Electronic And Instrumentation
Mostrando 25-30 de 30 artigos, teses e dissertações.
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25. "Development of the instrumentation and automatic analytical procedures for spectrophotometric determination of surfactants in waters" / "Desenvolvimento de instrumentação e procedimentos analíticos automáticos para a determinação espectrofotométrica de tensoativos em águas"
"In this work, development of the instrumentation and automatic analytical procedures for spectrophotometric determination of surfactants in waters employing the multicommutation concept were proposed. Aiming to system miniaturization, reduction of reagents consumption and effluents generation, solenoids micro-pump and solenoids pinch valves were used for th
Publicado em: 2006
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26. Flow analysis and in situ analysis as aproaches to the improvement of the agronomic samples analytical pathway. / Análise em fluxo e análise in situ como estratégias de melhoramento da seqüência analítica de amostras agronômicas.
The present work discusses the use of alternative approaches for the improvement of the agronomic sample analytical pathway. It was focused on the elimination of the sampling step, with the in situ soil analysis, or in the measurement step with the adoption of flow analysis procedures, with the development of two analytical systems. The first one was employe
Publicado em: 2005
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27. Avaliação clinica da perda de inserção imediata produzida por instrumentos manuais e ultra-sonicos no ato da instrumentação periodontal
The aim of the present study was to clinically detect the trauma from instrumentation caused by scaling and root planing with manual and ultrasonic instruments. Twelve patients, 33 to 65 years old, presenting moderate chronic periodontitis and 3.5 to 6.5 mm periodontal pockets (at least, 3 sites) on anterior (maxillary and/or mandibular) teeth were selected
Publicado em: 2004
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28. AvaliaÃÃo clÃnica da precisÃo de um localizador apical / Clinical evaluation of the accuracy of a electronic apex locator
Esta pesquisa teve como objetivo avaliar In Vivo a PrecisÃo de um localizador apical Novapex (Forum Technologies, Tel Aviv – Israel) que funciona com duas freqÃÃncias dependentes. Foram utilizados 63 incisivos centrais divididos em 3 grupos (A, B and C) respectivamente (polpa viva, polpa necrosada sem reaÃÃo periapical visÃvel radiograficamente e
Publicado em: 2004
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29. Avaliação clinica do trauma de instrumentação produzido pela raspagem e alisamento radicular com diferentes instrumentos
The aim of this study was to clinically quantify trauma from instrumentation produced by scaling and root planing with different instruments. T en subjects with moderate chronic periodontitis were selected. Patients should present a minimum of 5 periodontal pockets, with depths ranging from 3.5 to 6.5 mm, in anterior teeth (upper and/or lower). Qualifying te
Publicado em: 2002
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30. Espectroscopia de luminescencia resolvida no tempo : implementação da tecnica e aplicações
Initially, the optimization of the SR250 Boxcar integrator and averager s parameters for excited-state lifetime measurements was performed. A quantitative theoretical model which takes into account the linear RC time constant distortions on the excited-state lifetime (t) decay waveforms was proposed. The computer simulations using a mathematical expression,
Publicado em: 1992