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Search Results: 1 - 10 of 563979 matches for " L.V.R.;Fávaro "
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Identifica??o genética de modelos por pólos e zeros baseada no compromisso entre os erros de polariza??o e variancia
Arruda, L.V.R.;Fávaro, Sílvio;Neves-Jr., F.;
Sba: Controle & Automa??o Sociedade Brasileira de Automatica , 2003, DOI: 10.1590/S0103-17592003000200001
Abstract: this work proposes a genetic algorithm (ga) to solve process estimation problems when the real process presents high orders polynomials (complexity model) or non-linearities, non-minimum phase behavior, etc. the algorithm finds the best linear model in the pole and zero form to represent the real plant using its input and output signals. a new chromosome representation was introduced and a new ''fitness'' function based on the tradeoff bias x variance was developed. to validate this genetic estimator, simulations studies were done and the ga performance was compared with one obtained by use of the traditional least square estimation method.
Identifica o genética de modelos por pólos e zeros baseada no compromisso entre os erros de polariza o e variancia
Arruda L.V.R.,Fávaro Sílvio,Neves-Jr. F.
Sba: Controle & Automa??o Sociedade Brasileira de Automatica , 2003,
Abstract: Este trabalho prop em um algoritmo genético aplicado ao problema de identifica o de plantas n o-lineares, de fase n o-mínima ou plantas lineares de ordem superior. O algoritmo proposto tem como objetivo encontrar um modelo linear na forma de pólos e zeros e de ordem reduzida, que melhor represente a planta real, a partir dos sinais de entrada e saída. Uma proposta inovadora para a representa o dos indivíduos e fun o de ''fitness'' foi desenvolvida neste trabalho. Esta fun o de fitness representa o compromisso entre os erros de polariza o e variancia do modelo estimado. Já a representa o proposta divide o espa o de busca em dois subespa os: um destinado à busca de pólos e zeros de natureza real e outro com a finalidade de se encontrar os pólos e zeros complexos. Resultados de simula o s o utilizados para ilustrar o desempenho do estimador genético desenvolvido.
Comparison of two different synthesis methods of perovskites, SrCo0.5FeO3 type, aiming at evaluating their use as membranes for partial oxidation of methane
Noronha F.B.,Mattos L.V.,Souza H.P. de,Morelli M.R.
Materials Research , 2004,
Abstract: In this work two different synthesis methods of perovskites, SrCo0.5FeO3, were compared: combustion synthesis and oxides mixture aiming at evaluating their use as membranes for partial oxidation of methane. The combustion synthesis method explores an exothermic, generally very fast and self-sustaining chemical reaction between the desired metal salts and a suitable organic fuel, which is ignited at a temperature much lower than the actual phase formation temperature. The oxides mixture are based on a physical mixture of the powder oxides followed by calcination to obtain the desired phase. In order to obtain the membranes, we studied the conformation of bodies and the temperatures of sintering in the two powders synthesized. The powders were analyzed by density and grain size distribution and characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). After conformation, in cylindrical form, the green bodies were analyzed by density. After sintering at 1150 °C, the membranes were analyzed by density and they were characterized by XRD and SEM. The powder obtained by combustion synthesis shows lower density and fine grains than the other obtained by oxides mixture. The membranes obtained present very different morphology depending on the precursor powder synthesis. The sintered membranes obtained by combustion method also present a very uniform morphology without segregation.
Comparison of two different synthesis methods of perovskites, SrCo0.5FeO3 type, aiming at evaluating their use as membranes for partial oxidation of methane
Noronha, F.B.;Mattos, L.V.;Souza, H.P. de;Morelli, M.R.;Passos, F.B.;Greca, Maria Concei??o;
Materials Research , 2004, DOI: 10.1590/S1516-14392004000200016
Abstract: in this work two different synthesis methods of perovskites, srco0.5feo3, were compared: combustion synthesis and oxides mixture aiming at evaluating their use as membranes for partial oxidation of methane. the combustion synthesis method explores an exothermic, generally very fast and self-sustaining chemical reaction between the desired metal salts and a suitable organic fuel, which is ignited at a temperature much lower than the actual phase formation temperature. the oxides mixture are based on a physical mixture of the powder oxides followed by calcination to obtain the desired phase. in order to obtain the membranes, we studied the conformation of bodies and the temperatures of sintering in the two powders synthesized. the powders were analyzed by density and grain size distribution and characterized by x-ray diffraction (xrd) and scanning electron microscopy (sem). after conformation, in cylindrical form, the green bodies were analyzed by density. after sintering at 1150 °c, the membranes were analyzed by density and they were characterized by xrd and sem. the powder obtained by combustion synthesis shows lower density and fine grains than the other obtained by oxides mixture. the membranes obtained present very different morphology depending on the precursor powder synthesis. the sintered membranes obtained by combustion method also present a very uniform morphology without segregation.
