Um Modelo híbrido para previsão de curvas de produção de petróleo

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior

Pedagogia Freinet: a construção de uma práxis em turmas de 5ª a 8ª séries

Ce travail que nous venons de présenter apport une systématisation sur la viabilité de la praxis de l´éducateur français Célestin Freinet (1896-1996). Il s´agit d´une étude qualificative, recherche-action, développée dans une école coopérative l´ École Freinet à Natal/RN Brésil, auprès des élèves du 5ème et 8ème séries de l´Enseignement Fondamental. Le problème central que nous a amené à cette recherche, a été le fait de vérifier les progressions dans la production scientifique et dans les pratiques des enseignants qui ont à la charge l´Éducation Infantine et les premières séries de l´Enseignement Fondamental. Tout cela en tenant compte en concevoir l´élève en tant que sujet actif de son apprentissage et coresponsable à l´organisation du travail scolaire. Toutefois, qaund-il s´agit des quatre dernières séries de l´Enseignement Fondamental (5ème au 8ème séries), les propositions progressistes sont prises comme quelque chose pratiquement impossible d´en mettre en marche. Pour attenuer la lacune théorique sur le sujet, nous avons offert un texte significatif pour les enseignants d´une façon générale, les chercheurs de l´académie et pour l´écolechamp de la recherché. Tout cela par le fait de ne pas donner de priorité à une technique ou à un principe, en particulier. Cette pédagogie est discutée autant que possible dans son contexte global et aussi sur le comment s´est manifestée dans sa práxis . Nous avons mis en relief les aspects importants pour le fonctionnement de la salle de classe, aussi que les estratégies utilisées pour la construction, communication et documentation des connaissances L´intervention nous a permis de construire l´objet par la réflexion en action, à partir des données obtenues pendant les observations, les entretiens, les enterviews, les moments d´études et de la quête des textes écrits. L´analyse a été faite à la lumière de la methodologie comprehensive (Kaufmann, 1996), entrelacée au materiau empirique et à la théorie. Cette forme d´analyse nous a permis d´obtenir la logique dans l´ensemble comme nous crayons que doit caracteriser la recherche aux Sciences Humaines et Sociales. Les considérations finales mettent l´accent d´un côté sur l´efficacité de la pédagogie Freinet, pour orienter le processus de l´enseignement apprentissage, en tous les dégres de l´enseignement et de l´autre côté nous montre la nécessité urgente de l´équipe de l´école champ de la recherche, de qualifier sa pratique à partir des références théoriques-pratiques de la pédagogie Freinet

Reflexões sobre a construção e evolução de conceitos geométricos nas séries intermediárias do ensino fundamental

This thesis represents a didactic research linked to the Post-graduation Programme in Education of the Universidade Federal do Rio Grande do Norte which aimed to approach the construction of the geometrical concepts of Volume of the Rectangular Parallelepiped, Area and Perimeter of the Rectangle adding a study of the Area of the Circle. The research was developed along with students from the 6th level of the Elementary School, in a public school in Natal/RN. The pedagogical intervention was made up of three moments: application of a diagnostic evaluation, instrument that enabled the creation of the teaching module by showing the level of the geometry knowledge of the students; introduction of a Teaching Module by Activities aiming to propose a reflexive didactic routing directed to the conceptual construction because we believed that such an approach would favor the consolidation of the learning process by becoming significant to the apprentice, and the accomplishment of a Final Evaluation through which we established a comparison of the results obtained before and after the teaching intervention. The data gathered were analyzed qualitatively by means of a study of understanding categories of mathematical concepts, in addition to using descriptive statistics under the quantitative aspect. Based on the theory of Richard Skemp, about categorization of mathematical knowledge, in the levels of Relational and Instrumental Understanding were achieved in contextual situations and varied proportions, thus enabling a contribution in the learning of the geometrical concepts studied along with the students who took part in the research. We believe that this work may contribute with reflections about the learning processes, a concern which remained during all the stages of the research, and also that the technical competence along with the knowledge about the constructivist theory will condition the implementation of a new dynamics to the teaching and learning processes. We hope that the present research work may add some contribution to the teaching practice in the context of the teaching of Mathematics for the intermediate levels of the Elementary School

