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Tapia-Hernandez, Alejandro,Ponce-Silva, Mario,Olivares-Peregrino, Victor Hugo,Valdez-Resendiz, Jesus Elias,Hernandez-Gonzalez, Leobardo The Korean Institute of Power Electronics 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.4
The main contribution of this paper is the use of sensorless active diodes to generate the gate signals for a three-phase boost-rectifier with a self-powered control scheme. The sensorless operation is achieved making use of the gate control signals generated by the active diode schemes on each of the switching devices using a pulse width half-controlled boost rectifier modulation technique (PWM-HCBR). The proposed scheme synchronizes the gate control signals with a three phase voltage supply. Autonomous operation is obtained making use of the output DC bus to feed the control circuitry, the active diodes and the driver circuitry. The three-phase boost-rectifier is supplied by a three-phase permanent magnet electric generator powered by a solar concentrator dish with variable voltage and variable frequency conditions. Experimental results report an efficiency of up to 94.6% for 25 W and an input of 3.6 V peak per phase with 450.
An approach for screening single phase high-entropy alloys using an in-house thermodynamic database
Tapia, Antonio Joã,o Seco Ferreira,Yim, Dami,Kim, Hyoung Seop,Lee, Byeong-Joo Elsevier 2018 INTERMETALLICS Vol.101 No.-
<P><B>Abstract</B></P> <P>A new screening methodology is proposed to aid in the development of high-entropy alloys (HEAs). This approach takes into account three commonly used criteria and methods to guide the design of HEAs: empirical parameters, binary phase diagram inspection and the Calculation of Phase Diagrams (CALPHAD) method. In addition, two novel concepts are introduced: a criterion to evaluate the likeliness of single phase solid solution in an alloy system's non-equiatomic compositional space, and a binary priority list, which allows us to make the employed in-house thermodynamic database a more reliable tool for solid solution screening in a time-effective manner.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A novel and easy to replicate screening methodology was proposed in order to guide the design of high-entropy alloys (HEAs). </LI> <LI> A criterion to evaluate the likeliness of single phase solid solution in the non-equiatomic compositional space was proposed. </LI> <LI> A criterion to identify the most relevant weaknesses for solid solution screening in a thermodynamic database was proposed. </LI> <LI> Over one hundred thousand compositions of HEAs candidate systems were analyzed; promising new HEA systems were identified. </LI> <LI> Two novel HEAs (Co<SUB>10</SUB>Fe<SUB>10</SUB>Mn<SUB>35</SUB>Ni<SUB>35</SUB>Zn<SUB>10</SUB> and Co<SUB>10</SUB>Fe<SUB>10</SUB>Mn<SUB>30</SUB>Ni<SUB>30</SUB>Zn<SUB>20</SUB>) were fabricated. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Competencia Políticay Gasto Social en México
Cristina Tapia Muro,Leonardo Gatica Arreola 한국라틴아메리카학회 2014 라틴아메리카연구 Vol.27 No.2
Who are the voters who have benefited from a tactical distribution of budget of the political class? There is an important literature which seeks to explain the political criteria that underlies the distribution of the public spending. This article provides a study of the Mexican case. Specifically, a panel data model is estimated, providing evidence for the incidence of political criteria in the expansion of the “Oportunidades” social program during the period 2002-2010. The result of our model shows that political turnover and a high degree of political competition could partially explain the municipal assignations from “Oportunidades”.
Evershed and Counter-Evershed Flows in Sunspot MHD Simulations
Siu-Tapia, A. L.,Rempel, M.,Lagg, A.,Solanki, S. K. American Astronomical Society 2018 The Astrophysical journal Vol.852 No.2
<P>There have been a few reports in the literature of counter-Evershed flows observed in well-developed sunspot penumbrae, i.e., flows directed toward the umbra along penumbral filaments. Here, we investigate the driving forces of such counter-Evershed flows in a radiative magnetohydrodynamic simulation of a sunspot, and compare them to the forces acting on the normal Evershed flow. The simulation covers a timespan of 100 solar hours and generates an Evershed outflow exceeding 8 km s(-1) in the penumbra along radially aligned filaments where the magnetic field is almost horizontal. Additionally, the simulation produces a fast counter-Evershed flow (i.e., an inflow near tau = 1) in some regions within the penumbra, reaching peak flow speeds of similar to 12 km s(-1). The counter-Evershed flows are transient and typically last a few hours before they turn into outflows again. By using the kinetic energy equation and evaluating its various terms in the simulation box, we found that the Evershed flow occurs due to overturning convection in a strongly inclined magnetic field, while the counter-Evershed flows can be well-described as siphon flows.</P>
Alejandro Tapia-Hernandez,Mario Ponce-Silva,Victor Hugo Olivares-Peregrino,Jesus Elias Valdez-Resendiz,Leobardo Hernandez-Gonzalez 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.4
The main contribution of this paper is the use of sensorless active diodes to generate the gate signals for a three-phase boost-rectifier with a self-powered control scheme. The sensorless operation is achieved making use of the gate control signals generated by the active diode schemes on each of the switching devices using a pulse width half-controlled boost rectifier modulation technique (PWM-HCBR). The proposed scheme synchronizes the gate control signals with a three phase voltage supply. Autonomous operation is obtained making use of the output DC bus to feed the control circuitry, the active diodes and the driver circuitry. The three-phase boost-rectifier is supplied by a three-phase permanent magnet electric generator powered by a solar concentrator dish with variable voltage and variable frequency conditions. Experimental results report an efficiency of up to 94.6% for 25 W and an input of 3.6 V peak per phase with 450.
Angelo E. Tapia-Araya,Idoia Díaz-Güemes Martin-Portugués,Laura Fresno Bermejo,Francisco Miguel Sánchez-Margallo 대한수의학회 2015 Journal of Veterinary Science Vol.16 No.4
This study was conducted to evaluate the feasibility and therapeutic safety of laparoendoscopic single-site ovariectomy (LESS-OVE) and 3-portal laparoscopic ovariectomy (Lap-OVE) in dogs. Ten female mixed breed dogs were included in the study. Dogs were divided into group 1 (LESS-OVE; n = 5) and group 2 (Lap-OVE; n = 5). All procedures were performed by laparoscopic-skilled surgeons, and the anesthetic protocol was the same for all patients. In both groups, the ovarian vascular pedicle and ligaments were transected using a bipolar vessel sealer/divider device. The mean total surgical time was slightly longer in LESS-OVE (36.6 ± 3.5 min) than Lap-OVE (32.0 ± 3.0 min); however, the differences were not significant. Perioperative complications were not reported in any group. Both laparoscopic techniques were shown to be equally feasible and safe for patients. However, surgeons found LESS-OVE to require more skill than Lap-OVE. Therefore, additional studies should be conducted to evaluate this novel approach in clinical veterinary practice, and a proper laparoscopic training program for veterinary surgeons should be developed.