Similaridade genética entre acessos de Bidens pilosa resistentes aos herbicidas inibidores da ALS
Vidal, R.A.;Lamego, F.P.;Resende, L.V.;Da-Silva, P.R.;Delatorre, C.A.;Trezzi, M.M.;
Planta Daninha , 2005, DOI: 10.1590/S0100-83582005000300020
Abstract: acetolactate synthase (als)-inhibiting herbicides have been widely used to control the weed hairy beggarticks (bidens pilosa). the selection pressure caused by intensive herbicide use has selected hairy beggarticks resistant biotypes. the objectives of this work were to evaluate the degree of genetic similarity among hairy beggarticks accesses (bidens pilosa) resistant to als-inhibiting herbicides, and to evaluate the relation between genetic similarity and geographic distance. seeds of two groups of hairy beggarticks accesses resistant to als-inhibitors were sampled from a farm at pato branco, paraná, and seedlings were grown in the greenhouse at the universidade federal do rio grande do sul (ufrgs), porto alegre, rs, in ocober/2004. the use of rapd (random amplified polymorphic dna) molecular markers allowed evaluating the genetic similarity among hairy beggarticks accesses. in the analysis of both access groups, out of twenty primers assessed, only seventeen displayed polymorphism and amplified a total of 94 bands. there is low genetic similarity (38%) among hairy beggarticks accesses resistant to als inhibitors from the same farm. there is no relationship between genetic distance and geographic distance in the evaluated accesses.
Serotyping and evaluation of the virulence in mice of Streptococcus suis strains isolated from diseased pigs
Costa, Adrienny T. R.;Lobato, Francisco C.F.;Abreu, Vera L.V.;Assis, Ronnie A.;Reis, Ronaldo;Uzal, Francisco A.;
Revista do Instituto de Medicina Tropical de S?o Paulo , 2005, DOI: 10.1590/S0036-46652005000200012
Abstract: a total of 110 strains of streptococcus suis, isolated from diseased pigs in brazil were serotyped and analyzed for virulence. serotyping of the strains resulted in the following classification: 42 strains of serotype 2 (38.2%), 10 strains of serotype 14 (9.1%), seven strains of serotype 9 (6.4%), three strains each of serotype 7 and 11 (2.7%), two strains each of serotype 1 and 8 (1.8%) and one strain each of serotypes ?, 3, 5, 6 and 10 (0.9%). cross reactions among serotypes 1, 14 and 7 were observed in 21 strains (19.1%). only 41.9% of the strains were lethal for mice using the pathogenicity test.
Implanta??o de um programa de avalia??o terminal do desempenho dos graduandos para estimar a eficácia do currículo na Faculdade de Medicina de Ribeir?o Preto
Troncon, L.E. de A.;Figueiredo, J.F. de C.;Rodrigues, M. de L.V.;Peres, L.C.;Cianflone, A.R.L.;Picinato, C.E.;Colares, M. de F. A.;
Revista da Associa??o Médica Brasileira , 1999, DOI: 10.1590/S0104-42301999000300005
Abstract: purpose. to describe the main steps in the implementation of such assessment, as well as to present the measures taken in order to overcome the difficulties that have been found. methods. the proposed two-step assessment consists of a test of cognitive aspects based on multiple choice questions (mcq) and practical exams of clinical skills in each of 5 terminal areas. students enrolled as volunteer for either step or both. the examinations were developed and carried out by faculty members nominated by the involved departments under the supervision of an institutional work group. the rates of student enrollment for the summative assessment has been recorded and the responses of both students and faculty members were evaluated by means of specific questionnaires. results. in the first two years, adhesion of students to the mcq test was consistently high, but volunteering to the practical exams was persistently low. moreover, there was a sharp decrease in faculty involvement, from the first to the second year. to overcome these difficulties, a number of measures were implemented aiming at increasing student adhesion and faculty involvement, as well as to improve assessment methods. as a consequence, a remarkable increase in both student adhesion and faculty involvement was recorded. conclusion. the measures taken resulted in sharp increases in both acceptance of the proposed assessment and the quality of the examination methods, which have allowed a more reliable characterization of the strenghts and weaknesses of the local curriculum.
