Estudo da atividade protetora de extratos vegetais contra stresse genotóxico

Dissertação de mestrado, Biologia Molecular e Microbiana, Faculdade de Ciências e Tecnologia, Universidade do Algarve, 2015

A influência da viscosidade dos solos argilosos na consolidação do dique nº 3 da Represa de Lebrija

Dissertação de mestrado, Engenharia Civil (Construção), Instituto Superior de Engenharia, Universidade do Algarve, 2014

Nothing scares us.

Trata el tema de los miedos con humor y de manera tranquilizadora. La historia demuestra con éxito que es normal tener algunos miedos, y que está bien compartirlos con los amigos. Lucy y Lenny son inseparables en sus aventuras. Todo va bien hasta el día Lucy descubre que tiene miedo de una criatura de un programa de televisión. Tiene una viscosa boca verde y chupa hasta los trenes. Ella no quiere descubrir su secreto a Lenny , pero luego descubre que Lenny tiene una debilidad:también él tiene miedo de las arañas.

Preparação e avaliação das propriedades de misturas de polietileno de baixa densidade com polietileno linear de baixa densidade

Misturas de Polietileno de Baixa Densidade (PEBD) com diferentes tipos e proporções de Polietilenos Lineares de Baixa Densidade (PELBD) foram preparadas em extrusora de rosca simples ou dupla a fim de verificar a influência destes últimos nas propriedades das misturas e a eficiência das extrusoras na preparação das mesmas. Para tanto foram utilizados polietilenos lineares comerciais, com estruturas moleculares diversas devido ao tipo de comonômeros de 1-octeno (C8), 1-hexeno (C6) ou 1-buteno (C4) e diferentes processos de polimerização. Polietilenos lineares de baixa densidade e polietileno de baixa densidade puros foram avaliados a fim de relacionar suas propriedades com suas estruturas. As misturas de PEBD com PELBD foram avaliadas através de reometria capilar e rotacional, calorimetria diferencial de varredura (DSC), plastometria e análise dinâmico-mecânica (DMA). As misturas de PEBD com PELBD com comonômero 1-buteno e 1-octeno, preparadas em extrusora de rosca simples ou dupla, não apresentaram diferenças no perfil das curvas de viscosidade, observando-se, entretanto, diferenças no perfil das mesmas para as misturas de PEBD com o PELBD com comonômero 1-hexeno. Verificou-se que os valores de índice de fluidez não variaram linearmente com a adição do PELBD na mistura Verificou-se que a adição de PELBD no PEBD modifica significativamente a viscosidade aparente da mistura na faixa de taxa de cisalhamento avaliada. Os polietilenos lineares de baixa densidade apresentaram deformação majoritariamente viscosa quando submetidos a condições cisalhantes e o módulo de perda G” foi superior ao módulo de armazenamento G’. Verificou-se que com o aumento da massa molar do PELBD e do teor deste na mistura ocorreu um aumento do módulo de perda G”. O aumento de cerca de 2% no teor de comonômero não modifica o comportamento viscoelástico do PELBD puro. Pela avaliação dos termogramas das misturas, observou-se que o aumento da concentração de PELBD, causa uma variação no comportamento térmico das mesmas com o conseqüente alargamento da faixa de fusão. O aumento na massa molar dos PELBD de 67.200 g/mol a 153.500 g/mol não influencia significativamente o comportamento térmicos dos mesmos.

Modelo unidimensional do atrito em escala atômica : um estudo por dinâmica molecular

o trabalho de Krim e Windom [Phys. Rev B 38, 12184(1988)], que revelou a natureza viscosa do atrito em escala atômica, gerou uma intensa atividade tanto teórica quanto experimental. Contudo, questões fundamentais ainda se matém em aberto com opor exemplo a relação entre o coeficiente de atrito viscoso e a topologia do substrato assim como a dependência com a temperatura do substrato. Neste trabalho apresentamos os resultados, obtidos usando dinâmica molecular, para um modelo unidimensional de um sistema adsorvato/substrato. Pesquisamos diferentes relações de comensuração entre o adsorvato e o substrato assim como também a dependência do coeficiente de atrito fonônico, Nph, com a temperatura. Para todas as configurações estudadas obtivemos que o coeficiente de atrito fonônico depende quadráticamente da amplitude de corrugação do substrato, mas tem uma dependência não trivial com a razão de comensuração adsorvato/substrato. O resultado mais impressionante é que para relações de comensuração entre 0.65 e 0.9 o atrito fonônico é muito fraco. Nosso resultados podem explicar as diferencias encontradas na literatura em relação à magnitude do atrito de origem eletrônico e o de origem fonônico.

