899 resultados para Arbitrary dimension


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In this paper, an exact series solution for the vibration analysis of circular cylindrical shells with arbitrary boundary conditions is obtained, using the elastic equations based on Flügge's theory. Each of the three displacements is represented by a Fourier series and auxiliary functions and sought in a strong form by letting the solution exactly satisfy both the governing differential equations and the boundary conditions on a point-wise basis. Since the series solution has to be truncated for numerical implementation, the term exactly satisfying should be understood as a satisfaction with arbitrary precision. One of the important advantages of this approach is that it can be universally applied to shells with a variety of different boundary conditions, without the need of making any corresponding modifications to the solution algorithms and implementation procedures as typically required in other techniques. Furthermore, the current method can be easily used to deal with more complicated boundary conditions such as point supports, partial supports, and non-uniform elastic restraints. Numerical examples are presented regarding the modal parameters of shells with various boundary conditions. The capacity and reliability of this solution method are demonstrated through these examples. © 2012 Elsevier Ltd. All rights reserved.

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Includes bibliography

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Includes bibliography

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By means of a triple master action we deduce here a linearized version of the new massive gravity (NMG) in arbitrary dimensions. The theory contains a 4th-order and a 2nd-order term in derivatives. The 4th-order term is invariant under a generalized Weyl symmetry. The action is formulated in terms of a traceless ημνΩμνρ=0 mixed symmetry tensor Ωμνρ=-Ωμρν and corresponds to the massive Fierz-Pauli action with the replacement e μν=∂ρΩμνρ. The linearized 3D and 4D NMG theories are recovered via the invertible maps Ωμνρ=Ïμνρβhβμ and Ωμνρ=ÏμνργδT [γδ]μ respectively. The properties h μν=hνμ and T[[γδ]μ]= 0 follow from the traceless restriction. The equations of motion of the linearized NMG theory can be written as zero curvature conditions ∂νTρμ-∂ρT νμ=0 in arbitrary dimensions. © 2013 American Physical Society.

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Confronta las experiencias y conceptos sobre la incorporacion de la dimension ambiental en la planificacion del desarrollo, y explora para ello, proposiciones que permitan hacer mas efectiva la referida incorporacion a la luz de las dificultades y oportunidades que se presentan en la actual crisis de la region.

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Presenta las conclusiones y recomendaciones del Taller que tuvo por objetivo analizar la incorporacion de la dimension ambiental en la planificacion del desarrollo, la dimension ambiental en el Proyecto DRI-SUR, y las politicas ambientales de los organismos internacionales de financiamiento para el desarrollo.

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Contiene las conclusiones y recomendaciones del Taller que tuvo por objetivo analizar las politicas de desarrollo y sus perspectivas en el area de influencia de la Corporacion Autonoma Regional de la sabana de Bogota y de las cuencas de los rios Bogota, Ubate y Suarez (CAR), con el proposito de recomendar las vias mas favorables para incorporar la dimension ambiental en la planificacion.

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Contiene las conclusiones y recomendaciones del Taller que tuvo por objetivo analizar las politicas de desarrollo y sus perspectivas en el area de influencia del Complejo Colbun-Machicura, con el fin de recomendar las vias mas favorables para incorporar la dimension ambiental en los procesos de planificacion.

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Contiene las conclusiones y recomendaciones del Taller que tuvo por objetivo analizar las politicas de desarrollo y sus perspectivas en el area de influencia del aprovechamiento multiple de Salto Grande, con el fin de recomendar las vias mas favorables para incorporar la dimension ambiental en los procesos de planificacion.

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Contiene la organizacion, resena de los trabajos y conclusiones del Taller que tuvo por objetivo: 1) recoger y analizar la experiencia mexicana de incorporacion de la dimension ambiental en la planificacion, con miras a su perfeccionamiento y a sus posibilidades de cooperacion con otros paises y 2) analizar y discutir los criterios que podria sustentar esa cooperacion, a partir de analisis realizados en diversos paises de la region.