5,407 research outputs found

    Caracterização do património geomorfológico do Parque Natural do Douro Internacional (NE de Portugal) com vista à sua valorização

    Get PDF
    O Parque Natural do Douro Internacional (PNDI) é uma área protegida pertencente à Rede Nacional de Áreas Protegidas, sob a alçada do Instituto da Conservação da Natureza e da Biodiversidade. O Parque localiza-se no nordeste transmontano, numa área de 851 km2, que acompanha longitudinalmente os rios Douro e Águeda, através de um troço fronteiriço e ao longo de 130 km. Os vales do tipo canhão fluvial com as sua vertentes abruptas, as arribas, destacam-se entre outras geoformas no PNDI. O presente trabalho visa caracterizar e quanti!car a relevância do Património Geomorfológico, inserido no riquíssimo Património Geológico existente na área, bem como a apresentação de propostas de valorização. Foi feita a caracterização dos geomorfossítios inventariados no âmbito dum projecto anterior, tendo-se concluído que os aspectos de maior importância da paisagem do PNDI são o Planalto Mirandês, os relevos residuais, as geoformas graníticas e os vales profundos do rio Douro e afluentes. De seguida, procedeu-se à quantificação da relevância, utilizando uma adaptação dos métodos propostos por Cendrero (2000) e Brilha (2005) para o Património Geológico, obtendo-se uma seriação dos geomorfossítios quanti!cados, o que permite concluir quais os locais com maior potencial para valorização e divulgação. Para a valorização destes geomorfossítios propõem-se várias estratégias como a implementação de painéis interpretativos temáticos, inseridos num percurso rodoviário com o tema “Rota das Arribas”, passando pelos miradouros mais emblemáticos dos rios Douro e Águeda. O Património Geomorfológico do PNDI é um dos ex-libris do Parque, pelo que deverá ser valorizado, constituindo uma importante valência para o impulso do geoturismo na região.The International Douro Natural Park (IDNP) is a protected area that belongs to the Protected Areas National Network, managed by the Nature and Biodiversity Conservation Institute. It is located in northeastern Portugal, with an area of 851 km2. The Park follows the Douro and Águeda rivers, through the border with Spain, along 130 km. The fluvial canyons and cliffs associated with these rivers are important landscape elements in the IDNP. The present work intends to characterize and quantify the relevance of Geomorphological Heritage, inserted in the rich Geological Heritage of this area, as also to present valorization strategies. A characterization of potential geomorphosites identified in a previous project was developed, which highlights the most important elements of the IDNP landscape, namely the Miranda Plain, residual reliefs, granitic landforms and deep valleys of the Douro and the Águeda rivers. A quantitative assessment was also applied, based on a modified version of the models proposed by Cendrero (2000) and Brilha (2005) for the Geological Heritage. A final ranking of the geomorphosites was proposed which establishes the valuable sites that must be included in conservation strategies or selected for geotourism and educational programs. Several strategies were proposed to value these geomorphosites, such as thematic interpretative panels and a car route, the “Arribas Route”, joining the most important viewpoints of the Douro and the Águeda rivers. The Geomorphological Heritage of the IDNP is an ex-libris of this Natural Park. It must be recognized, valued and considered as a major contribution to the geotourism in the region

    SelEQ: a web-based application for the selection of earthquake ground motions for structural analysis

    Get PDF
    Given the continuous development and availability of strong-motion databases containing real accelerograms, the consideration of such information in nonlinear structural analysis becomes increasingly attractive. However, the selection of records to adopt in structural analysis requires not only the consideration of consistent selection criteria but also the availability of computational tools that allow for fast and efficient searches of earthquake records within such databases. In this context, and following the recent advances in internet-based technologies, the present paper introduces SelEQ, a web-based application for the search and selection of earthquake records. This tool incorporates a number of filtering procedures allowing for the search of seismic records based on geophysical data but also on more advanced criteria such as spectral shape matching. Furthermore, SelEQ allows also the selection of earthquake records according to current seismic design code requirements, such as those of Eurocode 8, which demand for record suites compatible with a given response spectrum

