Mostrando recursos 61 - 80 de 2,552

  1. Implicaciones del determinismo tecnológico en la fragmentación de las ciencias musicales

    Joaquina Labajo Valdés

  2. Há endogeneidade no acesso às políticas de desenvolvimento tecnológico e exportador no Brasil?

    Graziela Ferrero Zucoloto; Mauro Oddo Nogueira; Daniel da Silva Grimaldi; Flávio Lyrio Carneiro
    Este artigo analisa a relação entre três estudos realizados com o objetivo de avaliar políticas públicas selecionadas de apoio à exportação e ao desenvolvimento tecnológico, discutindo como incentivos governamentais podem resultar no apoio a agentes que já realizam as atividades a serem apoiadas. As políticas em questão se referem à promoção às exportações; a incentivos fiscais à pesquisa e desenvolvimento (P&D) concedidos no âmbito da Lei do Bem; e à dinâmica das parcerias tecnológicas entre institutos de ciência e tecnologia (ICT) e empresas do setor de informática, desenvolvidas a partir dos créditos oferecidos pelo Fundo Setorial de Tecnologia da Informação...

  3. Un cambio de paradigma: el debate sobre la relación entre cultura y medios de comunicación en los organismos internacionales de ámbito cultural y socioeconómico (Unesco y Consejo de Europa, 1970 - 1980)

    Carrasco Campos, Angel; Saperas, Enric
    La cultura ha sido siempre una realidad cambiante de forma paralela al desarrollo de las civilizaciones: todas las sociedades generan ar quetipos culturales como consecuencia del cambio de sus rasgos sociales, políticos y sim bólicos. El último proceso de formación de un arquetipo cultural tuvo su origen en los años sesenta. En ese momento se inicia el proceso de definición del modelo de cultura actualmente vigente y hegemónico; un modelo caracterizado por su carácter transnacional, participativo, plural e inclusivo, ampliando la noción tradicional de cultura como patrimonio, ciencia, artes y humanidades. Como consecuencia de los avances tecnológicos y de la globalización de...

  4. Nuevos códigos del cine de ciencia ficción en la hipermodernidad: el mesianismo tecnológico y la virtualidad múltiplex

    Corredor Pérez, Diego; Bel Enguix, Gemma; Molero Bernáldez, Margarita
    La realidad virtual es aquella creada por ordenador y creíble para la mente humana. Dentro de la realidad virtual, se distinguen tres delimitaciones distintas: a) un mundo paralelo generado por herramientas informáticas, b) la realidad advenida mediante el sueño, y c) la implantación de chips de memoria que introducen una estructura diferente de lo real. El cine de ciencia ficción se ha ocupado profus amente de la realidad virtual, modificando sus códigos a medida que cambiaban: a) las posibilidades de utilización de los efectos especiales, b) las características socioculturales y estéticas de la sociedad, que se ilustran con la aparición de...

  5. MiNube

    Villanueva Hernández, Yarilo David

    [ES]MiNube es una solución de almacenamiento de datos online enfocada en la privacidad, seguridad y control del usuario final. A diferencia de otras plataformas de almacenamiento en la nube en el que se depende de agentes externos, MiNube cede el control de los datos al usuario, permitiéndole configurar su propio entorno y definiendo políticas de encriptación en las que el propio usuario es el único agente capaz de acceder a sus datos. MiNube se compone de tres partes: Un servidor web para servir archivos, una aplicación web para acceder a los mismos, y un cliente de escritorio multiplataforma encargado de...

  6. Soil-geosynthetic interaction: interface parameters in granular soils

    Micaela Oliveira; Agostinho Mendonça; M. Lurdes Lopes
    Intensive research on soil/geosynthetic interface behaviour have been developed, since 1995, by a research group of the Faculty of Engineering of Porto University. In this research soil/geosyntheticinterface behaviour was characterized by performing pullout, direct shear and inclined shear tests with different types of geosynthetics, namely, geotextiles, geogrids and geomembranes confined by granular soils.An overall treatment of the research collected data from geogrids pullout tests will be presented, in order to define correlations between the interface coefficient, f, and the application conditions of different types of geogrids and confining materials. By applying statistical analysis to the different correlations it was possibleto...

  7. Design of a structure of fine soil reinforced with geosynthetics parametric study

    David Carlos; Margarida Pinho-Lopes; Maria Lopes
    This paper presents a parametric study regarding the effect of everal parameters used in the design method of British Standard BS8006-1: 2009 for the design of reinforced soil structures. The design of astructure is performed using solutions which include one type of soil and five different geosynthetics. The parameters considered were: (1) the coefficient of friction and the adhesion coefficient between the soiland the geosynthetic; (2) the ultimate tensile strength of the geosynthetic; (3) the partial material factorfor the reinforcement; and (4) the total horizontal width of the top and bottom faces of the reinforcingelement at the layer (per meter)....

  8. Synergisms in the chemical degradation of polypropylene geotextiles some experimental results

    José Ricardo Carneiro; Paulo Joaquim Almeida; Maria de Lurdes Lopes
    Durability ( resistance to degradat ion) is cur rent ly a very important topic of research in geosynthet ics. The exist ing studies about this topic consider most ly the isolated act ion of the degradat ion agents and do not contemplate the interact ions that can occur between them. In this work, some interact ions (synergies) that may exist between some agents/ types of degradat ion of geosynthetics were invest igated. To this end, a non-woven needle-punched polypropylene geotext ile stabilised with 0.2% (w/w) of the addit iveChimassorb 944 was exposed to several durability tests. Initially, the material was...

