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The present work shows the design of two simulations using free dynamic software that allows efficient modeling of the reflection, refraction and polarization of light. Specifically, the objective of the designed simulations is to verify computationally the laws of Snell and Malus, evaluating each one of the phenomena in an ideal way. These simulations were developed in GeoGebra computer software which allows the generation of dynamic designs referring to the nature and propagation of light. As a result, the numerical verification of each of the physical phenomena under study is shown, thus generating validity and reliability in the design of the simulations. [ABSTRACT FROM AUTHOR]

Nowadays, stock management became a strategic decision used by organizations due to the high impact it has on the overall performance of supply chains. This paper evaluates the impact of the implementation of a R, S inventory policy in the finances of a distribution network. The research involves the functioning of a hardware supply chain conformed by a retailer and a manufacturer, which is simulated trough system dynamics. The main results of the study validate the positive impact that the policy about network liquidity have. Likewise, it is possible to determine the dominance of parameters such as demand, the review period and the maximum production capacity over the overall performance of the system. [ABSTRACT FROM AUTHOR]

This article applies the Dynamic Simulation (DS) technique to the dynamic input-output model (DS/IO) designed by Johnson (1985 and 1986). The model is a generalization of the static input-output model (Leontief, 1941), with an additional emphasis on economic imbalance. The DS/IO consists of a system of 4n differential equations and 2n constraints. Therefore, attempts to model analytically are likely to be unsuccessful without numerical simulation. The DS/IO used data from the Mexican economy for calibration and validation. It was found that the dynamic multipliers are greater than the static multipliers due to the accelerator effect. The simulation of the DS/IO is also validated by the fact that the adjustment between current values and production projections from 2013 to 2019 is plausible. [ABSTRACT FROM AUTHOR]

Environmental risk management provides a preventive vision for socio-economic development in face of a changing climate. In this paper a technology for risk management at strategic and operational levels is proposed as essential support for decision-making to events of natural origin such as drought. The system dynamic simulation was carried out from the theoretical modeling of process; in addition, intelligent data mining techniques were used in the design of custom software. A technology that consists of a conceptual model, a continuous improvement procedure on environmentally sustainable bases and SIDecision computer platform, which centralizes management. Interpretations of statistical parameters demonstrate the quality achieved in decision-making regarding risk management for a case study in Cuban territory, after the technology has been implemented. [ABSTRACT FROM AUTHOR]

The objective of this work is to add value to the productive system of a food company in Mar del Plata. The problematic situation is structured and its main causes are detected by applying Soft Systems Methodology in combination with dynamic simulation to model the behavior of the productive system. The problem detected is the need to increase the production capacity to improve compliance with deliveries agreed with customers. A proposal for improvement in productive activities is presented that generates added value for the client and the organization and allows solving the current situation. A simulation software is used to model and compare the current and proposed production system. The results conclude that the improvement alternative exceeds the desired production levels, achieving an increase in the level of customer service. The proposal reduces waste by adding value and improving the competitiveness of the organization. [ABSTRACT FROM AUTHOR]

In this study, a reactive distillation column for production of isopropanol was investigated. Firstly, a dynamic model was developed for the process. The model of the process was then programmed, and the process simulated using a base case obtained from the literature. Results showed that distillate contained more than 58 mol% propylene-free isopropanol. In the next step, optimization of some operating variables was performed to maximize concentration of isopropanol in distillate with condenser temperature as constraint, which was considered to be above the freezing point of water. Several simulations were performed by changing operating parameters, and finally optimum isopropanol content in distillate was obtained above 58 mol%. Results of using classic controllers showed that PID controller had the best performance for both condenser temperature set-point tracking and disturbance rejection. [ABSTRACT FROM AUTHOR]

Based on dynamic thermal simulations with the EnergyPlus software, an experimental module of a rural dwelling is proposed for the village of Imata, Peru, at 4519 meters above sea level, with severe climatic conditions of very low temperatures. Simulations were carried out for five module configurations, successively adding bioclimatic components, such as improvements in the insulation of the enclosure, skylight and attached greenhouse. For the month with the lowest temperatures, the average temperature in the best configuration module is 11 °C higher than the average temperature in the module corresponding to typical Imata houses. The minimum average night temperature is 18.4 °C higher than the corresponding outside temperature (- 4 °C). To maintain a temperature of 16.3 °C inside the module (adaptive model), on annual average, a daily energy of 12 kWh is required for the typical module, and 1 kWh for the best design. [ABSTRACT FROM AUTHOR]

