Spectral redistribution of waveguided emission in BEH-PPV films

We report on spectral redistribution of the photoluminescence (PL) emission from the edge of thin-film planar waveguides of the conjugated polymer BEH-PPV [Poly(2,5-bis(2'-ethyl-hexyl)-1,4-phenylenevinylene] induced by self-absorption in the polymer film. The PL spectra present drastic changes and displace to longer wavelengths with increasing self-absorption. We observe an enhancement of the absolute PL intensity at longer wavelengths, which was interpreted as due to re-emission of self-absorbed photons. The significant efficiency for the PL re-emission suggests the use of self-absorption as a mechanism for tuning the emission into the near infrared.

Solitons in Bose-Einstein condensates trapped in a double-well potential

We investigate, analytically and numerically, families of bright solitons in a system of two linearly coupled nonlinear Schrodinger/Gross-Pitaevskii equations, describing two Bose-Einstein condensates trapped in an asymmetric double-well potential, in particular, when the scattering lengths in the condensates have arbitrary magnitudes and opposite signs. The solitons are found to exist everywhere where they are permitted by the dispersion law. Using the Vakhitov-Kolokolov criterion and numerical methods, we show that, except for small regions in the parameter space, the solitons are stable to small perturbations. Some of them feature self-trapping of almost all the atoms in the condensate with no atomic interaction or weak repulsion is coupled to the self-attractive condensate. An unusual bifurcation is found, when the soliton bifurcates from the zero solution with vanishing amplitude and width simultaneously diverging but at a finite number of atoms in the soliton. By means of numerical simulations, it is found that, depending on values of the parameters and the initial perturbation, unstable solitons either give rise to breathers or completely break down into incoherent waves (radiation). A version of the model with the self-attraction in both components, which applies to the description of dual-core fibers in nonlinear optics, is considered too, and new results are obtained for this much studied system. (C) 2003 Elsevier B.V. All rights reserved.

SELF-CONSISTENT SOLUTION OF THE SCHWINGER-DYSON EQUATIONS FOR THE NUCLEON AND MESON PROPAGATORS

The Schwinger-Dyson equations for the nucleon and meson propagators are solved self-consistently in an approximation that goes beyond the Hartree-Fock approximation. The traditional approach consists in solving the nucleon Schwinger-Dyson equation with bare meson propagators and bare meson-nucleon vertices; the corrections to the meson propagators are calculated using the bare nucleon propagator and bare nucleon-meson vertices. It is known that such an approximation scheme produces the appearance of ghost poles in the propagators. In this paper the coupled system of Schwinger-Dyson equations for the nucleon and the meson propagators are solved self-consistently including vertex corrections. The interplay of self-consistency and vertex corrections on the ghosts problem is investigated. It is found that the self-consistency does not affect significantly the spectral properties of the propagators. In particular, it does not affect the appearance of the ghost poles in the propagators.

Generation of copper nanoparticles induced by fs-laser irradiation in borosilicate glass

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

Room temperature visible/infrared emission and energy transfer in Nd3+-based organic/inorganic hybrids

The photoluminescence features and the energy transfer processes of Nd3+-based siloxanepoly(oxyethylene) hybrids are reported. The host matrix of these materials, classed as di-ureasils, is formed by a siloxane backbone covalently bonded to polyether chains of two molecular weights by means of urea cross-links. The room-temperature photoluminescence spectra of these xerogels show a wide broad purple-blue-green band (350-570 nm), associated with the emitting centres of the di-ureasil host, and the typical near infrared emission of Nd3+ (700-1400 nm), assigned to the 4F3/2 → 4I9/2,11/2,13/2 transitions. Self-absorptions in the visible range, resonant with intra-4f3 transitions, indicate the existence of an energy conversion mechanism of visible di-ureasil emission into near infrared Nd3+ luminescence. The existence of energy transfer between the di-ureasil's emitting centres and the Nd3+ ions is demonstrated calculating the lifetimes of these emitting centres. The efficiency of that energy transfer changes both with the polymer molecular weight and the Nd3+ concentration.

