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1
artículo
In this research work, shell deformations generated by surface forces acting on the shell are described and simulated. The Naghdi and Koiter models are used to describe shell deformations. A weak formulation for the model is obtained, and some results on the existence of solutions are presented. The finite element method is then used to obtain the deformations. In addition, simulations of shell deformations are shown for the case of sectional curvature k = 0.
2
artículo
The simulation model is a useful assessment tool to analyze in depth evaluation of investment projects, improving investor decision making. Contributes to investigate new project ideas and help identify investment opportunities aimed at the reformulation of projects, adapting to the attitudes and investor requirements. An alternative choice is the mathematics expectation that is used in the calculation of probabilities that an event occurs. The fact that a good estimate of the elements involved in the calculation of profitability is not conducted, can lead to invalidate the analysis, and therefore, can lead to approve unprofitable projects and vice versa. When is known the probability of an event occurring certain number of years, usually applies a certain percentage during that period. For example, if the probability of an event occurring is 20 years, a rate of 5% per annum will apply.
3
artículo
The simulation model is a useful assessment tool to analyze in depth evaluation of investment projects, improving investor decision making. Contributes to investigate new project ideas and help identify investment opportunities aimed at the reformulation of projects, adapting to the attitudes and investor requirements. An alternative choice is the mathematics expectation that is used in the calculation of probabilities that an event occurs. The fact that a good estimate of the elements involved in the calculation of profitability is not conducted, can lead to invalidate the analysis, and therefore, can lead to approve unprofitable projects and vice versa. When is known the probability of an event occurring certain number of years, usually applies a certain percentage during that period. For example, if the probability of an event occurring is 20 years, a rate of 5% per annum will apply.
4
artículo
Publicado 2022
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Transfer of energy from large to small scales in turbulent flows is described as a flux of energy from small wave numbers to large wave numbers in the spectral representation of the Navier-Stokes equation. The problem of resolving the relevant scales in the flow corresponds in the spectral representation to determining the spectral truncation at large wave numbers. The effective number of degrees of freedom in the flow depends on the Reynolds number and a numerical simulation of the Navier Stokes equation for high Reynolds numbers is impractical without some sort of reduction of the number of degrees of freedom. The shell models are constructed to obey the same conservation laws and symmetries as the Navier Stokes equation as an alternative. In this work we present the Sabra shell model for the study of the energy cascade of turbulence and we will show numerically that the energy dissipa...
5
artículo
Publicado 2017
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The principles of this paper are about the problematic that many organizations have, in order to face unexpected events that were never experimented. Furthermore, how severe those events could be for the business continuity. Thus, this study searches for the relation between three concepts: Crisis Management, Live Simulation and Knowledge Management. For those reasons, it purposes to set a group of members from each organization into an experimental scenario that simulates an enterprise in crisis. The idea after the experiment is to accept or reject the usefulness of the simulation as a tool for Crisis Management, likewise, as a dynamic way to share and create knowledge. In order to firm the mission, several theories and assertions are presented -from different authors- in relation to concepts such as, human apprenticeship, crisis, crisis management, simulation, knowledge management and ...
6
artículo
The purpose of this research work is to present the flow diagram, material balance, equation statement and development of mathematical models that will allow us to predict final results such as: grades, recoveries and concentration radius that a mineral will report when it is processed by industrial scale flotation with information obtained from a batch of tests at the laboratory level, a method that can be applied to a wide variety of minerals and can be evaluated technically and economically with a high level of confidence.
7
artículo
Publicado 2005
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Over the last years, using phenomena models in interpreting and designing of software in metallurgical processes has been increasing. In this present research, a series of experimental test with polymetallic minerals is shown, which have been submitted to Flotation, Filtration, Leaching and Sedimentation processes. Mathematic modelling of such processes is shown, as well as the processing and simulation of the experimental data through the respective models. It is intended to contrast them with data from metallurgical plants for their respective validations. All these results will be used for a better planning and control of industrial variables in a concentrating plant.
