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Search Results: 1 - 10 of 31574 matches for " Luiz Gustavo Carneiro "
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The k-Yamabe problem on CR manifolds
Ezequiel Barbosa,Luiz Gustavo Carneiro,Marcos Montenegro
Mathematics , 2012,
Abstract: We introduce the notion of pseudohermitian k-curvature, which is a natural extension of the Webster scalar curvature, on an orientable manifold endowed with a strictly pseudoconvex pseudohermitian structure (referred here as a CR manifold) and raise the k-Yamabe problem on a compact CR manifold. When k=1, the problem was proposed and partially solved by Jerison and Lee for CR manifolds non-locally CR-equivalent to the CR sphere. For k > 1, the problem can be translated in terms of the study of a fully nonlinear equation of type complex k-Hessian. We provide some partial answers related to the CR k-Yamabe problem. We establish that its solutions with null Cotton tensor are critical points of a suitable geometric functional constrained to pseudohermitian structures of unit volume. Thanks to this variational property, we establish a Obata type result for the problem and also compute the infimum of the functional on the CR sphere. Furthermore, we show that this value is an upper bound for the corresponding one on any compact CR manifolds and, assuming the CR Yamabe invariant is positive, we prove that such an upper bound is only attained for compact CR manifolds locally CR-equivalent to the CR sphere. In the Riemannian field, recent advances have been produced in a series of outstanding works.
Forage yield and grazing efficiency on rotationally stocked pastures of 'Tanzania-1' guineagrass and 'Gua u' elephantgrass
Pedreira Carlos Guilherme Silveira,Rosseto Frederico Alberto de Andrade,Silva Sila Carneiro da,Nussio Luiz Gustavo
Scientia Agricola , 2005,
Abstract: The potential carrying capacity of tropical pastures depends not only on the productivity of the forage species and the amount of forage on offer, but also on the efficiency with which the produced herbage is harvested by the grazing animal. This study was conducted to assess the yield and grazing efficiency on 'Gua u' elephantgrass (Pennisetum purpureum Schum.) and 'Tanzania-1' guineagrass (Panicum maximum Jacq.) pastures under rotational stocking. Forage accumulation, daily accumulation rates, grazing losses, bulk density, and utilization efficiency were measured. Treatments (forages) were replicated four times in a completely randomized design. Total forage dry matter (DM) yield over 214 days of grazing were 23850 and 15000 kg ha-1, for the elephantgrass and the guineagrass, respectively, using 250 kg N ha-1 in split applications after each grazing. Mean forage accumulation per grazing cycle was 7950 and 5010 kg ha-1 and mean daily accumulation rates were 137 and 86 kg-1 ha-1 d-1 for P. purpureum and P. maximum, respectively. Grazing losses per cycle averaged 1040 and 880 kg ha-1, for grazing efficiencies of 52 and 37% for the Pennisetum and the Panicum, respectively. Mean seasonal stocking rate was 5.1 AU (animal unit = 500 kg LW) per ha on P. purpureum and 3 AU ha-1 on P. maximum pastures. For both species, productivity potential resides on the high pasture carrying capacity, particularly when there are no soil fertility limitations during the warm/rainy season. Based on growth potential and stem elongation characteristics, 'Gua u' requires better management skills and 'Tanzania-1' has a more pronounced seasonal growth, as expressed by seasonal yields, apparently due to their contrasting responses to temperature and daylength.
