Viscoelastic vibration damping identification methods. Application to laminated glass.

Laminatedglass is composed of two glass layers and a thin intermediate PVB layer, strongly influencing PVB's viscoelastic behaviour its dynamic response. While natural frequencies are relatively easily identified even with simplified FE models, damping ratios are not identified with such an ease. In order to determine to what extent external factors influence dampingidentification, different tests have been carried out. The external factors considered, apart from temperature, are accelerometers, connection cables and the effect of the glass layers. To analyse the influence of the accelerometers and their connection cables a laser measuring device was employed considering three possibilities: sample without instrumentation, sample with the accelerometers fixed and sample completely instrumented. When the sample is completely instrumented, accelerometer readings are also analysed. To take into consideration the effect of the glass layers, tests were realised both for laminatedglass and monolithic samples. This paper presents in depth data analysis of the different configurations and establishes criteria for data acquisition when testing laminatedglass

The influence of holes in the mechanical properties of EWT solar cells

EWT back contact solar cells are manufactured from very thin silicon wafers. These wafers are drilled by means of a laser process creating a matrix of tiny holes with a density of approximately 125 holes per square centimeter. Their influence in the stiffness and mechanical strength has been studied. To this end, both wafers with and without holes have been tested with the ring on ring test. Numerical simulations of the tests have been carried out through the Finite Element Method taking into account the non-linearities present in the tests. It's shown that one may use coarse meshes without holes to simulate the test and after that sub models are used for the estimation of the stress concentration around the holes

Predicting the single-proton/neutron potentials in asymmetric nuclear matter

We discuss the one-body potentials for protons and neutrons obtained from Dirac-Brueckner-Hartree-Fock calculations of neutron-rich matter, in particular their dependence upon the degree of proton/neutron asymmetry. The closely related symmetry potential is compared with empirical information from the isovector component of the nuclear optical potential.Comment: 9 pages, 6 figures. Minor revisions, added comments, reference

Recursos multimedia y protagonismo del rey Juan Carlos I Un análisis de ABC.es y ELPAÍS.com (2009 – 2011)*

A través de la multimedialidad los cibermedios pueden articular un lenguajemás flexible que el de los medios convencionales. En nuestro análisis decontenido, focalizado en las alusiones a Juan Carlos I durante 2009 y 2011,evaluamos tanto la integración de recursos multimedia en ABC.es y ELPAÍS.com, como el protagonismo concedido al rey de España en esos recursos.En los resultados destaca la elevada implementación audiovisual de lamonarquía: casi seis unidades de cada diez, en ABC.es, y casi ocho de cadadiez, en ELPAÍS.com, poseían algún tipo de recurso audiovisual. La conclusiónmás importante es la relativa al protagonismo: ambas cabeceras, a prioridistanciadas simbólicamente, denotan un patrón estructural semejante en lacaracterización del monarca, lo que evidencia la elevada direccionalidad delas informaciones descriptivas de la institución monárquica

Measurement of the Angular Dependence of the Dipole-Dipole Interaction Between Two Individual Rydberg Atoms at a F\"orster Resonance

We measure the angular dependence of the resonant dipole-dipole interaction between two individual Rydberg atoms with controlled relative positions. By applying a combination of static electric and magnetic fields on the atoms, we demonstrate the possibility to isolate a single interaction channel at a F\"orster resonance, that shows a well-defined angular dependence. We first identify spectroscopically the F\"orster resonance of choice and we then perform a direct measurement of the interaction strength between the two atoms as a function of the angle between the internuclear axis and the quantization axis. Our results show good agreement with the expected angular dependence $\propto(1-3\cos^2\theta)$, and represent an important step towards quantum state engineering in two-dimensional arrays of individual Rydberg atoms.Comment: 5 pages, 4 figure

No Upward Trend in Normalised Windstorm Losses in Europe: 1970-2008

On 18 January 2007, windstorm Kyrill battered Europe with hurricane-force winds killing 47 people and causing US$ 10 billion in damage. Kyrill poses several questions: is Kyrill an isolated or exceptional case? Have there been events costing as much in the past? This paper attempts to put Kyrill into an historical context by examining large historical windstorm event losses in Europe for the period 1970-2008 across 29 European countries. It asks the question what economic losses would these historical events cause if they were to recur under 2008 societal conditions? Loss data were sourced from reinsurance firms and augmented with historical reports, peer-reviewed articles and other ancillary sources. Following the same conceptual approach outlined in previous studies, the data were then adjusted for changes in population, wealth, and inflation at the country level and for inter-country price differences using purchasing power parity. The analyses reveal no trend in the normalised windstorm losses and confirm increasing disaster losses are driven by societal factors and increasing exposure.JRC.DDG.H.7-Land management and natural hazard

Presencia de aleteo nasal y frecuencia respiratoria alta en pacientes con disnea. Valoración enfermera en triage

Muchos pacientes acuden a Urgencias acusando disnea. El aleteo nasal forma parte de la musculatura accesoria de la respiración que se pone en marcha en situaciones de dificultad respiratoria. Recientemente han aparecido unos estudios en los que se relacionaba la presencia de aleteo nasal en los pacientes que presentaban disnea con una mayor gravedad de los mismos. Comprobar si es factible reconocer la presencia de aleteo nasal en pacientes con disnea y obtener el valor de la frecuencia respiratoria en estos pacientes, así como favorecer que estos datos sean recogidos por la enfermera en el triage. Comprobar la relación de estos datos, con los valores obtenidos en las gasometrías arteriales para poder relacionarlos con la gravedad de los pacientes. Se realizó una búsqueda bibliográfica para conocer todos los datos acerca de la relación entre el aleteo nasal, la frecuencia respiratoria y la gravedad de los pacientes. Además, se llevó a cabo un estudio prospectivo observacional. Se concluyó que los pacientes que presentaban disnea y aleteo nasal tenían una mayor necesidad de ingreso y tasa de mortalidad más elevada que los pacientes que solo presentaban disnea. Se observó también que los pacientes que presentaban una frecuencia respiratoria elevada también estaban más graves. Además, hubo una relación entre los factores anteriores, ya que los pacientes con aleteo nasal y disnea presentaban una frecuencia respiratoria más elevada y mostraban en los valores gasométricos más acidosis que los pacientes que solo presentaban disnea.Grado en Enfermerí