15 results on '"Bittencourt G"'
Search Results
2. Chiral spin-transfer torque induced by curvature gradient
- Author
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Bittencourt, G. H. R., Castro, M., Nunez, A. S., Altbir, D., Allende, S., and Carvalho-Santos, V. L.
- Subjects
Condensed Matter - Mesoscale and Nanoscale Physics - Abstract
This work analyzes the propagation of a transverse domain wall (DW) motion under the action of an electric current along a nanowire (NW) with a curvature gradient. Our results evidence that the curvature gradient induces a chiral spin-transfer torque (CSTT) whose effect on the DW motion depends on the direction along which the DW points. The origin of the CSTT is explained in terms of a position and phase-dependent effective field associated with the DW profile and the electric current direction. Finally, our results reveal that this chiral mechanism can also affect the behavior of other magnetization collective modes, such as spin waves. This work shows the emergence of curvature-induced chiral spin transport and highlights a new phenomenon to be considered for designing spintronic devices., Comment: 7 pages, 3 figures
- Published
- 2023
3. Domain wall damped harmonic oscillations induced by curvature gradients in elliptical magnetic nanowires
- Author
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Bittencourt, G. H. R., Castillo-Sepúlveda, S., Chubykalo-Fesenko, O., Moreno, R., Altbir, D., and Carvalho-Santos, V. L.
- Subjects
Condensed Matter - Mesoscale and Nanoscale Physics - Abstract
Understanding the domain wall (DW) dynamics in magnetic nanowires (NW) is crucial for spintronic-based applications demanding the use of DWs as information carriers. This work focuses on the dynamics of a DW displacing along a bent NW with an elliptical shape under the action of spin-polarized electric currents and external magnetic fields. Our results evidence that a curvature gradient induces an exchange-driven effective tangential field responsible for pinning a DW near the maximum curvature point in a NW. The DW equilibrium position depends on the competition between the torques produced by the external stimuli and the curvature-induced effective fields. When the external stimuli are below a certain threshold, the DW follows a damped harmonic oscillation around the equilibrium position. Above this threshold, DW displaces along the NW under an oscillatory translational motion.
- Published
- 2022
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4. Magnetic Bimerons in Cylindrical Nanotubes
- Author
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Galvez, D., primary, Castro, M., additional, Bittencourt, G. H. R., additional, Carvalho-Santos, V. L., additional, and Allende, S., additional
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- 2023
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- View/download PDF
5. Genotyping of Giardia duodenalis isolates in asymptomatic children attending daycare centre : evidence of high risk for anthroponotic transmission
- Author
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OLIVEIRA-ARBEX, A. P., DAVID, E. B., OLIVEIRA-SEQUEIRA, T. C. G., BITTENCOURT, G. N., and GUIMARÃES, S.
- Published
- 2016
6. Biossegurança: uma visão geral
- Author
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ESTEVES, P. A., CARON, L., RODIGHERI, D. F., BITTENCOURT, G. T. K., SIMAS, A. de, OLIVEIRA, F. M. G. de, PAULO AUGUSTO ESTEVES, CNPSA, LUIZINHO CARON, CNPSA, DANIEL FERNANDO RODIGHERI, IFC/Concórdia, GABRIELA TONIAL KNAPPMANN BITTENCOURT, IFC/Concórdia, ANGELICA DE SIMAS, IFC/Concórdia, and FELIPE MANOEL GIMENEZ DE OLIVEIRA, IFC/Concórdia.
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Sistema de Produção ,Biossegurança ,Avicultura - Abstract
Made available in DSpace on 2020-10-28T09:17:02Z (GMT). No. of bitstreams: 1 final9439.pdf: 1253275 bytes, checksum: 6a87b0fac17e09a3240c15204692e889 (MD5) Previous issue date: 2020
- Published
- 2020
7. Determination of functional compounds in blue shark (Prionace glauca) liver oil obtained by green technology
- Author
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Santos, D. N., primary, Silva, F. S., additional, Verde, A. B., additional, Bittencourt, G. M., additional, and De Oliveira, A. L., additional
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- 2020
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8. Squamous cell carcinoma of the footpad with systemic metastasis in a captive crowned solitary eagle (Buteogallus coronatus)
- Author
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ROCHA, Camila Maria da Silva, primary, WILSON, Tais Meziara, additional, SOUSA, Davi Emanuel Ribeiro de, additional, PEREIRA, Alexandra Ariadne Bittencourt G, additional, LEONARDO, André Santos, additional, NAME, Khesller Patrícia Olazia, additional, and CASTRO, Márcio Botelho de, additional
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- 2020
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9. Genotyping ofGiardia duodenalisisolates in asymptomatic children attending daycare centre: evidence of high risk for anthroponotic transmission
- Author
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OLIVEIRA-ARBEX, A. P., primary, DAVID, E. B., additional, OLIVEIRA-SEQUEIRA, T. C. G., additional, BITTENCOURT, G. N., additional, and GUIMARÃES, S., additional
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- 2015
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10. Possibilistic semantics nets
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Sandri, Sandra Aparecida, Bittencourt, G., Sandri, Sandra Aparecida, and Bittencourt, G.
