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Search Results: 1 - 10 of 247699 matches for " Carlos d'Andrade; "
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Implementation of acoustic materials to the VLS-1 Fairing - a sensitivity analysis using SEA
Pirk, Rogerio;Souto, Carlos d'Andrade;
Journal of the Brazilian Society of Mechanical Sciences and Engineering , 2012, DOI: 10.1590/S1678-58782012000100011
Abstract: satellite launchers are submitted to severe acoustic loads mainly during lift-off where spl achieve, at the upper parts, values within the range of 140-160 db. such an excitation can damage embedded elements, if energy attenuation measures are not adopted. in view of managing the plf vibro-acoustic environment, numerical techniques are applied to predict elasto-acoustic behavior. this manuscript presents a numerical study on the design of acoustic insulation for the vls-1 fairing compartment. an excitation profile based on the literature is applied on a sea coupled model of this structural-acoustic system and absorbing materials are added to the model. two parameters of the absorbing material layer are analyzed: thickness and covered area. two nct modeling approaches are used to simulate the effect of blanketing the vls-1 fairing: acoustic materials biot's parameters, given by the manufacturer, and material samples absorption coefficient, measured in a kundt tube. results show that an increase in the blanket thickness from 7.62 to 12.7 cm results in a tl of 1.7 db ospl, while variations of up to 3.0 db ospl are calculated if the fairing cavity blanketed area varies from 30% to 100%.
Slow Plasma Dynamo Driven by Electric Current Helicity in Non-Compact Riemann Surfaces of Negative Curvature  [PDF]
Luiz Carlos Garcia de Andrade
Journal of Modern Physics (JMP) , 2010, DOI: 10.4236/jmp.2010.15046
Abstract: Boozer addressed the role of magnetic helicity in dynamos [1]. He pointed out that the magnetic helicity conservation implies that the dynamo action is more easily attainable if the electric potential varies over the surface of the dynamo. This provided motivated us to investigate dynamos in Riemannian curved surfaces [2]. Thiffeault and Boozer [3] discussed the onset of dissipation in kinematic dynamos. In this paper, when curvature is constant and negative, a simple laminar dynamo solution is obtained on the flow topology of a Poincare disk, whose Gauss curvature is K = –1. By considering a laminar plasma dynamo [4] the electric current helicity λ ≈ 2.34 m–1 for a Reynolds magnetic number of Rm ≈ 210 and a growth rate of magnetic field |γ| ≈ 0.022 are obtained. Negative constant curvature non-compact H2 manifold, has also been used in onecomponent electron 2D plasma by Fantoni and Tellez [5]. Chicone et al. (CMP (1997)) showed fast dynamos can be supported in compact H2. PACS: 47.65.Md.
Rese a de "Bit Literacy Productivity in the Age of Information and E-mail Overload" de Mark Hurst
Carlos Andrade
Academia : Revista Latinoamericana de Administración , 2007,
Pseudo-hemoptise por leishmaniose
Melo, Saulo Maia D'avila;Todt Neto, Jo?o Carlos;Andrade, Leila Caroline Faria de;
Jornal de Pneumologia , 1999, DOI: 10.1590/S0102-35861999000600010
Abstract: a case of larynx mucosa leishmaniasis was initially misdiagnosed with lung tuberculosis, because the first symptom was pseudohemoptysis. the histologic appearance confirmed the diagnosis. the primary location in the larynx is exceptional. it is very important for bronchoscopists to have a broad experience in upper airways to make an exact diagnosis.
Obten??o de piches mesofásicos em dois estágios a partir de piche de petróleo
Dutra, Carlos H. M. C.;Castro, Luiz D. de;Andrade, Cristina T.;
Polímeros , 2008, DOI: 10.1590/S0104-14282008000400009
Abstract: mesophase pitches, precursors of high-performance carbon fibers, were prepared from petroleum pitch by a two-stage heat treatment, in a reactor capable of heat treating 700 g of petroleum pitch under stirring. the process consisted of a pretreatment under pressure at 390, 410 and 430 °c under nitrogen atmosphere, at 0.9 mpa, for three hours, as the first stage, followed by another heat treatment under atmospheric pressure, as the second stage. to study the properties of the petroleum pitch samples, during the experiment, they were removed from the system. quinoline insolubles, toluene insolubles, mesophase content and softening point of the samples were used to follow the pyrolysis process. the results revealed slight variations in the properties for the pitches produced at 390 and 410 °c. however, the pitch samples produced at 430 °c had softening points higher than 300 °c, and mesophase contents of around 70%.
Determina??o da digestibilidade da matéria seca e da proteína bruta do fubá de milho e do farelo de soja para tambaqui (Colossoma macropomum), utilizando-se técnicas com uso de indicadores internos e externos
Vidal Jr., Manuel Vazquez;Donzele, Juarez Lopes;Andrade, Dálcio Ricardo de;Santos, Luiz Carlos dos;
Revista Brasileira de Zootecnia , 2004, DOI: 10.1590/S1516-35982004000900003
Abstract: two experiments were carried out aiming to compare techniques of digestibility of fish food nutrients, by using external indicators (chromic oxide and barium carbonate), internal indicators (hcl-insoluble ash, acid detergent insoluble ash, crude fiber and acid detergent fiber) and the direct determination technique. corn meal was used in the first experiment and soybean meal was used in the second one; both used 100 g tambaquis. chromic oxide and barium carbonate are effective external indicators for estimating the digestibility coefficients of feedstuffs fed to tambaquis. crude fiber and the acid detergent fiber present a low recovery and do not estimate accurately the digestibility coefficients of feedstuffs for tambaquis and also underestimate them. the insoluble ash in acid and the insoluble ash in detergent acid showed high recovery percentage and accurately estimated the digestibility coefficients of feedstuffs fed to tambaquis, when showed contents higher than 3.8 and 3.1, respectively. the direct determination technique was efficient to estimate the digestibility coefficients of the food given to the tambaquis.
