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Search Results: 1 - 10 of 603344 matches for " Luiz G. A.;Finzi Neto "
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Architecture of a remote impedance-based structural health monitoring system for aircraft applications
Martins, Luiz G. A.;Finzi Neto, Roberto M.;Steffen Jr., Valder;Palomino, Lizeth V.;Rade, Domingos A.;
Journal of the Brazilian Society of Mechanical Sciences and Engineering , 2012, DOI: 10.1590/S1678-58782012000500008
Abstract: the essence of structural health monitoring (shm) is to develop systems based on nondestructive inspection (ndi) technologies for continuous monitoring, inspection and detection of structural damages. a new architecture of a remote shm system based on electromechanical impedance (emi) measures is described in the present contribution. the proposed environment is employed to automatically monitor the structural integrity of aircrafts and is composed by sensor networks, a signal conditioning system, a data acquisition hardware and a data processing system. the obtained results allow the accomplishment of structural condition-based maintenance strategies, in opposite to those based only on the usage time of the equipment. this approach increases the operational capacity of the structure without compromising the security of the flights. as the environment continually checks for the first signs of damage, possibly reducing or eliminating scheduled aircraft inspections, it could significantly decrease maintenance and repair expenses. furthermore, the usage of this system allows the creation of a historical database of the aircrafts structural integrity, making possible the incremental development of a damage prognosis system (dps). this work presents the proposed architecture and a set of experiments that were conducted in a representative aircraft structure (aircraft window) to demonstrate the effectiveness of the proposed system.
Proteolysis in the Subtropical Woody Tree Anadenanthera colubrina (Angico) Seeds during and after Germination  [PDF]
Douglas Barduche, Kalynka G. do Livramento, Wagner A. S. Judice, Luciano V. Paiva, Luiz Juliano Neto, Renato M. Guimar?es
American Journal of Plant Sciences (AJPS) , 2018, DOI: 10.4236/ajps.2018.96088
Abstract: Proteolysis of seed storage proteins (SSP) during germination provides a steady supply of amino acids to the embryo development into seedling. This process is coordinated by different peptidases that act sequentially and overlaid mode. These enzymes are an ancient group evolved separately in a wide structural and functional diversity and have many applications in medicine, pharmacy and industry. However, the knowledge about seed peptidases during germination was obtained from studies almost restricted to the cultivated species. This restriction implies caution about generalizations made from these studies, as well limits the biological knowledge about plant kingdom and technological use from plant peptidases. In this work, a scan of the proteolytic activity was held in germinating seeds of a leguminous subtropical woody tree. Eleven proteolytic activities were detected in protein extracts from embryonic axis and cotyledons. The presence and intensity of these activities varied over time and between these tissues. There was indication that aspartyl-endopeptidases (phytepsins) and cysteine-carboxypeptidases (plant cathepsins) were involved in A. colubrina SSP hydrolysis. These peptidases differ to that commonly involved in germination of the cultivated leguminous. In addition, one of detected phytepsins showed stability on pH scale, which is important for industrial uses. There was also detected a metallo-carboxypeptidase activity, which has been not described in plants. These peptidases must be isolated to confirm or not these indications. However, these data indicate the biological and technological importance of extending the studies about plant peptidases on a diverse genetic basis.
Propylthiouracil and peripheral neuropathy
Boekel, Valentina Van;Godoy, José Maurício;Lamy, Luiz A.;Assuf, Samira;Meyer Neto, Jo?o G. Corrêa;Balassiano, Salim L.;Prata, Luiz E.;
Arquivos de Neuro-Psiquiatria , 1992, DOI: 10.1590/S0004-282X1992000200021
Abstract: peripheral neuropathy is a rare manifestation in hyperthyroidism. we describe the neurological manifestations of a 38 year old female with graves' disease who developed peripheral neuropathy in the course of her treatment with propylthiouracil. after the drug was tapered off, the neurological signs disappeared. therefore, we call attention for a possible toxic effect on peripheral nervous system caused by this drug.
Insuficiência tricúspide traumática associada a comunica??o interatrial: relato de caso
áVILA NETO, Vicente;ANDRADE, Wanewman G.;BUENO, Ronaldo M.;MELO, Luiz Alberto de;MELO, Ricardo F. A.;
Revista Brasileira de Cirurgia Cardiovascular , 1998, DOI: 10.1590/S0102-76381998000400014
Abstract: the authors describe a case of traumatic tricuspid regurgitation associated to congenital atrial septal defect that presented adverse clinical evolution and has required surgical treatment over a short period.
I programmi sperimentali per gli Istituti Tecnici per geometri
G. Vita Finzi
Aestimum , 1990,
Evaluation of air quality in Volta Redonda, the main metallurgical industrial city in Brazil
Gioda, Adriana;Sales, José A.;Cavalcanti, Paulina M. S.;Maia, Marilza F.;Maia, Luiz F. P. G.;Aquino Neto, Francisco R.;
Journal of the Brazilian Chemical Society , 2004, DOI: 10.1590/S0103-50532004000600012
Abstract: the largest steel plant in brazil is located in volta redonda city, rj. coke production in this kind of industry is the major emission source of aromatic compounds. aiming the implementation of pollution control measures in industries, feema, rio de janeiro state environmental agency, evaluated air quality in that city in dec/95-may/96 and apr-may/99. in the first campaign, total suspended particles (tsp), benzene, toluene, xylenes (btx) and sulfur dioxide (so2) were analyzed and high average concentrations were found 102 μg m-3, 70 μg m-3, 23 μg m-3, 2.5 μg m-3 and 186 μg m-3, respectively. following drastic control measures, the second evaluation (apr-may/99) showed values that dropped to 102 μg m-3 (tsp); 62 μg m-3 (pm10), 23 μg m-3 (b), 4 μg m-3 (t), 0.6 μg m-3 (x), 73 μg m-3 (so2) besides metals. these results, mainly for benzene, indicate that the monitoring program must continue until a final solution for this problem is reached.
