Imágenes de volcanes en la poesía de Quevedo: entre simbología, mitología y visiones paisajísticas

La producción poética quevediana —especialmente de tipo amoroso y laudatorio— muestra una evidente predilección del autor hacia la imagen del volcán en sus distintas variedades connotativas: simbólica, mitológica y de reevocación paisajística. El frecuente empleo de tal imagen (que en la poesía amorosa se relaciona casi sólo con la tópica antítesis petrarquista de nieve y fuego exasperada por la recurrente asociación al lexema venas, mientras que en los poemas encomiásticos es casi siempre el vehículo para la evocación del episodio mítico de la Gigantomaquia) y su amplificación expresiva encuentran su apropiada colocación en un contexto de experimentación poética que parece ajeno a la verdadera tradición petrarquista. Quevedo’s love and encomiastic poetry shows his interest in the employ of the volcano image in its symbolic, mythological and descriptive approaches. The frequent use of this image (usually associated with the snow-fire antithetical courteous topic in the love poetry and with the mythological giants defying the Olympus in the laudatory poetry) and its expressive amplification find their real placing in a poetic experimentation context detached from the true Petrarchist tradition

Solar cell radiation response near the interface of different atomic number materials

The response of cobalt 60 irradiated N/P silicon solar cells was measured as a function of the atomic number of the medium adjacent to the cell and the direction of the gamma ray beam. The interpositioning of various thicknesses of aluminum between the adjacent material and the cell had the effect of moving the cell to various locations in an approximate monatomic numbered medium. Using this technique the solar cell response was determined at various distances from the interface for gold and beryllium. The results were compared with predictions based upon ionization chamber measurements of dose perturbations in aluminum and found to agree within five percent. Ionization chamber data was then used to estimate the influence of various base contact materials

Infrared Behaviour of Massless Integrable Flows entering the Minimal Models from phi_31

It is known that any minimal model M_p receives along its phi_31 irrelevant direction *two* massless integrable flows: one from M_{p+1} perturbed by phi_{13}, the other from Z_{p-1} parafermionic model perturbed by its generating parafermion field. By comparing Thermodynamic Bethe Ansatz data and ``predictions'' of infrared Conformal Perturbation Theory we show that these two flows are received by M_p with opposite coupling constants of the phi_31 irrelevant perturbation. Some comments on the massless S matrices of these two flows are added.Comment: 12 pages, Latex - One misprinted (uninfluent) coefficient corrected in Tab.

Co-digestion of macroalgae for biogas production: an LCA-based environmental evaluation

Algae represent a favourable and potentially sustainable source of biomass for bioenergy-based industrial pathways in the future. The study, performed on a real pilot plant implemented in Augusta (Italy) within the frame of the BioWALK4Biofuels project, aims to figure out whether seaweed (macroalgae) cultivated in near-shore open ponds could be considered a beneficial aspect as a source of biomass for biogas production within the co-digestion with local agricultural biological waste. The LCA results confirm that the analysed A and B scenarios (namely the algae-based co-digestion scenario and agricultural mix feedstock scenario) present an environmental performance more favourable than that achieved with conventional non-renewable-based technologies (specifically natural gas - Scenario C). Results show that the use of seaweed (Scenario A) represent a feasible solution in order to replace classical biomass used for biofuel production from a land-based feedstock. The improvement of the environmental performances is quantifiable on 10% respect to Scenario B, and 38 times higher than Scenario

A note on the topological order of noncommutative Hall fluids

We evaluate the ground state degeneracy of noncommutative Chern-Simons models on the two-torus, a quantity that is interpreted as the "topological order" of associated phases of Hall fluids. We define the noncommutative theory via T-duality from an ordinary Chern-Simons model with non-abelian 't Hooft magnetic fluxes. Motivated by this T-duality, we propose a discrete family of noncommutative, non-abelian fluid models, arising as a natural generalization of the standard noncommutative Chern-Simons effective models. We compute the topological order for these universality classes, and comment on their possible microscopic interpretation.Comment: 14 page

Tests for C-theorems in 4D

A proof for a non-perturbative C-theorem in four dimensions, capturing the irreversibility of the renormalization group flow in the space of unitary quantum field theories, has not been accomplished, yet. We test the conjectured C-theorems using the exact results recently obtained in N=1 supersymmetric gauge theories. We find that the flow towards the infrared region is consistent with the main proposals for a C-theorem.Comment: 10 pages, 2 figures, uses harvmac.tex, tables.tex, epsf.te

't Hooft Anomaly Matching Conditions for Generalized Symmetries in 2D

The 't Hooft anomaly matching conditions are a standard tool to study and test non-perturbative issues in quantum field theory. We give a new, simple proof of the anomaly matching conditions in 2D Poincare` invariant theories. We consider the case of invariance under a large class of generalized symmetries, which include abelian and non-abelian internal symmetries, space-time symmetries generated by the stress tensor, and W-type of symmetries generated by higher spin currents.Comment: 10 pages, TeX, corrected minor misprints in text and reference

Effect of some disease stress on cow milk yield and features

In their review, Bertoni et al. (2003) have pointed out how in dairy cows milk yield and its characteristics are markedly modified during disease stress (general consequences of any disease). This mainly depends on secretion of cytokines, which determines anorexia, endocrine changes and diversion of some nutrients toward the immune system