  9. Impacto de los subsidios a la investigación en la productividad científica

    Vázquez, Claudia
    El objetivo de este trabajo consiste en evaluar el impacto de un programa de subsidios a la investigación. En particular, se evalúan las convocatorias 2004 a 2008 de los Proyectos de Investigación Científica y Tecnológica (PICT), el principal instrumento de apoyo a la investigación científica dentro de la ANPCyT de Argentina. Siguiendo a la literatura, las variables de resultado se basan en indicadores bibliométricos construidos a partir de la base de datos SCOPUS. Se encuentra que el programa tiene en promedio un impacto positivo en la productividad de los beneficiarios, medida como la cantidad total de publicaciones en revistas indexadas....

  10. Ambient vibration re-testing and operational modal analysis of the Humber Bridge

    brownjohn, jmw; magalhaes, f; caetano, e; cunha, a
    An ambient vibration survey of the Humber Bridge was carried out in July 2008 by a combined team from the UK, Portugal and Hong Kong. The exercise had several purposes that included the evaluation of the current technology for instrumentation and system identification and the generation of an experimental dataset of modal properties to be used for validation and updating of finite element models for scenario simulation and structural health monitoring. The exercise was conducted as part of a project aimed at developing online diagnosis capabilities for three landmark European suspension bridges. Ten stand-alone tri-axial acceleration recorders were deployed at...

  11. Ambient and free vibration tests of the Millau Viaduct: Evaluation of alternative processing strategies

    magalhaes, f; caetano, e; cunha, a; flamand, o; grillaud, g
    The Millau Viaduct is an outstanding multi-span cable-stayed bridge located in southern France that opened to traffic in 2004. It is the tallest vehicular bridge in the world, with the top of a pylon rising at 343 m above the river level, and due to its total length of 2460 m, it also the longest cable-stayed bridge in the world. The present work aims to demonstrate the usefulness of ambient vibration tests performed at the commissioning stage and is specially focused on the evaluation of the efficiency and accuracy of alternative state-of-the-art processing strategies for identification of the modal parameters...

  12. Measurement of concrete E-modulus evolution since casting: A novel method based on ambient vibration

    azenha, m; magalhaes, f; faria, r; cunha, a
    The use of ambient vibration tests to characterize the evolution of E-modulus of concrete right after casting is investigated in this paper. A new methodology is proposed, which starts by casting a concrete cylindrical beam inside a hollow acrylic formwork. This beam is then placed horizontally, simply supported at both extremities, and vertical accelerations resulting from ambient vibration are measured at mid-span. Processing these mid-span acceleration time series using power spectral density functions allows a continuous identification of the first flexural frequency of vibration of the composite beam, which in turn is correlated with the evolutive E-modulus of concrete since...

  13. Damping estimation using free decays and ambient vibration tests

    magalhaes, f; cunha, a; caetano, e; brincker, r
    This paper studies the quality of modal damping ratios estimates based on ambient and free vibration tests using both numerical simulations and data collected on large Civil Engineering structures where both tests were performed. The simulated data allowed to study the influence of factors like non-proportional damping or proximity of natural frequencies on the quality of the estimates and also to illustrate the influence of the identification algorithms parameters on the accuracy of the results. The analysis of data collected on a cable-stayed bridge, on the suspended roof of a stadium and on a footbridge permitted to compare the results...

  14. Numerical and experimental studies of the Braga Sports Stadium suspended roof

    caetano, e; cunha, a; magalhaes, f
    This paper describes a set of dynamic numerical and experimental studies conducted on the suspended roof of the Braga Municipal Sports Stadium. Modal parameters, calculated from a numerical model of the constructed structure that takes into account the geometrically nonlinear structural behaviour and the progressive application of loads, are compared with the corresponding parameters identified on the basis of an ambient vibration test. Particular attention is given to modal damping identification due to the necessity of analysing the susceptibility of the suspended roof to buffeting effects.

  15. Evaluation of dynamic effects and fatigue assessment of a metallic railway bridge

    marques, f; cunha, a; fernandes, aa; caetano, e; magalhaes, f
    In the framework of the national research project Evaluation of the structural integrity of metallic railway bridges, the Laboratory of Vibrations and Monitoring of the Faculty of Engineering of the University of Porto, Portugal has recently developed a study concerning the assessment of the dynamic behaviour and fatigue condition of a metallic railway bridge on the international Beira Alta route in Portugal. This paper describes the numerical simulation of the dynamic behaviour of the bridge under railway traffic, the experimental updating and validation of the finite-element model used, and the estimation of the fatigue residual life using different code specifications...

  16. ESPAÇO COMO DESEJO. THE IDEAL SPACE, Centro de Investigação sobre modos de habitar, 1º Workshop

    Carlos Nuno Lacerda Lopes

  17. Arquitectura e Modos de Habitar: Pedro Ramalho

    Carlos Nuno Lacerda Lopes

  18. Editorial: 1st MICCAI workshop on bio- imaging and visualization for patient-customized simulations


  19. Structural health monitoring of offshore wind turbines using automated operational modal analysis

    C. Devriendt; F. Magalhães; W. Weitjens; G. De Sitter; Á. Cunha; P.Guillaume

  20. Modal analysis for the rehabilitation assessment of the Luiz I Bridge

    B. Costa; F. Magalhães; Á. Cunha; J. Figueiras

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