High pressure effects in fluorinated HgBa2Ca2Cu3O(8+d)

We have measured the pressure sensitivity of Tc in fluorinated HgBa2Ca2Cu3O(8+d) (Hg-1223) ceramic samples with different F contents, applying pressures up to 30 GPa. We obtained that Tc increases with increasing pressure, reaching different maximum values, depending on the F doping level, and decreases for a further increase of pressure. A new high Tc record (166 K +/- 1 K) was achieved by applying pressure (23 GPa) in a fluorinated Hg-1223 sample near the optimum doping level. Our results show that all our samples are at the optimal doping, and that fluorine incorporation decreases the crystallographic $a$-parameter concomitantly increasing the maximum attainable Tc. This effect reveals that the compression of the $a$ axes is one of the keys that controls the Tc of high temperature superconductors.Comment: 4 pages, 4 figures, submitted to Phys. Rev.

Quevedo y la traducción bíblica: tradiciones y contextos. (En torno al Cantar de los cantares )

A partir de la traducción compuesta llevada acabo en la paráfrasis del Cantar de los Cantares (Blecua, 198), a través de las traducciones previas de Arias Montano y fray Luis de León, se puede apreciar en Quevedo la permanencia de una «poética bíblica» que mantiene unas características comunes desde los inicios de su etapa filológica (hacia 1613), principalmente en el Jeremías, hasta sus reflexiones en torno al Santo Job (1641). Taking as a starting point the compound translation accomplished in the paraphrase of The Song of Songs from the previous translations by Arias Montano and Brother Luis de León, the persistence of a sort of «biblical poetics» can be perceived in Quevedo. This «biblical poetics» keeps similar characteristics to those found in Quevedo’s philological phase (around 1613), especially in his Jeremías, up to his considerations on Saint Job (1641)

Evidence of coupling between the thermal and nonthermal emission in the gamma-ray binary LS I +61 303

The gamma-ray binary LS I +61 303 is composed of a Be star and a compact companion orbiting in an eccentric orbit. Variable flux modulated with the orbital period of ~26.5 d has been detected from radio to very high-energy gamma rays. In addition, the system presents a superorbital variability of the phase and amplitude of the radio outburst with a period of ~4.6 yr. We present optical photometric observations of LS I +61 303 spanning ~1.5 yr and contemporaneous Halpha equivalent width (EW Halpha) data. The optical photometry shows, for the first time, that the known orbital modulation suffers a positive orbital phase shift and an increase in flux for data obtained 1-yr apart. This behavior is similar to that already known at radio wavelengths, indicating that the optical flux follows the superorbital variability as well. The orbital modulation of the EW Halpha presents the already known superorbital flux variability but shows, also for the first time, a positive orbital phase shift. In addition, the optical photometry exhibits a lag of ~0.1-0.2 in orbital phase with respect to the EW Halpha measurements at similar superorbital phases, and presents a lag of ~0.1 and ~0.3 orbital phases with respect noncontemperaneous radio and X-ray outbursts, respectively. The phase shifts detected in the orbital modulation of thermal indicators, such as the optical flux and the EW Halpha, are in line with the observed behavior for nonthermal indicators, such as X-ray or radio emission. This shows that there is a strong coupling between the thermal and nonthermal emission processes in the gamma-ray binary LS I +61 303. The orbital phase lag between the optical flux and the EW Halpha is naturally explained considering different emitting regions in the circumstellar disk, whereas the secular evolution might be caused by the presence of a moving one-armed spiral density wave in the disk.Comment: 4 pages, 3 figures, accepted for publication in A&A (this version matches the published version

Teaching about the Muxes in the United States: Cultural Construct Gender Identity, and Transgression in the 21st Century