Representa es do Ensino, Pesquisa e Interdisciplinaridade dos Cursos de Ciências Contábeis no Estado de Minas Gerais
Denise Carneiro dos Reis Bernardo,Jo?o Paulo de Brito Nascimento,Luiz Gustavo Camarano Nazareth
Contabilidade Vista & Revista , 2010,
Abstract: A preocupa o com a qualidade do ensino contábil no Brasil é um fatoque tem despertado o interesse de pesquisadores e estudiosos da área. S o vários os temas enfatizados, dentre os quais se destacam: aspectos do ensino e aprendizagem, da pesquisa e, em um contexto mais contemporaneo, da rela o interdisciplinar na forma o do profissional de Contabilidade. A pesquisa e as práticas interdisciplinares s o analisadas como elementos vultosos a uma melhor forma o sistêmica, formas de compreender e buscar transformar o todo, de modo a suplantar a dicotomia ensino-pesquisa e, ainda, contribuir no processo de ensino e aprendizagem. Desta forma, o objetivo desta pesquisa foi identificar características relacionadas ao ensino, pesquisa, práticas interdisciplinares e suas inter-rela es nos cursos de Ciências Contábeis do estado de Minas Gerais (MG). Para tanto, foi realizada uma pesquisa de características empírico-exploratórias, por meio de um questionário semi-estruturado. Os dados analisados est o embasados em uma amostra, que foi trabalhada no software Statistical Package for the Social Sciences (SPSS), vers o 12.0. Os resultados demonstraram que, além da predominancia de cursos noturnos e da forte inser o dos discentes no mercado de trabalho – um dos fatores limitantes ao desenvolvimento de pesquisas –. as práticas interdisciplinares têm rela o estreita com a atualiza o das grades curriculares e com as ofertas das disciplinas Controladoria e Contabilidade Internacional.
Craniectomia descompressiva para tratamento da hipertens?o intracraniana traumática em crian?as e adolescentes: análise de sete casos
Faleiro, Rodrigo Moreira;Faleiro, Luiz Carlos Mendes;Oliveira, Marcelo Magaldi;Silva, Tiago;Caetano, Elisa Costa;Gomide, Isabela;Pita, Cristina Carneiro;Lopes, Gustavo;Gusm?o, Sebasti?o;
Arquivos de Neuro-Psiquiatria , 2006, DOI: 10.1590/S0004-282X2006000500024
Abstract: introduction: decompressive craniectomy (dc) is a surgical technique used to treat patients with elevated intracranial pressure often found in head injury. its indication remains a controversial issue in the pediatric population. objective: to report seven cases managed with this technique. method: retrospective study of seven patients, aged from 2 to 17 years, treated with unilateral dc due to increased intracranial pressure (icp) as a consequence of head injury. all patients had icp monitored post operatively and the dc classified as ultra-early (<6h), early (6-12h) or late (>24h) according to the time of its application. the minimum follow-up was six months. results: patients were evaluated with ct scans and clinical exams, and graded according the glasgow outcome scale (gos). three patients deceased (gos1), one was in vegetative state (gos2), two recovered but still requiring nursing care (gos3 and 4), and one had a full recovery (gos5) at hospital discharge. after six months the gos2 and a gos3 patients achieved full recovery (gos5). subdural collection (2), hydrocephalus (1) and superficial infection (1) occurred as complication. two patients had autologous cranioplasty and the other two heterologous cranioplasty. conclusion: decompressive craniectomy remains a feasible treatment method to lower the icp, but is not safe from complications. a multicentric study should be done for appropriate protocol treatment of pediatric patients.
On the Importance of Normalisation Layers in Deep Learning with Piecewise Linear Activation Units
Zhibin Liao,Gustavo Carneiro
Computer Science , 2015,
Abstract: Deep feedforward neural networks with piecewise linear activations are currently producing the state-of-the-art results in several public datasets. The combination of deep learning models and piecewise linear activation functions allows for the estimation of exponentially complex functions with the use of a large number of subnetworks specialized in the classification of similar input examples. During the training process, these subnetworks avoid overfitting with an implicit regularization scheme based on the fact that they must share their parameters with other subnetworks. Using this framework, we have made an empirical observation that can improve even more the performance of such models. We notice that these models assume a balanced initial distribution of data points with respect to the domain of the piecewise linear activation function. If that assumption is violated, then the piecewise linear activation units can degenerate into purely linear activation units, which can result in a significant reduction of their capacity to learn complex functions. Furthermore, as the number of model layers increases, this unbalanced initial distribution makes the model ill-conditioned. Therefore, we propose the introduction of batch normalisation units into deep feedforward neural networks with piecewise linear activations, which drives a more balanced use of these activation units, where each region of the activation function is trained with a relatively large proportion of training samples. Also, this batch normalisation promotes the pre-conditioning of very deep learning models. We show that by introducing maxout and batch normalisation units to the network in network model results in a model that produces classification results that are better than or comparable to the current state of the art in CIFAR-10, CIFAR-100, MNIST, and SVHN datasets.