A retrospective comparison of cyclophosphamide plus antithymocyte globulin with cyclophosphamide plus busulfan as the conditioning regimen for severe aplastic anemia
Ommati, L.V.M.;Rodrigues, C.A.;Silva, A.R.;Silva, L.P.;Chaufaille, M.L.L.F.;Oliveira, J.S.R.;
Brazilian Journal of Medical and Biological Research , 2009, DOI: 10.1590/S0100-879X2009000300005
Abstract: allogeneic hematopoietic stem cell transplantation (ahsct) is the treatment of choice for young patients with severe aplastic anemia (saa). the association of antithymocyte globulin (atg) and cyclophosphamide (cy) is the most frequently used conditioning regimen for this disease. we performed this retrospective study in order to compare the outcomes of hla-matched sibling donor ahsct in 41 patients with saa receiving cyclophosphamide plus atg (atg-cy, n = 17) or cyclophosphamide plus busulfan (bu-cy, n = 24). the substitution of bu for atg was motivated by the high cost of atg. there were no differences in the clinical features between the two groups, including age, gender, cytomegalovirus status, abo match, interval between diagnosis and transplant, and number of total nucleated cells infused. no differences were observed in the time to neutrophil and platelet engraftment, or in the risk of veno-occlusive disease and hemorrhage. however, there was a higher risk of mucositis in the bu-cy group (71 vs 24%, p = 0.004). there were no differences in the incidence of neutrophil and platelet engraftment, acute and chronic graft-versus-host disease, and transplant-related mortality. there was a higher incidence of late rejection in the atg-cy group (41 vs 4%, p = 0.009). although the atg-cy group had a longer follow-up (101 months) than the bu-cy group (67 months, p = 0.04), overall survival was similar between the groups (69 vs 58%, respectively, p = 0.32). we conclude that the association bu-cy is a feasible option to the conventional atg-cy regimen in this population.
Prevalência de tuberculose bovina em animais e rebanhos abatidos em 2009 no estado de Mato Grosso, Brasil
Furlanetto, L.V.;Figueiredo, E.E.S.;Conte Júnior, C.A.;Silva, F.G.S.;Duarte, R.S.;Silva, J.T.;Lilenbaum, W.;Paschoalin, V.M.F.;
Arquivo Brasileiro de Medicina Veterinária e Zootecnia , 2012, DOI: 10.1590/S0102-09352012000200004
Abstract: the prevalence of bovine tuberculosis in cattle, and its herds, slaughtered in 2009 in the state of mato grosso, brazil, was estimated using bacteriological analysis and molecular test, from fragments of injured tissues as well as direct dna templates. 41,193 cattle, which appeared healthy in the ante mortem examination, from seven selected slaughterhouses, under brazilian federal inspection services (sif), were inspected. the animals were from 492 herds located in 85 (60%) different cities of mato grosso. a total of the 198 carcasses had suspicious lesions. three carcasses (3/198) had lesions that were found to be tuberculous in laboratory diagnosis. the apparent prevalence of bovine tuberculosis in the total number of animals and in herds slaughtered in mato grosso was 0.007% [ic 95% = -0.001%; 0.016%] and 0.61% [ic 95% = -0.08%; 1.30%], respectively. the sanitation status demonstrated in mato grosso indicates the progress in this state toward the eradication of bovine tuberculosis.
Fotossíntese de biótipos de azevém sob condi??o de competi??o
Concen?o, G.;Ferreira, E.A.;Silva, A.A.;Ferreira, F.A.;Galon, L.;Reis, M.R.;d'Antonino, L.;Vargas, L.;Silva, L.V.B.D.;
Planta Daninha , 2008, DOI: 10.1590/S0100-83582008000300015
Abstract: characteristics associated with photosynthetic activity of ryegrass biotypes, susceptible and resistant to glyphosate, were evaluated under different competition levels. the experiment was installed in a factorial design, with two ryegrass biotypes, susceptible and resistant to glyphosate, growing in the plot center, surrounded by 0, 1, 2, 3, and 4 plants of the opposite biotype. fifty days after emergence, stomatal gas flow rate (u μmol s 1), sub-stomatal co2 concentration (ci - μmol mol-1) and photosynthetic rate (a μmol m-2 s-1 ) were evaluated, with the co2 used in photosynthesis (δc - μmol mol-1) being calculated as the difference between the reference co2 and the co2 in the evaluation chamber. data were collected using an infrared gas analyzer (irga), model lca4 (adc company), followed by building a correlation matrix between the variables. the ryegrass biotypes susceptible and resistant to glyphosate did not differ in relation to the photosynthetic activity in absence of competition. however, the photosynthetic rate was reduced in function of increasing competition with plants of the opposite biotype for both the resistant and susceptible biotypes, and for the resistant biotype when in competition with plants of the same biotype. this behavior was attributed to reciprocal shading and light competition.
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