941 resultados para ondas ultrassônicas


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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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We studied in this work some aspects of the physics of sound and music as a tool for physics teaching. The theory of sound since it is generated by some stimulus to its uptake by the human body, in areas such as: frequency, intensity, tone and propagation. The literature of the subject research was combined with the study of free software that captures waves on a computer, using a microphone, and allows to analyze the waves and frequencies involved in the sound, being able to distinguish tones, frequencies and intensities. We have analyzed some instruments (guitar, harmonica and pitch), including voice, from the quantitative and qualitative point of view. Finally we analyze textbooks in their acoustic topics and try to understand how important these materials give to this topic in basic education. We suggest a teaching sequence that could be applied in a high school classroom

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Pós-graduação em Cirurgia Veterinária - FCAV

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

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Pós-graduação em Bases Gerais da Cirurgia - FMB

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Pós-graduação em Física - IFT

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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This work is focused on the subject of air radio navigation systems embedded on aircraft and in the ground stations. Initially is presented a historical context and motivation of the chosen theme. In the following chapters the basics avionics systems are presented, ADF, VOR, DME and ILS such that there is a deepening of electronics theory behind the operation of each system. In this graduate work were presented theories involved in systems such as the definition and creation of radio waves, the frequency spectrum used by each system, the modulation and demodulation of waves, the operating block diagrams of embedded receiver in the aircraft and the terrestrial source station, and the errors involved in the use of each system