Competitive Multi-scale Convolution
Zhibin Liao,Gustavo Carneiro
Computer Science , 2015,
Abstract: In this paper, we introduce a new deep convolutional neural network (ConvNet) module that promotes competition among a set of multi-scale convolutional filters. This new module is inspired by the inception module, where we replace the original collaborative pooling stage (consisting of a concatenation of the multi-scale filter outputs) by a competitive pooling represented by a maxout activation unit. This extension has the following two objectives: 1) the selection of the maximum response among the multi-scale filters prevents filter co-adaptation and allows the formation of multiple sub-networks within the same model, which has been shown to facilitate the training of complex learning problems; and 2) the maxout unit reduces the dimensionality of the outputs from the multi-scale filters. We show that the use of our proposed module in typical deep ConvNets produces classification results that are either better than or comparable to the state of the art on the following benchmark datasets: MNIST, CIFAR-10, CIFAR-100 and SVHN.
Publicar mais, ou melhor? O tamanduá olímpico
Rodrigues, Luiz Oswaldo Carneiro;
Psicologia USP , 2011, DOI: 10.1590/S0103-65642011005000014
Abstract: the present text issues some of the research funding institutions criteria used to approve sports science projects, although it seems to be an interesting and common problem to brazilian scientists of another scientific areas. it has been observed that the performed changes in the postgraduate supporting and qualifying system have resulted in a greater brazilian scientific productivity, as shown by its indexed international papers. nevertheless, the institutional pressure for quantitative publishing could be resulting in behavioral distortions of the researchers, which could be harmful to the scientific practice and the science future in brazil. a comparison is made between the anteater and the produced science of brazilians and it seems to be useful to clarify some possible political actions to the sports science scientific community.
An Integrated Approach for Process Control Valves Diagnosis Using Fuzzy Logic  [PDF]
Alvaro Luiz G. Carneiro, Almir C. S. Porto Jr.
World Journal of Nuclear Science and Technology (WJNST) , 2014, DOI: 10.4236/wjnst.2014.43019
Abstract:
Control valves are widely used in industry to control fluid flow in several applications. In nuclear power systems they are crucial for the safe operation of plants. Therefore, the necessity of improvements in monitoring and diagnosis methods started to be of extreme relevance, establishing as main goal of the reliability and readiness of the system components. The main focus of this work is to study the development of a model of non-intrusive monitoring and diagnosis applied to process control valves using artificial intelligence by fuzzy logic technique, contributing to the development of predictive methodologies identifying faults in incipient state. Specially in nuclear power plants, the predictive maintenance contributes to the security factor in order to diagnose in advance the occurrence of a possible failure, preventing severs situations. The control valve analyzed belongs to a steam plant which simulates the secondary circuit of a PWR—Pressurized Water Reactor. The maintenance programs are being implemented based on the ability to diagnose modes of degradation and to take measures to prevent incipient failures, improving plant reliability and reducing maintenance costs. The approach described in this paper represents an alternative departure from the conventional qualitative techniques of system analysis. The methodology used in this project is based on signatures analysis, considering the pressure (psi) in the actuator and the stem displacement (mm) of the valve. Once the measurements baseline of the control valve is taken, it is possible to detect long-term deviations during valve lifetime, detecting in advance valve failures. This study makes use of MATLAB language through the “fuzzy logic toolbox” which uses the method of inference “Mamdani”, acting by fuzzy conjunction, through Triangular Norms (t-norm) and Triangular Conorms (t-conorm). The main goal is to obtain more detailed information contained in the measured data, correlating them to failure situations in the incipient stage.
