2,871 research outputs found

    Natural Language Generation and Fuzzy Sets : An Exploratory Study on Geographical Referring Expression Generation

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    This work was supported by the Spanish Ministry for Economy and Competitiveness (grant TIN2014-56633-C3-1-R) and by the European Regional Development Fund (ERDF/FEDER) and the Galician Ministry of Education (grants GRC2014/030 and CN2012/151). Alejandro Ramos-Soto is supported by the Spanish Ministry for Economy and Competitiveness (FPI Fellowship Program) under grant BES-2012-051878.Postprin

    Running Gluon Mass from Landau Gauge Lattice QCD Propagator

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    The interpretation of the Landau gauge lattice gluon propagator as a massive type bosonic propagator is investigated. Three different scenarios are discussed: i) an infrared constant gluon mass; ii) an ultraviolet constant gluon mass; iii) a momentum dependent mass. We find that the infrared data can be associated with a massive propagator up to momenta 500\sim 500 MeV, with a constant gluon mass of 723(11) MeV, if one excludes the zero momentum gluon propagator from the analysis, or 648(7) MeV, if the zero momentum gluon propagator is included in the data sets. The ultraviolet lattice data is not compatible with a massive type propagator with a constant mass. The scenario of a momentum dependent gluon mass gives a decreasing mass with the momentum, which vanishes in the deep ultraviolet region. Furthermore, we show that the functional forms used to describe the decoupling like solution of the Dyson-Schwinger equations are compatible with the lattice data with similar mass scales.Comment: Version to appear in J. Phys. G. New version include some rewriting and new analysis. In particular, the section on the running mass is ne

    Acaricides sublethal effects are more harmful to predatory mite Phytoseiulus macropilis Banks (Acari: Phytoseiidae) than to the pest Tetranychus urticae Koch (Acari: Tetranychidae)

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    Evaluar el efecto letal y subletal de los acaricidas abamectina y dimetoato al depredador P. macropilis y su presa T. urticae. Alcance: Efecto letal y subletal de los acaricidas a P. macropilis y T. urticae. Metodología: Se determinó en experimentos de laboratorio el efecto letal y subletal de los acaricidas abamectina y dimetoato al depredador P. macropilis y su presa T. urticae. Principales resultados: T. urticae fue 2.6 veces y 4.2 veces más tolerante que P. macropilis a la abamectina y al dimetoato, respectivamente. La tasa instantánea de crecimiento poblacional de la presa y el depredador disminuyó linealmente con el aumento de las concentraciones de ambos acaricidas. Sin embargo, la tasa instantánea de crecimiento poblacional del depredador disminuyó más rápidamente que la de la plaga, lo que resultó en la extinción de las poblaciones del depredador, mientras que la población de plagas persistió. Conclusiones: Los agricultores pueden lograr un mejor control de la plaga no aplicando acaricidas, sino manejando las poblaciones de este depredador en el campo utilizando técnicas naturales de conservación del enemigo.To evaluate the lethal and sublethal effect of the abamectin and dimethoate acaricides on the predator P. macropilis and its prey T. urticae. Scope: Lethal and sublethal effect of acaricides on P. macropilis and T. urticae. Methodology: The lethal and sublethal effect of the abamectin and dimethoate acaricides on the predator P. macropilis and its prey T. urticae was determined in laboratory experiments. Main results: T. urticae was 2.6-fold and 4.2-fold more tolerant than P. macropilis to abamectin and dimethoate, respectively. The instantaneous rate of increase of prey and predator decreased linearly with increasing concentrations of both acaricides. However, the instantaneous rate of increase of the predator population decreased more rapidly than that of the pest, resulting in extinction of predator populations, whereas the pest population persisted. Conclusions: Farmers may achieve better control by not spraying acaricides, but managing the populations of this predator in the field using natural enemy conservation techniques

    Thermal requirements of Trigonospila unicaldasi (DIPTERA: TACHINIDAE), parasitoid of Compsus sp. (COLEOPTERA: CURCULIONIDAE)

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    Objetivos: Determinar el periodo de duración de los estados de desarrollo de Trigonospila unicaldasi, bajo cinco regímenes térmicos distintos (18, 20, 22, 25 y 28 °C), usando a Compsus sp. como sustrato y calcular la temperatura base de desarrollo y los grados días acumulados (o constante térmica) para completar los estados de desarrollo del parasitoide. Alcance: Exigencias térmicas de T. unicaldasi. Metodología: Se determinó el tiempo de duración de los diferentes estados de desarrollo de T. unical dasi con la ayuda de un estereomicroscopio, hasta llegar a estado adulto. Los grados días se calcularon mediante el método de la temperatura media. Principales resultados: Los estados de huevo, larva 1, larva 2, larva 3, pupa y periodo de huevo a adulto de T. unicaldasi presentaron temperaturas base de 18,6; 19,2; 17,7; 19,1; 18,6 y 18,8 °C, respectivamente y constantes térmicas de 29,9; 14,5; 21,4; 16,3; 17,5 y 97,4 °D, respectivamente. Conclusiones: Se determinaron las exigencias térmicas de T. unicaldasi, nueva especie parasitoide de Compsus sp.Objectives: To determine the period of duration of the developmental stages of Trigonospila unicaldasi, under five different thermal regimes (18, 20, 22, 25 and 28 °C), using Compsus sp. as a substrate, and to calculate the base temperature of development and the accumulated days-degrees (or thermal constant) to complete the developmental stages of the parasitoid. Scope: Thermal requirements of T. unicaldasi. Methodology: Th e duration of the diff erent stages of development of T. unicaldasi was determined until reaching adulthood with the help of a stereomicroscope. Th e days-degrees were calculated using the average temperature method. Main results: Th e stages of the egg, larva 1, larva 2, larva 3, pupa and adult egg of T. unicaldasi, showed base temperatures of 18.6; 19.2; 17.7; 19.1; 18.6 and 18.8 °C respectively, and thermal constants of 29.9; 14.5; 21.4; 16.3; 17.5 and 97.4 °D, respectively. Conclusions: The thermal requirements of T. unicaldasi, a new parasitoid species of Compsus sp., were determined

