Noise Measurement
Mostrando 13-24 de 110 artigos, teses e dissertações.
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13. State estimation of chemical engineering systems tending to multiple solutions
A well-evaluated state covariance matrix avoids error propagation due to divergence issues and, thereby, it is crucial for a successful state estimator design. In this paper we investigate the performance of the state covariance matrices used in three unconstrained Extended Kalman Filter (EKF) formulations and one constrained EKF formulation (CEKF). As bench
Braz. J. Chem. Eng.. Publicado em: 2014-09
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14. Relative Motion Guidance, Navigation and Control for Autonomous Orbital Rendezvous
ABSTRACT: In this paper, the dynamics of the relative motion problem in a perturbed orbital environment are exploited based on Gauss' variational equations. The relative coordinate frame (Hill frame) is studied to describe the relative motion. A linear high fidelity model is developed to describe the relative motion. This model takes into account primary gra
J. Aerosp. Technol. Manag.. Publicado em: 2014-09
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15. Mensuração do ruído em salas de aula: revisão sistemática
OBJETIVOS: Os objetivos desta revisão são elencar as principais metodologias utilizadas para a mensuração do ruído em salas de aula e se os níveis de ruído encontrados estão adequados às normas. MÉTODOS: Realizou-se um levantamento dos artigos publicados nos últimos dez anos, utilizando seis diferentes bases de dados. Foram verificadas 1.088
CoDAS. Publicado em: 2014-04
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16. Filtros digitais por transformadas de Fourier aplicados em eletroquímica
The electrochemical properties of micro and nano-electrodes are widely investigated due to their low faradaic and capacitive currents, leading to a new generation of smart and implantable devices. However, the current signals obtained in low-dimensional devices are strongly influenced by noise sources. In this paper, we show the evaluation of filters based o
Quím. Nova. Publicado em: 2013
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17. As repercussões do ruído ocupacional na audição dos cirurgiões dentistas das Unidades de Saúde da Família de João Pessoa-PB
INTRODUCTION: NIHL (Noise Induced Hearing Loss) is a condition that results from the accumulation of prolonged exposure to noise, causing a slow and progressive hearing impairment, sensorneural, not very deep, but irreversible. The dentist, individuals exposed to noise in their workplace, is susceptible to NIHL. OBJECTIVE: To analyze the auditory and possibl
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/03/2012
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18. Estudo da influência da força de corte em usinagem a verde nas propriedades mecânicas de cerâmicas sinterizadas / Influence of the cutting force of green machining on the mechanical properties of sintered ceramics
The present study deals with the measurement forces of green machining ceramics and their correlation with the mechanical properties after sintering. The green machining is employed in crude compacts either to check raw formats without compromising the extreme dimensional accuracy or to obtain a preform prior to finish machining after sintering, extensively
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/01/2012
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19. New numerical method for the photoelastic technique
The objective of this research is to find new equations for a novel phase-shifting method in digital photoelasticity. Some innovations are proposed. In terms of phase-shifting, only the analyzer is rotated, and the other equations are deduced by applying a new numerical technique instead of the usual algebraic techniques. This approach can be used to calcula
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012-12
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20. AVALIAÇÃO DO RUÍDO DE TRÁFEGO VEICULAR EM ÁREA CENTRAL DE CHAPECÓ SC / EVALUATION OF VEHICULAR TRAFFIC NOISE IN CENTRAL ZONE CHAPECÓ SC
The development of cities and population growth have led, among other urban problems, the increase in sound pressure levels of environmental noise. With the overcrowding of cities, the roads start to host large flows of vehicles, among other sound sources. These factors, coupled with the layout and massing of buildings, make the road a polluter responsible f
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/12/2011
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21. Ruído em sala de parto : mensuração dos níveis e humanização da assistência / Noise in the delivery room : measurement of the levels and humanization of assistance
Objective: To assess the noise level in the delivery room during the birth process in two public hospitals in the state of Sao Paulo, one of them a teaching hospital (H1), considering the type of delivery. Methodology: This is exploratory, descriptive and observational. We used a decibel meter to record the sound pressure in decibels(dB) that remained on dur
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/07/2011
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22. Extensiometria óptica por Moiré geométrico digital para anãlise de tensões no plano / Optical extensometry by digital geometric Moiré for in-plane stress analysis
The study of the behavior of building structures pass through the determination of the strain and stresses to evaluate the level of local and global security against the active actions. In the last years in Brazil, the extensometers have been commonly used to measure the strain at a specific single point. The optical extensometry presents itself as an altern
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/06/2011
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23. Statistical model for the circuit bandwidth dependence of low-frequency noise in deep-submicrometer MOSFETs
This paper covers measurement, analytical analysis, and Monte Carlo simulation of the frequency and bandwidth dependence of MOSFET low-frequency (LF) noise behavior. The model is based on microscopic device physics parameters, which cause statistical variation in the LF noise behavior of individual devices. Analytical equations for the statistical parameters
Publicado em: 2011
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24. Uncertainty calculation for hearing protector noise attenuation measurements by REAT method
The objective of this paper is to quantify the uncertainty of hearing protector attenuation measurements and present the metrology study necessary for the accreditation of the Industrial Noise Laboratory (LARI) at The Federal University of Santa Catarina and Individual Protection Equipment laboratory (LAEPI) of NR consultancy Ltda. - Brazil for hearing prote
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-03