14,632 research outputs found
Travel of studies: cities of João Pessoa, Maceio, Natal and Recife: a look on the urban space and brazilian architectural production
Ponencia presentada a Session 8: Dimensiones psicosociales de la arquitectura y el urbanismo / Psycological dimensions of architecture and planningThis article aims to present the methodology and the final results of the elective course “Travel of Studies” which belongs to the new pedagogical project from the Architecture and Urbanism course at the University Federal of Pernambuco. It was offered for the first time in 2013.The discipline was organized to occur in four long weekends through visits of four capitals of the Northeast of Brazil: Recife, João Pessoa, Natal and Maceió. The purpose was to allow the students to apprehend the cities through four axis: intervention in historical center (axis 1), production of urban space (axis 2), production of coastline space (axis 3) and contemporary architecture (axis 4). After the four visits were complete, we prepared a poster with the comparison of the cities based on the identification of the similarities and differences of each axis we have studied
Analytical approach to directed sandpile models on the Apollonian network
We investigate a set of directed sandpile models on the Apollonian network,
which are inspired on the work by Dhar and Ramaswamy (PRL \textbf{63}, 1659
(1989)) for Euclidian lattices. They are characterized by a single parameter
, that restricts the number of neighbors receiving grains from a toppling
node. Due to the geometry of the network, two and three point correlation
functions are amenable to exact treatment, leading to analytical results for
the avalanche distributions in the limit of an infinite system, for .
The exact recurrence expressions for the correlation functions are numerically
iterated to obtain results for finite size systems, when larger values of
are considered. Finally, a detailed description of the local flux properties is
provided by a multifractal scaling analysis.Comment: 7 pages in two-column format, 10 illustrations, 5 figure
Processing of formic acid-containing ice by heavy and energetic cosmic ray analogues
Formic acid (HCOOH) has been extensively detected in space environments,
including interstellar medium (gas and grains), comets and meteorites. Such
environments are often subjected to the action of ionizing agents, which may
cause changes in the molecular structure, thus leading to formation of new
species. Formic acid is a possible precursor of pre-biotic species, such as
Glycine (NH2CH2COOH). This work investigates experimentally the physicochemical
effects resulting from interaction of heavy and energetic cosmic ray analogues
(46MeV 58Ni11+) in H2O:HCOOH (1:1) ice, at 15 K, in ultrahigh vacuum regime,
using Fourier transform infrared spectrometry in the mid-infrared region
(4000-600 cm-1 or 2.5-12.5 microns). After the bombardment, the sample was
slowly heated to room temperature. The results show the dissociation
cross-section for the formic acid of 2.4x10^-13 cm2, and half-life due to
galactic cosmic rays of 8x10^7 yr. The IR spectra show intense formation of CO
and CO2, and small production of more complex species at high fluences
On neglected taxa: Protostomes and the evolution of myelination
Understanding the evolution of nervous and sensory systems in animals is key to understanding the distribution of animal sentience. However, the use of model organisms – mostly vertebrates, and especially mammals – often biases comparative analyses. Sneddon et al. (2018a,b) point out that using nonhuman animals as models helps us better understand the multifaceted aspects of animal pain and sentience. Several concerns need to be considered in dealing with model organisms. Here we discuss how models that are unrepresentative phylogenetically influence hypotheses about the evolution of the myelination in animals. Greater effort is needed to escape “vertebrate-centrism” in evolutionary research
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