Noise Measurement
Mostrando 37-48 de 110 artigos, teses e dissertações.
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37. Evaluation through the mgnetic inspection of the superficial condition of steel bearing rings DIN 100Cr6 after hard and dry turning. / Avaliação através da inspeção magnética da condição superficial de anéis de rolamento de aço DIN 100Cr6 após torneamento duro a seco.
The present work presents information for the manufacturing of ball bearings components with higher limits of resistance to fatigue, enabling a longer useful life and also the optimization of the production of the pieces, making the usual and final process of grinding unnecessary, which would result in a costs reduction. The motivations of this study are the
Publicado em: 2008
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38. Extração de minúcias em imagens de impressões digitais / Extraction minutiae in fingerprints
In this research a method for minutiae extraction in fingerprints images, based on classical approach of image binarization, is presented. The method is composed by three main modules: preprocessing, minutiae detection and post-processing. It was used fingerprint images from FVC2004 database (Fingerprint Verification Competition) that includes synthetic and
Publicado em: 2008
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39. Cerebral perfusion quantification using arterial spin labeling: applications in vascular territories measurement and functional imaging / Quantificação da perfusão sanguínea cerebral utilizando arterial spin labeling: aplicações em medidas de territórios vasculares e em imagens funcionais
Arterial spin labeling techniques allow to obtain quantitative maps of perfusion non-invasively. Along with other MRI techniques, it has proven useful for diagnosis of a variety of cerebrovascular diseases. Amongst the available basic implementations, the continuous approach employing a dedicated labeling RF coil has the advantages of presenting high signal-
Publicado em: 2008
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40. Comparison of face to face and teleconsultation probe microphone measures / Comparação das medidas com microfone sonda realizadas face a face e via teleconsulta
The efficacy of an internet based teleconsultation for hearing aid probe microphone measures in hearing impaired adults was evaluated. The amplitudes of face to face (F) and remote (R) real ear unaided response (REUR), real ear aided response (REAR) and real ear insertion gain (REIG) were compared. The measurement error for repeated measures of REUR, REAR an
Publicado em: 2008
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41. Bone conduction measurements in normal hearing subjects: acoustic radiation and bone vibrator positioning / Medida da condução óssea em sujeitos ouvintes normais: radiação acústica e posicionamento do vibrador ósseo
Clinical audiology literature and practice raise questions about bone conduction assessment results. The most common questions are related to the reliability of bone conduction thresholds as they suffer a lot of artifacts that may mislead the results obtained. Silman &Silverman (1997) describe two important factors that could interfere in such measurement: a
Publicado em: 2008
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42. Medição de impedância utilizando sistemas digitais
Conducting measurements is, in the most part of practical situations, essential for scientific research. It is so important, that it can be said, that all areas in engineering are dependent of it. As well known, impedance measurement is a subject of great interest in many application fields, each of which has different demands in terms of accuracy, range, me
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/06/2007
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43. Study of a 4?(PS)?-? Coincidence System for Absolute Radionuclide Activity Measurement Using Plastic Scintillators / Estudo de um sistema de coincidências 4-pi-beta-gama para a medida absoluta de atividade de radionuclídeos empregando cintiladores plásticos
The present work was intended to study a coincidence system 4?(PS)?-? for absolute activity measurement using plastic scintillators in 4? geometry. Along with experiments on the coincidence system, simulations were also performed applying the Monte Carlo Method, by means of codes PENELOPE and ESQUEMA. These simulations were performed in order to calculate th
Publicado em: 2007
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44. Desempenho acústico das janelas de hospitais localizados em São Paulo / Acoustic performance of the windows of located hospitals in São Paulo.
The noise of transport traffic comes as one of the main problems generated by the intense urbanization of the cities, above all in the great metropolises. In fact, this situation affects considerable portion of the population, causing uncomfortable and reflexes in the physical and mental health condition. The municipal district of São Paulo, that now posses
Publicado em: 2007
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45. Discussão sobre a pressão sonora que acomete o trabalhador da indústria da construção civil
The decision for the building construction industry was due to its dynamics, having diverse areas within a project, many construction workers are involved, and they are exposed to machinery and equipments noise. Machinery noise is the main cause of medical leave and injuries; it can also cause early retirements by the INSS [Brazilian National Institute of So
Publicado em: 2007
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46. Medições de ruído aeronáutico dentro da área II do Plano Específico de Zoneamento de Ruído do Aeroporto Salgado Filho, Porto Alegre, RS / Aircraft noise measurement within Área II of the Specific Noise Zoning Plan for Salgado Filho Airport
Este trabalho expõe e analisa resultados de medições acústicas de aeronaves; realizadas dentro da Área II do Plano Específico de Zoneamento de Ruído- PEZR. O plano restringe o uso do solo em decorrência das emissões sonoras, oriundas da movimentação das aeronaves para cada um dos 66 aeroportos brasileiros administrados pela INFRAERO. As medições
Publicado em: 2007
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47. Modal parameter identification of structures and rotating machine by adaptative filter / Identificação de parametros modais de estruturas e maquinas rotativas atraves da filtragem adaptativa
This work investigates the use of adaptive filters for parameter identification. Although adaptive algorithms are still rarely utilized in the mechanical engineering field, the recursive least square and recursive least square with QR decomposition methods can be implemented based on the second ordinary differential equations in order to characterize the mod
Publicado em: 2007
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48. Uma abordagem livre de modelo para rastreamento de objetos em seqüências de imagens. / A model-free approach for object tracking in sequences of images.
This work proposes an approach to track objects observed in sequences of images. The main objective is the development of an efficient methodology, capable of performing the tracking of one or more heterogeneous targets by using a small amount of a priori information about them. To accomplish this objective we propose a description of the targets free of an
Publicado em: 2007