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RISS 인기검색어
- 검색키워드
- 저자 : Miguel Aguilar (검색결과 5 건)
- 무료
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A Robust Controller for Trajectory Tracking of a DC Motor Pendulum System
Carlos Aguilar-Ibañez,Julio Mendoza-Mendoza,Jorge Davila,Miguel S. Suarez-Castanon,Ruben Garrido M. 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.4
This work presents a solution to the output feedback trajectory tracking problem for an uncertain DCmotor pendulum system under the effect of an unknown bounded disturbance. The proposed algorithm uses a ProportionalDerivative (PD) controller plus a novel on-line estimator of the unknown disturbance. The disturbanceestimator is obtained by coupling a standard second-order Luenberger observer with a third-order sliding modes differentiator. The Luenberger observer provides estimates of the motor angular position and velocity. Moreover, anideal disturbance estimator in terms of the Luenberger observer error and its first and second time derivatives is obtainedfrom the observer error formulae; these time derivatives are not available from measurements. Subsequently,the sliding modes third-order differentiator allows obtaining estimates of these time derivatives in finite time. Theestimates replace the real values of the first and second time derivatives in the ideal disturbance estimator thusproducing a practical disturbance estimator, and also permit obtaining an estimate of the motor angular velocity. Adepart from previous approaches is the fact that the disturbance is not directly estimated by the Luenberger observeror the third-order differentiator. Numerical simulations and real-time experiments validate the effectiveness of theproposed approach.
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Guillermo J. Zavala,Miguel A. Pando,Youngjin Park,Rafael Aguilar 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.2
An experimental study was performed to investigate the dissipated energy to failure of sand samples subjected to uniform and non-uniform cyclic simple shear loading. The hypothesis evaluated was that for a given initial sample state the specific dissipated energy required to reach failure should be reasonably constant independent of the type of stress-time history used in the testing. Test samples consisted of dry Ottawa sand prepared at nine different initial states that were subjected to different stress controlled cyclic horizontal shear loading waveforms that included 15 uniform sinusoidal waves and up to 33 non-uniform loading wave forms. The experimental program presented showed that the measured cumulative dissipated specific energy to failure, defined when the double amplitude shear strain reaches 7.5%, for the different sample initial states was reasonably constant but with coefficients of variation ranging between 13 to 44%. As expected, the cumulative dissipated energy increased with increasing initial stress level and relative density. The findings support the notion that specific dissipated energy can be used as a reasonable failure predictor for uniform dry sands based on their initial state and are independent of the type of cyclic simple shear loading waveform using in the testing.
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Marco Antonio Sa´ntiz-Go´mez,Miguel Angel Mazorra-Manzano,Hugo Enrique Ramı´rez-Guerra,Susana Marı´a Scheuren-Acevedo,Gerardo Navarro-Garcı´a,Ramo´n Pacheco-Aguilar,Juan Carlos Ramı´rez-Sua´rez 한국식품과학회 2019 Food Science and Biotechnology Vol.28 No.3
Chemical properties of fish gelatins differ fromthose of conventional mammalian sources, representing anattractive technological alternative for the food industry. Ray filleting generates a considerable amount of skin wastethat can be used as a collagen source for gelatin extraction. Thus, this research evaluated the HCl and CH3COOHeffect, at 0.01, 0.025, 0.05, 0.075, 0.1, 0.15, and 0.2 M, onextraction yield, molecular weight distribution, and gelstrength (GS) of whiptail stingray (Dasyatis brevis) skingelatins. Results showed differences (P\0.05) betweenacid type and concentration used. CH3COOH (0.15 M)gave the highest extraction yield (7.0% vs. 5.5% at 0.15 MHCl) and GS (653 ± 71 g vs. 619.5 ± 82 g at 0.2 M HCl). Gelatin electrophoretic profile from CH3COOH revealeda-/b-components and high molecular weight ([200 kDa)polymers. Ray gelatin GS was higher than commercialbovine gelatin, suggesting its possible use for technologicalfood applications.
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Comparison of physicochemical pretreatments of banana peels for bioethanol production
Sócrates Palacios,Héctor A. Ruiz,Rodolfo Ramos-Gonzalez,José Martínez,Elda Segura,Miguel Aguilar,Antonio Aguilera,Georgina Michelena,Cristóbal Aguilar,Anna Ilyina 한국식품과학회 2017 Food Science and Biotechnology Vol.26 No.4
Pretreatments with different concentrations of sulfuric acid (0, 0.5, and 1% v/v) and temperatures (28 and 121 C at 103 kPa in an autoclave) were performed on banana peels (BP) milled by mechanical grinding and grinding in a blender as well as without grinding. Cellulose, hemicellulose, lignin, ash, and total and reducing sugar contents were evaluated. The highest yields of cellulose enzymatic hydrolysis (99%) were achieved with liquefied autoclaved BP treated with 0.5 and 1% acid after 48 h of hydrolysis. Ethanol production by Kluyveromyces marxianus fermentation was assayed using hydrolyzed BP at 10, 15, and 20% (w/w). The highest ethanol level (21 g/ L) was reached after 24 h of fermentation with 20% (w/w) BP. Kinetics of the consumption of reducing sugars under this fermentation condition demonstrates the presence of a lag period (about 8 h). Thus, BP are a good source for ethanol production.
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Removing Lipemia in Serum/Plasma Samples: A Multicenter Study
María-José Castro-Castro,Beatriz Candás-Estébanez,Margarita Esteban-Salán,Pilar Calmarza,Teresa Arrobas-Velilla,Carlos Romero-Román,Miguel Pocoví-Mieras,José-Ángel Aguilar-Doreste,Sociedad Española de 대한진단검사의학회 2018 Annals of Laboratory Medicine Vol.38 No.6
Background: Lipemia, a significant source of analytical errors in clinical laboratory settings, should be removed prior to measuring biochemical parameters. We investigated whether lipemia in serum/plasma samples can be removed using a method that is easier and more practicable than ultracentrifugation, the current reference method. Methods: Seven hospital laboratories in Spain participated in this study. We first compared the effectiveness of ultracentrifugation (108,200×g) and high-speed centrifugation (10,000×g for 15 minutes) in removing lipemia. Second, we compared high-speed centrifugation with two liquid-liquid extraction methods—LipoClear (StatSpin, Norwood, USA), and 1,1,2-trichlorotrifluoroethane (Merck, Darmstadt, Germany). We assessed 14 biochemical parameters: serum/plasma concentrations of sodium ion, potassium ion, chloride ion, glucose, total protein, albumin, creatinine, urea, alkaline phosphatase, gamma-glutamyl transferase, alanine aminotransferase, aspartate-aminotransferase, calcium, and bilirubin. We analyzed whether the differences between lipemia removal methods exceeded the limit for clinically significant interference (LCSI). Results: When ultracentrifugation and high-speed centrifugation were compared, no parameter had a difference that exceeded the LCSI. When high-speed centrifugation was compared with the two liquid-liquid extraction methods, we found differences exceeding the LCSI in protein, calcium, and aspartate aminotransferase in the comparison with 1,1,2-trichlorotrifluoroethane, and in protein, albumin, and calcium in the comparison with LipoClear. Differences in other parameters did not exceed the LCSI. Conclusions: High-speed centrifugation (10,000×g for 15 minutes) can be used instead of ultracentrifugation to remove lipemia in serum/plasma samples. LipoClear and 1,1,2-trichlorotrifluoroethane are unsuitable as they interfere with the measurement of certain parameters.
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