Fading
Mostrando 13-24 de 132 artigos, teses e dissertações.
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13. Fading and graphite nucleation sites in grey iron inoculated using silicon carbide
ABSTRACT The most commonly used inoculants for producing grey iron are ferrosilicon based, but also there are reports indicating that silicon carbide can act as inoculant. There are few published studies of fading and nucleation sites of graphite when silicon carbide is used as inoculant, thus the understanding of the inoculation effect of silicon carbide is
Matéria (Rio J.). Publicado em: 22/06/2017
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14. Reviewing Microbial Behaviors in Ecosystems Leading to a Natural Quorum Quenching Occurrence
ABSTRACT Quorum sensing is considered one of the most important discoveries in cell-to-cell communication. Although revealed in Bacteria, it has been identified as well as a mechanism present in the other two domains, Eukaryota and Archaea. This phenomenon consists mainly of an exchange and sensing of "words" produced by each cell: chemical signals known as
Braz. arch. biol. technol.. Publicado em: 22/06/2017
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15. Depression and psychodynamic psychotherapy
Depression is a complex condition, and its classical biological/psychosocial distinction is fading. Current guidelines are increasingly advocating psychotherapy as a treatment option. Psychodynamic psychotherapy models encompass a heterogeneous group of interventions derived from early psychoanalytic conceptualizations. Growing literature is raising awarenes
Rev. Bras. Psiquiatr.. Publicado em: 12/06/2017
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16. Use of Natural Rubber Membranes as Support for Powder TiO2and Ag/TiO2 Photocatalysts
The purpose of this study was to synthesize TiO2-polymer composites able to act as photocatalyst membranes. TiO2 catalysts were prepared using the sol-gel method to contain 0.0, 0.5, 1.0, and 2.0 wt.% of embedded Ag particles, subsequently incorporated into natural rubber latex at a weight fraction of 15%. Samples of these ceramic powders were suspended in a
J. Braz. Chem. Soc.. Publicado em: 2016-03
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17. Channel characterization in the 5.8GHz band in a suburban area
Based on signal measurements carried out in the 5.8 GHz band, which is reserved for unlicensed WiMAX in Brazil, this paper evaluates narrowband and wideband characteristics on the suburban area of Tanguá city in Rio de Janeiro State. Fading statistics, coverage and adjusted prediction model such as Hata-COST 231, SUI and UFPA were used in order to find the
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2014-06
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18. Construção de um programa de ensino de pré-requisitos de leitura e escrita para pessoas com deficiência intelectual / Development of program to teach reading and spelling prerequisites for students with intellectual disabilities
Since its dawn, Behavior Analysis stood out in the search for ways of teaching complex repertoires to persons with intellectual retardation. Procedures built on stimulus equivalence have proved highly effective and economical, especially with regard to academic and symbolic skills. In Brazil, there is a tradition of successful research concerning the teachin
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/09/2012
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19. Approximation and higher order Statistics for the Kappa-Mu phase fading model = : Aproximação e estatísticas de ordem superior para a fase do modelo de desvanecimento Kappa-Mu / Aproximação e estatísticas de ordem superior para a fase do modelo de desvanecimento Kappa-Mu
Esta tese apresenta alguns resultados importantes das estatísticas de fase do modelo de desvanecimento kappa-mu. Em particular, a taxa de cruzamento de fase é obtida de maneira exata. Adicionalmente, para evitar a complexidade das formulações exatas, foram propostas soluções aproximadas para as seguintes estatísticas: taxa de cruzamento de fase e fun�
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/08/2012
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20. On the fading parameters characterization of the alpha-mu distribution : measurements and statistics = Caracterização dos parâmetros de desvanecimento da distribuição alfa-mu: medidas e estatísticas / Caracterização dos parâmetros de desvanecimento da distribuição alfa-mu : medidas e estatísticas
Esta tese apresenta os resultados de medidas de campo conduzidas na freqüência de 5.5 GHz, com o objetivo de caracterizar os parâmetros do modelo de desvanecimento alpha-mu. Mais especificamente, uma quantidade de situações é investigada para se determinar a densidade de probabilidade e a função de autocorrelação destes parâmetros. O range de valo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/12/2011
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21. Um estudo sobre a robustez de técnicas de processamento de sinais em sistemas MIMO / A study regarding robustness of signal processing techniques in MIMO systems
Multiple antenna wireless communication systems achieve high data transmission rates and good robustness to channel fading when signals traveling through the system are jointly processed in their transmitters and/ or receivers. In general, signal detection techniques assume perfect knowledge of the channel state information, in both transmitter and receiver,
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/06/2011
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22. Grain refinement of AZ91D magnesium alloy by MgCO3
The grain refining technique of AZ91D magnesium alloy by MgCO3 has been investigated. The refining mechanism and tensile properties of the resulting alloy have also been discussed. The results indicate that MgCO3 can decrease its grain size from 311 to 53µm. Correspondingly, the tensile properties are obviously improved. The higher the cooling rate from add
Materials Research. Publicado em: 01/04/2011
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23. Desempenho de enlaces sem fio em condições muito severas de desvanecimento e modelagem estatistica de canais de desvanecimento correlacionados e com parametros arbitrarios / Wireless link performance under severe fading condititions and stastical modeling of correlated fading channels with arbitrary parameters
Este trabalho avalia o desempenho de enlaces sem fio em condições muito severas de desvanecimento. Para isso, uma nova distribuição de probabilidade, a ?-µ Extrema, é investigada como modelo de desvanecimento para descrever o sinal propagado em tais condições. Ajustes a dados de campos publicados na literatura e coletados em um ambiente confinado e o
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/04/2010
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24. Blue thermoluminescence emission of annealed lithium rich aluminosilicates
The blue thermoluminescence (TL) emission of different thermally annealed (i) β-eucryptite (LiAlSiO4), (ii) virgilite-petalite (LiAlSi5O12) and (iii) virgilite-petalite-bikitaite (LiAlSi10O22) mixed crystals have been studied. The observed changes in the TL glow curves could be linked to simultaneous processes taking place in the lithium aluminosilicate lat
Brazilian Journal of Physics. Publicado em: 2010-09