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Secretion of middle ear in infants - Occurrence, recurrence and related factors
(2005-03-01)
Objective: The present study aimed at evaluating the occurrence and recurrence of middle ear effusion and possible associated factors in the first two years of life of 190 newborns and infants, participants in the ...
Influence of polymer insertion on the dielectric, piezoelectric and acoustic properties of 1-0-3 polyurethane/cement-based piezo composite
(2019-11-01)
Cement/polyurethane based piezo composite was fabricated with 1-0–3 connectivity. Microstructural analysis shows that polyurethane (PU) acts as a binder, reducing the porosity and improving the matrix adhesion to the ...
A comparative study of two indirect methods to monitor surface integrity of ground components
(Sage Publications Ltd, 2020-02-03)
One of the major challenges in grinding is to conciliate the material removal rate with components free from damages. Due to the poor thermal conductivity of conventional grinding wheels, most of the heat generated during ...
Modeling and Dynamic Analysis of an Electrical Helmholtz Resonator for Active Control of Resonant Noise
(2017-10-01)
This paper describes a theoretical and experimental investigation into an electrical Helmholtz resonator (EHR): that is, an active noise control (ANC) loudspeaker used in conjunction with a microphone and a feedback ...
Impedance-type approximations of the P-P elastic reflection coefficient: Modeling and AVO inversion
(Soc Exploration GeophysicistsTulsaEUA, 2004)
Piezoelectric transducers assessed by the pencil lead break for impedance-based structural health monitoring
(Ieee-inst Electrical Electronics Engineers Inc, 2015-02-01)
The pencil lead break (PLB) is a well-known method for characterizing acoustic emission sensors. In this paper, we analyze the effectiveness of this method in characterizing piezoelectric transducers for structural health ...
An experimental assessment of PZT patches for impedance-based SHM applications
(2014-12-01)
In this paper, we present an alternative method for assessing the sensitivity of lead zirconate titanate (PZT) piezoceramics for damage detection in structural health monitoring (SHM) systems based on the electromechanical ...
Finite Element Analysis and Optimization of a Single-Axis Acoustic Levitator
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2010)
A finite element analysis and a parametric optimization of single-axis acoustic levitators are presented. The finite element method is used to simulate a levitator consisting of a Langevin ultrasonic transducer with a plane ...