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Search Results: 1 - 10 of 218893 matches for " Vanderley;Lédo "
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Repetibilidade de características agron?micas e número de cortes necessários para sele??o de Urochloa ruziziensis
Souza Sobrinho, Fausto;Borges, Vanderley;Lédo, Francisco José da Silva;Kopp, Maurício Marini;
Pesquisa Agropecuária Brasileira , 2010, DOI: 10.1590/S0100-204X2010000600007
Abstract: the objective of this work was to estimate the repeatability of agronomic traits and to determine the appropriate number of cuts for selectig urochloa ruziziensis. one hundred and eighteen progenies of half-sib u. ruziziensis and four checks, the cultivars basilisk (u. decumbens), marandu (u. brizantha), comum (u. ruziziensis) and one access urochloa sp. were evaluated. a randomized complete block with two replications and plots in a 3.0-m line with 1.0x0.5-m spacing was used. seven cuts were made at intervals of 60 and 90 days in wet and dry seasons, respectively. the evaluated characteristics were: plant height, dry matter weight (dm), fresh matter weight (fm) and percentage of dry matter (pdm). the repeatability was estimated by analysis of variance, principal components of the covariance matrix and of the correlation matrix, and structural analysis using the correlation matrix. repeatability estimates varied from 0.31-0.38 for plant height, 0.31-0.43 for fm, 0.16-0.50 for pdm and 0.23-0.43 for dm, with coefficients of determination between 57-87%. the number of cuts necessary to assess the actual value of the characteristics ranged between 7-8 cuts for fm and plant height, and 10-14 for dm and pdm, with coefficients of determination greater than 80%.
Associa??o entre caracteres e análise de trilha na sele??o de progênies de meios-irm?os de Brachiaria ruziziensis
Borges, Vanderley;Sobrinho, Fausto Souza;Lédo, Francisco José da Silva;Kopp, Maurício Marini;
Revista Ceres , 2011, DOI: 10.1590/S0034-737X2011000600013
Abstract: high association between fresh and dry mass weight can facilitate early selection of superior genotypes of b. ruziziensis r. germ. & c.m. evrard. the aim of this study was to verify the associations between traits in the selection of b. ruziziensis genotypes. the experiment was arranged in a complete randomized block design with two replications. the traits evaluated were height and vigor of plants; weight of fresh mass and percentage of dry matter of the whole plant, stem and leaf; dry mass weight of total herbage, stem, and leaf and the ratio between productivity of leaf and stem. estimation of simple correlations and path analysis were performed considering the dry mass weight as the main variable. the correlations were mostly low, but significant higher correlations were observed between fresh mass weight and dry mass weight, dry weight of the stem and dry weight of leaves. the path coefficients showed that the direct effects of different explanatory variables on the dry mass weight were mostly low. more significant direct effects were obtained with fresh mass weight, stem dry weight and leaf dry weight, indicating that the fresh mass weight allows for the indirect selection for dry mass weight.
Acidentes com material biológico em hospital da Rede de Preven??o de Acidentes do Trabalho - REPAT
Marziale, Maria Helena Palucci;Silva, Everaldo Jose da;Haas, Vanderley José;Robazzi, Maria Lúcia do C. C.;
Revista Brasileira de Saúde Ocupacional , 2007, DOI: 10.1590/S0303-76572007000100010
Abstract: this transversal study is aimed at diagnosing work accidents involving exposure to biological material occurred at the brasília university hospital, as well as at analyzing institutional preventive actions. the repat - work accident prevention network - electronic form was used for data collection. data were collected during 2003 and 2004 and the statistical analysis was performed through computation of frequencies. among the 2.000 to 2.011 workers in action at that time, 107 accidents were evidenced. the highest amount of them occurred in the morning, among women, and involved perforating lesion in hands, caused by needles and catheters in the medical clinic and emergency units. due to the characteristics of these accidents, the preventive actions, which included training, visits to work places and individual orientation, need to be revised and expanded.
Development of a methodology for microstructural description
Vasconcelos, Vanderley de;Vasconcelos, Wander L.;
Materials Research , 1999, DOI: 10.1590/S1516-14391999000300003
Abstract: a systematic methodology for microstructural description can help the task of obtaining the processing x microstructure x properties x performance relationships. there are, however, some difficulties in performing this task, which are related mainly to the following three factors: the complexity of the interactions between microstructural features; difficulties in evaluating geometric parameters of microstructural features; and difficulties in relating these geometric parameters to process variables. to solve some of these problems, it is proposed a methodology that embodies the following features: takes into account the different possible types of approaches for the microstructural description problem; includes concepts and tools of total quality management; is supported on techniques of system analysis; and makes use of computer modeling and simulation and statistical design of experiments tools. the methodology was applied on evaluating some topological parameters during sintering process and its results were compared with available experimental data.
Development of a methodology for microstructural description
Vasconcelos Vanderley de,Vasconcelos Wander L.
Materials Research , 1999,
Abstract: A systematic methodology for microstructural description can help the task of obtaining the processing x microstructure x properties x performance relationships. There are, however, some difficulties in performing this task, which are related mainly to the following three factors: the complexity of the interactions between microstructural features; difficulties in evaluating geometric parameters of microstructural features; and difficulties in relating these geometric parameters to process variables. To solve some of these problems, it is proposed a methodology that embodies the following features: takes into account the different possible types of approaches for the microstructural description problem; includes concepts and tools of Total Quality Management; is supported on techniques of system analysis; and makes use of computer modeling and simulation and statistical design of experiments tools. The methodology was applied on evaluating some topological parameters during sintering process and its results were compared with available experimental data.