Adição de vermiculita expandida mícron em pastas de baixa densidade para cimentação de poços de petróleo

The northeastern region of Brazil has a large number of wells producing oil using a method of secondary recovery steam injection, since the oil produced in this region is essentially viscous. This recovery method puts the cement / coating on thermal cycling, due to the difference in coefficient of thermal expansion between cement and metal coating causes the appearance of cracks at this interface, allowing the passage of the annular fluid, which is associated with serious risk socioeconomic and environmental. In view of these cracks, a correction operation is required, resulting in more costs and temporary halt of production of the well. Alternatively, the oil industry has developed technology for adding new materials in cement pastes, oil well, providing high ductility and low density in order to withstand the thermo-mechanical loads generated by the injection of water vapor. In this context, vermiculite, a clay mineral found in abundance in Brazil has been applied in its expanded form in the construction industry for the manufacture of lightweight concrete with excellent insulation and noise due to its high melting point and the presence of air in their layers lamellar. Therefore, the vermiculite is used for the purpose of providing low-density cement paste and withstand high temperatures caused by steam injection. Thus, the present study compared the default folder containing cement and water with the folders with 6%, 8% and 10% vermiculite micron conducting tests of free water, rheology and compressive strength where it obtained the concentration of 8 % with the best results. Subsequently, the selected concentration, was compared with the results recommended by the API standard tests of filtered and stability. And finally, analyzed the results from tests of specific gravity and time of thickening. Before the study we were able to make a folder with a low density that can be used in cementing oil well in order to withstand the thermo-mechanical loads generated by steam injection

Flora Polínica da Reserva do Parque Estadual das Fontes do Ipiranga (São Paulo, Brasil): Família: 136-Solanaceae

Foram estudados os grãos de pólen de 12 gêneros e 41 espécies de Solanaceae ocorrentes na Reserva do Parque Estadual das Fontes do Ipiranga: Acnistus arborescens (L.) Schlecht., Athenaea picta (Mart.) Sendtn., Brunfelsia latifolia Benth., Brunfelsia pauciflora (Cham. & Schlecht.) Benth., Capsicum flexuosum (L.) Sendtn., Capsicum villosum (L.) Sendtn., Cestrum amictum (L.) Schlecht., Cestrum corymbosum (L.) Schlecht., Cestrum lanceolatum (L.) Miers, Cestrum schlechtendalii (L.) G. Don, Cestrum sendtnerianum (L.) Mart. ex Sendtn., Cyphomandra diploconos Sendtn., Cyphomandra velutina Sendtn., Dyssochroma viridiflora (Sims) Ducke, Nicotiana langsdorffii (Weinm.) Roem. & Schult., Physalis peruviana L., Physalis viscosa L., Sessea brasiliensis Tol., Solandra grandiflora Sw, Solanum americanum Mill., Solanum atropurpureum Schrank., Solanum bullatum Vell., Solanum capsicoides Allion., Solanum cernuum Vell., Solanum concinnum Schott ex Sendtn., Solanum didynum Dun., Solanum diflorum Vell., Solanum excelsum St. Hil. ex Dun., Solanum granuloso-leprosum Dun., Solanum hoehnei Morton, Solanum inaequale Vell., Solanum inodornum Vell., Solanum lycocarpum St. Hil. ex Dun., Solanum mauritianum Scop., Solanum paniculatum L., Solanum rufescens Sendtn., Solanum sisymbriifolium Lam., Solanum swartzianum Roem. & Schult., Solanum vaillantii Dun., Solanum variabile Mart., Solanum viarum Dun. São apresentadas descrições para todas as espécies estudadas, ilustrações, observações e seis chaves polínicas.

Degradação foto-fenton de carbono orgânico total em efluentes da indústria de beneficiamento de castanha de caju

At the cashew nut processing industry it is often the generation of wastewaters containing high content of toxic organic compounds. The presence of these compounds is due mainly to the so called liquid of the cashew nut (CNSL). CNSL, as it is commercially known in Brazil, is the liquid of the cashew nut. It looks like an oil with dark brown color, viscous and presents a high toxicity index due to the chemical composition, i.e. phenol compounds, such as anacardic acid, cardol, 2-methyl cardol and monophenol (cardanol). These compounds are bio resistant to the conventional treatments. Furthermore, the corresponding wastewaters present high content of TOC (total organic carbon). Therefore due to the high degree of toxicity it is very important to study and develop treatments of these wastewaters before discharge to the environmental. This research aims to decompose these compounds using advanced oxidative processes (AOP) based on the photo-Fenton system. The advantage of this system is the fast and non-selective oxidation promoted by the hydroxyl radicals (●OH), that is under determined conditions can totally convert the organic pollutants to CO2 and H2O. In order to evaluate the decomposition of the organic charge system samples of the real wastewater od a processing cashew nut industry were taken. This industry was located at the country of the state of Rio Grande do Norte. The experiments were carried out with a photochemical annular reactor equipped with UV (ultra violet) lamp. Based on preliminary experiments, a Doehlert experimental design was defined to optimize the concentrations of H2O2 and Fe(II) with a total of 13 runs. The experimental conditions were set to pH equal to 3 and temperature of 30°C. The power of the lamps applied was 80W, 125W and 250W. To evaluate the decomposition rate measures of the TOC were accomplished during 4 hours of experiment. According to the results, the organic removal obtained in terms of TOC was 80% minimum and 95% maximum. Furthermore, it was gotten a minimum time of 49 minutes for the removal of 30% of the initial TOC. Based on the obtained experimental results, the photo-Fenton system presents a very satisfactory performance as a complementary treatment of the wastewater studied