    CARACTERIZAÇÃO FÍSICA E MECÂNICA DE BLOCOS DE CONCRETO PARA PAVIMENTAÇÃO COM AGREGADOS RECICLADOS

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    The Construction Materials Laboratory of the Federal University of Tocantins, Palmas campus, produces a lot of concrete waste in the form of specimens, as a result of academic research carried out by Civil Engineering students. These residues are discarded close to the laboratory and do not have a proper destination, and that is why it has become a problem. The present research sought to use these crushed residues as coarse aggregates in the production of precast paving blocks and compared them with a reference mix. The replacements were in the contents of 25%, 50% and 75% of natural aggregates. The evaluation of the viability of the replacement was carried out through the dimensional analysis, compressive strength and water absorption tests of the produced blocks. The water absorption of all paving blocks satisfactorily complied with what is specified in the standard. The mixes using recycled aggregates achieved greater compressive strength compared to the reference mix, and the mixture with a content of 75% showed the best mechanical behavior. In this way, it was possible to show through the research a new destination for concrete waste from laboratories, minimizing the environmental and visual impacts within the university and enabling an adequate destination.El Laboratorio de Materiales de Construcción de la Universidad Federal de Tocantins, Palmas, produce una gran cantidad de desechos de concreto en forma de probetas de las investigaciones académicas realizada por estudiantes de Ingeniería Civil. Estos residuos se desechan cerca del laboratorio y no tienen un destino adecuado, por eso se ha convertido en un problema. La presente investigación buscó utilizar estos residuos triturados como agregados gruesos en la producción de adoquines prefabricados y los comparó con un hormigón de referencia. La proporción de sustitución fue de 25%, 50% y 75%. En la investigación se realizó un análisis dimensional, ensayos de resistencia a la compresión y absorción de agua de los bloques producidos. La absorción de agua de todos los adoquines cumplió satisfactoriamente con lo especificado en la norma. Las mezclas que utilizan áridos reciclados lograron una mayor resistencia a la compresión en comparación con la mezcla de referencia, y la mezcla con un contenido del 75% mostró el mejor comportamiento mecánico. De esta forma, fue posible mostrar a través de la investigación un nuevo destino para los residuos de hormigón de los laboratorios, minimizando los impactos ambientales y visuales dentro de la universidad y posibilitando un destino adecuado.O Laboratório de Materiais de Construção da Universidade Federal do Tocantins, campus Palmas, produz resíduos de concreto em forma de corpos de prova, em função das pesquisas acadêmicas desenvolvidas pelos alunos de Engenharia Civil. Esses resíduos são descartados próximos ao laboratório e não possuem destinação adequada, e por isso tem se tornado um problema. A presente pesquisa buscou utilizar esses resíduos britados como agregados graúdos na produção de blocos de pavimentação pré-moldados e comparou com um traço de referência. As substituições foram nas proporções de 25%, 50% e 75%. A avaliação da viabilidade da substituição foi realizada por meio dos ensaios de análise dimensional, resistência à compressão e absorção de água dos blocos produzidos. A absorção de água de todos os blocos cumpriram satisfatoriamente com o especificado na norma. Os traços com uso de agregados reciclados alcançaram maiores resistências à compressão com relação ao traço de referência, sendo a mistura com teor de 75% que apresentou melhor comportamento mecânico. Dessa forma, foi possível mostrar por meio da pesquisa uma nova destinação aos resíduos de concreto dos laboratórios, minimizando os impactos ambientais e visuais no âmbito da universitário e possibilitando uma destinação adequada

    Municipal energy management model for Cuban first level municipalities

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    The Government of Cuba proposed in the year 2011 an update of the economic and social model, where the management of energy is an element of influence in the economy of the country. This led to the approval of a policy for the development of renewable sources and the efficient use of energy. Another important aspect is the National Plan for development until 2030, which considers the use of natural resources including energy, environmental impacts, and its link with the local development. However, in the municipalities, there are few studies on local energy management (LEM), and they lack the essential elements to guarantee it. This study defined the elements of LEM for the management models of local governance in Cuba, the energy context, and the scenario for the development of LEM in the country. The results suggest a model for LEM that integrates its elements to the functions of local government in energy decisions that influence the economy, society, the environment and local development

