Water Trade in Andalusia. Virtual Water: an alternative way to manage water demand

The main idea of this paper is to analyse the relationships between the productive process and the commercial trade with water resources used by them. For that, the first goal is to find out, by means of the estimation of virtual water, the exported crops which have the highest water consumption. Similarly, we analyse the crops that are imported and therefore, might contribute to save water. The second objective is to put forward new ways to save water by means of the virtual water trade. This first conclusion contradicts not only the comparative advantages theory but also the environmental sustainability logic. The previous conclusion is derived from the great exports of water via potatoes and vegetables, and also via citrus fruit and orchards; and, on the other hand, from the imports, such as cereals and arable crops, with lower water requirements. The second conclusion affirms as Andalusia utilises large amounts of water in its exports, and in turn, it does not produce goods with low water requirements, the potential saving would be very significant if the terms of our trade were the other way round. We are convinced that the agricultural sector must modify the use of water to a great extent in order to reach significant water savings and an environmental sustainability path.Virtual Water, Water Trade, Water Demand, Andalusia

Equivalent and Alternative Forms for BF Gravity with Immirzi Parameter

A detailed analysis of the BF formulation for general relativity given by Capovilla, Montesinos, Prieto, and Rojas is performed. The action principle of this formulation is written in an equivalent form by doing a transformation of the fields of which the action depends functionally on. The transformed action principle involves two BF terms and the two Lorentz invariants that appear in the original action principle generically. As an application of this formalism, the action principle used by Engle, Pereira, and Rovelli in their spin foam model for gravity is recovered and the coupling of the cosmological constant in such a formulation is obtained

Impact Analysis and Extraction Method: Applications on water resources in Andalusia

The objective of this work is to deepen in the relationships between the andalusian productive system and the water consumption. We will use an Impact Analysis and the Extraction Method. The first one allows us to study how it would affect to the regional water consumption a change in the sectorial demand. The second one allows us to simulate how it would affect to the water consumption the hypothetical extraction of a certain sector of the economic system. This study allows us to conclude that a reduction in the exports of some sectors would affect positively on the water saving; and that the extraction, fundamentally of the agro-alimentary industry, would considerably reduce the consumption of this resource. Before this reality we raised the possibility of considering a structural change in the region that consists of a productive specialization less water consumer.Input-Output analysis, Water consumption, Andalusian

Quantum chaos and nuclear mass systematics

The presence of quantum chaos in nuclear mass systematics is analyzed by considering the differences between measured and calculated nuclear masses as a time series described by the power law 1/ f^alpha. While for the liquid droplet model plus shell corrections a quantum chaotic behavior alpha approx 1 is found, errors in the microscopic mass formula have alpha approx 0.5, closer to white noise. The chaotic behavior seems to arise from many body effects not included in the mass formula.Comment: 4 pages, 6 figures, replaced to match the published versio

The CMV bispectral problem

A classical result due to Bochner classifies the orthogonal polynomials on the real line which are common eigenfunctions of a second order linear differential operator. We settle a natural version of the Bochner problem on the unit circle which answers a similar question concerning orthogonal Laurent polynomials and can be formulated as a bispectral problem involving CMV matrices. We solve this CMV bispectral problem in great generality proving that, except the Lebesgue measure, no other one on the unit circle yields a sequence of orthogonal Laurent polynomials which are eigenfunctions of a linear differential operator of arbitrary order. Actually, we prove that this is the case even if such an eigenfunction condition is imposed up to finitely many orthogonal Laurent polynomials.Comment: 25 pages, final version, to appear in International Mathematics Research Notice

Reseñas

Índex de l'obra ressenyada: David ROAS y Patricia GARCÍA (eds.), Visiones de lo fantástico (aproximaciones teóricas). Málaga: e.d.a editores, 2013. David ROAS y Ana CASAS (eds.), Visiones de lo fantástico en la cultura española (1900-1970). Málaga: e.d.a editores, 2013