108 resultados para SI NANOCRYSTALS


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Pós-graduação em Educação Matemática - IGCE

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Que relações podem ser estabelecidas entre o vivido e o lembrado? Que desafios as práticas da escrita de si trazem para a formação? Proponho uma interlocução com trabalhos que venho orientando em que autor/as produzem reflexões que remetem a um modo de relacionarem-se consigo mesmos, enquanto sujeitos do conhecimento do objeto pesquisado, e revelam-se em uma escrita pautada nas mudanças de pensamento. Aporto-me na valorização da narrativa como forma artesanal de comunicação, vinculada à substância viva da existência, que é a experiência; na experiência da escrita literária, razão de ser da própria existência; na experiência como o que nos acontece. Referir-se à experiência vivida é relatar a caminhada da pesquisa, a construção do objeto, caminhos teórico-metodológicos, as considerações. Referir-se ao lembrado é transitar (dançar?) pelo que escapa às formalizações, cada relato é único, próprio, coisa que penetra, contamina, deixa marcas e provoca abertura para quem lê; são relatos do lembrado que vem pela memória e materializa-se em fragmentos materiais deixados por quem pratica uma escrita de si. A relação entre a experiência vivida e o lembrado abre pistas para pensar a formação.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Pós-graduação em História - FCHS

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A theoretical approach aiming at the prediction of segregation of dopant atoms on nanocrystalline systems is discussed here. It considers the free energy minimization argument in order to provide the most likely dopant distribution as a function of the total doping level. For this, it requires as input (i) a fixed polyhedral geometry with defined facets, and (ii) a set of functions that describe the surface energy as a function of dopant content for different crystallographic planes. Two Sb-doped SnO2 nanocrystalline systems with different morphology and dopant content were selected as a case study, and the calculation of the dopant distributions expected for them is presented in detail. The obtained results were compared to previously reported characterization of this system by a combination of HRTEM and surface energy calculations, and both methods are shown to be equivalent. Considering its application pre-requisites, the present theoretical approach can provide a first estimation of doping atom distribution for a wide range of nanocrystalline systems. We expect that its use will support the reduction of experimental effort for the characterization of doped nanocrystals, and also provide a solution to the characterization of systems where even state-of-art analytical techniques are limited.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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This paper deals with the problem of experience and its possible languages between school knowledge and practices. Its objective is to find the different possibilities of thinking the experience in the educational praxis, based on the contemporary philosophical categories of event and childhood as well as on the genres of poetic language and testimony. In order to do so, it is reconstructed a genealogy of the transformation of educational praxis into pedagogical art in its relationships with childhood whether as a government goal or as a subject, revealing the domination states that constitute them and pointing out their potential of resistance to the actual one. It is also stated that this event breaks into in the aesthetic dimension of experience and concurs in order to interrupt the order of discourse, making subjects of educational praxis think about it and causing care of oneself to become an ethic attitude put together with an aesthetics of experience. Thus, this research aims at restoring the dignity of experience among school knowledge and practices.

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This essay discusses the theme of poetics in teaching activity, and discusses its possible ability to think about the ethical-formative sense and its possible political use to propose alternatives to the educational praxis that is restricted, in actuality, a pragmatic teaching. From the point of view of aesthetics of existence, therefore, we proposes a particular notion of poetic, fairly close to what can be understood by the dramatic that underlies the pragmatic of you last Foucault, as well as analyzes your chances to problematize the current pragmatic teaching. Thus, we look forward to assist the educator thinking both the possibility of ethics (self) transformation as the meaning of formation of another in his educational activity.