Theoretical and experimental study of the relation between photoluminescence and structural disorder in barium and strontium titanate thin films

Thin films of barium and strontium titanate (BST), synthesized by the polymeric precursor solution and spin coated on [Pt (140nm)/Ti (10 nM)/SiO2(1000 nm)/Si] substrates were found to be photoluminescent at room temperature when heat treated below 973 K, i.e. before their crystallization. First principles quantum mechanical techniques, based on density functional theory (DFT) were employed to study the electronic structure of two periodic models: one is standing for the crystalline BST thin film and the other one for the structurally disordered thin film. The aim is to compare the photoluminescence (PL) spectra of the crystalline and disordered thin films with their UV-vis spectra and with their computed electronic structures. The calculations show that new localized states are created inside the band gap of the crystalline model, as predicted by the UV-vis spectra. The study of the charge repartition in the structure before and after deformation of the periodic model shows that a charge gradient appears among the titanate clusters. This charge gradient, together with the new localized levels, gives favorable conditions for the trapping of holes and electrons in the structure, and thus to a radiative recombination process. Our models are not only consistent with the experimental data, they also allow to explain the relations between structural disorder and photoluminescence at room temperature. (c) 2005 Elsevier Ltd. All rights reserved.

Site-specific concentrations of carotenoids in adipose tissue: relations with dietary and serum carotenoid concentrations in healthy adults

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

Western blot analysis of tick antigens from a Rhipicephalus sanguineus unfed larval extract and identification of antigenic sites in tick sections using immunohistochemistry. A comparative study between resistant and susceptible host species

Most parasite-host relationships are characterized by the development of resistance by the host, thus limiting the number of parasites. However, some cases are very unusual. In the relationship of the domestic dog with the brown dog-tick Rhipicephalus sanguineus this does not occur, whereas guinea pigs develop efficient resistance. Sera from domestic dogs, crab-eating foxes and guinea pigs collected before and after infestation with R. sanguineus ticks, and after immunization with a whole tick adult or larval homogenate, were used in Western blot analysis to compare and identify potential important antigens from a tick larval homogenate. The same sera were tested in an indirect immunohistochemistry assay in an attempt to compare relevant antigenic sites on histological tick sections. The immunoblotting displayed antigens recognized only by the guinea pigs, as well as several shared antigens between host species, depending on the kind of immunization. Immunohistochemistry revealed probable antigenic sites on the cells and tissues of ticks, which varied depending on the kind of immunization (infestation or vaccination) and the animal species involved.

Relations between two-dimensional models from dimensional reduction

In this work we explore the consequences of dimensional reduction of the 3D Maxwell-Chern-Simons and some related models. A connection between topological mass generation in 3D and mass generation according to the Schwinger mechanism in 2D is obtained. In addition, a series of relationships is established by resorting to dimensional reduction and duality interpolating transformations. Non-Abelian generalizations are also pointed out.

The intergovernmental allocation of revenue from natural resources: finding a balance between centripetal and centrifugal pressure

Includes bibliography

Trade and investment promotion between Asia-Pacific and Latin America: present position and future prospects

Includes bibliography

Proactive management of extreme prematurity: Disagreement between obstetricians and neonatologists

Objective: To verify, in extremely preterm infants, if disagreement between obstetricians and neonatologists regarding proactive management is associated with early death.Study Design: Prospective cohort of 484 infants with 23 0/7 to 266/7 weeks, without malformations, born from January 2006 to December 2009 in eight Brazilian hospitals. Pro-active management was defined as indication of ≥1 dose of antenatal steroid or cesarean section (obstetrician) and resuscitation at birth according to the international guidelines (neonatologist). Main outcome was neonatal death in the first 24 h of life.Result: Obstetricians and neonatologists disagreed in 115 (24%) patients: only neonatologists were proactive in 107 of them. Disagreement between professionals increased 2.39 times the chance of death in the first day (95% confidence interval 1.40 to 4.09), adjusted for center and maternal/neonatal clinical conditions.Conclusion: In infants with 23 to 26 weeks of gestation, disagreement between obstetricians and neonatologists, translated as lack of antenatal steroids and/or vaginal delivery, despite resuscitation procedures, increases the odds of death in the first day. © 2012 Nature America, Inc.

