Metodologia para o cálculo de harmônicas em conversores de potência no sistema HVDC

Pós-graduação em Engenharia Elétrica - FEIS

Concepções infinitesimais em um curso de cálculo

Pós-graduação em Educação Matemática - IGCE

Aspectos conceituais e instrumentais do conhecimento da prática do professor de cálculo diferencial e integral no contexto das tecnologias digitais

Pós-graduação em Educação Matemática - IGCE

Funções, software gráfico e coletivos pensantes

Pós-graduação em Educação Matemática - IGCE

Mensurações do bulbo ocular e cálculo do poder dióptrico de lentes intraoculares em coelhos (Oryctolagus cuniculus), LINNAEUS, 1758)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Uma abordagem pedagógica baseada na análise de modelos para alunos de biologia: qual o papel do software?

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Determinação do fator de rigidez de junta aparafusada em tração utilizando o software Excel

When a bolted joint is loaded in tension with dynamically, part of this load is absorbed by the bolt and rest is absorbed by the joint material. What determines the portion that is to absorbed by the bolt is the joint stiffness factor. This factor influences the tension which corresponds to pre-load and the safety factor for fatigue failure, thus being an important factor in the design of bolted joints. In this work, three methods of calculating the stiffness factor are compared through a spreadsheet in Excel software. The ratio of initial pre-load and the safety factor for fatigue failure depending on the stiffness factor graph is generated. The calculations for each method show results with a small difference. It is therefore recommended that each project case is analyzed, and depending on its conditions and the range of stiffness values, the more or less rigid method about the safety factor for fatigue failure is chosen. In general, the approximation method provides consistent results and can be easily calculated

Determinação da freqüência natural de eixos utilizando o software excel

This work aims to determine the first natural frequency of rotation shaft by using a basic software, Excel, and to compare it to the values obtained in laboratory. When an axle is submitted to a rotation, depending on the rotational frequency used, the axle can enter a state of resonance, in which the amplitude of vibration becomes rather high. The frequencies in which the resonance is observed depends on several parameters of the axle, including the number of concentrated masses associated to the axle. Thus, to obtain a computer program of easy use and access, which can preview the frequency of resonance of an axle in rotation with ‘n’ numbers of concentrated masses it has been studied how the frequency varies with each of these parameters. The computer program and the analyses have been made using the Rayleigh Method, which allowed the transformation of a continuous system to discrete through the theory of finite elements, which has proved that, the bigger the number of divisions of the shaft taken into consideration in the calculus of the natural frequency, the more this value gets close to the real value. The results obtained have been considered satisfactory once these have gotten close to the theoretical results expected

Análise dos métodos de cálculo de golpe de ariete em tubulações

This work studies the most commonly used methods and make comparisons and discussions of the findings made by each of them and the results provided by them. The objective of this research was to show that the method of characteristics is currently the most efficient method to perform these simulations because of its broad scope low simplifications, requirement allowing to consider every detail of the pipe and fluid. Manual calculations are performed and also a software capable of calculating this phenomenon for various situations, such as water pump, elevated tanks, valves and quick maneuver was developed. The software is based on the method of characteristics that is currently recommended by ABNT. These methods, and the results are obtained numerically and graphically are adopted pipes and amount of downstream conditions and in which will be applied. The conclusions reached showed that the Allievi method is widely used yet because of its efficiency and quick calculation for simple pipes. The method of characteristics, although a lot of work to be calculated due to the calculation is iterative process and requires a program to use it, is the only one that allows the calculation with all amount to the conditions situations and downstream of all the pipe possibilities found

Aplicação e análise da utilização do software Eberick em um projeto residencial popular

Due to new technologies in civil engineering and the competition of the market, the demand for computer programs for the elaboration of structural projects of reinforced concrete is raising in a quick and efficient manner. This paper presents a study based on Eberick, a structural calculation software, and this software was applied to a low cost residence project. By performing structural calculation manually, it is possible to compare and analyze the criteria that Eberick uses for the design and detailing of structural elements like columns, beams and slabs. As the software functionality becomes clear, the engineer will use it careful and safely, exploring all of its resources and advantages

Desenvolvimento de uma ferramenta paramétrica em linguagem APDL para o cálculo da estrutura de um pórtico rolante

Pós-graduação em Engenharia Mecânica - FEG

Cálculo diferencial e integral no movimento dos planetas

Pós-graduação em Matemática em Rede Nacional - IBILCE

Introdução a noções de cálculo diferencial e integral no ensino médio no contexto das TIC: implicações para prática do professor que ensina matemática

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Mensurações do bulbo ocular e cálculo do poder dióptrico da lente intraocular em miniporcos brasileiros

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Herramientas para la enseñanza y el aprendizaje de la matemática : Software libre

En este trabajo se presentan cuatro programas que pueden servir como herramientas auxiliares en la enseñanza y aprendizaje de la Matemática. Mediante su utilización, los docentes, pueden innovar en la forma y el diseño de actividades y situaciones didácticas, editar materiales didácticos de distintos tipos, abordar, plantear y resolver problemas geométricos, algebraicos y referidos al análisis de funciones en los entornos dinámicos que brindan estos programas. En general, GeoGebra, Geonext y Regla y Compás son piezas de software libre y de plataformas múltiples que se utilizan en educación para interactuar dinámicamente con la Matemática, en un ámbito en que se reúnen las Geometría, el Algebra y el Cálculo. Los tres son de uso libre y tienen licencia GNU GPL (General Public License). WIRIS es conjunto de productos (comerciales) dedicados al uso y la enseñanza de la Matemática, no sería nuestra intención relevar software que no sea libre sin embargo se tiene acceso gratuito a las herramientas a través de algunos portales educativos gubernamentales en diversos idiomas (el uso está limitado a la condición de estar conectado a Internet). Con WIRIS se dispone de lo que podríamos llamar "súper calculadora" ya que, mediante un conjunto de solapas, ofrece posibilidad de efectuar diversos tipos de cálculos, representar funciones, representar lugares geométricos, programar una secuencia de comandos, etc.