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Search Results: 1 - 10 of 343218 matches for " Celso E. L.; "
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Human thermal comfort: an irreversibility-based approach emulating empirical clothed-body correlations and the conceptual energy balance equation
Rabi, José A.;Silva, Robson L.;Oliveira, Celso E. L.;
Journal of the Brazilian Society of Mechanical Sciences and Engineering , 2012, DOI: 10.1590/S1678-58782012000400005
Abstract: exergetic analysis can provide useful information as it enables the identification of irreversible phenomena bringing about entropy generation and, therefore, exergy losses (also referred to as irreversibilities). as far as human thermal comfort is concerned, irreversibilities can be evaluated based on parameters related to both the occupant and his surroundings. as an attempt to suggest more insights for the exergetic analysis of thermal comfort, this paper calculates irreversibility rates for a sitting person wearing fairly light clothes and subjected to combinations of ambient air and mean radiant temperatures. the thermodynamic model framework relies on the so-called conceptual energy balance equation together with empirical correlations for invoked thermoregulatory heat transfer rates adapted for a clothed body. results suggested that a minimum irreversibility rate may exist for particular combinations of the aforesaid surrounding temperatures. by separately considering the contribution of each thermoregulatory mechanism, the total irreversibility rate rendered itself more responsive to either convective or radiative clothing-influenced heat transfers, with exergy losses becoming lower if the body is able to transfer more heat (to the ambient) via convection.
Compara??o do Coeficiente Global de Perdas de Calor para casa de vegeta??o aquecida usando diferentes técnicas para eficiência energética
Oliveira, Celso E. L. de;Garcia, José L.;De La Plaza, Saturnino;Chaya, Carolina;
Engenharia Agrícola , 2006, DOI: 10.1590/S0100-69162006000200003
Abstract: the global heat loss coefficient (u) allows some answers about thermal requirements of climatic greenhouse. this trial determined this coefficient for a greenhouse in madrid (spain) where night measurements of inside and outside air temperature as well as energy consumption to heat were used. comparisons were accomplished among the used heating techniques as: radiant floor and heat fan combined with two techniques aiming to promote a better thermal which means the use of a plastic covering forming a double couple or the use of a plastic tunnel. the lowest coefficients for the use of radiant soil with tunnel and heat fan with double couple were respectively 7.19 w m-2 oc-1 and 9.11 w m-2 oc-1 and the largest value was 15.13 w m-2 oc-1 for the heat fan use without plastics. therefore, the results registered best thermal efficiency for the tested techniques.
Avalia??o de classificadora de cilindros divergentes para tomate "Carmen"
Atarassi, Márcia E;Ferreira, Marcos D;Braunbeck, Oscar A;Moretti, Celso L;
Engenharia Agrícola , 2010, DOI: 10.1590/S0100-69162010000200016
Abstract: grading standards guarantee consistent quality for growers, wholesalers and consumers, helping the trading, adding value to products and reducing postharvest losses. the main purpose of this study was to evaluate a grading diameter system for fresh market tomatoes in a rotative cylinder equipment in different rotation velocities. sorting efficiency, based on the standard diameter of the brazilian program for the horticulture modernization (2003) and mechanical damage incidence for "carmen" tomatoes were evaluated. the divergent cylinders were in accordance with grade mixing in classes 60 and 80 grading. however, for grade 70 no treatment was in accordance with the mixture percentage allowed, which is 10% of fruit from other classes. the combination of a flat and a helical rubber cylinder, both at 150 rpm, had the highest sorting efficiency, showing low weight loss and respiratory activity rates, values similar to the ones found for control treatments.
Efetividade do metoprolol na preven o de fibrila o e flutter atrial no pós-operatório de cirurgia de revasculariza o miocárdica
Lúcio Eraldo de Azevedo,Flores Adriana,Blacher Celso,Le?es Paulo E.
Arquivos Brasileiros de Cardiologia , 2004,
Abstract: OBJETIVO: Avaliar a efetividade do metoprolol na preven o de fibrila o e flutter atrial clinicamente detectáveis após cirurgia de revasculariza o miocárdica. MéTODOS: Ensaio clínico, randomizado e aberto, para tratar 200 pacientes submetidos à cirurgia de revasculariza o miocárdica isolada com circula o extracorpórea, randomizados para receber metoprolol, por via oral, ou para n o receber a medica o no pós-operatório. Os desfechos de interesse eram a detec o de fibrila o e flutter atrial sustentados, sintomáticos ou que requeressem tratamento. Excluídos do estudo os pacientes com fra o de eje o basal do ventrículo esquerdo < 35%, fibrila o atrial prévia, história de broncoespasmo, bloqueios atrioventriculares de 2o e 3o grau, baixo débito cardíaco e insuficiência cardíaca. RESULTADOS: Arritmias ocorreram em 11 de 100 pacientes do grupo metoprolol e em 24 de 100 pacientes do grupo controle (p=0,02). O risco relativo (RR) foi 0,46 (IC de 95%= 0,24-0,88) e o número necessário para tratar (NNT) e evitar o desfecho foi de 8 pacientes. A fibrila o atrial foi a arritmia mais freqüentemente observada (30/35). Em 38 pacientes com idade > 70 anos, as arritmias ocorreram em 2 de 19 pacientes do grupo metoprolol e em 10 de 19 do grupo controle (c2 Yates: p=0,01). O risco relativo foi 0,20 (IC de 95%= 0,05-0,79) e o número necessário para tratar foi de 2 pacientes. CONCLUS O: O metoprolol é efetivo na preven o de fibrila o e flutter atrial no PO de cirurgia de revasculariza o miocárdica, sendo esse efeito mais marcante no grupo de pacientes idosos.
