Validação de uma câmara para exposição experimental a vapores, pela via respiratória, pelo sistema nose only exposure system

A exposição experimental a vapores de solventes pela via respiratória pode ser realizada em câmaras de dois tipos: a que expõe todo o animal por imersão na atmosfera experimental e aquela em que a exposição se dá apenas pelo nariz. O sistema para exposição apenas pelo nariz, denominado de NOES- Nose Only Exposure System, tem as vantagens de utilizar menos material, ter uma atmosfera continuamente renovada, produzir exposição mais uniforme entre os animais, ser mais facilmente controlado e evitar a penetração dos solventes por outras vias. A desvantagem está no fato na restrição do tempo do experimento por provocar estresse ao animal. O projeto experimental consistiu na validação de uma câmara de exposição para ratos, do tipo NOES, dotada de 44 portas, através da avaliação da homogeneidade e da estabilidade das concentrações de voláteis na atmosfera a ser inalada, utilizando etanol combustível como agente químico para os testes. Os resultados indicaram que a variabilidade das concentrações entre os planos da câmara (portas da camada superior e inferior), entre portas de exposição e, também, entre as médias apuradas para cada tempo não diferem expressivamente entre si. Assim, pode-se considerar que o equipamento mostrou-se adequado para manter a homogeneidade e a estabilidade das concentrações durante as 6 horas de experimentação, para o etanol combustível

Análise das propriedades físicas em estrutura do tecido ósseo de eqüinos

This project has several objectives: To determine medium values and variations of the density, porosity, humidity, shrinkage volume and the coefficient of mass attenuation of gamma radiation of 59,6 keV of the radioisotope 241Am, using samples of equine radio, in growth and adult. The samples of bones were supplied by the Department of Pathology of University of Veterinary Medicine and Zootechnics - UNESP campus Botucatu. Bones of the paws front left of two males were used. Of each bone ten samples were removed. Those samples were prepared to just obtain compact bony fabric, being submitted to the rehearsal of determination of the density by the immersion method in water and determination of the coefficient attenuation lineal for the method of attenuation of the radiation of the 241Am, also obtaining your humidity content. Still, they were obtained new samples starting from the ground samples and verified the density of the particles present in that, obtaining the medium value of the coefficient of mass attenuation. The results showed the medium values and significant statistical variations of the density, porosity, humidity, shrinkage volume and coefficient of mass attenuation of gamma radiation of 59, 6 keV of the radioisotope 241Am in the samples, establishing some relationships between of the certain physical parameters with biological aspects and possible existent influences between them

Determinação de manganêsem águas no entorno de minerações de urânio

The studies of this work aimed to determine the labile fractions of manganese (Mn) in natural and drainage water samples collected around the Osamu Utsumi uranium mine, located in the municipality of Caldas, south-central region of Poços de Caldas- MG, using the technique of diffusion gradient in thin films (DGT). The DGT devices were mounted with Chelex-100 resin, polyacrylamide-agarose hydrogel (conventional porosity) and cellulose acetate membrane. The device were deployed up to 48 hours in six water samples collected from different areas around the uranium mine (075, 076, 022-E, 025-E, 014, and 041). The DGT devices immersed in each sample were gradually removed after 4, 8, 12, 24 and 48 hours. The pH of the samples ranged from 3.0 to 10.5, which influenced the lability and the sampling of the analyte by the Chelex-100 resin. The results showed a linear relationship between accumulated mass and sampling time (immersion curve) for samples 014 and 025-E (pH between 6 and 8) suggesting the ability of the DGT technique for sampling the analyte. The results obtained for samples 075 and 076 (pH<5) and samples 041 and 022-E (pH around 10) were characterized by nonlinear relationships. The values obtained by DGT were compared with Solid Phase Extraction (SPE) technique using Chelex-100. For samples 014 and 025-E, there was a good agreement between the results obtained by both techniques

Gestos, expressões e emoções: quando a linguagem corporal permeia as relações públicas

