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  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 131 (1933), S. 330-330 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] WE were keeping some snails (Helix pomatia} without food, under a bell-jar with a wide tubulure at the top ; in the tubulure was a cork bearing a thermometer. We found that the snails ate the cork, so, to protect it, we covered it with a thick layer of red Harbutt's plasticine. To our surprise, ...
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Computational mechanics 22 (1998), S. 26-31 
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper is concerned with outlining some fundamental solutions and Green's functions for a system of second order linear elliptic partial differential equations in two independent variables. The fundamental solution and a number of Green's functions are given in relatively elementary closed form for some cases when the coefficients in the equations are constant. When the coefficients are variable the fundamental solution is obtained for some particular classes of equations.
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  • 3
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of optimization theory and applications 44 (1984), S. 509-526 
    ISSN: 1573-2878
    Keywords: Control parameterization ; piecewise constant functions ; linear time-lag systems ; linear terminal constraints ; computational schemes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A computational scheme using the technique of control parameterization is developed for solving a class of optimal control problems involving linear hereditary systems with bounded control region and linear terminal constraints. Several examples have been solved to illustrate the efficiency of the technique.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of optimization theory and applications 46 (1985), S. 295-317 
    ISSN: 1573-2878
    Keywords: Nonlinear time-lag systems ; linear control constraints ; nonlinear terminal inequality constraints ; conditional gradient methods ; feasible direction methods ; control parametrization ; initial feasible control ; computational schemes ; finite convergence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A computational algorithm for a class of time-lag optimal control problems involving control and terminal inequality constraints is presented. The convergence properties of the algorithm is also investigated. To test the algorithm, an example is solved.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of optimization theory and applications 47 (1985), S. 91-107 
    ISSN: 1573-2878
    Keywords: Control parameterization ; piecewise constant functions ; nonlinear hereditary systems ; linear control constraints ; computational schemes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In this paper, a computational scheme using the technique of control parameterization is developed for solving a class of optimal control problems involving nonlinear hereditary systems with linear control constraints. Several examples have been solved to test the efficiency of the technique.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of elasticity 6 (1976), S. 137-147 
    ISSN: 1573-2681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Einige Grundgleichungen, die Clements neulich abgeleitet hat, dienen als Grundlage, um zwei Kontaktprobleme in der anisotropischen Thermoelastizität zu betrachten. Im ersten Problem geht es darum, die Wärmespannung in einem anisotropischen Halbraum zu bestimmen, die von einer erhitzten Last über einem Teil der Grenzlinie hervorgebracht wird. Im zweiten Problem geht es darum, einen Halbraum durch eine erhitzte starre Punze auszuzacken. Insbesondere wird das Auszacken durch eine kreisartize Punze betrachtet, und es ergeben sich numerische Angaben.
    Notes: Abstract Some basic equations recently derived by Clements are used to consider two contact problems in anisotropic thermoelasticity. The first problem concerns the determination of the thermal stress in an anisotropic half-space due to a heated load over a section of the boundary. The second problem concerns the indentation of a half-space by a heated rigid punch. In particular, indentation by a cylindrical punch is considered and some numerical results obtained.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of elasticity 6 (1976), S. 327-329 
    ISSN: 1573-2681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The system of equations governing antiplane deformations of inhomogeneous elastic media is examined with a view to achieving its reduction to a canonical form associated with the Cauchy-Riemann system.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of elasticity 7 (1977), S. 171-184 
    ISSN: 1573-2681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Es werden die zeitlich vorübergehenden Verrückungen und Spannungsänderungen in dicken inhomgenen zylinder-und kugelförmigen Schalen für den Fall untersucht, dass die Oberfläche dynamischen Belastungen ausgesetzt ist, die strahlenförmige Schwingungen produzieren. Zunächst werden Tranformationen der auftretended Gleichungen gesucht, die eine Lösung mit Hilfe von endlichen Hankeltransformations-Techniken zulassen. Eine solche Reduzierung ist für eine grosse Klasse von abstandsabhängigen Veränderungen der Dichte-und Elastizitätsparameter \:moglich. Die so erhaltenen Lösungen sind jedoch recht kompliziert, und zwei weitere Lösungsmöglichkeiten werden angedeutet. Einmal erhält man unter gewissen Beschränkungen bezüglich der Art der Inhomogenitäten eine Reduzierung des Gleichungssystems auf die gewögnliche Wellengleichung, zum anderen wird ein einfaches Korrespondensprinzip für das betrachtete Randwertproblem aufgestellt. Schliesslich wird eine asymptotische Wellenfrontanalyse entwickelt, die vielseitig verwendbar ist.
    Notes: Summary Transient displacement and stress in thick inhomogeneous cylindrical and spherical shells is investigated for situations when the surfaces are subjected to dynamic loads consistent with the production of radial vibrations. In the first instance, transformation of the governing equations is sought to a form amenable to solution via a finite Hankel transform technique. Such reduction is available for a broad class of radial variations in the material density and elastic parameters. However, the solutions generated by this method are rather involved and two other approaches are indicated. Thus, reduction of the system to the conventional wave equation is obtained under certain restrictions on the nature of the inhomogeneities and a simple correspondence principle is presented for the imposed boundary stress boundary value problem. Finally an asymptotic wave front analysis is presented which has a wide generality of application.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of engineering mathematics 20 (1986), S. 145-161 
    ISSN: 1573-2703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Technology
    Notes: Summary Bergman-type series solutions involving iterated complementary error integrals are constructed for nonlinear boundary-value problems associated with heat conduction in a region bounded internally by a cylindrical or spherical surface. In particular, a small-time solution is developed when the nonlinear boundary condition is of the Stefan-Boltzmann type. This solution is extended via Padé approximants.
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