Digital Signal Distribution
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Redes de redistribuição de sinais a partir de redes de freqüência única (SFN)
This dissertation presents details of a structure needed to create a Single Frequency Network (SFN) using low-power transmitters, and a comparison with a network composed of a single transmitter with high power. Among the difficulties to implement networks which distribute signals in SFN, has prioritized the synchronization issue and equalization techniques
Publicado em: 2010
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2. Classificação de distúrbios na rede elétrica usando redes neurais e wavelets
Post dispatch analysis of signals obtained from digital disturbances registers provide important information to identify and classify disturbances in systems, looking for a more efficient management of the supply. In order to enhance the task of identifying and classifying the disturbances - providing an automatic assessment - techniques of digital signal pr
Publicado em: 2008
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3. Análise metodológica do tratamento de dados sar r99b para discriminar incremento de desflorestamento no sudoeste da amazônia brasileira
- The estimate and mapping of deforestation in Brazilian Amazon has been carried out yarly, with the objective to monitor the forest resources, and as a mean for giving support to governmental control actions. This systematic monitoring is executed by the PRODES Digital project, developed by the Brazilian National Institute for Space Research (INPE), using L
Publicado em: 2008
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4. Investigações relativas ás linhas de transmissão horizontal e vertical de perdas elevadas
This document presents the laboratory measurements and time and frequency domain simulations and calculations regarding the high loss horizontal and vertical transmission lines aiming at improve the knowledge of their performance and well understand the electromagnetic interaction between the lightning channel and the electrical facilities. Impulsive and har
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/07/2004
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5. Avaliação de Técnicas para Transmissão Digital em Canal com Desvanecimento Lento e Não seletivo em Freqüência Modelado com a Distribuição n-
In this dissertation, a theoretical and mathematical study about fading channels modeled according to the n- distribution is presented. The n- distribution includes the Hoyt and the Nakagami-m distributions as special cases, and therefore, the One-Sided Gaussian and the Rayleigh distributions also constitute special cases. This dissertation presents the eval
Publicado em: 2003
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6. Desenvolvimento de um sistema para detecção de falhas de alta impedancia em redes de distribuição
In this thesis, the development of a methodology for detection of High Impedance Faults in primary distribution feeders is presented. The technique used is based on the feeder response to a short pulse signal periodicaly injected at the substation outlet. The response to each pulse is compared to the ones previously stored in a database. The database contain
Publicado em: 1996
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7. Quantitative electromyography: a new analogue technique for detecting changes in action potential duration
An automatic method using an analogue analyser is described for obtaining an index which is based on the mean phase duration of an EMG signal. This method gives similar values for motor unit action potential duration to an alternative digital method of analysis based on the distribution of time intervals between zero crossings of the EMG signal. The analysis
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8. Microspectroscopic imaging tracks the intracellular processing of a signal transduction protein: fluorescent-labeled protein kinase C beta I.
We have devised a microspectroscopic strategy for assessing the intracellular (re)distribution and the integrity of the primary structure of proteins involved in signal transduction. The purified proteins are fluorescent-labeled in vitro and reintroduced into the living cell. The localization and molecular state of fluorescent-labeled protein kinase C beta I
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9. Spatial and temporal distribution of agonist-evoked cytoplasmic Ca2+ signals in exocrine acinar cells analysed by digital image microscopy.
High resolution digital video imaging has been employed to monitor the spatial and temporal development of agonist-induced cytosolic Ca2+ signals in fura 2-loaded exocrine acinar cells. Enzymatically isolated mouse pancreatic and lacrimal acinar cells or small acinar cell clusters were used. These retain their morphological polarity so that the secretory gra