    Gamma-hydroxybutyric acid endogenous production and post-mortem behaviour – The importance of different biological matrices, cut-off reference values, sample collection and storage conditions

    Get PDF
    Gamma-Hydroxybutyric Acid (GHB) is an endogenous compound with a story of clinical use, since the 1960's. However, due to its secondary effects, it has become a controlled substance, entering the illicit market for recreational and “dance club scene” use, muscle enhancement purposes and drug-facilitated sexual assaults. Its endogenous context can bring some difficulties when interpreting, in a forensic context, the analytical values achieved in biological samples. This manuscript reviewed several crucial aspects related to GHB forensic toxicology evaluation, such as its post-mortem behaviour in biological samples; endogenous production values, whether in in vivo and in post-mortem samples; sampling and storage conditions (including stability tests); and cut-off reference values evaluation for different biological samples, such as whole blood, plasma, serum, urine, saliva, bile, vitreous humour and hair. This revision highlights the need of specific sampling care, storage conditions, and cut-off reference values interpretation in different biological samples, essential for proper practical application in forensic toxicology.info:eu-repo/semantics/acceptedVersio

    Doryctopambolus nunes & Zaldívar-Riverón (Braconidae), a new Neotropical doryctine wasp genus with propodeal spines

    Get PDF
    The new Neotropical doryctine genus Doryctopambolus gen. n. is erected to contain D. pilcomayensis (van Achterberg & Braet, 2004), comb. n., which was previously placed within Pambolus (Pambolinae), as well as three new species, D. clebschi sp. n., D. dominicanus sp. n. and D. sarochensis sp. n. Membersof this new genus are mainly characterised by the presence of at least one pair of conspicuous propodeal apico-lateral projections, which are similar to those present in all members of Pambolinae and in species of three Australasian doryctine genera. We generated DNA barcoding sequences for the three newly described species. We discuss the morphological similarity between species of the Australasian Echinodoryctes Belokobylskij, Iqbal & Austin and Doryctopambolus. A key for the described species of Doryctopambolus is provided.Fil: Nunes, Juliano Fiorelini. Universidade Federal de Minas Gerais; BrasilFil: Zaldívar Riverón, Alejandro. Universidad Nacional Autónoma de México; MéxicoFil: de Castro, Clóvis Sormus. Universidade Federal do São Carlos; BrasilFil: Marsh, Paul M.. No especifica;Fil: Penteado Dias, Angélica Maria. Universidade Federal do São Carlos; BrasilFil: Briceño, Rosa. Universidad Centroccidental Lissandro Alvarado; VenezuelaFil: Martinez, Juan Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”; Argentin

    MIAWARE Software:3D Medical Image Analysis with Automated Reporting Engine and Ontology-based Search

    Get PDF
    which was designed and developed for doctor/radiologist assistance. It allows to analyze an image stack from computed axial tomography scan of lungs (thorax) and, at the same time, to mark all pathologies on images and report their characteristics. The reporting process is normalized- radiologists cannot describe pathological changes with their own words, but can only use some terms from a specific vocabulary set provided by the software. Consequently, a normalized radiological report is automatically generated. Furthermore, MIAWARE software is accompanied with an intelligent search engine for medical reports, based on the relations between parts of the lungs. A logical structure of the lungs is introduced to the search algorithm through the specially developed ontology. As a result, a deductive report search was obtained, which may be helpful for doctors while diagnosing patients ’ cases. Finally, the MIAWARE software can be considered also as a teaching tool for future radiologists and physicians.

