Publicações - engenharias
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PUPO, YASMINE MENDES;
GOMES, JOÃO CARLOS;
Paulo V Farago;
NADAL, JESSICA MENDES;
ESMERINO, LUIS ANTÔNIO;
DANIELA F MALUF;
ZAWADZKI, SÔNIA F.;
Milton Domingos Michel;
Fabio A. Santos;
GOMES, OSNARA MARIA MONGRUEL
Palavra-chave:
alkylation;
antibacterial agents;
quaternary ammoniun compounds;
methacrylate polymer;
spectrum analysis
Áreas do conhecimento:
Ciências Exatas e da Terra; Química; Orgânica;
Ciências da Saúde; Odontologia; Ortodontia;
Engenharias; Engenharia de Materiais e Metalúrgica; Materiais Poliméricos
resumo ...
A quaternary ammonium methacrylate polymer (QAMP) with antimicrobial potential was synthesized. The resulting product (QAMP) was characterized by FTIR spectroscopy, NMR spectroscopy, visible spectr...
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Luiz Carlos Daemme;
PENTEADO NETO, RENATO A.;
Cláudio Furlan;
Marcelo Risso Errera;
et al
Palavra-chave:
Emissões automotivas;
Controle Ambiental
resumo ...
In order to comply with the introduction of new emission limits, motorcycles have been equipped with electronic injection systems and three-way catalytic converters for emissions abatement. However, these converters produce unwanted reactions, such as the formation of ammonia. This paper was focused
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Mariano, A.;
Oliver Mazouffre;
Bernardo Rego Barros de Almeida Leite;
Yann Deval;
Jean Baptiste Bégueret;
Didier Belot;
François Rivet;
Thierry Taris
Palavra-chave:
Circuitos mmW
resumo ...
This paper presents an ultra low power consumption 65 GHz LC-VCO dedicated to wireless high data rate applications. It is designed in a 65 nm CMOS SOI process, which improves passive devices behavior. The proposed VCO achieves a frequency tuning range (FTR) of 9.7 % and a phase noise of −110.86 dBc/Hz at 10 MHz of the carrier. All integrated passive components (including transmission lines and a transformer-based balun) are modeled using advanced electromagnetic (EM) field solvers. The power consumption of the proposed VCO is as low as 1.1 mW when biased by a 0.8-V supply voltage. The FoM of this millimeter wave circuit, whose core occupies a silicon footprint of only 0.047 mm2, is −184.07 dBc/Hz.
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William Bessa;
Wilson A Artuzi Jr;
RIBEIRO, EDUARDO PARENTE
SODEBRÁS,
v. 8,
n. 95,
p. 115-121,
2013
Palavra-chave:
capacitância;
efeito de borda;
método elementos finitos
Áreas do conhecimento:
Engenharias; Engenharia Elétrica; Medidas Elétricas, Magnéticas e Eletrônicas; Instrumentação; Medidas Elétricas;
Engenharias; Engenharia Elétrica; Medidas Elétricas, Magnéticas e Eletrônicas; Instrumentação; Instrumentação Eletrônica
resumo ...
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William Bessa;
RIBEIRO, EDUARDO PARENTE;
Marlio Bonfim;
Gideon Villar Leandro;
Marcelo Risso Errera
Palavra-chave:
Capacitance,;
Capacitive sensor;
Moisture measurement;
Soybeans
resumo ...
(en)
This study aims to evaluate the capacitive measurement method at low frequencies for determining the moisture content in soybeans. Furthermore, a technique for measuring the moisture content of soybeans at different temperatures is proposed. A practical cylindrical capacitor was designed for the experiments. Capacitive measurements at frequencies of 1 kHz, 10 kHz and 100 kHz were performed using an LCR meter. Two varieties of soybeans were used in the tests, and the differences were evaluated. The errors of the proposed method were analyzed, and the correlation between moisture content and capacitance was verified. The influence of temperature on the measurements was also quantified. Polynomial models are proposed to compensate for temperature variations. It was found that reasonable precision can be achieved at 100 kHz using the temperature compensation provided by the designed models.