Tratamento cirúrgico da otite média com efus o: tubo de ventila o versus aplica o tópica de mitomicina C
Becker Celso G.,Silva Alcino L. da,Guimar?es Roberto E. S.,Becker Helena M. G.
Revista Brasileira de Otorrinolaringologia , 2003,
Abstract: O uso do tubo de ventila o (TV) da orelha média, tratamento cirúrgico eleito da otite média com efus o (OME), n o é isento de complica es, promovendo ainda limita o social pela necessidade de abandono dos banhos de imers o. A mitomicina C (MMC) é um antineoblástico, cuja aplica o tópica retarda a fibrose e previne a estenose cicatricial. Em cobaias, retardou o fechamento de timpanotomias, permitindo maior tempo de aera o da orelha média, à semelhan a dos tubos de ventila o. FORMA DE ESTUDO: Clínico prospectivo. OBJETIVO: Comparar a eficácia entre timpanotomia, aspirado da efus o e inser o de tubo de ventila o (grupo TV) versus timpanotomia, aspirado da efus o e aplica o tópica de mitomicina C (grupo MMC). Comparar o tempo de manuten o da timpanotomia e a incidência de complica es nos dois grupos. RESULTADOS: O grupo MMC apresentou eficácia significativamente menor (52% versus 80%) que o grupo TV (p= 0,34). A presen a de timpanometria tipo "B" e a ausência de comprometimento do óstio faríngeo tubário pelo tecido adenóide no pré-operatório representaram fatores de mau prognóstico. A aplica o tópica de MMC nas bordas da timpanotomia proporcionou um tempo de abertura da membrana timpanica por duas a três semanas. No grupo TV, a otorréia foi observada em 13,3% dos pacientes. No grupo MMC, apesar da menor eficácia, nenhum paciente apresentou complica es nem sofreu prolongada proibi o dos banhos de imers o. CONCLUS O: Apesar de concluirmos que o TV apresenta maior eficácia, novos estudos utilizando maior concentra o, maior tempo de aplica o ou o uso seriado de MMC no tratamento da otite média com efus o devem ser realizados.
Efetividade do metoprolol na preven??o de fibrila??o e flutter atrial no pós-operatório de cirurgia de revasculariza??o miocárdica
Lúcio, Eraldo de Azevedo;Flores, Adriana;Blacher, Celso;Le?es, Paulo E.;Lucchese, Fernando A.;Ribeiro, Jorge Pinto;
Arquivos Brasileiros de Cardiologia , 2004, DOI: 10.1590/S0066-782X2004000100004
Abstract: objective: to assess the effectiveness of metoprolol in preventing clinically detectable atrial fibrillation (af) and flutter after coronary artery bypass graft (cabg) surgery . methods: an open, randomized study was carried out to treat 200 patients who had undergone isolated cabg surgery with extracorporeal circulation. the patients were randomized to either receive metoprolol orally or not to receive the medication in the postoperative period. the outcomes were the detection of sustained atrial af and flutter, which were symptomatic or required treatment. the patients with the following characteristics were excluded from the study: baseline left ventricular ejection fraction < 35%; previous af; history of bronchospasm; second- and third-degree atrioventricular blocks, low cardiac output, and heart failure. results: arrhythmias occurred in 11 out of 100 patients in the metoprolol group and in 24 out of 100 patients in the control group (p=0.02). the relative risk (rr) was 0.46 (95% ci = 0.24-0.88), and the number necessary to treat (nnt) and avoid the outcome was 8 patients. af was the arrhythmia most frequently observed (30/35). in 38 patients aged 70 years or more, the arrhythmias occurred in 2 out of 19 patients in the metoprolol group and in 10 out of 19 patients in the control group (c2 yates: p=0.01). the relative risk was 0.20 (95% ci = 0.05-0.79) and the number necessary to treat was 2 patients. conclusion: metoprolol is effective in preventing af and flutter in the postoperative period of cabg surgery, and this effect was more evident in the group of elderly patients.
