Efficiency Of System Usage
Mostrando 13-24 de 29 artigos, teses e dissertações.
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13. Análise de Defeitos em Coordenadas de Fase Utilizando Modelagem a Quatro Condutores e Fluxo de Potência Continuado / Fault Analysis by Phase Coordinates Using Four-Wire Modeling and Continuation Power Flow / Análise de Defeitos em Coordenadas de Fase Utilizando Modelagem a Quatro Condutores e Fluxo de Potência Continuado / Fault Analysis by Phase Coordinates Using Four-Wire Modeling and Continuation Power Flow
The effects of neutral wires and system grounding in most power flow and fault analysis methodologies are neglected or merged into phases using Krons reduction method. Thus, the neutral wire and ground currents and voltages remain unknown, restricting the analysis. This work presents a new formulation for fault analysis in the phase domain using three-phase,
Publicado em: 2008
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14. Behavioral aspects in the use of ERP systems: study of a global organization / Aspectos comportamentais no uso de sistemas ERP: um estudo em uma organização global
Since the 1990s integrated information systems, better known as ERP (Enterprise Resource Planning) really started to take off as a potential solution for the integration of all core business areas in the organizations. ERP systems are commercial software applications that support and integrate organizational processes across functional boundaries .The identi
Publicado em: 2008
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15. Impactos da adoção de sistemas de informação no judiciário: pesquisa com usuários do sistema processual virtual em um juizado especial federal / Impacts of the adoption information systems in the judiciary: Survey Study in a Special Federal Judicial
The Information Technology (IT) is increasing his applicability to business, both private and public companies. It is necessary the adequate use of the new technologies and get cooperation and technology acceptance of the system. People tend to resist to the changes, contributing so that the technology is rejected or even it is not recognized as promoting of
Publicado em: 2007
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16. ANÁLISE DO DESEMPENHO DE UM SISTEMA DE COGERAÇÃO COM UMA MICROTURBINA A GÁS NATURAL / PERFORMANCE ANALYSIS OF A GAS FIRED MICROTURBINE BASED COGENERATION SYSTEM
In this dissertation the performance of a cogeneration system was simulated using data obtained in tests of a natural gas fired 30 kW microturbine, operated during peak hours, and coupled to a heat recovery unit to generate hot water to be consumed in the showers of the PUC-Rio Gymnasium, together with a thermal reservoir to match the demand. Initially, the
Publicado em: 2007
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17. Desenvolvimento e aplicação de polimorfismos de inserção: deleção do cromossomo x em genética forense
Nowadays the human genetic identification its based on the utilization of a set of autosomal markers, the microsatellites, which fulfils the majority of the forensic genetic labs requirements. However, there are some situations when that the usual autosomal microsatellites dont always offer good results. Those situations include cases where the genetic sampl
Publicado em: 2007
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18. Modelo de monitoramento e avaliação da confiabilidade e disponibilidade de sistemas de distribuição de energia elétrica com base nas condições de uso de transformadores. / A monitoring and evaluation model of the reliability and availability of electric power distribution systems based on transformers usage conditions.
This work presents and proposes a model to supervise and evaluate an electrical energy distribution system by applying the usage conditions based maintenance technique on the power and distribution transformers. Monitoring the distribution system transformers with the usage conditions technique allows the system administrator to perform a preventive maintena
Publicado em: 2006
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19. PERFORMANCE ANALYSIS OF THE CO-GENERATON POTENCIAL OF A 5 KW PEMFC / ANÁLISE DE DESEMPENHO DE UMA CÉLULA DE COMBUSTÍVEL TIPO PEM DE 5 KW COM REFORMADOR DE GÁS NATURAL E COGERAÇÃO
A 5 kW proton exchange membrane fuel cell (PEMFC) with a reformer has been installed and tested at the Pontifical Catholic University of Rio de Janeiro (PUC-Rio), Brazil, aiming the experimental determination of its performance and co-generation potential to increase the fuel chemical energy usage. The unit uses a fuel processor to convert energy from natura
Publicado em: 2006
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20. Estimação da direção de chegada (DOA) de sinais eletromagnéticos em canais reversos CDMA utilizando antenas inteligentes
The great effort of communications engineers is to create methods that allows improve spectrum usage efficiency, that is a scarce resource. The Code Division Multiple Access (CDMA) and the spatial processing techniques using array of antennas are two enable technologies to achieve this task. In this context, the smart antennas technique can improve the recep
Publicado em: 2006
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21. Mechanical tillage of mining degraded areas at Jamari National Forest (Rondonia - BR) / Mecanização no preparo de solo em areas degradadas por mineração na Floresta Nacional do Jamari (Rondonia-BR)
The usage of a nation s natural resources directly implies the manipulation of natural environments on the terrestrial surface. In this scenario, estimates indicate that mining contributes to one percent of the degradation of the soils of the planet. It is observable that, although it seems to be a small number, this percentage denotes a high intensity of de
Publicado em: 2005
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22. Estudo e desenvolvimento de um extrator de palhetas rotativas
The growth necessity to get higher separation efficiencies in the minimim space has incentivated the researchers to develop new kinds of equipment. The most employed equipment to carry out liquid-liquid extraction processes are the mechanically agitated ones because they provide better performances. Many other types of equipment are presented in literature.
Publicado em: 1997
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23. Geração e recuperação da sequencia de operações para o roteiro de fabricação
The world manufacturing situation have been enduring radical changes. The accelerating technological growth have significantly enlarged the variety of items created by manufacturing industries and specials focus have been given to the mechanical-metal field. ln order to enhance the quality and/or reduce costs on a attempt to search a new market or to keep th
Publicado em: 1994
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24. A Quantitative Affinity-Profiling System That Reveals Distinct CD4/CCR5 Usage Patterns among Human Immunodeficiency Virus Type 1 and Simian Immunodeficiency Virus Strains ▿
The affinity of human immunodeficiency virus (HIV) envelope for CD4 and CCR5 appears to be associated with aspects of R5 virus (virus using the CCR5 coreceptor) pathogenicity. However, entry efficiency results from complex interactions between the viral envelope glycoprotein and both CD4 and CCR5, which limits attempts to correlate viral pathogenicity with s
American Society for Microbiology (ASM).