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Search Results: 1 - 10 of 188868 matches for " Michele Bernardes de Almeida Ribeiro "
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Formation of TiO2 Nanotube Layer by Anodization of Titanium in Ethylene Glycol-H2O Electrolyte  [PDF]
Alain Robin, Michele Bernardes de Almeida Ribeiro, Jorge Luiz Rosa, Roberto Zenhei Nakazato, Messias Borges Silva
Journal of Surface Engineered Materials and Advanced Technology (JSEMAT) , 2014, DOI: 10.4236/jsemat.2014.43016
Abstract:


In orthopaedics and orthodontics, the growth of nanotubes of titanium oxide on titanium implants is a promising route for improving the osseointegration. Among the fabrication routes to produce nanotubes, anodization was generally preferred due to its simplicity and low cost. TiO2 nanotubes are formed by the simultaneous anodic reaction and chemical dissolution due to the fluoride species present in the anodization bath. In this work, the formation of TiO2 nanotubes was studied in stirred ethylene glycol-H2O electrolyte (90 - 10 v/v) containing NH4F at room temperature. In order to study the effect of NH4F concentration, voltage and anodization time, and to reduce the number of experiments, a design of experiments (DOE) based on a 2k factorial design with four replicates at the center point was used. The analysis of variance (ANOVA) was used to evaluate the effects of the factors of control and their interactions on the percentage of the titanium surface coated by nanotubes. The dimensions of nanotubes (length and diameter) were also evaluated using field emission gun scanning electron microscopy. The cristallinity and phase composition of the oxide layers was investigated by X-ray diffractometry. The electrochemical behavior of as-received and anodized titanium specimens was studied in Ringer’s solution. The statistical analysis showed that fluoride concentration is the most significant factor. The best condition according to the response surface analysis is the center point (1% NH4F, 20 V, 2 h). The nanotubular oxide layers presented an amorphous structure. Electrochemical tests showed that TiO2 nanotubes coated titanium is less corrosion resistant than

Aplica o da terapia assistida (TAA) por animais no tratamento de crian as portadoras de paralisia cerebral - TAA - Parte I
Michele Martins Fosco,Priscila Rodrigues Ribeiro,Fernando Henriques de Almeida Ferraz,Reinaldo de Freitas Junior
Saúde Coletiva , 2009,
Abstract: Este estudio tuvo por objetivo evaluar, a través del cuestionario Inventario de Evaluación Pediátrica de Discapacidad (IEPD), las ganancias motoras que los ni os portadores de Parálisis Cerebrales (PC) obtuvieron con la Fisioterapia Convencional junto a la Terapia Asistida por Animales (TAA) y solamente con la fisioterapia convencional. El análisis de los resultados demuestro mejora expresiva en el ni o que recibió la terapia combinada, particularmente en la dimensión habilidad funcional del IEPD. Concluimos que la TAA puede ser utilizada como una opción de tratamiento de ni os portadores de Parálisis Cerebrales, por tener en cuenta la importancia del lúdico en el desarrollo cognitivo y motor infantil en de correncia de la interacción hombre-animal.
Infleunce of pH on the partition of glucose-6-phosphate dehydrogenase and hexokinase in aqueous two-phase system
Silva, Daniel Pereira da;Pontes, Marcela Zanella Ribeiro;Souza, Maria Aparecida de;Vitolo, Michele;Silva, Jo?o Batista de Almeida e;Pessoa-Junior, Adalberto;
Brazilian Journal of Microbiology , 2002, DOI: 10.1590/S1517-83822002000300002
Abstract: glucose-6-phosphate dehydrogenase (g6pdh) and hexokinase (hk) are important enzymes used in biochemical and medical studies and in several analytical methods. aqueous two-phase system (atps) formed by a polymer solution and an electrolyte solution provides a method for the separation and purification of enzymes with several advantages, including biocompatibility and easy scale up of the process. in this work, the effects of different ph values on the storage stability and partitioning behavior (k, partition coefficient) of the enzymes g6pdh and hk from baker's yeast extract were investigated in atps. the results, obtained from the 17.5% peg 400 : 15.0% phosphate system, showed that when the ph was increased from 5.0 to 8.8, the khk increased 26-fold and the kg6pdh 2.2-fold. in the 20.0% peg 1500 : 17.5% phosphate system, the khk and kg6pdh increased 13 and 1.2-fold, when the ph value was increased from 3.8 to 8.8, respectively. this leads to the conclusion that the partition coefficient for both enzymes is favored by high ph values. a statistical analysis of the results was conducted to confirm this conclusion.
Neural Network in Computer Vision for RoboCup Middle Size League  [PDF]
Paulo Rogério de Almeida Ribeiro, Gil Lopes, Fernando Ribeiro
Journal of Software Engineering and Applications (JSEA) , 2016, DOI: 10.4236/jsea.2016.97022
Abstract: Robot World Cup Initiative (RoboCup) is a worldwide competition proposed to advance research in robotics and artificial intelligence. It has a league called RoboCup soccer devoted for soccer robots, which is a challenge because robots are mobile, fully autonomous, multi-agents, and they play on a dynamic environment. Moreover, robots must recognize the game entities, which is a crucial task during a game. A camera is usually used as an input system to recognize ball, opponents, soccer field, and so on. These elements may be recognized applying some tools of computational intelligence, for example an artificial neural network. This paper describes the application of an artificial neural network on middle size robotic football league, where a multilayer perceptron neural network is trained with the backpropagation algorithm, to classify elements on the image. Each output neuron represents an entity and its output value depends on the current entity that is present on the image. The results show that an artificial neural network successfully classified the entities. They were recognized even when similar color entities were present on the image.
