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Search Results: 1 - 10 of 20828 matches for " Ferreira Nildemar Aparecido Messias "
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Work softening of drawn low carbon steel bars
Aguilar Maria Teresa Paulino,Corrêa Elaine Carballo Siqueira,Monteiro Waldemar Alfredo,Ferreira Nildemar Aparecido Messias
Materials Research , 2001,
Abstract: The work hardening of metals subjected to complex processing paths is different from that in monotonic deformation. Changes in the deformation mode can promote transients in the strain-hardening rate, leading to anomalous softening or hardening of the material. This paper investigates the influence of strain path changes on the tensile behavior of drawn 0.12% steel rods. Annealed or predrawn specimens were submitted to cyclic twisting and then tested in tension. The results show that the cyclic deformation causes changes in the mechanical behavior of the metal, and the effect will depend on the previous "history" of the material. Cyclic twisting causes hardening in annealed samples, but leads to softening of the drawn bars. These phenomena are in line with the corresponding substructural aspects.
Work softening of drawn low carbon steel bars
Aguilar, Maria Teresa Paulino;Corrêa, Elaine Carballo Siqueira;Monteiro, Waldemar Alfredo;Ferreira, Nildemar Aparecido Messias;Cetlin, Paulo Roberto;
Materials Research , 2001, DOI: 10.1590/S1516-14392001000200008
Abstract: the work hardening of metals subjected to complex processing paths is different from that in monotonic deformation. changes in the deformation mode can promote transients in the strain-hardening rate, leading to anomalous softening or hardening of the material. this paper investigates the influence of strain path changes on the tensile behavior of drawn 0.12% steel rods. annealed or predrawn specimens were submitted to cyclic twisting and then tested in tension. the results show that the cyclic deformation causes changes in the mechanical behavior of the metal, and the effect will depend on the previous "history" of the material. cyclic twisting causes hardening in annealed samples, but leads to softening of the drawn bars. these phenomena are in line with the corresponding substructural aspects.
Estima o da equa o demanda de importa o de bens intermediário para o Brasil no período de 1995 a 2008: um modelo de corre o de erro
Ad?o Aparecido Ferreira RODRIGUES
Revista da Universidade Vale do Rio Verde , 2012,
Abstract: The aim of this paper is to estimate the demand for intermediate goods imports, based on theestimation method proposed by Engle and Granger (1987). During the first quarter of 1995 to second quarter2008. The results show that the series are all integrated of the same order (I (1)), cointegram and then appliedthe mechanism of error correction, we obtain elasticity’s acceptable, but with differences in relation toprevious work. That may be due to the study period, have passed through intense exogenous changes.
Microscopia de for?a at?mica aplicada em imunoensaios
Ferreira, Antonio Aparecido Pupim;Yamanaka, Hideko;
Química Nova , 2006, DOI: 10.1590/S0100-40422006000100024
Abstract: affinity reactions have been used for specific detection of their complementary partners and an enormous variety of enzyme-linked immunosorbent assay (elisa) formats are used in research and in routine serological tests. with the advent of the atomic force microscopy (afm) technique, the immune reactions have been monitored by these devices. in the present article we focus on applications of afm to immunoassays. after introducing the basic concepts of afm, a brief discussion on the monitoring of the interactions between antigens and antibodies through both topographic image and biosensor systems is presented.
Controle de tens?o no fluxo de potência continuado: modelagens e efeitos na estabilidade de tens?o
Ferreira, Carlos Aparecido;Costa, Vander Menengoy da;
Sba: Controle & Automa??o Sociedade Brasileira de Automatica , 2004, DOI: 10.1590/S0103-17592004000400009
Abstract: this paper proposes to model both the automatic tap control and the secondary voltage control in the continuation power flow problem, as well as, to evaluate the effects in the voltage stability due to the insertion of these control strategies. maximum and minimum operative limits of each control device are taken into account. modal analysis results are utilized in order to identify the system critical buses.
Microscopia de for a at mica aplicada em imunoensaios
Ferreira Antonio Aparecido Pupim,Yamanaka Hideko
Química Nova , 2006,
Abstract: Affinity reactions have been used for specific detection of their complementary partners and an enormous variety of enzyme-linked immunosorbent assay (ELISA) formats are used in research and in routine serological tests. With the advent of the atomic force microscopy (AFM) technique, the immune reactions have been monitored by these devices. In the present article we focus on applications of AFM to immunoassays. After introducing the basic concepts of AFM, a brief discussion on the monitoring of the interactions between antigens and antibodies through both topographic image and biosensor systems is presented.
