Avaliação da resistência de união metalocerâmica em função de diferentes tempos de oxidação prévia

Avaliou-se a resistência de união metal/porcelana utilizando-se uma liga de Ni-Cr, submetida a diferentes tempos de oxidação prévia com o sistema cerâmico Vita-VMK, através do teste preconizado por CHIODI NETTO3. A análise dos resultados permitiu as seguintes conclusões: a ausência da oxidação prévia possibilitou os melhores resultados, sendo que a diferença foi estatisticamente significante; diferentes tempos de oxidação prévia provocaram redução acentuada nos valores obtidos e foram semelhantes entre si; o grupo submetido ao processo de jateamento após a oxidação prévia por cinco minutos mostrou resultados similares aos grupos que também passaram pelo processo de oxidação e não sofreram jateamento posterior.

Determinação altimétrica através do sistema de posicionamento global

Este estudo tem por objetivo verificar a influência do tempo de coleta de dados com receptores GPS nas determinações altimétricas. O levantamento altimétrico é realizado através do método de posicionamento relativo estático, utilizando dois receptores GPS de uma freqüência, em diferentes tempos de ocupação (30, 15, 10 e 5 minutos) com uma taxa de gravação de dois segundos. As altitudes obtidas com receptores GPS são comparadas com as altitudes determinadas por nivelamento trigonométrico com Estação Total. Os resultados mostraram que os tempos de ocupação menores que 30 minutos (15, 10 e 5 minutos) também são adequados para a obtenção de diferenças centimétricas nas altitudes analisadas. Mesmo considerando a precisão dos métodos topográficos convencionais, este estudo demonstra a possibilidade da utilização do Sistema de Posicionamento Global (GPS) de forma precisa nos levantamentos altimétricos, desde que se efetue a modelagem da ondulação geoidal.

Ocupação e hipertensão

Com base em revisão bibliográfica discute-se a literatura produzida nas décadas de 70 e 80, no campo da epidemiologia da hipertensão arterial sistêmica entre trabalhadores. Analisa-se não apenas o ponto de vista do conhecimento gerado, mas também os aspectos relacionados ao instrumental teórico-metodológico empregado.

Da licenciatura à sala de aula: o processo de aprender a ensinar em tempos e espaços variados

Formação de professores é um desafio que ultrapassa fronteiras de espaço e tempo. No caso da formação inicial, as dificuldades de articular necessidades formativas oriundas do campo de atuação às possibilidades dos cursos que formam o professor se mantêm. Buscando contribuir para minimizá-las, realizou-se uma investigação, cujos objetivos foram: investigar processos de aprendizagem da docência e evidenciar concepções de futuros professores sobre a sua profissão. Formulou-se um questionário com perguntas abertas, respondido por vinte estudantes do último ano de licenciatura de uma universidade pública do interior paulista, de cursos distintos. Os dados foram analisados em seis eixos temáticos, resultando em significativas constatações, das quais se destaca a falta de saberes relativos à especificidade da profissão docente e ao contexto sócio-histórico no qual ela acontece, comprometendo a ação futura do professor e, consequentemente, a aprendizagem do aluno da escola básica. Cabe, pois, repensar a formação docente, numa época em que seu redimensionamento por meios tecnológicos é possível.

Influência dos tipos de óleos e tempos de fritura na perda de umidade e absorção de óleo em batatas fritas

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

Digestilidade in vitro do bagaço de cana-de-açúcar hidrolisado, submetido a diferentes tempos de estocagem e de adaptação ao bovino doador de fluido ruminal

An experiment was conducted to study the in vitro digestibility of dry matter (IVDMD) and gross energy (IVGED) of hydrolyzed sugarcane bagasse with different storage times and two periods of adaptation of the bovine to the diet. A completely randomized design with four treatments and five replications was used. Treatments A,B,C, and D which corresponded to the times of 0, 15, 30, and 45 days of storage time period of the bagasse, respectively. Each treatment was studied at 7 and 45 after adaptation of the bovine ruminal donor to the diet. After 30 days storage, the bagasse IVDMD was inpaired for both 7 and 45 days of adaptation. Averages values of 25.8; 25.9; 23.1 and 23.3% were obtained for IVDMD with seven days of adaptation, and 25.04; 21.6; 12.5 and 11.4% with 45 days of adaptation for storage periods of 0; 15; 30 and 45 days, respectively. For IVGED, the averages obtained were 33.4; 27.8; 30.9; and 27.2% with seven days, and 30; 26.6; 20.6 and 14.5% with 45 days of adaptation for storage periods of 0, 15, 30 and 45 days, respectively.

Potencialidade energética em diferentes extratores e tempos de extração do óleo de pinhão-manso (jatropha curcas l.) em soxletter

The current rhythm of petroliferous exploration is esteem that the existing reserves will be depleted in next the 45 years. Thus being, it has that to study intensely, what it has come to be fact, the alternative power plants, as well as the technologies economically capable to ultilizar them. The potential demand of biodiesel for 2020 is taken in consideration that, in accordance with the International Agency of Energia (AIE), in only eight countries, will jump of 34,7 million tons in 2010 for 133,8 million in 2020, with an increment next to 300%. The tame nut is a producing oil plant with all the qualities necessary to be transformed into oil diesel. Beyond perennial and of easy culture, it presents good conservation of the harvested seed, being able to become great producer of substance cousin as optional fuel source. For these authors, this is a culture that can be developed in the small properties, with the available familiar man power, being plus a source of income for the country properties of the Northeast Region. The objective of this work is to evidence the capacity of oil production of the nut-bellwether, and the quality of extration with hexano and methanol in 6 distinct times.

