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Search Results: 1 - 10 of 51926 matches for " Luiz Afonso dos Santos Senna "
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MODELLING TRANSPORT
Luiz Afonso dos Santos Senna
Transportes , 2010,
Abstract: Esta é sem dúvida, uma daquelas obras que todo pesquisador gostaria de ter escrito. Juan de Dios Ortúzar e Luis G. Willumsen conseguem sistematizar o conhcimento existente na área de uma forma que permite a leitores iniciados, profissionais do meio e estudantes de cursos avan ados, dispor de uma obra que é ao mesmo tempo abrangente e profunda. A extensa experiência acadêmica e prática dos autores é, sem dúvida, responsável pela qualidade da obra.
A aceita o do pedágio por parte dos usuários gaúchos
Luiz Afonso dos Santos Senna,Fernando Outra Michel
Transportes , 2009,
Abstract: o presente trabalho analisa a aceita o por parte dos usuários, do Programa de Concess es Rodoviárias do Rio Grande do Sul. A análise tomou por base pesquisa de preferência declarada realizada junto a usuários das rodovias gaúchas. Foi elaborada uma metodologia que estruturou a análise do impacto causado pela ado o do pedágio na percep o dos usuários em rela o a quatro atributos (qualidade do pavimento, sinaliza o, servi os ofertados e pre o do pedágio). Os atributos foram divididos em níveis, apresentados através de fotos que sintetizavam os cenários propostos. O modelo Logit multinomial foi utilizado no processo de modelagem. A análise dos resultados indica que tanto os usuários de automóveis quanto os de caminh es atribuem ao atributo pavimento um maior valor monetário do que a sinaliza o e servi os. Os resultados obtidos a partir da modelagem indicam que os valores atualmente praticados s o aceitáveis para os usuários de automóveis. Os modelos sugerem que valores ligeiramente superiores continuariam a ter aceita o. Os caminh es, por outro lado, est o dispostos a pagar cerca de 80% do valor praticado à época.
Determina o dos custos associados à qualidade dos pavimentos através de técnicas de preferência declarada
Roberlaine Ribeiro Jorge,Helena Beatriz Bettella Cybis,Luiz Afonso dos Santos Senna
Transportes , 2010,
Abstract: O objetivo deste artigo é identificar e quantificar o custo associado à qualidade da pavimenta o no meio interurbano. O pressuposto é que a qualidade do pavimento exerce influência na defini o dos padr es de viagem e, por conseguinte, deve ser integrada aos demais atributos da fun o de custo nos modelos de aloca o de tráfego. Este trabalho apresenta uma metodologia com vistas a introduzir a influência deste parametro na modelagem da aloca o de tráfego. Entre as principais conclus es extraídas dos experimentos realizados, destacam-se a comprova o da importancia da qualidade da pavimenta o no processo de escolha de rotas. ABSTRACT The aim of this paper is to identify the costs associated to the quality of road pavements in interurban areas. The main assumption in this work is that pavement quality may be an important issue in the definition of travel patterns and therefore should be in costs functions of traffic assignment models. This work presents the methodology devised to include the effect of the pavement quality on traffic assignment models. The analysis of exploratory tests suggest that the quality of road pavements can play an important role in the route choice process.
Aplica o de QFD e preferência declarada no transporte de cabotagem
Marc Alan Stanton,Fernando Dutra Michel,?ngela de Moura Ferreira Danilevicz,Luiz Afonso dos Santos Senna
Transportes , 2009,
Abstract: Este artigo versa sobre qualidade de servi o em logística. S o utilizadas duas técnicas que se baseiam na pesquisa de mercado, disponíveis há algumas décadas: Quality Function Deployment (QFD) e Preferência Declarada (PD). Embora n o sejam novas, o uso combinado destas técnicas tem como objetivo encontrar respostas para duas freqüentes quest es do mundo dos negócios: o que desejam os consumidores e quanto eles est o dispostos a desembolsar pela satisfa o de suas necessidades. A pesquisa foi realizada na indústria de transporte, com ênfase no aumento do volume transportado por cabotagem ao longo da costa brasileira.A identifica o dos fatores determinantes da escolha da cabotagem, através do QFD, e a propens o em pagar por estes atributos, através da PD, permite aos ofertantes deste servi o criar uma posi o competitiva sustentável, maximizando o potencial do servi o.
