Generalized Gravity
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Dynamic Instability of Beams Under Tip Follower Forces Using Geometrically Exact, Fully Intrinsic Equations
Abstract In this study, the dynamic instability of beams under tip follower forces are considered. The beam is modeled by using the geometrically exact, fully intrinsic beam equations which is subjected to an inclined tip follower force. Generalized differential quadrature method is employed to solve the governing equations. The effect of different parameter
Lat. Am. j. solids struct.. Publicado em: 2016-12
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2. 10-dimensional cosmology with Gauss-Bonnet gravity in generalized scalar-tensor theories from superstring theories
Superstring theories are promising candidates for unifying gravity with all matter interactions. In this work, we discussed a particular 10-dimensional cosmology based on Gauss-Bonnet invariant term coupled to a generalized scalar-tensor theory as resulting from superstring theories. Some interesting features concerning the late-time dynamics are explored an
Brazilian Journal of Physics. Publicado em: 2010-06
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3. Análise geométrica e dinâmica de modelos de gravidade generalizada / Geometrical and Dynamical Analysis of Generalized Gravity Models
This work aims the investigation of some dynamical aspects of generalized gravity models, namely scalar-tensor and f(R) models. These models intend to solve in a more natural way the problem of the existence of the dark energy, which is supposedly the component of the Universe that causes its accelerated expansion. In a null spatial curvature Friedmann-Lema�
Publicado em: 2008
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4. Generalized uncertainty principle, extra-dimensions and holography
We consider Uncertainty Principles which take into account the role of gravity and the possible existence of extra spatial dimensions. Explicit expressions for such Generalized Uncertainty Principles in 4+n dimensions are given and their holographic properties investigated. In particular, we show that the predicted number of degrees of freedom enclosed in a
Brazilian Journal of Physics. Publicado em: 2005-06
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5. Lagrangian multipliers for coast-arcs of optimum space trajectories
Some properties of generalized canonical systems - special dynamical systems described by a Hamiltonian function linear in the adjoint variables - are applied in determining the solution of the two-dimensional coast-arc problem in an inverse-square gravity field. A complete closed-form solution for Lagrangian multipliers - adjoint variables - is obtained by
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2001
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6. Integrated structural/control optimization of a large space structure with articulation subject to the gravity-gradient torque.
Optimization has been playing a very important role in the orbit and attitude control, and structural design of spacecraft since the advent of the space era. It is well known that weight, space, energy, and time are among the most important constraints that guide the space missions planning. the optimization has a wide field of applications even if only the
Publicado em: 1998
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7. Modelagem bidimensional da injeção de agua em reservatorios heterogeneos
This work studies the application of strearntube theory joined with a two-porosity linear model in heterogeneous reservoirs under injection of a incompressible wetting fluid and the production of a non-wetting fluid. It was considered that the streamlines are fixed and there is no flow between each channel. Gravity was neglected and the imbibition phenomena
Publicado em: 1996
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8. Extended random sequential adsorption model of irreversible deposition processes: From simulations to experiments
An experimental study of the irreversible deposition of colloidal particles of various radii R on a solid surface is presented over a wide range of the Péclet number, Pe, or reduced radius R* (Pe = R*4). The experimental data are analyzed by means of a new generalized random sequential adsorption model that takes explicitly the diffusion of the particles du
The National Academy of Sciences.
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9. Loss-of-Function Mutations of ROOT HAIR DEFECTIVE3 Suppress Root Waving, Skewing, and Epidermal Cell File Rotation in Arabidopsis1
Wild-type Arabidopsis (Arabidopsis thaliana L. Heynh.) roots growing on a tilted surface of impenetrable hard-agar media adopt a wave-like pattern and tend to skew to the right of the gravity vector (when viewed from the back of the plate through the medium). Reversible root-tip rotation often accompanies the clockwise and counterclockwise curves that form e
American Society of Plant Biologists.