Acoustic Emission
Mostrando 1-12 de 62 artigos, teses e dissertações.
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1. The effectiveness of berberine on noise-induced hearing loss: a rat model
SUMMARY OBJECTIVE: Noise-induced hearing loss is a preventable form of hearing loss that has serious social and economic impacts. This study aimed to investigate the protective effect of berberine, a potent antioxidant and anti-inflammatory agent, against Noise-induced hearing loss. METHODS: After applying distortion product otoacoustic emission, 28 female
Revista da Associação Médica Brasileira. Publicado em: 2022
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2. Damage evaluation and failure mechanism analysis of steel tube confined reinforced-concrete columns by acoustic emission technology
Abstract As a new kind of composite structures and its advantages, the using of steel tube confined reinforced concrete (STCRC) columns have received increasing attention in civil engineering. Acoustic emission (AE) technique is applied to monitor the damage process of STCRC columns during an uniaxial compression test. The aim of this study is to investigate
Lat. Am. j. solids struct.. Publicado em: 29/11/2018
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3. Failure behavior monitoring and evaluation of steel-confined reinforced concrete columns by acoustic emission under quasi-static loading
Abstract The mechanical behavior and failure evolution of steel-confined and unconfined reinforced concrete (RC) columns are investigated under quasi-static loading through acoustic emission (AE) signal. The excellent hysteresis response, lighter damage characteristics and delayed catastrophe of steel-confined RC columns are verified. Characteristic AE param
Lat. Am. j. solids struct.. Publicado em: 01/11/2018
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4. Caracterización de daño por “b-value” de eventos de emisión acústica en ensayos de rotura de roca andesita
ABSTRACT Acoustic emission is a phenomenon that produces elastic waves when materials are subjected to tension. These waves spread towards the material surface where they are received by sensors that convert them into electrical signals for further analysis. In this work, acoustic emission signals were analysed in order to evaluate the amount of accumulated
Matéria (Rio J.). Publicado em: 19/07/2018
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5. Monitoreo mediante Emisión Acústica de vigas de hormigón de alta resistencia con y sin fibras expuesto a alta temperatura
ABSTRACT The addition of fibers to the cementitious matrix, giving rise to fiber-reinforced concrete, aims to improve the low ductility observed in concrete mechanical response under different load scenarios, particularly under direct tension. In this work, cracking and mechanical degradation processes of concrete elements using acoustic emission technique a
Matéria (Rio J.). Publicado em: 19/07/2018
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6. Análisis de la forma de onda de señales de Emisión Acústica producida en ensayos de interfaces ceramo-metálicas
ABSTRACT The study of ceramic-metal interface is of special importance in odontology area by the current demand about dental prostheses, so it is very important to be more and more similar to natural teeth and with a long service life. With the aim of assessing in detail the behavior of ceramic-metal interface used in dental restorations systems, in this wor
Matéria (Rio J.). Publicado em: 19/07/2018
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7. Influence of water in the MQL technique in the grinding of steel AISI 4340 using CBN wheels
Abstract Usually, machining employs cooling methods to avoid high temperatures. In most cases, the cutting fluid is applied with high flow and low pressures. This technique consumes a large amount of cutting fluid that causes serious problems in the environment and in the health of the worker. An alternative to the conventional cooling method is the Minimum
REM, Int. Eng. J.. Publicado em: 2018-07
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8. Peculiar Properties of Phase Transitions in Na0.5Bi0.5TiO3-xBaTiO3 (0
Na0.5Bi0.5TiO3-xBaTiO3 (0
Mat. Res.. Publicado em: 26/02/2018
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9. Acoustic Emission Analysis of Cement Mortar Specimens During Three Point Bending Tests
Abstract This work discusses the experimental results of Acoustic Emission (AE) recordings during repetitive loading/unloading loops of cement mortar beams subjected to three point bending. Six repetitive loading cycles were conducted at a gradually higher load level until the failure of the specimens. The experimental results clearly show the existence and
Lat. Am. j. solids struct.. Publicado em: 2016-12
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10. The audiological profile of adults with and without hypertension
OBJECTIVE: To determine whether there is any influence of systemic arterial hypertension on the peripheral auditory system. METHODS: This was a cross-sectional study that investigated 40 individuals between 30 and 50 years old, who were divided into groups with and without systemic arterial hypertension, using data from high-frequency audiometry, transient
Clinics. Publicado em: 2016-04
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11. Structural damage localisation by acoustic emission technique: A state of the art review
AbstractStructural damages are often associated with under- performance of an engineering system. Hence localisation of such damages, followed by remedial measures, is the key to ensure proper functioning of the structures during their design lives. Acoustic emission (AE) technique is one of the effective non destructive evaluation (NDE) techniques for damag
Lat. Am. j. solids struct.. Publicado em: 2015-08
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12. Utilization of teflon and aluminum oxide for wheel cleaning in Minimum Quantity Lubrication (MQL) grinding
Researches concerning cooling-lubrication optimization in grinding have been conducted to contribute to a more sustainable process. An alternative to flood coolant is minimum quantity lubrication (MQL), which spray oil droplets in a compressed air jet. However, problems related to wheel cleaning were reported, due to wheel loading by a mixture of chips and o
Mat. Res.. Publicado em: 05/11/2013