884 resultados para Fluxos de Calor Sensível e Latente


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The present work aims to study the characteristics of the alloy Al - 7 % Si - 0 , 3Mg ( AA356 ) , more specifically characterize the macrostructure and microstructure and mechanical properties of the alloy ingots AA356 obtained in metal molds and sand molds for power studying the structures through the difference of cooling rates . This alloy is explained by the fact of referring league has excellent combination of properties such as low solidification shrinkage and good fluidity, good weldability , high wear resistance , high strength to weight ratio, has wide application in general engineering , and particularly in the automotive and aerospace engineering . In this work we will verify this difference in properties through two different cooling rates . We monitor the solid solidification temperatures by thermocouples building with them the cooling curve as a tool that will aid us to evaluate the effectiveness of the grain refining because it achieved with some important properties of the alloy as the latent heat of solidification fraction the liquid and solid temperatures, the total solidification time, and identify the presence of inoculants for grain refinement. Thermal analysis will be supported by the study of graphic software “Origin “will be achieved where the cooling curve and its first derivative that is the cooling rate. Made thermal analysis, analysis will be made in macrographs ingots obtained for observation of macrostructures obtained in both types of ingots and also analysis of micrographs where sampling will occur in strategic positions ingots to correlate with the microstructure. Finally will be collecting data from Brinell hardness of ingots and so then correlating the properties of their respective ingots with cooling rate. We found that obtained with cast metal ingots showed superior properties to the ingots obtained with sand mold

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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This work aims to evaluate the different trajectories in terms of production structure, technological capabilities and performance in international trade of pharmaceutical industries in Brazil and India. For this, we build international trade indicators, based on data provided by the COMTRADE, the UN database for trade. Through the indicators, it is observed that the countries have different results in the catch-up process of the pharmaceutical industry. India has built a productive structure strongly based on generic drugs, with which it is able to greatly meet domestic demand and export to many countries worldwide. Brazil remains in a position of dependence of foreign production, with a high level of imports and exports to the region of Latin America

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In this paper, we circumscribe a domain of theoretical research on the combination dynamics between the dimensions of presence and absence, visibility and invisibility, which emerges in the phenomenology of perception as an essential trait which marks both our experience of the perceived world and our subjective and intersubjective experience. We prioritize a theoretical axis that integrates Edmund Husserl and Maurice Merleau-Ponty’s thinking into Renaud Barbaras’ recent contributions. To this philosophical framework, we link contributions especially of psychology, outlining the circular movement observed between the phenomenology of perception and phenomenological psychology, Gestalt psychology, psychoanalysis, cognitive sciences and neurosciences.

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The present study represents a qualitative thesis, characterized as a case study, which uses the method of the present approach. In addressing the academic home in physical education, there is the constancy of the discussions regarding the curriculum and professional formatting. In view of the curriculum modifications to fit the new legislation, and the fact they are few studies related to private institutions that offer such courses, which offer even greater number of courses when compared to public institutions aimed to investigate and analyze the professional profiles, curricular goals and flows contained in the pedagogical projects of courses bachelor degree in physical education and a private institution of higher education of the State of São Paulo, as well as verifying the existence and adequacy of articulation to the institutional educational project and the institutional development plan. Compounding the literature review discussed the key historical facts relating to courses in physical education in our country, and its path to the current model. Also presented was the law of physical education courses in force in Brazil and some concepts about teaching course projects and their relationship to other institutional documents. Techniques were used to review and document analysis, with primary source documents of their own and other government institution. It found a lack of interest of some private institutions of higher education in official documents available for this type of research, which is bad since there are more courses offered by them compared to public institutions. As for the degree course for training teachers of physical education, found lack of specificity regarding the differentiation between content and the bachelor, which ends up deviating from the expectations contained in the course to the one presented in the curriculum. Thus, it becomes a need for greater collaboration of private institutions of higher education...

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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We report here a study about the application of a formal teaching strategy about heat and temperature concepts applied among high school students. The strategy belongs to a research trend which deals with epistemological analogies and has an innovative character related to the students’ preparation for rational debates between conceptions and/or rival theories, using didactical rational reconstruction (DRR) which aims to help scientific concepts rational learning. We investigate the outcomes of this preparation and students’ conceptual development, analyzed through a qualitative-interpretative methodological approach.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)