Quantitative analysis of cardiac lesions in chronic canine chagasic cardiomyopathy
CALIARI, Marcelo Vidigal;MACHADO, Raquel do Pilar;LANA, Marta de;CAJá, Rosangela Aparecida Fran?a;CARNEIRO, Cláudia Martins;BAHIA, Maria Teresinha;SANTOS, César Augusto Bueno dos;MAGALH?ES, Gustavo Albergaria;SAMPAIO, Ivan Barbosa Machado;TAFURI, Washington Luiz;
Revista do Instituto de Medicina Tropical de S?o Paulo , 2002, DOI: 10.1590/S0036-46652002000500008
Abstract: lesions observed in chronic chagasic cardiopathy frequently produce electrocardiographic alterations and affect cardiac function. through a computerized morphometrical analysis we quantified the areas occupied by cardiac muscle, connective and adipose tissues in the right atrium of dogs experimentally infected with trypanosoma cruzi. all of the infected dogs showed chronic myocarditis with variable reduction levels of cardiac muscle, fibrosis and adipose tissue replacement. in the atrial myocardium of dogs infected with be78 and be62 cardiac muscle represented 34 and 50%, fibrosis 28 and 32% and adipose tissue 38 and 18%, respectively. the fibrosis observed was both diffuse and focal and mostly intrafascicular, either partially or completely interrupting the path of muscle bundles. such histological alterations probably contributed to the appearance of electrocardiographic disturbances verified in 10 out 11 dogs which are also common in human chronic chagasic cardiopathy. fibrosis was the most important microscopic occurrence found since it produces rearrangements of collagen fibers in relation to myocardiocytes which causes changes in anatomical physiognomy and mechanical behavior of the myocardium. these abnormalities can contribute to the appearance of cardiac malfunction, arrythmias and congestive cardiac insufficiency as observed in two of the analyzed dogs. strain be78 caused destruction of atrial cardiac muscle higher than that induced by strain be62.
Forage yield and grazing efficiency on rotationally stocked pastures of 'Tanzania-1' guineagrass and 'Gua?u' elephantgrass
Pedreira, Carlos Guilherme Silveira;Rosseto, Frederico Alberto de Andrade;Silva, Sila Carneiro da;Nussio, Luiz Gustavo;Moreno, Leonardo Sim?es de Barros;Lima, Maria Lúcia Pereira;Leme, Paulo Roberto;
Scientia Agricola , 2005, DOI: 10.1590/S0103-90162005000500004
Abstract: the potential carrying capacity of tropical pastures depends not only on the productivity of the forage species and the amount of forage on offer, but also on the efficiency with which the produced herbage is harvested by the grazing animal. this study was conducted to assess the yield and grazing efficiency on 'gua?u' elephantgrass (pennisetum purpureum schum.) and 'tanzania-1' guineagrass (panicum maximum jacq.) pastures under rotational stocking. forage accumulation, daily accumulation rates, grazing losses, bulk density, and utilization efficiency were measured. treatments (forages) were replicated four times in a completely randomized design. total forage dry matter (dm) yield over 214 days of grazing were 23850 and 15000 kg ha-1, for the elephantgrass and the guineagrass, respectively, using 250 kg n ha-1 in split applications after each grazing. mean forage accumulation per grazing cycle was 7950 and 5010 kg ha-1 and mean daily accumulation rates were 137 and 86 kg-1 ha-1 d-1 for p. purpureum and p. maximum, respectively. grazing losses per cycle averaged 1040 and 880 kg ha-1, for grazing efficiencies of 52 and 37% for the pennisetum and the panicum, respectively. mean seasonal stocking rate was 5.1 au (animal unit = 500 kg lw) per ha on p. purpureum and 3 au ha-1 on p. maximum pastures. for both species, productivity potential resides on the high pasture carrying capacity, particularly when there are no soil fertility limitations during the warm/rainy season. based on growth potential and stem elongation characteristics, 'gua?u' requires better management skills and 'tanzania-1' has a more pronounced seasonal growth, as expressed by seasonal yields, apparently due to their contrasting responses to temperature and daylength.
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