Estaner ROMÃO FILHO - Academia.edu (original) (raw)

Papers by Estaner ROMÃO FILHO

European Journal of Education and Pedagogy

This research describes a development process of an educommunicational project and its presentati... more This research describes a development process of an educommunicational project and its presentation by 7th year’s students of Middle School. Student’s part of this research was from a private school in a city part of Sao Paulo’s State. In fact, it aimed to verify possible contributions obtained by using a specific didactic sequence linked with Geography teaching. Thereunto, virtual games and educommunication tools were used to promote literacy and scientific dissemination through Digital Information Technologies and Communication. In terms of method utilized, a qualitative-descriptive method was used since it applied observation, analysis, and data comparison to obtain results. In addition, the methodology helped to solve problems throughout the project phase until it reached its final presentation. As a final result of this project, it was observed that students could develop not only active learning but also creative learning throughout the process. As assistance, students had tea...

TANGRAM - Revista de Educação Matemática

Em tempos de ensino remoto, devido à pandemia da Covid-19, os jogos digitais têm desempenhado um ... more Em tempos de ensino remoto, devido à pandemia da Covid-19, os jogos digitais têm desempenhado um papel importante no processo de ressignificação das práticas pedagógicas. Com o objetivo de promover o desenvolvimento de habilidades de raciocínio lógico, por meio do pensamento computacional (PC) utilizando os Jogos de Boole, este trabalho procurou desenvolver nos alunos a competência de resolução de problemas. Trata-se de uma pesquisa-ação, de natureza quanti-qualitativa, desenvolvida em uma escola particular com uma turma de 19 alunos do 4º ano do Ensino Fundamental. Os encontros aconteceram por meio das plataformas Microsoft Teams e Microsoft Forms, de maneira síncrona e assíncrona, respectivamente. No momento síncrono foi aplicado o jogo de Boole, adaptado para a versão digital por meio do programa Power Point. Acompanhando as histórias contendo situações-problema, os alunos tinham que resolver os problemas com as cartas digitalizadas. Para análise e interpretação dos dados foram u...

TANGRAM - Revista de Educação Matemática

É comum observar na cultura escolar uma abordagem de exclusão do erro do aluno, demonstrando apen... more É comum observar na cultura escolar uma abordagem de exclusão do erro do aluno, demonstrando apenas a sua incapacidade em aprender determinado conteúdo. Esta pesquisa foi desenvolvida sob a perspectiva de um estudo de caso visando a compreender a relação entre os erros cometidos pelos alunos e a potencialidade desses erros para uma aprendizagem significativa. O objetivo deste trabalho é, inicialmente, fazer uma reflexão do erro no âmbito escolar, traçando um paralelo com a aprendizagem significativa da matemática para o aluno. Posteriormente, os erros dos estudantes em relação aos tópicos inicias do ensino dos números inteiros negativos serão analisados, visando a aproveitar essas concepções “errôneas” dos educandos no processo de ensino e aprendizagem dessa temática. Os resultados mostram importantes caminhos e considerações que podem, tanto para pesquisadores quanto para professores, aprofundar discussões acerca dessa tendência em Educação Matemática.

International Journal for Innovation Education and Research

The insertion of the individual in the scientific culture goes through scientific literacy and th... more The insertion of the individual in the scientific culture goes through scientific literacy and this, through teaching that privileges research and argumentation in the school scenario, mainly in Science classes. Based on indicators found in the literature that point to scientific literacy and models proposed by Lawson to define the structure of the argument, a table was elaborated to relate the argumentation of children in the second year of elementary school, leveling it in five levels that point to the logical reasoning and the dominion of content, taking into account Wittgenstein's linguistic games. To analyze what level the children were at, a didactic sequence was elaborated that allowed the observation and study of the arguments used by them. Considering such activities and the children's age group, it was observed that they tend not to complete the argumentative sequence, but they already have strong traces of scientific literacy.

