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Search Results: 1 - 10 of 5587 matches for " Erlon;Nunes "
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Compara??o entre os volumes pulmonares irradiados com técnica bidimensional e tridimensional conformada na radioterapia de pacientes com tumores de pulm?o localmente avan?ados
Carvalho, Heloisa de Andrade;Sales, Camila Pessoa de;Stuart, Silvia Radwanski;Gil, Erlon;Nunes, André Costa Navega;Ferauche, Debora Cartelle;
Radiologia Brasileira , 2009, DOI: 10.1590/S0100-39842009000500009
Abstract: objective: to compare and quantify irradiated lung volumes using two-dimensional (2d) and three-dimensional (3d) conformal planning for radiotherapy in the treatment of lung cancer. materials and methods: 2d and 3d conformal radiotherapy plannings were performed for 27 patients with lung cancer. prescribed doses ranged from 45 to 66 gy. the analysis covered the doses to planning target volume (ptv), gross tumor volume (gtv) and lungs (lung volume receiving 20 gy or 30 gy - v20 and v30, respectively, and mean dose). the doses to adjacent organs at risk (spinal cord, esophagus and heart) were maintained below the tolerance limits. results: gtv ranged from 10.5 to 1,290.0 cm3 (mean, 189.65 cm3). on average, a total of 59.33 fields were utilized in the 2d planning and 75.65 fields in the 3d planning. lung volumes were significantly preserved (p < 0.05) with the 3d conformal planning in all the evaluated cases, with about 15% decrease in the irradiated lung volumes. lungs without tumor were most benefited from this technique. conclusion: 3d radiotherapy allowed a better sparing of the lungs, both in cases of early and advanced tumors. 3d radiotherapy should be used in the treatment of patients with lung cancer, even in cases of large tumors.
Bioquímica da esquistossomose mans?nica: VII. Altera??es lipídicas das membranas lisoss?micas durante a faze inicial da agress?o hepática
Rodrigues, Luiz Erlon Araújo;
Memórias do Instituto Oswaldo Cruz , 1988, DOI: 10.1590/S0074-02761988000100007
Abstract: aiming at investigating the changes on the lipidic constitution of hepatic lysosomal membranes at the initial phase of schistosomotic damage, mice have been infected with 30 cercarias and employed for essais in the 30th day if infection. the triacyglycerois decreased from 220 ± 48 μg/mg of total proteins in the control mice, to 165 ± 22μg/mg in the infected ones. similarily, the free cholesterol, also decreased from 539 ± 80 to 396 ± 54 μg/mg; the cholesterol esters from 270 ± 35 to 216 ± 36 μg/mg and the phosphatidylcholines from 44 ± 5,7 to 31 ± 4,9 μg/mg. the phosphatidylserines the phosphatidylethanolamines and the sphingomyelines increased, respectively from 58 ± 9,7 to 60 ± 8,5, from 72 ± 7,8 to 111 ± 15,7 and from 36 ± 4,9 to 63 ± 7,1 μg/mg. the free fatty acids showed no statistical significance on their variations. they varied from 1,7 ± 0,25 μeq/g in the controls to 1,8 ± 0,39 eq/g in the infected animals. these results indicated that in the initial phase of hepatic schistosomiasis, before the formation of granulomas, important changes on the lipidic constitution of lysosomal membranes can be detected. it seems that they are provoked by the catabolic excreted by immature or adult worms of schistosoma mansoni present in the portal vein system.
Valva aórtica quadrivalvular por ecocardiografia transtorácica
Silva, Erlon Oliveira de Abreu;Iglesias, Alessandro Giralde;Silva, Erlon de Abreu;
Arquivos Brasileiros de Cardiologia , 2008, DOI: 10.1590/S0066-782X2008001400014
Abstract: a 55-year-old woman seeks medical attention with palpitations, atypical chest pain and dyspnea upon exertion, lasting for 12 months. ecg showed left ventricular hypertrophy. transthoracic doppler echocardiogram confirmed hypertrophy of the left chambers and showed a quadricuspid aortic valve, with equal-sized cusps, in addition to a moderate regurgitant central flow. upon echocardiography, the quadricuspid valve is identified by its characteristic "x" form during diastole and rectangular aspect during systole. heart failure symptoms are presumably caused by valve insufficiency due to abnormal leaflet coaptation. considering the possibility of progressive regurgitation, follow up on the patient was performed with periodic echocardiographic control. symptoms responded to treatment.
