measurement as the establishment of a reference impedance and a data-analysis method. (a) A method for setting a reference level based on identity transformation of skin impedance, (b) linear-transformation theory for data analysis, and (c) rate of change triangle expression of the results obtained, are proposed, and a basic principle of measurement has been established. Performance evaluation of cosmetics was carried out as an example of the application of this principle.
    Type of Medium: Electronic Resource
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