In this paper, we will present a didactic and alternative method for correction of harmonic disto... more In this paper, we will present a didactic and alternative method for correction of harmonic distortions in a.c. electric systems. First, the harmonic distortions problem and quantification through the Fourier series will be presented. Then, experimental methods for the correction of distortions will be presented in didactic way aiming to associate basic concepts of physics and mathematical tools to quantify the problem. To measure the harmonic distortion rates, before and after the correction, the FFT (Fast Fourier Transform) spectrum was used, demonstrating its application. The results will demonstrate that experimental activities had as main highlight the reduction of TDH (Harmonic Distortion Rate) from 71% to 11% using only destructive interference.

This paper presents the static and cyclic stresses in combination with fatigue analysis resultant... more This paper presents the static and cyclic stresses in combination with fatigue analysis resultant of loads applied on the friction discs usually utilized on industrial clutches. The material chosen to simulate the friction discs under load is aluminum. The numerical simulation was done by software COMSOL^TM Multiphysics. The results obtained for static loads showed enough stiffness for both geometries and the material utilized. On the other hand, in the fatigue standpoint, failure is clearly verified, what demonstrates the importance of both approaches, mainly dynamical analysis. The results and the conclusion are based on the stresses on disc, counted stress cycles, and fatigue usage factor.

Neste trabalho apresentamos uma breve visao sobre a Educacao Especial e Inclusiva no Brasil a luz... more Neste trabalho apresentamos uma breve visao sobre a Educacao Especial e Inclusiva no Brasil a luz das suas leis, diretrizes e resolucoes, buscando mostrar principalmente um pouco da dificuldade da inclusao de pessoas com deficiencia no sistema escolar. Apresentando o avanco das politicas publicas e a trajetoria percorrida pela luta por inclusao da pessoa com deficiencia em busca de uma educacao igualitaria e acessivel a todos. In this paper we present a brief overview of Special and Inclusive Education in Brazil in the light of its laws, guidelines and resolutions, seeking to show mainly a little of the difficulty of including people with disabilities in the school system. Presenting the advancement of public policies and the trajectory followed by the struggle for inclusion of people with disabilities in search of an equal and accessible education for all. Article visualizations:

This work presents the utilization of a numerical model to determine the hydrodynamic forces acti... more This work presents the utilization of a numerical model to determine the hydrodynamic forces acting on flat wagon floodgates, utilized in the diversion works of Hydroelectric Plants. For this purpose, the commercial software FluentTM was applied satisfactorily. Threedimensional numerical models for various openings of the radial stop log gate were generated, which is ultimately responsible for closing the diversion. The validation of the numerical model was done by comparing data from a reduced physical model, previously studied in laboratory where it was found the correct capture and interpretation of the hydraulic phenomena present – and the numerical model (methodology) applied in similar / derivative works.

Bolema: Boletim de Educação Matemática, 2020

Resumo Novas metodologias de ensino estão sendo utilizadas em sala de aula como forma de propicia... more Resumo Novas metodologias de ensino estão sendo utilizadas em sala de aula como forma de propiciar uma melhor aprendizagem dos conteúdos curriculares. As modificações sociais, econômicas e tecnológicas do mundo contemporâneo, impõem ao sistema educacional, a necessidade de desenvolver novos modelos de ensino e aprendizagem. O presente trabalho teve como objetivo comparar estatisticamente, em duas turmas de alunos, o método de ensino expositivo e a aprendizagem baseada em projetos, concomitantemente ao ensino tradicional. Utilizamos um delineamento experimental tendo como variável independente o método de ensino, e como variáveis independentes, a motivação para aprender, atitudes em relação á Matemática e o desempenho escolar. Os resultados encontrados foram: nos aspectos motivação para aprender e atitudes em relação à Matemática não foram encontradas diferenças significativas entre os métodos de ensino. No aspecto desempenho escolar, uma das turmas no qual se utilizou a aprendizagem...

Revista de Engenharia Térmica, 2008

In this work is presented a numerical solution for temperature profile in two-dimensional diffusi... more In this work is presented a numerical solution for temperature profile in two-dimensional diffusion inside irregular multi-connected geometry. The special discretization has been done by two variants of the finite Element Method: Galerkin Finite Element Method (GFEM) and Least Squares Finite Element Method (LSFEM). Three applications are presented. The first for a regular double connected domain; the second for a regular multi-connected domain and the third application for an irregular multi-connected domain. In all applications are considered Dirichlet boundary conditions. The results obtained in the present work are compared with results from Ansys® simulations. The results of each method are presented and discussed and the characteristics and advantages of the methods are also discussed.