The lysosomal stability as a biomarker for the determination of pollution in aquatic environments
Nazar, Maria Loreto;Rodrigues, Luiz Erlon Araujo;Nascimento, Iracema;
Brazilian Archives of Biology and Technology , 2008, DOI: 10.1590/S1516-89132008000500025
Abstract: this work studied the effects caused by five different formulae of gasoline on the stability of the lysosomes isolated from the liver of the tilapia fish (oreochromis niloticus). the functional integrity of the lysosomal membranes was evaluated via the acid phosphatase activity. the results showed that there were significant changes in the stability of the lysosomes exposed to the presence of the hydrocarbons in the environment. therefore, considering the method's simplicity, the sensitivity of the responses and its low cost the assessment of the lysosomal activity could be an important tool for the study of the effects of pollution in the aquatic environments.
Quantifica??o das substancias fenólicas totais em órg?os da aroeira Schinus Terebenthifolius (RADDI)
Queires, Luís Carlos Soares;Rodrigues, Luiz Erlon Araujo;
Brazilian Archives of Biology and Technology , 1998, DOI: 10.1590/S1516-89131998000200012
Abstract: the "aroeira" (schinus terebenthifolius, raddi), known as a toxic plant is actually very used in popular medicine, mainly in the treatment of general inflammatory processes. many of its properties or of its curative effects may be attributed to the different polyphenols that belong to its structural constitution. in this work we have demonstrated that the distribution of total phenols was different in the several organs of the "aroeira", such as leaves, flowers, fruits and stem. the importance of these substances for the plant physiology and defense mechanisms, their ecological relationships and some therapeutic uses were also discussed. the correlation between the polyphenol properties and the metabolism of animal cells, suggest special attention when the infusions or hydroalcoholic extracts, obtained from that plant, are used in humans.
Solving the unit commitment problem of hydropower plants via Lagrangian Relaxation and Sequential Quadratic Programming
Finardi, Erlon C.;Silva, Edson L. da;Sagastizábal, Claudia;
Computational & Applied Mathematics , 2005, DOI: 10.1590/S0101-82052005000300001
Abstract: we consider the optimal scheduling of hydropower plants in a hydrothermal interconnected system. this problem, of outmost importance for large-scale power systems with a high proportion of hydraulic generation, requires a detailed description of the so-called hydro unit production function. in our model, we relate the amount of generated hydropower to nonlinear tailrace levels; we also take into account hydraulic losses, turbine-generator efficiencies, as well as multiple 0-1 states associated with forbidden operation zones. forbidden zones are crucial to avoid nasty phenomena such as mechanical vibrations in the turbine, cavitation, and low efficiency levels. the minimization of operating costs subject to such detailed constraints results in a large-scale mixed-integer nonlinear programming problem. by means of lagrangian relaxation, the original problem is split into a sequence of smaller and easy-to-solve subproblems, coordinated by a dual master program. in order to deal better with the combinatorial aspect introduced by the forbidden zones, we derive three different decomposition strategies, applicable to various configurations of hydro plants (with few or many units, which can be identical or different). we use a sequential quadratic programming algorithm to solve nonlinear subproblems. we assess our approach on a real-life hydroelectric configuration extracted from the south sub region of the brazilian hydrothermal power system.
Aloca??o de unidades hidrelétricas no problema da programa??o da opera??o energética utilizando relaxa??o lagrangeana e lagrangeano aumentado
Rodrigues, Rafael N.;Finardi, Erlon C.;Silva, Edson L. da;
Sba: Controle & Automa??o Sociedade Brasileira de Automatica , 2006, DOI: 10.1590/S0103-17592006000200004
Abstract: the short-term operation planning problem aims to define the generation units should operate at minimum cost to fully supply the demand while meeting the system constraints over the study horizon. the problem is of a non-linear, integer-mixed, large scale optimization type, whose solution is a rather challenging task. this paper uses the lagrangian relaxation to decompose the original problem into simpler subproblems to be solved in sequence. in this decomposition, the subproblems are constructed taking advantage of their specific characteristics. one of the resulting subproblems of the relaxation scheme refers to the commitment of hydroelectric units. in order to solve this problem, an algorithm for exhaustive enumeration is proposed. this algorithm makes use of the augmented lagrangean method, which solves the resulting constrained nonlinear subproblems for each examined state. a quasi-newton method is used for the solution of the unconstrained subproblems resulting from the application of the augmented langrangean method. the proposed model is applied to two hydroelectric units of the brazilian power system, demonstrating its consistency and practical feasibility.
