The Area Quantum and Snyder Space

We show that in the Snyder space the area of the disc and of the sphere can be quantized. It is also shown that the area spectrum of the sphere can be related to the Bekenstein conjecture for the area spectrum of a black hole horizon.Comment: 7 pages, in Press, Physics Letters

Distributed multivariate regression with unknown noise covariance in the presence of outliers: an MDL approach

We consider the problem of estimating the coefficients in a multivariable linear model by means of a wireless sensor network which may be affected by anomalous measurements. The noise covariance matrices at the different sensors are assumed unknown. Treating outlying samples, and their support, as additional nuisance parameters, the Maximum Likelihood estimate is investigated, with the number of outliers being estimated according to the Minimum Description Length principle. A distributed implementation based on iterative consensus techniques is then proposed, and it is shown effective for managing outliers in the data.Peer ReviewedPostprint (author's final draft

Non-linear dynamic analysis of the response of moored floating structures

© 2016 Elsevier Ltd. The complexity of the dynamic response of offshore marine structures requires advanced simulations tools for the accurate assessment of the seakeeping behaviour of these devices. The aim of this work is to present a new time-domain model for solving the dynamics of moored floating marine devices, specifically offshore wind turbines, subjected to non-linear environmental loads. The paper first introduces the formulation of the second-order wave radiation-diffraction solver, designed for calculating the wave-floater interaction. Then, the solver of the mooring dynamics, based on a non-linear Finite Element Method (FEM) approach, is presented. Next, the procedure developed for coupling the floater dynamics model with the mooring model is described. Some validation examples of the developed models, and comparisons among different mooring approaches, are presented. Finally, a study of the OC3 floating wind turbine concept is performed to analyze the influence of the mooring model in the dynamics of the platform and the tension in the mooring lines. The work comes to the conclusion that the coupling of a dynamic mooring model along with a second-order wave radiation-diffraction solver can offer realistic predictions of the floating wind turbine performance.Postprint (published version

La extradición en el gobierno de la Prosperidad Democrática: caracterización y análisis de la extradición pasiva a Estados Unidos entre 2011 y 2014

21 p.La extradición, en su concepción clásica, es un instrumento de cooperación judicial internacional o de asistencia judicial entre Estados soberanos. Su carácter instrumental respecto del ejercicio del ius puniendi por los Estados se orienta a que las fronteras territoriales no constituyan un obstáculo absoluto a sus pretensiones punitivas. No obstante, también son múltiples los debates alrededor de la cesión de soberanía que implica este tipo de figuras, frente a los cuales se responde que la naturaleza de la fuente específica que las regula -los tratados- y el principio de reciprocidad -cuyo fundamento es el acuerdo interestatal y el reconocimiento de un igual estatus internacional de los Estados- resultan ser un reflejo de esta soberanía.El presente capítulo forma parte del proceso de investigación formativa adelantado en el marco del Observatorio de Cooperación Internacional y Administración de Justicia Penal de la Universidad Católica de Colombia, en el marco del proyecto “Análisis y monitoreo de los procesos de extradición de nacionales colombianos a los Estados Unidos de América”.Introducción Sobre el proceso de investigación: breve mención de la metodología Antecedentes: la extradición como mecanismo de lucha contra las drogas La extradición como institución jurídica Caracterización de las solicitudes y los conceptos de extradición, periodo 2010-2014 Sobre las solicitudes de extradición con Estados Unido