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Search Results: 1 - 10 of 124596 matches for " José Carlos;Nascimento Filho "
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Determina??o de fatores de empilhamento através de fotografias digitais
Soares, Carlos Pedro Boechat;Ribeiro, José Carlos;Nascimento Filho, Moacir Batista do;Ribeiro, José Carlos Lopes;
Revista árvore , 2003, DOI: 10.1590/S0100-67622003000400007
Abstract: the objective of this work was to analyze the accuracy of piling factor estimates using digital photography and software especially developed for this purpose. six trucks carrying five piles each, owned by acesita energética ltd., were used in this research. the analysis revealed that the average difference between the factors determined by the photographic method and the actual factors was approximately 3.2%, with a tendency for over estimation of the values obtained by the photographic method. the "t" test analysis suggested that the differences observed between these factors were mainly due to the the poor piling up of the wood.
Determina o de fatores de empilhamento através de fotografias digitais
Soares Carlos Pedro Boechat,Ribeiro José Carlos,Nascimento Filho Moacir Batista do,Ribeiro José Carlos Lopes
Revista árvore , 2003,
Abstract: O objetivo deste trabalho foi analisar a exatid o de estimativas de fatores de empilhamento obtidas através de fotografias digitais e de software especialmente desenvolvido para esta finalidade, em pilhas sobre caminh es. Para isto, foram utilizados seis caminh es com cinco pilhas cada um, pertencentes à ACESITA ENERGéTICA Ltda. Após as análises, verificou-se que a diferen a média entre os fatores obtidos pelo método fotográfico e os fatores reais foi da ordem de 3,2%, com tendência de superestima o dos fatores obtidos pelo método fotográfico. Pelo teste "t", verificou-se, também, que os fatores obtidos pelo método fotográfico diferiram dos fatores reais, principalmente devido ao mau empilhamento da madeira.
Thermoelastic properties on Cu-Zn-Al shape memory springs
Oliveira, Carlos Augusto do Nascimento;Gonzalez, Cezar Henrique;Araújo, Carlos José de;Araújo Filho, Oscar Olímpio de;Urtiga Filho, Severino Leopoldino;
Materials Research , 2010, DOI: 10.1590/S1516-14392010000200016
Abstract: this paper present a thermomechanical study of actuators in form of helical springs made from shape memory alloy wires that can work as actuator and/or as sensor. these abilities are due to the martensitic transformation. this transformation is a diffusionless phase transition that occurs by a cooperative atomic rearrange mechanism. in this work, helical spring actuators were manufactured from cu-zn-al shape memory alloy wires. the springs were submitted to constant tensile loads and thermal cycles. this procedure allows to determine thermoelastic properties of the shape memory springs. thermomechanical properties were analyzed during 50 thermal cycles in the temperature range from 20 to 130 °c. results of variations in critical transformation temperatures, thermoelastic strain and thermal hysteresis are discussed based on defects rearrangement and martensitic transformation theory.
A review of techniques for spatial modeling in geographical, conservation and landscape genetics
Diniz-Filho, José Alexandre Felizola;Nabout, Jo?o Carlos;Telles, Mariana Pires de Campos;Soares, Thannya Nascimento;Rangel, Thiago Fernando L.V.B.;
Genetics and Molecular Biology , 2009, DOI: 10.1590/S1415-47572009000200001
Abstract: most evolutionary processes occur in a spatial context and several spatial analysis techniques have been employed in an exploratory context. however, the existence of autocorrelation can also perturb significance tests when data is analyzed using standard correlation and regression techniques on modeling genetic data as a function of explanatory variables. in this case, more complex models incorporating the effects of autocorrelation must be used. here we review those models and compared their relative performances in a simple simulation, in which spatial patterns in allele frequencies were generated by a balance between random variation within populations and spatially-structured gene flow. notwithstanding the somewhat idiosyncratic behavior of the techniques evaluated, it is clear that spatial autocorrelation affects type i errors and that standard linear regression does not provide minimum variance estimators. due to its flexibility, we stress that principal coordinate of neighbor matrices (pcnm) and related eigenvector mapping techniques seem to be the best approaches to spatial regression. in general, we hope that our review of commonly used spatial regression techniques in biology and ecology may aid population geneticists towards providing better explanations for population structures dealing with more complex regression problems throughout geographic space.
