Adan Ramirez - Academia.edu (original) (raw)
Papers by Adan Ramirez
Uno de los enfoques utilizados para generar recomendaciones de fertilización para los cultivos es... more Uno de los enfoques utilizados para generar recomendaciones de fertilización para los cultivos es el de balance nutrimental, basado en que la dosis de fertilización depende de la demanda del nutrimento por el cultivo, el suministro del nutrimento por el suelo y la eficiencia de recuperación del nutrimento aplicado como fertilizante. Este enfoque requiere de menos recursos y tiempo para su implementación que otros enfoques, ventaja que lo hace atractivo de usar. En el presente trabajo se describe la aplicación de un enfoque de balance nutrimental para determinar recomendaciones de fertilización, para nitrógeno y fósforo en maíz de temporal en agrosistemas de la región de Nochixtlán, Oaxaca, y su comparación con un enfoque económico, tomado como referencia. La información usada corresponde a 82 siembras de maíz de agricultores bajo diferentes condiciones de suelo y clima. En cada siembra se determinaron: 1) la producción de grano y paja, 2) la extracción de nitrógeno y fósforo por el ...
AIP Conference Proceedings, 2013
ABSTRACT The present work is dedicates to illustrate how a computer algorithm based on the genera... more ABSTRACT The present work is dedicates to illustrate how a computer algorithm based on the generation of random numbers can be used successfully to simulate the grain structures presented in metallic materials. Here the random functions are programmed to create vertexes or nucleation nodes which can be growth, both algorithms are explained. Moreover the influence of these procedures on the grain size and morphology is also explained. After testing, the best fit was obtained simulating the two principal processes involved on grain formation (nucleation and growth) due to complex grain morphologies can be simulated creating columnar and equiaxed grains in two dimensional samples; and because this model allows to represent the grain formation dynamically as a function of time during solidification.
AIP Conference Proceedings, 2012
ABSTRACT This work is dedicated to analyze the heat removal phenomena during the simulation of th... more ABSTRACT This work is dedicated to analyze the heat removal phenomena during the simulation of the continuous casting process of the steel squared sections; it is a useful method to produce big mounts of steel and some other metals such as aluminum. Radiation, forced convection and thermal conduction are the physical phenomena involved. The method used to solve the heat removal and distribution is a finite difference. Steel is discretized using a regular squared mesh. Here a 3D problem is simplified to a 2D in which every node represents a 3D steel volume, but the assumptions are appropriately justified in order to reduce computing time without sacrifice precision on calculation. The efficiency of the method is also evaluated and alternatives to improve the approaching and results are commented.
International Journal of Minerals, Metallurgy, and Materials, 2012
International Journal of Minerals, Metallurgy, and Materials, 2012
International Journal of Minerals, Metallurgy, and Materials, 2010
Computational simulation is a very powerful tool to analyze industrial processes to reduce operat... more Computational simulation is a very powerful tool to analyze industrial processes to reduce operating risks and improve profits from equipment. The present work describes the development of some computational algorithms based on the numerical method to create a simulator for the continuous casting process, which is the most popular method to produce steel products for metallurgical industries. The kinematics of industrial processing was computationally reproduced using subroutines logically programmed. The cast steel by each strand was calculated using an iterative method nested in the main loop. The process was repeated at each time step (Δt) to calculate the casting time, simultaneously, the steel billets produced were counted and stored. The subroutines were used for creating a computational representation of a continuous casting plant (CCP) and displaying the simulation of the steel displacement through the CCP. These algorithms have been developed to create a simulator using the programming language C++. Algorithms for computer animation of the continuous casting process were created using a graphical user interface (GUI). Finally, the simulator functionality was shown and validated by comparing with the industrial information of the steel production of three casters.
International Journal of Minerals, Metallurgy, and Materials, 2010
The factors involved in simulating the continuous casting process of steel and the effects of the... more The factors involved in simulating the continuous casting process of steel and the effects of the factors on the thermal behavior were investigated. The numerical methods and the influence of some assumptions were also analyzed, such as nodes used to discretize the steel in array size and computing time to obtain good approaches. The results show that some of these factors are related with the design of the continuous casting plant (CCP), such as geometrical configuration, and the operating conditions, such as water flow rate, heat removal coefficient in the mold, casting times, and casting speed in the strand, which affect the heat removal conditions over the temperature and solidification profiles.
International Journal of Minerals, Metallurgy, and Materials, 2010
International Journal of Minerals, Metallurgy, and Materials, 2010
This work is focused on the development of computational algorithms to create a simulator for sol... more This work is focused on the development of computational algorithms to create a simulator for solving the heat transfer during the continuous casting process of steel. The temperatures and the solid shell thickness profiles were calculated and displayed on the screen for a billet through a defined continuous casting plant (CCP). The algorithms developed to calculate billet temperatures, involve the solutions of the corresponding equations for the heat removal conditions such as radiation, forced convection, and conduction according to the billet position through the CCP. This is done by a simultaneous comparison with the kinematics model previously developed. A finite difference method known as Crank-Nicholson is applied to solve the two-dimensional computational array (2D model). Enthalpy (H I,J ) and temperature (T I,J ) in every node are updated at each step time. The routines to display the results have been developed using a graphical user interface (GUI) in the programming language C++. Finally, the results obtained are compared with those of industrial trials for the surface temperature of three steel casters with different plant configurations in different casting conditions.
