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Collective Behavior of a Ring of Van Der Pol Oscillators under Gaussian and Random Coupling Schemes

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Open Journal of Applied Sciences 2014年第7期4卷 383-391页

作者： Miguel A. Barron dulce Y. medina Isaias Hilerio Departamento de Materiales Universidad Autonoma Metropolitana-Azcapotzalco Mexico D.F. Mexico

The collective behavior of a ring of coupled identical van der Pol oscillators is numerically studied in this work. Constant, gaussian and random distributions of the coupling parameter along the ring are considered. Three values of the oscillators constant are assumed in order to cover from quasilinear to nonlinear dynamic performance. Single and multiple coupled frequencies are obtained using power spectra of the long term time series. Phase portraits are obtained from numerical simulations, and the coupled behavior is analyzed, compared and discussed.

关键词： Coupled Oscillators Coupling Parameter Gaussian Distribution Oscillators Ring Random Distribution Van Der Pol Oscillator

Numerical Simulation of Decarburization in a Top-Blown Basic Oxygen Furnace

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Modeling and Numerical Simulation of Material Science 2014年第3期4卷 94-103页

作者： Miguel A. Barron dulce Y. medina Isaias Hilerio Departamento de Materiales Universidad Autonoma Metropolitana-Azcapotzalco Mexico City Mexico

An improved mathematical model to describe the decarburization process in basic oxygen furnaces for steelmaking is presented in this work. This model takes into account those factors or parameters that determine the bath-oxygen impact area, such as the cavity depth, the lance height, the number of nozzles and the nozzles diameter. In the thermal issue, the model includes the targeted carbon content and temperature. The model is numerically solved, and is validated using reported data plant. The oxygen flow rate and the lance height are varied in the numerical simulations to study their effect on the carbon content and decarburization rate.

关键词： Basic Oxygen Furnace Carbon Content Decarburization Lance Height Numerical Simulation Oxygen Flow Rate Oxygen Steelmaking

Luminescent Properties of the Mn<sup>2+</sup>Ion in Zinc Phosphate Glass

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Open Journal of Applied Sciences 2021年第11期11卷 1212-1217页

作者： Frida Lissete Flores Rivera dulce yolotzin medina velazquez Gabriela Verenice Arredondo Martínez Jorge Roberto Oliva Uc Carlos Eduardo Rodriguez Garcia Miguel Angel Barron-Meza Joan Reyes Miranda Autonomus Metropolitan University Material Area Mexico City Mexico Potosino Institute for Scientific and Technological Research Advanced Materials Division San Luis Mexico Faculty of Physics-Mathematics Autonomous University of Coahuila Saltillo Mexico

In the development of new optoelectronic devices, mainly those related to solid state technology (SSL), the generation of luminescent materials with high intensity in visible region and low cost is of vital importance. For this reason, this work presents the luminescent properties of zinc phosphate glasses doped with the manganese ion 2+. The manganese ion offers a series of advantages with respect to rare earths, such as a more accessible cost and an intense emission in the red color that make it a great candidate for the generation of new optoelectronic devices. The methodology for the synthesis is presented in this work, as well as its luminescent properties, for concentrations of 2%, 10%, 13% and 15% atomic.

关键词： Luminescence Manganese Advanced Glasses

Modeling and Simulation of Hot Metal Desulfurization by Powder Injection

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Open Journal of Applied Sciences 2015年第6期5卷 295-303页

作者： Miguel A. Barron Isaias Hilerio dulce Y. medina Departmento de Materiales Universidad Autonoma Metropolitana Azcapozalco Mexico City Mexico

The desulfurization of hot metal by the mono-injection of lime powder and the co-injection of lime, calcium carbide and magnesium powders is mathematically modeled. The mono-injection model is derived from the continuity equation and is validated using experimental results and data previously reported in the literature. The co-injection model and the rate constant of the injected mixture are determined from the molar fractions and rate constants of the individual powders. The effect of the lime content of the mixture on the desulfurization dynamics is studied and discussed.

关键词： CFD Simulation Co-Injection Desulfurization Hot Metal Desulfurization Lime Injection Powder Mono-Injection Powder Desulfurization

Regulation of the Reacted Layer Thickness in a Gas-Solid Reacting System

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Intelligent Control and Automation 2014年第3期5卷 91-96页

作者： Miguel A. Barron dulce Y. medina Gabriel Plascencia Centro de Investigacion e Innovacion Tecnologica-IPN Mexico D.F. Mexico Departamento de Materiales Universidad Autonoma Metropolitana Azcapotzalco Mexico D.F. Mexico

A mathematical model for the analysis of a gas-solid reacting system is presented. This model is an alternative to the classical shrinking-core model. The model has a structure that can be easily transformed into a canonical control form, which is proper for controller synthesis. Analytical solution of the model to describe the open-loop behavior is expressed in terms of the Lambert function. The Lambert function is evaluated from aTaylorexpansion series. Besides, a controller is proposed to regulate the reacted layer thickness using initially the diffusion coefficient as control input. The control law is synthesized employing the feedback linearization technique. Main contributions of this work are the synthesis of the layer thickness controller, and the employment of the process temperature as substitute of the diffusion coefficient as the control input.

