Now showing items 11446-11465 of 76942

• #### Bouncing loop quantum cosmology from F(T) gravity ﻿

(2013-05)
Article
Open Access
The big bang singularity could be understood as a breakdown of Einstein’s general relativity at very high energies. By adopting this viewpoint, other theories that implement Einstein cosmology at high energies might solve ...
• #### Bouncing loop quantum cosmology in Gauss-Bonnet gravity ﻿

(American Physical Society, 2015-12-11)
Article
Open Access
We develop an effective Gauss-Bonnet extension of loop quantum cosmology, by introducing holonomy corrections in modified F(G) theories of gravity. Within the context of our formalism, we provide a perturbative expansion ...
• #### Bouncing of bubbles impacting at a free surface ﻿

(2009)
Conference report
Open Access
• #### Boundary conditions for gradient-enhanced models with smoothed displacements ﻿

(2012)
Article
Open Access
Los modelos de gradiente basados en desplazamientos suavizados son una alternativa a los modelos estándares para simular numéricamente el proceso de fallo de materiales. En esta formulación alternativa coexisten los ...
• #### Boundary element method based on preliminary discretization ﻿

(2014-03)
Article
Open Access
A new numerical method for solving wave diffraction problems is given. The method is based on the concept of boundary elements; i.e., the unknown values are the field values on the surface of the scatterer. An analog of a ...
• #### Boundary layer analysis and heat transfer of a nanofluid ﻿

(2014-08)
Article
Open Access
A theoretical model for nanofluid flow, including Brownian motion and thermophoresis, is developed and analysed. Standard boundary layer theory is used to evaluate the heat transfer coefficient near a flat surface. The ...
• #### Boundary layer effects on the vortex shedding in a Donaldsontype hydrofoil ﻿

(2014)
Conference lecture
Open Access
Fluid - Structure Interaction (FSI) phenomena is becoming a relevant study field for the design or revamping of hydropower plants. The generalized trend of increasing flow rates and reducing rotor blades/stay vanes thickness ...
• #### Boundary Layer Late Afternoon and Sunset Turbulence: the BLLAST 2011 experiment ﻿

(2012)
Conference report
Open Access
• #### Boundary regularity for the fractional heat equation ﻿

(Universitat Politècnica de Catalunya, 2014-09)
Bachelor thesis
Open Access
In this dissertation we present an introduction to nonlocal operators, and in particular, we study the fractional heat equation, which involves the fractional Laplacian of order 2s. In the first chapters we make a review ...
• #### Boundary value problems for Schrödinger operators on a path ﻿

(2012-05-25)
External research report
Open Access
In this work, we concentrate on determining explicit expressions, via suitable orthogonal polynomials on the line, for the Green function associated with any regular boundary value problem on a weighted path, whose weights ...
• #### Boundary value problems for Schrödinger operators on a Path Associated to Orthogonal Polynomials ﻿

(Springer, 2013)
Part of book or chapter of book
Restricted access - publisher's policy
In this work, we concentrate on determining explicit expressions, via suitable orthogonal polynomials on the line, for the Green function associated with any regular boundary value problem on a weighted path, whose weights ...
• #### Boundary-type sets and product operators in graphs ﻿

(2010)
Conference lecture
Open Access
• #### Bounded and dissipative solutions of the Bouc-Wen model for hysteretic structural systems ﻿

(2004-06)
Part of book or chapter of book
Open Access
The aim of this paper is to give the conditions on the hysteretic Bouc-Wen model so that (i) it has the property of being bounded input bounded output (BIBO), and (ii) it dissipates energy (or is passive). This study leads ...
• #### Bounded expansion in models of webgraphs ﻿

(2007-10-02)
Article
Open Access
We study the bounded expansion of several models of web graphs. We show that various deterministic graph models for large complex networks have constant bounded expansion.We study two random models of webgraphs, showing ...
• #### Bounded model checking for asynchronous concurrent systems ﻿

(Universitat Politècnica de Catalunya, 2014-03-04)
Doctoral thesis
Open Access
• #### Bounded solutions of some nonlinear elliptic equations in cylindrical domains ﻿

(1997)
Article
Open Access
The existence of a (unique) solution of the second order semilinear elliptic equation $$\sum^{n}_{i,j=0}a_{ij}(x)u_{x_{i}x_{j}}+f(\nabla u,u,x)=0$$ with $x=(x_{0},x_{1},\dots, x_{n})\in (s_{0},\infty )\times \Omega '$, ...
• #### Bounded synchronization in resistive multi-terminal VSC-HVDC transmission systems ﻿

(Institute of Electrical and Electronics Engineers (IEEE), 2014)
Conference report
Restricted access - publisher's policy
Multi-terminal VSC-HVDC transmission is a promising solution to transport energy from the generating plants to the distribution stations, and the number and size of the corresponding power grids is expected to increase in ...
• #### Bounded-width QBF is PSPACE-complete ﻿

(Schloss Dagstuhl - Leibniz-Zentrum für Informatik, 2013)
Conference report
Open Access
Tree-width is a well-studied parameter of structures that measures their similarity to a tree. Many important NP-complete problems, such as Boolean satisﬁability (SAT), are tractable on bounded tree-width instances. In ...
• #### Bounded-width QBF is PSPACE-complete ﻿

(2014-11-01)
Article
Restricted access - publisher's policy
Tree-width and path-width are two well-studied parameters of structures that measure their similarity to a tree and a path, respectively. We show that QBF on instances with constant path-width, and hence constant tree-width, ...
• #### Bounding Hilbert Space dimension from Temporal Correlations ﻿

(Universitat Politècnica de Catalunya, 2009-09-09)
Master thesis
Open Access
In this work, we tackle the problem of assessing the Hilbert space dimension from the set of correlations obtained when measuring in a nonlocal black box scheme. The concept of a dimension witness and its recent applications ...