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We investigate how possibilistic valuations can be introduced in the semantic net formalism. The model proposed here deals with multiple inheritance, exceptions and non-monotonicity by making use of necessity measures attached to the individual links in the net. We also define extensions for this formalism and compare them to other models in the literature., Pages: 318-328
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- 1995
11. Plataform for building agem-based interactive learning environments
- Author
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Pinto, Ig Ibert Bittencourt Santana, Costa, Evandro de Barros, COSTA, E. B., Bittencourt, Guilherme, BITTENCOURT, G., Perkusich, Angelo, PERKUSICH, A., Gutiérrez, María Del Rosario Girardi, and GIRARDI, Rosario
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Artificial intelligence ,Software agents ,Ontology ,Agentes de software ,Framework ,CIENCIAS EXATAS E DA TERRA::CIENCIA DA COMPUTACAO [CNPQ] ,Interactive learning environments ,Ontologia ,Ambientes interativos de aprendizagem - Abstract
This dissertation presents the design and development of an agent-based interactive learning environment based on the Mathema Model. Such model adopts a problem-based learning approach as a pedagogical method that is achieved in an interaction environment that is populated by software and human agents (students and teachers), working together in favour of the human learners. This interaction occurs aiming at helping human learners to solve problems into given knowledge domain. This model aims to help learners during several phases involved in the build solution process, including the problem analysis. With this sense, the interaction between three agent categories was modeled: human learner agent, teacher and artificial tutoring agent. This work proposes a platform for building agent-based interactive learning environments, supporting as framework to developers/software engineers as authoring to non developers users like teachers and knowledge engineers. In addition, the platform has collaborative tools, an ontology-based infrastructure and an agent society that help at the domain modeling and problem solving process (through artificial intelligence techniques). It was conducted two case studies (at legal domain and health domain) and an initial investment at mathematical domain that demonstrate that the proposed platform is feasible. Coordenação de Aperfeiçoamento de Pessoal de Nível Superior O presente trabalho aborda a concepção e desenvolvimento de ambientes interativos de aprendizagem (AIAs) baseados em agentes, mais especificamente, seguindo o modelo de arquitetura multiagente do Mathema. Tal modelo é definido com base em uma estratégia de aprendizagem baseada em problemas, disposta em um cenário onde agentes artificiais e humanos (alunos e professores) interagem com vistas a ajudar aprendizes humanos a resolver problemas em um determinado domínio de conhecimento. Nesse sentido, esse modelo propõe-se a ajudar os aprendizes durante as várias fases para a construção de uma solução, incluindo a análise do problema. Para tanto, modelou-se três categorias de interações: o agente aprendiz humano, o professor e o agente tutor artificial. Neste trabalho, propõe-se uma plataforma para construção de ambientes interativos de aprendizagem baseados em Agentes, dando suporte tanto de um framework, para os engenheiros de software/desenvolvedores, quanto de um sistema de autoria para os usuários não programadores poderem configurar o domínio de ensino. Além disso, tal plataforma possui ferramentas de colaboração, infraestrutura baseada em ontologia e uma sociedade de agentes que auxiliam na modelagem do domínio e resolução de problemas (através de técnicas de Inteligência Artificial). A fim de experimentar e validar a plataforma proposta foram desenvolvidos dois estudos de casos, um na área de direito e o outro em medicina, além de ter sido iniciado um investimento em matemática.
