Articles de revista
http://hdl.handle.net/2117/3918
2015-10-04T04:05:23ZThe autumn 1919 Torremendo (Jacarilla) earthquake series (SE Spain)
http://hdl.handle.net/2117/77262
The autumn 1919 Torremendo (Jacarilla) earthquake series (SE Spain)
Batlló Ortiz, Josep; Martinez Solares, Jose Manuel; Macià Jové, Ramon; Stich, Daniel; Morales Soto, Jose; Garrido, Lurdes
On 10th September 1919 several slightly damaging earthquakes struck the towns of Torremendo, Jacarilla (near Alicante, SE-Spain) and others nearby. Available magnitude estimations for the largest two events of the series are M = 5 approx. They were earthquakes of moderate size and they occurred in a region where similar magnitude earthquakes, thoroughly studied, occurred recently (1999 Mula; 2002 Bullas; 2005 La Paca; 2011 Lorca). This makes these events of interest for a better definition of the regional seismicity. We study their sources from the analysis of the available contemporary seismograms and related documents. A total of 23 seismograms from 9 seismic stations have been collected and digitized. These seismograms contain records for the two main events and several aftershocks of the earthquake series. Finally 44 files, corresponding to 44 recorded single component records from the different events have been processed. The events have been relocated and their magnitudes recalculated. Also, original macroseismic information for these events was recovered. A macroseismic evaluation of the series has been performed. Intensity data points have been recalculated and macroseismic location and magnitude obtained. We conclude that these are the largest earthquakes occurred in the region since the beginning of instrumental recording, with Mw = 5.5 for the largest shock, and that the available data could be compatible with a thrust mechanism related to blind faults in the Bajo Segura region.
2015-01-01T00:00:00ZJust apply the AM-GM
http://hdl.handle.net/2117/77115
Just apply the AM-GM
Díaz Barrero, José Luis; Gispert Sánchez, Francesc
2015-02-01T00:00:00ZProblem B-1162: a bound for a sum of square roots
http://hdl.handle.net/2117/77114
Problem B-1162: a bound for a sum of square roots
Díaz Barrero, José Luis
2015-02-01T00:00:00ZUsing linguistic descriptions with multi-criteria decision aid approaches in urban energy systems
http://hdl.handle.net/2117/77112
Using linguistic descriptions with multi-criteria decision aid approaches in urban energy systems
Afsordegan, Arayeh; Sánchez Soler, Monica; Agell Jané, Núria; Gamboa Jimenez, Gonzalo; Cremades Oliver, Lázaro Vicente
Multi-Criteria Decision Aid (MCDA) methods include various collections of mathematical techniques related to decision support systems in non-deterministic environments to support such applications as facility management, disaster management and urban planning. This paper applies MCDA approaches based on qualitative reasoning techniques with linguistic
labels assessment. The aim of this method is ranking multi-attribute alternatives in group decision-making with qualitative labels. Finally this method is applied to a case of urban planning in selection of the less energy consumption project in a geographical area in Catalonia.
2015-02-01T00:00:00ZReduction of polysymplectic manifolds
http://hdl.handle.net/2117/77056
Reduction of polysymplectic manifolds
Marrero, Juan Carlos; Román Roy, Narciso; Salgado Seco, Modesto; Vilariño, Silvia
The aim of this paper is to generalize the classical Marsden-Weinstein reduction procedure for symplectic manifolds to polysymplectic manifolds in order to obtain quotient manifolds which inherit the polysymplectic structure. This generalization allows us to reduce polysymplectic Hamiltonian systems with symmetries, such as those appearing in certain kinds of classical field theories. As an application of this technique, an analogue to the Kirillov-Kostant- Souriau theorem for polysymplectic manifolds is obtained and some other mathematical examples are also analyzed. Our procedure corrects some mistakes and inaccuracies in previous papers (Gunther 1987 J. Differ. Geom. 25 23-53; Munteanu et al 2004 J. Math. Phys. 45 1730-51) on this subject.
