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Your search keyword '"Fernandes, Rafael O."' showing total 12 results
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12 results on '"Fernandes, Rafael O."'

6. Mitigation of the commutation failure problem in the HVDC multi-infeed scenario in Brazil using synchronized phasor measurement.

Author

Fernandes, Rafael O. and Tavares, Maria C.D.

Subjects
*ARTIFICIAL neural networks, *INTERCONNECTED power systems, *PHASOR measurement, *ARTIFICIAL intelligence, *FAILURE mode & effects analysis
Abstract

• There is no method to predict commutation failure in online mode with HVDC-LCC;. • The work proposes a solution using synchrophasor data predict commutation failure;. • Transient instability in the main transmission corridor in Brazil was evaluated;. • Use of artificial intelligence techniques, such as radial-based neural networks;. • Predictive index in online mode to predict commutation failure. This paper presents the Commutation Failure (CF) problem in the High Voltage Direct Current - Line-Commutated Converter (HVDC-LCC) scenario in Brazil through the monitoring of Short-Circuit Ratio (SCR), CF indexes, Direct Current (DC) link power, and the use of simulated synchrophasor data. The analysis was performed by training a neural network using data from the year 2020, and its robustness was verified using data from the year 2021 of the Brazilian Interconnected Power System (BIPS). Additionally, an analysis of transient instability in the North-South Transmission Corridor (NSC) will be presented right after the occurrence of CF by monitoring the Lyapunov transient instability margin, with the primary objective of bringing subsidies to the control center operation area according to the severity of the CF occurrence, preventing its propagation and mitigating it through real-time predictive actions, such as power redispatch on DC links and, thus, minimizing the occurrence of CF. [ABSTRACT FROM AUTHOR]

Published
2024
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8. Modulation of apoptosis by sulforaphane is associated with PGC-1α stimulation and decreased oxidative stress in cardiac myoblasts

Author

Fernandes, Rafael O., primary, Bonetto, Jéssica H. P., additional, Baregzay, Boran, additional, de Castro, Alexandre L., additional, Puukila, Stephanie, additional, Forsyth, Heidi, additional, Schenkel, Paulo C., additional, Llesuy, Susana F., additional, Brum, Ilma Simoni, additional, Araujo, Alex Sander R., additional, Khaper, Neelam, additional, and Belló-Klein, Adriane, additional

Published
2014
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11. DHEA Treatment Effects on Redox Environment in Skeletal Muscle of Young and Aged Healthy Rats

Author

Jacob, Maria H.V.M., Fernandes, Rafael O., Bonetto, Jéssica H.P., Mendes, Roberta H., da R. Araujo, Alex Sander, Belló-Klein, Adriane, and Ribeiro, Maria F.M.

Abstract

Background: Dehydroepiandrosterone (DHEA) is an important precursor of active steroid hormone, produced abundantly by the adrenal cortex with an age-dependent pattern. Objective: We investigated whether chronic DHEA administration impacts on redox status and on Akt protein activation in skeletal muscle during the aging process (3 and 24 months-old rats). Methods: Rats received one weekly dose/5 weeks of DHEA (10 mg/kg) or vehicle. Gastrocnemius muscle was removed to evaluate glutathione system, hydrogen peroxide, antioxidant enzymes, and expression of Akt kinase protein. Results: In the 3-months-old rats DHEA induced an increase in hydrogen peroxide when compared both to its control (276%) and the 24-months-old DHEA group (485%). Moreover, in the 24- months-old rats DHEA caused an increase in GSSG (41 and 28%), a decrease in reduced-GSH (55 and 51%), and a more oxidized redox status (reduction in GSH/GSSG ratio, 47 and 65 %) when compared to 3-month-old DHEA and to 24-months-old control groups, respectively. Both older groups had increased G6PDH (2.7 fold) and GST (1.7 fold) activities when compared to younger groups, independently of any DHEA treatment. However, there was no modulation of Akt protein (phosphorylated/total isoform). Conclusion: The results show that chronic DHEA administration to 3 and 24-months-old rats may not present positive effects regarding the redox environment in skeletal muscle without modulation of pro-survival Akt kinase. Due to the large-scale self-administration of DHEA as an “anti-aging” dietary supplement, it is crucial to investigate its molecular mechanisms over oxidative stressinduced related diseases.

Published
2018

12. Profile of Myocardial Oxidative Stress at 48h Post-Experimental Infarction in Wistar Rats Submitted to Cellular Therapy Relative to Cardiac Function

Author

Tavares, Angela M., primary, Schenkel, Paulo C., additional, Taffarel, Andreia C., additional, Alba, Rafael Dall, additional, Nicolaidis, Gabriela, additional, Fernandes, Rafael O., additional, Baldo, Guilherme, additional, Matte, Ursula S., additional, Bello-Klein, Adriane, additional, Rohde, Luis E., additional, and Clausell, Nadine, additional

Published
2007
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