Qualidade da água de córrego em fun o do lan amento de efluente de abate de bovino Water quality of stream due to release of effluent from cattle slaughter
Erlon A. Ribeiro,Delvio Sandri,Josianny A. Boêno
Revista Brasileira de Engenharia Agrícola e Ambiental , 2013,
Abstract: Objetivou-se, com este trabalho, avaliar a influência do lan amento de efluente de um frigorífico de abate de bovinos sobre a qualidade da água do córrego Jurubatuba, Anápolis, GO. Analisaram-se: o efluente tratado antes do lan amento no córrego e a água do córrego 50 m à montante e 50 e 500 m à jusante do ponto de lan amento. Foram realizadas oito coletas no período seco (08/07 a 24/09/09) e oito no chuvoso (01/10 a 03/12/09) quantificando o pH, turbidez, oxigênio dissolvido, satura o de oxigênio, carbono organico total, cloro, alumínio, am nia, cobre, manganês, ferro total, fósforo total, sulfeto, sódio, demanda biológica de oxigênio, demanda química de oxigênio, nitrogênio total, condutividade elétrica, nitrato e nitrito. Os valores de pH, NH3-, Zn+, sulfeto, NO3-, e cloreto nos dois períodos e em todos os pontos analisados no córrego, atenderam aos critérios para água de classe 2; o Na+, NH3-, carbono organico total, P total, CE e NO3-, aumentaram nos pontos após o lan amento do efluente. A turbidez, Al e o Mg no efluente tratado foram, nos períodos seco e chuvoso, maiores ao permitido para corpos hídricos de classe 2; o Fe total no efluente apresentou risco médio para uso na irriga o. The objective of this study was to evaluate the influence of release of effluent from a cattle slaughter house on water quality of Jurubatuba stream, in Anápolis - Goiás. The treated effluent before release into the stream, the stream water at 50 m upstream, and 50 and 500 m downstream from the launch place were analysed. Eight samples were taken during the dry season (08/07 to 24/09/2009) and eight in the rainy season (01/10 to 03/12/2009), quantifying pH, turbidity, dissolved oxygen, oxygen saturation, total organic carbon, chlorine, aluminum, ammonia, copper, manganese, total iron, total phosphorus, sulfate, sodium, biological oxygen demand, chemical oxygen demand, total nitrogen, electrical conductivity, nitrate and nitrite. The values of pH, NH-3, Zn++, sulfide, NO3, chloride during the two periods at all analyzed points matched the criteria of water of class 2. Na+, NH3, total organic carbon, total P, CE and NO3 increase at some points after the release of the effluent. Turbidity, Al and Mg in the treated effluent during dry and rainy season were higher than allowed for class 2 water bodies; total Fe in the effluent had medium risk for use in irrigation.
Solving the unit commitment problem of hydropower plants via Lagrangian Relaxation and Sequential Quadratic Programming
Erlon C. Finardi,Edson L. da Silva,Claudia Sagastizábal
Computational and Applied Mathematics , 2005,
Abstract: We consider the optimal scheduling of hydropower plants in a hydrothermal interconnected system. This problem, of outmost importance for large-scale power systems with a high proportion of hydraulic generation, requires a detailed description of the so-called hydro unit production function. In our model, we relate the amount of generated hydropower to nonlinear tailrace levels; we also take into account hydraulic losses, turbine-generator efficiencies, as well as multiple 0-1 states associated with forbidden operation zones. Forbidden zones are crucial to avoid nasty phenomena such as mechanical vibrations in the turbine, cavitation, and low efficiency levels. The minimization of operating costs subject to such detailed constraints results in a large-scale mixed-integer nonlinear programming problem. By means of Lagrangian Relaxation, the original problem is split into a sequence of smaller and easy-to-solve subproblems, coordinated by a dual master program. In order to deal better with the combinatorial aspect introduced by the forbidden zones, we derive three different decomposition strategies, applicable to various configurations of hydro plants (with few or many units, which can be identical or different). We use a Sequential Quadratic Programming algorithm to solve nonlinear subproblems. We assess our approach on a real-life hydroelectric configuration extracted from the south sub region of the Brazilian hydrothermal power system.
A New Governance Model for Independent Regulatory Agencies  [PDF]
Rui Nunes, Sofia B. Nunes, Guilhermina Rego
Theoretical Economics Letters (TEL) , 2015, DOI: 10.4236/tel.2015.51002
Abstract: In a regulatory state the purpose of intervention by any Independent Regulatory Agency (IRA) is not only regulation in the strict sense but also the supervision of the activity of institutions providing a specific service, particularly the utilities. However, given the evolution of most market economies, namely in transition countries, it is necessary to design new governance arrangements that enable an effective, transparent and truly independent intervention of IRAs. The objectives of this study are a) to analyse of the institutional-design chosen for some independent regulatory agencies and its regulatory framework, namely in northern economies, and b) to suggest the need to strengthen governance arrangements to effectively guarantee regulatory independence, transparency and accountability, therefore promoting a true sunshine regulation in southern economies. The authors conclude that strengthening accountability arrangements is the most important mechanism to avoid regulators capture from the government and regulated organisations. It is also concluded that the way regulators have chosen can also influence the way IRA conducts its activity. Therefore, it is suggested that board accountability can be enhanced by the generalization of the principle of the public contest of regulators.
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