De quanto vale um pequeno gesto, um sorriso, um olhar? São estes detalhes que nascem da linguagem corporal é que estarão presentes neste trabalho. Este projeto foi construído a partir do desejo de se provar que a mensagem presente sob as palavras tem um grande e belo papel para o diálogo e as relações humanas. É com esse propósito que, inicialmente, buscaremos o homem na raiz de sua linguagem, numa trajetória cultural e evolutiva das expressões e da utilização do corpo humano nos rituais de interação. Aos poucos, este mesmo homem se descobre um ser simbólico, com sua capacidade de interpretar símbolos e sinais por meio de um mundo de representações, que fez com que o ser humano procurasse sair da solidão em busca da formação de comunidades. Neste momento, o corpo marca importante papel comunicativo, já que exerce sua função unificadora nas variadas dimensões interpessoais. A partir dessa particularidade, buscaremos o homem imerso na coletividade das organizações, comunicando seus estados emocionais e fazendo uso do não-verbal para reeducar o seu comportamento como trabalhador, mas principalmente, como homem. Este trabalho propõe, assim, analisar a importância de dimensões esquecidas da comunicação que permeiam a percepção dos sentidos, dos afetos, das emoções e da cordialidade entre os sujeitos. Neste sentido, o profissional de Relações Públicas quer fomentar em si – e no outro – o desejo de resgatar valores adquiridos ao longo da história humana, para se fazer presente como sujeito e compreender o outro, de corpo, alma e em todas as suas dimensões

Determinação de Cd, Cu, Ni, Pb e Zn em águas marinhas oriundas da Bacia Potiguar utilizando a técnica de difusão em filmes finos por gradiente de concentração (DGT)

The DGT technique has been used to determine and better understand the dynamics and bioavailability of metals in the sea near to marine outfalls. In this work, the DGT was assessed for the determination of Cd, Pb, Cu, Zn and Ni in marine water samples from Potiguar Basin in its conventional aspect (binding agent, Chelex-100 and diffusive agent: Diffusive polyacrylamide gel (D) and restrictive (R)) and determination of Pb and Cd through its alternative aspect (binding agent: Saccharomyces cerevisiae immobilized in agarose gels and diffusive agent: 3MM Chromatography Paper). The deployment curves for long periods of immersion in the sample, showed a good linear correlation for the conventional aspect to Zn (D: R²=0.9586, R: R²=0.9444), Ni (D: R²=0.9789, R: R²=0.9286) and Cu (D: R²=0.764, R: R²=0.8143), and alternative to Pb (R²=0.9228) and Cd (R²=0.9673). The results of the organic and inorganic composition analysis in conventional aspect, showed that for every element there is no significant fraction of organic compounds in the sample. In addition, considering the alternative aspect, the comparison of obtained and expected masses suggests that some of the Pb is not labile and that the main retention mechanism of Pb for S. Cerevisiae occurs through ion exchange

Avaliação do efeito ambiental nas propriedades mecânicas e viscoelásticas de compósitos híbridos de titânio/fibra de carbono/resina epóxi

Hybrid composites combining metal plates and laminates with continuous fiber reinforced polymer, called fiber-metal (CHMF), have been particularly attractive for aerospace applications, due mainly to their high mechanical strength and stiffness associated with low density. These laminates (CHMF) consist of a sandwich structure consisting of layers of polymer composites and metal plates, stacked alternately. This setting allows you to combine the best mechanical performance of polymer composites reinforced with long fibers, to the high toughness of metals. Environmental effects should always be considered in the design of structural components, because these materials in applications are submitted to the effects of moisture in the atmosphere, the large cyclical variations of temperature around 82 ° C to -56 ° C, and high effort mechanical. The specimens of fibermetal composite were prepared at EMBRAER with titanium plates and laminates of carbon fiber/epoxy resin. This study aims to evaluate the effect of different environmental conditions (water immersion, hygrothermal chamber and thermal shock) of laminate hybrid titanium/carbon fiber/epoxy resin. The effects of conditioning were evaluated by interlaminar shear tests - ILSS, tensile, and vibration free