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- 2006
12. Information classification using ontologies
- Author
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Silva, Eunice Palmeira da, Freitas, Frederico Luiz Gonçalves de, FREITAS, F., Costa, Evandro de Barros, COSTA, E. B., Bittencourt, Guilherme, and BITTENCOURT, G.
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Information classification ,Artificial intelligence ,Ontologies ,Inteligência artificial ,Ontologia ,Sistemas multiagentes ,Sistemas de recuperação da informação - Classificação ,CIENCIAS EXATAS E DA TERRA::CIENCIA DA COMPUTACAO::TEORIA DA COMPUTACAO::COMPUTABILIDADE E MODELOS DE COMPUTACAO [CNPQ] - Abstract
Although the positive aspects that Internet possesses and the potential it permits, there is a problematic that consists on finding needed pieces of information among the deluge of available documents on the web. Tools that are able to semantically treat the information contained in the documents which follows a structure only focused on data presentation are still lacking. The MASTER-Web system solves the problem of integrated extraction of content-pages that belong to classes which form a cluster. In this context, we propose the extension of this tool to the scientific articles classification based on ontologies. To achieve this goal, an ontology for the Artificial Intelligence domain was constructed and rule-based classification strategies were adopeted. The approach presented here employs this ontology and textual classification techniques to extract useful pieces of information from the articles in order to infer to which themes it is about. This combination led to significative results: e.g. in the texts, the system is able to identify the specific subdivisions of AI and entails conclusions, distinguishing correctlly the themes of the articles from the ones that are briefiy mentioned in the texts. The application of simple techniques and a detailed ontology lead to promising classification results, independently of the document structure, proposing an eficient and plausible solution. Coordenação de Aperfeiçoamento de Pessoal de Nível Superior Apesar dos aspectos positivos que a Internet possui e do potencial que permite, existe a problemática, que consiste em encontrar a informação necessária em meio a uma enorme quantidade de documentos disponíveis na rede. Faltam, ainda, ferramentas capazes de tratar semanticamente a informação contida em documentos que seguem uma estrutura preocupada apenas com a exibição dos seus dados. O sistema MASTERWeb, resolve o problema da extração integrada de pá¡ginas-conteúdo pertencentes às classes que integram um grupo (cluster ). Neste contexto propomos a extensão dessa ferramenta para a classificação de artigos científicos baseada em ontologias. Para isso foi construída uma ontologia do domínio de Inteligência Artificial e adotadas estratégias de classificação utilizando sistemas de regras. A abordagem apresentada aqui, emprega esta ontologia e técnicas de classificação textual para extrair dos artigos informações úteis, e daí inferir sobre os temas tratados nestes artigos. Essa combinação conduziu a resultados bastante significativos: por exemplo, o sistema é capaz de identificar no texto as subáreas de IA que ele aborda e deriva conclusões, distinguindo os assuntos tratados pelo artigo daqueles que são brevemente citados no texto. A aplicação de técnicas simples e uma ontologia bem formada levam a resultados de classificação promissores, independentemente da estrutura do documento, propondo uma solução eficiente e plausível.
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- 2006
13. Emerging contaminants bioremediation by enzyme and nanozyme-based processes - A review.
- Author
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Amaro Bittencourt G, Vandenberghe LPS, Martínez-Burgos WJ, Valladares-Diestra KK, Murawski de Mello AF, Maske BL, Brar SK, Varjani S, de Melo Pereira GV, and Soccol CR
- Abstract
Due to their widespread occurrence and the inadequate removal efficiencies by conventional wastewater treatment plants, emerging contaminants (ECs) have recently become an issue of great concern. Current ongoing studies have focused on different physical, chemical, and biological methods as strategies to avoid exposing ecosystems to significant long-term risks. Among the different proposed technologies, the enzyme-based processes rise as green biocatalysts with higher efficiency yields and lower generation of toxic by-products. Oxidoreductases and hydrolases are among the most prominent enzymes applied for bioremediation processes. The present work overviews the state of the art of recent advances in enzymatic processes during wastewater treatment of EC, focusing on recent innovations in terms of applied immobilization techniques, genetic engineering tools, and the advent of nanozymes. Future trends in the enzymes immobilization techniques for EC removal were highlighted. Research gaps and recommendations on methods and utility of enzymatic treatment incorporation in conventional wastewater treatment plants were also discussed., (© 2023 The Authors.)
