Ignasi Colominas

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Tumor angiogenesis, the growth of new capillaries from preexisting ones promoted by the starvation and hypoxia of cancerous cell, creates complex biological patterns. These patterns are captured by a hybrid model that involves high-order partial differential equations coupled with mobile, agent-based components. The continuous equations of the model rely on(More)
A model for the propagation of water waves is presented, which retrieves the concepts of rays and fronts from the geometrical optics approximation. Their definition here is nevertheless different in that it considers both refraction and diffraction, solving thus most of the problems usually associated with ray methods. Gregorio Iglesias, Juan R. Acinas and(More)
Abstract. Substation grounding design involves computing the equivalent resistance of the earthing system —for reasons of equipment protection—, as well as distribution of potentials on the earth surface —for reasons of human security— when fault conditions occur. While very crude approximations were available in the sixties, several methods have been(More)
In this paper, we present a numerical model based on the boundary element method that allows to analyze the grounding systems (GSs) of aboveground and underground substations under different locations and considerations. The proposed formulation allows to consider most of the specific properties and conditions of this kind of substations, i.e., complex(More)
Cancerous tumours have the ability to recruit new blood vessels through a process called angiogenesis. By stimulating vascular growth, tumours get connected to the circulatory system, receive nutrients and open a way to colonize distant organs. Tumour-induced vascular networks become unstable in the absence of tumour angiogenic factors (TAFs). They may(More)
We present a new high-accurate, stable and low-dissipative Smooth Particle Hydrodynamics (SPH) method based on Riemann solvers. The method derives from the SPH-ALE formulation first proposed by Vila and Ben Moussa. Moving Least Squares approximations are used for the reconstruction of the variables and the computation of Taylor expansions. The stability of(More)
We present a numerical formulation for grounding analysis that has been enterely developed by the authors within the last years. This approach is based on the Boundary Element Method and it has been implemented in a freeware application for the in-house computer aided design and analysis of grounding grids. The actual version of this software (TOTBEM) is(More)
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