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A representação de línguas no ciberespaço: um funcionamento enunciativo na contemporaneidade
(Universidade Federal de São Carlos, 2014-10-24) Stahlhauer, André Stefferson Martins; Silva, Soeli Maria Schreiber da; https://lattes.cnpq.br/8794598988783452; https://lattes.cnpq.br/1042124312764795
D'après les discussions de concepts de la sémantique de l énonciation, nous faisons une lecture des sitewebs officiels des pays dans lesquels nous trouvons des sections qui représent des langues qui circulent dans ces lieux. Ainsi, nous analysons les désgnations « l anglais", « le français », « l allemand », « l'italienne » et « le reto-romanche » dans le siteweb de la Suisse, « Langue française», dans ce de la France, et la désignation « portugais », dans ce du Brésil, afin de comprendre comment leurs significations sont construits par les disparités entre le national, le réel et les règlements de l'officiel et du virtuel. Dans ce lieu de représentation, nous montrons les agencements operations énuntiatives operés par l haute-parleurEtat, c est à dire, sa façons, d integrer ses énonces à la textualité de siteswebs organisées par un autre agencement spécifique d'un texte d'Internet, où s inscrit l hautparleursWeb, en même temps que l'État. En conséquence, nous réfléchissons sur les espaces de représentation de l'énonciation sur les siteswebs officiels pour mieux comprendre comment dans ce mouvements d écritures des pays sur l internet dessinent des sens des désignations des langues parlées dans ces espaces. Dans l évenement de l énonciation, selon Guimarães (2002), on temporalise les sens de ces langues. Ainsi, la temporalité, la politique et le politique, les espaces de l'énonciation et la textualité des siteswebs sont à la base de la discussion de la constitution du sens des ces langues. De plus, par rapport à la politique et le politique, on entreprend ce travail, un effort pour penser ses mouvements, puisque dans les systèmes démocratiques, les politques basées sur le consenssus régissant les pratiques d'inclusion et d'exclusion des parlants des processus des signfications. Alors, dans ce mouvement de descriptions/interprétation, on montre les hiérarchies qui signifient dans le travail énontiative entre les langues et les parlants, qui sont-elles caracteristiques de ces espaces d énonciation, bien que ses procédures qui manipulent ces parlants hautparleursÉtatWeb pour l'organisation du texte, comme les re-écrituration, l articulation et l énumération.
Estudo do efeito do envelhecimento eletroquímico em filmes de poli(3-hexiltiofeno)
(Universidade Federal de São Carlos, 2014-10-24) Gonçalves, Roger; Souza, Ernesto Chaves Pereira de; https://lattes.cnpq.br/1505400360366643; https://lattes.cnpq.br/5949704693295518
The study of the electrochemical aging of conductive polymers, including of polythiophenes, has been described in the literature. However, this paper proposed study, in addition to electrochemical aging of polyethylene films (3-hexylthiophene), the influence of synthesis variables on the initial electrochemical properties of the films and also how they affect the degradation process. This study was conducted using factorial designs 23, in which the variables were the concentration of monomer (3- hexylthiophene), electrolyte concentration (LiClO4) and the presence of water, on two levels. To estimate the effect were used for responses the parameters of cyclic voltammetry, the impedance spectra and the Mott-Schottky curves. The model of transmission lines for porous electrodes where used for fit the impedance spectra. It has been shown that the changes observed are related to modifications in film/solution interface, because the parameters of impedance spectra have undergone major changes. It was also possible to assess the variables affect the synthesis not only the initial parameters as well as the extent of degradation that the polymer undergoes, including, identifying two stages of degradation. The first stage occurs before 120 min, and that in most of the films has a rate of change of the parameters marked. The second time, with slightly larger gear change occurs after this time. There is a relationship between the initial parameters and the evolution of degradation. In general, the films with improved initial properties have lower resilience to the degradation process, while the films with lower values of initial properties have shown less variation in these parameters over the same process.
Rebitagem por fricçao de alumínio 2024-T351 em policarbonato
(Universidade Federal de São Carlos, 2014-10-24) Rodrigues, Camila Fernanda; Canto, Leonardo Bresciani; https://lattes.cnpq.br/7287108960864123; https://lattes.cnpq.br/2648446209218729
This dissertation addressed the feasibility study of Friction Riveting technique on polycarbonate and 2024-T351 aluminum alloy spot joints. Design of experiments and Artificial Neural Network modelling were used to investigate the influence of process parameters on mechanical and microstructural properties of joints. These joints were produced at the Institute for Research Helmholtz Zentrum Geesthacht (HZG), in Germany, during the undergraduate years of the applicant. Process temperature was measured using an infrared camera. The mechanical properties of the joints were determined by tensile testing. The macro and microstructural characterization were carried out by light optical microscopy (LOM) and Vickers microhardness tests. The fracture mechanisms were investigated by optical and scanning electron microscopy (SEM). The level of PC degradation in the joining area was obtained by viscometry and Fourier transform infrared spectroscopy (FTIR). The average peak temperatures meausured during joining varied between 52% and 72% of the melting point interval of AA 2024 aluminium alloy. Strong joints with high anchoring efficiency were achieved, with ultimate tensile strength of approximately 90% of metallic rivet, and non-catastrophic ductile fracture at the metallic rivet outside the joined area. This is desirable failure type in riveted polymeric structures and an indication of high-strenght joints. The viscometry and FTIR analysis showed the absence of thermal degradation of the PC in the riveted joint. Statistical and Artificial Neural Networks modeling process showed good repeatability and reproducibility within the conditions studied. These results demonstrated the feasibility of producing spot joints of rivets 2024-T351 and PC by using the FricRiveting process.