Sound Radiation
Mostrando 1-12 de 14 artigos, teses e dissertações.
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1. Numerical Study of Vibro-Acoustic Responses of Un-Baffled Multi-Layered Composite Structure under Various End Conditions and Experimental Validation
Abstract This article presents the vibro-acoustic modeling and analysis of un-baffled laminated composite flat panels subjected to harmonic point load under various support conditions. The frequency values of the panel are obtained by using simulation model through the commercial finite element package (ANSYS) via batch input technique. Initially, the rate o
Lat. Am. j. solids struct.. Publicado em: 2017-08
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2. 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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3. Characterization of Swallowing Sounds with the Use of Sonar Doppler in Full-Term and Preterm Newborns
Introduction Technological advances have provided a large variety of instruments to view the swallowing event, aiding in the evaluation, diagnosis, and monitoring of disturbances. These advances include electromyography of the surface, dynamic video fluoroscopy, and most recently sonar Doppler. Objective To characterize swallowing sounds in typical
Int. Arch. Otorhinolaryngol.. Publicado em: 2013
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4. Intensidade acústica útil: um novo método para identificação de regiões radiantes em superfícies com geometrias arbitrárias / Useful acoustic intensity: a new method for the identification of radiant regions on surfaces with arbitrary geometries
Neste trabalho é descrita a teoria necessária para a obtenção da grandeza denominada intensidade supersônica, a qual tem por objetivo identificar as regiões de uma fonte de ruído que efetivamente contribuem para a potência sonora, filtrando, consequentemente, a parcela referente às ondas sonoras recirculantes e evanescentes. É apresentada a abordag
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/03/2012
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5. Simulação de um arranjo esférico de alto-falantes usando um modelo de membrana flexível / Simulation of a spherical loudspeaker array using a flexible membrane model
Duas abordagens para a simulação do campo sonoro produzido por um arranjo esférico de alto-falantes são apresentadas e comparadas a resultados experimentais. Na primeira, modos estruturais obtidos da analise modal experimental da membrana são usados em simulações vibroacusticas por elementos de contorno no software LMS Virtual.Lab®. Na segunda, adota
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/08/2010
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6. Design of optimum system of viscoelastic vibration absorbers with a Frobenius norm objective function
Vibration absorbers, also called vibration neutralizers, are mechanical systems to be attached to another mechanical system, or structure, called the primary system, with the purpose of reducing vibration and sound radiation. The simplest form of a vibration absorber is that of a single degree of freedom system, where the "spring" is made of a viscoelastic m
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2009-09
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7. Avaliação dos efeitos promovidos pela radiação azul na remineralização do esmalte dentário in vitro / EFFECTS OF BLUE LIGHT IRRADIATION ON DENTAL ENAMEL REMINERALIZATION IN VITRO
This study aimed to investigate the effects of blue radiation on dental enamel remineralization. In addition, a methodology of analysis was developed to evaluate alterations of enamel mineral content by optical coherence tomography. Artificial lesions were formed in bovine dental enamel slabs by immersing the samples in undersaturated acetate buffer (2 mL/mm
Publicado em: 2009
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8. 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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9. Efeitos das ondas acústicas em pupas de Ceratitis capitata. (Wied., 1824) (Diptera: Tephritidae) / EFFECTS OF ACOUSTIC WAVES ON PUPES OF Ceratitis capitata. (Wied., 1824) (Diptera: Tephritidae)
The aim of this research has been to investigate the hypothesis that acoustic waves would provoke a measurable effect on a population of fruit flies, a treatment denominated sonication. Ionizing radiation, the causative agent for the treatment designated by irradiation has been used as a reference, as long as its effects on living beings and particularly on
Publicado em: 2007
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10. Supersonic acoustic intensity : implementation and evaluation / Intensidade acustica supersonica : implementação e verificação
This work presents an experimental implementation and evaluation of the acoustic parameter named Supersonic Acoustic Intensity (SAI) which permits determining the part of the acoustic intensity of sound source that will be radiate to farfield. This parameter permits quantify precisely the radiation efficiency or acoustic radiator to solve the vibroacoustic p
Publicado em: 2006
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11. MECHANISM, BEHAVIOR AND EVOLUTION OF CALLING IN FOUR NORTH AMERICAN TREEFROGS / Mecanismos de produção de som em anfíbios norte americanos: biomecânica, comportamento e evolução
Acoustic communication in frogs is an important model system for the study of behavioral evolution in vertebrates. This study aimed to extend the current model on the mechanism of calling in frogs in order to strengthen the bridge between behavioral and physiological knowledge in the field. The limits and tradeoffs of sound production by the passive larynx w
Publicado em: 2003
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12. Estimation of Radiation Resistance Values of Microorganisms in Food Products
Several statistical methods, including the conventional technique of Schmidt and Nank, were evaluated for estimating radiation resistance values of various strains of Clostridium botulinum by the use of partial spoilage data from an inoculated ham pack study. Procedures based on quantal response were preferred. The tedious but rigorous probit maximum likelih