Sistemas computacionais espaço-temporais para toma de decisão em questões ambientais relacionadas à indústria de petróleo e gás

The area between São Bento do Norte and Macau cities, located in the northern coast of the Rio Grande do Norte State is submitted to intense and constant processes of littoral and aeolian transport, causing erosion, alterations in the sediments balance and modifications in the shoreline. Beyond these natural factors, the human interference is huge in the surroundings, composed by sensitive places, due to the existence of the Guamaré Petroliferous Pole, RN, the greater terrestrial oil producing in Brazil, besides the activities of the salt companies and shrimp farms. This socioeconomic-environmental context justifies the elaboration of strategies of environmental monitoring of that coastal area. In the environmental monitoring of coastal strips, submitted to human impacts, the use of multi-sources and multitemporal data integrated through a Spatio- Temporal Database that allows the multiuser friendly access. The objective was to use the potential of the computational systems as important tools the managers of environmental monitoring. The stored data in the form of a virtual library aid in making decisions from the related results and presented in different formats. This procedure enlarges the use of the data in the preventive attendance, in the planning of future actions and in the definition of new lines of researches on the area, in a multiscale approach. Another activity of this Thesis consisted on the development of a computational system to automate the process to elaborate Oil-Spill Environmental Sensitivity Maps, based on the temporal variations that some coastal ecosystems present in the sensibility to the oil. The maps generated in this way, based on the methodology proposed by the Ministério do Meio Ambiente, supply more updated information about the behavior of the ecosystem, as a support to the operations in case of oil spill. Some parameters, such as the hydrodynamic data, the declivity of the beach face, types of resources in risk (environmental, economical, human or cultural) and use and occupation of the area are some of the essential basic information in the elaboration of the sensitivity maps, which suffer temporal alterations.In this way, the two computational systems developed are considered support systems to the decision, because they provide operational subsidies to the environmental monitoring of the coastal areas, considering the transformations in the behavior of coastal elements resulting from temporal changes related the human and/or natural interference of the environment

Padrões temporais e grau de diversificação cariotípica em espécies atlânticas da família Acanthuridae (Perciformes)

The Acanthuridae family is a representative group from the marine fish that plays a key role in ecological dynamics of coral reefs. Three species are common along coastal reefs of Western Atlantic: Acanthurus coeruleus, Acanthurus bahianus and Acanthurus chirurgus. In the present study, cytogenetic data are presented for these three species Acanthurus based on classical cytogenetic methods and mapping of repetitive sequences such as ribosomal 18S and 5S rDNA and telomeric repeats to improve their karyotype evolutionary analyses. The cytogenetic pattern of these species indicated sequential steps of chromosomal rearrangements dating back 19 to 5 millions of years ago (M.a.) that accounted for their interspecific differences. A. coeruleus (2n=48; 2sm+4st+42a), A. bahianus (2n=36; 12m+2sm+4st+18a) and A. chirurgus (2n=34; 12m+2sm+4st+16a) share an older set of three chromosomal pairs that were originated through pericentric inversions. A set of six large metacentric pairs formed by Robertsonian (Rb) translocations found in A. bahianus and A. chirurgus and a putative in tandem fusion found in A. chirurgus are more recent events. The lack of interstitial telomeric sequences (ITS) in spite of several centric fusions in A. bahianus and A. chirurgus might be related to the long period of time after their occurrence (estimated in 5 M.a.). Furthermore, the homeologies among the chromosome pairs bearing ribosomal genes, in addition to other structural features, highlight large conserved chromosomal regions in the three species. Our findings indicate that macrostructural changes occurred during the cladogenesis of these species were not followed by conspicuous microstructural rearrangements in the karyotypes.