Estudo de orienta??o de partículas em aglomerados gerados por modelos bidimensionais
Vasconcelos, Vanderley de;Pinto, Lúcio Carlos Martins;Vasconcelos, Wander L.;
Ceramica , 1997, DOI: 10.1590/S0366-69131997000400004
Abstract: in the formation of agglomerates, small particles tend to aggregate in order to reduce the total free energy of the system. even when the individual particles can be treated as spheres of uniform size, depending on the process and involved forces the agglomerates can show some kind of particle orientation. this paper uses digital image processing techniques for obtaining particle orientation distribution of two-dimensional simulated agglomerates. these simulations were carried out using a computer graphics environment with solid modeling extension. the use of two-dimensional models instead of three-dimensional ones is an alternative to reduce the long computacional times involved in the analysis of complex real systems. despite being simple, in principle, very important information can be obtained from two-dimensional systems and directly applied to real three-dimensional cases.
Estudo de orienta o de partículas em aglomerados gerados por modelos bidimensionais
Vasconcelos Vanderley de,Pinto Lúcio Carlos Martins,Vasconcelos Wander L.
Ceramica , 1997,
Abstract: Na forma o de aglomerados, partículas pequenas tendem a se agregar, reduzindo a energia livre total do sistema. Mesmo quando as partículas primárias têm forma esférica e tamanhos uniformes, dependendo do tipo do processamento e das for as envolvidas, os aglomerados podem apresentar orienta es preferenciais de partículas. Este trabalho utiliza técnica de processamento digital de imagens para a obten o das distribui es de orienta o de partículas em aglomerados bidimensionais simulados. As simula es foram realizadas em um ambiente de computa o gráfica com recursos de modelagem de sólidos. A escolha de modelos bidimensionais para representar casos tridimensionais é um artifício muito empregado para reduzir os altos tempos de processamento computacional envolvidos no estudo de processos complexos.Apesar de simples, em príncipio, muitas conclus es importante podem ser extraídas dos modelos bidimensionais e muitos de seus resultados aplicados diretamente aos casos reais.
Valida??o Experimental de Modelos de Leitos Adsorvedores com Zeólitas 5A
Vasconcelos, Vanderley de;Schvartzman, M?nica;Reis da Costa Campos, Wagner;Vasconcelos, Wander L.;
Ceramica , 1997, DOI: 10.1590/S0366-69131997000300005
Abstract: the characterization of porous bed is of crucial importance in many scientific and technological areas related to materials and chemical processes. mass and heat transfer in a porous media depend on metric, topological and topographical properties. because the difficulties of experimental access to topological and topographical properties sometimes it is practical the use of computer simulation techniques to evaluate those parameters. this paper presents the simulation results of adsorbing beds using commercial 5a zeolites. the sphere packing models applied to adsorbing beds are adjusted through the comparison of metric properties, such as volumetric fraction and specific area of pores, evaluated for simulated and real beds. starting from adjusted models, the topological and topographical properties, like radial distribution of porosity and pore connectivity are estimated and compared with those parameters obtained for real beds through the use of indirect methods.
Valida o Experimental de Modelos de Leitos Adsorvedores com Zeólitas 5A
Vasconcelos Vanderley de,Schvartzman M?nica,Reis da Costa Campos Wagner,Vasconcelos Wander L.
Ceramica , 1997,
Abstract: A caracteriza o de meios porosos é muito importante em áreas científicas e tecnológicas envolvendo materiais e processos químicos. Processos de transferência de calor e massa em meios porosos dependem, além de suas propriedades métricas, das propriedades topológicas e topográficas. No entanto, essas propriedades s o de difícil acesso experimental, raz o pela qual torna-se necessária, algumas vezes, a utiliza o de técnicas de simula o para auxiliar nas suas determina es. Este trabalho apresenta os resultados de simula o de leitos adsorvedores utilizando zeólitas 5A comerciais. Os modelos de compacta o de partículas esféricas dos leitos adsorvedores s o ajustados para que suas propriedades métricas, como fra o volumétrica e área superficial de poros, se aproximem daquelas determinadas para os leitos reais. A partir dos modelos ajustados, os parametros topográficos e topológicos, como a distribui o radial da porosidade e a conectividade de poros, s o estimados e comparados com valores obtidos para os leitos reais através de métodos indiretos.
Dynamics of Health Expenditures in OECD Countries: Panel ARDL Approach  [PDF]
?brahim Do?an, Nadide Sevil Tülüce, Aydan Do?an
Theoretical Economics Letters (TEL) , 2014, DOI: 10.4236/tel.2014.48082
Abstract: This study used a panel data set, which is including 15 OECD countries that have high income per capita for the time period of 1995-2011. Following causality and autoregressive distributed lag (ARDL), paper yields: 1) respectively the largest and the smallest impacts on health expenditures are caused by public spending and the influences of Age Dependency Ratio Young (ADRY); 2) income and Age Dependency Ratio Old (ADRO) on health expenditures are positive; 3) another striking inference is that while young working population rate is increasing, health expenditure is decreasing.
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