Temperature Signals
Mostrando 13-24 de 245 artigos, teses e dissertações.
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13. Assessment of cumulative damage by using ultrasonic C-scan on carbon fiber/epoxy composites under thermal cycling
In recent years, structural composites manufactured by carbon fiber/epoxy laminates have been employed in large scale in aircraft industries. These structures require high strength under severe temperature changes of -56° until 80 °C. Regarding this scenario, the aim of this research was to reproduce thermal stress in the laminate plate developed by temper
Materials Research. Publicado em: 19/06/2012
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14. Reconhecimento de PadrÃes AtravÃs de AnÃlises EstatÃsticas e Fractais Aplicadas a Dados de Ensaios NÃo-Destrutivos / Pattern Recognition by Statistical Fluctuation and Fractal Analyses Applied to Nondestructive Testing Data
In this work a procedure is studied for pattern classification related to different types of data, namely: (1) signals obtained from ultrasonic testing ( pulse-echo technique) and magnetic signals obtained from BarkhÃusen noise in samples of ferritic-pearlitic carbon steel tubes which, due to temperature effects, have shown microstructural changes as conseq
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/12/2011
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15. Estudo acústico de tubos de dimensões idênticas e materiais diferentes utilizando bocais de flauta doce e flauta transversal
Even though scientists have shown so far that the materials used in the construction of flutes has little interference in their respective sound characteristics, it seems that there is more to be discussed, because many musicians still insist that the material used in the construction of flutes influences significantly the sound produced. Thus, aiming to sea
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/08/2011
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16. A durabilidade da carroceria de um veículo de passeio simulada no laboratório
Durability tests are part of the experimental development of a product aiming to submit it to the service conditions by evaluating their performance for a specified time. Over the years, these tests initially conducted on public roads have migrated to proving grounds specially designed to reproduce certain service conditions and finally to the lab environmen
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/03/2011
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17. Espectrometria de absorção atômica como ferramenta analítica para determinação de elementos traço em biodiesel
In this work some procedures were developed for the determination of Na, K, Ca, Mg and P in biodiesel samples using atomic absorption spectrometry as an analytical tool. The determination of Na, K, Ca and Mg in biodiesel samples was performed using the technique of flame atomic absorption spectrometry (F AAS) and microemulsion as sample preparation. The opti
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/04/2010
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18. Conversor matricial indireto para acionamento de motor de indução trifásico
Matrix converter topologies, despite the technological challenges it still presents, offers interesting possibilities concerning volume, weight, operating temperature grade, life time and input power factor. In order to create sufficient design resources to build a working prototype, initially a brief theoretical research was conducted in direct and indirect
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/03/2010
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19. Câmaras climáticas para o envelhecimento acelerado: ação de microambientes sobre bens culturais
Environmental chambers were designed for the accelerated ageing of materials used in artistic artifacts to study the synergistic action of temperature, humidity, UV and visible radiation and gaseous pollutants. Two inox-steel/PTFE compartments are kept under controlled temperature and relative humidity, whose values are transmitted to a PC, which stores, plo
Química Nova. Publicado em: 2010
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20. Desenvolvimento e avaliação de um porta-amostra de baixo custo para caracterização elétrica de materiais cerâmicos
Conventional sample holder cells used to the electric characterization of ceramics at high temperature consists of an alumina tube and platinum wires and plates using a complex design. The high cost materials used in the conventional sampler holder cell were replaced by stainless steel and conventional ceramics. The sample holder was validated by characteriz
Química Nova. Publicado em: 2010
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21. Estudo da correlação entre temperatura corporal e dosagem de óxido nítrico plasmático em pacientes com sepse, sepse grave e choque séptico / Correlation between body temperature and dosage of plasma nitric oxide in patients with sepsis, severe sepsis and septic shock
Septic shock is the most common complication of sepsis and responsible for a large number of cases of death in intensive care units. In patients with sepsis, fever is one of the most common signs, but hypothermia can occur and is usually associated with severe infections, worse prognosis and high mortality. The confluence of several factors contributing to t
Publicado em: 2010
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22. DESENVOLVIMENTO DE UM PADRÃO DE REFERÊNCIA METROLÓGICA DE FREQÜÊNCIA LASER EM TORNO DE 532 NM / DEVELOPMENT OF A METROLOGICAL STANDARD LASER FREQUENCY REFERENCE AT 532 NM
This work is part of the project for development of the first metrology reference for frequency standard around 532 nm in Brazil for the practical realization of the definition of the meter. The study was conducted at the Laboratory Interferometry (Laint) Inmetro, through an agreement with the Posgraduation Program in Metrology for Quality Industrial, PUC-Ri
Publicado em: 2009
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23. Eficiência energética em ambientes prediais utilizando rede sem fio Zigbee e Controle Fuzzy
This objective of this work is the wireless intelligent building automation focusing on the rational use of energy without prejudice to the thermal comfort. The wireless approach, in this work, could better target retro-fitting of buildings, a great HVAC (Heating, Ventilation and Air Conditioning) market share in Brazil. We used split air conditioners, power
Publicado em: 2009
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24. Precipitation forecast aided by weather radar for early warning system of urban floods / Previsão de chuva com auxílio de radar de tempo visando a um sistema de alerta antecipado de cheias em áreas urbanas
To reduce human and material losses during floods it is feasible to concisely study the rainfall forecast as the main part of an early warning system. The use of weather radar information, when linked to physically-based forecast models, can contribute for monitoring and forecasting of intense rainfall episodes. Thus, the rainfall forecast, based on using of
Publicado em: 2009