Revista Brasileira de Ensino de Física, 2019

Resumo Neste trabalho será apresentado um método didático e alternativo para correção das distorç... more Resumo Neste trabalho será apresentado um método didático e alternativo para correção das distorções harmônicas em sistemas elétricos de corrente alternada. Primeiramente será apresentado o problema das distorções harmônicas e como quantificá-las através da série de Fourier. Em seguida, métodos experimentais para a correção das distorções serão apresentados de forma didática visando associar conceitos básicos de física e ferramentas matemáticas para quantificação do problema. Para medir as taxas de distorção harmônica, antes e depois da correção, foi utilizado o espectro de FFT (Fast Fourier Transform), demonstrando sua aplicação. Os resultados irão demonstrar que as atividades experimentais tiveram como principal destaque a redução da TDH (Taxa de Distorção Harmônica) de 71% para 11% utilizando apenas interferência destrutiva.

Applied Mechanics and Materials, 2015

This paper aims in particular to do a case study of the numerical efficiency of the application o... more This paper aims in particular to do a case study of the numerical efficiency of the application of LSFEM (Least Squares Finite Element Method) in the solution of heat conduction problems in multi-connected domains. To demonstrate this study two cases (the first with exact solution for comparison of results) are presented in the same multi-connected geometry, of easy construction, to facilitate the comparison of the results of this paper with future studies of other researchers.

International Journal of Mathematics Trends and Technology, 2017

This paper aims to apply the Fourth Order Finite Difference Method to solve the onedimensional Co... more This paper aims to apply the Fourth Order Finite Difference Method to solve the onedimensional Convection-Diffusion equation with energy generation (or sink) in in cylindrical and spherical coordinates.

Applied Mechanics and Materials, 2016

This article discusses, in the case of eccentric orbits, some solution methods for Kepler's e... more This article discusses, in the case of eccentric orbits, some solution methods for Kepler's equation, for instance: Newton's method, Halley method and the solution by Fourire-Bessel expansion. The efficiency of solution methods is evaluated according to the number of iterations that each method needs to lead to a solution within the specified tolerance. The solution using Fourier-Bessel series is not an iterative method, however, it was analyzed the number of terms required to achieve the accuracy of the prescribed solution.

Revista Iberoamericana De Ingenieria Mecanica, 2013

Resumo-Este trabalho tem como objetivo apresentar a aplicação de um esquema de diferenças centrai... more Resumo-Este trabalho tem como objetivo apresentar a aplicação de um esquema de diferenças centrais de O(x 6) na solução da equação de Burgers', demonstrando sua eficiência e facilidade de implementação. A partir de comparações com outros métodos propostos por outros autores, demonstra-se que este método é eficiente tão quanto vários outros, porém, de fácil formulação e implementação além de apresentar um baixo custo computacional.

Mathematical Problems in Engineering, 2014

The Galerkin Finite Element Method (GFEM) with 8- and 27-node hexahedrons elements is used for so... more The Galerkin Finite Element Method (GFEM) with 8- and 27-node hexahedrons elements is used for solving diffusion and transient three-dimensional reaction-diffusion with singularities. Besides analyzing the results from the primary variable (temperature), the finite element approximations were used to find the derivative of the temperature in all three directions. This technique does not provide an order of accuracy compatible with the one found in the temperature solution; thereto, a calculation from the third order finite differences is proposed here, which provide the best results, as demonstrated by the first two applications proposed in this paper. Lastly, the presentation and the discussion of a real application with two cases of boundary conditions with singularities are proposed.

Applied Mathematical Sciences, 2014

This paper deals with two exact solutions of 3D Nonlinear Convection-Diffusion Equation. It is ex... more This paper deals with two exact solutions of 3D Nonlinear Convection-Diffusion Equation. It is expected that these two solutions assist in validation works that use numerical methods for solving nonlinear equations.

