Monte Carlo simulation applied in total reflection X-ray fluorescence: Preliminary results

The X-ray Fluorescence (XRF) analysis is a technique for the qualitative and quantitative determination of chemical constituents in a sample. This method is based on detection of the characteristic radiation intensities emitted by the elements of the sample, when properly excited. A variant of this technique is the Total Reflection X-ray Fluorescence (TXRF) that utilizes electromagnetic radiation as excitation source. In total reflection of X-ray, the angle of refraction of the incident beam tends to zero and the refracted beam is tangent to the sample support interface. Thus, there is a minimum angle of incidence at which no refracted beam exists and all incident radiation undergoes total reflection. In this study, we evaluated the influence of the energy variation of the beam of incident x-rays, using the MCNPX code (Monte Carlo NParticle) based on Monte Carlo method. © 2013 AIP Publishing LLC.

Previous contact with Strongyloides venezuelensis contributed to prevent insulitis in MLD-STZ diabetes

Epidemiological and experimental studies support the idea that helminth infections can induce a protective effect against the development of autoimmune and allergic diseases. In this study we characterized the immune response induced by Strongyloides venezuelensis infection in C57BL/6 mice and then evaluated the effect of a previous contact with this helminth in the outcome of type 1 diabetes. Animals were initially infected with 2000 L3 larvae from S. venezuelensis and euthanized 22. days later. An acute phase, identified by a high amount of eggs per gram of feces, was established between days 7 and 9 post-infection. Recovery from infection was associated with a Th2 polarized response characterized by a significant level of serum IgG1 specific antibodies and also a significant production of IL-5 and IL-10 by spleen cells stimulated with S. venezuelensis soluble antigen. Immunization with soluble S. venezuelensis antigen associated with complete Freund's adjuvant followed by infection with S. venezuelensis protected mice from diabetes development induced by streptozotocin. Protection was characterized by a higher body weight gain, lower glycemic levels, much less severe insulitis and preserved insulin production. Together, these results indicate that S. venezuelensis contributed to protect C57BL/6 mice against experimental diabetes induced by streptozotocin. © 2013 Elsevier Inc.

Laser stimulated light reflection for TeO2-WO 3-Bi2O3 thin films with incorporated Si nanoparticles

A novel method of preparation of the Si nanoparticles (NPs) incorporated in tellurite TeO2-WO3-Bi2O3 (TWB) thin films is proposed. This mew method applies RF magnetron sputtering technique at room temperature. The incorporation of Si NP was confirmed by transmission electron microscopy (TEM); isolated Si NPs with diameters of around 6 nm are observed. Energy dispersive X-ray spectroscopy (EDS) was performed during TEM analysis in order to confirm the presence of Si NP and also the other elements of the thin film. The thin films are explored with respect to the photoinduced changes of the reflectivity within the 400-65 nm spectra range using a 10 ns pulsed Nd:YAG with power densities varying up to 400 MW/cm2 and beam diameter within the 3-5 mm range. The observed processes are analyzed within a framework of trapping level conceptions for the Si NP. The possible application of the discovered materials as optical sensitive sensors is proposed. © 2013 Elsevier B.V.

A dança a dois: processos de criação em dança contemporânea

Pós-graduação em Artes - IA

Flicts, livro de artista

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Um processo criativo em dança contemporânea: a simbiose pedra/osso na conexão entre os princípios da Eutonia e os fatores do movimento

Pós-graduação em Artes - IA

Relações obrigacionais entre a ética, o direito e o meio ambiente

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

O brincar como experiência: um estudo com crianças de primeira série de uma escola pública rural

Pós-graduação em Educação - IBRC

Práticas educativas: a relação entre cuidar e educar e a promoção do desenvolvimento infantil à luz da psicologia histórico-cultural

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Representações de professores de língua portuguesa em formação acerca da profissão docente: medicações entre a teoria e prática

Pós-graduação em Educação - FFC

Interação verbal e atividade prática experimental investigativa: dimensões para repensar a formação inicial de professores de Química

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Crenças de uma professora e de seus alunos acerca do processo de ensino e aprendizagem de inglês em escola pública: contribuições para formação continuada

Pós-graduação em Estudos Linguísticos - IBILCE

Heterogeneidade e interdisciplinaridade na escola especial: a música como forma de proporcionar equilíbrio e qualidade de vida

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Direitos humanos e gênero na educação infantil: concepções e práticas pedagógicas

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)