Evaluation in physics teaching: make it an opportunity for further learning
Celso L. Ladera
Latin-American Journal of Physics Education , 2009,
Abstract: Evaluation is a key stage in all teaching-learning processes, but it usually demands significant efforts of preparationfrom students and teachers, not to mention that it is very time-consuming. The traditional model of evaluationprescribes that students must sit periodically to demonstrate that they can recite blocks of knowledge, and solveexercises and problems which usually resemble or refers to the same set of study cases presented in lectures, in thelaboratory, or the textbooks. Thus conceived, evaluation is indeed lacking, particularly in physics teaching: Did thestudents just learn how to pass this exam? Pass without real learning!. In this work I present a set of new, hereticalideas concerning possible changes in physics teaching evaluation, namely: (i) exploiting the exams as opportunities forfurther learning, (ii) examinations as a way of acquisition of new knowledge, or learning new analytical techniques,and (iii) exams as an opportunity for the application of standard powerful tools which students learned in their previousmathematics and physics courses. I present evidence of the quality-of-learning discriminatory power of new model ofevaluation. The changes proposed are partially supported by Herzberg model of psychological growth recently adaptedand applied to physics education.
A??o anti-helmíntica de extratos brutos de Andira anthelmia (Vell.) Macbr. e Andira fraxinifolia Benth., em camundongos naturalmente infectados por Vampirolepis nana e Aspiculuris tetraptera
DA CUNHA E SILVA,SANDRA L.; BORBA,HéLCIO R.; DO BONFIM,TERESA C. B; DE CARVALHO,MARIO G.; CAVALCANTI,HAROLDO L.; BARBOSA,CELSO G.;
Parasitología latinoamericana , 2003, DOI: 10.4067/S0717-77122003000100004
Abstract: the anthelmintic activity of the crude extracts of fresh and dry leaf, trunk bark and root bark of the species andira anthelmia and andira fraxinifolia. was evaluated in the species vampirolepis nana and aspiculuris tetraptera. doses of 8 g/kg/day were utilized for the leaves and trunk bark, and 1, 2, 4 and 8 g/kg/day for the root bark for the a. anthelmia, and doses of 8 g/kg/day were utilized for leaves and root bark, and of 4, 8 and 16 g/kg/day for tree bark, for the a. fraxinifolia. the dose of 8 g/kg/day of the crude extract of the fresh and dry leaf, the trunk bark and root bark, of the a. anthelmia, when compared, did not present any significant difference in the percentage elimination of v. nana, 14.9%, 16.4%, 6.3%, 17.9%, respectively. the same occurred when compared with the control group (7.4%). the doses of 2 and 4 g/kg/day, 49.4% and 42.7, respectively, were significantly more active for v. nana, in comparison with the other anatomical parts and the control group, and did not present any difference in relation to the mebendazole. the 2 g/kg/day dose was significantly more active for a. tetraptera (63.2%), in comparison with the leaves, with the root bark for the doses of 1 and 4 g/kg/day, and with the control group, 1.2%, 1.7%, 31.7%, 15.3%, 0.1%, respectively. however, it did not present any significant difference in relation to nitroscanate, this being less active than mebendazole. although the 8 g/kg/day dose for the tree bark presented a higher percentage elimination of v. nana (37.5%), no statistical difference was observed, when compared with the other doses, anatomical parts, the control group and the mebendazole. similarly, no significant difference was observed in the percentage elimination of a. tetraptera. the results suggested the crude extract of the root bark of the a. anthelmia as a promising anthelmintic, requiring further studies, due to the high toxicity presented
Atribui??o dos deslocamentos químicos dos átomos de 1H e 13C do acetato de acantoaustralida
Martins, Lúcia R. Rocha;Cortez, Lúcia E. Ranieri;Dias-Filho, Benedito P.;Nakamura, Celso V.;Ferreira, Ant?nio G.;Cortez, Diógenes A. Garcia;
Revista Brasileira de Farmacognosia , 2006, DOI: 10.1590/S0102-695X2006000400009
Abstract: from the hydroethanolic extract of the aerial parts of acanthospermum australe (asteraceae) a diterpene lactone, acanthoaustralide-1-o-acetate (1) and two flavonoids: quercetin (2) and chrysosplenol d (3) were identified. the structures were determined though the use of spectroscopic techniques such as nmr (1h, 13c{1h}, ghsqc, ghmbc, tocsy, gnoesy), ms and compared with the literature data.
Holt-Oram syndrome revisited. Two patients in the same family
Frota Filho, José Dario;Pereira, Wagner;Leiria, Tiago Luiz Luz;Vallenas, Mario;Le?es, Paulo E.;Blacher, Celso;Lúcio, Eraldo;Lucchese, Fernando A.;
Arquivos Brasileiros de Cardiologia , 1999, DOI: 10.1590/S0066-782X1999001100003
Abstract: holt-oram syndrome was first described in 1960 as an association of familial heart disease and musculoskeletal abnormalities. the most important findings include atrial septal defects, atrioventricular conduction abnormalities, vascular hypoplasia, and upper limb musculoskeletal deformities. we report two patients with this syndrome in the same family and discuss the variability of the musculoskeletal abnormalities and their association with the cardiac morphologic defects. both patients in this study had associated eosinophilia, which has not been reported in the literature.
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