International Journal of Minerals, Metallurgy, and Materials, 2011
Computers & Chemical Engineering, 2014
TERRA, 1998
Proyecto académico sin fines de lucro, desarrollado bajo la iniciativa de acceso abierto
Uno de los enfoques utilizados para generar recomendaciones de fertilización para los cultivos es... more Uno de los enfoques utilizados para generar recomendaciones de fertilización para los cultivos es el de balance nutrimental, basado en que la dosis de fertilización depende de la demanda del nutrimento por el cultivo, el suministro del nutrimento por el suelo y la eficiencia de recuperación del nutrimento aplicado como fertilizante. Este enfoque requiere de menos recursos y tiempo para su implementación que otros enfoques, ventaja que lo hace atractivo de usar. En el presente trabajo se describe la aplicación de un enfoque de balance nutrimental para determinar recomendaciones de fertilización, para nitrógeno y fósforo en maíz de temporal en agrosistemas de la región de Nochixtlán, Oaxaca, y su comparación con un enfoque económico, tomado como referencia. La información usada corresponde a 82 siembras de maíz de agricultores bajo diferentes condiciones de suelo y clima. En cada siembra se determinaron: 1) la producción de grano y paja, 2) la extracción de nitrógeno y fósforo por el ...
AIP Conference Proceedings, 2013
ABSTRACT The present work is dedicates to illustrate how a computer algorithm based on the genera... more ABSTRACT The present work is dedicates to illustrate how a computer algorithm based on the generation of random numbers can be used successfully to simulate the grain structures presented in metallic materials. Here the random functions are programmed to create vertexes or nucleation nodes which can be growth, both algorithms are explained. Moreover the influence of these procedures on the grain size and morphology is also explained. After testing, the best fit was obtained simulating the two principal processes involved on grain formation (nucleation and growth) due to complex grain morphologies can be simulated creating columnar and equiaxed grains in two dimensional samples; and because this model allows to represent the grain formation dynamically as a function of time during solidification.
AIP Conference Proceedings, 2012
ABSTRACT This work is dedicated to analyze the heat removal phenomena during the simulation of th... more ABSTRACT This work is dedicated to analyze the heat removal phenomena during the simulation of the continuous casting process of the steel squared sections; it is a useful method to produce big mounts of steel and some other metals such as aluminum. Radiation, forced convection and thermal conduction are the physical phenomena involved. The method used to solve the heat removal and distribution is a finite difference. Steel is discretized using a regular squared mesh. Here a 3D problem is simplified to a 2D in which every node represents a 3D steel volume, but the assumptions are appropriately justified in order to reduce computing time without sacrifice precision on calculation. The efficiency of the method is also evaluated and alternatives to improve the approaching and results are commented.
International Journal of Minerals, Metallurgy, and Materials, 2012
International Journal of Minerals, Metallurgy, and Materials, 2012
International Journal of Minerals, Metallurgy, and Materials, 2010
Computational simulation is a very powerful tool to analyze industrial processes to reduce operat... more Computational simulation is a very powerful tool to analyze industrial processes to reduce operating risks and improve profits from equipment. The present work describes the development of some computational algorithms based on the numerical method to create a simulator for the continuous casting process, which is the most popular method to produce steel products for metallurgical industries. The kinematics of industrial processing was computationally reproduced using subroutines logically programmed. The cast steel by each strand was calculated using an iterative method nested in the main loop. The process was repeated at each time step (Δt) to calculate the casting time, simultaneously, the steel billets produced were counted and stored. The subroutines were used for creating a computational representation of a continuous casting plant (CCP) and displaying the simulation of the steel displacement through the CCP. These algorithms have been developed to create a simulator using the programming language C++. Algorithms for computer animation of the continuous casting process were created using a graphical user interface (GUI). Finally, the simulator functionality was shown and validated by comparing with the industrial information of the steel production of three casters.
International Journal of Minerals, Metallurgy, and Materials, 2010
The factors involved in simulating the continuous casting process of steel and the effects of the... more The factors involved in simulating the continuous casting process of steel and the effects of the factors on the thermal behavior were investigated. The numerical methods and the influence of some assumptions were also analyzed, such as nodes used to discretize the steel in array size and computing time to obtain good approaches. The results show that some of these factors are related with the design of the continuous casting plant (CCP), such as geometrical configuration, and the operating conditions, such as water flow rate, heat removal coefficient in the mold, casting times, and casting speed in the strand, which affect the heat removal conditions over the temperature and solidification profiles.
International Journal of Minerals, Metallurgy, and Materials, 2010
International Journal of Minerals, Metallurgy, and Materials, 2010
This work is focused on the development of computational algorithms to create a simulator for sol... more This work is focused on the development of computational algorithms to create a simulator for solving the heat transfer during the continuous casting process of steel. The temperatures and the solid shell thickness profiles were calculated and displayed on the screen for a billet through a defined continuous casting plant (CCP). The algorithms developed to calculate billet temperatures, involve the solutions of the corresponding equations for the heat removal conditions such as radiation, forced convection, and conduction according to the billet position through the CCP. This is done by a simultaneous comparison with the kinematics model previously developed. A finite difference method known as Crank-Nicholson is applied to solve the two-dimensional computational array (2D model). Enthalpy (H I,J ) and temperature (T I,J ) in every node are updated at each step time. The routines to display the results have been developed using a graphical user interface (GUI) in the programming language C++. Finally, the results obtained are compared with those of industrial trials for the surface temperature of three steel casters with different plant configurations in different casting conditions.
International Journal of Minerals, Metallurgy, and Materials, 2011
Computers & Chemical Engineering, 2014
TERRA, 1998
Proyecto académico sin fines de lucro, desarrollado bajo la iniciativa de acceso abierto