The relations between different levels of government in Argentina

Includes bibliography

The relations between different levels of government in Brazil

Includes bibliography

O jornalismo e a literatura em Otto Lara Resende

Pós-graduação em Letras - IBILCE

A língua kaingáng da aldeia paulista Icatu: uma descrição funcional

Pós-graduação em Estudos Linguísticos - IBILCE

Ensino de discriminações de palavras com Onset/Rime e a emergência da leitura recombinativa em inglês da simbologia braille e do alfabeto romano em relevo em cegos

Estudos recentes têm documentado que o ensino explícito de discriminação de sílabas promove a emergência da leitura das sílabas de ensino e das sílabas com recombinação das letras das sílabas de ensino. Promove também prontamente a leitura de palavras, formadas pelas sílabas de ensino e recombinadas. Estudos têm demonstrado a leitura de palavras novas com recombinação de onset e rime como fator facilitador quando a língua inglesa é ensinada como língua materna. O aprendizado do inglês por cegos tem sido documentado como um fator de inclusão. O presente estudo investigou se o ensino de discriminação de palavras com segmentação onset/rime facilita a leitura de novas palavras em inglês, como língua estrangeira, usando o Braille e o alfabeto romano em relevo. Três cegas, leitoras fluentes em Braille, participaram. O estudo compreendeu três etapas. Etapa I: Etapa Ia (auditivo/Braille), Etapa Ib (Braille/alfabeto romano em relevo) e Etapa Ic (auditivo/alfabeto romano em relevo). A Etapa I (a e b) compreendeu um pré-teste, fases de ensino de discriminações condicionais de palavras simples e testes de leitura textual das palavras simples e recombinadas. Na Etapa Ic era aplicado um teste de discriminações condicionais. Nas Etapas II e III eram aplicados testes de leitura textual das palavras simples recombinadas (Etapa II) e compostas (Etapa III) e nomeação de objetos. Eram testadas as relações entre palavras ditadas e objetos (AB), palavras ditadas e palavras impressas (AC), objetos e palavras impressas (BC) e palavras impressas e objetos (CB) que documentam a leitura com compreensão das palavras impressas em Braille e no alfabeto romano em relevo, e ainda, a emergência de cópia e ditado. As três participantes atingiram o critério de acertos em todas as fases em todas as etapas. Os resultados mostraram que o ensino de discriminações de palavras com a segmentação onset/rime facilita a emergência da leitura recombinativa em inglês, como língua estrangeira, com cegos falantes do português, usando o Braille e o alfabeto romano em relevo, mostraram ainda a emergência da leitura com compreensão com os procedimentos de equivalência de estímulos. Estes resultados indicam que novas tecnologias de ensino, que permitam uma maior inclusão de pessoas cegas na comunidade, podem ser geradas.

Se (eu) não me engano... condicionalidade na modalização?

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

The Relationship between Authors and Main Thematic Categories in the Field of Knowledge Organization: A Bibliometric Approach

This is a study about the relationships between authors and the main thematic categories in the papers published in the last five International ISKO Conferences, held between 2002 and 2010. The aim is to map the domain as ISKO conferences are considered the most representative forum in the field. The published papers are considered to indicate the relationships between authors and themes. The Classification Scheme for Knowledge Organization Error! Bookmark not defined Literature (CSKOL) was used to categorize the papers. The theoretical and methodological foundations of the study can be found in the concept of domain analysis proposed by Hjorland. The analysis of the papers (n=146) led to the identification of the most productive authors, the networks representing the relationships between the authors as also the categories that constitute the primary areas of research.

Multifuncionalidade e intersubjetividade em construções concessivas: uma análise em ocorrências do português contemporâneo do Brasil

Pós-graduação em Linguística e Língua Portuguesa - FCLAR