991 resultados para Vergara, Telmo, 1909-1967, Estrada perdida


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Fil: Lucero, Ignacio.

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Una búsqueda de pulgones sobre especies de Pinus se realizó en diferentes provincias de la Argentina. La identificación del material colectado permite citar por primera vez para este país Essigella californica (Essig), hallado en cinco provincias. Se presentan aspectos biológicos y morfológicos que permiten separar los tres géneros de la tribu Eulachnini (subfamilia Lachninae) presentes ahora en la Argentina: Cinara, Eulachnus y Essigella

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El artículo aborda la constitución y despliegue de la Comisión de Desarrollo Urbano y Regional de CLACSO en tanto red regional entre 1967 y 1973. En el marco de disputas entre distintos saberes expertos sobre la ciudad, se abordará cómo la Comisión replantea las relaciones entre planificación urbana y regional y ciencias sociales y, en términos más amplios, los vínculos entre técnica y política. Asimismo, como parte de la construcción de objetos de investigación trasnacionales, se analiza su intento de construir una programa latinoamericano sobre la investigación urbana y regional y cómo contactos previos construidos en universidades norteamericanas son reutilizados por integrantes de la comisión a los fines de expandirse y acceder a financiamiento. Finalmente, se indica cómo acontecimientos políticos en la región impactan sobre la comisión rearticulando su organización. El artículo se apoya en el análisis de fuentes primarias y secundarias.

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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.