Navegando por Data de Publicação, começando com "2018-11-21"

Filtrar resultados por ano ou mês

Agora exibindo 1 - 3 de 3

Uma análise sobre os estilos de participação entre meninas e meninos nas aulas de educação física
(Universidade Federal de São Carlos, 2018-11-21) Bergamim, Gabriel Barbosa de Souza; Souza Júnior, Osmar Moreira de; https://lattes.cnpq.br/9176123942671062; https://lattes.cnpq.br/8059679311395550
Scholar Physical education is an environment in wich the students’ participation use to occur in a hierarchical way, different styles of participation can be observed and some power and protagonism relationships are established, especially in team sports. Among the factors that influence those relationships in classes are the student’s motor ability level, their biotype, the amount of class colleagues wherewith their establish relationships and the student’s sex. The scientific literature already points that the last aspect is an important marker. Two researches were used as base to data collection and analysis in current research, one recent and other with more than 30 years (JACO, 2012; GRIFFIN, 1984; GRIFFIN, 1985). Both researches found categories that describe different manners of participating in classes. The current study was characterized as ethnographic, making use of participating observation and the half strutuctured interview; and had as general objective to check wich participation styles can be identified in 6th grade Physical Education classes. The results appoint that there are different participation styles in Physical Education classes, especially the styles: Macho, Lost Soul, Nice Guy, Invisible Player, Protagonist, Figurant, Flutuant and excluded, proposed by Griffin (1984; 1985) and Jaco (2012), likewise the styles Egoist and Distracted, incorporated by the current research; and that the teacher must be alert to any situation that can negative influence on student’s motivation an interest in classes. It was concluded that the teacher should be aware that their students have different manners of understanding and appropriating the classes, being disposed to intervene on constringing situations that can exercise negative influence on students’ motivation, provoking their reflections about how they can act thinking on constructing a space in wich everyone can feel equally included and motivated to participate.
Estudo dos efeitos da substituição de Feldspato por Filito em massas de porcelanato
(Universidade Federal de São Carlos, 2018-11-21) Sanchez, Miguel Yesid Hernandez; Dondi, Michele; https://lattes.cnpq.br/4617859135105539; Boschi, Anselmo Ortega; https://lattes.cnpq.br/3259846931278607; https://lattes.cnpq.br/0632424053619904
Porcelain stoneware tiles, porcelanatos, present excellent technical and aesthetic characteristics. In Europe, the bodies used in the manufacture of porcelain and porcelanatos are based on the classic triaxial ceramic, clay, quartz and feldspar, and the latter plays the role of flux. Bodies of this type have been thoroughly studied. In Brazil, for various reasons, virtually all the industries that produce glazed porcelain stoneware tiles replaced feldspar by the phyllites. Although this practice, the replacement of feldspar by phyllites, has already occurred for some decades, the implications of this substitution have not been properly studied. The general objective of this work was to identify and seek explanations for the differences in behavior during firing caused by the substitution of feldspar by phyllite in the bodies used in the manufacture of glazed porcelain stoneware tiles. For this, the raw materials alone, feldspar and phyllites, as well as bodies containing the same content of these raw materials, were evaluated comparatively. Based on the results produced by several characterization techniques, among them the gresification curves and the chemical composition of the vitreous phases after the firing, the following conclusions were reached: 1) the behavior of the raw materials, feldspar and phyllites during firing are quite different; 2) different phyllites exhibit significantly different behavior during firing; 3) the differences in behavior between the phyllites is mainly due to the variation of the sericite content (muscovite fine-grained mica); 4) the behavior of pure raw materials is transferred to the masses which contain them.; 5) although the minerals responsible for forming the liquid phase during firing are significantly different, a mixture of feldspar, albite and orthoclase, and sericite, the chemical compositions of the vitreous phases formed are similar; 6) the volume of liquid phase during sintering seems to be one of the main variable responsible for the observed differences in the behaviour during firing.
Evolução microestrutural e propriedades mecânicas decorrentes da solidificação das ligas Al-11%Si-xCu
(Universidade Federal de São Carlos, 2018-11-21) Donadoni, Bruno Monti Carmelo; Spinelli, José Eduardo; https://lattes.cnpq.br/8882038118634925; https://lattes.cnpq.br/7500412122758761
Al-Si-Cu ternary alloys are highly used and recommended to produce joints of aluminum alloys using brazing process. Dissimilar joints between these alloys and stainless steels, carbon steels and low alloy steels can also be fabricated. More specifically, the Al-Si-Cu alloys comprehend the BAlSi-3 brazing class. However, the relationships between the solidification thermal parameters, microstructural parameters and mechanical properties remains undetermined in the literature. In this manuscript the experimental relationships between the mechanical properties and the thermal and microstructural parameters of Al-11%Si-3,0%Cu and Al-11%Si-4,5%Cu ternary alloys will be outlined. Both casting alloys were solidified under transitory heat flow conditions which could be achieved thanks to the unidirectional solidification system. Samples were subjected to a representative range of microstructures due to the broad cooling rate range. Thermodynamics simulations were performed using the Thermo-Calc® software and other analysis have been made to complement the characterization such as X-Ray Diffraction and Scanning Electron Microscopy. At the end, a better comprehension of the formed phases and their chemical composition has been attained. The present work proposes to develop experimental growth relationships for primary, secondary and tertiary dendrite arm spacing, 𝜆1, 𝜆2 and 𝜆3 and eutectic spacing, 𝜆𝑒 impacting the mechanical properties. The experimental results demonstrated that 50% increase in the Cu alloying (from 3.0 to 4.5 wt.%) could be operated to obtain significant variations in the dendritic length-scale of the microstructure across the produced parts. Overall the microstructures is constituted by an α -Al dendritic matrix surrounded by a ternary eutectic consisting of α-Al + Al2Cu + Si. The scale measurements committed to the Al2Cu eutectic phase pointed out that the increase in Cu alloying has a critical role on refining the ternary eutectic.