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Search Results: 1 - 10 of 413143 matches for " Rafael M. Rubio "
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Complete constant mean curvature spacelike hypersurfaces in the Einstein-de Sitter spacetime
Rafael M. Rubio
Physics , 2014,
Abstract: Uniqueness and non-existence results on complete constant mean curvature spacelike hypersurfaces lying between two spacelike slice in the Einstein-de Sitter spacetime are given. They are obtained from a Liouvielle-type theorem applied to a distinguished smooth function on a constant mean curvature hypersurface.
Applicability of Hydrus-1D in a Mediterranean Mountain Area Submitted to Land Use Changes
Carles M. Rubio,Rafael Poyatos
ISRN Soil Science , 2012, DOI: 10.5402/2012/375842
A Nonlinear Inequality Arising in Geometry and Calabi-Bernstein Type Problems
Alfonso Romero,Rafael M. Rubio
Journal of Inequalities and Applications , 2010, DOI: 10.1155/2010/950380
Characterization of umbilic points of isometric immersions in Riemannian and Lorentzian manifolds
Magdalena Caballero,Rafael M. Rubio
Mathematics , 2015,
Abstract: Several characterizations of umbilic points of submanifolds in arbitrary Riemannian and Lorentzian manifolds are given. As a consequence, we obtain new characterizations of spheres in the Euclidean space and of hyperbolic spaces in the Lorentz-Minkowski space.
Compact spacelike surfaces whose mean curvature function satisfies a nonlinear inequality in a 3-dimensional Generalized Robertson-Walker spacetime
Alfonso Romero,Rafael M. Rubio
Mathematics , 2014,
Abstract: Spacelike surfaces in Generalized Robertson-Walker spacetimes whose mean curvature function satisfies a natural nonlinear inequality are analyzed. Several uniqueness and nonexistence results for such compact spacelike surfaces are proved. In the nonparametric case, new Calabi-Bernstein type problems are solved as a consequence.
A dual rigidity of the sphere and the hyperbolic plane
Magdalena Caballero,Rafael M. Rubio
Mathematics , 2015,
Abstract: There are several well-known characterizations of the sphere as a regular surface in the Euclidean space. By means of a purely synthetic technique, we get a rigidity result for the sphere without any curvature conditions, nor completeness or compactness. As well as a dual result for the hyperbolic plane, the spacelike sphere in the Minkowski space.
An analytical approach to the external force-free motion of pendulums on surfaces of constant curvature
Rafael M. Rubio,Juan Jesús Salamanca
Physics , 2014,
Abstract: The dynamics of force free motion of pendulums on surfaces of constant Gaussian curvature is addressed when the pivot moves along a geodesic obtaining the Lagragian of the system. As a application it is possible the study of elastic and quantum pendulums.
Complete Spacelike Hypersurfaces in Generalized Robertson-Walker and the Null Convergence Condition. Calabi-Bernstein problems
Juan A. Aledo,Rafael M. Rubio,Juan J. Salamanca
Mathematics , 2015,
Abstract: We study constant mean curvature spacelike hypersurfaces in generalized Robertson-Walker spacetimes which are spatially parabolic covered (i.e. its fiber F is a (non- compact) complete Riemannian manifold whose universal covering is parabolic) and satisfy the null convergence condition. In particular, we provide several rigidity results under appro- priate mathematical and physical assumptions. We pay special attention to the case where the GRW spacetime is Einstein. As an application, some Calabi-Bernstein type results are given.
Constant mean curvature spacelike hypersurfaces in Lorentzian warped products and Calabi-Bernstein type problems
Juan A. Aledo,Alfonso Romero,Rafael M. Rubio
Mathematics , 2014,
Abstract: In this paper we provide several uniqueness and non-existence results for complete parabolic constant mean curvature spacelike hypersurfaces in Lorentzian warped products under appropriate geometric assumptions. As a consequence of this parametric study, we obtain very general uniqueness and non-existence results for a large family of uniformly elliptic EDP's, so solving the Calabi-Bernstein problem in a wide family of spacetimes.
Peritonitis esclerosante encapsulante asociada a la diálisis peritoneal: Una revisión y una iniciativa unitaria europea para abordar el cuidado de una enfermedad rara
De Sousa,Erika; del Peso-Gilsanz,Gloria; Bajo-Rubio,M. Auxiliadora; Ossorio-González,Marta; Selgas-Gutiérrez,Rafael;
Nefrología (Madrid) , 2012, DOI: 10.3265/Nefrologia.pre2012.Jul.11615
Abstract: encapsulating peritoneal sclerosis (eps) represents a rare complication in peritoneal dialysis (pd) with high mortality. it is characterised by diffuse peritoneal membrane fibrosis, which develops into encapsulation and manifests as clinical signs and symptoms of intestinal obstruction. its incidence varies from 0.7%to 3.3%. the most significant risk factor in its development is exposure time to pd solutions, although young age and peritonitis episodes can also contribute. its aetiopathogeny has not been clearly explained and it is thought that a second hit like peritonitis, hemoperitoneum, surgery, genetic predisposition, etc on an already damaged peritoneal membrane, could also trigger the development of eps. some cases appear after transfer to haemodialysis or after transplant. in these cases, the use of calcineurin inhibitors is believed to be related. the presence of clinical symptoms and signs of intestinal obstruction, along with compatible radiological and/or anatomical findings could also confirm the diagnosis. at present there are no clinical or biochemical markers capable of predicting its onset. therapeutic management comprises the use of immunosuppressors like steroids and tamoxifen, nutritional management and even surgery in advanced cases, all of which provide varying results. this article discusses the diagnosis and treatment of eps, it encourages the participation in the european registry and it advocates the need to centralise the management of this medical complication.
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