Avalia o financeira dos mecanismos de concess o com prazo variável
Homero Neves da Silva,Fernando Dutra Michel,Luiz Afonso dos Santos Senna,Antonio Nú?ez
Transportes , 2009,
Abstract: Este trabalho é devotado à avalia o do risco de tráfego em concess es de infra-estruturas rodoviárias. Dentre os principais meios encontrados para minimizar os efeitos do risco de tráfego aos concessionários encontra-se a utiliza o de mecanismos de concess o baseado em contratos com prazo variável. Dois mecanismos têm sido desenvolvidos com este objetivo e foram avaliados neste trabalho: LPVR, proposto por Engel, Fischer e Galetovic e implantado no Chile em meados da década de 1990; e LPVNR, proposto por Nombela e de Rus a partir do final da mesma década. A avalia o dos mecanismos foi realizada utilizando simula o Monte Carlo. Para a realiza o da avalia o, foi desenvolvido um modelo financeiro que propiciasse análises de projetos com dura o n o definida exante. As variáveis utilizadas nos testes foram: as taxas de desconto utilizadas nos projetos; os horizontes de tempo das concess es (dura o esperada); e a extens o máxima que a dura o pode ter, além da dura o esperada.
Angioarchitecture and clinical presentation of brain arteriovenous malformations
Santos, Marcio Luiz Tostes dos;Demartini Júnior, Zeferino;Matos, Luiz Afonso Dias;Spotti, Antonio Ronaldo;Tognola, Waldir Ant?nio;Sousa, Atos Alves de;Santos, Rosangela Minto Tostes dos;
Arquivos de Neuro-Psiquiatria , 2009, DOI: 10.1590/S0004-282X2009000200031
Abstract: the purpose of this study was to correlate the angioarchitecture of brain arteriovenous malformations (avm) with their clinical presentation. a total of 170 patients with avm 78 males and 92 females, were studied. univariate and multivariate analyses were conducted in order to test the associations between morphological features and clinical presentation. the most frequent clinical presentations at diagnosis were hemorrhage in 89 (52%) patients, headache in 79 (46%), focal neurological deficit in 54 (32%), and seizure in 52 (31%). according to the spetzler-martin classification, grade i was found in 15 patients, ii in 49, iii in 55, iv in 41, and grade v in 10 patients. avm with small nidus size, single feeding artery and single draining vein were associated with hemorrhage. hemorrhage was positively associated with spetzler-martin grade i and negatively with grade v. the association between seizure and large nidus size was positive, however negative with small nidus size.
Freqüência cardíaca máxima em esteira ergométrica em diferentes horários
Afonso, Leandro dos Santos;Santos, Jo?o Fernando Brinkmann dos;Lopes, José Ricardo;Tambelli, Rodrigo;Santos, Eduardo Henrique Rosa;Back, Flavio Augustino;Menna-Barreto, Luiz;Lima, Jorge Roberto Perrout de;
Revista Brasileira de Medicina do Esporte , 2006, DOI: 10.1590/S1517-86922006000600004
Abstract: the aim of this study was to compare the maximal heart rate (hrmax) in the bruce test (tbruce) at different times of the day, since several measurements of the human performance present circadian variations which seem to follow the body temperature rhythm. eleven male individuals, with 22.0 ± 1.6 years, physically active and from the intermediate chronotype were studied. the resting hr (hrres), maximal hr (hrmax), perceived exertion (pe) and time until exhaustion (tbruce) were observed. the polar vantage nv cardiofrequencymeter was used in order to measure the hr. the pe was obtained through the borg's scale (6-20). the protocol by bruce for treadmill was applied until exhaustion, at 6 different times: 9:00; 12:00; 15:00; 18:00; 21:00 and 24:00 hours. the results were submitted to the variance analysis for repeated measurements, followed by tukey test (p < 0.05) and the cosinor adjustment for identification of rhythmic patterns. there was significant difference between the hrres of the 15:00 and 24:00 h (67.2 ± 6.9 and 60.4 bpm) and in the hr max of the 12:00 and 24:00 hours (197.4 ± 7.9 and 191.3 ± 5.8 bpm). no difference was identified in the pe and in the tbruce. rhythmicity was found in 1 individual in the hrres, 1 in the hrmax and 2 in the tbruce. it was concluded that in uncontrolled conditions, whenever daily activities are kept, both hrres and hrmax present lower indices around 24:00 hours, with no loss in the maximal aerobic performance and no pe alteration. these findings should be considered in the aerobic evaluation and in the exercises prescription at later times.
