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Search Results: 1 - 10 of 204466 matches for " Roberto Alexandre Vitória de;Carvalho "
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Imageamento da subsuperfície baseado na condutividade: obten??o de CDIs para o Sistema Geotem
Huelsen, M?nica Giannoccaro Von;Moraes, Roberto Alexandre Vitória de;Carvalho, Thiago Silva de;
Revista Brasileira de Geofísica , 2008, DOI: 10.1590/S0102-261X2008000300010
Abstract: the objective of subsurface imaging is to transform responses measured by atdem methods in an image of the electrical conductivity versus depth (cdi) and with this, to get information on target geometry and conductivity (geoelectrical model). this work presents a methodology to get cdis over the measurement profile (2-d) used subsequently to visualize the geoelectrical model in 3-d, which would help to integrate and to understand the local geology. to accomplish this, a layered geoelectrical model is used (1-d) together with the depth attained by the maximum electrical induced current concept. the conductivity and the layer characterization are based on a simplified modeling algorithm (early and late asymptote approximations). resultant software (sandberg, 1986) was adapted to calculate the depth and to processes geotem data.
CDI Versus invers?o: aplica??o a dados reais
Huelsen, M?nica Giannoccaro Von;Moraes, Roberto Alexandre Vitória de;
Revista Brasileira de Geofísica , 2008, DOI: 10.1590/S0102-261X2008000300004
Abstract: the aim of this paper is to carry out a comparison between two types of 2d electromagnetic modeled sections normally used on aem data quantitative interpretation especially on those obtained from atdem measurements (atdem). one is obtained from fast modeling of the secondary magnetic flux decay and is the most common quantitative interpretation tool. the other is of more restrict usage and use 1d inversion techniques. in the first case, the technique transforms the atdem responses on a conductivity depth image (cdi) and a glimpse of the subsurface conductivity distribution can be obtained with a fast processing approach. in the second case, the use of a 1d inversion, based on the nlstci computational algorithm (short for nonlinear least-squares inversion of transient soundings for a central induction loop) allows to get a similar result but now relying on a wave equation development. it is a mathematically and computationally complex, and more time consuming technique. the two approaches were applied to airborne geotemtm system real data, collected on a survey at san pedro valley (southeast arizona) in 1997.the available data from this region were made available by the usgs and were used in this quantitative analysis. as such, 2d sections were obtained, and from these, maps were generated. the results from 2d sections - conductivity spatial distribution obtained from cdis and 1d inversions - were volumetrically interpolated (voxels) allowing a 3d representation of the conductivity spatial distribution for the surveyed area.
Integra??o e análise de dados aerogeofísicos por meio da aplica??o de técnicas de processamento digital de imagens e classifica??o n?o supervisionada: o exemplo do Greenstone Belt Rio das Velhas, quadrilátero ferrífero, MG
Teixeira, Alexandre de Amorim;Silva, Adalene Moreira;Pires, Augusto César Bittencourt;Moraes, Roberto Alexandre Vitória de;Souza Filho, Carlos Roberto de;
Revista Brasileira de Geofísica , 2006, DOI: 10.1590/S0102-261X2006000400009
Abstract: poor outcrop and deep weathering characterize the rio das velhas greenstone belt in the southeastern from brazil. this paper summarizes the use of high-density airborne survey for mineral exploration studies based on interpretation enhancements of magnetic, radiometric and frequency domain electromagnetic data using image-processed methods and an unsupervised classification. the generated products provide new insights and an excellent tool for mapping and trace individual lithological units, improving the information content of the single geophysical channels. the geophysical images were processed using different combinations. the best product was the analytical signal amplitude and inclination integrated by ihs transformation. information extracted from this image maps the geology and lineament patterns at both regional and local scales. the k-means technique using ten classes was also applied to the geophysical data. these results enhance the lithologies mapped by the field geologists at the 1:100.000. also shows important host rocks and different gold mineralized geological domains. such domains host the known gold mineralization, illustrating the utility of these techniques to improve the geological knowledge in the study area.
