Consistent high-energy constraints in the anomalous QCD sector

The anomalous Green function and related form-factors (pi^0 to gamma^* gamma^* and tau^- to X^- nu_tau vector form-factors, with X^-=(KKpi)^-, phi^- gamma, (phi V)^-) are analyzed in this letter in the large-N_C limit. Within the single (vector and pseudoscalar) resonance approximation and the context of Resonance Chiral Theory, we show that all these observables over-determine in a consistent way a unique set of compatible high-energy constraints for the resonance couplings. This result is in agreement with analogous relations found in the even intrinsic-parity sector of QCD like, e.g., F_V^2 = 3 F^2. The antisymmetric tensor formalism is considered for the spin-one resonance fields. Finally, we have also worked out and provide here the relation between the two bases of odd intrinsic-parity Lagrangian operators commonly employed in the literature.Comment: 11 pages, no figures. Comparison with the phenomenology extended. Matches version to be published in PL

Climate change and birds: have their ecological consequences already been detected in the mediterranean region?

Global climate has already warmed by 0.6 ºC, mainly due to human activities, over the second half of the XXth century. Recent studies have shown that it is possible to detect the effects of a changing climate on individual and ecosystem levels. Among biologists, there is a growing concern about how global climate change may affect the phenology, physiology and distribution of plants and animals. Many phenological processes, such as the date of flowering, leaf unfolding, insect appearance, and bird reproduction and migration, have been affected by recent climate change. Although it is difficult to prove that climate change has been the cause of these effects, these findings emphasise the need to consider climate change for current and future conservation efforts. There is a particular interest in the study of how species have responded to climatic changes in the past in order to guess or predict how they may respond to future changes in different regions. Few bird studies and even fewer long-term bird data sets are currently available in the Mediterranean area. Therefore, it is essential for the scientific community, policy-makers and the general public to make them available. Amateur naturalist and ornithologists can provide essential records that, combined with climate date, can suggest predictions about the future impact of climate change in the Mediterranean basin.Peer reviewe

VARIOS AUTORES, Bibliografía crítica sobre la historia de la ciencia, la medicina y la tecnología de Aragón.

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Reactive nitrogen in the Spanish agri-food sector: environmental impact on atmosphere, soils, water and resources.

The presence of reactive species of nitrogen (N) in the biosphere might cause environmental impacts at local, regional and global scales. Nowadays the N flows generated by human activities greatly exceed natural processes, thus a necessity exists of identifying and quantifying the current state of environmental N loads. The aim of this work is to quantify the amount of reactive N used in the Spanish agri-food sector, assessing the related potential environmental impacts and potential uses of resources. Data from a previously calculated N flow analysis in the Spanish agricultural and food production system for the 1996-2000 time period were used. Total anthropogenic N inputs to the systems were calculated. Input and output flows were considered in each economic compartment in order to calculate use efficiency (ratio of useful outputs to total inputs), eco-efficiency (ratio of useful outputs to outputs to the environment) and recycling rate (ratio of flow recycled to an earlier life-cycle compartment divided by total outputs). Environmental impacts were assessed by quantifying the N balance between the economic and the environmental subsystems: water, atmosphere, ecosystems soils and other soils. In this case agricultural soils were also considered an environmental compartment, since they are an important intermediate path to the environment. The impact on resources was evaluated considering the net N imports into the system and legume fixing crops, pastures and forages versus feed and fertilizers within the system. Anthropogenic N inputs are relatively high in Spain, which is a net importer of nitrogen, mainly in fertilizers and food and feed commodities. Environmental compartments receive relative high amounts of reactive nitrogen, especially soils. Furthermore, there was a relative low use of domestic resources, with a low proportion of N recycled within the system

Un cambio climático que no existe: las precipitaciones en Madrid

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Los totales anuales de precipitaciones en Egipto y el "cambio climático"

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El macizo glacializado de El Barco de Avila (provincias de Avila - Cáceres)

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