Aumento na sobrevida de crian?as de grupos de peso baixo ao nascer em Santa Catarina
Pinheiro,Carlos Eduardo Andrade; Peres,Marco Aurélio; D' Orsi,Eleonora;
Revista de Saúde Pública , 2010, DOI: 10.1590/S0034-89102010005000031
Abstract: objective: to analyze factors associated with survival in the first year of life. methods: a historical cohort study was carried out using data from live birth and mortality information systems, including 90,153 live birth records and 1,053 records of death before age one year in hospitals in the cities of florianópolis and s?o josé, southern brazil, between 1999 and 2006. survival curves were estimated (kaplan-meier) for birthweight categories, date of birth (four-year periods), and type of maternity. proportional hazard ratios for mortality were calculated using cox regression. results: survival (98.8%) did not change among all birthweight categories, but increased among babies born weighing under 2,000 g (77.7% to 81.2%, p=0.029), between 1999-2002 and 2003-2006. there was an increase in the proportion of babies under 2,000 g in the second period. type of hospital was significantly associated with probability of survival. conclusions: probability of survival is higher among babies born in private hospitals and in the teaching hospital in all birthweight categories combined and for babies born weighing under 2,000 g. survival among the latter increased in the most recent period. however, the infant mortality rate did not change between the two periods given the increase in the prevalence of children with ligther birth weight.
Pneumonia necrotizante por Staphylococcus aureus resistente à meticilina
d'Azevedo, Pedro Alves;Inoue, Fernanda Matsiko;Andrade, Soraya Sgambatti;Tranchesi, Regina;Pignatari, Antonio Carlos Campos;
Revista da Sociedade Brasileira de Medicina Tropical , 2009, DOI: 10.1590/S0037-86822009000400020
Abstract: the aim of this study was to describe a case of necrotizing pneumonia caused by methicillin-resistant staphylococcus aureus. the sample was isolated from a blood culture collected less than 48 hours after hospital admission. the patient had been healthy until the infectious process started. the isolate had the meca gene with "staphylococcal cassette chromosome mec" (sccmec) type iva. the possibility that staphylococcus aureus harboring this genetic determinant might be present in our setting should be considered in situations of severe pneumonia within the community.
Hormona del crecimiento y prolactina en líquido amniótico y plasma materno durante el embarazo normal
Hernández-Andrade, Edgar;Villanueva-Díaz, Carlos;Ahued-Ahued, José Roberto;
Revista de investigación clínica , 2005,
Abstract: objective. to measure the concentration of human growth hormone (gh) and prolactin (prl) in maternal plasma (mp) and amniotic fluid (af) during gestation and to evaluate their correlation. methods. hc and prl were measured by radioimmunoassay in 60 healthy women with uncomplicated singleton pregnancies at 16-36 weeks of gestation (wg). trends of both hormones were estimated throughout pregnancy. the correlation of either hormone measured in different fluids was also estimated. results. gh in af (af-gh) decreased significantly throughout pregnancy; (af-gh = 21.32 - 0.54 x wg, r = -0.72 [95% confidence intervals (95% ci) -0.57-0.82], p = 0.001), and increased in mp (mp-gh); (mp-gh = 2.73 +0.11 x wg, r = 0.45 [95% ci, 0.21-0.63]p = 0.05). the correlation between mp-gh and af-gh was, (af-gh = 16.28 - 1.54 x - m-pgh, r = -0.47 [95% ci, -0.64 --0.21]; p = 0.01). prl values did not show significant differences neither in af (af-prl / wg, r = 0.06, p = 0.6) nor in mp (mp-prl / wg, r = 0.25, p = 0.14) during pregnancy, being af-prl (mean 151.3 ng/ml, sd 34.2 ng/ml) significantly higher than mp-prl (mean 119.3 ng/ml, sd 55.4 ng/ml) (p = 0.006) in all the studied period. conclusion. af-gh and mp-gh showed a significant negative correlation during pregnancy. prl measured in af and pm did not show changes throughout gestation being af-prl significantly higher than mp-prl.
Pseudo-hemoptise por leishmaniose
Melo Saulo Maia D'avila,Todt Neto Jo?o Carlos,Andrade Leila Caroline Faria de
Jornal de Pneumologia , 1999,
Abstract: é apresentado caso de leishmaniose tegumentar americana (LTA) acometendo a mucosa da laringe que, dentre as manifesta es clínicas iniciais, apresentou pseudo-hemoptise, levando ao diagnóstico e tratamento err neo de tuberculose pulmonar. A confirma o etiológica foi estabelecida através de estudo histopatológico. A localiza o primária na laringe é relativamente rara. é muito importante a experiência do broncoscopista em vias aéreas superiores para fazer diagnóstico exato.
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