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Search Results: 1 - 10 of 22530 matches for " Pedro Ivo Silveira Andretta "
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Olhares enunciativos no discurso literário: uma análise das capas de "Dom Casmurro"
Gaspar, Nádea Regina;Andretta, Pedro Ivo Silveira;
Linguagem em (Dis)curso , 2011, DOI: 10.1590/S1518-76322011000300004
Abstract: the aim of this study is to understand how the written content of a literary text is represented in the cover images that illustrate it, considering its various editions in order to identify discursive statements through the relationship between statements in the verbal text and in the non-verbal covers. this is to ascertain as to how the statements found in this relationship originated and developed into a certain discourse on the text, since covers function in the domain of "knowledge", differentiating itself from the written narrative, which operates as a raw material of literary science. for that, we resort to the archaeological theory of michel foucault (2008), in his interpretation of "statement", "discursive formation", "science and knowledge", casting our gaze upon a series of covers around the various editions of the work "dom casmurro," by machado de assis, which were published in the xx and xxi centuries. as a result, some statements were identified that formed a discourse in the text and on the covers about "the feminine gaze".
El blog como fuente de información: consideraciones sobre InfoBCI
Pedro Ivo Silveira Andretta,Jo?o Paulo Borges da Silveira,Eduardo Graziosi Silva,Renan Carvalho Ramos
Simbiosis : Revista Electrónica de Ciencias de la Información , 2012,
Abstract: La Web 2.0 posibilitó tanto el desarrollo de espacios interactivos entre usuarios como la rápida diseminación y evaluación de contenidos. En este contexto, se pretende entender a los blogs y en particular el blog InfoBCI, un servicio de información que ofrece a sus usuarios acceso a la reciente producción de artículos del área de Ciencia de la Información. Aquí serán abordados aspectos de su arquitectura, uso y repercusión. Se concluye que los blogs pueden ser una herramienta eficiente para favorecer la diseminación y divulgación científica. En este sentido, iniciativas como la del blog InfoBCI pueden ser fácilmente implementadas, sirviendo como una significativa fuente de información.
Use of Corrosion Inhibitor in Solid Form to Prevent Internal Corrosion of Pipelines and Acidification Process  [PDF]
Fernando B. Mainier, Pedro Ivo Canesso Guimar?es
Journal of Materials Science and Chemical Engineering (MSCE) , 2014, DOI: 10.4236/msce.2014.25001

Use of corrosion inhibitors in solid form promotes the development of a new technique for internal corrosion protection of oil & gas pipelines and operations of oil wells acidification, because the controlled dissolution of the corrosion inhibitor forms a surface on metallic parts, a protective film that prevents or minimizes undesirable reactions to corrosion. In addition, this technique has important social and environmental benefits, ensures the operator has a lower risk of contamination when handling the product, changes the type of industrial packing, facilitates transportation, reduces solvent use and consequently reduces the waste that normally results from the use of inhibitors. The purpose of this article is to present a class of solid corrosion inhibitor tested in the laboratory and offer proposals for its application in industrial pipes such as gas and oil pipelines.

