4,059 research outputs found
Microcavities coupled to multilevel atoms
A three-level atom in the -configuration coupled to a microcavity is
studied. The two transitions of the atom are assumed couple to different
counterpropagating mode pairs in the cavity. We analyze the dynamics both, in
the strong-coupling and the bad cavity limit. We find that compared to a
two-level setup, the third atomic state and the additional control field modes
crucially modify the system dynamics and enable more advanced control schemes.
All results are explained using appropriate dressed state and eigenmode
representations. As potential applications, we discuss optical switching and
turnstile operations and detection of particles close to the resonator surface.Comment: 14 pages, 9 figure
Moldels for reproducing the damage scenario of the Lorca earthquake
A damage scenario modelling is developed and compared with the damage distribution observed after the 2011 Lorca earthquake. The strong ground motion models considered include five modern ground motion prediction equations (GMPEs) amply used worldwide. Capacity and fragility curves from the Risk-UE project are utilized to model building vulnerability and expected damage. Damage estimates resulting from different combinations of GMPE and capacity/fragility curves are compared with the actual damage scenario, establishing the combination that best explains the observed damage distribution. In addition, some recommendations are proposed, including correction factors in fragility curves in order to reproduce in a better way the observed damage in masonry and reinforce concrete buildings. The lessons learned would contribute to improve the simulation of expected damages due to future earthquakes in Lorca or other regions in Spain with similar characteristics regarding attenuation and vulnerability
Analysis of urban parameters in the characterization of seismic vulnerability: application to the city of Lorca.
EstimaciĂłn de la intensidad tras el terremoto de Lorca
EvaluaciĂłn de la huella de carbono en el barrio de la viĂąa Lorca por rehabilitaciĂłn de daĂąos en edificios tras el sismo de 2011.
EvaluaciĂłn de la huella de carbono en el barrio de la viĂąa Lorca por rehabilitaciĂłn de daĂąos en edificios tras el sismo de 2011
EvaluaciĂłn de los modificadores por comportamiento urbanos que afectan al daĂąo en los terremotos. AplicaciĂłn al terremoto de Lorca.
Habitualmente, la estimaciĂłn de la vulnerabilidad sĂsmica se centra en el comportamiento estructural de los edificios. SĂłlo algunas metodologĂas, como el proyecto RiskâUE,consideran la influencia de otros factores no estructurales o urbanĂsticos, tales como el piso
blando, la irregularidad en alzado, la irregularidad en planta, etc. Estos factores,denominados tambiĂŠn modificadores por comportamiento, pueden tener una incidencia en el daĂąo observado, y la confluencia de varios de ellos puede variar sustancialmente la vulnerabilidad.
Los modificadores por comportamiento se han identificado de forma empĂrica, a travĂŠs de la observaciĂłn de patrones de daĂąo tĂpicos en terremotos, teniendo en cuenta las inspecciones visuales (ATC 21 1988, Benedetti y Petrini 1984, UNDP/UNIDO 1985) y otras propuestas
(Coburn y Spence 1992). La puntuaciĂłn del modificador ha sido dada por el conocimiento de expertos en terremotos tras analizar evaluaciones de vulnerabilidad anteriores y bases de datos del daĂąo producido en edificios.
En esta comunicaciĂłn estudiaremos los modificadores que derivan de caracterĂsticas urbanĂsticas. Esta lĂnea de investigaciĂłn considera que un parĂĄmetro modificador deriva de caracterĂsticas urbanĂsticas si puede ser regulado en la Normativa UrbanĂstica de un Plan General de OrdenaciĂłn Urbana. Se realiza una descripciĂłn de cada modificador segĂşn cada metodologĂa o investigador (RiskâUE, Giovinazzi, Lantada y Feriche) y una comparativa entre las distintas ponderaciones de los modificadores. Este anĂĄlisis nos permite poder tener una primera visiĂłn de la posible cuantificaciĂłn de cada modificador y la tendencia que ha
tenido la calibraciĂłn desde el aĂąo 2003 con el proyecto RiskâUE hasta el aĂąo 2012 con la tesis de Feriche.