Efeito da época de semeadura de Brachiaria decumbens e de dessecantes em pré-colheita sobre o rendimento de gr?os do feijoeiro e a biomassa forrageira em cultivo consorciado
Carvalho, Abner José de;Carneiro, José Eustáquio de Souza;Ferreira, Lino Roberto;Cecon, Paulo Roberto;Santos, Márcia Vitória dos;
Ciência e Agrotecnologia , 2011, DOI: 10.1590/S1413-70542011000500005
Abstract: in order to evaluate different sowing dates and the effect of desiccation on brachiaria decumbens intercropped with two beans cultivars (phaseolus vulgaris l.), an experiment was conducted in coimbra, mg in a factorial design involving two bean cultivars (ouro vermelho and vc3), two sowing dates (simultaneous and during bean weeding), three desiccation types (without desiccation, carfentrazone-ethyl and paraquat), plus two additional plantings of monoculture bean and brachiaria in dbc with four replications. the beans were seeded by mechanized planting with 0.50 m spacing between the rows. brachiaria was sown by manual planting between the bean rows. we evaluated the final stand and grain yield of the beans, and the dry biomass of the brachiaria shoots, at 15 and 60 days after the bean harvest. it was concluded that the cultivar ouro vermelho was most suitable for intercropping with b. decumbens in the rainy season. sowing brachiaria after weeding the beans increased the grain yield of the beans, but hindered the production of dry biomass in the brachiaria shoots. pre-harvest desiccation does not influence the grain yield, but when performed with paraquat it again hinders the production of dry biomass in brachiaria shoots.
Identifica??o de linhagens avan?adas de alface quanto à resistência a Meloidogyne javanica
Ferreira, Sindynara;Vieira, Vitória Lara Fran?a;Gomes, Luiz Antonio Augusto;Maluf, Wilson Roberto;Carvalho Filho, José Luiz Sandes de;
Ciência e Agrotecnologia , 2011, DOI: 10.1590/S1413-70542011000200006
Abstract: the objective of the present work was to evaluate the behavior of lettuce lineages as for resistence to nematode from the meloidogyne javanica root-knots, identifying probable existence of homozigote lineages for the characteristics. five f4 and six f5 lineages were used as treatments together with the controls 'grand rapids' (resistent) and 'regina 71' (susceptible), apart from the santa clara tomato plant cultivar. the sowing was done over expanded polystyrene trays with the substrate infested by m. javanica eggs in the proportion of 30 eggs cm-3 of substrat. at 47 days after infestation, each plant was evaluated individually as for the following characteristics: visual level of root-knots, number of eggs, level and factor of reproduction. every lineage was compared to the 'regina 71' and 'grand rapids' for each characteristic, through dunnett (5%) test, obtaining the significance in relation to each control, allowing the classification of each lineage as resistant homozigote, susceptible homozigote or segregated. the results obtained showed that six lineages (afx 018c 002 23 15, afx 018c 002 23 22, afx 018c 005 42 20, afx 018c 005 44 22, afx 018c 005 44 28 and afx 022b 010 31) were considered resistant homozigote for the evaluated characteristics, and maybe being used as new sources of resistance to m. javanica in lettuce breeding program.
Determina?ao de metais classificados como de importancia toxicológica no molusco bivalve Anadara notabilis (R?ding, 1798): Encontrado em Galinhos, Rio grande do norte, Brasil
Urbano de Araújo,Marcos A; Vitória de Moura,Maria F; Borges de Carvalho,Genickson;
Acta toxicol?3gica argentina , 2010,
Abstract: bivalve molluscs are consumed throughout the world, constituting a natural resource with good acceptance by the population. the mollusc anadara notabilis (know as eared ark) was chosen for this study due to its characteristic size, much larger than most common shellfish, and the lack of toxicological information found in literature for this class of mollusks when considering metal ions toxicity. metal ions were measured by inductively coupled plasma optical emission spectroscopy (icp-oes), method described by u.s. epa 6010c. results showed that several toxic metals were present in shellfish, however only chrome was measured in levels higher than those allowed by brazilian legislation. among those classified as toxic metals, copper showed a value of 5.7 mg / kg, nickel of 4.23 mg / kg and chromium of 1.7 mg / kg, when considering whole shellfish samples. as molluscs are able to accumulate metals in their body, for its consumption care should be taken regarding the areas in close proximity to their collection or cultivation, including prevention of factors that influence contamination.
