Power Losses
Mostrando 13-24 de 145 artigos, teses e dissertações.
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13. LIQUID FLOW IN IMPELLER SWEPT REGIONS OF BAFFLED AND UNBAFFLED VESSELS WITH A TURBINE-TYPE AGITATOR
Abstract Liquid flow in the impeller swept region of vessels with a turbine-type agitator was examined for the flow path between the neighboring blades of the rotating impeller. Visualization of the flow and its measurement were done using particle tracking velocimetry with a camera rotating along with the impeller. Internal liquid flow of the impeller diffe
Braz. J. Chem. Eng.. Publicado em: 2015-12
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14. Maximum Power Transfer versus Efficiency in Mid-Range Wireless Power Transfer Systems
AbstractThe condition for maximum power transfer of 2-coils wireless power transfer (WPT) system is derived from circuit analysis and discussed together with the respective WPT system efficiency (η). In the sequence, it is shown that a 4-coils WPT system (which can be divided in source, two communication and load circuits) without power losses at the two co
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2015-06
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15. Effect of laser phototherapy in the prevention and treatment of chemo-induced mucositis in hamsters
The aim of this study was to investigate the effect of laser phototherapy (LPT) in the prevention and/or treatment of oral mucositis induced by 5-fluorouracil (5-FU; Eurofarma, São Paulo, Brazil) in hamsters. Ninety-six hamsters were divided into four groups (n = 24): Control (no treatment); Preventive [LPT from day (D) D-5 to D+5]; Therapeutic (LPT from D+
Braz. oral res.. Publicado em: 11/06/2013
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16. Geração distribuída aplicada à edificações : edifícios de energia zero e o caso do laboratório de ensino da FEC-Unicamp / Distributed generation applied to buildings : net zero energy buildings and the case of the laboratory at FEC-Unicamp
Electricity consumption in Brazil increased 47% in the last decade, and it is estimated that it will increase 55.6% until 2020. Most of the electricity generated in the country is based on large hydroelectric dams, located away from the major cities. The planned expansion of the generation park to meet this increase in the demand is also based on this model,
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/08/2012
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17. Demanda de potência do motor hidráulico do extrator primário da colhedora de cana-de-açúcar / Power demand in the hydraulic motor of primary extractor of the sugar cane harvester
The growing demand of sugar cane and the need for agility in the processing of this product, the agricultural sector led to seek cropping systems with greater capacity in the field. However, the sugar cane harvesters still have some critical points depending on the quality of work due to various types of product losses during harvest. Most of the deficiencie
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/08/2012
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18. Algoritmos para o planejamento da operação de sistemas modernos de distribuição de energia elétrica = : Algorithms for operation planning of modern electric distribution power systems / Algorithms for operation planning of modern electric distribution power systems
The distribution system operation planning stage is concerned with the determination of capacitor bank, transformer and voltage regulator settings. This must be accomplished considering active and reactive power injections of distributed generators and at the main substation, as well as physical and regulatory issues in order to improve the network performan
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/08/2012
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19. Análise da influência de variáveis operacionais de um sistema de trigeração sobre o desempenho termodinâmico e a distribuição das utilidades / Analysis of operational variables in a trigeneration system and their influence over thermodynamic performance and distribution of utilities
In this work a trigeneration system, simultaneous production of power, heat and cooling using only one energy source, was analyzed, aiming at a better energetic efficiency of the system, showing the influence of some operating variables of the process on the utilities generated and the efficiency of the overall system. In this study the influence of the comp
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/04/2012
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20. Propostas de procedimentos para o estabelecimento de metas de qualidade do serviço de distribuição de energia elétrica. / Proposals of procedures for setting targets for power distribution service quality.
This work presents a review of the methodology used in PRODIST 2010, and alternative proposals for setting targets and rates depending on quality of service (QoS). All analysis are supported in statistical interruption data studies of 6 electricity distribution companies (EDC) between 2007 and 2008 with different characteristics of DEC, FEC, number of users
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/03/2012
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21. ANALISE E PROJETO DO CONVERSOR BUCK INTERCALADO PARA ALIMENTAÇÃO DE LÂMPADAS DE DESCARGA EM ALTA PRESSÃO DE ALTA POTÊNCIA / INTERLEAVED BUCK CONVERTER ANALYSIS FOR HIGH POWER HIGH INTENSITY DISCHARGE LAMPS SUPPLYING
This work presents a detailed analysis about the interleaved buck converter applied to electronic ballasts to supply high power HID lamps, assuming the input voltage as a PFC stage output. As the output capacitor has a maximum value to be applied in parallel with the lamp, parallel operated converters are a suitable choice because the output current ripple c
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/02/2012
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22. Performance of single wire earth return transformers with amorphous alloy core in a rural electric energy distribution system
In this paper are presented some considerations about the performance of single wire earth return amorphous alloy core transformers in comparison with conventional silicon steel sheets cores transformers used in rural electric energy distribution network. It has been recognized that amorphous metal core transformers improve electrical power distribution effi
Mat. Res.. Publicado em: 08/05/2012
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23. Caracterização de ligas magnéticas sinterizadas para aplicação em núcleos de máquinas elétricas rotativas
The purpose of this work is to study the properties of ferromagnetic alloys obtained by Powder Metallurgy to construct cores of Rotary Electric Machines, usually mounted on rolled steel sheets. To perform these activities, iron power and their alloys obtained by a mixture with different percentages of phosphorus (1, 2 and 3%), silicon (1, 3 and 5%) and nicke
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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24. Análise das variáveis de entrada de uma rede neural usando teste de correlação e análise de correlação canônica / Analysis of input variables of an artificial neural network using bivariate correlation and canonical correlation
The monitoring of variables and diagnosis of sensor fault in nuclear power plants or processes industries is very important because an early diagnosis allows the correction of the fault and, like this, do not cause the production interruption, improving operators security and its not provoking economics losses. The objective of this work is, in the whole of
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/09/2011