Tratamento de borra de petróleo com sistemas microemulsionados

During the storage of oil, sludge is formed in the bottoms of tanks, due to decantation, since the sludge is composed of a large quantity of oil (heavy petroleum fractions), water and solids. The oil sludge is a complex viscous mixture which is considered as a hazardous waste. It is then necessary to develop methods and technologies that optimize the cleaning process, oil extraction and applications in industry. Therefore, this study aimed to determine the composition of the oil sludge, to obtain and characterize microemulsion systems (MES), and to study their applications in the treatment of sludge. In this context, the Soxhlet extraction of crude oil sludge and aged sludge was carried out, and allowing to quantify the oil (43.9 % and 84.7 % - 13 ºAPI), water (38.7 % and 9.15 %) and solid (17.3 % and 6.15 %) contents, respectively. The residues were characterized using the techniques of X-ray fluorescence (XRF), Xray diffraction (XRD) and transmission Infrared (FT-IR). The XRF technique determined the presence of iron and sulfur in higher proportions, confirming by XRD the presence of the following minerals: Pyrite (FeS2), Pyrrhotite (FeS) and Magnetite (Fe3O4). The FT-IR showed the presence of heavy oil fractions. In parallel, twelve MES were prepared, combining the following constituents: two nonionic surfactants (Unitol L90 and Renex 110 - S), three cosurfactants (butanol, sec-butanol and isoamyl alcohol - C), three aqueous phase (tap water - ADT, acidic solution 6 % HCl, and saline solution - 3.5 % NaCl - AP) and an oil phase (kerosene - OP). From the obtained systems, a common point was chosen belonging to the microemulsion region (25 % [C+S] 5 % OP and AP 70 %), which was characterized at room temperature (25°C) by viscosity (Haake Rheometer Mars), particle diameter (Zeta Plus) and thermal stability. Mixtures with this composition were applied to oil sludge solubilization under agitation at a ratio of 1:4, by varying time and temperature. The efficiencies of solubilization were obtained excluding the solids, which ranged between 73.5 % and 95 %. Thus, two particular systems were selected for use in storage tanks, with efficiencies of oil sludge solubilization over 90 %, which proved the effectiveness of the MES. The factorial design delimited within the domain showed how the MES constituents affect the solubilization of aged oil sludge, as predictive models. The MES A was chosen as the best system, which solubilized a high amount of aged crude oil sludge (~ 151.7 g / L per MES)

A review of antifertility folkloric plants tested in laboratory animals

The use of natural active principals is widespread among a great proportion of the rural population, or by people who do not have easy access to medical assistance. These active principles are used as food or medicines, and even for purposes of contraception. It becomes necessary to establish a relationship between the folklore habits and current information on the nature of anti-fertility substances, and knowledge of their mechanisms. Anti-fertility agents may exert their actions in a number of areas, (hypothalamus, anterior pituitary, oviduct, uterus, and vagina), inhibiting synthesis and/or liberation of hormones (follicle-stimulating, luteinizing, and steroid hormones), ovulation, ovum transportation, and implantation process. Therefore, a review of literature was carried out, including of several plants used by women as abortifacient and anti-fertility agents to compare their effects with those obtained among laboratory animals.

Mitigação de riscos e catástrofes naturais: análise numérico-experimental de roll waves evoluindo em canais inclinados

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Avaliação do desempenho de compósitos de PPA/Fibra de vidro para aplicação em bombas de óleo de motores de motocicletas

Pós-graduação em Ciência e Tecnologia de Materiais - FC

Estabilidade e controle dinâmico de roll waves

Pós-graduação em Engenharia Elétrica - FEIS

Determinação de macroelementos, oligoelementos e contaminantes metálicos em própolis por espectrofotometria de absorção atômica em chama e em forno de grafite

Pós-graduação em Ciências Farmacêuticas - FCFAR

Aspectos nutricionais na produção e qualidade da goma xantana produzida por Xanthomonas campestris pv. campestris

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)