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Mostrando 13-24 de 641 artigos, teses e dissertações.
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13. Damped Jacobi Methods Based on Two Different Matrices for Signal Detection in Massive MIMO Uplink
Abstract For massive multiple-input multiple-output (m-MIMO) uplink, the performances of the linear minimum mean-square error (MMSE) detector are considered near optimal, and they occupy benchmark place for most linear iterative detectors. However, the MMSE algorithm is known by its load computational complexity due to the implication of large-scale matrix i
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2021-03
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14. Passively Q-Switched Pulses Generation from Erbium-Doped Fiber Laser Using Lutetium Oxide as Saturable Absorber
Abstract In this paper, a configuration of a passive Q-switched Erbium-doped fiber laser (EDFL) using a Lutetium Oxide (Lu2O3) thin film as a saturable absorber (SA) is experimentally implemented to generate high pulse energy with a high signal to noise ratio. A stable Q-switched pulse train is initiated at the input pump power of 30.442mW, and a maximum pul
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2021-03
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15. Wide Band Stop Response Using Interdigital Capacitor/CSRR DGS in Elliptical Microstrip Low-Pass Filter
Abstract In this paper, a compact elliptic-response microstrip low pass filter (LPF) is presented with a wide stop-band using stepped impedance resonators. With high attenuation in the stop-band, the overall size reduction of the proposed filter is achieved using a novel defected ground structure technique using an interdigital capacitor and complementary sp
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-12
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16. Performance evaluation of GSA, SOS, ABC and ANN algorithms on linear and quadratic modelling of eggplant drying kinetic
Abstract In this study, kinetics of eggplant drying was modeled in the laboratory-scaled Food Drying Oven (FDO) with resistance heater was designed and manufactured. The temperature, energy consumption and drying time of FDO were recorded by keeping the temperature of at different temperatures as 40, 50 and 60 °C. These saved values were chosen as the input
Food Sci. Technol. Publicado em: 2020-09
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17. Avaliação da eficiência técnica de clones de eucalipto em escala comercial: uma abordagem empregando Data Envelopment Analysis (DEA)
Resumo O presente artigo refere-se à utilização da metodologia de análise de envoltória de dados (DEA) para determinar e comparar a eficiência técnica de clones de eucalipto dos gêneros Eucaliptus urophylla e Eucaliptus grandis, em escala comercial, produzidos no período de 2016 e 2017 e com idades de corte entre 5 e 7 anos. O plantio desses clones
Ciênc. Florest.. Publicado em: 2020-04
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18. 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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19. ARTIFICIAL NEURAL NETWORKS FOR PREDICTION OF PHYSIOLOGICAL AND PRODUCTIVE VARIABLES OF BROILERS
ABSTRACT Due to a number of factors involving the thermal environment of a broiler cutting installation and its interaction with the physiological and productive responses of birds, artificial intelligence has been shown to be an interesting methodology to assist in the decision-making process. For this reason, the main aim of this work was to develop an art
Eng. Agríc.. Publicado em: 2020-02
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20. Hydroelectric Generators Competing in Cascades*
Abstract Hydroelectric generation is the main source of energy production in many countries. When firms operate in the same river, or in cascades, the output of an upstream firm is the input of its downstream rival. We build a dynamic stochastic duopoly model of competition in cascades and show that the decentralized market is inefficient when rain is freque
Rev. Bras. Econ.. Publicado em: 01/01/2020
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21. Performance evaluation of GSA, SOS, ABC and ANN algorithms on linear and quadratic modelling of eggplant drying kinetic
Abstract In this study, kinetics of eggplant drying was modeled in the laboratory-scaled Food Drying Oven (FDO) with resistance heater was designed and manufactured. The temperature, energy consumption and drying time of FDO were recorded by keeping the temperature of at different temperatures as 40, 50 and 60 °C. These saved values were chosen as the input
Food Sci. Technol. Publicado em: 20/12/2019
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22. O debate desenvolvimentista no Brasil e o papel da indústria: novos resultados de antigas lições
Resumo O artigo contribui para o debate desenvolvimentista no Brasil, a partir de dados obtidos na matriz de insumo-produto brasileira de 2014. Uma vez estimada a matriz com dados do IBGE, o artigo calcula os impactos de aumentos de investimento em termos de efeitos de encadeamento, geração de empregos, salários, produção e requisitos de importações,
Econ. soc.. Publicado em: 13/12/2019
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23. Uma Nota Sobre Consumo Energético, Emissões, Renda e Emprego na Cadeia de Soja no Brasil
Resumo Este artigo, com base na desagregação das matrizes energéticas de 2000 a 2014, compatíveis com as matrizes insumo-produto do Brasil, aponta que a Cadeia Soja no agronegócio responde por 12,70% do PIB, 12,10% dos empregos, 9,80% do consumo de energia e 8,70% das emissões de CO2. Verificou-se, uma mudança estrutural pautada pela expansão do prod
Rev. Bras. Econ.. Publicado em: 25/11/2019
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24. Perceptions of wheat producers towards risk and risk management strategies: A case study from Turkey
RESUMO: Neste estudo a percepção de risco dos produtores de trigo na Turquia foi examinada com base em um estudo de caso realizado na província de Bitlis. O conjunto de dados utilizado no estudo foi obtido de 157 agricultores, aleatoriamente. A análise fatorial foi empregada para classificar as fontes de risco e as estratégias de manejo, e então a regr
Cienc. Rural. Publicado em: 25/11/2019