761 research outputs found
JIDA'20. Bloque 4. Role-Play como estrategia docente en el aprendizaje de la construcción | Filomena Pérez Gálvez
No full textComunicación a cargo de Filomena Pérez Gálvez; Manuel Alejandro Pedreño Rojas; María Jesús Morales Conde; Paloma Rubio de Hita. Universidad de Sevilla. Escuela Técnica Superior de Arquitectura. Modera el Bloque 4 Daniel García-Escudero (ETSAB-UPC)
JIDA'20. Bloque 4. Role-Play como estrategia docente en el aprendizaje de la construcción | Filomena Pérez Gálvez
No full textComunicación a cargo de Filomena Pérez Gálvez; Manuel Alejandro Pedreño Rojas; María Jesús Morales Conde; Paloma Rubio de Hita. Universidad de Sevilla. Escuela Técnica Superior de Arquitectura. Modera el Bloque 4 Daniel García-Escudero (ETSAB-UPC)
Editorial Trend UR Number 29 Special
No full textEncuentre en este número especial elaborado en el marco del Filbo Digital 2021, las siguientes contribuciones: Editorial por: Tatiana Morales Perdomo - Al encuentro con: La Librería: Negocio, Cultura & Comunidad / Verónica Mendoza Urista ; Hacia lo desconocido: Unebook en la pandemia y el futuro inmediato / Alejandro Fernández Diego ; La red de espacios UNE y las librerías universitarias / Ana Isabel González González. - Debate: Librerías, conocimiento y cambio social / Felipe Grismaldo Sandoval ; Librería Al Pie de la Letra: 28 años continuos de servicio en el crecimiento cultural de Medellín / Gloria Melo ; Odisea de una Librería Universitaria / Gladys Grajales Mesa ; Confiar en el Tiempo / Tomás David Rubio Casas. - Novedades: Autores suecos-Filbo. ; Algunas novedades para esta feriaFind in this special issue prepared within the framework of Filbo Digital 2021, the following contributions: Editorial by: Tatiana Morales Perdomo - Meeting with: The Library: Business, Culture & Community / Verónica Mendoza Urista; Towards the unknown: Unebook in the pandemic and the immediate future / Alejandro Fernández Diego; The network of UNE spaces and university bookstores / Ana Isabel González González. - Debate: Libraries, knowledge and social change / Felipe Grismaldo Sandoval; Librería Al Pie de la Letra: 28 continuous years of service in the cultural growth of Medellín / Gloria Melo; Odyssey of a University Bookstore / Gladys Grajales Mesa; Trust in Time / Tomás David Rubio Casas. - News: Swedish authors-Filbo. ; Some news for this fai
Technology Adoption in Nonrenewable Resource Management
No full textNonrenewable resource scarcity has been a traditional concern when designing optimal growth models. Technological change has played an important role in those models, since its presence is assumed to mitigate the depletion effect on extraction paths over time. We formalize the general problem of a competitive nonrenewable resource extracting firm to analyze optimal extraction behavior and technology adoption when adoption is costly, both in a deterministic and a stochastic environment, when the firm either anticipates adoption or not. Based on a quadratic extraction cost function, our results do not support the traditional view according to which the firm will only incur in an adoption cost when the stock is depleted enough.nonrenewable resources; technology adoption; depletion effect; cost of adoption.
Modern energy consumption and economic modernisation in Latin America and the Caribbean between 1890 and 1925
No full textIn the absence of comparable macroeconomic indicators for most of the Latin American economies before the 1930s, the apparent consumption of energy is used in this paper as a proxy of the degree of modernisation of Latin America and the Caribbean. This paper presents an estimate of the apparent consumption per head of modern energies (coal, petroleum and hydroelectricity) for 30 countries of Latin American and the Caribbean for 1890 to 1925, multiplying the number of countries for which energy consumption estimates were previously available. As a result, the paper provides the basis for a quantitative comparative analysis of modernisation performance beyond the few countries for which historical national accounts are available in Latin America.Energy consumption, economic modernisation, Latin America
The internal and external flow fields of a structured porous coated cylinder and implications on flow-induced noise
No full textPorous coated cylinders have been shown to reduce the vortex shedding tone and broadband noise of a bare cylinder placed in uniform flow within specific Reynolds number regimes. The processes by which the vortex shedding and thus tone suppression take place are still uncertain despite numerous numerical and experimental studies. It is understood that adding a porous medium to a bare cylinder will have an influence on the Reynolds number of cylinder, yet the increase of outer diameter alone and the influences of surface roughness are insufficient to explain the changes in the shedding tone magnitude and frequency that are observed by many. Investigating the internal flow field of a porous coated cylinder could lead to a deeper understanding of the flow processes that result in the tonal noise reduction. This has not been achieved to date, as commonly used materials such as metal foam and polyurethane possess randomized porous structures, which make investigating the internal flow field nearly impossible without affecting the structure itself. This paper presents a preliminary analysis of the internal and external flow fields of two structured porous coated cylinders. The cylinders were manufactured using solid transparent materials that possess direct lines of sight through the pores in the axial and spanwise directions. Such structured porous coated cylinders have been previously successful in reducing the typical vortex shedding tone. Tomographic and 2-D planar Particle Image Velocimetry (PIV) were used in a water-tunnel facility to visualize the internal and external flow fields. To date only the 2-D planar PIV results have been post-processed that reveal differences in the wake for the two different cylinder types such as recirculation of flow around the pores. Vorticity flow structures are observed to vary along the cylinder span in the same pattern as the porous structure and streamlines at the windward cylinder side reveal the entry of flow into the porous medium.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Aircraft Noise and Climate EffectsWind Energ
Conjunto de datos: Villancicos en la Hispanoamérica colonial
No full textEsta base de datos, resultante del proyecto FONDECYT 1230736, incluye 2146 registros correspondientes a partituras de villancicos de la época colonial que se han conservado en Hispanoamérica.
