Memory effect in triglycine sulfate induced by a transverse electric field: specific heat measurement

The influence of a transverse electric field in the specific heat of triglycine sulphate (TGS) has been studied. The specific heat of TGS has been measured heating the sample from ferroelectric to paraelectric phase after prolonged transverse electric field (i.e. perpendicular to the ferroelectric axis). It is shown that the specific heat of TGS can remember the temperature $T_s$ at which the transverse field was previously applied.Comment: ReVTeX4 Twocolumn 4 pages, 4 figure

Climate simulations of large scale conditions associated with the genesis of medicanes

Póster elaborado para la European Conference on Severe Storms celebrada en Palma de Mallorca del 3 al 7 de octubre de 2011Project Medicanes (GCL2008-01271/CLI) from Ministerio de Ciencia e Innovación (Spain)

Diagnosis of bronchial hyperresponsiveness in sport by PC20 value

En este trabajo se exponen los criterios de positividad del Comité Olímpico Internacional versus a la Sociedad Española de Neumología y Cirugía Torácica. Participaron en este estudio ochenta deportistas de alto rendimiento, realizando una historia clínica, una espirometría de reposo y un test de metacolina. Se analiza la sensibilidad y especificidad del test de metacolina mediante curvas ROC. El comité Internacional antidopaje (WADA) requiere que la disminución sea con un PC20 < a 4mg/ml, mientras que para la práctica clínica este descenso debe presentar un PC20 < 8mg/ml. Los resultados fueron: 25% tuvieron un PC20 > de 8mg/ml; el 61% obtuvieron un PC20 < 4mg/ml y un 14% presentaron un PC20 entre 4 y 8mg/ml, correspondiendo el mejor punto de corte a PC20 de 7,6mg/ml con especificidad de 98,3 y sensibilidad de 100%. Se tendría que determinar los mismos criterios para el diagnóstico de los deportistas y los que no lo son.In this work criteria of the International Olympic Committee versus the Spanish Society of Pneumology and Thoracic Surgery are exposed. A study was conducted in eighty high performance athletes of several sports . Who underwent a medical history, resting spirometry and a methacholine challenge test. You get the sensitivity and specificity of methacholine challenge test using Receiver Operating Curves (ROC curves). International anti-doping Committee requires that the decline is a PC20 < 4mg/ml, while clinical practice this fall must submit a PC20 < 8mg/ml. Twenty five percent of those studied had a PC20 > of 8mg/ml, 61% had a PC20 < 4mg/ml and 14% had a 4 to 8mg/ml PC20. The best cutoff point was found for a PC20 of 7.6 mg/ml with a specificity of 98.3 and a sensitivity of 100%. It would have to determine the same criteria for positive diagnosis of athletes and those who are not

Native-immigrant Working Conditions in the European Labor Market

The aim of this paper is to explore the immigrant, first generation immigrant descendants, and native populations in the European Union context. Using a logistic regression model, it is evaluated the working conditions that characterize these group of individuals compared to each other

El Instituto Torroja a lo largo de su historia y la investigación en materiales vítreos y cerámicos

Publicado en: Boletín de la Sociedad Española de Cerámica y Vidrio, 44(2): 131-134 (2005).[ES] El Instituto de Ciencias de la Construcción Eduardo Torroja (IETcc) desde su fundación no sólo ha realizado a lo largo de su ya larga historia investigaciones y valiosas aportaciones científicas y técnicas en el campo de los materiales cerámicos y vidrios, sino que además fue uno de los principales fundadores de la actual Sociedad Española de Cerámica y Vidrio (SECV) con la destacada participación de D. Francisco Arredondo y Verdú. En los últimos once años esta línea de investigación se ha visto reforzada con la creación del Grupo y Laboratorio de Materiales Vítreos y Cerámicos, por lo que se realiza una revisión de la relación de este centro con este tipo de materiales, recordándose los investigadores y publicaciones que más destacaron en este campo. Se realiza finalmente un análisis de la situación actual y de las perspectivas de I+D+i en este tipo de materiales de construcción, haciendo especial énfasis en sus aplicaciones en fachadas ventiladas y del factor dinamizador de la investigación científica que implicará el reto tecnológico de la aplicación de plaquetas cerámicas en este tipo de fachadas.[EN] Ever since its inception and throughout its history, the Eduardo Torroja Institute for Construction Science of the CSIC (IETcc, CSIC) has conducted research in and made valuable scientific and technical contributions to the area of ceramic and glassy materials, and played a key role in the founding of the present Spanish Ceramic and Glass Society (SECV), under the leadership of Francisco Arredondo y Verdú. The creation in recent years of the Glassy and Ceramic Materials Group and Laboratory has reinforced this line of research. The present paper reviews the effort deployed by the Institute in connection with this type of materials, with a tribute to some of the most prominent publications in the field and their authors. Finally, it has been carried out a discussion of the nowadays situation and future prospects onf R+D+I in this type of construction materials, giving emphasis into the uses in vent façades, as well as the dynamic factor over the scientific research implied from the technological challenge of ceramic tiles in this constructive systems.Peer reviewe

Formation of asymmetric arms in barred galaxies

ABSTRACTWe establish a dynamical mechanism to explain the origin of the asymmetry between the arms observed in some barred disc galaxies, where one of the two arms emanating from the bar ends is very well defined, while the second one displays a ragged structure, extending between its ridge and the bar. To this purpose, we study the invariant manifolds associated with the Lyapunov periodic orbits around the unstable equilibrium points at the ends of the bar. Matter from the galaxy centre is transported along these manifolds to the periphery, forming this way the spiral arms that emanate from the bar ends. If the mass distribution in the galaxy centre is not homogeneous, because of an asymmetric bar with one side stronger than the other, or because of a non-centred bulge, the dynamics about the two unstable Lagrange points at the ends of the bar will not be symmetric as well. One of their invariant manifolds becomes more extended than the other, enclosing a smaller section and the escaping orbits on it are fewer and dispersed in a wider region. The result is a weaker arm and more ragged than the one at the other end of the bar