    Ghost dynamics in the soft gluon limit

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    We present a detailed study of the dynamics associated with the ghost sector of quenched QCD in the Landau gauge, where the relevant dynamical equations are supplemented with key inputs originating from large-volume lattice simulations. In particular, we solve the coupled system of Schwinger-Dyson equations that governs the evolution of the ghost dressing function and the ghost-gluon vertex, using as input for the gluon propagator lattice data that have been cured from volume and discretization artifacts. In addition, we explore the soft gluon limit of the same system, employing recent lattice data for the three-gluon vertex that enters in one of the diagrams defining the Schwinger-Dyson equation of the ghost-gluon vertex. The results obtained from the numerical treatment of these equations are in excellent agreement with lattice data for the ghost dressing function, once the latter have undergone the appropriate scale-setting and artifact elimination refinements. Moreover, the coincidence observed between the ghost-gluon vertex in general kinematics and in the soft gluon limit reveals an outstanding consistency of physical concepts and computational schemes.Comment: 34 pages, 12 figure

    Efficient graphene saturable absorbers on D-shaped optical fiber for ultrashort pulse generation

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    ABSTRACT: We demonstrated a method to construct high efficiency saturable absorbers based on the evanescent light field interaction of CVD monolayer graphene deposited on side-polished D-shaped optical fiber. A set of samples was fabricated with two different core-graphene distances (0 and 1μm), covered with graphene ranging between 10 and 25mm length. The mode-locking was achieved and the best pulse duration was 256fs, the shortest pulse reported in the literature with CVD monolayer graphene in EDFL. As result, we find a criterion between the polarization relative extinction ratio in the samples and the pulse duration, which relates the better mode-locking performance with the higher polarization extinction ratio of the samples. This criterion also provides a better understanding of the graphene distributed saturable absorbers and their reproducible performance as optoelectronic devices for optical applications

    ESTRATÉGIAS METODOLÓGICAS PARA/NA ELABORAÇÃO DE UMA PROPOSTA CURRICULAR: A UNIDADE NA COLETIVIDADE NO PERCURSO DE UMA POLÍTICA EDUCACIONAL

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    Este texto objetiva apresentar aspectos subjacentes ao percurso metodológico de elaboração da Proposta Curricular da Rede Pública Municipal de Educação de Feira de Santana-BA, especialmente do trabalho desenvolvido por uma comissão denominada de Comissão Revisora e do seu olhar na organização do documento, durante os anos de 2015 a 2019. Na elaboração da proposta, a metodologia adotada foi a da pesquisa-ação (BARBIER, 2004) primando pela colaboratividade como princípio fundante para o desenvolvimento de suas ações. Apoiou-se teoricamente em autores como Contreras (2012), Arroyo (2011), Sacristán (2000) e Freire (1997) para inquirir sobre como manter a unidade metodológica em uma construção coletiva. Demarca o local de desenvolvimento da pesquisa, a colaboração de diferentes partícipes e os diálogos decorrentes. Indica ainda a inextricável relação entre currículo e condições de trabalho docente, bem como o desafio de fazer jus ao movimento metodológico adotado sem escamotear as características locais de sua elaboração. O estudo comprova a importância da definição metodológica em contextos de pesquisa envolvendo expressivo universo educacional, como o caso de uma rede pública municipal, bem como de sua assertividade na produção colaborativa de documentos curriculares. Além disso, considera-se tanto a ideia da criação de uma Comissão Revisora quanto de sua composição por professoras da própria rede, atrelada aos investimentos em formação stricto sensu como pontos favorecedores à eficácia requerida em trabalhos desta natureza

    JPCam: A 1.2Gpixel camera for the J-PAS survey

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    JPCam is a 14-CCD mosaic camera, using the new e2v 9k-by-9k 10microm-pixel 16-channel detectors, to be deployed on a dedicated 2.55m wide-field telescope at the OAJ (Observatorio Astrofisico de Javalambre) in Aragon, Spain. The camera is designed to perform a Baryon Acoustic Oscillations (BAO) survey of the northern sky. The J-PAS survey strategy will use 54 relatively narrow-band (~13.8nm) filters equi-spaced between 370 and 920nm plus 3 broad-band filters to achieve unprecedented photometric red-shift accuracies for faint galaxies over ~8000 square degrees of sky. The cryostat, detector mosaic and read electronics is being supplied by e2v under contract to J-PAS while the mechanical structure, housing the shutter and filter assembly, is being designed and constructed by a Brazilian consortium led by INPE (Instituto Nacional de Pesquisas Espaciais). Four sets of 14 filters are placed in the ambient environment, just above the dewar window but directly in line with the detectors, leading to a mosaic having ~10mm gaps between each CCD. The massive 500mm aperture shutter is expected to be supplied by the Argelander-Institut fur Astronomie, Bonn. We will present an overview of JPCam, from the filter configuration through to the CCD mosaic camera. A brief outline of the main J-PAS science projects will be included.Comment: 11 pages and 9 figure
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