Romero y Hobsbawm

La aparición de libros en español tales como El siglo XX de Eric J. Hobsbawm y la reedición de La crisis del Mundo Burgués de José Luis Romero, nos puso nuevamente en contacto con dos textos que poseen una sintonía notable. En el presente artículo se pretende ver cuales son los mundos descriptos por estos prestigiosos historiadores que son los mismos y distintos a la vez, en donde la erudición y la vivencia se convierten en dos instrumentos claves a la hora de observar sus interrogantes y respuestas sobre el pasado reciente.

Romero y Hobsbawm

La aparición de libros en español tales como El siglo XX de Eric J. Hobsbawm y la reedición de La crisis del Mundo Burgués de José Luis Romero, nos puso nuevamente en contacto con dos textos que poseen una sintonía notable. En el presente artículo se pretende ver cuales son los mundos descriptos por estos prestigiosos historiadores que son los mismos y distintos a la vez, en donde la erudición y la vivencia se convierten en dos instrumentos claves a la hora de observar sus interrogantes y respuestas sobre el pasado reciente.

Romero y Hobsbawm

La aparición de libros en español tales como El siglo XX de Eric J. Hobsbawm y la reedición de La crisis del Mundo Burgués de José Luis Romero, nos puso nuevamente en contacto con dos textos que poseen una sintonía notable. En el presente artículo se pretende ver cuales son los mundos descriptos por estos prestigiosos historiadores que son los mismos y distintos a la vez, en donde la erudición y la vivencia se convierten en dos instrumentos claves a la hora de observar sus interrogantes y respuestas sobre el pasado reciente.

Climatological observations from ship logbooks between 1750 and 1854 (release 2.1)

The Climatological Database for the World's Oceans: 1750-1854 (CLIWOC) project, which concluded in 2004, abstracted more than 280,000 daily weather observations from ships' logbooks from British, Dutch, French, and Spanish naval vessels engaged in imperial business in the eighteenth and nineteenth centuries. These data, now compiled into a database, provide valuable information for the reconstruction of oceanic wind field patterns for this key period that precedes the time in which anthropogenic influences on climate became evident. These reconstructions, in turn, provide evidence for such phenomena as the El Niño-Southern Oscillation and the North Atlantic Oscillation. Of equal importance is the finding that the CLIWOC database the first coordinated attempt to harness the scientific potential of this resource represents less than 10 percent of the volume of data currently known to reside in this important but hitherto neglected source.

A parallel implementation of 3D Zernike moment analysis

Zernike polynomials are a well known set of functions that find many applications in image or pattern characterization because they allow to construct shape descriptors that are invariant against translations, rotations or scale changes. The concepts behind them can be extended to higher dimension spaces, making them also fit to describe volumetric data. They have been less used than their properties might suggest due to their high computational cost. We present a parallel implementation of 3D Zernike moments analysis, written in C with CUDA extensions, which makes it practical to employ Zernike descriptors in interactive applications, yielding a performance of several frames per second in voxel datasets about 2003 in size. In our contribution, we describe the challenges of implementing 3D Zernike analysis in a general-purpose GPU. These include how to deal with numerical inaccuracies, due to the high precision demands of the algorithm, or how to deal with the high volume of input data so that it does not become a bottleneck for the system.

Bond Modelling of prestressed concrete during the prestressing force release

This paper presents an analytical model for simulating the bond between steel and concrete, in precast prestressed concrete elements, during the prestressing force release. The model establishes a relationship between bond stress, steel and concrete stress and slip in such concrete structures. This relationship allows us to evaluate the bond stress in the transmission zone, where bond stress is not constant, along the whole prestressing force release process. The model is validated with the results of a series of tests and is extended to evaluate the transmission length. This capability has been checked by comparing the transmission length predicted by the model and one measured experimentally in a series of tests.

Probabilistic Atlas Based Segmentation Using Affine Moment Descriptors and Graph-Cuts

We show a procedure for constructing a probabilistic atlas based on affine moment descriptors. It uses a normalization procedure over the labeled atlas. The proposed linear registration is defined by closed-form expressions involving only geometric moments. This procedure applies both to atlas construction as atlas-based segmentation. We model the likelihood term for each voxel and each label using parametric or nonparametric distributions and the prior term is determined by applying the vote-rule. The probabilistic atlas is built with the variability of our linear registration. We have two segmentation strategy: a) it applies the proposed affine registration to bring the target image into the coordinate frame of the atlas or b) the probabilistic atlas is non-rigidly aligning with the target image, where the probabilistic atlas is previously aligned to the target image with our affine registration. Finally, we adopt a graph cut - Bayesian framework for implementing the atlas-based segmentation.