Consumo hídrico e coeficiente de cultura da mamoneira na microrregi?o de Lavras, Minas Gerais
Rios, Gervásio F. A.;Carvalho, Luiz G. de;Magina, Flávio de C.;Castro Neto, Pedro;Silva, Bruno M.;Fraga, Ant?nio C.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2011, DOI: 10.1590/S1415-43662011001200009
Abstract: the study was carried out in order to evaluate the evapotranspiration (etc) and crop coefficient (kc) of castor bean by drip irrigation system, under the climatic conditions of lavras, minas gerais state, brazil, from 01/24 to 08/30/2008. the etc was determined by the energy balance according to the bowen ratio method and kc by the methods and recommendations of the fao-56 paper, from 02/14 to 06/03/2008, corresponding to phases i (growth), ii (vegetative), iii (fruiting) and iv (maturity). for this purpose, in the center of the experimental area, the sensors were installed to measure the temperature and relative humidity, at two levels above the crop canopy; the net radiation (rn) and the soil heat flux (g) at 0.08 m under the soil surface. the average etc values in phases i, ii and iii were 2.48, 2.68 and 3.04 mm d-1, respectively. the respective kc in these phases were 0.27, 0.46, 0.87 and 0.57 in maturity phase, within the limits and recommendations of the fao-56 paper.
Similaridade e fatores determinantes na salinidade das águas superficiais do Ceará, por técnicas multivariadas
Palácio, Helba A. Q.;Araújo Neto, José R.;Meireles, Ana C. M.;Andrade, Eunice M.;Santos, Julio C. N.;Chaves, Luiz C. G.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2011, DOI: 10.1590/S1415-43662011000400011
Abstract: multivariate statistical techniques were employed in order to identify the similarity in the salinity levels of the water reservoirs of ceará state, brazil. also, to identify the factors that explain the variability of water quality. the data set used in this investigation came from the company of water management (cogerh). the studied period extended from 1998 to 2009, in a total of 807 samples from 48 different sources. the investigated parameters were: cl-, ca2+, mg2+,na+, hco3 -, ec and sar. the hierarchical cluster analysis identified four groups, being the types and concentrations of the analyzed salts the determining factors. in groups 1 and 2, the salinity level of the water was, mainly, due to the geology and the climate of the region. while for group 3 and 4, besides these factors, the water salinity was influenced by human activities. according to the results, the first and the second components (independent factors) explaining, 57.28 and 26.77%, respectively, the total variance of seven variables. the most important parameters related to the variability of the water salinity level were cl-, ce, na+ and mg2+, which were related to salt solubility.
Seguran?a da abla??o de fibrila??o atrial com RNI terapêutico: compara??o com a transi??o com heparina de baixo peso
Saad, Eduardo B.;Costa, Ieda P.;Costa, Rodrigo E. da;Inácio Jr, Luiz Ant?nio O.;Slater, Charles;Camiletti, Angelina;Moura Neto, Dario G. de;Maldonado, Paulo;Camanho, Luiz Eduardo;Polanczyk, Carisi A.;
Arquivos Brasileiros de Cardiologia , 2011, DOI: 10.1590/S0066-782X2011005000088
Abstract: background: the ideal management of oral anticoagulation (oac) before and after catheter ablation for atrial fibrillation (af) is still controversial. objective: to compare two anticoagulation strategies for catheter ablation for af: warfarin withholding and use of low-molecular-weight heparin (lmwh); and maintenance of warfarin and therapeutic inr (between 2.0 and 3.0). methods: 140 patients (pt) with persistent/permanent af undergoing catheter ablation for af were divided into two groups: group i (70 pt), in which warfarin was withheld five days prior to the procedure and transition to lmwh was used (enoxaparin: 1 mg/kg 2x/day before ablation, and 0.5 mg/kg 2x/day after ablation); group ii (70 pt), in which warfarin was not withheld and the procedure was performed with therapeutic inr. both groups received intravenous heparin (act > 350 seconds) during ablation. results: in group i, one pt (1.4%) had a major hemorrhagic complication and four pts (5.7%) had minor hemorrhagic complications. in group ii, two pts (2.8%) had minor hemorrhagic complications and one pt had a major bleeding, which occurred after using lmwh due to inr < 2.0. none of the groups had thromboembolic complications or cardiovascular death over a period of 16 ± 8 months. conclusion: catheter ablation for af without withholding oac and with therapeutic inr is a strategy that has similar safety and efficacy when compared with the traditional transition to lmwh, avoiding the potentially inadequate anticoagulation of the initial post-ablation period.
An existence result for the sandpile problem on flat tables with walls
G. Crasta,S. Finzi Vita
Mathematics , 2008,
Abstract: We derive an existence result for solutions of a differential system which characterizes the equilibria of a particular model in granular matter theory, the so-called partially open table problem for growing sandpiles. Such result generalizes a recent theorem of Cannarsa and Cardaliaguet established for the totally open table problem. Here, due to the presence of walls at the boundary, the surface flow density at the equilibrium may result no more continuous nor bounded, and its explicit mathematical characterization is obtained by domain decomposition techniques. At the same time we show how these solutions can be numerically computed as stationary solutions of a dynamical two-layer model for growing sandpiles and we present the results of some simulations.
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