8
artículo
Publicado 2005
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Over the last years, using phenomena models in interpreting and designing of software in metallurgical processes has been increasing. In this present research, a series of experimental test with polymetallic minerals is shown, which have been submitted to Flotation, Filtration, Leaching and Sedimentation processes. Mathematic modelling of such processes is shown, as well as the processing and simulation of the experimental data through the respective models. It is intended to contrast them with data from metallurgical plants for their respective validations. All these results will be used for a better planning and control of industrial variables in a concentrating plant.
9
tesis de grado
Publicado 2023
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La importancia de implementar un adecuado proceso de gestión de la demanda y el inventario mejora la coordinación en los modelos de cadena de suministro. El propósito de esta investigación es analizar y proponer la aplicación de una técnica de pronóstico y la implementación de una política de revisión continua de inventario mediante el diseño de una simulación para una empresa del sector comercial veterinario. Actualmente, las empresas sin esta coordinación obtienen un nivel de inventario inadecuado generando pérdidas en las utilidades y un bajo nivel de demanda de servicio. Este estudio presenta como resultado un modelo de optimización basado en la técnica ARIMA y un modelo de inventario simulado en el software Arena.
10
artículo
Publicado 2019
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The objective of the research was to estimate mathematical models for lead migration (μg/l) from a cellulose matrix using a neutral pH food simulant, taking two independent variables: total migration (mg/dm2 ) and the contact area (dm2 ), using multiple linear regression. The evaluated samples were two cellulose containers destined to the contact with food, being the origin of the cellulose from Chile and Brazil. Total and specific migration tests were carried out with the methodologies of Resolution No. 12 of MERCOSUR (1995) and method 3111 B of APHA (2005) respectively, under conditions of prolonged contact and at a temperature of 50 °C. The results of this research show that only the model for Brazilian pulp (Y = -55,864 – 0,304X1 + 9,173X2) was statistically adequate to make forecasts, with its correlation coefficient (R2) of 0,899. From the descriptive statistical analysis, the ...
11
artículo
Publicado 2019
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In this work three mathematical models of transmission lines are shown, the most used, to simulate electromagnetic transients in power systems. In addition, its main characteristics, advantages and disadvantages are mentioned. Likewise, the algorithms are shown in the form of flow charts for the simulations of the transients. Finally, the results of simulations of maneuvering surges in a single-phase transmission line using the MATLAB software are shown.
12
artículo
Publicado 2019
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In this work three mathematical models of transmission lines are shown, the most used, to simulate electromagnetic transients in power systems. In addition, its main characteristics, advantages and disadvantages are mentioned. Likewise, the algorithms are shown in the form of flow charts for the simulations of the transients. Finally, the results of simulations of maneuvering surges in a single-phase transmission line using the MATLAB software are shown.
13
artículo
Publicado 2025
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Soil organic carbon (SOC) sequestration in croplands represents a significant opportunity to mitigate climate change by removing carbon dioxide from the atmosphere. Simulation tools are increasingly used to assess the impact of climate change and soil management on soil organic carbon stock dynamics. Although Andean soils typically store large amounts of organic carbon, agricultural practices, especially plowing, may deplete these stocks, creating a need to understand these dynamics better. Here, we show the soil organic carbon sequestration potential in croplands in the Peruvian Andean region over 50 years. Soil organic carbon content and bulk density were spatially predicted across the study area using 100 georeferenced soil samples to quantify organic carbon stocks. Spatial interpolation was performed using Ordinary Kriging with exponential and spherical variogram models, which provid...
14
artículo
Publicado 2015
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This paper considers the proposal, development and numerical simulation of a system that models the behavior of the treatment of HIV-1 using antiretrovirals. The system defined for three dependent variables of the variable t, denoted by X(t)=(x1 (t), x2 (t), x3 (t)) represent the amount of T Lymphocytes "Helpers" (CD4), number of Cytotoxic T Lymphocytes (CD8) Viral load and infection process of HIV-1 at any time t, respectively. The assembly consists of a Nonlinear Ordinary Differential Equations system whose existential domain represents time system evaluation process of infection and viral clearance in a patient with HIV-1. This set of states of Nonlinear Dynamic System, associated with the initial value condition is called Cauchy problem. There are few studies related to the solution of this system, found some of the study are reduced to two variables and others without obtaining the ...
