Java applets for a WWW-HTML-based course in power electronics

This paper introduces Java applet programs for a WWW (world wide web)-HTML (hypertext markup language)-based multimedia course in Power Electronics. The applet programs were developed with the purpose of providing an interactive visual simulation and analysis of idealized uncontrolled single-phase, and three-phase rectifiers. In addition, this paper discusses the development and utilization of JAVA applet programs to solve some design-oriented equations for rectifier applications. The major goal of these proposed JAVA applets was to provide more facilities for the students increase their pace in Power Electronics course, emphasizing waveforms analysis, and providing conditions for an on-line comparative analysis among different hands-on laboratory experiences, via a normal Internet TCP/IP connection. Therefore, using the proposed JAVA applets, which were embedded in a WWW-HTML-based course in Power Electronics, was observed an important improvement of the apprenticeship for the content of this course. Therefore, the course structure becomes fluid, allowing a true on-line course over the WWW, motivating students to learn its content, and apply it in some applications-oriented projects, and their home-works.

Proportional controllers: Direct method for stability analysis and MATLAB implementation

In most cases, the cost of a control system increases based on its complexity. Proportional (P) controller is the simplest and most intuitive structure for the implementation of linear control systems. The difficulty to find the stability range of feedback systems with P controllers, using the Routh-Hurwitz criterion, increases with the order of the plant. For high order plants, the stability range cannot be easily obtained from the investigation of the coefficient signs in the first column of the Routh's array. A direct method for the determination of the stability range is presented. The method is easy to understand, to compute, and to offer the students a better comprehension on this subject. A program in MATLAB language, based on the proposed method, design examples, and class assessments, is provided in order to help the pedagogical issues. The method and the program enable the user to specify a decay rate and also extend to proportional-integral (PI), proportional-derivative (PD), and proportional-integral-derivative (PID) controllers.

Java applets para um software educacional distribuído em eletrônica de potência

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Educational Java applets get in power electronics labs

This paper presents Java applet programs for a WWW (world wide web)-HTML (hypertext markup language)-based multimedia course in basic power electronics circuits. These tools make use of the benefits of Java language to provide a dynamic and interactive approach to simulate steady-state idealized rectifiers (uncontrolled and controlled; single-phase and three-phase). In addition, this paper discusses the development and the use of the Java applet programs to assist the teaching of basics rectifier power electronics circuits, and to serve as a first design tool for basics power electronics circuits in the experiments of the laboratories. In order to validate the developed simulation applets, the results were confronted with results obtained from a well-know simulator package PSPICE. © 2005 IEEE.

As letras como unidades históricas na construção do discurso

This paper proposes we grant graphemes - the constituents of words in situations of discursive constructions - the status of meaning carrying units, in much the same way Vigotski granted the phoneme such status in relation to the spoken word. This paper also seeks to analyze these units in singular manifestations in acts of appropriation of the written language, based on data created by a six-year-old child in a discursive situation. To perform this task, we also referred to Bakhtinian studies on the role of the other in our relation with language. Since the analysis indicated spelling approximations to records found in old Portuguese, historical grammar research of Portuguese was also used. The findings indicate the diversity of reference sources for letter selection by the child, according to its function in the composition of the word.

Histórias de famílias: processos de escrita por alunos de 7ª e 8ª séries do ensino fundamental

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Retórica e argumentatio: uma disputa entre Mem de Sá e Cururupeba

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Proposta de uma estrutura conceitual de modelagem de empresas para implementação do ERP5 baseada na ISO 19440:2007

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Pensando no depois: um estudo sob a perspectiva da gramaticalização

Pós-graduação em Estudos Linguísticos - IBILCE

Previsão espacial de demanda em sistemas de distribuição com uma base reduzida de dados

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Discurso empresarial: o house-organ como instrumento ideológico nas organizações

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Modalizações da gaucherie em autores brasileiros e portugueses contemporâneos

Pós-graduação em Letras - IBILCE

Corrida de orientação: uma proposta metodológica para o ensino da Geografia e da Cartografia

Pós-graduação em Geografia - IGCE

Nominalização e transitividade

This text is part of a larger study that initially aimed at focusing the relation between nominalization and transitivity in the Portuguese Language. Based on A. Culioli´s Theory of the Enuntiative Operations, we started from a static and descriptive analysis of language, in which nominalization and transitivity have visibility, towards a study that takes into consideration the articulation between language and natural languages. This second approach diluted the specificity of these two grammatical questions and directed them to more abstract spaces of reflection and common to any grammatical problem, such as causality, differential propriety and the construction of notional domains.

A oração relativa em português sob a perspectiva discursivofuncional: interface entre a descrição e o ensino

Pós-graduação em Estudos Linguísticos - IBILCE