    Conformal weights in the Kerr/CFT correspondence

    Full text link
    It has been conjectured that a near-extreme Kerr black hole is described by a 2d CFT. Previous work has shown that CFT operators dual to axisymmetric gravitational perturbations have integer conformal weights. In this paper, we study the analogous problem in 5d. We consider the most general near-extreme vacuum black hole with two rotational symmetries. This includes Myers-Perry black holes, black rings and Kaluza-Klein black holes. We find that operators dual to gravitational (or electromagnetic or massless scalar field) perturbations preserving both rotational symmetries have integer conformal weights, the same for all black holes considered.Comment: 19 page

    Comparison of endogenous GHB concentrations in blood and hair in death cases with emphasis on the post mortem interval

    Get PDF
    Gamma-hydroxybutyric acid (GHB) is an endogenous compound which has a story of clinical use and illicit abuse since the 1960’s. The possibility to use a multi-sample approach of GHB evaluation, including whole blood and hair, to better characterize a forensic toxicology case and evaluate a possible causal association with the death, is an exciting up-to-date issue. In addition, its post-mortem behaviour, namely regarding degradation and metabolism, has been increasingly investigated as a putative biomarker for post-mortem interval (PMI) estimation. Thus, In order to contribute to clarify this specific aspect, whole blood and hair post-mortem GHB levels were evaluated in thirty two real cases with previous information on death and autopsy data. The results obtained suggest that the PMI (until 5 days between death and sampling) influences GHB whole blood concentration, but not GHB levels in hair samples. No differences were encountered for the other parameters evaluated, including age, gender, cause of death and presence or absence of substances. This study brings new insights regarding the usefulness of GHB levels in forensic toxicology, which might be further strengthened with larger, but comparable, studies from other laboratories and institutions in the context of legal medicine.info:eu-repo/semantics/acceptedVersio

    A fast and reliable method for GHB quantitation in whole blood by GC–MS/MS (TQD) for forensic purposes

    Get PDF
    Gamma-Hydroxybutyric Acid (GHB) is an endogenous compound with a story of clinical use since the 1960’s. However, due to its secondary effects, it has become a controlled substance, entering the illicit market. A fully validated, sensitive and reproducible method for the quantification of GHB by methanolic precipitation and GC-MS/MS (TQD) in whole blood is presented. Using 100 µL of whole blood, obtained results included a LOD and LLOQ of 0.1 mg/L and a recovery of 86% in a working range between 0.1 and 100 mg/L. This method is sensitive and specific to detect the presence of GHB in small amounts of whole blood (both ante-mortem or post-mortem), and is, to the authors’ knowledge, the first GC-MS-MS TQD method that uses different precursor ions and product ions for the identification of GHB and GHB-D6 (internal standard). Hence, this method may be especially useful for the study of endogenous values in this biological sample.info:eu-repo/semantics/acceptedVersio

    Fluid flows through unsaturated porous media: An alternative simulation procedure

    Get PDF
    This article studies fluid flows through an unsaturated porous matrix, modeled under a mixture theory viewpoint, which give rise to nonlinear hyperbolic systems. An alternative procedure is employed to simulate these nonlinear nonhomogeneous hyperbolic systems of two partial differential equations representing mass and momentum conservation for the fluid (liquid) constituent of mixture. An operator splitting technique is employed so that the nonhomogeneous system is split into a time-dependent ordinary portion and a homogeneous one. This latter is simulated by employing Glimm’s scheme and an approximate Riemann solver is used for marching between two consecutive time steps. This Riemann solver conveniently approximates the solution of the associated Riemann problem by piecewise constant functions always satisfying the jump condition – giving rise to an approximation easier to implement with lower computational cost. Comparison with the standard procedure, employing the complete solution of the associated Riemann problem for implementing Glimm’s scheme, has shown good agreement

    Early Carboniferous synorogenic basins evolution of the Ossa-Morena and

    Get PDF
    The stratigraphic record of the Early Carboniferous in Iberia reveals that synorogenic deposition was important and occurred simultaneously in basins influenced by extension and contraction with gravitational instability. In NW Iberia (Galicia – Trás-os-Montes Zone) contraction was dominant and the deposition took place in a forebulge outwards from the nappe stacking front. Here, synorogenic deposits were strongly affected by folding and thrusting as they were imbricated and incorporated in the allochthonous pile. In a different way, in SW Iberia (Ossa-Morena Zone) synorogenic deposition was influenced by extension and happened simultaneously with the onset of significant magmatism
    corecore