Now showing items 1-17 of 17

• #### A formula for the Kirchhoff index ﻿

(2007-09-30)
Article
Open Access
We show here that the Kirchhoff index of a network is the average of the Wiener capacities of its vertices. Moreover, we obtain a closed-form formula for the effective resistance between any pair of vertices when the ...
• #### Application of the forces' method in dynamic systems ﻿

(2007-10-11)
Article
Open Access
We present here some applications of the Forces's method in dynamic systems. In particular, we consider the problem of the approximation of the trajectories of a conservative system of point masses by means of the minimization ...
• #### Bounds on the first non-null eigenvalue for self-adjoint boundary value problems on networks ﻿

(2006-09)
Article
Open Access
We aim here at obtaining bounds on the first non-null eigenvalue for self-adjoint boundary value problems on a weighted network by means of equilibrium measures, that includes the study of Dirichlet, Neumann and Mixed ...
• #### Characterization of symmetric M-matrices as resistive inverses ﻿

(2007-01-25)
Article
Open Access
We aim here at characterizing those nonnegative matrices whose inverse is an irreducible Stieltjes matrix. Specifically, we prove that any irreducible Stieltjes matrix is a resistive inverse. To do that we consider the ...
• #### Computational cost of the Fekete problem ﻿

(2007-10-11)
Article
Open Access
We present here strong numerical and statistical evidence of the fact that the Smale's 7th problem can be answered affirmatively. In particular, we show that a local minimum for the logarithmic potential energy in the ...
• #### Estimación de los puntos de Fekete en la esfera unidad ﻿

(Universitat Politècnica de Catalunya, 2003-10)
Minor thesis
Open Access
Esta tesina se centra en el problema matemático de conseguir distribuir bien una cantidad cualquiera de puntos sobre la superficie de una esfera. Este problema admite multitud de variantes; nosotros estudiaremos tres de ...
• #### Estimation of Fekete points ﻿

(2005-05)
Article
Open Access
In this paper we present a new method to estimate Fekete points on surfaces. Although our method works in a general setting, we concentrate on its application to the unit sphere because it is the prototype problem and ...
• #### Fekete points in non-smooth surfaces ﻿

(2006-07)
Article
Open Access
In this paper we present a procedure for the estimation of the Fekete points on a wide variety of non-regular objects in $R^3$. We understand the problem of the Fekete points in terms of the identification of good ...
• #### Kirchhoff indexes of a network ﻿

(Elsevier, 2010-04-15)
Article
Restricted access - publisher's policy
In this work we define the effective resistance between any pair of vertices with respect to a value λ ≥ 0 and a weight ω on the vertex set. This allows us to consider a generalization of the Kirchhoff Index of a finite ...
• #### Modelling of Jet Grouting and its interactions with surrounding soils ﻿

(2012)
Conference report
Restricted access - confidentiality agreement
The versatility of Jet-Grouting as a soil improvement technique has made this procedure to be widely used in geotechnical engineering practice. In this work we discuss some aspects related to the THMC coupling phenomena ...
• #### Numerical simulation of THMC phenomena associated with jet-grouting ﻿

(Research Publishing, 2012)
Conference report
Restricted access - publisher's policy
A framework for the study of the jet-grouting hydration reaction and of the associated THMC interactions with the surrounding soils has been developed. In this work, we summarize the basic formulation that may be used for ...
• #### Potential Theory for boundary value problems on finite networks ﻿

(2006-07)
Article
Open Access
We aim here at analyzing self-adjoint boundary value problems on finite networks associated with positive semi-definite Schrödinger operators. In addition, we study the existence and uniqueness of solutions and its ...
• #### Regular boundary value problems on a path throughout Chebyshev Polynomials ﻿

(2006-08)
Article
Open Access
In this work we study the different types of regular boundary value problems on a path associated with the Schrödinger operator. In particular, we obtain the Green function for each problem and we emphasize the case of ...
• #### Smoothing of yield surfaces and a reformulation of multi-surface plasticity ﻿

(CIMNE, 2011)
Conference report
Open Access
In this work we describe a procedure for the smoothing of non-regular yield surfaces and plastic potential functions. We also present several application examples corresponding to different weell-known cases. Moreover, we ...
• #### Smoothing of yield surfaces and a reformulation of multi-surface plasticity ﻿

(Centro Internacional de Métodos Numéricos en Ingeniería (CIMNE), 2011)
Conference report
Open Access
In this work we describe a procedure for the smoothing of non-regular yield surfaces and plastic potential functions. We also present several application examples corresponding to different well-known cases. Moreover, we ...
• #### THMC modelling of jet grouting ﻿

(CIMNE, 2013)
Conference report
Open Access
A framework for the study of the jet-grouting hydration reaction and of the associated thermo-hydro-mechanical and chemical (THMC) interactions with the surrounding soils has been developed. In this work, we summarize the ...
• #### THMC modelling of jet grouting ﻿

(2013)
Conference report
Open Access
A framework for the study of the jet-grouting hydration reaction and of the associated thermo-hydro-mechanical and chemical (THMC) interactions with the surrounding soils has been developed. In this work, we summarize the ...