This article describes the design project of an animatronic of the Venezuelan dinosaur named Laquintasaura, which was developed from a selected concept taking into account the objective specifications derived from the needs of the client. It has a total of 9 degrees of freedom, operated by 8 mechanisms, which give the ability to perform the movements corresponding to the opening of the mouth, ascent and rotation of the head, movements of the neck, ascent and descent of the torso, rotation of the arms and movement of the tail. To design the animatronic, a structure was dimensioned, then a series of dynamic and kinematic simulations were carried out to evaluate the movements of the mechanisms, then the actuators that would execute the movements were selected. Additionally, an analysis of stresses using the Finite Element Method was applied to several mechanical elements to obtain a robust structure that meets the requested requirements. [ABSTRACT FROM AUTHOR]

In the majority of models, the protoplanetary disks have a continuous distribution of gas and dust, with a dynamics that gives origin to the planets, which in the process of formation, make grooves on the disk by gravitationally capturing the existing matter around them. Transition disks are a class of protoplanetary disk that has a large cavity free of gas and dust inside. In this paper we propose a statistical model based on transitional disks, which extends to protoplanetary disks. With this model you can perform dynamic simulations of planetary formation using few parameters. The process followed to simulate the transition disk DoAr44 and the protoplanetary disk Hl-Tauri is shown. Unlike other models, the formation of planetary bodies is faster. [ABSTRACT FROM AUTHOR]

This work presents a dynamic simulation of a Continuously Variable Transmission built-in with two planar mechanisms: a four-bar mechanism in the crank-rocker configuration and a crank-slider mechanism. Such mechanisms are the input and output subsystems of the system, respectively. In order to carry out dynamic simulation, the kinematic model of both subsystems is developed. Then, the method of Euler-Lagrange is used to obtain the whole dynamic model. Results of numerical simulations are presented, as well as a discussion about the CVT behavior obtained from the dynamic model in order to verify that the transmission fulfills the necessary conditions of the continuous variable transmission systems, is performed. This model will be used to develop the parametric design for this class of systems, when mechanical elements and control algorithms are integrated to obtain a mechatronics system. [ABSTRACT FROM AUTHOR]

This text presents a re-elaboration of the strategic planning of the mexican economy dynamic multisectorial model. The new version of the model involves a redefinition of three aspects. At the empirical level, the new national input output matrix forms the basis of information (INEGI, 2008). At the conceptual level, we incorporate a refinement of the behavior of the external sector, external debt and production. And, at the programming level, the computer simulation program is STELLA/IThink (9.0.1). As the model application we use the proposal of the federal government called "Program of Commercial Facilitation: A Structural Reform" (SE y SHCP, 2008), which aims to maintain the competitiveness of the industrial sector within a stage of total openness to all countries. [ABSTRACT FROM AUTHOR]

Today, in our country, enterprises face big challenges from a fierce competition, not only internal, also international, which operate with better conditions than ours. It is time to take advantages from scientific, technological and computing progresses like simulation, to be included by the management of organization, known as complex and dynamic systems. The operating manager for a wood enterprise likes the possibility to abate costs. His concern about the amount of compressed board stored and pretends to spend as little as possible on the transportation from the processing plants to the sales shops. An operating policy is built towards the costs reduction, working on three linked steps: transport, assuming that there are no problems with existence; warehouse inventory where the estimated demand derives from the results of the transportation item; and the distribution-inventory, solved by drawing a simulation model which uses initial values, the results of the previous items. The model refers to using tools from Linear Programming, Inventory theory and Dynamic Simulation. The costs generated with this analysis are smaller to those obtained without control on the system, 18.23 % on average. A recurrent solving method is contributed. [ABSTRACT FROM AUTHOR]

The design and evaluation of several configurations of evaporative cooling systems for air conditioning of a dwelling for low-income sectors in Mexicali, Mexico using simulation with TRNSYS 16.A is presented in this paper. The configurations studied include direct as well as indirect evaporative cooling with heat exchange and also systems with solid desiccant. The main rating parameters to classify the different configurations are the internal comfort conditions, the efficiency and the number of required equipments. The results show that the best configuration is one that includes a heat exchanger that pre-cools the air inlet stream with a cooling stream delivered by air coming from the dwell, but there is a small fraction of the time during the day that comfort is not met. If thermal comfort is to be met during the whole day, solid desiccant systems are the best choice. [ABSTRACT FROM AUTHOR]

This article shows the systematic design of a prototype for the knee therapy using integrated concepts of different engineering areas like Automatics, Mechanics, Electronics and Medicine. This design provides a cheap solution to undertake knee therapies. During the design process Computer Aided Design (CAD) and Dynamic Simulation (DS) tools were used in order to ease the prototype construction. An analytic model was obtained and it was compared with the dynamic simulation results to validate the computational models. Finally, a prototype including its power system and control was designed and constructed. [ABSTRACT FROM AUTHOR]