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Synthesis and characterization of functionalized zero-valent iron nanoparticle
( Claudio Adrian Ruiz Torres ),( Gabriel Alejandro Martinez Castanon ),( Jose Elpidio Morales Sanchez ),( Jesus Maria Guajardo Pacheco ),( Rene Fernando Araujo Martinez ),( Yuhoon Hwang ),( Facundo Ru 한국물환경학회 2017 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2017 No.-
A cost-effective method to prepare size-controlled nanoscale zero-valent iron for nitrate reduction
Claudio Adrian Ruiz-Torres,Rene Fernando Araujo-Martinez,Gabriel Alejandro Martinez-Cas,J. Elpidio Morales-Sanchez,Tae-Jin Lee,Hyun-Sang Shin,Yuhoon Hwang,Abel Hurtado-Macias,Facundo Ruiz 대한환경공학회 2019 Environmental Engineering Research Vol.24 No.3
Nanoscale zero-valent iron (nZVI) has proved to be an effective tool in applied environmental nanotechnology, where the decreased particle diameter provides a drastic change in the properties and efficiency of nanomaterials used in water purification. However, the agglomeration and colloidal instability represent a problematic and a remarkable reduction in nZVI reactivity. In view of that, this study reports a simple and cost-effective new strategy for ultra-small (< 7.5%) distributed functionalized nZVI-EG (1-9 ㎚), with high colloidal stability and reduction capacity. These were obtained without inert conditions, using a simple, economical synthesis methodology employing two stabilization mechanisms based on the use of non-aqueous solvent (methanol) and ethylene glycol (EG) as a stabilizer. The information from UV-Vis absorption spectroscopy and Fourier transform infrared spectroscopy suggests iron ion coordination by interaction with methanol molecules. Subsequently, after nZVI formation, particle-surface modification occurs by the addition of the EG. Size distribution analysis shows an average diameter of 4.23 ㎚ and the predominance (> 90%) of particles with sizes < 6.10 ㎚. Evaluation of the stability of functionalized nZVI by sedimentation test and a dynamic light-scattering technique, demonstrated very high colloidal stability. The ultra-small particles displayed a rapid and high nitrate removal capacity from water.
Robust Nonlinear Control of AC Brushless Motor for Electric Vehicles Application
Langarica-Cordoba, Diego,Guerrero-Ramirez, Gerardo V.,Claudio-Sanchez, Abraham,Duran-Fonseca, Miguel A.,Adam-Medina, Manuel,Astorga-Zaragoza, Carlos-Manuel The Korean Institute of Power Electronics 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.4
This article proposes a robust nonlinear control based on Lyapunov's redesign, whose purpose is to deal with parametric uncertainty in the resistance of the motor windings. The robust controller design is based on the passivity properties of the motor, as well as energy shaping and damping injection. The application of this control technique is focused on electric vehicles mainly formed by a battery bank, a power inverter, an AC brushless motor and the mechanical transmission. The sine PWM technique is used to trigger the switching devices of inverter. The results were obtained from simulation, where is shown that robust control makes a proper tracking of electromagnetic torque.
Robust Nonlinear Control of AC Brushless Motor for Electric Vehicles Application
Diego Langarica-Cordoba,Gerardo V. Guerrero-Ramirez,Abraham Claudio-Sanchez,Miguel A. Duran-Fonseca,Manuel Adam-Medina,Carlos-Manuel Astorga-Zaragoza 전력전자학회 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.4
This article proposes a robust nonlinear control based on Lyapunov’s redesign, whose purpose is to deal with parametric uncertainty in the resistance of the motor windings. The robust controller design is based on the passivity properties of the motor, as well as energy shaping and damping injection. The application of this control technique is focused on electric vehicles mainly formed by a battery bank, a power inverter, an AC brushless motor and the mechanical transmission. The sine PWM technique is used to trigger the switching devices of inverter. The results were obtained from simulation, where is shown that robust control makes a proper tracking of electromagnetic torque.