Influência do uso e ocupação do solo nos recursos hídricos do Córrego Três Barras, Marinópolis

Land occupation and its use have a remarkable influence on the superficial water flow and the carrying of sediments to the riverbed and may change the quality and availability of water. The current study aimed to check the influence of the land occupation and use on the Tres Barras stream resources, in Marinopolis, SP, Brazil. To check this influence, an analysis of Pearson's correlation between the parameters of quality and availability and use of water and land was developed. The samples covered the period of January, 2006 until December, 2007. It may be concluded that areas occupied by forests and pastures (in less intensity) favoured the availability and quality of water of the watershed. The inhabited areas and those used for agriculture, and the degraded forests in general, reduced the availability and quality of water in the watershed.

Trabalho destruído e funcionalização do lazer: possíveis relações em tempos de alta modernidade.

The possible relationships between leisure and labor and its association with the formation of high modernity as a historic and social phenomenon in a historic - dialectic perspective is discussed in this text. A bibliographic research on public documents such as journals, books, monographs and iconography's materials from classic and contemporary authors was carried out. It was concluded that leisure was equipped during the development of modernity and plays a revitalizing role for the labor force and construction of a discipline that is needed for a flexible and heterogeneous labor nowadays which characterize the contemporary societies.

Resinas para facetas estéticas de próteses fixas. III. Análise conjunta das variáveis alteração dimensional e alteração de peso em função de materiais, condição de armazenamento e tempos.

The authors analysed the simultaneous effects of the dimensional and weight alteration of resins utilized for esthetic facets submitted to warehousing conditions and periods of time. The resins showed different behaviour and a neat correlation between dimensional alteration and weight. The condition of immersion promoted dimensional alteration 50% lower and an alteration of weight three times higher.

COMPARACAO ENTRE MEDICAMENTOS ORAIS ATRAVES DAS TAXAS SERICAS DE GLICOSE, AMILASE, ACIDOS GRAXOS LIVRES E LIPOPROTEINAS DE ALTA DENSIDADE (HDL-COLESTEROL) NOS DIABETICOS DE AMBOS OS SEXOS, DA REGIAO DE ARARAQUARA, NAO-DEPENDENTES DE INSULINA

A study was carried out, on both sexes, to determine the effects of chlorpropamide (DIABINESE) and glibenclamide (DAONIL) on patients with Type II diabetes using as metabolic parameters the following serum: glucose, amilase, high density lipoprotein cholesterol, free fatty acids. The results indicated that both drugs were potentially similar in relation to glycemia, high density lipoprotein cholesterol, and free fatty acids, in both sexes. Chlorpropamide was significantly more effective in reducing amilase activity in male diabetics than glibenclamide. The above mentioned hypoglycemiants did not reduce glycemia to basic levels in either masculine or feminine groups of diabetics.

Dinâmica da ocupação do solo bacia do Rio Itiquira, Mato Grosso, Brasil

The study area corresponds to the basin of the Itiquira river high course, totalling 5,361km2. In this area a study of the environmental dynamics was made, applying SIG techniques and satellite images of the years 1966, 1985 and 1996. In 1966 the areas of natural vegetation (forests and groves) occupied 90.64% of the total of the area, which was diminished to 60.57% in 1985 and to only 36.66% in 1996. In this process, 289,382ha of a total of 485,928ha of natural vegetal covering had been lost. At the same time, the agrarian surfaces (agriculture and pasture) that occupied only 0.52% of the total area in 1966, increased to 34.89% in 1985 and to 59.04% in 1996. In 30 years there was an increase of 313,725ha of cultivated lands, corresponding to about 113 times the land occupation of the year of 1966 (2,798ha). The areas classified as urban show a gradual increase since 1966, from 39ha in 1996 to 58ha in 1985, and to 178ha in 1996. The other classes of soil use and occupation (reforestement areas, uncovered and affected by fire and humid areas) added were smaller than 4,27% in 1996.

Efeito do alumínio no conteúdo de poliaminas livres e atividade da fosfatase ácida durante o crescimento de brotações de Eucalyptus grandis × E. urophylla cultivadas in vitro

This paper is aiming to evaluate the effects of different levels of the aluminum on the growth of the Eucalyptus grandis x E. urophylla shoots cultivated in vitro. Evaluations were carried out on pH and chemicals modifications of the culture medium by Geochem program, polyamines contents (putrescine, espermidine e espermine) and acid phosphatase ativity on the shoots. The trial had a totally randomized design with four treatments and four replicates. The treatments were: 0.0, 6.75,13.50 and 27 mg.L -1 of AlCl 3.6H 2. Evaluations were carried out on the 4th, 8th, 12th, 16th, 20th, 24th and 28th day of culture. The addition of the aluminium, in all concentrations, affected the culture medium ionic equilibrium, the morphology of the shoots, reduced the pH on the medium, induced an increase in polyamines content and higher acid phosphatase activity.