The influence of a Coulomb gap in the whole variable range hopping regime
J. F. Sampaio,A. Aparecido-Ferreira
Physics , 2010,
Abstract: The temperature dependence of the electrical resistivity in insulator systems with a Coulomb gap in the density of states is expressed by a very simple function which coincides with the Efros-Shklovskii T^(-1/2)result, at temperatures lower than some value Tlim. Above this limit it consists of the product of the Mott T^(-1/4) exponential with another one like a simply thermally activation process. It fits well several experimental results reported as having a crossover between the Efros-Shklovskii and Mott regimes, and allows the determination of the gap parameters even in experiments that do not reach the T^(-1/2) regime. Also it accounts for some experimental results reported to follow a T^(-n) behavior with 0.5
Compara??o de métodos de estima??o da estabilidade fenotípica em animais da ra?a Holandesa
Rezende, Douglas Messias Lamounier Camargos;Ferreira, Daniel Furtado;
Pesquisa Agropecuária Brasileira , 2001, DOI: 10.1590/S0100-204X2001000100022
Abstract: this work aimed to compare conventional regression methods, deviation from the maximum response, reliability index and ammi (additive multiplicative models interaction) in order to estimate stability parameters for milk production in holstein cows. the results obtained were compared with the results from toler's method. in total 22,560 lactation data were used, up to 305 days obtained through the holstein cattle breeders association of minas gerais state (hcbamg), brazil, from 1989 to 1996. animals were separated into six genetic groups (31/32, gc1, gc2, gc3, gc4 and po) and evaluated in 14 environments. the conventional regression method presented classification patterns for environmental variations different from the classification given by toler's method. the latter was considered more appropriate. the ammi method was not considered to be efficient for the study of phenotypic stability of the holstein breed groups. the methods of deviation from the maximum response and reliability index presented similar results and complemented information supplied by the method of toler. the genetic groups gc2 (2nd controlled generation) and po (pure from origin) presented the largest average productions and alternated with each other as the most stable for the different methods. the genetic groups 31/32 and gc1 presented the lowest average productions and were consistently the most unstable for all the methods studied.
Compara o de métodos de estima o da estabilidade fenotípica em animais da ra a Holandesa
Rezende Douglas Messias Lamounier Camargos,Ferreira Daniel Furtado
Pesquisa Agropecuária Brasileira , 2001,
Abstract: Este trabalho teve por objetivo comparar os métodos de regress o convencional, desvio do desempenho máximo, índice de risco e o modelo AMMI (Additive Multiplicative Models Interaction) na estima o de parametros de estabilidade de leite de vaca da ra a Holandesa. Os resultados obtidos foram comparados com os do método de Toler. Foram utilizados registros de 22.560 lacta es em até 305 dias, obtidos na Associa o de Criadores de Gado Holandês de Minas Gerais (ACGHMG), entre os anos de 1989 e 1996. Os animais foram separados em seis grupos genéticos e submetidos a 14 ambientes. Os métodos de regress o convencionais apresentaram classifica es, com rela o às varia es ambientais, muito diferentes da classifica o do método de Toler; este último foi considerado mais adequado. O método AMMI n o foi eficiente para estudar a estabilidade fenotípica dos grupamentos genéticos da ra a Holandesa. Os métodos do desvio do desempenho máximo e do índice de risco apresentaram resultados semelhantes entre si e complementaram as informa es fornecidas pelo método de Toler. Os grupamentos GC2 (segunda gera o controlada) e PO (puro de origem) foram os que apresentaram as maiores produtividades médias, e se alternaram entre si como os mais estáveis nos diferentes métodos. Os grupamentos 31/32 e GC1 foram os de pior desempenho médio, e est o sempre entre os mais instáveis em todos os métodos.
Spontaneous Mammary Carcinomas in Female Dogs: Association between Immunohistochemical Degrees of Neoplasia Aggressiveness and Residual Pyrethroids  [PDF]
Marcia Moleta Colodel, Isabelle Ferreira, Vera Maria Villamil Martins, Alaor Aparecido Almeida, Maria Denise Lopes, Noeme Sousa Rocha
Open Journal of Veterinary Medicine (OJVM) , 2012, DOI: 10.4236/ojvm.2012.24033
Abstract: Of the tumors diagnosed in the female dogs have the highest mammary neoplasias incidence. These neoplasias can be influenced by environmental contaminants. Despite evidence of pyrethroid toxicity, carcinogenic potential has not yet been sufficiently elucidated, there is a need to investigate their involvement in mammary tumor. In previous studies, pyrethroid residues were detected in female dogs with mammary neoplasia, however was not investigate the influence of this insecticide in the genesis and aggressiveness of mammary cancer. This study aimed to investigate possible relations between pyrethroid residues and aggressiveness of mammary carcinoma in female dogs. Fifty selected female dogs were divided into five groups of 10 animals each: the Control group, female dogs without mammary neoplasia; the groups Luminal A, Luminal B, HER-2 Superexpression and Basal were constituted by female dogs that presented inguinal mammary carcinoma classified immunohistochemically. The aggressiveness of carcinomas was evaluated by immunohistochemistry (HER-2, p63, estrogen receptor). Residual concentrations of the pyrethroids from the mammary gland and fat tissue adjacent to it were determined by HPLC. Data were analyzed by Chi-Square test. Of the all animals, six presented residues of pyrethroids in mammary samples and 10 presented it in fat tissue samples. There was no statistical evidence that pyrethroids are involved in mammary carcinoma aggressiveness in female dogs.
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