European Journal of Education and Pedagogy

This research describes a development process of an educommunicational project and its presentati... more This research describes a development process of an educommunicational project and its presentation by 7th year’s students of Middle School. Student’s part of this research was from a private school in a city part of Sao Paulo’s State. In fact, it aimed to verify possible contributions obtained by using a specific didactic sequence linked with Geography teaching. Thereunto, virtual games and educommunication tools were used to promote literacy and scientific dissemination through Digital Information Technologies and Communication. In terms of method utilized, a qualitative-descriptive method was used since it applied observation, analysis, and data comparison to obtain results. In addition, the methodology helped to solve problems throughout the project phase until it reached its final presentation. As a final result of this project, it was observed that students could develop not only active learning but also creative learning throughout the process. As assistance, students had tea...

TANGRAM - Revista de Educação Matemática

Em tempos de ensino remoto, devido à pandemia da Covid-19, os jogos digitais têm desempenhado um ... more Em tempos de ensino remoto, devido à pandemia da Covid-19, os jogos digitais têm desempenhado um papel importante no processo de ressignificação das práticas pedagógicas. Com o objetivo de promover o desenvolvimento de habilidades de raciocínio lógico, por meio do pensamento computacional (PC) utilizando os Jogos de Boole, este trabalho procurou desenvolver nos alunos a competência de resolução de problemas. Trata-se de uma pesquisa-ação, de natureza quanti-qualitativa, desenvolvida em uma escola particular com uma turma de 19 alunos do 4º ano do Ensino Fundamental. Os encontros aconteceram por meio das plataformas Microsoft Teams e Microsoft Forms, de maneira síncrona e assíncrona, respectivamente. No momento síncrono foi aplicado o jogo de Boole, adaptado para a versão digital por meio do programa Power Point. Acompanhando as histórias contendo situações-problema, os alunos tinham que resolver os problemas com as cartas digitalizadas. Para análise e interpretação dos dados foram u...

TANGRAM - Revista de Educação Matemática

É comum observar na cultura escolar uma abordagem de exclusão do erro do aluno, demonstrando apen... more É comum observar na cultura escolar uma abordagem de exclusão do erro do aluno, demonstrando apenas a sua incapacidade em aprender determinado conteúdo. Esta pesquisa foi desenvolvida sob a perspectiva de um estudo de caso visando a compreender a relação entre os erros cometidos pelos alunos e a potencialidade desses erros para uma aprendizagem significativa. O objetivo deste trabalho é, inicialmente, fazer uma reflexão do erro no âmbito escolar, traçando um paralelo com a aprendizagem significativa da matemática para o aluno. Posteriormente, os erros dos estudantes em relação aos tópicos inicias do ensino dos números inteiros negativos serão analisados, visando a aproveitar essas concepções “errôneas” dos educandos no processo de ensino e aprendizagem dessa temática. Os resultados mostram importantes caminhos e considerações que podem, tanto para pesquisadores quanto para professores, aprofundar discussões acerca dessa tendência em Educação Matemática.

International Journal for Innovation Education and Research

The insertion of the individual in the scientific culture goes through scientific literacy and th... more The insertion of the individual in the scientific culture goes through scientific literacy and this, through teaching that privileges research and argumentation in the school scenario, mainly in Science classes. Based on indicators found in the literature that point to scientific literacy and models proposed by Lawson to define the structure of the argument, a table was elaborated to relate the argumentation of children in the second year of elementary school, leveling it in five levels that point to the logical reasoning and the dominion of content, taking into account Wittgenstein's linguistic games. To analyze what level the children were at, a didactic sequence was elaborated that allowed the observation and study of the arguments used by them. Considering such activities and the children's age group, it was observed that they tend not to complete the argumentative sequence, but they already have strong traces of scientific literacy.