Memory Networks in Tinnitus: A Functional Brain Image Study
Maura Regina Laureano, Ektor Tsuneo Onishi, Rodrigo Affonseca Bressan, Mario Luiz Vieira Castiglioni, Ilza Rosa Batista, Marilia Alves Reis, Michele Vargas Garcia, Adriana Neves de Andrade, Roberta Ribeiro de Almeida, Griselda J. Garrido, Andrea Parolin Jackowski
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0087839
Abstract: Tinnitus is characterized by the perception of sound in the absence of an external auditory stimulus. The network connectivity of auditory and non-auditory brain structures associated with emotion, memory and attention are functionally altered in debilitating tinnitus. Current studies suggest that tinnitus results from neuroplastic changes in the frontal and limbic temporal regions. The objective of this study was to use Single-Photon Emission Computed Tomography (SPECT) to evaluate changes in the cerebral blood flow in tinnitus patients with normal hearing compared with healthy controls. Methods: Twenty tinnitus patients with normal hearing and 17 healthy controls, matched for sex, age and years of education, were subjected to Single Photon Emission Computed Tomography using the radiotracer ethylenedicysteine diethyl ester, labeled with Technetium 99 m (99 mTc-ECD SPECT). The severity of tinnitus was assessed using the “Tinnitus Handicap Inventory” (THI). The images were processed and analyzed using “Statistical Parametric Mapping” (SPM8). Results: A significant increase in cerebral perfusion in the left parahippocampal gyrus (pFWE <0.05) was observed in patients with tinnitus compared with healthy controls. The average total THI score was 50.8+18.24, classified as moderate tinnitus. Conclusion: It was possible to identify significant changes in the limbic system of the brain perfusion in tinnitus patients with normal hearing, suggesting that central mechanisms, not specific to the auditory pathway, are involved in the pathophysiology of symptoms, even in the absence of clinically diagnosed peripheral changes.
The Guarani Aquifer System (Gas) and the Challenges for Its Management  [PDF]
Maria Luísa Telarolli de Almeida Leite, Wagner Costa Ribeiro
Journal of Water Resource and Protection (JWARP) , 2018, DOI: 10.4236/jwarp.2018.1012073
Abstract: It is a huge reserve in South America region and it is considered one of the largest sources of groundwater on the planet. The GAS has strategic value for its countries, especially in a context of increasing scarcity. Its size, its physical and political complexity, as well as its “invisibility” and insufficient treatment in the international scenario, constitute some of the challenging elements for management. The article will, in the first instance, summarize the management cases for transboundary aquifers in the world. Subsequently, a physical and political characterization of the GAS will be made, so that, finally, the existing challenges for the management of this resource will be presented. In order to carry out this work, a bibliographical review of the articles and documents published in recent years concerning the management of transboundary aquifers in the world was carried out, as was done with respect to the Guarani Aquifer and its international framework.
Measuring the Spread Components of Oil and Gas Companies from CDS
Juliano Ribeiro de Almeida,Guilherme Ribeiro de Almeida
Revista Brasileira de Finan?as , 2012,
Abstract: In this paper, we use the information from the credit default swap market to measure the main components of the oil and gas companies spread. Using nearly 20 companies of this industry with different ratings and nearly 80 bonds, the result was that the majority of the oil and gas spread is due to the default risk. We also find that the spread component related to the non-default is strongly associated with some liquidity measures of bond markets, what suggest that liquidity has a very important role in the valuation of fixed income assets. On the other side, we do not find evidence that the non-default component of the spread is related to tax matters.
The New Challenges of Tourism Airports: The Case of Faro Airport
Ribeiro de Almeida,Cláudia;
Tourism & Management Studies , 2011,
Abstract: airport infrastructures play an important role in the heart of the regions in which they are located, as well as in certain sectors of activity, such as tourism. in recent years, their positioning has been altered from a passive attitude to an active attitude due to new market demands and new trends which have arisen in associated sectors, such as the air transport sector. the 1997 deregulation of air transport in europe led to major changes on the way people travel. one of the most interesting results of deregulation, was caused by the fact that the low cost airlines appeared on the market with a business model distinct from the traditional scheduled and charter airlines, allowing for the opening up of new airports and new tourist destinations. those airlines are also responsible for some of the main changes in the airports operations and market positioning. the increase in routes and frequencies offered by these airlines enabled the emergence of new tourist destinations in europe that spread, later on, to other places all over the world. the ease of purchasing an airline ticket online, and the availability of attractive routes at affordable prices allowed the development of new market segments, such as second home tourism. one of the main impacts of low cost operations has been the changing of airport's structures, mainly to the ones that traditionally received charter flights. in this article we are going to explore the case study of faro airport, an excellent example of this changes.
ética e desempenho social das organiza??es: um modelo teórico de análise dos fatores culturais e contextuais
Almeida, Filipe Jorge Ribeiro de;
Revista de Administra??o Contemporanea , 2007, DOI: 10.1590/S1415-65552007000300006
Abstract: the increasing awareness of managers concerning the need for them to respect codes of ethics in their jobs is closely related with their perception that in the long run an ethical posture can result in significant competitive advantages based on a positive external image of the corporation and higher levels of workers' satisfaction and performance. however, the choices managers made when facing ethical dilemas are influenced as well by individual factors, not strategical in nature, that can play an important role in the decision-making process. more than never, understanding these factors is a crucial step to develop a culture that enables ethical social development, and that assures, at the same time, the desirable business sustainability. this study aims to contribute for the debate on corporate ethics, presenting a theoretical model based on hypothesis that explore cultural, moral and contextual factors that can influence socially-based corporate practices.
Neuroconduction examination in patients with HTLV-I associated myelopathy
AFONSO CRISTIANE RIBEIRO DE ALMEIDA
Arquivos de Neuro-Psiquiatria , 2000,
Abstract:
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