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  • 1
    ISSN: 1432-1270
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Applied composite materials 3 (1996), S. 311-320 
    ISSN: 1573-4897
    Keywords: inextensible fibres ; multilayered plates ; wave propagation ; propagator matrix ; composites
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In this article the propagator matrix method is employed to obtain the overall transfer matrix which gives dependence of displacements and stresses on the one face of the multilayered plate in terms of those on the opposite face. Attention is restricted to waves propagating in the plane parallel to stress free plate faces where we examine waves travelling at any angle to one of the families of fibres. The plate is of finite thickness but of infinite lateral extent. Each of the laminae is formed from same material reinforced by one family of inextensible fibres laying in the plane of the laminae. Results are presented for eight-ply laminated plate with symmetric arrangements of the laminae. Frequency spectrum for first 10 modes is presented for specific plate with (π/2, −π/4, π/4, 0)s lay up, and specific fibre reinforced material.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Mathematical methods of operations research 25 (1981), S. 119-131 
    ISSN: 1432-5217
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Zusammenfassung Ein kooperativesn-Personen-Spiel wird durch eine endliche MengeN (die Spielermenge) und eine nicht additive Mengenfunktionv, definiert auf der Potenzmenge vonN (d.h. auf den Koalitionen), charakterisiert. Auf Schmeidler geht der Begriff des Nukleolus als eines für ein kooperatives Spiel geeigneten Lösungskonzeptes zurück. Bruyneel und Kopelowitz haben jeweils Algorithmen zur Berechnung des Nukleolus eines vorgegebenen kooperativen Spieles angegeben. Das vorliegende Papier gibt einen weiteren Algorithmus an. Dieser ist — ähnlich wie der von Bruyneel entwickelte — begrifflich gestützt auf das Konzept der minimal balancierten Koalitionssysteme (eingeführt von Shapley). In seiner direkten Form benötigt der Algorithmus die Liste aller zu minimal balancierten Mengensystemen gehörenden Gewichtsvektoren, jedoch wird in Abschnitt 2 eine Methode angegeben, diese Liste mit Hilfe einer Folge linearer Programme zu vermeiden. Es stellt sich heraus, daß der vorgelegte Algorithmus in gewisser Weise dual zu dem von Kopelowitz entwickelten ist. Ein Vergleich aller drei nunmehr vorliegenden Algorithmen findet sich in Abschnitt 2.
    Notes: Abstract The nucleolus is a central concept of solution in the theory of cooperativen person games with side payments; it has been introduced and studied by Schmeidler [1969] and several methods for finding the nucleolus have been proposed byKopelowitz [1967],Bruyneel [1979],Stearns [1968] andJustman [1977], respectively. The aim of the present paper is that of giving a new algorithm for finding the nucleolus and to discuss the relationship of this algorithm with those given by Kopelowitz and Bruyneel. The algorithm is based upon the concept of minimal balanced set of a finite set; this last concept has been introduced for other purposes byShapley [1967]. The relationship between the nucleolus and the balanced sets has been studied byKohlberg [1971], where it has been shown that the so-called coalition array of an imputation is the coalition array of the nucleolus iff some parts of it are balanced sets. Our algorithm computes such a coalition array by finding a sequence of minimal balanced sets. Any element of the sequence can be found be solving a LP problem, then the nucleolus is easily found from the coalition array. The algorithm is in some sense a dual of the Kopelowitz‘ algorithm. It clarifies completely the relationship between the nucleolus and the minimal balanced sets, that allowed the statement of the Bruyneel's algorithm; moreover, our algorithm doesn't assume the knowledge of the list of weight vectors associated to the set of minimal balanced sets, but constructs only the part of the list needed for finding the nucleolus.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Mathematical methods of operations research 29 (1985), S. 248-248 
    ISSN: 1432-5217
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Type of Medium: Electronic Resource
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  • 5
    Publication Date: 1981-08-01
    Print ISSN: 1432-2994
    Electronic ISSN: 1432-5217
    Topics: Mathematics , Economics
    Published by Springer
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  • 6
    Publication Date: 1985-12-01
    Print ISSN: 1432-2994
    Electronic ISSN: 1432-5217
    Topics: Mathematics , Economics
    Published by Springer
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  • 7
    Publication Date: 2019-03-28
    Description: We present a design of a high-gain quad array of nonuniform helical antennas. The design is obtained by optimization of a 3-D numerical model of four nonuniform helical antennas placed above a ground plane, including a model of a feeding network, utilizing the method of moments with higher-order basis functions. The gain of one optimal nonuniform helical antenna can be about 2.5 dB higher than the gain of a uniform helical antenna of the same axial length. Creating a 2×2 array further increases the gain up to about 6 dB. The resulting quad array fits into a box whose dimensions are 2.5×3.3×3.3 wavelengths, and the gain in the main radiating direction is about 20.5 dBi in the frequency range from 0.9 GHz to 1.1 GHz. The design is verified by measurements of a prototype of the quad array.
    Print ISSN: 1687-5869
    Electronic ISSN: 1687-5877
    Topics: Electrical Engineering, Measurement and Control Technology
    Published by Hindawi
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