This study focuses on the manner in which gender identities challenge heteronormativity and are understood as a way to interpret the sexed body through culture in the documentary Muxes: auténticas, intrépidas, buscadoras del peligro (2005), directed by Mexican filmmaker Alejandra Islas Caro. In the context of a Gender Issues in Latin America course taught in a North American university, we explored how certain theories by thinkers such as Simone de Beauvoir, Pierre Bourdieu, and Judith Butler, among others, contend that sexual preference, gender orientation, and sexuality, can be built as a cultural constructs, contrary to popular beliefs on the subject. Some of the students found that those theories conflicted with preconceptions that they brought into the classroom. The documentary shows the everyday experiences of the “muxes,” a group of homosexual, cross-dressing, and transsexual persons who live their identities through a series of performative acts in the town of Juchitán. In doing so, they transgress the traditional roles and expectations that a patriarchal society has for both their men and women. Furthermore, their actions are presented in the film as everyday acts of defiance towards heteronormative patterns—that is, manners of interpreting the sexed body that have come to be considered acceptable by patriarchal societies. Islas Caro’s documentary allowed students to transcend the apparent dualities (i.e. man/woman, masculine/feminine; heterosexual/homosexual, etc.) that it is so commonly associated with this field of study. In addition, discussion and activities showed that students were better able to understand the theories that had been previously discussed in class, with special attention to the notions of sex, gender, and sexuality as social constructions

Coulomb integrals for the SL(2,R) WZNW model

We review the Coulomb gas computation of three-point functions in the SL(2,R) WZNW model and obtain explicit expressions for generic states. These amplitudes have been computed in the past by this and other methods but the analytic continuation in the number of screening charges required by the Coulomb gas formalism had only been performed in particular cases. After showing that ghost contributions to the correlators can be generally expressed in terms of Schur polynomials we solve Aomoto integrals in the complex plane, a new set of multiple integrals of Dotsenko-Fateev type. We then make use of monodromy invariance to analytically continue the number of screening operators and prove that this procedure gives results in complete agreement with the amplitudes obtained from the bootstrap approach. We also compute a four-point function involving a spectral flow operator and we verify that it leads to the one unit spectral flow three-point function according to a prescription previously proposed in the literature. In addition, we present an alternative method to obtain spectral flow non-conserving n-point functions through well defined operators and we prove that it reproduces the exact correlators for n=3. Independence of the result on the insertion points of these operators suggests that it is possible to violate winding number conservation modifying the background charge.Comment: Improved presentation. New section on spectral flow violating correlators and computation of a four-point functio

Comportamiento fitocenológico de Alliaria Petiolata (M. Bieb.) Caravaca & Grande en el sur de la Península Ibérica

Alliaria petiolata es una especie ampliamente distribuída por el norte de la Península Ibérica y que se enrarece hacia el sur, localizándose entonces en biotopos submediterráneos, generalmente escasos en Andalucía. En este trabajo se aborda el estudio fi tocenológico (fi tosociológico) de A. petiolata en el sur de Andalucía (Málaga y zonas limítrofes). En la provincia de Málaga, A. petiolata aparece en comunidades de pastizal escionitrófi lo bajo bosques como pinsapares (Abies pinsapo), robledales (Quercus pyrenaica) y acerales (Acer monspessulanum). Entre los resultados, se describe una nueva subasociación (Urtico dubiae-Smyrnietum olusatri subass. ranunculetosum blepharicarpi nova) propia hasta el momento del subsector Torcalense (sector Antequerano, provincia Bética, subregión Mediterránea Occidental), caracterizada precisamente por la presencia de A. petiolata. Además se estudia la presencia de esta especie en otras dos asociaciones de pastizales escionitrófi los distribuidos por Andalucía.Alliaria petiolata is widely distributed in the Northern Iberian Peninsula but becomes rare in the south where it appears only in sub-Mediterranean favourable biotopes which are generally scarce in Andalusia. In this paper we deal with the phytosociological study of A. petiolata in southern Andalusia (Malaga province and surroundings). In Malaga province A. petiolata occurs in sciophilous-nitrophilous herbs communities under covering of Abies pinsapo, Quercus pyrenaica or Acer monspessulanum. As a result a new association (Urtico dubiae-Smyrnietum olusatri subass. ranunculetosum blepharicarpi nova) is described from Torcal de Antequera (Antequerano sector, Baetic province, Western Mediterranean subregion), characterised by A. petiolata. Moreover, we have studied the presence of Alliaria in another two sciophilous-nitrophilous associations spread out in Andalusia

