962 resultados para Rodrigo, Maese, 1444-1509.


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Aims. We study the link between gravitational slopes and the surface morphology on the nucleus of comet 67P/Churyumov-Gerasimenko and provide constraints on the mechanical properties of the cometary material (tensile, shear, and compressive strengths). Methods. We computed the gravitational slopes for five regions on the nucleus that are representative of the different morphologies observed on the surface (Imhotep, Ash, Seth, Hathor, and Agilkia), using two shape models computed from OSIRIS images by the stereo-photoclinometry (SPC) and stereo-photogrammetry (SPG) techniques. We estimated the tensile, shear, and compressive strengths using different surface morphologies (overhangs, collapsed structures, boulders, cliffs, and Philae's footprint) and mechanical considerations. Results. The different regions show a similar general pattern in terms of the relation between gravitational slopes and terrain morphology: i) low-slope terrains (0-20 degrees) are covered by a fine material and contain a few large (>10 m) and isolated boulders; ii) intermediate-slope terrains (20-45 degrees) are mainly fallen consolidated materials and debris fields, with numerous intermediate-size boulders from <1m to 10m for the majority of them; and iii) high-slope terrains (45-90 degrees) are cliffs that expose a consolidated material and do not show boulders or fine materials. The best range for the tensile strength of overhangs is 3-15 Pa (upper limit of 150 Pa), 4-30 Pa for the shear strength of fine surface materials and boulders, and 30-150 Pa for the compressive strength of overhangs (upper limit of 1500 Pa). The strength-to-gravity ratio is similar for 67P and weak rocks on Earth. As a result of the low compressive strength, the interior of the nucleus may have been compressed sufficiently to initiate diagenesis, which could have contributed to the formation of layers. Our value for the tensile strength is comparable to that of dust aggregates formed by gravitational instability and tends to favor a formation of comets by the accrection of pebbles at low velocities.

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Aims. We report on the first major temporal morphological changes observed on the surface of the nucleus of comet 67P/Churyumov-Gerasimenko in the smooth terrains of the Imhotep region. Methods. We used images of the OSIRIS cameras onboard Rosetta to follow the temporal changes from 24 May 2015 to 11 July 2015. Results. The morphological changes observed on the surface are visible in the form of roundish features that are growing in size from a given location in a preferential direction at a rate of 5.6-8.1 x 10(-5) m s(-1) during the observational period. The location where the changes started and the contours of the expanding features are bluer than the surroundings, which suggests that ices (H2O and/or CO2) are exposed on the surface. However, sublimation of ices alone is not sufficient to explain the observed expanding features. No significant variations in the dust activity pattern are observed during the period of changes.

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An integrated instrument package for measuring and understanding the surface radiation budget of sea ice is presented, along with results from its first deployment. The setup simultaneously measures broadband fluxes of upwelling and downwelling terrestrial and solar radiation (four components separately), spectral fluxes of incident and reflected solar radiation, and supporting data such as air temperature and humidity, surface temperature, and location (GPS), in addition to photographing the sky and observed surface during each measurement. The instruments are mounted on a small sled, allowing measurements of the radiation budget to be made at many locations in the study area to see the effect of small-scale surface processes on the large-scale radiation budget. Such observations have many applications, from calibration and validation of remote sensing products to improving our understanding of surface processes that affect atmosphere-snow-ice interactions and drive feedbacks, ultimately leading to the potential to improve climate modelling of ice-covered regions of the ocean. The photographs, spectral data, and other observations allow for improved analysis of the broadband data. An example of this is shown by using the observations made during a partly cloudy day, which show erratic variations due to passing clouds, and creating a careful estimate of what the radiation budget along the observed line would have been under uniform sky conditions, clear or overcast. Other data from the setup's first deployment, in June 2011 on fast ice near Point Barrow, Alaska, are also shown; these illustrate the rapid changes of the radiation budget during a cold period that led to refreezing and new snow well into the melt season.

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La influencia de los medios visuales y las nuevas tecnologías en el arte, la literatura y la comunicación, nos conduce al problema de las relaciones entre la palabra y la imagen. Considerando las puestas del dramaturgo hispano argentino Rodrigo García, nos preguntamos por la influencia de las artes plásticas en su performance; identificando la influencia de la obra de Bruce Nauman, reflexionamos acerca de los vínculos entre imagen y texto identificando la confluencia de estéticas provenientes de distintos sistemas artísticos, y señalamos finalmente la importancia de la representación del cuerpo, en relación con el exceso y la abyección, en las nuevas poéticas contemporáneas

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Nacido en la Argentina, pero radicado en España a fines de los ochenta, Rodrigo García se ha convertido a lo largo de estas últimas décadas en uno de los principales animadores del teatro emergente español y en uno de los rostros más visibles de la escena española fuera de la Península. Su práctica de la escritura y de la dirección (de la escritura al servicio de la dirección y de la materialidad de la escena) es resultado de los modelos de producción más legitimados en los últimos tiempos, una vez ganada la batalla contra la concepción literaria del teatro. Sus obras suponen una puesta al día de los anticonvencionalismos y las provocaciones de la Posvanguardia. Luego de una presentación de los principios fundamentales de la poética de Rodrigo García, mi trabajo se centrará en La historia de Ronald, el payaso de McDonald's con el fin de indagar, fundamentalmente, los procedimientos que tienden a instaurar lo real en medio de la representación escénica. De ellos, derivan una serie de planteos conceptuales y de tensiones entre lo representativo y lo performativo, las acciones simbólicas y las acciones reales, el espectáculo y la fiesta, que contribuyen a repensar la autonomía del arte

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Según el Cantar de Mio Cid, Rodrigo Díaz de Vivar desarrolló una extraordinaria carrera como señor de la guerra durante su exilio. Empero, tras conquistar Valencia y el perdón de su rey, el Cid prácticamente detuvo sus campañas militares y comenzó a vivir como un señor feudal. Este artículo revisa la evolución del Cid a lo largo del Cantar e intenta descubrir sus razones.

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Fil: Focás, Brenda. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación. Instituto de Investigaciones en Humanidades y Ciencias Sociales (UNLP-CONICET); Argentina.

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Según el Cantar de Mio Cid, Rodrigo Díaz de Vivar desarrolló una extraordinaria carrera como señor de la guerra durante su exilio. Empero, tras conquistar Valencia y el perdón de su rey, el Cid prácticamente detuvo sus campañas militares y comenzó a vivir como un señor feudal. Este artículo revisa la evolución del Cid a lo largo del Cantar e intenta descubrir sus razones.