944 resultados para McDonald, Edward Francis, 1844-1892.


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As a result of intensive field activities carried out by several nations over the past 15 years, a set of accumulation measurements for western Dronning Maud Land, Antarctica, was collected, based on firn-core drilling and snow-pit sampling. This new information was supplemented by earlier data taken from the literature, resulting in 111 accumulation values. Using Geographical Information Systems software, a first region-wide mean annual snow-accumulation field was derived. In order to define suitable interpolation criteria, the accumulation records were analyzed with respect to their spatial autocorrelation and statistical properties. The resulting accumulation pattern resembles well known characteristics such as a relatively wet coastal area with a sharp transition to the dry interior, but also reveals complex topographic effects. Furthermore, this work identifies new high-return shallow drilling sites by uncovering areas of insufficient sampling density.

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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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Este análisis de Cultura e imperialismo de Edward Said se concentra en sus en principio contradictorias actitudes frente a la tradición de la estética como fuente de modos de concebir las prácticas artísticas y literarias aún hoy operantes y en sus concepciones de la figura del intelectual crítico y de su labor. Las caracterizaciones, juicios y evaluaciones de Said a propósito de diversos intelectuales poscoloniales más o menos contemporáneos permiten dar cuenta críticamente de su análisis de la posibilidad de 'restaurar' el universalismo constitutivamente emancipatorio de las prácticas culturales y de la labor del intelectual (o, al menos, de sus aspectos rescatables tras un análisis profundo de los compromisos entre cultura europea e imperialismo desde principios del siglo XIX hasta fines del XX). Para esto, se presta atención a sus conclusiones respecto de las variantes específicamente académicas de la 'política de identidades', al menos tal como se dieron en el marco de las universidades de la órbita angloparlante. En última instancia, todo se dirige al planteo de la cuestión de si el privilegio, por parte de Said, de los aspectos heterogeneizantes y dislocadores de la crítica de la cultura es positivamente compatible con su pretensión de 're-universalización' y 'secularización' radical de la labor del intelectual, y con la constitución posible de instancias de agenciamiento transformador más allá del plano de las diversas políticas nacionales o nacionalistas.

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En 1892, un grupo de hombres de letras decidió llevar adelante un proyecto de redefinición de la literatura nacional. El lugar de origen de este proyecto eran las tertulias literarias presididas por Rafael Obligado y su objetivo, recuperar el lugar perdido por las letras ante la ampliación y diversificación del espacio público. En este artículo, los hechos y las motivaciones que dieron lugar a la fundación del Ateneo se analizan como los signos iniciales de un proceso de largo alcance en la configuración de literatura argentina moderna, a partir de la identificación de una alianza entre un grupo de letrados y el periodismo porteño del fin de siglo