Power Losses
Mostrando 1-12 de 145 artigos, teses e dissertações.
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1. Radially Periodic Metasurface Lenses for Magnetic Field Collimation in Resonant Wireless Power Transfer Applications
Abstract In this paper, a new procedure and topology of magnetic metasurface lens are proposed for improving the performance of Resonant Wireless Power Transfer systems. Firstly, three subwave-length unit cells are optimized in order to get negative magnetic permeability in the same frequency, each one with a different refractive index, and they are experime
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2022
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2. Analysis and Optimization of Ultra-Low-Power Rectifier with High Efficiency for Applications in Wireless Power Transmission and Energy Harvesting
Abstract The system capable of harvesting RF energy from the environment through an antenna and converting it into direct current energy to deliver to a load is known as rectenna. The rectifier circuit is an important part of the rectenna and its modeling is arduous since it employs a non-linear device working at extremely low power levels. In addition, ther
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-03
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3. Malting of preharvest sprouted wheat
RESUMO Germinação pré-colheita é um importante problema da cultura do trigo, sendo necessário encontrar alternativas para uso desses grãos porque eles são rejeitados pelos moinhos. No campo, sob determinadas condições climáticas, os grãos são estimulados a germinar, a atividade metabólica aumenta e as enzimas hidrolíticas alteram proteínas e c
Rev. Ciênc. Agron.. Publicado em: 04/11/2019
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4. Desastre socioambiental e Termo de Transação e Ajustamento de Conduta (TTAC) como instrumento de política pública: O caso da barragem de Fundão, MG
Resumo: Este artigo inscreve-se na agenda de pesquisa dedicada à compreensão dos processos de governança e participação social nas políticas públicas que estão sendo formuladas e implementadas visando à reparação da bacia do rio Doce, localizada nos estados brasileiros de Minas Gerais e Espírito Santo, em razão do desastre socioambiental de gran
Civitas, Rev. Ciênc. Soc.. Publicado em: 16/09/2019
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5. Electromagnetic Core Analysis of a DFIG State-Feedback Power Controller
Abstract The energy demand by modern society grows every day that allied with sustainable development requires the use of alternative sources in the new energy matrix. In this context, the wind energy as source by using a doubly-fed induction generator stands out due to its operational savings but still faces some conflicts in its power control. This paper p
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 12/09/2019
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6. Influence of microwave processing on the bioactive compounds, antioxidant activity and sensory acceptance of blackberry jelly
Abstract The purpose of this study was to evaluate the effect of microwave and microwave combined with vacuum on the nutritional and sensory characteristics of blackberry jelly, in order to verify if they are actually more viable methods of processing when compared to the traditional process in open pan. It was verified that the processing methods studied di
Food Sci. Technol. Publicado em: 09/09/2019
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7. Sedentary behavior and functional disability in older adults with low economic status: Monidi Study
Resumo O excesso de tempo despendido em atividades sedentárias pode intensificar as perdas funcionais entre idosos, no entanto, ainda são incipientes as informações sobre a quantidade de tempo em atividades sedentárias relacionadas a essas perdas. Objetivou-se determinar o poder preditivo do comportamento sedentário (CS) e estabelecer seus pontos de co
Rev. bras. cineantropom. desempenho hum.. Publicado em: 30/05/2019
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8. Head loss in laser-perforated thin-walled polyethylene pipes for irrigation
RESUMO Para reduzir custos fixos e operacionais em sistemas de irrigação pressurizados são produzidos tubos de polietileno com pequena espessura de parede, com orifícios de descarga perfurados a laser, que operam a baixas pressões (até 100 kPa). A caracterização hidráulica desses materiais é essencial para o dimensionamento dos sistemas de irrigaç
Rev. bras. eng. agríc. ambient.. Publicado em: 06/05/2019
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9. Characterization of grid-connected photovoltaic systems in Curitiba, Brazil
ABSTRACT In the search for new options for the establishment of the energy matrix of Brazil, the Grid-Connected Photovoltaic Systems (GCPVS) are configured as an alternative to urban centers, because they allow the power generation at distributed mode, that is, generate energy at the place where it will be consumed and inject the surplus energy into the netw
Braz. arch. biol. technol.. Publicado em: 29/10/2018
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10. Investigation on Solar PV generation and design of switched reluctance motor for Smart Agriculture actuation system
ABSTRACT This paper presents standalone solar photovoltaic (PV) powered fed actuation system employing a switched reluctance motor (SRM) particularly used in remote and rural areas. The converter efficiency is achieved by changing ON and OFF state of solar PV drive. An electronic commutation drives SRM drive with achieved by position hall sensor and encoder.
Braz. arch. biol. technol.. Publicado em: 08/10/2018
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11. Characterization and selection method of Venturi injectors for pressurized irrigation
ABSTRACT Venturi-type chemigation injectors are widely used due to their advantages: they do not require electric power and are cheap to operate. However, they also generate considerable energy losses which affect the pressure in the system. The correct characterization of these systems requires pressures to be correctly set at the inlet, injector and outlet
Rev. Ciênc. Agron.. Publicado em: 2018-06
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12. EFFECTIVE POWER AND HOURLY FUEL CONSUMPTION DEMANDED BY SET TRACTOR- COFFEE HARVESTER IN FUNCTION OF ADEQUACY TRACTOR BALLASTING
ABSTRACT: The mechanized gathering process of sweeping coffee is extremely important to reduce the losses of fruit not used in the harvesting operation. But this operation usually has a low operational performance and a high cost per unit collected in this way any measures that can effectively reduce costs increase the viability of the operation. In this sen
Eng. Agríc.. Publicado em: 2017-08