Relato de caso autóctone de leishmaniose visceral canina na zona sul do município do Rio de Janeiro
Figueiredo, Fabiano Borges;Barbosa Filho, Carlos José de Lima;Schubach, Edvar Yuri Pacheco;Pereira, Sandro Antonio;Nascimento, Lílian Dias;Madeira, Maria de Fátima;
Revista da Sociedade Brasileira de Medicina Tropical , 2010, DOI: 10.1590/S0037-86822010000100022
Abstract: brazil is facing expansion and urbanization of american visceral leishmaniasis, with human and canine cases in several large-sized cities. this report describes an autochthonous case of canine visceral leishmaniasis in a nonendemic area in the municipality of rio de janeiro.
Are routine preoperative medical tests needed with cataract surgery?
Lira,Rodrigo P. C.; Nascimento,Maurício A.; Moreira-Filho,Djalma C.; Kara-José,Newton; Arieta,Carlos E. L.;
Revista Panamericana de Salud Pública , 2001, DOI: 10.1590/S1020-49892001000700003
Abstract: objective. the objective of this study was to investigate whether routine medical testing before cataract surgery reduces the rate of complications during the perioperative period in adults. methods. the study was carried out in an academic medical center in brazil, between 10 february 2000 and 10 january 2001. the scheduled cataract operations were randomly assigned to one of two groups: 1) to be preceded by routine testing (the "routine-testing group") or 2) not to be preceded by routine medical testing (the "selective-testing group"). if the patient was assigned to the selective-testing group, it was requested that no preoperative testing be performed unless the patient presented with a new or worsening medical problem that would warrant medical evaluation with testing. in the case of patients assigned to the routine-testing group, three tests were requested: a 12-lead electrocardiogram, a complete blood count, and measurements of serum glucose. results. the sample of 1 025 patients scheduled to undergo cataract surgery was comprised of 512 assigned to the routine-testing group and of 513 assigned to the selective-testing group. the two groups had similar proportions of operations canceled and not subsequently rescheduled, 2% in each group. the cumulative rate of medical events was similar in the two groups, 9.6% in the routine-testing group and 9.7% in the selective-testing group (p = 0.923). the types of medical events were also similar in both groups. discussion. the results of this study suggest that routine medical testing before cataract surgery does not reduce the rate of complications during the perioperative period. the results also suggest it would be more efficient not to request routine preoperative tests unless indicated by patient history or physical examination.
LAMBERTUCCI, Roberto;RAYES, Abdunnabi;SERUFO, José Carlos;TEIXEIRA, Daniela Moura;GERSPACHER-LARA, Rogério;NASCIMENTO, Evaldo;BRASILEIRO-FILHO, Geraldo;SILVA, Ana Cristina;
Revista do Instituto de Medicina Tropical de S?o Paulo , 1998, DOI: 10.1590/S0036-46651998000600008
Abstract: we report a case of tropical pyomyositis in a boy who presented with a severe febrile illness associated with diffuse erythema, and swelling in many areas of the body which revealed on operation extensive necrotic areas of various muscles that required repeated débridement. the patient gave a history of contact with dogs, and an elisa test for toxocara canis was positive. he also presented eosinophilia and high serum ige levels. staphylococcus aureus was the sole bacteria isolated from the muscles affected. we suggest that tropical pyomyositis may be caused by the presence of migrating larvae of this or other parasites in the muscles. the immunologic and structural alterations caused by the larvae, in the presence of concomitant bacteremia, would favour seeding of the bacteria and the development of pyomyositis.