Projeto Meraki

We realize this days a spacing of individuals, on what concerns their relationships with others. At the same time, the technologies and the possibilities of virtual interaction are more and more present and developed. At this point, we draw a connection between the virtual immersion and the detachment from personal and face to face relationships. Wear this reality, this project proposes a discussion of the communications while transmitting messages and content, as well as a basis for social relations developed between individuals in a given society. From this analysis, we depart for the development of an action joining the Public Relations and Design, while communication areas that when involved, enable the development of an empirical theory for the increased use of social relations, through the feelings

Avaliação da membrana de troca aniônica DE 81 como ligante ba técnica de difusão em filmes finos por gradientes de concentração (DGT) para a determinação de Cromo VI

It is known that there is a wide variety of bioavailable trace metals in aquatic systems, and its determination is fundamental to predict impacts to organisms in these environments. However, the determination of the total concentration of chemicals in aquatic systems, despite its importance, does not provide necessary information for decision making or even may lead to misinterpretation of the procedures and potential risks to the system in question. This study aimed to use the technique of diffusion in thin films by concentration gradients (DGT) to evaluate the anion exchange membrane Whatman DE 81 as binder alternative in determining Cr (VI). Experiments were carried out to determine the diffusion coefficients for the material used diffusion (agarose gel). The behaviors of the binders were analyzed before the main variables of the systems, immersion time, pH and ionic strength. Then was made the assessment of potential interferences, to finally proceed with testing using actual samples in the laboratory and in situ

Crescimeno de apatita na superfície da liga Ti-7, 5Mo empregando tratamento higrotérmico

The objective of the present work was to evaluate surface of experimental alloy Ti-7.5Mo after hydrothermal treatment. Ingots were obtained in arc melting furnace under an argon atmosphere and then homogenized under vacuum at 1100ºC for 86.4 ks to eliminate chemical segregation and after cold worked discs were cutting and grinding. For surface treatment, samples were immersed in a container with NaOH aqueous solution 5M, autoclaved, washed with distilled water. Followed, samples were heat treated and they were soaking in 5xSBF to form an apatite layer on the surface. Surfaces were investigated by, scanning electron microscopy, X-Rays powder diffraction, atomic force microscopy and contact angle, in order to evaluate the wettability of the alloy surface. The results were compared with our previous studies using the group of chemical surface treatments and results shows better condition is 120 minutes in the autoclave

Influência do etil-trinexapac no crescimento inicial do eucalipto

Pós-graduação em Agronomia (Produção Vegetal) - FCAV

Crescimento de apatita na superfície da liga Ti-25Ta empregando dois tipos de tratamento de superfície: biomimético e deposição de polímero por eletrofiação

Titanium and its alloys has been widely used as materials for metallic biomaterials implants are usually employed to restore the hard tissue function, being used for artificial joints and bones, synthetic plates, crowns, dental implants and screws . Objective of this work was the surface modification of Ti-alloy 25Ta from biomimetic surface treatment of employment and deposition of polymer by electrospinning. The league was obtained from the fusion of the pure elements in the arc furnace with controlled atmosphere. The ingots were subjected to heat treatment, cold forged and sectioned discs with 13 mm diameter and 3 mm thick. Two surface treatments was evaluated, biomimetic and electrospinning with PCL fiber. The biomimetic treatment was performed involving alkaline treatment for three molarities 1.5M, 3M and 5M with immersion in SBF. The electrospinning was performed using PCL polymer alloy surface after the alkali treatment Ti25Ta 1M. For this group the polymer coated surfaces were immersed in calcium phosphate containing solution for immobilization of apatite. The results were compared with previous studies using surface treatment group to verify hydroxyapatite formation on the sample surface and it is concluded that the best condition is biomimetic treatment with 5M alkali treatment and heat treatment at 80 ° C for 72 hours

Confecção e avaliação de chapas de madeira aglomerada com aproveitamento de resíduos de marcenaria industrial

Pós-graduação em Engenharia Civil - FEIS

Efeito de diferentes antibióticos no processo de reparo em reimplante de dentes mantidos em leite: estudo em ratos

Pós-graduação em Odontologia - FOA

Estudo da modificação superficial de fibras de carbono por meio de tratamentos a plasma para o aumento da adesão na interface de compósitos fibra de carbono/PPS

Pós-graduação em Engenharia Mecânica - FEG