Sintese e caracterização do compósito TixOy- MWCNT para fotodegradação de carbaril

In this study, a composite of titanium oxide (TixOy) and carbon nanotubes multi-walled (MWCNT) was synthesized on a titanium substrate using the sol-gel method. The electrode obtained (TixOy-MWCNT/Ti) was used to the photodegradation of Carbaryl. The morphology and structure of the TixOy-MWCNT composite were characterized by scanning electron microscopy (SEM), scanning electron microscopy by field emission (FEG-SEM) and X-ray diffraction (XRD). The electrode was evaluated for degradation of Carbaryl (0.9 mmol L-1) in phosphate buffer pH 6, and using chronoamperometry by applying a potential of +1,5 V for 1 h. Using the Ultraviolet-Visible test, the absorbance at 220 nm was collected every 15 min to calculate the percentage of Cabaryl´s degradation. Can be evaluated that the Carbaryl degradation using the TixOy-MWCNT/Ti electrode was 22% more efficient when compared with the electrode without the presence of titanium oxides (MWCNT / Ti)

Motivos de permanências nas vivências em atividades físicas de aventura na natureza

O meio urbano cresce rapidamente a cada dia tomando o lugar das árvores, da vegetação e dos animais silvestres. Esse crescimento, associado ao desenvolvimento de novas tecnologias que visam facilitar o cotidiano das pessoas, muda as práticas habituais, afastando a população citadina das atividades físicas e da natureza. Nesse contexto as atividades realizadas em meio natural vem conquistando um interesse cada vez maior de pessoas, que as procuram por diversas razões. Baseado nessa curiosidade procurou-se investigar os agentes incentivadores à permanência nas práticas do rapel, do cascading e do canyoning. O estudo teve uma natureza qualitativa e constou de pesquisa bibliográfica aliada à pesquisa exploratória, a qual utilizou como instrumento para coleta de dados questionários mistos, aplicados a uma amostra intencional composta por 10 praticantes de cada uma dessas modalidades citadas. Os dados foram analisados descritivamente, pela Técnica de Análise de Conteúdo Temático e indicam que o ambiente natural associado a estas práticas, bem como, a perspectiva de fuga do cotidiano e a possibilidade de ampliação das relações interpessoais, representam algumas das importantes influências para a permanência nas atividades físicas de aventura na natureza.

A competição interespecífica explica a distribuição espacial de macrófitas aquáticas em estuários?

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Glicerina bruta substituindo o milho em dietas de baixo amido na terminação de cordeiros

Pós-graduação em Zootecnia - FCAV

Desempenho de híbridos intraespecíficos de Brachiaria decumbens desenvolvidos por seleção recorrente recíproca

Pós-graduação em Agronomia (Genética e Melhoramento de Plantas) - FCAV

Espectroscopia de impedância eletroquímica da biodissolução da calcopirita na presença de íons ferrosos

Pós-graduação em Química - IQ

Estudo da condutividade elétrica em filmes finos de derivados de politiofeno

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Verificação da eficiência do modelo de Mohler na resposta do comportamento de vigas mistas de madeira e concreto

The aim of this research study was to evaluate the structural behaviour of the wood and concrete composite system for bridge decks with emphasis on the metal shear connectors. Experimental tests were performed on composite specimens and wood and concrete beams with a metallic connector system in an X position, using CS100900-type screws. All specimens and beams were submitted to static loads until failure in order to obtain the strength and stiffness of the connection system. The experimental results for the stiffness of the beams were compared with the analytical results obtained through the Mohler model, presenting good equivalence for service loads. The experimental results obtained demonstrate that the most significant damage in composite systems occurred in the connectors' areas.

