Ultrasonic Pulse
Mostrando 13-24 de 32 artigos, teses e dissertações.
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13. Tableros de partículas de bambú (Bambusa vulgaris Schrad) y resina poliuretana a base de aceite de rícino (Ricinus communis L.)
The aim of this study was to manufacture and evaluate particleboards made with two alternative materials, seeking to develop a sustainable production process. Particles from Bambusa vulgaris Schrad were used because of the fast production cycle of this species. The binder used was castor oil (Ricinus communis L.) based polyurethane resin, since it is partial
Ambiente Construído. Publicado em: 2010-12
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14. Efeito do envelhecimento por ciclagem mecânica ou ciclagem em autoclave na resistência à flexão de cerâmicas odontológicas / Mechanical and autoclave cycling effect on flexural strength of dental ceramics
The aims of this study were: to perform a microestrutural analysis of dental ceramics and correlate the results with the flexural strength obtained; to evaluate two aging process (mechanical cycling and autoclave cycling) on the flexural strength of the materials and to evaluate the specimen configuration (bar or disc) on the flexural strength of mechanical
Publicado em: 2010
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15. Simuladores para medição de fluxo de liquidos por efeito doppler para controle de qualidade de equipamentos de ultra-sonografia / Doppler phantoms for flow measurement of liquids for ultrasond equipment quality control
In this work it is proposed the development of phantoms to allow de quality control of ultrasounds equipments functioning on the Doppler mode with national technology and accessible cost. The device consists of a hydraulic circuit with a peristaltic pump, mixture simulating human tissue, tubes simulating arteries and blood-mimicking fluid. The peristaltic di
Publicado em: 2008
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16. Porosity dependence of elastic constants in aluminum nitride ceramics
Aluminum nitride is a relatively new engineering ceramic and its mechanical properties have not been extensively studied. In this work, the effects of porosity (~0 to 38%) on sonic velocities, Poisson's ratio, and elastic moduli of partially sintered A1N, both pure and with additives, were investigated. The elastic constants, determined by the ultrasonic pul
Materials Research. Publicado em: 2007-06
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17. Análise da mudança de cor em concretos submetidos a altas temperaturas como indicativo de temperaturas alcançadas e da degradação térmica / Color Change Analysis in Concretes Exposed to High Temperatures as Indicative of Reached Temperatures and Thermal Degradation
A avaliação de uma estrutura danificada por incêndios usualmente inicia por observações visuais do concreto, incluindo sua mudança de cor. A mudança de cor observada no concreto exposto a altas temperaturas persiste após seu resfriamento, constituindo-se em uma ferramenta importante para uma avaliação preliminar do nível de deterioração do concr
Publicado em: 2007
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18. Ultrasonic characterization of composite materials. / Caracterização de materiais compostos por ultra-som.
In this work, two ultrasonic non destructive techniques were implemented in a water tank and used to determine the elastic constants of glass-epoxy composites samples. The first is the through-transmission technique implemented with a pair of ultrasonic transducers. The second is the back-reflection technique that uses a single transducer in pulse-eco mode.
Publicado em: 2006
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19. Homogeneous particlebord from bamboo bonded by polyurethane resin castor oil based / Chapas de particulas homogeneas de bambu aglomeradas com resinas poliuretana bi-componente a base de oleo de mamona
The aim of this research Homogeneous Particleboard of Bamboo Bonded whith Poliurethane Resin Castor Oil Based was to manufacture and to evaluate particleboards made with two alternative materials, looking for the productive process sustainability. Particles from Bambusa vulgaris were employed due to the its fast production cycle and its availability in B
Publicado em: 2006
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20. Estudo comparativo das propriedades mecânicas do concreto produzido com água tratada magneticamente
TThe related work, as a perspective of concrete improvement, seeks to analyze concrete behavior with magnetically treated water compared with the obtained results on conventionally produced concrete (common or tap water). The objective is to evaluate the effects of the magnetical treatment water in the workability of the concrete as well as on the mechanical
Publicado em: 2006
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21. Desenvolvimento de tecnicas de ultra-som para medida de espessura de filme de liquido em escoamentos gas-liquido e liquido-liquido / Development of ultrasonic techniques for measurements of liquid film thickness in gas-liquid and liquid-liquid flows
Um dos problemas cruciais no atual cenário da indústria nacional de petróleo é a medição das vazões de óleo, gás e água produzidos por cada poço. Este problema se agrava no contexto da produção de óleos pesados sob condições offshore em águas profundas, dadas as condições adversas desse ambiente, alta viscosidade do óleo, formação de em
Publicado em: 2006
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22. Estudo da antinocicepção induzida pelo ultrasom terapêutico no modelo experimental de dor neuropática trigeminal, em ratos
The trigeminal neuralgia (TN) is considered one of the most painful conditions, where the pharmacological treatment can be as debilitating as the pathology itself. The aim of this work was to evaluate the effectiveness of pulsed Therapeutic Ultrasound (USt) on an experimental model of trigeminal neuropathic pain (Infraorbital Nerve - Chronic Constriction Inj
Publicado em: 2006
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23. The use of artificial neural network in the classification of pulse-echo and TOFD ultra-sonic signals
The present work evaluates the application of artificial neural networks for pattern recognition of ultrasonic signals using pulse-echo and TOFD (Time of Flight Diffraction) techniques in weld beads. In this study pattern classifiers are implemented by artificial neural network of backpropagation type using MATLAB®. The ultrasonic signals acquired from puls
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2005-12
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24. AplicaÃÃo dos mÃtodos de pulso-eco e resonÃncia acÃstica para caracterizaÃÃo nÃo destrutiva de propriedades elÃsticas e microestruturais de vidros especiais e aÃo ferrÃtico degradado por fluÃncia
The elastic properties, homogeneity, attenuation of the propagation of ultrasonic waves and associated structure with some types of special glass were analyzed with the pulse-echo method. A total of seven samples of glass containing neodymium, lead, zirconium and niobium, as additives were analyzed. As a result, elastic constants such as coefficient of Poiss
Publicado em: 2005