Image processing algorithm for the identification of Martian dust devil tracks in MOC and HiRISE images

This paper presents a method for automatic identification of dust devils tracks in MOC NA and HiRISE images of Mars. The method is based on Mathematical Morphology and is able to successfully process those images despite their difference in spatial resolution or size of the scene. A dataset of 200 images from the surface of Mars representative of the diversity of those track features was considered for developing, testing and evaluating our method, confronting the outputs with reference images made manually. Analysis showed a mean accuracy of about 92%. We also give some examples on how to use the results to get information about dust devils, namelly mean width, main direction of movement and coverage per scene. (c) 2012 Elsevier Ltd. All rights reserved.

Occurrence of the bentfin devil ray, Mobula thurstoni (Chondrichthyes : Mobulidae), in the western Atlantic

This paper reports the occurrence of the fifth species of Mobula in the western Atlantic, M. thursloni, based on specimens caught by artisanal and driftnet fisheries in coastal waters off southern Brazil.

A study on automatic methods based on mathematical morphology for Martian dust devil tracks detection

This paper presents three methods for automatic detection of dust devils tracks in images of Mars. The methods are mainly based on Mathematical Morphology and results of their performance are analyzed and compared. A dataset of 21 images from the surface of Mars representative of the diversity of those track features were considered for developing, testing and evaluating our methods, confronting their outputs with ground truth images made manually. Methods 1 and 3, based on closing top-hat and path closing top-hat, respectively, showed similar mean accuracies around 90% but the time of processing was much greater for method 1 than for method 3. Method 2, based on radial closing, was the fastest but showed worse mean accuracy. Thus, this was the tiebreak factor. © 2011 Springer-Verlag.

Automated determination of the orientation of dust devil tracks in mars orbiter images

The paper presents and evaluates three methods for automatically estimating the main orientation of Martian dust devil tracks in MOC and HiRISE images. Inferring such information about dust devils from their tracks is important to better understand the near surface wind. The methods considered were based on gradient direction, directional openings and morphological granulometry. The accuracy of the methods was asserted by comparing the results to a set of directions estimated visually and assumed to be the ground truth. The higher accuracy was reached using directional openings. Besides, the directions inferred by this method were compared to those predicted by the GCM and the results agreed. © 2013 COSPAR.

Extensive computation of albedo contrast between martian dust devil tracks and their neighboring regions

We have developed a method to compute the albedo contrast between dust devil tracks and their surrounding regions on Mars. It is mainly based on Mathematical Morphology operators and uses all the points of the edges of the tracks to compute the values of the albedo contrast. It permits the extraction of more accurate and complete information, when compared to traditional point sampling, not only providing better statistics but also permitting the analysis of local variations along the entirety of the tracks. This measure of contrast, based on relative quantities, is much more adequate to establish comparisons at regional scales and in multi-temporal basis using imagery acquired in rather different environmental and operational conditions. Also, the substantial increase in the details extracted may permit quantifying differential depositions of dust by computing local temporal fading of the tracks with consequences on a better estimation of the thickness of the top most layer of dust and the minimum value needed to create dust devils tracks. The developed tool is tested on 110 HiRISE images depicting regions in the Aeolis, Argyre, Eridania, Noachis and Hellas quadrangles. As a complementary evaluation, we also performed a temporal analysis of the albedo in a region of Russell crater, where high seasonal dust devil activity was already observed before, comprising the years 2007-2012. The mean albedo of the Russell crater is in this case indicative of dust devil tracks presence and, therefore, can be used to quantify dust devil activity. (C) 2014 Elsevier Inc. All rights reserved.

Tempo e devir em convulsão: dimensões da história no cinema de Glauber Rocha (1964-1969)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Um parágrafo de história na literatura francesa: a representação do Caso Dreyfus em L'Île des pingouins, de Anatole France

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Detecção automática de rastros de Dust Devils na superfície de Marte

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

O realismo mágico nas Short Stories de Neil Gaiman, um contador de histórias da contemporaneidade

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Humor e sátira: a outra face de Edgar Allan Poe

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

O discurso sobre o mal na Igreja Universal do Reino de Deus: uma história cultural do diabo no Brasil contemporâneo (1977-2005)

Pós-graduação em História - FCLAS

As metamorfoses do diabo na modernidade: a secularização do mito e sua apropriação pela indústria cultural no século XX

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

A Sonata de Deus e o diabolus: nacionalismo, música e o pensamento social no cinema de Glauber Rocha

Pós-graduação em Ciências Sociais - FFC

Patologias sociais contemporâneas: os paradoxos da modernidade na sociedade brasileira do século XXI e a luta social contra a figura do diabo

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Sistema jagunço: localismo e universalismo em Grande sertão : veredas

Under different perspectives of interpretation and analysis, the notions of localism and universalism in the fictional production of Guimarães Rosa have been strongly explored by the criticism, especially in Grande sertão: veredas [The devil to pay in the backlands], in which these two dimensions – overlapped and complementary – become more intricate and profuse. Taking the analytical line of historical, social and political dimensions of the novel for granted – not regarding it as an essay or strict allegory of the country – the present study proposes a new reading of the composition with the interpretation of the articulation of these two dimensions in the forming of the “jagunço system” (ROSA, 1970, p.391), that is a concept created by Guimarães Rosa and which transcends the historical and sociological reality. The articulation of the social, political and cultural elements figure in Guimarães Rosa’s fiction and becomes an issue for wider debates and reflections, so that the particular element of the novel enables a universal survey. Based on diverse critical apprehensions of the novel, this paper aims to investigate the levels of the literary composition in which the local-universal articulation associated with the representation of the jagunço is constructed. In order to do that, the theoretical study is based on three dimensions of studies: a) critical essays about Guimarães Rosa, the totality of his work and specific critical essays about Grande sertão: veredas [The devil to pay in the backlands] and the “jagunço system”, b) theoretical apparatus concerning the history, the politics and the Brazilian culture related to the cangaço; and c) theoretical subsidies for the study of the narrative