Coeficiente de repetibilidade e parametros genéticos em capim-elefante
Cavalcante, Marcelo;Lira, Mário de Andrade;Santos, Mércia Virgínia Ferreira dos;Pita, Eduardo Bruno Afonso Ferreira;Ferreira, Rinaldo Luiz Caraciolo;Tabosa, José Nildo;
Pesquisa Agropecuária Brasileira , 2012, DOI: 10.1590/S0100-204X2012000400013
Abstract: the objective of this work was to determine the coefficients of repeatability of morphophysiological traits in elephant grass (pennisetum spp.) genotypes, from data obtained during six evaluation cycles. the minimum number of measurements and genetic parameters were estimated. the experiment design was a randomized complete block, in a split?plot arrangement, with four n levels (control, 30, 60, and 90 kg ha?1 per cut) and 16 pennisetum genotypes (11 interspecific hybrids and five cultivars). the cycles consisted of evaluations in 2010 (4/21, 7/19, and 9/28) and 2011 (1/6, 4/7, and 8/3). the coefficients of repeatability were of medium?high magnitude for all variables, indicating that there was regularity between repeated measures. for the variables forage mass, plant height, leaf length and width, stem diameter, leaf chlorosis and area index, three cycles of evaluation are enough to reach r2 of 90% by principal component analysis. for internode length, the minimal of seven evaluations is necessary to predict the true value of genotypes. the genetic parameters of the variables forage mass, leaf length and width, stem diameter and leaf chlorosis are of high magnitude, favoring the selection of superior pennisetum genotypes.
A retrospective serologic survey of hantavirus infections in the county of Cássia dos Coqueiros, State of S?o Paulo, Brazil
Badra, Soraya Jabur;Maia, Felipe Gon?alves Mota;Figueiredo, Glauciane Garcia;Santos Junior, Gilberto Sabino dos;Campos, Gelse Mazzoni;Figueiredo, Luiz Tadeu Moraes;Passos, Afonso Dinis Costa;
Revista da Sociedade Brasileira de Medicina Tropical , 2012, DOI: 10.1590/S0037-86822012005000005
Abstract: introduction: in recent years, hantavirus infections producing severe diseases have obtained an increased attention from public health authorities from the countries of eurasia to the americas. brazil has reported 1,300 cases of hantavirus cardiopulmonary syndrome (hcps) from 1993 to 2010, with about 80 of them occurring in the northeast of the state of s?o paulo, with 48% fatality rate. araraquara virus was the causative agent of hcps in the region. considering that hantaviruses causing human disease in the americas were unknown until 1993, we have looked for hantavirus infections in the population of cássia dos coqueiros county, northeast of the state of s?o paulo, brazil, before this time. this county has about 2,800 inhabitants and an economy based on agriculture, including cultivation of brachiaria decumbens grass. the grass seeds are an important rodent attraction, facilitating transmission of hantavirus to man. four hcps cases were reported so far in the county. methods: in this study, 1,876 sera collected from 1987 to 1990 were tested for igg to hantavirus by igg-elisa, using the n recombinant protein of araraquara virus as antigen. results: positive results were observed in 89 (4.7%) samples, which were all collected in 1987. the positivity among urban inhabitants was 5.3%, compared with 4.3% among those living in rural areas. conclusions: our results showed that hantavirus infections occurred in cássia dos coqueiros, completely unrecognized, even before hantaviruses were described in the americas.
INFLUêNCIA DA INFEC O INTRAMAMáRIA SOBRE AS CARACTERíSTICAS FíSICO-QUíMICAS DO LEITE DE OVELHAS DA RA A SANTA INêS
Mayra Zilta P. R. B. de Almeida,Luiz Gustavo Lopes de Oliveira,José Augusto Bastos Afonso,Norma dos Santos Lázaro
Ciência Animal Brasileira , 2009,
Abstract:
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