Intense and broad photoluminescence at room temperature in structurally disordered Ba[Zr0.25Ti0.75]O-3 powders: An experimental/theoretical correlation

Intense and broad photoluminescence (PL) emission at room temperature was observed on structurally disordered Ba[Zr0.25Ti0.75]O-3 (BZT) powders synthesized by the polymeric precursor method. BZT powders were annealed at 573 K for different times and at 973 K for 2 h in oxygen atmosphere. The single-phase cubic perovskite structure of the powder annealed at 973 K for 2 It was identified by X-ray diffraction and Fourier transform Raman techniques. PL emission increased with the increase of annealing time, which reached its maximum value in the powder annealed at 573 K for 192 h. First principles quantum mechanical calculations based on density functional theory (B3LYP level) were employed to study the electronic structure of ordered and disordered models. The theoretical calculations and experimental measurements of Ultraviolet-visible absorption spectroscopy indicate that the presence of intermediary energy levels in the band gap is favorable for the intense and broad PL emission at room temperature in disordered BZT powders. The PL behavior is probably due the existence of a charge gradient on the disordered structure, denoted by means of a charge transfer process from [TiO5]-[ZrO6] or [TiO6]-[ZrO5] clusters to [TiO6]-[ZrO6] clusters. (C) 2008 Elsevier Ltd. All rights reserved.

Le promeneur littéraire dans le romantisme français

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Virulência de Thyrinteina arnobia virus (TaV) e de Bacillus thuringiensis à Thyrinteina arnobia (Lepidoptera: Geometridae): efeito da temperatura no desenvolvimento das lagartas e do pH da calda de pulverização

Pós-graduação em Agronomia (Proteção de Plantas) - FCA

Avaliação do TaV (Thyrinteina arnobia vírus) no controle de Thyrinteina arnobia (Lepidoptera: geometridae)

Pós-graduação em Agronomia (Proteção de Plantas) - FCA

Construction and validation of an instrument to assess the reading comprehension of students from the third to the fifth grades of elementary school

Objetivo:Este estudo teve como objetivo construir e validar um instrumento de avaliação da compreensão de leitura a fim de caracterizar o perfil de leitura e detectar dificuldades de compreensão em escolares do terceiro ao quinto ano do Ensino Fundamental.Métodos:Participaram 378 escolares divididos em trés grupos para avaliação da compreensão de proposições literais e inferenciais de micro e macroestruturas de dois textos expositivos e dois textos narrativos por meio de questões de múltipla escolha.Resultados:Os dados analisados estatisticamente indicaram valores do teste alfa de Cronbach apresentando consisténcia interna nos quatros textos aplicados para os trés grupos.Conclusão:Foi possível constatar que os escolares apresentaram menor número de erros com o aumento da escolarização e que cada tipo de texto apresentou uma dificuldade específica para os escolares.

Percepção viso-motora de escolares com Transtorno do Déficit de Atenção com Hiperatividade

PURPOSE: The aim of this study was to characterize and to compare the visual-motor perception of students with Attention Deficit with Hyperactivity Disorder (ADHD) with students with good academic performance. METHODS: Forty students from 2nd to 5th grades of an elementary public school, male gender (100%), aged between 7 and 10 years and 8 months old participated, divided into: GI (20 students with ADHD) and GII (20 students with good academic performance), paired according to age, schooling and gender with GI. The students were submitted to Developmental Test of Visual Perception (DTVP-2). RESULTS: The students of GI presented low performance in spatial position and visual closure (reduced motor) and inferior age equivalent in reduced motor perception, when compared to GII. CONCLUSION: The difficulties in visual-motor perception presented by students of GI cannot be attributed to a primary deficit, but to a secondary phenomenon of inattention that interferes directly in their visual-motor performance.

Sour taste and cold temperature in the oral phase of swallowing in patients after stroke

PURPOSE: To determine the effect of sour flavor and cold temperature on oral transit time during swallowing. METHODS: Participants were 52 subjects (28 male and 24 female) with ages between 50 and 80 years (median=66 years), after ischemic stroke involving right or left side damage and mild to moderate oropharyngeal dysphagia. Videofluoroscopy was performed to analyze the swallowing times. Each subject was assessed during swallowing of a paste consistency bolus offered in 5 ml spoons, with a total of four different stimuli (natural, cold, sour and sour-cold). After the exam, the oral transit time was measured using specific software. The oral transit time (starting at the beginning of the bolus movement in the mouth) and the total oral transit time (starting at the moment that the bolus is placed in the mouth) were measured. RESULTS: The association between sour and cold stimuli caused a significant decrease of oral transit time and total oral transit time. CONCLUSION: Sour flavor and cold temperature reduced oral transit time in stroke patients.

Dry matter yield and tillering of brachiarias sown at depths intercropped with corn

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

Intervention program efficacy for spelling difficulties

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

Association between pharyngeal residue and posterior oral spillage with penetration and aspiration in Stroke

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

Preschool Language Assessment Instrument, second edition, in Brazilian Portuguese-speaking children

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

Cross-cultural adaptation of Preschool Language Assessment Instrument: Second Edition

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

Militarismo, conflitos e indisciplina nas práticas policiais em São Paulo, Primeira República

This article examines the challenges involved in the process of police militarization and implementation of police discipline in the State of São Paulo during the First Brazilian Republic (1889 to 1930). Th e implementation of a militarized police model, initiated by the 1906 French Military Mission, was not fully able to deal with indiscipline issues among policemen. Beyond creating problems of its own, such as fostering a corporatist culture and strengthening rigid hierarchies, military discipline prevented police forces to address new issues that would aff ect its practices. Documents in the São Paulo State Public Archive provides a window to the daily violence, the personal compromises, the institutional confl icts and the political meddling that was part of police life in the State of São Paulo at the turn of the century.

Intelectuais, literatura e imprensa no pós-golpe

Culture and the arts in Brazil were impacted directly by the military coup from 1964 onwards. In spite of repression and censorship, the activity of intellectuals and artists in the pre-1964 period was not interrupted nor became stagnant, but gained even greater force due to the presence of control and restrictions by the institutions of repression over against the freedom of creation and thought. As in many sectors of cultural production, literature played a vigorously combative role against the arbitrariness of the regime and implemented “projects of resistance” on the basis of key elements of representation. This occurred, for instance, through the writing and circulation of works such as Pessach: a travessia, by journalist Carlos Heitor Cony, and Quarup, by journalist Antonio Callado. The two novels enabled a broad debate on the narrative form and the scope of involvement in the literature of the 1960s, such as the confrontation between Paulo Francis and Ferreira Gullar in the pages of Revista Civilização Brasileira, which is the focus of this article.

Efeitos associados de genótipos de eucalipto sobre Thyrinteina arnobia (Stoll) (Lepidoptera: Geometridae) e no predador Podisus nigrispinus (Dallas) (Heteroptera: Pentatomidae)

Pós-graduação em Agronomia (Entomologia Agrícola) - FCAV