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Model based current mode control design and experimental validation for a 3φ rectifier under unbalanced grid voltage conditions

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Journal of Modern Power Systems and Clean Energy 2018年第4期6卷 777-790页

作者： P.R.MARTínEZ-RODRIGEZ Jose M.SOSA Samuel ITURRIAGA-MEDInA gerardo ESCOBAR gerardo vázquez-guzmán Andres A.vALDEZ-FERnánDEZ School of Sciencies UASLP Laboratory of Electrical and Power Electronics ITESI School of Engineering Universidad Modelo

This paper addresses the control design and the experimental validation of a current mode control for a three phase voltage source rectifier. The proposed control law is able to fulfill the voltage regulation and the current tracking control objectives despite of unbalanced and distorted grid voltages. The proposed control law consists of two loops, which are referred as inner tracking loop and the outer voltage regulation loop. The inner loop is designed to provide damping to the system, which also includes and adaptive mechanism. The construction of the current reference is based on the positive component detection of thegrid voltage. Therefore, the current produced by the power rectifier is proportional to the fundamental component of the grid voltage, despite of the presence of unbalanced grid voltages. The voltage regulation loop is designed as a proportional-integral controller, which is aimed to regulate the DC output voltage to a desired level. Finally, experimental results are obtained in an experimental prototype of2 kW to evaluate the performance of the proposed controller.

关键词： Pulse-width modulation rectifier Power factor correction Positive-component Current mode control

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Logistic Methods in Calculating Mortality Index in Hidalgo México

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Applied Mathematics 2015年第8期6卷 1193-1199页

作者： gerardo Martínez-guzmán Mario Mauricio Bustillo-Díaz Alejandro Rangel-Huerta Gabriel Juárez-Díaz Apolonio Ata-Pérez nicolás Quiroz-Hernández Rogelio González-velázquez María Beatríz Bernabe-Loranca Facultad de Ciencias de la Computación Benemérita Universidad Autónoma de Puebla Puebla México

Mortality projections in a population are based on the prior analysis of mortality in a region, hoever, there are populations where data are not available or not reflect its real mortality level, that is, the projections depend on hypothesis strength of previous data. Based on these assumptions, the mathematical method Genova I Maleras 1997 used the most recent data and the model tables from the United nations (Un). This method was applied to a mortality survey of the population of Hidalgo State, Mexico, projecting to year 2030. This method has not been applied in Mexico.

关键词： Mortality Projection Genova I Maleras Method

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Effect of Cardioxane and Selenium on Lipoperoxidation and Levels of Dopamine in Rat Brain and Heart

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neuroscience & Medicine 2019年第4期10卷 354-368页

作者： David Calderón guzmán norma Osnaya Brizuela gerardo Barragán Mejía Hugo Juárez Olguín Lulú Sánchez Reyes Armando valenzuela Pereza norma Labra Ruiz Daniel Santamaría del Angel Laboratory of neurosciences Instituto Nacional de Pediatría (INP) Mexico City Mexico Laboratory of Experimental Bacteriology INP Mexico City Mexico Laboratory of Pharmacology INP Mexico City Mexico Faculty of Medicine Universidad Nacional Autónoma de Mexico Mexico City Mexico.

Background: Cardioxane has been probed in patients with advanced malignancies to protect the heart. Selenium, an essential micronutrient exerts varieties of functions such as antioxidant. The aim of this study was to test if cardioxane (CDX) and selenium (Se) have additive antioxidant protective effect on brain and heart, and their relation with dopamine levels. Methods: Thirty-six male Wistar rats divided in groups of 6 animals each, were treated as follows: G1, saline solution 0.9% (control);G2, 100 mg/kg of CDX;G3, 60 μg/kg of Se;G4, 20 mg/kg of 3-nitropropionic acid (3nP);G5, 3nP + CDX and G6, 3nP + Se. 3nP was used as an oxidative stress inducer. Drugs were administered intraperitoneally for 5 days. The animals were sacrificed on the last day of treatment and the brain and heart were extracted and used to measure lipid peroxidation, dopamine, glutathione (GSH), ATPase, calcium, and H2O2. Results: In G2 and G5, dopamine decreased in cortex and striatum while GSH increased in heart, cortex and cerebellum/medulla oblongata. ATPase activity increased in heart and cortex of groups 2, 3, 5 and 6. Lipoperoxidation and H2O2 increased in cortex of animals treated with 3nP. Conclusion: These results suggest that CDX increases antioxidant capacity in the brain and heart while selenium promotes alteration in dopamine metabolism in view of the capacity of 3nP to generate free radicals.

关键词： Brain Dopamine Heart Cardioxane Selenium 3-nitropropionic Acid

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Effect of nicotine on Dopamine and Glutathione Levels in Presence of Oligoelements in Brain Regions of Young Rats——Effect of nicotine on Brain Regions of Rat

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neuroscience & Medicine 2012年第3期3卷 281-286页

作者： David Calderón guzmán Ernestina Hernández García Francisca Trujillo Jiménez gerardo Barragán Mejía Hugo Juárez Olguín José A. Saldivar González Daniel Santamaria del Angel norma Osnaya Brizuela Departamento de Farmacología Facultad de Medicina Universidad Nacional Autónoma de México Laboratorio de Farmacología INP México City México Laboratorio de neuroquímica Instituto Nacional de Pediatría (INP) México City México Laboratorio de Patología Experimental México City México

Aim: The purpose of this study was to understand the mechanism of nicotine mediated addiction and the role of oligoelements in reducing its effect. Methods: Male Wistar rats (weight 80 g) were treated with single and repeated doses of nicotine and/or oligoelements as follows: group 1 (control) naCl 0.9%;group 2, nicotine (1 mg/kg);group 3, oligoelements (50 μl/rat);and group 4, nicotine (1 mg/kg) + oligoelements (50 μl/rat). All drugs were intraperitoneally administered for 4 days. Blood for the measurement of glucose was obtained from all the animals. Samples of the brain regions (cortex, hemispheres and cerebellum + medulla oblongata) of each rat were obtained and used to measure the concentrations of dopamine, GSH levels, and lipid peroxidation (TBARS) using fluorescence and spectrophotometric methods. Results: Glucose level increased in rats treated with nicotine and oligoelements (p vel decreased in cerebellum/medulla oblongata and hemispheres (p nimals. TBARS levels increased in cerebellum/medulla oblongata and hemispheres of animals treated with nicotine and oligoelements, but decreased in the same regions (p n rats treated only with oligoelements. The levels of dopamine decreased in cortex and hemispheres, but increased in cerebellum/medulla and oblongata regions of rats treated with both compounds (p nclusions: nicotine and oligoelements are associated with increase in the level of glucose, an effect that was more pronounced in the group treated with both drugs. Reduction of oxidative stress and dopamine metabolism may be involved in this effect.

关键词： Glutathione Lipid Peroxidation Oxidative Stress

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