Influência de diferentes métodos de esterilização de esmalte dental sobre a sua morfologia, composição química, estrutura e formação de biofilmes in vitro

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

Preparação pelo método poliol modificado, caracterização estrutural e espectroscópia de nanopós de niobato de potássio e neodímio e de suas condições sólidas dopadas em európio

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Seleção de famílias e progênies de irmãos completos de cana-de-açúcar para atributos tecnológicos e de produção pelo método de REML/BLUP

The objective of this study was to assess families and highlight the superior progenies of sugarcane originating from 38 biparental crosses for the following attributes: tons of cane per hectare (TCH), tons of biomass per hectare (TBIOH), brix (% cane juice), fiber content, purity, pol and total recoverable sugar (TRS). The data were analyzed by mixed model REML / BLUP in the REML (Restricted Maximum Likelihood) allowed us to estimate genetic parameters and BLUP (best linear unbiased prediction) to predict the additive and genotypic values. The best family for the attributes TCH and TBIOH was 41, whose parents are cultivars IACSP022019 x CTC9. In individual selection for TCH, the plant number 3 of Block 2, the crossing 78, showed the best results. To TBIOH the plant number 33, Block 1, family 41, showed the best results. Families 40, 41, 43, 68, 69, 79, 91, 92 and 147, were higher for the variables brix, pol, purity, and ATR, where as 85 families, 147, 148, 149, 161, 163, 177, 178, 179, and 183 were higher for fiber. The family 147 whose parents are IACSP042286 x IACSP963055, showed three progenies ranked among the top ten for both brix, and for fiber, which identifies the combination as a potential source of progenies for bioenergy production.

Reporting social behaviours of mixed-species troops formed by Callithrix jacchus and Callithrix penicillata (Primate, Callitrichidae)

In New World primates, mixed-species troops have been reported. Here, we analysed the performance of affiliative and agonistic behaviours of Callithrix jacchus and Callithrix penicillata living in mixed groups. For this purpose, we recorded the interaction of the individuals from two groups located in Bauru city, in the state of Sao Paulo (Brazil). Our data show that in both groups, affiliative behaviours appeared more frequently than agonistic ones. We concluded that there is cohesion inside the mixed-species troops observed. We suggest that a deeper knowledge about the social behaviour of mixed-species troop species certainly may be useful in projects linked with the management of the impact caused by them.

Allometric equations for estimating tree biomass in restored mixed-species Atlantic Forest stands

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

Propriedades ópticas e elétricas de materiais híbridos de sílica/orgânico à base de GPTS:TEOS preparados pelo método sol-gel

Fabrication of optoelectronic devices requires the employment of at least one transparent electrode. Usually, commercially transparent electrodes have been made by deposition of indium tin oxide (ITO) films by RF-Sputtering technique. These commercial electrodes have sheet resistance of about 100 Ω/sq and optical transmittance of 77% at the wavelength of 550 nm. The poly(3,4-ethylenedioxythiophene):polystyrene-sulfonate (PEDOT:PSS) is an alternative material to fabricate transparent electrodes due to its high conductivity (about 600 S/cm) and solubility in water. Soluble conductive materials exhibits advantages for processing of electrode layers, however there is a disadvantage during devices fabrication once materials with the same solvent of the electrode material cannot be coated one over the other. Alternatively, organic/Silica hybrid materials prepared by sol-gel process allow producing bulks and films with high chemical durability. In order to obtain transparent electrodes with high chemical durability, we introduced a blended material comprising the high UV-VIS transparency of organic/Silica sol-gel material and a high conductivity polymer PEDOT:PSS. The organic/Silica sol was obtained using two different molar concentrations (1:1 and 4:1), of tetraethylorthosilicate (TEOS) and 3-glycidoxypropyltrimethoxysilane (GPTS). Amounts of PEDOT:PSS solutions were added to the sol material, resulting in different weight fractions of sol and polymer. G:T/P:P were deposit onto glass substrates by spray-coating. In order to perform electrical characterization of the blended material, gold electrodes were thermally evaporated onto the films. The electrical characterization was performed using a Keithley 2410 source/meter unity and the optical characterization, using a Cary50 UV-Vis spectrophotometer. The absorption coefficient and electric conductivity of the different compositions blends, as function of the PEDOT:PSS concentration, were...

Otimização dos parâmetros para obtenção de nanotubos em Ti-Cp por anodização eletroquímica e aplicação na liga experimental Ti-35Nb-7Zr

Pós-graduação em Engenharia Mecânica - FEG