Efeitos do pinning nos regimes dinâmicos de vórtices em supercondutores do tipo II

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Inomogeneidades estruturais em amostras nanoscópicas de supercondutores de alta temperatura crítica

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

União Européia: a luta pelo reconhecimento identitário e a questão da cidadania supranacional

Pós-graduação em Ciências Sociais - FFC

Preparação e caracterização de filmes finos supercondutores para aplicação em dispositivos eletrônicos

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Obtenção de filmes finos supercondutores do sistema BSCCO dopados com prata

Pós-graduação em Ciência dos Materiais - FEIS

Arte-experimento: o bailado narrativo de Cara-de-Bronze

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estudo da adição de dopantes a base de carbono nas propriedades anelásticas de MgB2

Pós-graduação em Ciência e Tecnologia de Materiais - FC

Estudo das propriedades de pastilhas e fios supercondutores do sistema BSCCO dopados com compostos nanoparticulados de cálcio

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Leitura crítica da produção literária de Alfonsina Storni

This paper presents the trajectory traced by the Literary Criticism on the poetry of Alfonsina Storni, an Argentine writer of the early twentieth century. The first literary production of Alfonsina Storni, called modernist or tardorromántica (SARLO, 1988), is produced in the period 1916-1925; from Ocre (1926), she marks a break, confirmed in their last two books of poetry, Mundo de siete Pozos (1935) and Mascarilla y Trébol (1938), with the label of vanguardism and new aesthetic experiences such as antisoneto. Regarding the Criticism built over the poetic work of Alfonsina Storni by his contemporaries, we have three positions of reading: approaches biographical criticism and proposals for readings of critics and poets linked to Vanguard Argentina and made some critical texts by women from the middle academic. According to Salomone (2006), the criticism made by third trend marks another landmark of the constitutive deed of Alfonsina Storni, show tensions and positions that differ from the hegemonic critical. Subsequently, there is setting up a Women's Literature, along with a normative critique, which will consider the production book produced by women as produced by a subject biological woman, and that represents certain textuality with naturalized features peculiar to women. Today, in light of the Critical Feminist and contributions of Discourse Analysis, especially on the concepts and the connections between language and power, a critical reading of the production female, consists of texts of women writers since the mid-nineteenth century, is focused as a result of an ideological perspective and typically androcentric patriarchal, for example, on poems by Alfonsina Storni. According to Alice Salomone (2006), from the 80s of last century, the look on the production literary Latin American writers has another approach, which she calls "critical current: feminist criticism and modernity cultural".

Tratamento térmico de filmes supercondutores do sistema BSCCO utilizando forno de micro-ondas doméstico

Pós-graduação em Ciência dos Materiais - FEIS

Profile and crowding of currents in mesoscopic superconductors with an array of antidots

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

Characterization of superconducting BSCCO/CaSiO3 and BSCCO/CaZrO3 Ag PIT wires

The addition of two compounds, calcium silicate and calcium zirconate was tested in the preparation of Bi: 2212 silver sheathed wires by powder-in-tube method. The wires were treated in an atmosphere of O-2/Ar using partial melting method. The characterizations were structural and on their electrical and magnetic properties. It was found that the addition of calcium silicate or zirconate promoted higher transition temperatures, up to 116 K for BSCCO with 1wt.% CaSiO3. The critical current densities determined by transport and magnetization measurements were improved in comparison with the wires without any addition.

The changes on microstructure and electrical properties of Bi:2223/Ag composite as a function of the granulation and the content of the added silver powder

The Bi-Sr-Ca-Cu-O system has been one of the most studied superconducting ceramic materials for industry applications. The most of the studies with this aim are on silver/ceramic composites, due to the benefits and great compatibility of this metal with the oxide. In this paper we describe a systematic and comparative study on Ag/BSCCO composite, made by the citrate route, in which the ceramic pellets are sintered in the presence of silver powder using several proportions and having several granulations. It was observed that the introduction of fine (0.5 and 2 μm) silver powder in the proportions of 5 wt. % always implies in a better critical current density compared to the no silver pellet. According to the results, the silver powder in excess of 5 wt.% may not promote best electrical properties, depending on the size of the silver particles.

Oxygen Interstitial Dynamics in Bi(2)Sr(2)CaCu(2)O(8+delta) Oxides Measured by Mechanical Spectroscopy

Many researchers became interested in the discovery of Bi(2)Sr(2)CaCu(2)O(8+delta) oxides with critical temperature of around 80 K. It is known that the critical temperature is related to the CuO2 planes of the material. For this reason, the study of the interstitial oxygen in these oxides is of great relevance. The samples were prepared by means of conventional solid state reactions, through the stoichiometric mixture of precursory powders. After the sinterization, the samples were submitted to measurements of density, electrical resistivity, x-ray diffraction, scanning electron microscopy and energy dispersion spectroscopy, with the objective of performing their characterization. The measurements of mechanical spectroscopy were performed by a torsion pendulum. The results show three relaxation processes in the temperature range of 200 and 700 K, with activation energy of approximately 0.9 eV, which has been attributed to the dynamics of the interstitial oxygen present in the material.

Characterization of superconducting BSCCO/CaSiO3 and BSCCO/CaZrO3 Ag PIT wires

The addition of two compounds, calcium silicate and calcium zirconate was tested, in the preparation of Bi: 2212 silver sheathed wires by powder-in-tube method, which were successfully tested previously in processing chips. The wires were treated in an atmosphere of O2/Ar using partial melting method. The characterizations were structural and on their electrical and magnetic properties. As the results, transition temperatures were higher than the expected for this stage, ranged from 105K (BSCCO880) to 116K (+Si883). The critical current densities encountered in transport and magnetization measurements were improved in comparison with the wires without addition.