- Published
- 2023
- Full Text
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14. Why not to treat the tooth canal to solve external root resorptions? Here are the principles!
- Author
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Consolaro A and Bittencourt G
- Subjects
- Dental Cementum pathology, Dental Pulp Necrosis surgery, Humans, Root Resorption diagnosis, Root Resorption etiology, Root Resorption pathology, Root Canal Therapy methods, Root Resorption surgery
- Abstract
This paper aims at exposing the foundations or reasons why, in cases of external tooth resorption, including those of orthodontic origin, one should not perform a root canal to treat it. That should be done only to teeth with contamination or pulp necrosis, to remove the periapical inflammation induced by microbial products. When facing cases of external tooth resorption, one's conduct must always respect the following sequence of steps: first of all, identifying the cause accurately; then, planning the therapeutic approach and, finally, adopting the conducts in a very well-founded way. The situations in which endodontic treatment is recommended for tooth resorptions are those when there are: a) pulp necrosis with microbial contamination, b) aseptic pulp necrosis, c) developing calcific metamorphosis of the pulp and d) diagnosis of internal resorption. It is not possible, through the pulp, to control the resorption process that is taking place in the external part, after all, the causes are acting in the periodontal ligament. There is no evidence that justifies applying endodontic treatment, by means of root canal, to control external resorption processes, when the pulp shows vitality.
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- 2016
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- View/download PDF
15. Molecular characterization of intestinal protozoa in two poor communities in the State of São Paulo, Brazil.
- Author
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David ÉB, Guimarães S, de Oliveira AP, Goulart de Oliveira-Sequeira TC, Nogueira Bittencourt G, Moraes Nardi AR, Martins Ribolla PE, Bueno Franco RM, Branco N, Tosini F, Bella A, Pozio E, and Cacciò SM
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- Animals, Asymptomatic Diseases epidemiology, Brazil epidemiology, Carrier State parasitology, Dogs, Feces parasitology, Humans, Intestinal Diseases, Parasitic parasitology, Intestinal Diseases, Parasitic veterinary, Microscopy, Polymerase Chain Reaction, Poverty Areas, Prevalence, Protozoan Infections parasitology, Protozoan Infections, Animal parasitology, Rivers parasitology, Carrier State epidemiology, Intestinal Diseases, Parasitic epidemiology, Protozoan Infections epidemiology
- Abstract
Background: Several species of protozoa cause acute or chronic gastroenteritis in humans, worldwide. The burden of disease is particularly high among children living in developing areas of the world, where transmission is favored by lower hygienic standards and scarce availability of safe water. However, asymptomatic infection and polyparasitism are also commonly observed in poor settings. Here, we investigated the prevalence of intestinal protozoa in two small fishing villages, Porto Said (PS) and Santa Maria da Serra (SM), situated along the river Tietê in the State of São Paolo, Brazil. The villages lack basic public infrastructure and services, such as roads, public water supply, electricity and public health services., Methods: Multiple fecal samples were collected from 88 individuals in PS and from 38 individuals in SM, who were asymptomatic at the time of sampling and had no recent history of diarrheal disease. To gain insights into potential transmission routes, 49 dog fecal samples (38 from PS and 11 from SM) and 28 river water samples were also collected. All samples were tested by microscopy and PCR was used to genotype Giardia duodenalis, Blastocystis sp., Dientamoeba fragilis and Cryptosporidium spp., Results: By molecular methods, the most common human parasite was Blastocystis sp. (prevalence, 45% in PS and 71% in SM), followed by D. fragilis (13.6% in PS, and 18.4% in SM) and G. duodenalis (18.2% in PS and 7.9% in SM); Cryptosporidium spp. were not detected. Sequence analysis revealed large genetic variation among Blastocystis samples, with subtypes (STs) 1 and 3 being predominant, and with the notable absence of ST4. Among G. duodenalis samples, assemblages A and B were detected in humans, whereas assemblages A, C and D were found in dogs. Finally, all D. fragilis samples from humans were genotype 1. A single dog was found infected with Cryptosporidium canis. River water samples were negative for the investigated parasites., Conclusions: This study showed a high carriage of intestinal parasites in asymptomatic individuals from two poor Brazilian villages, and highlighted a large genetic variability of Blastocystis spp. and G. duodenalis.
- Published
- 2015
- Full Text
- View/download PDF
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