Determina ao de metais classificados como de importancia toxicológica no molusco bivalve Anadara notabilis (R ding, 1798): Encontrado em Galinhos, Rio grande do norte, Brasil Determination of metals of toxicological importance in the bivalve Anadara notabilis (R ding, 1798) of Galinhos, coast of Rio grande do norte, Brazil
Marcos A Urbano de Araújo,Maria F Vitória de Moura,Genickson Borges de Carvalho
Acta Toxicológica Argentina , 2010,
Abstract: Os moluscos bivalves s o consumidos por todo o mundo, constituindo-se em um recurso natural de boa aceita o pela popula o. Foi escolhido o molusco Anadara notabilis (conhecido como Xibiu ou Búzio) para este trabalho pelo seu tamanho característico, bem maior que os mariscos mais comuns, e também por n o ter sido encontrado na literatura nenhuma informa o toxicológica sobre esta classe de moluscos. Todos os íons metálicos foram determinados por espectroscopia de emiss o ótica com plasma indutivamente acoplado (ICP-OES) descrito pela metodologia U.S. EPA 6010C. Os resultados mostraram que estiveram presentes no molusco vários metais de caráter tóxico, porém apenas o cromo obteve valor acima do permitido pela legisla o brasileira. Dentre os metais classificados como tóxicos o cobre que apresentou valor de 5,7 mg/Kg, o níquel que apresentou teor de 4,23 mg/Kg e o cromo, o único acima dos valores permitidos pela legisla o brasileira, com teor de 1,7 mg/Kg, sempre considerando a amostra in natura. Como os moluscos têm a propriedade de acumular metais em seu organismo, para o consumo desse tipo de alimento, deve-se tomar cuidado com as áreas próximas de sua coleta ou se cultivado, é necessário prevenir fatores que influenciem em sua contamina o. Bivalve molluscs are consumed throughout the world, constituting a natural resource with good acceptance by the population. The mollusc Anadara notabilis (know as eared ark) was chosen for this study due to its characteristic size, much larger than most common shellfish, and the lack of toxicological information found in literature for this class of mollusks when considering metal ions toxicity. Metal ions were measured by inductively coupled plasma optical emission spectroscopy (ICP-OES), method described by U.S. EPA 6010C. Results showed that several toxic metals were present in shellfish, however only chrome was measured in levels higher than those allowed by Brazilian legislation. Among those classified as toxic metals, copper showed a value of 5.7 mg / kg, nickel of 4.23 mg / kg and chromium of 1.7 mg / kg, when considering whole shellfish samples. As molluscs are able to accumulate metals in their body, for its consumption care should be taken regarding the areas in close proximity to their collection or cultivation, including prevention of factors that influence contamination.
Sor??o do inseticida tiametoxam em latossolos sob efeito de fosfato e vinha?a
Oliveira, Vitória de Souza de;Lima, José Maria de;Carvalho, Renato Fráguas de;Rigitano, Renê Luís Oliveira;
Química Nova , 2009, DOI: 10.1590/S0100-40422009000600013
Abstract: little information is available on the behavior of thiamethoxam in soils, whereas many studies show the effect of phosphate and vinasse in soils in brazil. this study evaluated the sorption, desorption and retention of thiamethoxam in vinasse- and phosphate-amended samples of a dystrophic red-yellow latosol (lvad) and a distroferric red latosol (lvdf). the lvad presented higher sorption of thiamethoxam. phosphate did not affect the sorption or retention and vinasse increased the interaction of the compound with the soil particles, reducing desorption to the soil solution.
