69,451 research outputs found
Random matrix study for a three-terminal chaotic device
We perform a study based on a random-matrix theory simulation for a
three-terminal device, consisting of chaotic cavities on each terminal. We
analyze the voltage drop along one wire with two chaotic mesoscopic cavities,
connected by a perfect conductor, or waveguide, with one open mode. This is
done by means of a probe, which also consists of a chaotic cavity that measure
the voltage in different configurations. Our results show significant
differences with respect to the disordered case, previously considered in the
literature.Comment: Proccedings of the V Leopoldo Garcia-Colin Mexican Meeting on
Mathematical and Experimental Physic
Multicriteria Modelling of Irrigation Water Market at Basin Level
This paper develops a multi-criteria methodology to simulate irrigation water markets at basin level. For this purpose it is assumed that irrigators try to optimise personal multi-attribute utility functions via their productive decision making process (crop mix), subject to a set of constraints based upon the structural features of their farms. In this sense, farmers with homogeneous behaviour regarding water use have been grouped, such groups being established as .types. to be considered in the whole water market simulation model. This model calculates the equilibrium through a solution that maximises aggregate welfare, which is quantified as the sum of the multi-attribute utilities reached by each of the participating agents. This methodology has been empirically applied for the Duero Basin (Northern Spain), finding that the implementation of this institution would increase economic efficiency and agricultural labour demand, particularly during droughts.Water markets, Multi-Attribute Utility Theory, Irrigation water, Duero Valley (Spain).
Study of the reaction and an alternative explanation for the " pentaquark" peak
We present a calculation of the reaction with the
aim of seeing if the experimental peak observed in the invariant mass
around 1526 MeV, from where evidence for the existence of the has
been claimed, can be obtained without this resonance as a consequence of the
particular dynamics of the process and the cuts applied in the experimental set
up. We find that a combination of facts leads indeed to a peak around 1530 MeV
for the invariant mass of without the need to invoke any new resonance
around this energy. This, together with statistical fluctuations that we prove
to be large with the statistics of the experiment, is likely to produce the
narrower peak observed there.Comment: published versio
Orthogonal Polynomials on the Unit Ball and Fourth-Order Partial Differential Equations
The purpose of this work is to analyse a family of mutually orthogonal
polynomials on the unit ball with respect to an inner product which includes an
additional term on the sphere. First, we will get connection formulas relating
classical multivariate orthogonal polynomials on the ball with our family of
orthogonal polynomials. Then, using the representation of these polynomials in
terms of spherical harmonics, algebraic and differential properties will be
deduced
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