In this paper, we will present a didactic and alternative method for correction of harmonic disto... more In this paper, we will present a didactic and alternative method for correction of harmonic distortions in a.c. electric systems. First, the harmonic distortions problem and quantification through the Fourier series will be presented. Then, experimental methods for the correction of distortions will be presented in didactic way aiming to associate basic concepts of physics and mathematical tools to quantify the problem. To measure the harmonic distortion rates, before and after the correction, the FFT (Fast Fourier Transform) spectrum was used, demonstrating its application. The results will demonstrate that experimental activities had as main highlight the reduction of TDH (Harmonic Distortion Rate) from 71% to 11% using only destructive interference.

This paper presents the static and cyclic stresses in combination with fatigue analysis resultant... more This paper presents the static and cyclic stresses in combination with fatigue analysis resultant of loads applied on the friction discs usually utilized on industrial clutches. The material chosen to simulate the friction discs under load is aluminum. The numerical simulation was done by software COMSOL^TM Multiphysics. The results obtained for static loads showed enough stiffness for both geometries and the material utilized. On the other hand, in the fatigue standpoint, failure is clearly verified, what demonstrates the importance of both approaches, mainly dynamical analysis. The results and the conclusion are based on the stresses on disc, counted stress cycles, and fatigue usage factor.

Neste trabalho apresentamos uma breve visao sobre a Educacao Especial e Inclusiva no Brasil a luz... more Neste trabalho apresentamos uma breve visao sobre a Educacao Especial e Inclusiva no Brasil a luz das suas leis, diretrizes e resolucoes, buscando mostrar principalmente um pouco da dificuldade da inclusao de pessoas com deficiencia no sistema escolar. Apresentando o avanco das politicas publicas e a trajetoria percorrida pela luta por inclusao da pessoa com deficiencia em busca de uma educacao igualitaria e acessivel a todos. In this paper we present a brief overview of Special and Inclusive Education in Brazil in the light of its laws, guidelines and resolutions, seeking to show mainly a little of the difficulty of including people with disabilities in the school system. Presenting the advancement of public policies and the trajectory followed by the struggle for inclusion of people with disabilities in search of an equal and accessible education for all. Article visualizations:

This work presents the utilization of a numerical model to determine the hydrodynamic forces acti... more This work presents the utilization of a numerical model to determine the hydrodynamic forces acting on flat wagon floodgates, utilized in the diversion works of Hydroelectric Plants. For this purpose, the commercial software FluentTM was applied satisfactorily. Threedimensional numerical models for various openings of the radial stop log gate were generated, which is ultimately responsible for closing the diversion. The validation of the numerical model was done by comparing data from a reduced physical model, previously studied in laboratory where it was found the correct capture and interpretation of the hydraulic phenomena present – and the numerical model (methodology) applied in similar / derivative works.

Bolema: Boletim de Educação Matemática, 2020

Resumo Novas metodologias de ensino estão sendo utilizadas em sala de aula como forma de propicia... more Resumo Novas metodologias de ensino estão sendo utilizadas em sala de aula como forma de propiciar uma melhor aprendizagem dos conteúdos curriculares. As modificações sociais, econômicas e tecnológicas do mundo contemporâneo, impõem ao sistema educacional, a necessidade de desenvolver novos modelos de ensino e aprendizagem. O presente trabalho teve como objetivo comparar estatisticamente, em duas turmas de alunos, o método de ensino expositivo e a aprendizagem baseada em projetos, concomitantemente ao ensino tradicional. Utilizamos um delineamento experimental tendo como variável independente o método de ensino, e como variáveis independentes, a motivação para aprender, atitudes em relação á Matemática e o desempenho escolar. Os resultados encontrados foram: nos aspectos motivação para aprender e atitudes em relação à Matemática não foram encontradas diferenças significativas entre os métodos de ensino. No aspecto desempenho escolar, uma das turmas no qual se utilizou a aprendizagem...

Revista de Engenharia Térmica, 2008

In this work is presented a numerical solution for temperature profile in two-dimensional diffusi... more In this work is presented a numerical solution for temperature profile in two-dimensional diffusion inside irregular multi-connected geometry. The special discretization has been done by two variants of the finite Element Method: Galerkin Finite Element Method (GFEM) and Least Squares Finite Element Method (LSFEM). Three applications are presented. The first for a regular double connected domain; the second for a regular multi-connected domain and the third application for an irregular multi-connected domain. In all applications are considered Dirichlet boundary conditions. The results obtained in the present work are compared with results from Ansys® simulations. The results of each method are presented and discussed and the characteristics and advantages of the methods are also discussed.

