Impulse Response
Mostrando 13-24 de 158 artigos, teses e dissertações.
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13. RELAÇÃO ENTRE AS DEZ PRINCIPAIS BOLSAS DE VALORES DO MUNDO E SUAS CO-INTEGRAÇÕES / RELATION AMONG THE TOP TEN STOCK MARKETS IN THE WORLD AND THEIR CO-INTEGRATIONS
A internacionalização somada à abertura dos mercados financeiros transformou as economias antes fechadas em economias abertas, provocou um intercâmbio entre as economias mundiais por meio das bolsas de valores. O objetivo deste estudo é examinar a relação entre os dez principais índices econômicos do mundo, sendo eles: Nova York (DJIA, S&P500 e Nasd
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/08/2011
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14. Detecção de falhas em circuitos eletrônicos lineares baseados em classificadores de classe única. / Fault detection in electronics linear circuits based in one class classifiers.
This work deals with the application of one class classifiers in fault detection. The faults to be detected are related parametric faults. The transfer function of each circuit was generated and the outputs signals with the components in and out of tolerance were analyzed. Pattern recognition and one class classifications tools are employed to perform the an
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/08/2011
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15. Modelagem de ondas ultrassônicas refletidas por superfícies de geometrias diversas. / Modeling for ultrasonics waves of reflected surfaces of various geometries.
Neste trabalho são analisados os campos acústicos gerados por transdutores ultrassônicos planos e circulares, do tipo pistão plano, no modo pulso-eco, trabalhando como emissor e receptor de ondas, com freqüências de 1,6 MHz, 2,25 MHz e 5 MHz. As ondas emitidas por esses transdutores interagem com interfaces denominadas alvos, com diversas geometrias de
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/05/2011
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16. Acoustic beam modeling of ultrasonic transducers and arrays using the impulse response and the discrete representation methods
The impulse response of the velocity potential and the discrete representation methods were used in order to model the acoustic field radiated by ultrasonic transducers and arrays. The first method deals with the calculation of the exact impulse response, in which solutions are possible only for simple geometries, such as the circular piston. The second meth
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-12
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17. The mechanical response of metallic sandwich beams under foam projectile impact loading
The dynamic response of the clamped sandwich beams was investigated by impacting the beams at mid-span with metal foam projectiles. Efects of applied impulse, face-sheet thickness and core thickness on the impact resistance of sandwich beams are discussed. Using strain gauge measurement technique, the deformation mechanism of sandwich beams was analyzed in t
Latin American Journal of Solids and Structures. Publicado em: 2011
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18. Crescimento da pecuária de corte no Brasil: fatores econômicos e políticas setoriais / The growth of beef cattle sector in Brazil: economic factors and sector policies
This study aims to identify the factors which are responsible for the excellent performance of the beef cattle sector, taking its growth in Brazil and the increase of beef exports into account. The construction of a theoretical model which is capable to support the specification process of the econometric model used to quantify the impacts of the variations
Publicado em: 2011
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19. Liberalização da conta de capital e fluxos de portfólio para o Brasil
The present work seeks to investigate the dynamics of capital account liberalization and its impact on short run capital flows to Brazil in the period of 1995-2002, considering different segments such as the monetary, derivative and equity markets. This task is pursued by developing a comparative study of financial flows and examining how it is affected by t
Publicado em: 25/06/2010
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20. Causalidade e transmissão de preços na cadeia avícola no período de 1997-2008 / Causality and prices transmission in the chain poultry for the period 1997-2008
The chicken meat productive chain in Brazil has shown itself as an interesting competitive subsidy, considering the exporting capacity and the differentiation of market products. Nevertheless, intersectorial relations in this system can be considered contradictory, and in some ways even conflictive. Regarding this, one has pursued to evaluate the price trans
Publicado em: 2010
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21. Desenvolvimento e caracterização de sensores quimicamente modificados para análise de sulfeto / Development and characterization of chemically modified sensors for analysis of sulfide
The developmental impulse of the present time has caused a continuous degradation of the environment, which increases the need of monitoring the contaminant levels launched in the natural water courses and industrial effluents. In this context, it is crucial to develop new methodologies of determination and quantification of various types of pollutants, with
Publicado em: 2010
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22. Identification of response patterns in the impulse tomography in tipuana (Tipuana tipu (Benth.) O. Kuntze / Identificação de padrões de resposta à tomografia de impulso em tipuanas (Tipuana tipu (Benth.) O. Kuntze
As árvores desempenham papel fundamental na qualidade ambiental das áreas urbanas. Como a floresta urbana é alvo constante de ações inadequadas de manejo, tais como podas inapropriadas, técnicas que visam avaliar a qualidade dos indivíduos e o risco de queda de árvores são fundamentais para a diminuição de possíveis danos causados aos equipamento
Publicado em: 2010
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23. Potencial evocado auditivo de tronco encefálico com estímulo de fala em crianças com distúrbio fonológico / Speech-evoked auditory brainstem responses in children with phonological disorders
INTRODUCTION: The Auditory Brainstem Response (ABR) is an objective measure that evaluates the integrity of the brainstem auditory pathway and that supplements the routine audiological procedures in the diagnosis of hearing impairment. Nowadays, studies have been developed in order to characterize the auditory evoked potentials obtained through speech stimul
Publicado em: 2009
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24. Transmission of prices and volatility in the marketing of pork / Transmissão de preços e da volatilidade na comercialização da carne suína
The pork chain, despite showing significant technical improvement and competitiveness, is still one of the most volatile sectors of Brazilian agribusiness, and marketing and price fluctuation is one of the main barriers for its development. Accordingly, the present study aimed to analyze the price ratios and volatility among production agents and major meat
Publicado em: 2009