Finalmente se presentan los resultados del estudio exploratorio de los parĂĄmetros urbanĂsticos de tres zonas seleccionados de la ciudad de Lorca segĂşn el tipo de suelo en el que se encuentren y se indican aquellos parĂĄmetros que han podido influir en el daĂąo provocado por el terremoto de mayo de 2011
Las tĂŠcnicas de MinerĂa de datos, ImĂĄgenes 3D, Sistemas de InformaciĂłn GeogrĂĄfica y EstadĂstica espacial aplicadas a la InnovaciĂłn Educativa [Techniques of Data Mining, 3D Images, Geographic Information Systems and Spatial Statistics applied to Educational Innovation ]
El objetivo de este artĂculo es analizar como las nuevas tecnologĂas: MinerĂa de datos, ImĂĄgenes 3D o Videos digitales, Sistemas de InformaciĂłn GeogrĂĄfica (datos georreferenciados) y EstadĂstica espacial, han cambiado y mejorado la InnovaciĂłn Educativa. Sin embargo, hay que destacar la âpoca presenciaâ de aplicaciĂłn de la EstadĂstica espacial en EspaĂąa en los trabajos de investigaciĂłn de InnovaciĂłn Educativa. El objetivo de este trabajo ha sido investigar las causas mĂĄs importantes de la no aplicaciĂłn de esta estadĂstica, detectĂĄndose que hay una falta de formaciĂłn en Secundaria y Bachillerato, asĂ como en la etapa universitaria, tanto en alumnos, como en profesores. Y por ello, se proponen soluciones para la mejora en la utilizaciĂłn y aplicabilidad de la EstadĂstica espacial en los trabajos de InnovaciĂłn Educativa en EspaĂąa.
[The aim of this work is to analyze how the new technologies: Data Mining, 3D Images or Digital Videos, Geographic Information Systems (georeferenced data) and Spatial Statistics, has changed and improved the current trends in Educational Innovation. Nevertheless, it is necessary to emphasize the "lack" of application of Spatial Statistics in Spanish researches focus on Educational Innovation. In this study the most important causes of non-application of this topic are investigated, and it has been detected an absence of this kind of education during Secondary and High School grades, which can also be extended university studies and affects both, students and teachers. Therefore, solutions are proposed for the improvement in the use and applicability of Spatial Statistics in the field of Educational Innovation in Spain.
Methodology for an effective risk assessment of urban areas: progress and first results of the merisur project
The progress and results the MERISUR, Methodology for an Effective RISk assessment of URban areas, are presented. This project aims at developing an effective methodology for urban seismic risk assessment that provides solutions to some deficiencies detected after recent damaging events worldwide, including risk mitigation actions based on benefit/cost ratios.
In a fisrt stage, the hazard and vulnerability models are developed and improved. A procedure to determine the hazard-controlling seismogenic fault, contsistent with different probability levels, is established. Methods to include active faults as individual sources and to consider near filed effects that significantly amplify ground motions are proposed.
A more complete description of seismic vulnerability encompassing structural, non-structural components is accomplished. Vulnerability modifiers to incorporate effects or urban parameters on vulnerability classes are also quantified.
A distinction is also made between damage to structural and non-structural building elements. For this purpose, a pushover analysis is specifically carried out to model building response and damage trends on non-structural elements. This gives the primary damage. In addition, the area covered by the resulting debris is also estimated both in inner spaces (within the building) and in the outer space (public roads and streets). In this way, a volume of debris will be associated to each area unit of the city, and the potential damage to persons and elements exposed, such as urban furniture and vehicles, will be assessed. This constitutes the secondary damage.
A static level of occupation (building, urban furniture, etc.) and a dynamic level of occupation (persons, vehicles) will be assigned to each area unit of the city, hereby defining the exposure in time and space.
Earthquake losses related to primary damage of building components and to secondary damage (such as urban furniture and vehicles) will be also assessed. Cost/benefit ratios between ex ante risk mitigation measurements will be developed in order to decide whether risk transfer or risk retention is preferable for different risk scenarios. This analysis will confer effectiveness to the results of a seismic risk study. Overall, the estimate of earthquake losses and cost/benefit ratios are topics with little presence in the scientific literature concerning damaging earthquakes in Spain. Thus, the results of this study will provide effective solutions to the challenge to society tackled in this proposal
Perspectives on the Trypanosoma cruzi-host cell receptor interaction
Chagas disease is caused by the parasite Trypanosoma cruzi. The critical initial event is the interaction of the trypomastigote form of the parasite with host receptors. This review highlights recent observations concerning these interactions. Some of the key receptors considered are those for thromboxane, bradykinin, and for the nerve growth factor TrKA. Other important receptors such as galectin-3, thrombospondin, and laminin are also discussed. Investigation into the molecular biology and cell biology of host receptors for T. cruzi may provide novel therapeutic targets
Search for the standard model Higgs boson in the H to ZZ to 2l 2nu channel in pp collisions at sqrt(s) = 7 TeV
A search for the standard model Higgs boson in the H to ZZ to 2l 2nu decay
channel, where l = e or mu, in pp collisions at a center-of-mass energy of 7
TeV is presented. The data were collected at the LHC, with the CMS detector,
and correspond to an integrated luminosity of 4.6 inverse femtobarns. No
significant excess is observed above the background expectation, and upper
limits are set on the Higgs boson production cross section. The presence of the
standard model Higgs boson with a mass in the 270-440 GeV range is excluded at
95% confidence level.Comment: Submitted to JHE
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