Sound Waves
Mostrando 1-12 de 52 artigos, teses e dissertações.
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1. Simulation of Current Pulses and Sound Waves Resulting from Partial Discharges in a Needle-Plane Geometry in Air
Abstract Partial discharges can occur in different types of electric equipment and cause progressive insulation deterioration, so there is interest in monitoring partial discharges for assessing the state of the isolation of an electric system and to predict failures. Techniques to detect partial discharges, such as detecting ultrasonic emission, have been p
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2022
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2. Masking Level Difference and Electrophysiological Evaluation in Adults with Normal Hearing
Abstract Introduction The auditory structures of the brainstem are involved in binaural interaction, which contributes to sound location and auditory figure-background perception. Objective To investigate the performance of young adults in the masking level difference (MLD) test, brainstem auditory-evoked potentials (BAEPs) with click stimulus, and frequen
Int. Arch. Otorhinolaryngol.. Publicado em: 2020-12
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3. Ab. initio study of the structural, elastic, electronic and optical properties of Cu3N
Electronic, optical, elastic, properties of Copper nitride (Cu3N) in cubic anti- ReO3 phase have been studied using the full-potential augmented plane waves (FP-LAPW) within density functional theory (DFT) framework. Generalized gradient approximation (GGA), local density approximation (LDA), Perdew - Burke - Ernzerhof generalized parameterization of gradien
Mat. Res.. Publicado em: 01/04/2014
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4. Sound localization and occupational noise
OBJECTIVE: The aim of this study was to determine the effects of occupational noise on sound localization in different spatial planes and frequencies among normal hearing firefighters. METHOD: A total of 29 adults with pure-tone hearing thresholds below 25 dB took part in the study. The participants were divided into a group of 19 firefighters exposed to
Clinics. Publicado em: 2014-02
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5. A study on acoustic behavior of poroelastic media bonded between laminated composite panels
A study on the acoustic behavior of double-walled panels, with sandwiched layer of porous materials is presented within Classical Laminated Plate Theory (CLPT) for laminated composite panels. For this purpose, equations of wave propagation are firstly extracted based on Biot's theory for porous materials, then the transmission loss (TL) of the structure is e
Lat. Am. j. solids struct.. Publicado em: 2014
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6. Cortical activity in tinnitus patients and its modification by phonostimulation
OBJECTIVE: The goal of this study was to observe spontaneous cortical activity and cortical activity modulated by tinnitus-matched sound in tinnitus patients and healthy subjects with no otoneurologic symptoms. METHOD: Data were prospectively collected from 50 tinnitus patients and 25 healthy subjects. Cortical activity was recorded in all subjects with e
Clinics. Publicado em: 2013-04
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7. The evaluation of swallowing in patients with spinocerebellar ataxia and oropharyngeal dysphagia: a comparison study of videofluoroscopic and sonar doppler
INTRODUCTION: Spinocerebellar ataxia (SCA) is a degenerative disease that can cause loss of coordination of voluntary muscle movement such as that required for swallowing. AIMS: The purposes of this cross-sectional and comparative case study were: (1) to assess the severity of dysphagia through a videofluoroscopic swallow study, and (2) to compare difference
Int. Arch. Otorhinolaryngol.. Publicado em: 2013-03
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8. Simulação da propagação de ondas ultrassônicas longitudinais em materiais estruturais aeroespaciais / Simulating the propagation of longitudinal ultrasonic waves in aerospace structural materials
The use of composite materials in the aerospace industry is increasing due to its low ratio between density and mechanical strength. To perform non-destructive testing using ultrasound, it is necessary to know the sound velocity in these materials. It is not always possible to manufacture physical prototypes during the development of a project because of tim
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/08/2012
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9. Construcción de una cámara anecoica para la caracterización de la pérdida de transmisión sonora
In this paper a study of the sound transmission loss (PT) in various everyday materials such as styrofoam, cardboard, glass, cotton and sisal is performed. The experimental setup consists of two sound level meters and an absorbing anechoic chamber. It is shown in detail how to build with inexpensive materials the anechoic chamber used to measure the PT. From
Rev. Bras. Ensino Fís.. Publicado em: 2012-12
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10. Novas ondas: o uso do rádio como elemento de mobilização e difusão. Estudo de caso em mídia sonora ligada ao movimento sindical - Jornal Brasil Atual / New Waves: the use of radio as an element of mobilization and diffusion - A case study in media sound linked to the trade union movement - Brazil Current Newspaper (Jornal Brasil Atual)
Esta dissertação se pretende um estudo e reflexão sobre o papel do rádio para mobilização e conscientização de grupos sociais. Focada no movimento sindical, analisará meios e modos de produção do Jornal Brasil Atual, programa de rádio mantido por sindicatos ligados à Central Única dos Trabalhadores (CUT) dentro do Estado de São Paulo, assim co
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/10/2011
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11. Estudo da interação do ultrassom com o tecido cardíaco / Study of the interaction of ultrasound with cardiac tissue
No ultrassom diagnóstico faz-se uso de ondas acústicas de baixa intensidade para investigar os tecidos biológicos, sendo uma técnica não invasiva. Ondas ultrassônicas de maior intensidade podem alterar as características do tecido, e isto é de interesse para aplicações terapêuticas, nas quais a ocorrência de efeitos biológicos é, até certo pon
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/06/2011
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12. Oral and vocal fold diadochokinesis in dysphonic women
The evaluation of oral and vocal fold diadochokinesis (DDK) in individuals with voice disorders may contribute to the understanding of factors that affect the balanced vocal production. Scientific studies that make use of this assessment tool support the knowledge advance of this area, reflecting the development of more appropriate therapeutic planning. Obje
Journal of Applied Oral Science. Publicado em: 2011-12