关键词： Diffusion Coefficient Feedback Linearization Gas-Solid System Lambert Function Reacted Layer Thickness Regulation

Slag Splashing in a Basic Oxygen Furnace under Different Blowing Conditions

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Open Journal of Applied Sciences 2015年第12期5卷 819-825页

作者： Miguel A. Barron Isaias Hilerio dulce Y. medina Departamento de Materiales Universidad Autonoma Metropolitana Azcapotzalco Mexico D.F. Mexico

The influence of three different blowing conditions on the slag splashing process in a basic oxygen furnace for steelmaking is analyzed here using two-dimensional transient Computational Fluid Dynamics simulations. Four blowing conditions are considered in the computer runs: top blowing, combined blowing using just a bottom centered nozzle, combined blowing using two bottom lateral nozzles, and full combined blowing using the three top and the three bottom nozzles. Computer simulations show that full combined blowing provides greater slag splashing than conventional top blowing.

关键词： Basic Oxygen Furnace Bottom Blowing Combined Blowing Computational Fluid Dynamics Oxygen Steelmaking Refractory Lining Slag Splashing Top Blowing

Computer Analysis of a Methane Fired Crucible Furnace

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Open Journal of Applied Sciences 2018年第6期8卷 203-210页

作者： Fernando Santiago Miguel A. Barron Isaias Hilerio dulce Y. medina Departamento de Materiales Universidad Autonoma Metropolitana Azcapotzalco Ciudad de Mexico Mexico

Two design factors and one operation parameter of a methane fired crucible furnace are numerically explored in this work. These are the number of burners, the location of the exhaust gas exit, and the air-fuel ratio, respectively. Three dimensional steady state Computational Fluid Dynamics simulations are carried out in order to analyze the influence of the above factors on the mean cavity temperature in absence of thermal load, the methane content and the oxygen content of the exit gas.

关键词： Air-Fuel Ratio Computational Fluid Dynamics Crucible Furnace Exit Gas Composition Mean Temperature Numerical Simulations

Computer Simulation of the Multiphase Flow in a Peirce-Smith Copper Converter

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Open Journal of Applied Sciences 2018年第7期8卷 296-303页

作者： Oscar Barrios Miguel A. Barron dulce Y. medina Isaias Hilerio Departamento de Materiales Universidad Autonoma Metropolitana Azcapotzalco Ciudad de Mexico Mexico

The multiphase flow in a Peirce-Smith copper converter is numerically explored in this work. Molten matte, molten slag and air are the phases considered. The transient partial differential equations that constitute the mathematical model are discretized using a two-dimensional computational mesh. The Computational Fluid Dynamics technique is employed to numerically solve the discretized equations. The aim of the numerical analysis is to study the influence of the nozzle height on the phase distributions inside the converter. Three values of the nozzle heights are considered.

关键词： Computational Fluid Dynamics Copper Converter Multiphase Flow Nozzle Height Peirce-Smith Converter

CFD Analysis of Influence of Slag Viscosity on the Splashing Process in an Oxygen Steelmaking Converter

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Modeling and Numerical Simulation of Material Science 2013年第3期3卷 90-93页

作者： Miguel A. Barron dulce Y. medina Isaias Hilerio Departamento de Materiales Universidad Autonoma Metropolitana Azcapotzalco M&eacutexico D.F. M&eacutexico

Physical properties of molten slag such as viscosity, density and surface tension have a significant influence on the slag splashing process in an oxygen steelmaking converter. Particularly, viscosity determines the shear forces that rule droplets formation. Besides, stirring of the molten slag bath strongly depends on this property. In this work, the influence of viscosity on the efficiency of slag splashing is explored by means of transient Computational Fluid Dynamics simulations. Several values of viscosity are employed in the computer experiments. In order to quantify the splashing efficiency as function of slag viscosity, an average slag fraction on the converter walls is defined and calculated. CFD results are compared with those of an empirical expression, and at least qualitative agreement is found.

关键词： CFD Oxygen Steelmaking Refractory Lining Slag Viscosity Splashing Process