Operational Switching
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. InteraÃÃo transitÃria entre transformadores de potencial capacitivos e linhas de transmissÃo: uma contribuiÃÃo para minimizar falhas
Coupling capacitor voltage transformers (CCVT) are widely used in power systems for monitoring, protection relays and control aplications. Failure of this equipment may cause unexpected outages of transmission lines (TL), which may result in severe penalties as imposed by the regulatory agency of the government. This fact requires speeding maintenance proced
Publicado em: 2008
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2. Otimização dinâmica da fermentação alcoólica no processo embatelada alimentada
This work presents an experimental and theoretical study of the dynamic optimization of the alcoholic fermentation in fed-batch mode utilizing the Saccharomyces cerevisiae yeast in a bioreactor of 5 L. Twelve experiments were carried out, three them in batch and nine in fed-batch mode, with initial sucrose concentrations between 154 and 195.6 g/L for the exp
Publicado em: 2008
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3. OtimizaÃÃo dinÃmica da fermentaÃÃo alcoÃlica no processo embatelada alimentada
This work presents an experimental and theoretical study of the dynamic optimization of the alcoholic fermentation in fed-batch mode utilizing the Saccharomyces cerevisiae yeast in a bioreactor of 5 L. Twelve experiments were carried out, three them in batch and nine in fed-batch mode, with initial sucrose concentrations between 154 and 195.6 g/L for the exp
Publicado em: 2008
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4. Avaliação da performance de motor a combustão interna e suas emissões utilizando biogasolina do craqueamento térmico de gorduras residuais
With the growing demand for fossil fuel and the need to minimize greenhouse gases emissions, investigative studies have been developed to allow the implementation of technologies that produce alternative fuels, with special emphasis for those developed from esterification/transesterification and catalytic cracking processes. The quality of the resulting prod
Publicado em: 2008
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5. Implicações da organização da produção e do trabalho na atividade dos montadores de montagem estrutural.
The Ergonomic Analysis of Work (AET), based on the Analysis of the Activity, was used to understand (a) what is exactly an assembler of structural assembly and (b) how those professionals articulate regulation mechanisms in order to guarantee their health as well as productivity. The first inquiry is answered by the Integrator Model of the Work Activity, evi
Publicado em: 2007
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6. Regulador de tensÃo com comutaÃÃo eletrÃnica de taps â anÃlise de operaÃÃo e proteÃÃo das chaves estÃticas
The interconnected operation of large electrical systems and the fast spreading of the electrical sector with an increasing presence of sensitive loads to supply voltage disturbances demanded that the current laws to adapt to consumer needs, for example, to ensure the maintenance of constant voltage levels throughout the feeders of the electrical power distr
Publicado em: 2007
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7. NEW NETWORK SOLUTIONS AND NEXT GENERATION ENTERTAINMENT SERVICES / NOVAS SOLUÇÕES DE REDES E SERVIÇOS DE ENTRETENIMENTO DE ÚLTIMA GERAÇÃO
The present dissertation is aiming at proposing a telecommunications network implementation using some new technologies where the emphasis is put on entertainment applications. The adopted solutions try to offer a selection grid that qualitatively cope with the economic level of some selected noble metropolitan areas in Brazil and rely in new routing, switch
Publicado em: 2005
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8. Design, development and implementation of a solid-state pulse modulator for high-power pulse transmitters / Projeto, desenvolvimento e construção de um modulador de pulso estado-solido para transmissores pulsados de alta potencia
This work describes the development of a modular line-type solid-state pulse modulator topology to be applied in magnetron pulsed power radar transmitters, commonly found on tracking, weather and air traffic management radars. This research includes the design, development and assembling of a pulsed modulator for the Barreira do Inferno Launching Center (CLB
Publicado em: 2005
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9. Conservação de energia eletrica em sistemas publicos de abastecimento de agua : otimização operacional da rede de Macapa
This work presents a modeI to optirnize the daily operational strategy of pumping in water supply systems with the objective of minirnizing the electrical energy use and cost. The modeI performs spatial and temporal analyses on the system to optirnizethe pumps switching, considering a daily horizon of programming with discrete intervals of three hours. The o
Publicado em: 1999
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10. SYNCHRONIZATION IN COMMUNICATION SYSTEMS / SINCRONIZAÇÃO EM SISTEMAS DE TELECOMUNICAÇÕES
This text deals with aspects of synchronization in telecommunication systems, with emphasis on the operational functions of synchronous demodulation, signal regeneration, multiplexing/demultiplexing (TDM) and digital switching. The methods of carrier recovery, clock recovery, phase locked loop and elastic store are presented. The final goal consists on the d
Publicado em: 1990
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11. Reaction kinetic model of a proposed plasma membrane two-cycle H(+)-transport system of Chara corallina.
Biophysical and numerical analysis methods were used to characterize and model the transport protein that gives rise to the acid and alkaline regions of Chara. A measuring system that permits the detection of area-specific current-voltage curves was used. These current-voltage curves, obtained from the inward current regions of Chara, underwent a parallel sh