Sobre las avellanedas subbéticas con Ulmus Glabra Huds. en las sierras de Cazorla-Segura-Alcaraz, Jaén-Albacete (España)

Se aportan nuevos datos fitosociológicos y florísticos sobre las avellanedas (Geo urbani-Coryletum avellanae) del sector fitogeográfico Subbético (provincia Bética, región Mediterránea). La ubicación de esta asociación edafohidrófila en biotopos con suelos permanentemente húmedos, como es el caso de profundas vaguadas o cañones orientados al norte y con condiciones microclimáticas excepcionales (submediterráneas), posibilita la aparición en el seno de esta comunidad de taxones típicamente eurosiberianos con distribución límite en el sur de España; tal es el caso de Ulmus glabra, Carex sylvatica subsp. sylvatica o Moehringia trinervia. Se defi ne en el seno de esta comunidad una nueva subasociación (Geo urbani-Coryletum avellanae ulmetosum glabrae subass. nova) vinculada con Corylo-Populion, Tilio-Acerion y Fagetalia por la afi nidad fi tosociológica de algunas especies destacables y compartiendo varios taxones con las avellanedas del Sistema Ibérico (Astrantio-Coryletum avellanae). Esta subasociación también representa zonas muy bien conservadas, con especies muy escasas, amenazadas o legalmente protegidas. Se define también otra nueva subasociación en este caso en el seno del aceral bético (Daphno latifoliae-Aceretum granatensis coryletosum avellanae subass. nova) cuyo significado fitogeográfico corresponde al empobrecimiento progresivo de las avellanedas en táxones de Tilio-Acerion, Fagetalia y los más restringidos de Querco-Fagetea al desplazarnos hacia el suroeste en el sector Subbético (subsector Cazorlense), refugiándose el resto de su cortejo florístico en los acerales béticos.New phytosociological and floristic data about hazel forests (Geo urbaniCoryletum avellanae) endemic of the Subbético phytogeographical sector (Bética province, Mediterranean region) are presented. This edaphohygrophilous association develops on the permanently wet soils of the deep ravines and canyons with north exposition and exceptional microclimatic characteristics (submediterranean) of the Subbético supramediterranean bioclimatic belt. These conditions enable Eurosiberian species, very unusual and rare in southern Spain, to appear inside this community: Ulmus glabra, Carex sylvatica subsp. sylvatica or Moehringia trinervia. To point out this kind of vegetation we propose a new subassociation: Geo urbani-Coryletum avellanae ulmetosum glabrae subass. nova, related to Corylo-Populion, Tilio-Acerion and Fagetalia and connected with the hazel forests, Astrantio-Coryletum avellanae, found in the Oroibérica subprovince (Iberian range). The new subassociation represents biotopes inside this plant ecosystem very well preserved. We also propose a new subassociation inside the maple tree forests of the Subbético sector (Daphno latifoliae-Aceretum granatensis coryletosum avellanae subass. nova). We interpreted this syntaxa as an impoverishment of the hazel forests in taxa of Tilio-Acerion, Fagetalia and Querco-Fagetea to the southwest of the Subbético sector, taking refuge its more resistant taxa inside Aceri-Quercion forests

Quality Evaluation of Parmigiano Reggiano Cheese by a Novel Nanowire Device S3 and Evaluation of the VOCs Profile

Abstract A novel nanowire-based sensor device is presented for the quality evaluation of the Italian Parmigiano Reggiano (PR) cheese. As a Protected Designation of Origin (PDO) trademark product, the cheese should follow stringent manufacturing guidelines and must exhibit the representative aromatic volatile organic compounds (VOCs) biomarkers and sensory profile. Any alteration in these features indicates an adulteration of the product as many low quality and substandard PR cheeses are widely available in the market. Different types of grated cheese samples were analyzed and the VOCs were characterized by evaluating the samples with the portable sensor device S3 and Gas Chromatography–Mass Spectrometry technique. The ability of S3 device to distinguish the cheese quality demonstrates its suitability for monitoring the quality control and authenticity of PR cheese