Cursos superiores de tecnologia do IFRN – uma análise epistemológica do currículo

Atas do XI Colóquio sobre Questões Curriculares, VII Colóquio Luso-Brasileiro & I Colóquio Luso-Afro-Brasileiro de Questões CurricularesO presente trabalho enquadra-se numa pesquisa em curso no âmbito do doutoramento em Ciências da Educação, na especialidade de Desenvolvimento Curricular. Um dos objetivos da pesquisa é sistematizar e ampliar conhecimentos sobre as bases curriculares dos cursos de tecnologia e problematizar o currículo do ensino superior, considerando o atual contexto social demarcado por complexidades, incertezas e permanentes mudanças. Trata-se de um estudo de natureza qualitativa em que a pesquisa documental é uma das fontes para a recolha de dados. Nesta comunicação incide-se nalguns resultados de uma investigação bibliográfica acerca do currículo dos cursos de tecnologia do IFRN, enfocando o estudo das bases epistemológicas do desenho curricular dos cursos de graduação tecnológica reformulados a partir de 2009 e implementados, na Instituição, em 2012. A primeira parte trata da caracterização e contextualização dos cursos tecnológicos no IFRN, situando-os historicamente e acerca das bases conceituais e metodológicas orientadoras das revisões curriculares do atual contexto institucional. A segunda parte apresenta uma descrição e análise dos princípios organizadores da proposta curricular desses cursos no IFRN, as implicações didáticas e suas articulações com as necessidades formativas dos docentes do ensino superior. Desse modo, espera-se refletir a respeito da proposta curricular dos cursos de graduação tecnológica, a partir da compreensão de uma formação superior integral e produtora de sentidos no âmbito da formação humana, pessoal e profissional, tanto na perspectiva de docentes, quanto de discentes. Visa ainda, ampliar o conhecimento a respeito da concepção e do desenvolvimento curricular nos cursos de graduação tecnológica e contribuir com sistematizações teórico metodológicas que venham a fortalecer o ensino superior e a atuação docente nesse campo de formação. Em síntese, ao se estabelecer relações entre a epistemologia dos conhecimentos teóricos e a epistemologia dos saberes da prática, o estudo busca sistematizar contributos para a construção de uma nova pedagogia universitária.Fundação para a Ciência e a Tecnologia (FCT

Integrating a QPSK Quantum Key Distribution Link

We present the integration of the optical and electronic subsystems of a BB84-QKD fiber link. A highspeed FPGA MODEM generates the random QPSK sequences for a fiber-optic delayed self-homodyne scheme using APD detectors.Comment: 2 pages, 4 figures, European Conference on Optical Communication 200

Association of radio polar cap brightening with bright patches and coronal holes

Radio-bright regions near the solar poles are frequently observed in Nobeyama Radioheliograph (NoRH) maps at 17 GHz, and often in association with coronal holes. However, the origin of these polar brightening has not been established yet. We propose that small magnetic loops are the source of these bright patches, and present modeling results that reproduce the main observational characteristics of the polar brightening within coronal holes at 17 GHz. The simulations were carried out by calculating the radio emission of the small loops, with several temperature and density profiles, within a 2D coronal hole atmospheric model. If located at high latitudes, the size of the simulated bright patches are much smaller than the beam size and they present the instrument beam size when observed. The larger bright patches can be generated by a great number of small magnetic loops unresolved by the NoRH beam. Loop models that reproduce bright patches contain denser and hotter plasma near the upper chromosphere and lower corona. On the other hand, loops with increased plasma density and temperature only in the corona do not contribute to the emission at 17 GHz. This could explain the absence of a one-to-one association between the 17 GHz bright patches and those observed in extreme ultraviolet. Moreover, the emission arising from small magnetic loops located close to the limb may merge with the usual limb brightening profile, increasing its brightness temperature and width.Comment: 8 pages, 6 figures, 1 table. Accepted for publication in The Astrophysical Journa

A novel notion of null infinity for c-boundaries and generalized black holes

We give new definitions of null infinity and black hole in terms of causal boundaries, applicable to any strongly causal spacetime $(M,g)$. These are meant to extend the standard ones given in terms of conformal boundaries, and use the new definitions to prove a classic result in black hole theory for this more general context: if the null infinity is regular (i.e. well behaved in a suitable sense) and $(M,g)$ obeys the null convergence condition, then any closed trapped surface in $(M,g)$ has to be inside the black hole region. As an illustration of this general construction, we apply it to the class of generalized plane waves, where the conformal null infinity is not always well-defined. In particular, it is shown that (generalized) black hole regions do not exist in a large family of these spacetimes.Comment: 32 pages, 4 figures. Included new referenc

An entirely analytical cosmological model

The purpose of the present study is to show that in a particular cosmological model, with an affine equation of state, one can obtain, besides the background given by the scale factor, Hubble and deceleration parameters, a representation in terms of scalar fields and, more important, explicit mathematical expressions for the density contrast and the power spectrum. Although the model so obtained is not realistic, it reproduces features observed in some previous numerical studies and, therefore, it may be useful in the testing of numerical codes and as a pedagogical tool.Comment: 4 pages (revtex4), 4 figure

Qualidade sanitária de sementes de nó-de-cachorro (Heteropterys tomentosa).

bitstream/item/82283/1/CT104.pd

Hierarchical characterization of complex networks

While the majority of approaches to the characterization of complex networks has relied on measurements considering only the immediate neighborhood of each network node, valuable information about the network topological properties can be obtained by considering further neighborhoods. The current work discusses on how the concepts of hierarchical node degree and hierarchical clustering coefficient (introduced in cond-mat/0408076), complemented by new hierarchical measurements, can be used in order to obtain a powerful set of topological features of complex networks. The interpretation of such measurements is discussed, including an analytical study of the hierarchical node degree for random networks, and the potential of the suggested measurements for the characterization of complex networks is illustrated with respect to simulations of random, scale-free and regular network models as well as real data (airports, proteins and word associations). The enhanced characterization of the connectivity provided by the set of hierarchical measurements also allows the use of agglomerative clustering methods in order to obtain taxonomies of relationships between nodes in a network, a possibility which is also illustrated in the current article.Comment: 19 pages, 23 figure