Spontaneous resolution rates of vesicoureteral reflux in Brazilian children: A 30-year experience

Objective: We evaluated clinical characteristics of primary vesicoureteral reflux (VLJR) in infants in a 30-year period in Brazil with special reference to the relation of renal parenchymal damage to urinary tract infection and gender. Materials and Methods: From 1975 through 2005, 417 girls (81.6%) and 94 boys (18.4%) with all grades of reflux were retrospectively reviewed. Patients were categorized by the worst grade of reflux, maintained on antibiotic prophylaxis and underwent yearly voiding cystourethrography until the reflux was resolved. VUR was considered resolved when a follow-up cystogram demonstrated no reflux. Surgical correction was recommended for those who fail medical therapy, severe renal scarring or persistent VUR. Results: Grades I to V VUR resolved in 87.5%, 77.6%, 52.8%, 12.2% and 4.3%, respectively. Renal scars were present at presentation in 98 patients (19.2%). Neither gender nor bilaterality versus unilaterality was a helpful predictor of resolution. The significant difference was found among the curves using the log rank (p < 0.001) or Wilcoxon (p < 0.001) test. Conclusion: Despite the current use of screening prenatal ultrasound, many infants are still diagnosed as having vesicoureteral reflux only after the occurrence of urinary tract infection in our country. Scarring may be associated to any reflux grade and it may be initially diagnosed at any age but half of the scars are noted with higher grades of reflux (IV and V). The incidence of reflux related morbidity in children has significantly diminished over the last three decades.

Energy efficiency potential in Jamaica: challenges, opportunities and strategies for implementation

Incluye Bibliografía

Self-optimization of dense wireless sensor networks based on simulated annealing

Wireless sensor network (WSN) Is a technology that can be used to monitor and actuate on environments in a non-intrusive way. The main difference from WSN and traditional sensor networks is the low dependability of WSN nodes. In this way, WSN solutions are based on a huge number of cheap tiny nodes that can present faults in hardware, software and wireless communication. The deployment of hundreds of nodes can overcome the low dependability of individual nodes, however this strategy introduces a lot of challenges regarding network management, real-time requirements and self-optimization. In this paper we present a simulated annealing approach that self-optimize large scale WSN. Simulation results indicate that our approach can achieve self-optimization characteristics in a dynamic WSN. © 2012 IEEE.

O ator criador na Fondazione Pontedera Teatro: reflexões acerca do diretor ignorante e do ator emancipado

Pós-graduação em Artes - IA

Infografia impressa: a aplicação de tecnologias digitais na construção de estampas artísticas

Pós-graduação em Artes - IA

Paisagem híbrida: a reprodutibilidade da imagem na arte contemporânea

Pós-graduação em Artes - IA

Discurso, gênero e argumentação na auto-ajuda de Shinyashiki

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Cartografemas: fragmentos autobiográficos de um artista-professor

Esta pesquisa, de cunho narrativo autobiográfico, aborda a trajetória de vida do artista plástico e professor Jorge Eiró. A pesquisa propõe-se a investigar as articulações entre as atividades desempenhadas e suas implicações em seu processo de formação. Incorpora como referência plástica e conceitual a poética visual de sua obra associada às suas afinidades estéticas e culturais enquanto produção de subjetividade. Neste movimento, a composição da escritura narrativa configura-se em uma cartografia e assume o sentido de função, segundo o conceito de Gilles Deleuze e Félix Guattari, alinhando-se numa perspectiva teórica pós-estruturalista. Nessa concepção, sujeito e objeto da cartografia autobiográfica convertem-se em superjecto. A narrativa transcorre em relatos fragmentados, dispersos mas articulados entre si, elaborados na forma de biografema, segundo o conceito de Roland Barthes. A função da cartografia articulada com a forma do biografema constituem o amálgama narrativo de cartografemas. A escritura é atravessada por referências culturais, musicais (trilha sonora) e literárias (lira literária) da memória afetiva do autor. A problematização consiste no modo como se articulam e se refratam os componentes autobiográficos, enunciados nos biografemas. De metodologia bibliográfica, esta pesquisa apresenta como categorias fundamentais a autobiografia em educação, a arte e a docência em arte. Na composição deste autorretrato, o quadro teórico-metodológico da cartografia é traçado por linhas cardeais de referência dos seguintes autores: Nietzsche, Deleuze e Guattari conceituam a cartografia numa perspectiva pós estruturalista; Barthes concebe a escritura narrativa na forma de biografemas; Larrosa e Rolnik alinham as coordenadas cartográficas para uma autobiografia em educação; Argan e Derdyk desenham o campo da história e filosofia da arte; finalmente, Corazza e Silva colorem a composição com a filosofia da diferença em educação e a poética de uma escrita-artista.