Heat treatments and thermomechanical cycling influences on the R-phase in Ti-Ni shape memory alloys
Gonzalez, Cezar Henrique;Oliveira, Carlos Augusto do Nascimento;Pina, Euclides Apolinário Cabral de;Urtiga Filho, Severino Leopoldino;Araújo Filho, Oscar Olimpio de;Araújo, Carlos José de;
Materials Research , 2010, DOI: 10.1590/S1516-14392010000300008
Abstract: this article studies changes observed on the r-phase thermoelastic behavior in a near-equiatomic ti-ni shape memory alloy. three kinds of procedures have been performed: different treatments, thermomechanical cycling under constant loading in shape memory helical springs and thermal cycling in as-treated and trained samples. several heat treatments were carried out to investigate evolution of the r-phase by differential scanning calorimetry (dsc). a heat treatment was chosen on which r-phase is absent. shape memory springs were produced and submitted to a training process in an apparatus by tensioning the springs under constant loading. thermal cycling in dsc was realized in as-treated and trained samples. several aspects of one-step (b2→b19') and two-steps (b2→r→b19') martensitic transformations and r-phase formation and their evolution during tests were observed and discussed.
Levantamento randomizado sobre a prevalência de tabagismo nos maiores municípios do Brasil
Leit?o Filho, Fernando Sergio;Galduróz, José Carlos Fernandes;Noto, Ana Regina;Nappo, Solange Aparecida;Carlini, Elisaldo Araújo;Nascimento, Oliver Augusto;Santos, Sérgio Ricardo;Jardim, José Roberto;
Jornal Brasileiro de Pneumologia , 2009, DOI: 10.1590/S1806-37132009001200007
Abstract: objective: to provide access to the results of a randomized cross-sectional study conducted by the brazilian center for information on psychotropic drugs in 2001. methods: this survey involved a random sample of individuals ranging from 12 to 65 years of age and residing in the 107 largest cities (over 200,000 inhabitants) in brazil, which represented 27.7% of the brazilian population, estimated to be 169,799,170 inhabitants at the time. a total of 8,589 interviews were conducted. the substance abuse and mental health services administration questionnaire, translated and adapted for use in brazil, was used in the interviews. results: of the sample as a whole, 41.1% of the interviewees reported having experimented with tobacco products. the prevalence of daily smokers was 17.4% (20.3% among males and 14.8% among females). we found that 9% of the sample (10.1% of the men and 7.9% of the women) were nicotine-dependent, according to the criteria of the national household survey on drug abuse. conclusions: the prevalence of current smoking in the 107 largest cities of brazil is significantly lower in this decade than was the national prevalence at the end of last century.
Estabilizador de sistemas de potencia digital aplicado a uma unidade geradora da uhe de Tucurui
Nogueira, Fabrício G;Barra Junior, Walter;Costa Junior, Carlos T. da;Barreiros, José A. L;Nascimento Filho, Paulo S;Moraes, Anderson R. B;Gomes, Marcus Ciro;Lana, Janio José de;
Sba: Controle & Automa??o Sociedade Brasileira de Automatica , 2011, DOI: 10.1590/S0103-17592011000500008
Abstract: this paper presents the development and results of field tests of a digital power system stabilizer (pss), designed for the damping of electromechanical oscillations in interconnected systems. experimental tests were performed in a 350 mva hydrogenerator unit, of the tucurui power plant. the pss damper control law was embedded in a digital hardware system based on a digital signal controller (dspic 30f5011). the structure of the control law is in discrete time rst canonical form, and the controller parameters were calculated using the pole shifting technique. for purposes of the controller design, the dynamics of the plant, in the considered operating point, was represented by a parametric model, which was estimated from data measured in the field. the experimental results showed an excellent performance of the damping of electromechanical modes observable uhe tucurui by digital pss.
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