Navegando por Assunto "Description"

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Caracterização de material compósito incorporado com fibras de bambu (Bambusa Vulgaris) e resíduos sólidos industriais para utilizacao como componente estrutural para a construcao civil
(Universidade Federal do Pará, 2020-03-12) SANTOS, Alessandro José Gomes dos; SOUZA, José Antônio da Silva; http://lattes.cnpq.br/6157348947425968
In the industry, the production of materials that bring less environmental impacts and that have high sustainability has been growing, mainly with regard to vegetable fibers and industrial waste. In this work, full isophthalic unsaturated polyester matrix, composites with bamboo vegetable fiber, composites with industrial residues (red mud, kaolin and copper) and hybrid composites with variation in the proportion of residues and fibers were made. The residues were used with granulometry of 100 MESH and the fibers in the lengths of 15mm and 30 mm, randomly arranged within the matrix. These fibers were used in natura and treated with 5% NaOH during the period of 2 (two) hours. The fibers were characterized in terms of their physical, mechanical and morphological properties. The composites were made by hand (hand lay-up) in the form of rectangular plates in metallic mold and pressed. The proportions of the mass fractions of the residues varied by 10%, 20%, 30% and 40%, whereas the mass fraction of fibers was varied by 1%, 2% and 3%. For the production of hybrid composites, the variation occurred up to the maximum saturation level of the matrix, with the proportion of residues / fibers of 10% / 3%, 20% / 3%, 30% / 3% and 40% / 3%, respectively. Bamboo fibers were chemically characterized by analyzing the levels of extractives, lignin and holocellulose. The residues were characterized mineralogically by means of X-Ray Diffraction (XRD). The composites were characterized physically (apparent porosity, water absorption and apparent specific mass), mechanically (traction, flexion and impact), flame retardancy and morphologically through Scanning Electron Microscopy (SEM) analysis. For physical characterization analyzes, 10 specimens (CP’s) were produced for each series. In the mechanical tests, 10 CP's were manufactured for the tensile tests, while for the flexion and impact tests, there were 8 CP's for each series. This same amount was used for the flame retardancy tests. After the physical tests, a small variation was observed with the addition of fibers and an increase in the Apparent Specific Mass with the addition of residues and fibers in the matrix. In the analysis by means of mechanical traction characterization, the best results of resistance limits in the values of 33.05 MPa were obtained for composites with 3% bamboo fibers treated with 15 mm in length and 33.11 MPa with bamboo fibers 30mm long without treatment. With the incorporation of waste, it reached a value of 40.25 MPa. In hybrid fractions the value reached 41.07 MPa with the addition of 20% kaolin residue / 3% bamboo fibers in the 15mm lengths with treatment. In flexion tests, the results were 150.94 MPa for the addition of treated 30mm fibers, 140.34 MPa for the addition of 20% kaolin residue and in the hybrids of 137.27 MPa for the addition of 30% kaolin residue / 3% bamboo fibers with 30mm treated. In the impact tests, the best results were 23.02 kJ / m² for the addition of 10% copper residue and 38.56 kJ / m² for the addition of 20% copper residue / 3% bamboo fibers with 30 mm long treated.
Acesso aberto (Open Access)
A descrição como recurso textual-discursivo na produção escrita de alunos; proposta didática para o Ensino Fundamental
(Universidade Federal do Pará, 2020-03-30) SILVA, Clara Maria Mesquita; ABDON, Iaci de Nazaré Silva; http://lattes.cnpq.br/2212976917586395
This work has as its theme the description as a textual discursive resource in the students’ written production. It is worth noting in this study the fact that the description, as a resource of textual composition, contributes to the coherence and it fits to the argumentativeness. Students find it difficult to operate / write descriptive sequences with an argumentative / expressive value. And the description constitutes a daily sociodiscursive demand. Considering these points, this research asked: what knowledge do students have regarding the use of descriptive sequences? It aimed to design and carry out a didactic proposal - partially based on Lopes-Rossi (2011; 2006) - composed of activities that analyzed the description as a textual / discursive resource, aiming at the development / improvement of the students' descriptive competence. Methodologically, this work was guided by the processes of research-action. A descriptive / exploratory analysis was made of how the textbooks, from three collections of Portuguese Language, intended for the final grades of Elementary School, didactically approach the typology description. It was analyzed, diagnostically, if the students researched add descriptive sequences to their texts / tales. If so, how do they proceed? Then, the proposal was applied and the results analyzed, observing the new texts / tales written by the students. This work is substantiated on the theoretical constructions of Textual Linguistics, concerning the text and the fact that textuality is the result of the connection between linguistic and non-linguistic factors; and the interactional conception of language when dealing with the writing process - (KOCH 2017; 2016); Marcuschi (2010; 2012); Antunes (2010); and Bronckart (1999). And, above all, it is guided by exposures of Marquesi (1995; 2007; 2011; 2017) concerning the formulation of a theory to the descriptive superstructure and to the linguistic-discursive specificities of this typological sequence. In the process of the research, it was identified that, predominantly, the activities suggested by textbooks cover the description superficially, out of the contexts, or as a pretence for metalanguage. The results obtained after the implementation of the didactic proposal showed a relative progression of the constructed descriptions. The students showed progress in the development of coherently draining the characteristics highlighted by the descriptions made. Therefore, they made descriptive utterance favorable to the semantic / thematic progression of their tales. They already outline skills for building more creative, more complex descriptions: which move from the level of concrete operations to the level of logical operations, through the use of stylistic resources. It is evaluated, therefore, that undertaking teaching strategies in which the description typology is studied - considering its discursive, argumentative and expressive function - can contribute to the improvement of the students' ability to create verbal images coherent with specific goals (revealing the profile of a character, producing cryptic clues, creating suspense ...).
Acesso aberto (Open Access)
Representação da informação em arquivos e bibliotecas: uma reflexão a respeito dos elementos descritivos das Normas ISAD (G) e AACR2
(Universidade Federal do Pará, 2020-03-24) MONTEIRO, Glenda da Rocha; BARROS, Thiago Henrique Bragato; http://lattes.cnpq.br/0339496971217162; https://orcid.org/0000-0001-7439-5779
This research addresses the theme of information representation in Archives and Libraries from the analysis of the descriptive elements pointed out in the ISAD (G) standards and in the first chapter of AACR2. The main question for the elaboration of this research is: do the standards for archival description and cataloging of libraries dialogue with respect to the descriptive process? Based on this question, the general objective of this work is to identify and present the convergent and divergent points of information representation in archives and libraries based on the rules of archival description and library cataloging. Specific objectives are also to present the archival description and the representation of information in libraries as representation processes; categorize the descriptive elements found in ISAD (G) and AACR2 and compare these elements. This work observes, in particular, the descriptive items presented by the two manuals according to the categories established through Content Analysis, a methodology established for the development of the analysis of the two standards. It can be seen within the context presented, the trajectory of the description and cataloging processes until the conception of the principles considered fundamental for the development of internationally recognized standards and it is also noted that the Representation of information in Archives and Libraries is linked to processes which demand intellectual work from the professionals involved and have as their main objectives the possibility of organization and access to information. The Analysis of the Standards emonstrates the aspects regarding the texts of each one, going from the general context of both of them to the descriptive items occasionally found and lists them within the established categories, highlighting the similarities of elements considered essential for the development of descriptions. Finally, it considers that the two areas dialogue both in terms of processes and in the structural parameters of content to be applied by their descriptive standards and what should be reflected in their results.