(In)visíveis sequelas: a violência psicológica contra a mulher sob o enfoque gestáltico

A modalidade violência psicológica é mais conhecida pela sua “invisibilidade” no âmbito público em razão de, entre outros fatores, ocorrer mais frequentemente na esfera privada, bem como por não deixar marcas físicas. Atualmente, a Lei 11.340/2006, batizada de “Lei Maria da Penha”, depois de sancionada, traduz uma forma de amparo legal e institucionalizado para as mulheres. Empregamos a concepção de gênero segundo Scott (1991), como uma das ferramentas analíticas que permitem identificar nexos entre a construção socioeconômica da violência e as políticas do Estado. Neste panorama, apresentamos como objetivo geral desta pesquisa empírica desvelar algumas (in) visíveis sequelas psíquicas e sociais e de modo específico as repercussões na subjetividade da mulher que vivencia situações de violência psicológica ocorridas em âmbito doméstico e intrafamiliar. As análises foram realizadas na perspectiva Gestáltica, uma abordagem psicológica do contato consciente, cuja intervenção permite o fortalecimento do suporte interno e auto-regulação saudável, de modo a superar situações que obscurecem as funções e fronteiras de contato. Trata-se de uma pesquisa clínico-qualitativa de base fenomenológico-existencial-gestáltica e hermenêutica. Os procedimentos utilizados foram: submissão do projeto ao Comitê de Ética do CCS/UFPA; obtenção da autorização Institucional; identificação e convite a três mulheres para participarem da pesquisa, segundo o perfil de inclusão na amostra: disponibilidade para a pesquisa, faixa etária de 25 a 45 anos, que esteve ou está vivenciando situação de violência psicológica com seu marido/companheiro. Posteriormente, foi assinado o Termo de Consentimento Livre e Esclarecido e realizado as entrevistas semi-dirigidas através de perguntas abertas (gravadas em áudio). As mesmas foram transcritas e analisadas. O local da pesquisa foi o Centro de Referência Maria do Pará. Utilizamos para a análise dos discursos coletados a compreensão de Ricouer (1975) e os conceitos Gestálticos de contato, funções e fronteiras de contato, mecanismos de defesa, self, ajustamento criativo e awareness. O resultado aponta para o desvelamento de vividos permeados de agressões verbais em forma de humilhações, xingamentos, ofensas, ciúmes, desqualificação de sua aparência física, falta de diálogo, isolamento social e emocional, medo, sofrimento, dor, angústia, culpa, vergonha, sentimentos de ódio, raiva, tristeza e impotência diante de tal violência. Concluímos que a “invisibilidade” de tais experiências de violência psicológica gera visíveis interrupções no contato consigo mesma, em suas relações familiares e sociais, bem como, imprime profundas e danosas desestruturações na personalidade e na maneira da mulher expressar sua subjetividade.

A dança como mediadora na formação da criança

This paper analyzes the dance, considered the oldest of the Arts, inserted in Art and Education. When you talk about dance as art, sought to articulate dance, body movement and music, because all these aspects are crucial when it comes to education in dance. Thus, this paper, by analyzing the meaning of dance over time, also made a parallel with the evolution of the concept of body that, throughout history, became the focus of sin, to currently be seen in optical freedom and autonomy, looking up from childhood, the formation of body awareness and embodiment, as a basis for identity and the formation of a positive self-image. In describing the evolution of dance, between different societies, it was shown that the tool is the dancer's own body and that for its use, it is necessary to look at its interior, human vitality, musicality and sensitivity. Proved that dance since the beginning, has been seen as a medium body, as well as desires and deepest sorrows of humanity, linked to religion, ritual or ceremonial, reaching today the freest expression of body, in modern dance. Given these considerations, based on theoretical frameworks, emphasized the importance of dance in middle school, focusing on their educational role and liberating, showing that it must be used as a tool for teaching and learning, and the development of children , given its interdisciplinary character, this Crosscutting Themes in elementary school and early childhood education curriculum benchmark. The paper concludes that, despite legislation and official documents require training for dance in the school curriculum, very little is done in this direction, which shows that there is still a choice of schools, the immobility of the pupils