Crucifixión y criogenización en la postfotografía contemporánea: el cuerpo suspendido, lacerado y expuesto

Actas de las Segundas Jornadas Imagen, Cultura y Tecnología celebradas entre el 1 y el 3 de julio de 2003 en la Universidad Carlos III de MadridPublicad

Universal Indexes for Highly Repetitive Document Collections

Indexing highly repetitive collections has become a relevant problem with the emergence of large repositories of versioned documents, among other applications. These collections may reach huge sizes, but are formed mostly of documents that are near-copies of others. Traditional techniques for indexing these collections fail to properly exploit their regularities in order to reduce space. We introduce new techniques for compressing inverted indexes that exploit this near-copy regularity. They are based on run-length, Lempel-Ziv, or grammar compression of the differential inverted lists, instead of the usual practice of gap-encoding them. We show that, in this highly repetitive setting, our compression methods significantly reduce the space obtained with classical techniques, at the price of moderate slowdowns. Moreover, our best methods are universal, that is, they do not need to know the versioning structure of the collection, nor that a clear versioning structure even exists. We also introduce compressed self-indexes in the comparison. These are designed for general strings (not only natural language texts) and represent the text collection plus the index structure (not an inverted index) in integrated form. We show that these techniques can compress much further, using a small fraction of the space required by our new inverted indexes. Yet, they are orders of magnitude slower.Comment: This research has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sk{\l}odowska-Curie Actions H2020-MSCA-RISE-2015 BIRDS GA No. 69094

Experimental determination of the resistivity limits for platinum and iron metal gases using an exploding wire

Transport properties of metals in solid, liquid, gas or plasma phases are an open area of research, both theoretically and experimentally. Concretely, there are no measurements available for the resistivity of gas phase of metals. In the latter case, the use of exploding wire systems allows one to reach states from solid to plasma that are not accessible with other experimental methods. In this work, following a measurement method previously used with copper, experimental resistivity limits of iron and platinum metal gases are presented based on measurements performed on the metal gas expansion phase.Fil: Bilbao, Luis Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física del Plasma. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física del Plasma; ArgentinaFil: Rodríguez Prieto, Gonzalo. Universidad de Castilla-La Mancha; Españ

First experimental values for the light penetration depth of platinum and iron gases at 532 nm

Light penetration depth is a fundamental property that has been researched extensively with a large amount of materials. Among those studies, different planetary atmospheres and material phases, like plasmas, had been previously addressed, both theoretically and experimentally. However, no experimental data are available for platinum and iron gases due to the difficulties for the creation of gas state from a solid metal material. This work present experimental penetration depths at 532 nm laser light for iron and platinum gases produced by a carefully tuned exploding wire system in atmospheric air. Iron presents a larger dispersion on the data than platinum, which is explained because of its large magnetic permeability value, that generates a less homogeneous gas than in the platinum case.Fil: Prieto, Gonzalo Rodríguez. Universidad de Castilla-La Mancha; EspañaFil: Bilbao, Luis Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física del Plasma. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física del Plasma; Argentin

FIB-SEM tomography in catalysis and electrochemistry

[EN] Tomographic imaging methods have been incorporated, mostly from other scientific disciplines, into catalysis research. They are invaluable tools for the structural diagnostics of solid catalyst and electrode materials, which uniquely provide information on notions of spatial character which remain out of reach for conventional singleprojection, i.e. 2D, microscopy methods. Focused-Ion-Beam Scanning-Electron-Microscopy (FIB-SEM) tomography is a destructive, slicing-type tomographic method which offers spatial resolutions down to few nm for inspection volumes up to several tens of mu m across. As such, it has attracted a significant deal of attention as a means to study mesoscale features and macropore networks in catalytic materials. In this review, we first provide a succinct account on the recent technical developments in dual-beam technologies and discuss their implications for tomographic imaging experiments. Next, an exemplary experimental workflow for FIB-SEM experiments is discussed, with emphasis on technical aspects which concern specifically work with highly porous, electrically insulating catalyst materials. Contributions of FIB-SEM tomography to the quantification of mass transportrelevant topological parameters in porous catalysts, and multiple-phase boundaries of significance for concomitant mass and charge transport phenomena in electrode materials are surveyed. The application of FIBSEM tomography for the analysis and rational development of materials in catalysis and electrochemistry has seen a fast surge over the last decade. It promises to continue consolidating as an important diagnostic tool for meso- and nano-spatial structural features, e.g. in multi-functional composite catalyst materials, wherein the relative spatial location of different sub-materials/functionalities are determinant for performance.Authors acknowledge funding from the European Research Council (ERC-2019-COG 864195, TANDEng) . Staff members at the Electron Microscopy Service unit of the UPV are gratefully acknowledged for equipment maintenance and technical assistance.Ródenas Torralba, T.; Prieto González, G. (2022). FIB-SEM tomography in catalysis and electrochemistry. Catalysis Today. 405:2-13. https://doi.org/10.1016/j.cattod.2022.09.01321340

Electrical behavior of exploding copper wire in ambient air

This work experimentally investigates the electrical behavior of an exploding wire when the initial energy of the system varies from 28 to 709 J. This experiment uses 50-um-diameter, 33-mm-long copper wires. The wire is surrounded by air at normal atmospheric pressure and temperature. The experiment monitored the current derivative, voltage between wire ends, total visible radiation emitted, and the shadow image of the wire to study how the electrical parameters vary as a function of initial energy. The results indicate a change in the initial discharge mechanism.Fil: Barbaglia, Mario Oscar. Universidad Nacional del Centro de la Provincia de Buenos Aires. Centro de Investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires. - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil. Centro de Investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires. - Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires; Argentina. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Exactas. Instituto de Física Arroyo Seco; ArgentinaFil: Rodriguez Prieto, Gonzalo. Universidad de Castilla-La Mancha; Españ

Bayesian joint spatio-temporal analysis of multiple diseases

In this paper we propose a Bayesian hierarchical spatio-temporal model for the joint analysis of multiple diseases which includes specific and shared spatial and temporal effects. Dependence on shared terms is controlled by disease-specific weights so that their posterior distribution can be used to identify diseases with similar spatial and temporal patterns. The model proposed here has been used to study three different causes of death (oral cavity, esophagus and stomach cancer) in Spain at the province level. Shared and specific spatial and temporal effects have been estimated and mapped in order to study similarities and differences among these causes. Furthermore, estimates using Markov chain Monte Carlo and the integrated nested Laplace approximation are compared.Peer Reviewe