Estudo da influência dos iniciadores na polimeriza??o da 2-fenil-2-oxazolina
Guimar?es, Pedro Ivo C.;
Polímeros , 2000, DOI: 10.1590/S0104-14282000000400010
Abstract: 2-phenyl-2-oxazoline was polymerized using methyl iodide, methyl tosilate, etherate boron trifluorated, dimethyl, diethyl and di-sec-butyl sulphate as initiators. the main aim of this work was to study the influence of type of initiator on the initiation and propagation processes as well the reactional conditions of these polymerizations. the polymerizations results showed that the nucleophilicity of initiator and different alkyl groups present in the dialkyl sulphates affect the initiation reaction, and influence the propagation species due to the counteranion effect, derived from these initiators. the dialkyl sulphates investigated exhibited good initiator efficiency and their performances were close.
Estudo da influência dos iniciadores na polimeriza o da 2-fenil-2-oxazolina
Guimar?es Pedro Ivo C.
Polímeros , 2000,
Abstract: 2-Fenil-2-oxazolina foi polimerizada utilizando-se iodeto de metila, tosilato de metila, eterato de trifluoreto de boro e sulfatos de dimetila, dietila e di-sec-butila como iniciadores. Este trabalho visa estudar a influência do tipo de iniciador nos processos de inicia o e propaga o bem como as condi es reacionais dessas polimeriza es. Os resultados das polimeriza es mostraram que a nucleofilicidade do iniciador e os diferentes grupos alquilas presentes nos sulfatos de dialquila afetam a rea o de inicia o e influenciam a propaga o das espécies ativas devido ao efeito do contra-íon derivado desses iniciadores. Os sulfatos de dialquila investigados exibiram uma boa eficiência na inicia o e seus comportamentos foram próximos.
Híbridos na paisagem: uma etnografia de espa?os de produ??o e de conserva??o
Silveira, Pedro Castelo Branco;
Ambiente & Sociedade , 2009, DOI: 10.1590/S1414-753X2009000100007
Abstract: the present article deals with hybrids emerging in the landscapes built by the inhabitants of the rural zone of s?o luiz do paraitinga and a team of researchers studying the region, which i was part of. the appearance of these hybrids, considered to have taken place in a context of crisis, said so by several agents, and in landscapes where there is presumably a division of production and preservation sites, indicates a broad crisis of modernity, in the sense of latour that "we have never been modern".
Fic o, literatura e história através da “Cr nica do descobrimento do Brasil (1840), de Francisco Adolfo de Varnhagen
Pedro Telles da Silveira
História da Historiografia , 2009,
Abstract: Inspirando-se no debate da crítica literária alem e no trabalho de Luiz Costa Lima, este artigo procura questionar os aspectos ficcionais do relacionamento entre as ent o recémnascidas disciplinas da literatura e da história através da análise da “Cr nica do descobrimento do Brasil”, de autoria de Francisco Adolfo de Varnhagen e primeiramente publicada nas páginas do periódico português O Panorama. O texto, uma documentada recria o literária do descobrimento do Brasil, cria, paradoxalmente, através do documento mesmo seus aspectos ficcionais. Dessa forma, inverte o relacionamento ent o estabelecido entre o histórico e o literário no Romantismo português ou nas práticas das primeiras express es literárias brasileiras. A partir dessa invers o se procura os signos do ficcional.
Parks in peril: people, politics and protected areas
Silveira Pedro Castelo Branco
Ambiente & Sociedade , 2001,
Ladle Slag of Electric Steelmaking as Alkaline Agent on Controlling of Acid Mine Drainage Generation  [PDF]
Luciana Angelita Machado, Luisa Ventura de Freitas, Pedro Ivo Chitolina Villetti, Rejane Maria Candiota Tubino, Ivo André Homrich Schneider
Journal of Environmental Protection (JEP) , 2013, DOI: 10.4236/jep.2013.412A2001

Commercial coal production in the southern region of Brazil (comprising the Paraná, Santa Catarina, and Rio Grande do Sul states) has been occurring since the beginning of the twentieth century. Regarding the Santa Catarina coalfields, about 60% - 65% of the ROM coal is discharged at dump deposits as waste. These wastes can lead to the formation of acid mine drainage (AMD), a source of ground and surface water pollution. One of the technologies used for preventing AMD consists of the alkaline additive method. Thus, the aim of this work was to study, at laboratory scale, the DAM control by blending coal waste with a metallurgical slag. A coal-tailing sample was collected from a coal mine, and the slag was obtained from a semi-integrated steel plant. Static tests were carried out by the acid-base account method to determine the balance between the acid-producing and acid-consuming (neutralizing) mineral components of the samples. Kinetic tests were conducted in humidity cells, following the ASTM D 5744-96 method, for a period of 80 weeks. The results showed that the coal tailing generates AMD. However, environmental problems can be minimized by mixing the coal waste with the metallurgical slag in 1:1 or 1:1.5 proportions. The kinetic experiments proved that, in this condition, the lixiviation presents a higher pH and a lower concentration of acidity, metals, and sulfate. Finally, it is possible to conclude that the blending slag in coal tailing deposits can be a viable alternative for DAM control in coal mining.

Biologia reprodutiva de Pseudolaelia corcovadensis (Orchidaceae): melitofilia e autocompatibilidade em uma Laeliinae basal
Borba, Eduardo L.;Braga, Pedro Ivo S.;
Brazilian Journal of Botany , 2003, DOI: 10.1590/S0100-84042003000400013
Abstract: the floral biology, mating systems and phenology of pseudolaelia corcovadensis (orchidaceae), in the "esta??o de pesquisa e desenvolvimento ambiental de peti", s?o gon?alo do rio abaixo, minas gerais state was studied. this species flowers from april to september, with a higher availability of flowers in june and july. the flowers are dark-pink, strongly zygomorphic, and have osmophores and nectar-guides absorbing ultraviolet light. however, the flowers of p. corcovadensis do not present nectar and are pollinated by bombus (fervidobombus) atratus franklin, 1913 (hymenoptera: apidae) by deceit. apparently, the flowers do not form a model-mimic pair with other species in the community, but mimic a generalized melittophilous food-flower. as a consequence, visits are very rare and fruit set is low (18%). pseudolaelia corcovadensis is self-compatible and presents inbreeding depression in the early stages of development. the phylogenetic position of the genus pseudolaelia and studies on floral biology in related genera suggest that melittophyly and self-compatibility are basal characters in the subtribe laeliinae, with subsequent adaptive radiation to pollination by hummingbirds, lepidoptera, diptera and other hymenoptera.
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