Ultrasound Transducers
Mostrando 1-12 de 18 artigos, teses e dissertações.
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1. Echotextural characteristics of the mammary gland during early lactation in two breeds of sheep varying in milk yields
Abstract The main goal of this preliminary study was to determine and compare ultrasonographic characteristics of the mammary gland in two genotypes of ewes varying in milk productivity at 2, 3 and 4 weeks after lambing. Ultrasonographic images of the udder were obtained using the 5.0- and 7.5-MHz transducers, in axial and coronal planes, in four low milk-yi
Anim. Reprod.. Publicado em: 25/11/2019
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2. Nondestructive evaluation of wood decayed by xylophagous organisms
The aim of this study was to investigate the effects of attack by xylophagous organisms on the physicomechanical properties of Araucaria angustifolia wood from the floor of a historic house in Pelotas, Southern Brazil using two nondestructive methods. To achieve this, samples were collected from the floor for visual assessment by photography in metric scale.
Mat. Res.. Publicado em: 02/07/2013
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3. 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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4. The use of the ultrasound measurement technique for the evaluation of mechanical properties of the ASTM A36 steels
This work presents a study about the correlations between the characteristics of the acoustic waves and the mechanical properties of low carbon hot rolled steel bars, through the comparison between the wave velocity or attenuation and the tensile strength, yield point or elongation of the material. The aim is the possibility of using this technique to predic
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-06
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5. Vibroacustografia na avaliação tridimensional de artroplastia total de quadril / Vibro-acoustography in the tridimensional evaluation of total hip arthroplasty
Vibro-acoustography (VA) is a high lateral resolution (<0.7 mm), speckle-free, non- ionizing and non-invasive image based on the nonlinear combination phenomenon of ultrasound waves (MHz) that generates a narrow focus region of low frequency (kHz). In this work, we propose a VA-based tridimensional evaluation of the exposed area of implants, after total hip
Publicado em: 2011
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6. Mepiquat chloride application on cotton at variable rate.
Mepiquat chloride (1.1 - dimethylpiperidinium chloride) are used to control excessive vegetative growth in cotton (Gossypium hirsutum L.) broadcast sprayed by ground or air. As proven by previous researches the variability of the cotton plants height in the field is large enough to justify the application of Mepiquat at variable rate. The major advantages of
INTERNATIONAL CONFERENCE ON PRECISION AGRICULTURE. Publicado em: 2011
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7. Acionamento de elemento ceramicos de tansdutores de ultra-som : circuitos de controle, de transmissão e de recpção / Ultrasound ceramic transducer arrays : control, transmission and reception circuits
Os equipamentos de imagem por ultra-som associam diferentes técnicas e provêm informações não só das estruturas anatômicas como também do estado funcional dos diversos sistemas, em tempo real, com excelente qualidade de imagem. Isto se deve ao desenvolvimento de transdutores cada vez mais aprimorados e, ainda, da utilização de eletrônica digital,
Publicado em: 2009
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8. Desenvolvimento de técnicas para avaliação de combustíveis nucleares tipo placa pelo método de ensaio por ultra-som
One of the most important steps in the fabrication processes of plate type nuclear fuels, intended to be used in research reactors or naval propulsion, is the development of nondestructive testing (NDT) methods and techniques for their quality assessment during fabrication and post-irradiation analysis. Those tests can contribute to detect discontinuities su
Publicado em: 2008
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9. Ultra-sonografia muscular cervical e pélvica de cães da raça Golden Retriever portadores e afetados pela Distrofia Muscular e em, terapia celular / Cervical e pelvic ultrasonography of Golden Retriever dogs carrying and affected by the Muscular Dystrophy and in cellular therapy
The dogs Golden Retriever with Muscular Dystrophy (GRMD) are considered experimental models for study of the Muscular Dystrophy of Duchenne that acomete human, and they are genetically homologue. We use the muscular ultrasound to evaluate the therapeutical evolution of injection of stem cells (SC). For this experiment we use 8, being 6 affected for disease a
Publicado em: 2008
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10. Sistema multicanal de geração e recepção de ondas ultra-sonicas para transdutor matricial linear / Multichannel system for generation and detection of ultrasonic waves with a linear array transducer
Ultrasound in medicine has gone through great evolution in the last few decades and has occupied important position as a tool for therapy and diagnosis. This is due to the ultrasound equipment be of relatively low-cost, ultrasound is a non-ionizing radiation, is a non-invasive imaging method, and the images are created and seen in real time. It is common the
Publicado em: 2006
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11. Análise de materiais piezelétricos compósitos para aplicações em transdutores de ultra-som. / Analysis of piezoelectric composite materials for ultrasonic transducers applications.
O objetivo deste trabalho é analisar materiais piezelétricos compósitos com conectividade 1-3 e 2-2 para aplicações em transdutores de ultra-som na faixa de MHz utilizando modelos matemáticos e verificações experimentais. O estudo de um material piezelétrico compósito pode ser feito através de seus três principais tipos de modos de vibração: mo
Publicado em: 2006
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12. Study of apodization of piezoeletric ceramics / Estudo da apodização de ceramicas piezoeletricas
The objective of this work was to optimize the process of apodization of piezoelectric ceramics disks, looking for the better relation between the insulating oil bath temperature and the smaIlest period of time through which the poling field must be applied. The apodization of the piezoelectric ceramic is performed to reduce the diffraction in the acoustic f
Publicado em: 2003