2015-02-06T00:00:00ZProblem 5334: A sum of products
http://hdl.handle.net/2117/77055
Problem 5334: A sum of products
Díaz Barrero, José Luis
2015-01-01T00:00:00ZSolution to problem 5317
http://hdl.handle.net/2117/77054
Solution to problem 5317
Díaz Barrero, José Luis
2015-01-01T00:00:00ZExtensions and presentations of transversal matroids
http://hdl.handle.net/2117/77053
Extensions and presentations of transversal matroids
Bonin, Joseph; Mier Vinué, Anna de
A transversal matroid MM can be represented by a collection of sets, called a presentation of MM, whose partial transversals are the independent sets of MM. Minimal presentations are those for which removing any element from any set gives a presentation of a different matroid. We study the connections between (single-element) transversal extensions of MM and extensions of presentations of MM. We show that a presentation of MM is minimal if and only if different extensions of it give different extensions of MM; also, all transversal extensions of MM can be obtained by extending the minimal presentations of MM. We also begin to explore the partial order that the weak order gives on the transversal extensions of MM.; A transversal matroid MM can be represented by a collection of sets, called a presentation of MM, whose partial transversals are the independent sets of MM. Minimal presentations are those for which removing any element from any set gives a presentation of a different matroid. We study the connections between (single-element) transversal extensions of MM and extensions of presentations of MM. We show that a presentation of MM is minimal if and only if different extensions of it give different extensions of MM; also, all transversal extensions of MM can be obtained by extending the minimal presentations of MM. We also begin to explore the partial order that the weak order gives on the transversal extensions of MM.
2015-11-02T00:00:00ZProper generalized decomposition of a geometrically parametrized heat problem with geophysical applications
http://hdl.handle.net/2117/77020
Proper generalized decomposition of a geometrically parametrized heat problem with geophysical applications
Zlotnik, Sergio; Díez, Pedro; Modesto Galende, David; Huerta, Antonio
The solution of a steady thermal multiphase problem is assumed to be dependent on a set of parameters describing the geometry of the domain, the internal interfaces and the material properties. These parameters are considered as new independent variables. The problem is therefore stated in a multidimensional setup. The proper generalized decomposition (PGD) provides an approximation scheme especially well suited to preclude dramatically increasing the computational complexity with the number of dimensions. The PGD strategy is reviewed for the standard case dealing only with material parameters. Then, the ideas presented in [Ammar et al., Parametric solutions involving geometry: A step towards efficient shape optimization. Comput. Methods Appl. Mech. Eng., 2014; 268:178-193] to deal with parameters describing the domain geometry are adapted to a more general case including parametrization of the location of internal interfaces. Finally, the formulation is extended to combine the two types of parameters. The proposed strategy is used to solve a problem in applied geophysics studying the temperature field in a cross section of the Earth crust subsurface. The resulting problem is in a 10-dimensional space, but the PGD solution provides a fairly accurate approximation (error 1%) using less that 150 terms in the PGD expansion. Copyright (c) 2015John Wiley & Sons, Ltd.
2015-09-07T00:00:00ZTraveling wave solutions in a half-space for boundary reactions
http://hdl.handle.net/2117/77011
Traveling wave solutions in a half-space for boundary reactions
Cabré Vilagut, Xavier; Consul Porras, M. Nieves; Mande Nieto, José Vicente
We prove the existence and uniqueness of a traveling front and of its speed for the homogeneous heat equation in the half-plane with a Neumann boundary reaction term of unbalanced bistable type or of combustion type. We also establish the monotonicity of the front and, in the bistable case, its behavior at infinity. In contrast with the classical bistable interior reaction model, its behavior at the side of the invading state is of power type, while at the side of the invaded state its decay is exponential. These decay results rely on the construction of a family of explicit bistable traveling fronts. Our existence results are obtained via a variational method, while the uniqueness of the speed and of the front rely on a comparison principle and the sliding method.
2015-01-01T00:00:00Z