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BESSA, W. S.;
RIBEIRO, EDUARDO PARENTE;
BONFIM, M. C.;
Gideon Villar Leandro;
Marcelo Risso Errera
Palavra-chave:
Capacitance;
Capacitive sensors;
Moisture measurement;
Soybeans;
temperature;
Polynomial model
Áreas do conhecimento:
Engenharias; Engenharia Elétrica; Telecomunicações
resumo ...
(en)
This study aims to evaluate the capacitive measurement method at low frequencies for determining the moisture content in soybeans. Furthermore, a technique for measuring the moisture content of soybeans at different temperatures is proposed. A practical cylindrical capacitor was designed for the experiments. Capacitive measurements at frequencies of 1 kHz, 10 kHz and 100 kHz were performed using an LCR meter. Two varieties of soybeans were used in the tests, and the differences were evaluated. The errors of the proposed method were analyzed, and the correlation between moisture content and capacitance was verified. The influence of temperature on the measurements was also quantified. Polynomial models are proposed to compensate for temperature variations. It was found that reasonable precision can be achieved at 100 kHz using the temperature compensation provided by the designed models.
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William Bessa;
RIBEIRO, EDUARDO PARENTE;
BONFIM, MARLIO;
Gideon Villar Leandro;
Marcelo Risso Errera
Palavra-chave:
Secagem;
Instrumentação
resumo ...
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BESSA, W. S.;
RIBEIRO, E. P.;
BONFIM, MARLIO;
LEANDRO, G. V.;
Marcelo Risso Errera
Palavra-chave:
Instrumentação Eletrônica;
Medidas Elétricas;
agricultura de precisão
resumo ...
(en)
This study aims to evaluate the capacitive measurement method at low frequencies for determining the moisture content in soybeans. Furthermore, a technique for measuring the moisture content of soybeans at different temperatures is proposed. A practical cylindrical capacitor was designed for the experiments. Capacitive measurements at frequencies of 1 kHz, 10 kHz and 100 kHz were performed using an LCR meter. Two varieties of soybeans were used in the tests, and the differences were evaluated. The errors of the proposed method were analyzed, and the correlation between moisture content and capacitance was verified. The influence of temperature on the measurements was also quantified. Polynomial models are proposed to compensate for temperature variations. It was found that reasonable precision can be achieved at 100 kHz using the temperature compensation provided by the designed models.
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Adriano Scheid;
Ana Sofia Climaco Monteiro D'Oliveira
Palavra-chave:
CoMoCrSi Alloy;
CoCrWC Alloy;
Plasma Transferred Arc (PTA);
Temperature Stability
resumo ...
CoCrWC alloys are widely used to protect components that operate under wear and high temperature...
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COELHO, THIAGO CAVALCANTE;
Elizete Maria Lourenço;
Antonio José Alves Simões Costa
Palavra-chave:
Estimação de Estado em Sistemas Elétrico de Potênc;
Identificação de Error de Topologia;
Modelagem da Rede no Nível de Subestação
Áreas do conhecimento:
Engenharias; Sistemas Elétricos de Potência; Transmissão da Energia Elétrica, Distribuição da Energia Elétrica
resumo ...
During the last decade, the development of topology error identification methods in power system real-time modeling has been driven by the detailed representation of suspect regions of the network and also by the adoption of a two-stage approach to perform state estimation. Most research efforts deal with specific methodologies to be used in the first or in the second stage. This paper proposes a unified approach capable of determining the region of impact of topology errors in the first stage of state estimation, as well as to perform topology error identification carried out in the second stage. Both stages are formulated as optimization problems, whose solutions are obtained by Hachtel’s method, so that Lagrange multipliers are made available in both cases. Correlation indices previously proposed in the literature are expressed as a function of those multipliers and employed to determine an anomaly zone, which contains all modeling errors. In addition, graph-theoretical algorithms are used to extend the anomaly zone, so as to ensure connectivity and other topological properties required at the second stage. The proposed methodology is tested through several simulations conducted with the IEEE 30 bus test-system.
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