Revista Brasileira de Ensino de Física, 2019

Resumo Neste trabalho será apresentado um método didático e alternativo para correção das distorç... more Resumo Neste trabalho será apresentado um método didático e alternativo para correção das distorções harmônicas em sistemas elétricos de corrente alternada. Primeiramente será apresentado o problema das distorções harmônicas e como quantificá-las através da série de Fourier. Em seguida, métodos experimentais para a correção das distorções serão apresentados de forma didática visando associar conceitos básicos de física e ferramentas matemáticas para quantificação do problema. Para medir as taxas de distorção harmônica, antes e depois da correção, foi utilizado o espectro de FFT (Fast Fourier Transform), demonstrando sua aplicação. Os resultados irão demonstrar que as atividades experimentais tiveram como principal destaque a redução da TDH (Taxa de Distorção Harmônica) de 71% para 11% utilizando apenas interferência destrutiva.

Applied Mechanics and Materials, 2015

This paper aims in particular to do a case study of the numerical efficiency of the application o... more This paper aims in particular to do a case study of the numerical efficiency of the application of LSFEM (Least Squares Finite Element Method) in the solution of heat conduction problems in multi-connected domains. To demonstrate this study two cases (the first with exact solution for comparison of results) are presented in the same multi-connected geometry, of easy construction, to facilitate the comparison of the results of this paper with future studies of other researchers.

International Journal of Mathematics Trends and Technology, 2017

This paper aims to apply the Fourth Order Finite Difference Method to solve the onedimensional Co... more This paper aims to apply the Fourth Order Finite Difference Method to solve the onedimensional Convection-Diffusion equation with energy generation (or sink) in in cylindrical and spherical coordinates.

Applied Mechanics and Materials, 2016

This article discusses, in the case of eccentric orbits, some solution methods for Kepler's e... more This article discusses, in the case of eccentric orbits, some solution methods for Kepler's equation, for instance: Newton's method, Halley method and the solution by Fourire-Bessel expansion. The efficiency of solution methods is evaluated according to the number of iterations that each method needs to lead to a solution within the specified tolerance. The solution using Fourier-Bessel series is not an iterative method, however, it was analyzed the number of terms required to achieve the accuracy of the prescribed solution.

Revista Iberoamericana De Ingenieria Mecanica, 2013

Resumo-Este trabalho tem como objetivo apresentar a aplicação de um esquema de diferenças centrai... more Resumo-Este trabalho tem como objetivo apresentar a aplicação de um esquema de diferenças centrais de O(x 6) na solução da equação de Burgers', demonstrando sua eficiência e facilidade de implementação. A partir de comparações com outros métodos propostos por outros autores, demonstra-se que este método é eficiente tão quanto vários outros, porém, de fácil formulação e implementação além de apresentar um baixo custo computacional.

Mathematical Problems in Engineering, 2014

The Galerkin Finite Element Method (GFEM) with 8- and 27-node hexahedrons elements is used for so... more The Galerkin Finite Element Method (GFEM) with 8- and 27-node hexahedrons elements is used for solving diffusion and transient three-dimensional reaction-diffusion with singularities. Besides analyzing the results from the primary variable (temperature), the finite element approximations were used to find the derivative of the temperature in all three directions. This technique does not provide an order of accuracy compatible with the one found in the temperature solution; thereto, a calculation from the third order finite differences is proposed here, which provide the best results, as demonstrated by the first two applications proposed in this paper. Lastly, the presentation and the discussion of a real application with two cases of boundary conditions with singularities are proposed.

Applied Mathematical Sciences, 2014

This paper deals with two exact solutions of 3D Nonlinear Convection-Diffusion Equation. It is ex... more This paper deals with two exact solutions of 3D Nonlinear Convection-Diffusion Equation. It is expected that these two solutions assist in validation works that use numerical methods for solving nonlinear equations.