Representa es sociais do corpo: um estudo sobre as constru es simbólicas em adolescentes Representaciones sociales del cuerpo: un estudio sobre las construcciones simbólicas en adolescentes Social representations of the body: a study on the symbolic constructions in teenagers
Leonéa Vitória Santiago,Noêmia Belém de Oliveira,Alexandre Magno Cancio Bulh?es,Antonio Carlos Sim?es
Revista Brasileira de Educa??o Física e Esporte , 2012, DOI: 10.1590/s1807-55092012000400008
Abstract: Este estudo, de natureza exploratória descritiva, buscou compreender as representa es do corpo em adolescentes, do nono ano de escolaridade em Portugal em ambos os gêneros. Entrevistas foram gravadas, recorrendo-se à técnica de análise de conteúdo. Utilizou-se o programa informático NVivo para tratar os dados. Como resultado, verificamos que a heran a cartesiana, concebe o corpo como extens o da mente. A representa o feminina valoriza o estético, enquanto o corpo é instrumento e a saúde como valor, é representado pelo gênero masculino como forma de se estar no mundo. No lazer surge o movimento pelo movimento e de novo surge o convívio como valor. A comunica o social influência o sentido crítico de cada um. A anorexia nervosa é representada por quest es socioculturais e os alunos n o reconhecem a aluna diagnosticada com a patologia, no contexto escolar. Este estudio, de naturaleza exploratoria descriptiva, buscó comprender las representaciones del cuerpo en adolescentes, del noveno a o de escolaridad en Portugal, en ambos géneros. Entrevistas fueron grabadas, recurriéndose a la técnica de análisis de contenido. Se utilizó el programa informático NVivo para tratar los datos. Como resultado, verificamos que la herencia cartesiana, concibe el cuerpo como extensión de la mente. La representación femenina valoriza lo estético, en cuanto el cuerpo es instrumento y la salud, como valor, es representado por el género masculino como forma de estar en el mundo. En el ocio, surge el movimiento por el movimiento y de nuevo surge la convivencia como valor. La comunicación social influencia el sentido crítico de cada uno. La anorexia nerviosa es representada por cuestiones socioculturales y los alumnos no reconocen la alumna diagnosticada con la patología, en el contexto escolar. The current descriptive exploratory nature study aimed at understanding the representations of the body in teenagers of both sexes from the ninth school year grade in Portugal. Interviews were recorded, thus using the content analysis technique. The NVivo informatics program was used to deal with the data. The results, show that the Cartesian inheritance conceives the body as an extension of the mind. The female representation highlights aesthetics, while the body is a tool and health as value is represented by the male gender as a means of being in the world. The movement by the movement arises within the leisure and again the living appears as a value. The social communication influences each one's critical sense. The nervous anorexia is represented by social-cultural matters and the stu
Assessment of in vitro methodologies to determine topical and transdermal delivery of the flavonoid quercetin
Vicentini, Fabiana Testa Moura de Carvalho;Georgetti, Sandra Regina;Bentley, Maria Vitória Lopes Badra;Fonseca, Maria José Vieira;
Brazilian Journal of Pharmaceutical Sciences , 2009, DOI: 10.1590/S1984-82502009000200022
Abstract: to be effective against the oxidative damages induced by uvb irradiation in the skin, the drug needs to release from the formulation in which it was incorporated and reach the skin layers where the ros are generated. thus, it is very important the development of a robust and sensitive methodology to extract and quantify in different skin layers the antioxidant agent delivered from topical formulations. therefore, in the present work suitable methods to extract and quantify quercetin in skin samples and receptor phase after in vitro penetration studies were developed. the results demonstrated that the recovery from two different layers of skin, the sc and [e+d], using two different methods of quantification (dpph? assay and hplc, respectively), was 93.8 % when the quercetin spiked dose was 50 μg/ml, 100.4 % when it was 100 μg/ml and 89.9 % for 250 μg/ml and the average recovery of the quercetin extraction from receptor phase when dichloromethane was used as extractor solvent was 96%. these results demonstrate that the described methods have a potential application to in vitro skin penetration studies of quercetin, since it showed to be accurate and sensitive.
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