994 resultados para Merian, Matthaeus, 1593-1650


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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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¿Cómo consideraba la administración madrileña, es decir el Consejo de Indias, los espacios urbanos y rurales en América? A partir de fuentes clásicas (las Ordenanzas de 1573 y las Relaciones geográficas de 1577) e inéditas (la obra y los papeles del oficial del Consejo de Indias, Juan Díez de la Calle), entendemos la importancia de la ciudad como lugar de dominación sobre el campo y de implantación del poder real gracias a la presencia de los representantes de la Corona designados en Madrid. La ciudad, con sus oficiales y sus eclesiásticos, es fuente de obsesión, mientras que el campo, en un segundo plano, es visto simplemente como fuente de recursos

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Este trabajo intenta resignificar el rol de la elite porteña en la economía ganadera durante el período 1650-1750. Evalúa el impacto de la apertura ultramarina en la estructura agraria y su correlato en el desempeño del sector terrateniente. Analiza la matriz productiva del comercio exterior y el peso de los bienes pecuarios en los patrones de acumulación. Enfatiza la función estratégica de las Salinas de la pampa y la importancia de la industria de bastimentos para la operatoria de la plaza naviera. Propone una revisión crítica de la lógica acumulativa del capital comercial