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Santander, Spain

University of Cantabria , is a public university located in Santander, Torrelavega and Comillas in Cantabria, Spain. It was founded in 1972 and is organized in 15 schools and colleges.It was selected as Campus of International Excellence by the Government of Spain in 2009. The UC is part, as a founding member, of the Group 9 of Spanish Universities , created in 1997 with the aim of promoting collaboration between academic institutions.The University of Cantabria first appeared in the Academic Ranking of World Universities in 2013 in the range of 151-200 best universities in the world in the field of Physics. Wikipedia.

San Cristobal J.R.,University of Cantabria
Renewable Energy | Year: 2011

The growing concern in the negative effects of fossil fuels on the environment has forced a more intensive use of Renewable Energy sources which are considered an important solution to the large atmospheric pollution caused from fossil fuel combustion. In the electricity-generating industry, due to the high costs associated with the construction and operation of plants and the regulations that enforce productivity evaluations, efficiency is a key managerial concept. DEA is a non-parametric method which produces detailed information on the efficiency of a unit, to be measured without any assumptions regarding the functional form of the production function. In this paper, the efficiency of 13 Renewable Energy technologies is evaluated through a Multiple Criteria Data Envelopment Analysis (MCDEA) model. Two additional criterion, the minsum and minimax criterion, are included in the model which are the most restrictive than that defined in the classical DEA. The results show that the only Decision Making Unit rated as efficient is the Windpower 10 ≤ P ≤ 50 MW technology and it can be considered the only non-dominated solution. © 2011 Elsevier Ltd. Source

Santos E.,University of Cantabria
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2010

It is assumed that, for weak space-time curvature, the main gravitational effect of the quantum vacuum stress energy corresponds to adding two terms to the Einstein-Hilbert action, proportional to the square of the curvature scalar and to the contraction of two Ricci tensors, respectively. It is shown that compatibility with terrestrial and Solar System observations implies that the square roots of the coefficients of these terms should be either a few millimeters or a few hundred meters. It is shown that the vacuum contribution increase the stability of massive white dwarfs. © 2010 The American Physical Society. Source

San Cristobal J.R.,University of Cantabria
Renewable and Sustainable Energy Reviews | Year: 2012

The capacity expansion planning problem of the renewable energy industry involves decisions regarding the optimal mix of different plant types, locations where each plant should be built, and capacity expansion decisions over the planning horizon for each plant. The aim of this paper is to develop a goal programming model, based on a multi-source multi-sink network, in order to locate five renewable energy plants for electric generation in five places located in the autonomous region of Cantabria, in the north of Spain. As different types of plants can be placed in each location, the goal is to locate one plant in each place, maximizing the number of plants that are matched with comparable locations, in a way that the total deviations from goals are minimized. © 2012 Elsevier Ltd. All rights reserved. Source

Pazo D.,University of Cantabria | Montbrio E.,University Pompeu Fabra
Physical Review X | Year: 2014

Large communities of biological oscillators show a prevalent tendency to self-organize in time. This cooperative phenomenon inspired Winfree to formulate a mathematical model that originated the theory of macroscopic synchronization. Despite its fundamental importance, a complete mathematical analysis of the model proposed by Winfree-consisting of a large population of all-to-all pulse-coupled oscillators-is still missing. Here, we show that the dynamics of the Winfree model evolves into the so-called Ott- Antonsen manifold. This important property allows for an exact description of this high-dimensional system in terms of a few macroscopic variables, and also allows for the full investigation of its dynamics. We find that brief pulses are capable of synchronizing heterogeneous ensembles that fail to synchronize with broad pulses, especially for certain phase-response curves. Finally, to further illustrate the potential of our results, we investigate the possibility of "chimera" states in populations of identical pulse-coupled oscillators. Chimeras are self-organized states in which the symmetry of a population is broken into a synchronous and an asynchronous part. Here, we derive three ordinary differential equations describing two coupled populations and uncover a variety of chimera states, including a new class with chaotic dynamics. Source

Brands S.,University of Cantabria
Journal of Applied Meteorology and Climatology | Year: 2013

It is demonstrated that boreal winter accumulated heating degree-days, a weather derivative product that is frequently demanded by energy suppliers (among others), can be skillfully predicted with a lead time of 1 month, that is, at the beginning of the previous November, for many regions of the Northern Hemisphere extratropics. This finding contradicts the assumption of poor seasonal predictability for this variable. This short paper is meant to properly inform the participants of the weather derivative market to assure market transparency and to foster a scientific discussion on how to disseminate this formerly unknown expert knowledge. © 2013 American Meteorological Society. Source

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