15
artículo
Publicado 2015
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This paper considers the proposal, development and numerical simulation of a system that models the behavior of the treatment of HIV-1 using antiretrovirals. The system defined for three dependent variables of the variable t, denoted by X(t)=(x1 (t), x2 (t), x3 (t)) represent the amount of T Lymphocytes "Helpers" (CD4), number of Cytotoxic T Lymphocytes (CD8) Viral load and infection process of HIV-1 at any time t, respectively. The assembly consists of a Nonlinear Ordinary Differential Equations system whose existential domain represents time system evaluation process of infection and viral clearance in a patient with HIV-1. This set of states of Nonlinear Dynamic System, associated with the initial value condition is called Cauchy problem. There are few studies related to the solution of this system, found some of the study are reduced to two variables and others without obtaining the ...
16
artículo
This work aims to simulate a bioreactor to produce ethanol from glucose using immobilized cells . First, we have proceeded to statistically evaluate the proposed kinetic models , from which we selected the model Aiba , Shoda and Nagathani [18 ] as the most appropriate model . Second, the values of the simulated fermentation have been validated by comparing the results with experimental data and Mutharasan Gencer [17 ] . Finally , the yield of ethanol production was simulated by considering a bioreactor of PFR type . The solution of the equations of material balance was done using Runge Kutta algorithm in Mathcad 7P IV . Comparison of simulated and experimental Mutharasan Gencer sample values appropriate arrangement .
17
artículo
This work aims to simulate a bioreactor to produce ethanol from glucose using immobilized cells . First, we have proceeded to statistically evaluate the proposed kinetic models , from which we selected the model Aiba , Shoda and Nagathani [18 ] as the most appropriate model . Second, the values of the simulated fermentation have been validated by comparing the results with experimental data and Mutharasan Gencer [17 ] . Finally , the yield of ethanol production was simulated by considering a bioreactor of PFR type . The solution of the equations of material balance was done using Runge Kutta algorithm in Mathcad 7P IV . Comparison of simulated and experimental Mutharasan Gencer sample values appropriate arrangement .
18
artículo
In this paper the simulation of separation systems LV ( G) for simple multistage multicomponent absorbers and absorbers with reboiler , where mixtures are considered ideal behavior and distillation processes is studied which mixtures can be considered ideal or not with behavior ideal. The simulation of such separation process is performed using the Newton -Raphson method numerical 2N . For non-ideal mixtures the activity coefficient is used in the liquid phase , which is evaluated from thermodynamic models : Wilson, NRTL , UNIQUAC and UNIFAC . In this paper the mathematical model and simulation program developed for the separation of these processes is described. A variety of examples have been used to test the functionality of the program. The results produced by the program are compared with those for the CHEMCAD III. It has also conducted sensitivity analysis for the initial temperatu...
19
artículo
In this paper the simulation of separation systems LV ( G) for simple multistage multicomponent absorbers and absorbers with reboiler , where mixtures are considered ideal behavior and distillation processes is studied which mixtures can be considered ideal or not with behavior ideal. The simulation of such separation process is performed using the Newton -Raphson method numerical 2N . For non-ideal mixtures the activity coefficient is used in the liquid phase , which is evaluated from thermodynamic models : Wilson, NRTL , UNIQUAC and UNIFAC . In this paper the mathematical model and simulation program developed for the separation of these processes is described. A variety of examples have been used to test the functionality of the program. The results produced by the program are compared with those for the CHEMCAD III. It has also conducted sensitivity analysis for the initial temperatu...
20
artículo
Publicado 2012
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The Instituto para el Depósito de Valores (INDEVAL) is the Central Securities Depository of Mexico. It is the only Mexican institution authorized to perform in an integrated manner the activities of safe-keeping custody management clearing settlement and transfer of securities. In this article we report the modeling simulation and analysis of a new Securities Settlement System (SSS) implemented by INDEVAL as part of a project for the implementation of a safer and more efficient operating system. The main objective of this research was to use reduced amounts of cash and securities within reasonable periods of time for the settlement of securities of the Mexican market. A linear programming model for the netting and clearing of operations was used. The performance of the new SSS was evaluated by performing experiments using a deterministic simulation model under different operation parame...