El vaciado se ha efectuado a partir del trabajo seminal de Stevenson (1970) y de catálogos más específicos y recientes publicados por diversos autores que dan cuenta de colecciones musicales conservadas en: la Catedral de Bogotá (Perdomo 1976); el Seminario de Antonio Abad del Cuzco (Quezada 2004); el Archivo Arzobispal de Lima (Stevenson 1970); la Catedral de México (Rubio, Davies y Cherñavsky 2014); el Archivo y Biblioteca Nacionales de Bolivia (Beltrán 2012); la Catedral de Puebla (Tello, Franco y Maní 2015); la Colección Sánchez Garza (Tello, Hurtado, Morales y Pérez 2022); y la Catedral de Santiago de Chile (Claro 1974; Vera 2024).
La base de datos da cuenta del compositor, el título de la obra (ambos normalizados), el archivo o colección que la contiene, la ciudad donde se conserva, el subgénero correspondiente (e.g. jácaras), el número de voces, el tono polifónico (las pocas veces que se indica en la fuente), la fiesta o advocación, un sumario del campo anterior para facilitar la búsqueda, el año, las fuentes utilizadas, cinco campos para indicar la existencia de concordancias y contrafacta, y un campo final de observaciones.
Se trata de una muestra parcial pero, al mismo tiempo, representativa y amplia, que busca facilitar la búsqueda de obras y la localización de concordancias tanto a los investigadores profesionales como a estudiantes y personas interesadas en este fascinante género musical.202
Experimental characterization of the turbulent boundary layer over a porous trailing edge for noise abatement
No full textThe hydrodynamic and acoustic fields for a NACA 0018 with solid and porous trailing edge inserts are investigated. The porous inserts, covering 20% of the chord, are manufactured with metal foams with cell diameters of 450 and 800 μm and permeability values of 6 × 10−10 and 2.7 × 10−9 m2. The experiments are performed at a chord-based Reynolds number of 2.63 × 105 and an angle of attack of 0°. The porous trailing edge with higher permeability provides up to 11 dB noise attenuation with respect to the solid case for frequencies below a cross-over Strouhal number St = 0.26. Lower noise abatement (up to 7 dB) takes place below St = 0.3 for the insert with lower permeability. Conversely, noise increase with respect to the solid case is measured above the previously defined St value. A decrease in turbulence intensity is reported (up to 3% of the free-stream velocity), with lower intensity being measured for the insert with lower permeability. It is also observed that the permeability of the insert is linked to the increase of the anisotropy of highly energetic turbulent motions, being stretched in the streamwise direction, and the reduction of the eddy convection velocity (up to 20% with respect to the baseline case). In view of the results, the reduction of the velocity fluctuations is proposed as one of the mechanisms for low frequency noise abatement, being more relevant for the metal foam insert with lower permeability.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Aircraft Noise and Climate EffectsWind EnergyNovel Aerospace Material
Mechanisms of broadband noise generation on metal foam edges
No full textThe turbulent flow over a porous trailing edge of a NACA 0018 airfoil is experimentally investigated to study the link between the hydrodynamic flow field and the acoustic scattering. Four porous trailing edges, obtained from open-cell metal foams, are tested to analyze the effects on far-field noise of the permeability of the material and of the hydrodynamic communication between the two sides of the airfoil. The latter is assessed by filling the symmetry plane of two of the porous trailing edges with a thin layer of adhesive that acts as a solid membrane. Experiments are performed at a zero degree angle of attack. Far-field noise measurements show that the most permeable metal foam reduces noise (up to 10 dB) with respect to the solid trailing edge for Strouhal numbers based on the chord below 16. At higher nondimensional frequencies, a noise increase is measured. The porous inserts with an adhesive layer show no noise abatement in the low frequency range, but only a noise increase at higher frequency. The latter is, therefore, attributed to surface-roughness noise. Flow field measurements, carried out with time-resolved planar particle image velocimetry, reveal correlation of near-wall velocity fluctuations between the two sides of the permeable trailing edges only within the frequency range where noise abatement is reported. This flow communication suggests that permeable treatments abate noise by distributing the impedance jump across the foam in the streamwise direction, promoting noise scattering from different chordwise locations along the inserts. This is further confirmed by noise source maps obtained from acoustic beamforming. For the frequency range where noise reduction is measured, the streamwise position of the main noise emission depends on the permeability of the insert. At higher frequencies, noise is scattered from upstream the trailing edge independently of the test case, in agreement with the roughness-generated noise assumption.Aircraft Noise and Climate EffectsWind EnergyNovel Aerospace Material
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